rcDEN
L
SERVICEMANUAL MARINERADAR
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II
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562 93841
7
tI PRECAIITIONS
1. HIGH VOLTAGEWARNING At several points in the scanner unit and dlsplay CRT mount of the radar, there are high voltages enough to ki11 a person coming into direct contact with thern. Although the equlpment 1s designed to avoid danger in ordinary operation, care should be taken during the maintenance works inside the units. Turn off the shiprs main swiLch when checking the circuits or replacing components. Even after the radar is switched off, some capacitors may take several minutes Lo discharge. Before touching the magnetron and/or CRT HV circuits, make sure to ground the capacitors with a clip cord or the 1lke.
2. MICROWAVE HAZARI) Take care to avoid possible harmful effects of mi-crowave radiation valnerfrom the radar to a human body. The eyes are particularly able to microwave. Never look directly into an open waveguide radiating can upset some the power. Radar and other R.F. radiations cardiac pacemakers. If a user of cardiac pacemaker suspects a mu1function, of Lhe anturn off the equipment and leave the vicinity tenna irnmediately. Whenever it is necessary to work on the scanner unit, always set the controls t o S T A N D B Yo r R A D A RO F F .
3. FI]SES Before starting raLed main fuses the radar, confirm that properly according to the ship's main voltage are used. The rated maln and other fuses for MD-3210 and MD-3220 are listed below.
Ship's Main
I'tD-32r0
tfi-3220
(a) Main fuse
T2 VDC 24 VDC
1 5 A 8 A
Not applicable 1 0 A
( b ) C R TH V ( S e e N o t e )
Either
1 l-
(c) Modulator HV
Either
0.3 A
(d) Antenna drive motor
Either
?
J .
1 < L J
A tl
A
N
i A 0.5 A 3 . 1 5A
4. MAGNETRON PREHEATING Before transmitting the microwave for the first transmission after preheat installatlon, or after 2 months or over pause of operation, the magnetron more than 30 minutes by keeping the radar in STANDBY condition. Note:
CRT HV fuse is be1ow, equipped
not used for the unit of serial numbers shown p o w e r with supply I'{D-32I0/3220-6000M3.
MD-3210: No. 2100659 and thereafter MD-3220: No. 3220336 and thereafter
M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - O l
.\:
Marine Radar MD-3210/ SZZO INDEX Page IONS PRECAUT 1. GENERAL 1.1 Major Performances 1 . 1 . 1 A n L e n n au n i t 1.I.2 Display unit 1.1 .3 Power supply 1.2 Composition
l-i I-2 I-2 1-3
....
r . 2 . 1M D - 3 2 r 0 / 3 2 2 0
t
II lf
-
-,J
....
...... r-4
1-5 I.2.2 Optional equipment 1-6 .... 1 . 3 S y s t e mC o n f i g u r a t i o n o f M D - 3 2 I 0 / 3 2 2 0 I -7 M D 3 2 I 0 1 3 2 2 0 I.4 InterconnecLion of 1.5 Modification of Speclfications 1-8 1 . 5 . 1 J u m p e rp i n s e t t i n g 1-B L.5.2 DIP switch setting 2. FUNCTIONOF EACHUNIT 2-I .. .. 2 . I A n t e n n aU n i t 2-I 2 . f . 1 A e ri a 1 2-2 2 , I , 2 A n t e n n an o t o r 2 -2 .,.. 2 . I . 3 S H Fa n d A Z I g e n e r a t o r s 2-3 2.I.4 Transmitting section 2-5 2.I.5 Duplexingassembly 2-5 2.I .6 Receiving sectj-on 2-l 2.2 Dlsplay Unit 2-7 2 . 2 . 1 P o w e r s u p p l y ( M D - 3 21 0 / 3 2 2 0 - 6 0 0 0) . . .2-9 .... 2.2.2 Logic section 2-9 ( i ) L o g i c u p p e r ( M D - 3 2 1 0 - 7 0 0 0.). . . . . 2 -L3 (2) Logic lower (MD-3210-7100) 2-I8 .... .... 2.2.3 Control panel (MD-3210-7200) 3. ADJUST]'{ENT .......... 3-i .... 3 . 1 L o c a t i o no f C o n t r o l s 3-l 3 . 2 A dj u s t r n e n t A f t e r I n s t a l l a l i o n 3-1 3.2.1 Tuning ........ . 3-2 3 , 2 . 2 P r e s e t g a i n ( n o i s e 1 e v e 1 ). . . . 3-2 . . . . , . . . 3.2.3STC 3 -z .. .. . 3 . 2 . 4 T r i - g g e rd e l a y 3-3 ............ 3 . 2 . 5 S H Fa n d b e a r i n g. . . . 3-3 3.3 Adjustment of Antenna Unit 3.4 Adjustrnent of Display .... 3-3 3 . 4 . 1 P o w e r s u p p l y ( M D - 3 2 L 0 / 3 2 2 0 - 6 0 0 0. ). 3-5 3.4.2 Logic upper (MD-3210-7000) .... 3-5 3 . 4 . 3 l o g i c l o w e r ( M D - 3 2 i 0 - 7 1 0 0. .). . . . . . . . . . 3-6 3 . 4 . 4 C R Tu n i t ( P \ ^ / D - i 0 5 0 A / P W D - 1 0 5 1 A )
1 -
4. WAVEFORMS 4.I AntennaUnit 4 . t . 1 M R T - 1 3 (3M D - 3 2 1 0 ) .... ........ 4.L.2 mT-134 (MD-3220) 4.2 Display unit 4.2.1 Powersupply 4.2.2 Logic upper 4.2.3 Logic lower OF MAJORCOMPONENTS 5. REPLACEMENT 5.1 Antenna unit 5.1.1 Dismounting transmitler/receiver (TR) unit 5 . I . 2 R e p l a c e m e n to f T R u n i t c o m p o n e n t s 5 . 1 . 3 R e p l a c e m e notf S C O N. . . . . .. . .. . .. ... 5 . 1 . 4 R e p l a c e m e n to f m o t o r b r u s h 5 . 1 . 5 R e p l a c e m e n to f m o t o r 5.2 Display unlt 5 . 2 . 1 C o n t r o l p a n e l ( M D - 3 2 1 0 - 7 2 0 0 .) . ) nd 5.2.2 Logic upper (MD-3210-7000a logic lower (MD-3210-7100) 5 . 2 . 3 P o w e r s u p p l y ( M D - 3 2 1 0 1 3 2 2 0 - 6 0 0 0. ). 5 . 2 . 4 C R Tu n i t 6. TROUBLESHOOTING 6.I Troubleshooting by Observing Display 6.2 Operation Control Troubleshooting .... 6 . 3 A n t e n n aT r o u b l e s h o o t i n g ........ ....... 7. DIAGRAMS 7.L Circuit Diagram ... ... ... . .. 7,2 Drawings for parts location 8 . P A R T SL I S T 8.1 Electrical Parts 8 . 1 . 1 A n r e n n a u n i r M R T - 1 3 3( 1 0 k W ) 8 . I . 2 A n t e n n a u n i t M R T - 1 3 4( 2 5 k W ) 8 . 1 . 3 D i _ s p l a yu n i r M R D - 6 2 / M R D - 6 8 ........... 8.2 Mechanical Parts 8 . 2 . 1 A n t e n n a u n i t M R T - 1 3 3( 1 0 k W ) . . o . 8.2.2 Anlenna unir I'&T-r34 Q5 kW) .... 8.2.3 Display unir MRD-62/MRO-OS 8.3 ExplodedView 8 . 3 . 1 A n t e n n au n i t 8.3.2 Display unit
: f J + J f * * * * : f * : f *
2
4-I 4-3 4-4 +-J
4-5 J_L
<
t
J - L J_L
5-4 )-+ J-+
5-6 -
a
) - l
5-8 6-1 6-1 6-4 6-7 -7 t - I
1
/ -/-4
I
8-1 8-8 8-18 8-28 8-3 1 8-32
8-3s 8-42
SERVICEMANUAL for MARINE RADAR MD_3210 / 3220
1.
GENERAL Koden MD-32L0/3220 series is a highly efficient marine radar which conform Lhe IMO standards Lo be used for a primary radar of fishing boal, workboal, and other vessel less than 10,000 gross weight Lons. The syslem consists of only two units, i.e. the anLenna and display. Excepl for magnetron and CRT, all Lhe active componenls are solid state which maintain high reliabiliLy and mainLenabilitv. The radar display uses a 20-inch diagonal high resolution green monochrome CRT. It employs X-Y coordinates process the radar information to digitally and diqnlav Lhe image with a built-in microprocessor. The radar screen is divlded into number of picture elemenls, so ca1led pixels. Each pixel is assigned wilh X-Y coordinates which corresponds to Lhe memory address. The radar return echoes in polar coordinates for every pulse Lransmission are converLed inlo X-Y coordinates i-n accordance wiLh Lhe distance and azimuth. The distance is oblained from the time duralion between transmission and recepllon of pulse, while the azimuth is given from the antenna unil. The coordinates converted dala is stored inLo memory and Lhen read oul to display Lhe irnage in a raster scan melhod allowing the picLure to be monitored by p1ura1 persons under daylight condiLion without viewing hood. According to the LransrnitLing power, system is classified into Lwo models as be1ow.
M D - 3 201 MD-3220 Antenna
ar^'l
10 kl,J 25 kW
unit
Antenna uniL consj-sls of a 6-fool sloLted array aerial, antenna drlve unil, and transceiver unlt. The slotted array aerial is contained in a reinforced plastic cylindrical case, providing smooth anfenna rotation in a wind load of 100 knots. The antenna unit has been designed as \','aLer-Light, vibration-proof, and weather-reslstant construction. The drive unil and Lransceiver unit are mounLed in a rigid alurninum cast anLenna base. The Lransceiver uniL is a module Lype whlch enables speedy a n d e a s v m ai n L e n a n c e. Dis pla y
unit
The radar picture is displayed on a 2O-inch diagonal high resolution CRT wilh an effecLive diameLer of 12 inches (270 mm). The green mono-color raster p i c L u r e presents crisp and clear irnage under bright daylight scan condition. The display unit mainly consisls of CRT mount, logic circuil, control, and power supply sections, all assembled Logether in a dripproof aluminum case. Each section is of a rnodule type providing easy malnLenance capability. In addition to presentaLion, Lhe radar the ^ ^ - i + . i^ - . i e q u i p m e n l s u c h a s G P S, a n d P U > a L r U l l r . ng daLa f rom an onboard navigational Locan C can be digilally displayed on Lhe screen.
MD-32L0 / 3220 Service Manual-Ol
1-1
1.1
Major
1.1.1 (1)
Performances
Antenna unit Antenna system Aerial
MRA-37
Transceiver
M R T - 1 3 3( M D - 3 2 1 0 ) M R T - 1 3 4( M D - 3 2 2 0 )
(2) Aerial
6-foot
(3)
Antenna rotation
24 rpm
(4)
Ivlaln beam width
Horl zonLaT: 1.2" , Vertical:
(5)
Sidelobe 1eve1
Less than -23 dB from the maln beam
(6)
Transmilting
9 ,4rO t30 MHz
(7)
Peak power output
(B) Type of (9)
Spurious
array
22"
10 k\,./(MRT-I33) 25 kW (MRT-134) PON
enission
( 10) 0ccupied (11)
frequency
slotted
ernission
Less than -40 dB from the main beam of the fundamental frequency outpuL
bandwidth
Within
Pulse width/repetition
110 NIHz
rate
S M1 M2 L
0.08 Usec, 2,000 pps 0.3 Usec, 1,500 pps 0.6 usec, 1,000 pps I.2 usec, 500 pps (Unf-l33/134) 4 3 0 p p s ( M R T - 1 3 4a L 9 6 n m r a n o e )
(12) IF center frequency
60 Yfri,z
( 1 3 ) IF bandwidth
1 5 N I H z( S , M i ) 3 Yfrlz (V12, L)
(14) Receiver front-end
module
( 15) Modulator
M I C ( M i c r o r v a v eI n L e g r a L e d C i r c u i L ) Solid-state
( 16) Environmental
11ne Lype pulser
conditions
Ambient temperature Relative humidity Wind velocitv
-250C ro 70'C 957"at 35oC 100 knots (51.5 m/sec), relative
I.L.2 Display unit (1) Display system
20-inch diagonal
green monochrome CRT
MRD_62( I'D-3210) MRD_68 (2)
Effective
(3)
Range scale
diameter
270
MRD-62(MD-3210) L /4 , r / 2 , 3 / 4 , 1 . 5 , 3 , 6 , 1 2 , 2 4 , 4 8 , 7 2 n m MRD-68(MD-3220) r / 4 , r / 2 , 3 / 4 , 1 . 5 , 3 , 6 , 1 2 , 24, 48, 96 nm
1
L-Z-
t
M D - 3 2 I 0/ 3 2 2 0 S e r v i c e M a n u a l - O l
(4)
Range ring
interval
M R D - 6 2( M D - 3 2 1 0 ) r / 1 6 , r / 8 , r / 8 , r / 4 , r / 2 , 1 , 2 , 4 , 8 , 1 2 n m M R D - 6 8( M D - 3 2 2 0 ) L / 1 6 , r / 8 , r / 8 , L / 4 , r / 2 , 1 , 2 , 4 , B , 1 6 n m (5) Min. detection range
Better than 23 m on I/4 nm range
(6) Range resolution
Better than 20 m
( 7 ) V R Ma c c u r a c y
5 0 m o r 1 7 .o f t h e s e l e c t e d r a n g e , w h i c h e v e r is the greater
(S) EBL
Accuracy 1o, in 0.2" steps rotation
(9) Bearing resolution
1.8o
( 10) Bearing scal .
Marking Read-out
(ll)
Environmental conditions Temperature Relative humidity
(I2)
1o, 5o, 10" steps (0' to 359') 10o steps
Rotary switch
-15"C to 55oC 9 5 7 "a t 3 5 " C (S'BY, SP, LP, PM) FUNCTION
(13) Rotary encoder
VRM,EBL
(14) Operatioal controls
BRILL, T U N E , G A I N , S T C , F T C , V I D E OB R I L L , M A R K E R BRILL, and track ball P L O TB R I L L , N U M E R I C
( 1 5) M e m b r a n es w i t c h
R A N G E ,D I M , H M , R I N G S , M O D E( H U , C U , E B L, P O \ , , / ,E R N U , T M ), G Y R O ,S P D , T R , E X P, B E A R I N G ,T R A I L ( O F F, 1 5 , 3 0 s e c , 1 , 3 , 6 , 1 2 m i n ) , A L A R M( O F F , 9 0 o , 1 8 0 o , 3 6 0 o ) , S E T ( G Y R O ,A L A R M ) ,O F F C T R , F L T E B L , VECTOR,TRU/REL, DELETE, ALL CLR, ENTER , SYMBOL
( o, [], A, V, O, *)
( 16) Presentation mode
Head-up North-up (option, see Note 1) Course-up (option, see Note 1) T r u e m o t i o n ( o p t i o n , s e e N o t e 1)
Note 1: North-up, course-up, and true motion modesrequire built-in t i o n a l g y r o/ I o g i n t e r f a c e K S A - 0 8 . 1.1.3
type op-
Power supply
(1) Power requirements MD-3210
MD-3220
1 i r o 1 8 V D Co r 2 L L o 3 6 V D C ( S e e N o r e 2 ) N o t e 2 ; l ' 1 D * 3 2 1 0o p e r a l e s o n 2 4 l Z Z V D C m a i n s a s t h e standard. For operation on 12 VDC, change taps of the power transformer in the power supplv MD-32r0/ 3220-6000 ' 24 VDC
(2) Power consumption
MD-3210 MD-3220
140 l{ at 24 VDC 1 6 0W
M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - O 1
1-3
L.2
Composition
L .2.1
MD-32IO/3220
( 1) Standard equiprnent list
No.
Descriuption
1
Aerial
2
Transceiver Dslplay
unit
unit
4
Vinyl
5
Connecting
6
Power cable
-,
Rating
Renarks
Weight/Length
span
B k g ( 1 7. 6 l b )
1
Q'ty
MRA_37
6-foot
MRT_133 MRT_134
For MD-3210 For MD-322O
77 kg (37.s lb) 2 0 k g ( 4 4 . o 1 b)
1 1
MRD_62 MRD_68
For MD-3210 For MD-3220
37 kg (81.4 1b) 37 kg (81.4 1b)
1 1
For display unit
cover cable
1
9CD-3292C CW_89
15
( 4 9. 5 f r )
t
5
( 1 6 . sf r )
1
250V-DPY2.O 8 . 5 m m0 , w i t h o n e end connector
Spare parts
See spare parts list
1
SCL
8
Installation materials
See installation maLerial list
1
J C L
9
Operation
a n { -
manual
1
(2) Spare parts l1st No.
Description
Rating
Use
PID-3210
|
m4220
Q'ty
I
Not applicable
2
1
Fuse, main
ls A
(F-716s)
For 12 VDC
2
Fuse, main
8 A 10 A
(F-716s) (F-7165)
For 24 VDC I Not applicable Not applj-cab1e 24 VDC lFor For 10 kW TX I not applicable Not applicable For 25 kW TX I For MD-32I0/3220, see Note
F u s e , M O DH V 0 . 3 A
0.s A 4 J
6 -l
Fuse, CRT HV 1 A
(F-7165) (F-716s) (F-7r42)
Z
2 2 2 z
Fuse, motor
3 . 1 s A ( T L C 3 . 1 s A )For antenna, lulD-32I0/3220
L
Lamp
KCDS_05
For control
L
Molor brush
242125209
For antenna motor, MD-32I0/3220 I set
panel, MD-32I0/3220
Note CRTHV fuse is not applied for the serial numbers shown be1ow, equipped wirh power supply I'lD-32I0/3220-6000M3. M D - 3 2 1 0 : N o . 2 1 0 0 6 5 9a n d r h e r e a f r e r V I D - 3 2 2 0 :N o. 3 2 2 0 3 3 6 a n d r h e r e a f r e r
L-4
M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - O 1
-
(3)
Installation
material
list
Rating
Description
No.
Use
Q'ty
I
Coach screw Plain washer Spring washer
CW9x 50S W 1O S SWlOS
For display unit
6 6 6
z
Hexagonal bolt Plain washer Spring washer NUL
BLz x 55U
For antenna unit
4
J
I .2.2
2\]IzU sh/12u N1 2 U
Anti-corrosion washer
30
Anti-corrosion washer
50
Optional
a
Rating
1
Gyro/Log interface
KSA_OB
I
Hood
HD-1100
Base
0 019 - r 2 r 9
4
Rectifier
PS-00s
5
Navigator ing cable
-)
For antenna
unit
4
For antenna
unit
4
equipment
Description
No.
B 4 B
connect-
Built-in
Remarks
Weight/Length
type
kg (2.2 1b)
Bulkhead mounting 8 kg (17.6 1b)
CW-94
With BNC/6-pln plugs
5 m (16.5 ft)
CW_i53A
With 6-pin plugs
5 m
cl,\I-155
With BNC/6-pin plugs
5 m
MD-32I0/3220 Service Manual-01
t \ L-J
1. 3
System Configuration
of I'[D-3210/ ZZZO
Antenna Unit Aerial MRA-37 6-foot
T ra n s c e i v e r l'tRT-r33 (t'tD-3210) t"tRT-134(lrD-3220)
Antenna cable 9CD-3292A t0 9CD-32928 20 9CD-3292C 1s 9CD-3292D 2L
m m m, standard t o 4 0 m
D i s p l a y Unit l"{RD-62 (r'fD-32r0) MRD-68 (t'tD-3220) From NavigaLor (opt ion) -l I
Gyro-1og Interface
: - - -l *ro-ou -::: ff;'=il::i' fJ _:::: Log signal --
l----;(BuilL in the display unit)
-
to 4o vDC
tl
Power cable
ct.J-89 1 l ro 18, 2t ro 36 V D C (MD -3210) 24 VDC !tO7" (t{t-322o)
Rectifier
----- -l ps-oosl- r
l
,
I
I
r
100/1L5/2oo/230vAC Dotted lines---
Antenna Unit
Model A e ri a l
1-6
show option.
Display Unit
Transcei ver
I'lD-3210
MRA_37
MRT_133
I'[RD-62
t{D'-3220
I'[RA-37
l,tRT-134
I'{RD-68
M D - 3 2I O/ 3 2 2 0 S e r v i c e M a n u a l - O l
Interconnection
I.4
of MD-321O/322O
Wire Color VIOtff
ANTENNAIINIT
BRorrN r J----rr--!rl---4
1}.b.-l
'€
i4'-"-ll ll I SCANNERCONNECTION BOARDr--
(s coN)
'T.?ff pt
, . , x r . , xl L ) (f_|d
o
I
r[r> ;'
ffi
I r
.rsn*: tSQ'E^l ' | t * | | 'O ru-t
$'q{ nP clamP
Cable
wire ends lnto Insert terminals and fix them rviLh a screw driver. Anttlntra
Lef t
t
Green I \Jhire BTdCK BOLD:Thick wire PINK Lighr: Thin wire Vi o l e t h l h i t e / g r e en Gray GREEN BLT]E No connecLion No connecLion \Vhire/red Y e1 1 o r i Brorvn Coax. GND RED 0range Red GRAY Coax. GND Ri ght
I
cable
) 292 9CL)--
KSA-Os-6200 Synchro 14
DISPT-AYTJNIT
Q l
s2
Lype Gyro
s2
qa
R1 R2 coM GND LOGl LOC2 LOG3 LOG4
Step type G1'ro
Qr
qa R1 ru C'M GND
Contact type log Photo-coupler type log
See para. | .5.2 DIP for selting suiLch Lo select Lype of Gyro.
I /i\ (z+,
)< \1,
or v D C( M D - 3 2 r 0 ) !to7" (l,tD-3220)
Signal Shield C W - 1 5 5o r
24 V D C
Ship's mains 100/l 15/200/230 vAc
Rectifier PS-005 (option)
MD-32I0/3220 Service Manual-Ol
L-7
r.4
Interconnection
of MD-321O/3220
LCL
ANTENNAI.INIT
5,l-li'
i.l
e ,
G;ffi,
J-------r.:--!r-L--4
I ik -u; I
SCANNERC0NNECTION BOARDr--
.FF -lc
lI[-J :rf-.r*.r.
ir
(s coN) gg' -
lt-) l'o
ll'r) -g,_^ -=
3l*
-]
Fd,ffi ,-ff1*Y'*1
Cable
Wire Color VIOI-ET BRCft'lN Green I \{hi re BLACK BOLD:T h i c k w i r e PII{K . I i o h t Thin wire Viol et llhi tel green Gray GREE}I BLTIE No connecLion No connecLion \Vhire/red Y e1 1 o r , ' Brorvn Coax. GND RED 0range Red GRAY I Coax. GND Right
r I
clamP
Insert wlre ends into terminals and fix them with a screw driver.
L
Antrlrrrra cable
9C t)--t2 9 2
KSA-O5-6200 Synchro I4
DTSPI-AY TINIT
S1 S2
type G;'ro qr
Step type G yr o
S2
qa JJ
R1
R1
n<
ru
coM
@M
GND LOGl LOG2 LOG3 LOG4
GNO
Contact type 1og P h o t o - c o up l e r type 1og
Seepara. I .5.2 for setting DIP swiLch to select rype of Gyro.
f?^;3u,;"i;;"@ E ffi[l] ;3.3;;,Tiir; @a ffi[1] e) Signal )< t)
Power cable
c\V-89
Shield
C r i -1 5 5
24 VDC
(*-) ll to lB or 2I Lo 36 VDC(MD-3210) 2 4 V D Ct 1 0 Z ( t ' t D - 3 2 2 0 )
Ship's mains 100/l rs/200/230 vAc
Rectifier PS-005 (option)
MD-32I0 / 3220 Service Manual-0l
t-7
I .5
M odif ic ati o n
1 . 5. I
of
J um p e r p i n
S p e c i fi c a ti o n s
s e tti n g
fn order to set operational conditions of the unit, flve jumper pins are provided on the logic lower board (MD-3210-7100).Functions and initial setting status of those pins are listed as follows:
1.5.2
Jarper Pin llo.
Function
JP1
Level of plottins image
ll: 3rd and 4th levei of quantized 4-level videosignal are plotted.
H : 0 n 1 yt h e h i g h e s t (4th) level video signal is plotted.
JP2
Selectionof trigger
OFF:Internal
Olf: External
JP3
C o m p o s i t i oonf v i d e o s i e EX0R:Video signal lf0Rll:Video signal n a l a n dm a r k e ri i n e s ( E B L , i e v e l b e c o m e[s1 o w ] and markerI ines VRM,SHF',and fixed range wheremarkerlines are superirnposed. markerrings) ride on.
JP4
Statusof output video
Ml{: Rawvideo
JP5
Number of horizontai scanning iines
1 , 1 5 3 :F o r 2 0 - i n C R T 1 , 0 8 9 :F o r 1 5 - i n C R T
I nitial settins
Modification
PR0:Videosignal processed on STC, FTC,andgain
DIP switch setting T h r e e D I P s w i t c h e s , f r o m S W l t o S W 3a r e m o u n t e d o n t h e l o g i c u p p e r b o a r d ( M D - 3 2 1 0 - 7 0 0 0 )i n o r d e r L o p r e s e L t h e o p e r a L i o n o f e q u i p m e n t . F u n c t i o n s set by those switches and their standard settings are listed below.
SH1 Elerent
Function
lfo. 1 I
2
1-B
Input data format
oN-r NMEA_ OFF_-l KODEN-0N r NMEA- OIF1 No O N J 0i83
0N r 7r7
J 0182 OFF
','200. 0N -l 400 6Xp:1,.
QlPr
-l OFF I OFF
isp*t
3 4
Speedlog p u l s er a t i o
100 0 NI 0Nr
5
Bearingdata
0 N : S e r i a l ( L o r a n ,G P S )
6
Gyrodata
0N: Connected for NU,CU,or TM 0IF::::Not [611xsc[sfl
7 8
GyroBOar ratio
0 NI 3 6 : 1 0Nr
fllrf J
OF_ F1 9 0 : 1 ON-J
-J OFF
500
QIP;::P6sa1,le:I : (XSA-08)
0N I 180:1 OFF'I
IO/ 3220 Service Manual-O1 t"lD-32
DIP switch setting,
continue
sHz
Elenent l{o.
Function
1
Rangesetting
ON: ,
2 3
Maximum range
_1 Not 0 N t 6 4 n m OFF I _J used OFF OFF
u t
4 , B nmseries
0F8,1.,,,3.,,, 0,;,.,.12.,.qil:,:S,elle-$i
,0t+1" ,72;.,*,, 0rr,;,.,96,;p. ONr':
:
MD-3210 4 q
6 7 8
EXPeffect range 0N: Above3 or 4 nmrange Trail mode
0N;::[ateSt: four:traCks
T r a i l s a m p l i n g 0N: Everyantennarotation VRMunit
Qlif J
t4D-3220
AII O F F :C o n t i n u e all tracks
g.rvaI s.,. y.,.hp. sg-t,.,,h QF.E, i,,,,.l.Q-t -
0N: km/hour
Nautlcalmile
Performance monitorl Oll: Connected
sH3
Elenent lfo.
Function
1
Notused.
,
Notused.
u
3
Speeddata
4
Off-centering mode
5
P a r a1l e l curs0r
dd,..,. Q[I, ;,.,,0. 1.Iy.,,E8,[-,., i .q,. d,i ! p1-a.y
Wavpoint
0 N : D i s p l a yW P( w a y p o i n t )
A
0 N : S e r i a l ( L o r a n ,G P S )
1.,.(K$4.:0S ,,,P_aral,le ):,.
0f!1 Mqve213radiusto stern 0[{,;,,,,M0ye..t0: ,with,,,iurSoi', :ant,.,p-o,in!,. Ui[.h,ilf.i,rl3,:,iadi,us, 0 N : P a r a l l e l c u r s o ra n d E B La r e s e l e c t i v e l yd i s p l a v e d
7
CRT size
jumperpin JpSmustbe 0N, 15" Note)MD-3210-7100 0F_{ii.,.,2(!.]:'i set to 1,089for 15" b. t,fSS for 20" CRT.
B
Resettine true motion di splay center
0N: Sweep 0rrgrnreturnsscopecenterwhentraveiled tq \'!P- 213radiusahead. ':.: oi,igin,,' i'S'.:iet :':2rc"iadius,'of OIF::: :$weep: f :fism:'Scope: ',,,,,,, ,-,-,coR-!Qf
M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - O 1
r-9
2. FI]NCTION OF EACH T]NIT 2. L
A nt e n n a U n i t antenna drlve mechaarray aerial, The antenna unit consists of the slotted assembly. The transmitter receiver, and T/R switching nism, transrnitter, with HT supply and trigger consists of the magnetron and modulator circuit Fig.2.1 illustrates amplifier. the block diagram of the antenna unit, and Table 2.I lists the composition of antenna unit. AeriaL S HF G e n . Dnf
:
nrr
Motor
Jo'int
Fig. 2.I Block Diagram of Antenna Unit
(s c0N)
A ZI G e n .
1 4 a g n er to n ircuIator' HT Supply & ModuLator
Table 2.I
I F Amp.
L'imiter'
Composition
N o . Description
of Antenna Unit Part No.
Function
t[RT-133 1 Aerial
Scanner Connection
RF emission tion
Motor with
rotation Aerail and AZI pulse generation
23G53203
23G53203
HT supply and pulse modulation
239U522368 ( 10 k1,{)
229U25361. (25 k\,\/)
5 Magnetron
X-band RF oscillation
MSF1 4258
E3564A
6 Circulator
RF sigal
FCX6B
FCX68
NJS6930
S_LX17
NJT1946
S_RX34
239U52512
239U52512
Modulator
'7
L i mi te r
B MIC
r '
MRA_37 (6-ft )
^ r
ni ni nn
r
MRA-37 (6-fr ) FRS-901-3
SHF generator
L
I
and recep-
I'[RT-134
Ship's heading flash generation
duplexing
Protection
of
receiver
RF amplification and frequency conversion
9 L o g IF a m p L o g a r i t h m i c
IF amplific-ation and detection
FRS-901-3
2.I .I Aerial The antenna unils of MD-3210 and MD-3220 are respectively provided with a 6-foot aerial for transmitting and receiving radiowave. The aerial is a non resonant type slotted array waveguide whlch radiates and receives an X-band horizonLal polarization microwave.One end of the aerial is connected to the magnetron via rotary joint and circ-u1ator, while the other end is terM D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - 0 1
2-1
minated with a matching 1oad. The vertical beam width 22o is wide enough to avoid losing target echoes when the ship is rol1ing. The horizontal beam width I.2" of 6-foot aerial gives good bearing resolution. Fig. 2.I.I 11lustrates an example of slotLed array waveguide aerial.
SL o t t e d w a v e g u ' i d e
M ai n b e a m di rection
Fig.
2.I.1
Slotted Array Waveguide Aerial
& 7
/
-
F e e d in g e n d
2.1.2 Antenna motor The antenna motor rotates at a speed of 2,160 rprn. It has built-in 15:1 reduction gears, and the plnion shaft is coupled to the main gear with reduction rate of 6: I to rolate the aerial at 24 rpm. The motor is powered from 24 V DC with power consumption of 15-watt. A photo-interrupLer is mounled on the motor to generate azimuth (AZI) pulses. Fig. 2.I.2 shows a simplified schematic of the antenna motor assembly.
SL o t t e d A r r a y A e r i a L Pini on Reduction Motor^
A ZI G e n er ^ a to r Fig. 2.I .2 2.I .3 SIIF and AZI
Antenna Motor Assenbly
generators
(1) SHF A lead switch associated wlth a magnet is provided for generaLing the ship's heading f lash (SHF) signal. At the moment when the rnagnet rnounted on the main gear passes by the lead switch, the contact closes and gen* erates negative phase SHF pulse signal. The signal is fed to the buffer amplifier Ql-d of the scanner connection board (S CON), and then delivered to the display unit via pin #18 of E1.
(2) AZr 0n the end of the motor shaft opposit to the pinion gear, a hole is made along the diameter. As shown in Fig. 2.I.3.1, the holed end of the shaft is inserted into the photo interrupter Q3 which produces two pulse signals at every rotation of the shaft. As the motor normally rotates at a speed of 36 revolutions per second, the repetition rate of signal 1s 72 pps. The aerial is rotated at one 90tfr of the motor revolution with the built-in gears and pinion/main reduction gears, 180 pulse singals are produced per one revolution of the aerial. The signal is fed to the buffer amplifier in Ql-b, and then to Q4 of the PLL frequency multiplier 1 1 z-- z-
t " l D - 3 I20 / 3 2 2 0 S e r v i c e M a n u a l - 0 1
(S CON) board. The multiplier of a the scanner connection Q4 consists (VCO). When the AZI phase comparator and voltage controlled oscillator pulse train E3, from the motor is fed to Q4 pin #L4 via AZI IN terminal made of C7, CB, Q2, Q3, and R8 through R10 lowers the level the circuit The Q4 output frequency of Q4 pin #5 which makes Q4 to start operation. is ordinarily divided into I/S by dividers Q5 and Ql-a. The phase difference between output signals of the divider and buffer Qi-b is detected by the phase comparator. The error voltage is fed to the VCO so that The outthe output frequency of Q4 is held at five times of the input. (AZIP) to the disput of Q4 is delivered as 360 Hz azimuth pulse signal play via buffer Qi-c. S H Fs w i t c h Motor Shaft HoLe Photo Interrupter 03
Divider 1/6or 1/5
Buffer 0 1- d
Q5, Q1-a
Azimuth puLSe
Buffer o 1- b
L'
(S CON)
B1ock Diagram of SI#/AZI Circuir
Fig.2.1.3.1
SHF puLSe
F i g . 2 . I . 3 . 2 s h o w st h e w a v e f o r m s o f t h e A Z I c i r c u i t . E3
04-3 04-4
F _fl_Itj-l
f
[-1
72Hz 360 H2
-.--l
F-
2-8 msecapprox
o 5 - 15 o5-9 (Load ) Fig. 2.L .4 Transmitting
2.I .3.2
Waveformsof AZI Circuit
section
The transmitting section mainly consists of the nodulator, pulse transforme r , a n d m a g n e t r o n . M R T - 1 3 3f o r M D - 3 2 1 0i s b u i l t w i t h a 1 0 k W m o d u l a t o r , a n d M R T - 1 3 4f o r M D - 3 2 2 0w i t h 2 5 k W m o d u l a t o r . T h e o p e r a t i o n a l t h e o r y o f m o d u l a tor is similar to both models; however, number and ratings of some components are different. In the following description, the ratings and compo* nents with brackets t ] apply to 25 kW modulator. Fig. 2.I.4 showsa simplified block diagram of 10 kW modulator together with pulse transformer, magnetron, and protection diodes. Refer to respective circ.uit diagrams for detailed numbersof the circuit comDonents. ( 1) Modulator A Itwo] thyristor is used for producing hfgh voltage negative pulses to actuate the magnetron. Capacitors C9 to C16 [C9 to C22] of the pulse f o r m i n g n e t w o r k ( P F N ) a r e c h a r g e d u p b y t h e + 3 0 0 V ( M O DS ) s e n t f r o m t h e MD-32I0/ 3220 Service Manual-O1
. \ 2 L_J
display power supply, via charging choke T1 [Ll] and series diode Q7. The charging operation utilizes the resonant frequency determined by inductance of the charging c.hoke and capacitance of PFN. The charging current flows only in the positive half-cycle of the resonant sinusoidal wave and the voltage reaches twice as much of the source voltage. The diode Q7 blocks reverse current series flow in the falling perlod so that the line is held in high voltage. I
I Ch a r g ' i n g
I,chokT e1 | -
H.T, s u p pL y
Seli es d ' io d e Q 7
t--KTlTK-ZII-Ksl L-J
L--J
llagnet ron M icr o w a v e
ChokeL9 Thyli ster Q9
Trigger i nput
Trigger
Protecti on diodes
P r o t e c ti o n diode Q10
GND M a g n e tr o n heater
Mag. Cur. detector
I Fig,
2.I.4
Sinplified
P ut s e t ransformer
Block Diagram of 10 kW Modulator
S h o r t l y a f t e r t h e c h a r g i n g v o l t a g e b e c a m e m a x i m u m ,a t r i g g e r p u l s e i s given to the gate of thyristor Q9 [Q9, Q10] and then Lhyristor conducts d i s c h a r g i n g t h e P F N . T h e L a n d C o f P F N a r e s w i t c h e d b 1 , 'r e 1 a 1 ' s K l t o K 3 as shown in the list below to determine the pulse lensLh. Table 2.I.4
Pulse Length Switching
Pulse length ( u s e c)
0.08 0.3 0.6
r.2
R el ay
K1
K2
K3
OFF ON ON ON
OFF' OF'F ON ON
OF'F' OF'F OFF' ON
The protection d i o d e Q l 0 I Q l 1 ] a v o i d s d a m a g eo f t h y r i s t o r reverse voltage. Choke L9 IL9, L10] protects the thyristor current at the momenl when i t i s t u r n e d o n .
caused by a from a rush
The circuit around T2 [L13] and Q11 [Q13] i" provided to detect the maenetron current for monitoring the performance of the transmitLer. (2)
Pulse transformer
and magnetron
When the thyristor conducts, a discharging currenL flows from PFN capacitors through the primary winding of pulse transformer (PT), producing high voltage negative pulse. The output voltage of PT is Lhen stepped up to 5.8 kV [7.8 kV] to energize the magnetron Vi. As the PFN impedance is designed as matching to the magnetron impedance via pulse transformer, the energy from PFN is efficiently transferred Lo the 1oad. Unavoidable s11ght mismatching between them may cause to induce a reverse voltage at the magnetron cathode. Protection diodes Ql and Q2 with Rl are provided to shunt the reverse voltage to protect the magnetron.
2-4
l4D-32L0/ 3220 Service Manual-Ol
2.I.5
Duplexing
assenbly
V4 and limiter V5. Circulator The duplexing assembly consists of circulator FCX68 for both type scanners functions to switch the microwave signal among periDuring the transmitting the rotary joint, transmitter, and receiver. feeds the high power magnetron output to the slotted od, the circulator arIn the receiving periray aerial without leakage to the receiving section. microwave signal od, the clrculator transfers the receiving to the front with verv 1ow loss of the po\,{er. end module via limiter
T h e l i m i t e r d l o d e N J S 6 9 3 0[ S - L X 1 7 ] p r o t e c t e s L h e f r o n t e n d m o d u l e M I C f r o m a high power microwave invasion, internally from Lhe magnetron or external1y from other radars. 2.I .6 Receiving section The receiving section consists with a logarithmic amplifier. ( I ) Front
of
the
front
end module (FEM) and IF
unit
end module (FEM)
A rnicrowave integrated clrcuit so cal1ed MIC is used for the front end module (FEM) of the receiving The i0 kW output scanner MRT-133 section. uses the MIC type NJTi946, while 25 kW scanner MRT-134 uses type S-RX34. Both types require separate limiter, i.e. NJS6930 for MRT-133 and S-LXI7 f o r M R T * I 3 4 . T h e I V I I Cm a i n l y c o n s i s t s o f a w a v e g u i d e - t o - c o a x i a l convertFET 1ocal osci-llalor, er, 1ow nolse fronl end GaAs FET amplifier, ba1anced mixer, moniLor circulL, and power supply. A11 elements are mounled in a single module, making the FFM so compact. The GaAs FET amplifier directly amplifles the X-band microwave of the returned echo signal. The FET 1oca1 oscillator frequency in 9,470 MHz is simply controlled by varying The balanced mixer converts the receivlng the tuning voltage. signal f requency to 60 NH,z intermediate f requency ( IF) . Fig . 2.I .6 illustrates the block diagram of MIC front end module. M o n it o r
M o n it o r C ' ri c u i t
RF i nput
W a v e g u 'di e to-coaxi aL Converter
GaAs FET AmpLifier
B aL a n c e d Mixer
P o w er S u p pt y
F E T L o c aL 0sci t tator
O p er a t i o n V oL t a g e (+5 V)
Fig.
2.L.6
IF out put
T u n ' in g V oL t a g e (+4 V to +24 V)
GND
Block diagram of MIC Front End Module
MD-32IO/ 3220 Service Manual-0l
2-5
(2)
IF unit The IF unit pass filter,
mainly consists of the logarithmic amplifier,
preamplifier, low-noise linear and tuning indication circuit.
band-
Transistor with approx. 20dB gain. The Q6 makes low-noise preamplifier rrQrr receiving bandwidth of the amplif ier is determined by of the bandr f Q r f ( B P F ) pass filter made of Ll and C54. The is controlled by BW signal sent from the dlsplay, pulse width as shown according to transmitting in Table 2.1,6. In long ranges, BW signal becomes 12 V and diode Q5 is t r Qrf fr Q r r cut of f increaslng High brings sharp resonance of the circult. and high gain to the amplifier. In short ranges, BW signal becomes 0 V frQfr turning Q5 to conduct, lowering L o w f f Q r rb r i n g s b r o a d of the circuit. resonance with high fidelity presenting short range images. for clearly
Table 2.L.6
Tx Pulse Width vs IF Bandwidth
Tx Pulse l{idth ( u s e c)
IF Bandwidth ( M H z)
BW Signal
0.08& 0.3
15
O V
0 . 6& r . 2
5
+L2V
The logarlthmic IF amplifier circuit is made of cascade connected seven dual-gain log-amplifiers having high fidelity of pulse signal anplification. The IF signal is amplified by Q6 through Q35, and then detected by by the video amplifiers Q37. The detected signal is then amplified Q39, a n d Q40, Q41. Amplifiers output of Q6. The transmitQ43 through Q51 receive partial ting pulse leaked from circulator and converted to 60 NIHz IF by FEM is delecled by this circuit and transformed into DC voltage for tuning indication in the display. The bandwldth 5 Wlz of the circuit is given by C74 and T2. In order to avoid interferences of other radars for stable tuning indicati-on, period when Q43 is enabled only for Lhe Lransmitting TRIG signal is applied.
The front end module MIC tuning voltage +25 t5 V is supplied from the display. The semifixed resistor Rl is adjusted so that the receiver is tuned to the best polnt on the long range when the voltage is +25 V.
2-6
M D - 3 2 I 0/ 3 2 2 0 S e r v i c e M a n u a l - 0 1
2.2 Display
unit
The display semblles.
unil
consists
(1) (2) (3) (4) (5)
Power supply Line filters Logic upper Logic lower Control panel with membranesheet ( 6 ) C R Tu n i t
The block
diagram of
of
the
following
printed
circuit
boards and as-
MD-32 LO/ 3220-6000 M D - 3 2 1 0 - 6 1 0&0 L F 2 i 5 N E W MD-32 10-7000 M D - 3120 - 7 10 0 MD-32 10-7200 KzOMM-O 1B
the display
unit
ls
illustrated
in
Fig.
2.2
From Gyro'-"-) I
r-----",-_-i--l I
I G Y R OI N T E R F A C E I
KsA-08 I i i'iiA-iit-7ooo'l
iipl-qi-qp.go_: I
I i'i{ir:cis:a2oo-r
To/from ANTENNA UNIT
Fig. 2.2 Block Diagran of Display Unit 1 2 1 2 4 1 3 2V D C( i l D - 3 2 1 0 ) 24 VDCt10Z 0{D-3220)
2.2.I
Power supply (l'lD-321O/322O-6000)
M D - 3 2 1 0i s o p e r a t e d b y t h e s h i p t s m a i n s o f 1 1 L o 1 8 , o r 2 I t o 3 6 V D C , w h i l e (MD-3210M D - 3 2 2 0b y 2 4 V D C I I O Z . T h e s h i p ' s m a i n i s f e d v i a l i n e f i l t e r s 6100 and LF-215). The power supply MD-32I0/3220-6OOO is used for both type radars. The power supply converls the ship's mains to several kinds of supp 1 y v o l t a g e s b y m e a n so f a p u l s e c o n t r o l l e d s w i t c h i n g r e g u l a t o r . F i g . 2 . 2 . I (a) shows the block diagrarn of the power supply and line filters. (f)
Control circuit The control circuit (IC3) functions Lo oscillates the swltching square wave signal and controls the duty of that signal in order Lo regulate the output voltage 1eve1. When the power is Lurned 0N by pressing the POWER switch, approx. i0 V starting vollage is given lo the control circuil. According to the CR constant (CB, R20, and VRl) connected to the
M D - 3 2 I O/ 3 2 2 0 S e r v i c e M a n u a l - 0 1
') L - t
-7
IC, the circuit oscillates a switching signal ln a frequency of 70tlkHz. Half-c.ycles of the signal are alternately applied to push-pu11 switching 1 and 2 respectively. The width of applied square wave is concircuit so that the output voltage of the circuit is stabilized. trolled
+ 8 V L'ineFiLters 12/?1V !10t
tYlD-3210-6100
&
S w it c h i n g Circuit 1 Q 1, 2 , 1 1, 1 2 Reg.+/-1? V & Const.Current Rectifier D 1, 3 3 , 3 4 , r c l , 5 r 4
L F - 2 15 Switching Circuit ? Q 3, 4 , 1 3 , 11
+ 10 0 v Rect'ifier D 4 t o 7
O v e rV o L t . Q9, 10
POI"JER Switch
P o w er 0 N a 5 t o 8
C o n tr o L Circu'it
Power 0FF Q 16 , 1 7
rc3
Soft Start c11 P<'1 <7
Error VoLtage Detector Q 1 9, 2 0 , 2 8
+ 300 V Rectifier Tx D 1 2t o 1 9 S w i t c h
+300 v
Q23to ?6,29
D3
(a)
+100 V
R e g uL a t e d +15 v
?4U
2.2.I
R e g uL a t e d -12 V
+50 v
Rectifier
Fig.
R e g uL a t e d + 5 V R e g uL a t e d +12V 1 4 a g n er to n heater
Floating 2 4 V D C
Block Diagram of Power Supply and Line Filters
Just after the power is turned 0N, the soft-starL gradually accircuit tivates IC3 preventing rush current and ringing of the switching circuit to protect the switching FETs, and r e c t i f l e r diodes. Typical waveforms a r e s h o w ni n F i g . 2 . 2 . 1 ( b ) . 0 s c i LL a t i o n I C 3 - 5 Soft-start
IC3-4
Switching-1 IC3-8 S wi t c h ' in g - 2 I C 3 - 1 1 Error detect IC3-1
Fig.
2.2.L (b)
Waveformsof Control Circuit
Whenthe soft-start p e r i o d c o m p l e t e s a n d t h e D C v o l t a g e s b e c o m es t a b l e , a part of the +100 V output is fed to the error voltage detector (Qi9, 20, D36). VR3 [V ADJ] sets the reference point of the voltage regulator The error voltage is fed back by photo-coupler Q2B to the concircult.
2-8
MD-32I0/ 3'220 Service Manual-Ol
circuit trol so that the
IC3 to automatically adjust error voltaee is minimized.
the
duty
of
switching
waveform
detector-l If the ship's main supply is higher than 42 V, over-voltage (Q9, 10) doesn't al1ow IC3 to start switching oscillation. Over-voltage (Q30) monitors voltage of the motor power 24 V detector-2 the output diode D3. The voltage is adjusted by VR2 [V LMT] and fed to rectifier output Q30 via zener diode D2B. If the ship's main supply or oscillating of IC3. high, Q30 conducts to stop operation 1eve1 become excessively Fu11y clockwise position of VR2 corresponds the ship's main of 4L V. W h e n P 0 W E Rs w i t c h i s p r e s s e d f o r m o r e t h a n 3 s e c o n d s , C 1 3 i s c h a r g e d u p first ^.'d then CL4 ls charged up through Q16 and D25. Q17 and Q15 then conduct consequently to stop IC3 switching operation. (2) Rectifier
circuits
Stepped up/down switching wave voltages derived from secondary windings of transformer T1 are rectified and smoothed by fu11-wave or bridge-type rectifiers into various DC supply voltages. +I2 V, -I2 V, and +5 V are furLher regulaLed by respecLive Lhree LerminaL volLage regulaLors. The magnetron heater vollage is supplied from IC5 through R45, 46, 82, delivers 0.55 A constant currenl in short range and and VR4. The circuit 0.44 A in long range operaLion Lo the magnetron heater. The output volt6,3 V at magnetron heater. VR4 age at TP5 is approx. 7 V for obtaining adjusls the currenl Lo 0.55 A constant in short range operation. In long 'high' sigrange, the logic board CPU delivers IH.C.: heater control] photo-coupler the na1, which actuates Q32 to shunt VR4. As a result, O.44 A constant current to the nagnetron. circuit becomes to deliver 2.2.2
Logic
section
The logic lower boards. section is composed of the logic upper and logic with a CPU to digitally The logic upper board basically control functions the sysLem. The logic lower board mainly functions to process the radar pu1se. video signal, os well as to produce trigger (1)
Logic upper (MD-3210-7000) The logic
upper board consists
of
the
following
circuits:
CPU and peripheral circuit (ACRTC) Advanced CRT controller A C R T Cc o n t r o l circuit Character video memory Character output circuit DIP switch reading circuit Others
( a ) C P Ua n d p e r i p h e r a l
circuit
A 1 6 - b i t m i c . r o p r o c e s s o r U P D 7 0 2 0 B( V 4 0 ) i s u s e d a s CPU with 64-k ROMand 8-k RAI'I.The CPU transfers B-bit dala through Lhe d a t a b u s . A d d r e s s b u s c o n t a i n s A 0 t h r o u g h A 1 9 . A 0 t o A 7 a r e l a t c h e d a t I C Z C ( H C 3 7 3) , A 1 6 t o A19 at IC2H (HC373), while A8 to A15 are directly transferred from CPU. M D - 3 2 L 0 /3 2 2 0 S e r v i c e M a n u a l - O l
2-9
C P Uo p e r a t e s w i t h 1 0 M H z c l o c k m a d e f r o m t h e 2 0 W l , z o s c i l l a t o r
output.
When the power is turned otr, the power-on-clear (POC) IC4K holds RESET terminal ( pi. #7I) of CPU in "1ow" for several milllseconds after the l o g i c v o l t a g e h a s b e e n s t a b i l i z e d . C P Ui s r e s e t ( c l e a r e d ) i n t h i s p e r i o d u n t i l t h e l e v e 1 b e c o m e s " h i g h " . A t t h e s a m e t i m e , P O Cs i g n a l d e l i v e r e d f r o m P O Ct e r m i n a l r e s e t s o t h e r d i g l t a l circuits s u c h a s R A Ma n d A C R T C . CPU is provided with built-in serial data control unit (SCU) to accept a s e r i e s i n p u t d a t a d i r e c t l y f r o m n a v i g a t o r s v l a R X Dt e r m i n a l . T h e b l o c k d i a g r a m o f C P Ui s s h o w n i n F i e . 2 . 2 . 2 . I . AddresB s us
D a l aB u s
D0-
P o w e r-0 n C l e a r( P O C )
+5V
S e r ia l D a t
r
v l r v
R Ol E | nabl e
ACRTC
RXD AZP
Tntorlrrrrt r r r u r . r
RESET
I NTP2 I NTP3 i N T P 6 P O C--t
{ I NT3
t I NT6
oth
ROM Enable
devi ce
2.2 .2 . l
T h e C P Ua c c e p t s f o l l o w i n g rNTPZ INTP3 INTP6
RAMEnabI e
, I POCt o
Fig.
DIP S wti c h
Block
inLerrupt
Diagram
of
CPU
signals.
AZP sent from logic lower board (Reformed AZrP) Transfer end slgnal from KCD-24 Request from gyro interface uniL
AZP and Lransfer end signal control the timing of data transfer from LSI to radar memory. The azimuth pulses are generated in the antenna drive motor. The signal is applied to the PLL 6-time frequency multiplier in t h e S C O Nb o a r d a s m e n t i o n e d i n p a r a . 2 . 1 . 3 ( 2 ) , a n d 1 , 0 8 0 A Z I P p u l s e s are senl to the display per one antenna revolution. AZIP is reformed in t h e l o g i c l o w e r b o a r d i n t o A Z P a n d s e n t t o C P U . B e t w e e n A Z Pp u l s e s , C P U generates final timing pulse AZI to transfer 6-sweep dala from LSI to the video memory. A total of 6,480 sweep data transfer completes one antenna revolution, i.e. 360' rotation. Fig. 2.2.2.2 shows the data transferring tlming chart. AZP r
Data setting
AZI IIII} transfer
Fig.2.2.2.2
2*ro
Data Transferring
Timing Chart
M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - 0 l
(b)
video
(ACRTC) and character
Advanc.ed CRT controller
memory
images other than ACRTC IC9C (HC63484) generates all Under CPU control, symbols, marks, &s well radar images. Those images include 1ines, rings, VRM/EBL values, and as alpha-numerical characters such as range scales, video into the characler other data. The produced image data are written memories from IC5A to IC12A. Ihe operating clock is 2CLK whic.h is made DCK of video RAM into I/8. Fig. 2.2.2.3 by dividing the reading clock periillustrates the block diagram of ACRTC, video RAM (VRAM) and their oheral devices.
a o , ,{
R a da r Display Address
ADO-AD15,
D0-D7 A. IC R T C f qC
LREADY-L lf-$yfi]
CRTunr t
\/D <_-
InterfaceFI r c g H , 3 IF
Address Latch IC8C,8D
DTACK
E. SYNC-
nuOu, L S fI VCK---
VRAH I C s A 6, A , ]A , 8 A , 9 A ,1 0 A ,
P a r a. - t o Serial Converler IC3A,4A,
C h a r aLc e r Video 0uLpuL
r3A,138
DCK
1 H1
Fig.
2 .2 .2 .3
Block
D i agran
of
A C R TC and P eri pheral
D evi ces
E.SYNC synchronizes the presentation of radar echo image and charac.ter v i d e o . I t h a n d l e s t h e r a d a r L S I a s m a s t e r d e v i c e a n d A C R T Cs l a v e ; h o w scanning line number 1,153 for 2O-inch CRT exever, 3s the horizontal number I,024, the vertical ceeds the radar LSI maximum scanning line f o r p i c t u re display, A C R T C r a d a r v e r l i c a l u s e d sync and address of are insLead of such signals of radar LSI. Fig. 2.2.2.4 illustrates the timDtdatat. i n g c h a r t o f A C R T Co p e r a t i o n , w h e r e A d e s i g n a t e s ' a d d r e s s t a n d T C L K( I C g C - 5 0 ) AS
( ICgC_53)
A D O - A D 1(6I C g C ) ( E X C E PATD B ) A D B ,A 1 7 - A D 1 9 (IC9C) ( ICgC-52) HCYC HRD ( ICgC-55) D E A l (i I C g C - 5 4 ) t
I
l
write cycie
F i g . 2 .2 .2 .4
I
l
R e a dc v c l e
A C R TC Ti mi ng
I
C hart
As shown in Fig. 2.2.2.5, the character video memory consists of four memory groups. Those groups include the memories for markers, plotting plus one group named tmask' which images, and alpha-numerical letters, determines the presentation area of the radar image picture. Contents of the video RAM is adminlstrated by ACRTC which writes and reads the data in accordance with the command or data sent from CPU.
M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - O 1
2-r1
2 , 0 4 8( 5 1 2x a ) b i t s - - -[,,, l bits
I,,
bits
Fig.
2 .2 .2 .5
C o mp o si ti on
of
C haracter
V i deo Memory
One chlp of the video RAM (TC5242562) is a device ca11ed 'dua1 port RAM' commonly used for memory of images. In addition to ordinary IIO port, it has series data output port to deliver the data in series. The memory consists of RAM and SAM (series access memory) portions, each of them is further divided into four blocks. One block comprises 5I2 x 5L2 bits R A I ' Ia n d 5 L 2 b i t s S A M . W h e n r e a d i n g t h e c o n t e n t s o f R A M , 2 , 0 4 8 b i t s m e m o ries for one CRT sweep line (5I2 in four blocks) are transferred to respective SAM in para11e1 as shown in Fig. 2.2.2.6. The data in SAM can be read out in series, like a shift register, by the series clock SC. Four bits para11e1 output of SAM is then fed to a paral1el/series con(F915) to finally verter deliver the data in series. Once the data is transferred from RAM to SAM, both memory portions become independent. That means, during relatively long period when the data is being read from SAM, RAM can be freely read or written by CPU control. Random A c c e s sP u i t
3
i'i4
RADiCAI]
5 1 2 x 5 1 2 512x572 RAS CAS cn
s r 0 I4
S I 0 3| S e r i a l S I 0 2| P o r t
SC
sr01 J
Fig. 2.2.2.6 (.)
Block Diagram of Dual Port RAM
DIP swltches Three board I.5.2 three
D I P s w i t c h e s , S W 1 , S 1 , i l 2 ,a n d S W 3 a r e p r o v l d e d o n t h e l o g i c u p p e r in order to preset the function of the equipment. Refer to para. for details of the functions set by Lhese switches. The status of switches is read by the CPU via data bus, D0 through D7.
(d) Panel interface
circuit
The panel data signal (PDT) delivered in series from the control panel is converted into B-bit para1le1 data in the panel lnterface circuit.
2-r2
M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - 0 1
The panel clock (PCK) and panel strobe signal (RCK) are used for timing. The output pulse of VRM, EBL and track-ba11 encoders are respectively c o u n t e d a n d r e a d b y C P U t h r o u g h t h e d a t a b u s. F i g . 2 . 2 . 2 . 7 s h o w s t h e timing chart of the panel i n t e r f a c e c i r c u i t . R C K( I C s E - l 2 P C K( I C B E - 1 1
m
P D T( r C S E - 1 4
M
Fig.
2.2.2.7
Timing Chart of Panel Interface
Circuit
Five pieces B-bit shifr reglsrers wirh larch HC595 (ICBE, 5H, 3H, 6H, and 4H) are provided for panel interface circuit to receive the signals from control panel. The PDT signal train is shifted lnto the registers connectedin series. Every time when the 41st data (alwaystlowtnamed d a m m yd a t a 0 ) i s e n t e r e d , a l l t h e d a t a b i t s a r e l a t c h e d b y t h e s t r o b e pulse PCK. (2) Logic lower (MD-3210-7100) T h e l o g i c l o w e r b o a r d M D - 3 2 1 0 - 7 1 0 0c o n t a i n s a n a l o g c i r c u i t s to produce p ulse width tune signal, the antenna control signals such as trigger, relay control, and others. It also has analog circuits to process radar return echo video signal entered from the antenna. Application specified process the IC (ASIC) LSI KD-24 is mounted in the circuit to digitally echo signals for samplirg, scan conversion, interference rejecLion, eXp a n s l o n , a n d t o w r i t e L h e r a d a r v i d e o d a t a i n t o t h e v i d e o m e m o r yu n d e r the control of CPUin the logic upper board. The radar video data in the v i d e o m e m o r y i s t h e n c o m p o s e dw i t h t h e c h a r a c t e r v i d e o p r o d u c e d i n t h e logic upper, and sent to the CRTunit to displuy. For understanding the ASIC LSI for (a) Analog signal
processing
circuit
radar Type KCD-24, refer (Circuit
to Appendix.
diagram 3/3)
Fig. 2.2.2.8 the block dlagram of analog signal processing illustrates j-s designed to accept video sigcircuit. The front end of the circuit nals of 2 Vp-p maximum 1eve1. As the raw video signal sent from the V p p , 3 . 5 l e v e 1 i s a p p r o p r i a t e l y antenna unit is about the adjusted to 2 Vp-p by the potentiometer VRl IVIDEO IN]. The FTC circuit suppresses the rain or snow echo images by attenuating Transistor the low frequency component of the slgnal. Q2 detects rapidly The FTC control voltage sent falling edge of the incoming video signal. from the display 1s given to Q40 and varies the current flowing through diodes D2 and Dl. In other words, the operating voltage 1eve1 at Q4 base is determined by diodes according to the FTC control, and front edges of Tranecho signals are selectively amplified by the following circuit. sistor Q3 stops the current of echo front to flow through D2 and Dl. The STC waveform is made from the trigger pulse fed to ICIL. Ttre maximum amplitude of STC waveform is adjusled by VR2 ISTCLEV], while the starting time by VR3 [ STC TIME] . The discharging curve of STC waveform is determined by the CR time constant given by C10 to C13, and R22 to R25. When the STC voltage is applied to Q7, the load resistance of Q5 is 1ow-
M D - 3 2 1 O / 3 2 2 0S e r v i c e M a n u a l - 0 1
2-r3
ered and the video gain is decreased. According to the recovering voltsBe, the gain of distant echoes is recovered. STC knob of the control panel varies the 1eve1 of STC curve to adjust the effective area of STC.
DVz') DV6i R adarL SI
3.5Vp-p I na x . A nt enna
DV7)
-r Video VR1 tr
C o n tro i Q 2, 3, 4 0
1
fr
Conlr oi Panel FTC STC GAIN
C o n tro l Q 8 -1 0 , D 5 I, C l L
C onl rol Q39,D10
S T Cl e v e l VR 2 STCtime VR3 Tri.gger F iB.
2 .2 .2 .8
Bl o c k
Threshol dV R 4 D i a g ram of
A nal og
S i gnal
P rocessi ng
C i rcui t
The voltage given from GAIN control varies the operational resistance of Q16 Lo adjust the amplitude gain. The bandwidth of low-pass filter is varied by Ll and varicap diode D9 with the control signals PWO and P \ , ^ / 1d e l l v e r e d f rom CPU according to RANGE. The EXP circuit enhances the size of target images by holding the peak value to the length determined by the CR constant of C26, C29 and R54 to R60. The CR constant is switched over so Lhat image enhancement stays u n c h a n g e d o n t h e s c r e e n e v e n R A N G Ei s v a r i e d . C o n t r o l s i g n a l s E X P , E X P O , EXP1, and EXP2 are delivered from CPU. The amplifled analog signal is finally converted into 3-dlgit digital signals by high speed comparators ICZL, 3L, and 4L. The reference 1eve1 of comparator is given from the threshold circuit. The threshold is deep in short range whl1e shallow in long range, So Lhat the noise densitiy on the screen becomes uniforrn. The Lhreshold leve1 is adjusted by VR4 THO, TH1, THz, and TH3 by signals ITHRESHOLD], 3s well as controlled sent from CPU. The digitalzed video signals, DV2, DV6, and DV7 are sampled by 77.673 Nfrfz high frequency sampling circult composed of IC6X, 6Y, and 62. The output of these circuits is sent to the sampling circuit of t he ra d a r L S I KC D -2 4 . (b)
Radar LSI
(KCD-24, ICTT)
The application specified IC (ASIC) radar LSI KCD-24(IC7V) is control1ed by the CPUthrough data bus. The radar LSI contains major radar s1gna1 processing circuits as listed be1ow. Sampling circuit and sampling clock High speed buffer memorj-es Interference rejection circuit Polar to X-Y coordinates converter CRT drive control Others
Fie. 2.2.2.9 illustrates
2-r 4
divider
the block diagram of radar LSI KCD-24. MD-32L0 / 3220 Service Manual-O1
CKIF'
Divider
EXCK SST DV7
Z n dB u f f e r l ' Iemo ry
1st Buffer M e mr o y
Sampling
GDO -GD2
uvo
x 0 ,x 1
DV2 nDnn
VCK
Buffer ry l'|emo I Contro
r- O lo X-Y Coordinates Converter
KO -K7
A ddress Selector
Horizontal Ad d re s s C o u n te r V e r ti c a l Address Counter ConLro I signals Fig.
Flow of i)
B l ock
2 .2 .2 .9
signals
in
D i agram of
processing
radar
R adar LS I K C D -24
operation
is
explained
as fo1lows.
Sampling The di qi tal radar video signals DVz, DV6, and DV7 sampled 1n the high sampled in the frequency sampling ICs IC6X, 6Y, and 6Z are further p u l s e . Nurnber of the at the leading edge of SST timing LSI, starting samples per one radar s\^/eep is set to 800 constant by CPU. Because according to range sca1e, the sampling the radar sweep period differs frequency is determined by the selected range. The reference signal for sampling clock pulse is generated by the 77.673 MHz oscillator (Y1), divided by IC7Z,7Y, and 7X, then fed to LSI as CKIF at ICTTsampling intervals the LSI to make correct 1. CKIF is divided within in accordance with the selec-ted radar range.
ii)
High speed buffer
memories
para1le1 data is converted to 8-bit The sampled radar video signal h a s T h e m e m o r y capacity for a m e m o r y . l s t w r i t t e n b u f f e r i n t o t h e and a r e a i s a l t e r e d at the tirnm e m o r y T h e holding two sweeps video data. ( S S T ) . 8 0 0 bits samplW h e n c y c l e o f o n e trigger ing of transmitting t o t h e Znd bufi s i m m e d i a t e l y t r a n s f e r r e d ing is completed, the data ( I R ) i s turned otr, two rejection fer memory. When the interference and then r e a d , c o r r e l a t ed, s\{eep data memories are simultaneously from the v i d e o d e l i v e r e d T h e r a d a r i s written into the Znd buffer. 2 . 2 . 2 . I 0 shows G D z . F i g . s i g n a l s , G D Ot o 2nd buf fer memory as digital in LSI. the timins chart of data transfer
SST( TC7T-2) DV0-DV? to 1st Buffe
t"rl5tfiiirl: Fig.
vzzz
2.2 .z.LO
I'lD-32LO/ 3220 Service Manual-0l
Data Transf er Tining
%z%A in ISI
2-r5
iii)
Coordinates
conversion
Memory transfer from the 2nd buffer Lo the radar video RAM is started by the control pulse AZI made of AZP, the reformed pulse of AZI| sent from the antenna unit. (Refer to Fig. 2.2.2.2 Data Transferring Timing Chart.) When the data is Lransferred, address of the radar vil deo RAM is produced by the coordinates converter. That is, the polar coordinates of each bit radar video is converted into X-Y address referring the sine/cosine data set by CPU at every AZI timing. The X-y address codes X0, X1, and K0 through K7 are delivered from LSI. The data is transferred bit by bit 1n 206 ns intervals, B tlmes longer p e r i o d o f C R C Oc l o c k i n t e r v a l s . Fig. 2.2.2.1I shows the timing chart of data transfer from LSI Lo radar video RAM.
AZI(IC7T-59) 2ndBuffer to
videoslsv%i77,v7v,%v,,%v7.v777,777777V%i777,777V,%V%
I N T( I C 7 T - 4 3 ) Fig. iu)
2.2.2.Lr
Radar video
Data Transfer
RAMand peripheral
Timing
from LSr ro VRAM
circuits
Six chips of 1 M-bit dual port RAM (1PD42274V, ICTF ro 7H, 7J ro 7L) are provided for radar rmage, while four chips of the same RAM (IC7B to 7E) for trail image video. A total of I,024 x 1,024-bit memories are allocated t o w h o l e C R T s c r e e n . A r n o n gt h e m , a c i r c l e with 9BO bits horizontal or vertical diameter is assigned to the radar irnage area. In a conventional method, one radar video memory area was directly up-dated regarding the existence or not of the echo signals on the latest pulse transmission. This method has a disadvantage that the radar information in the pixels near the sweep center may be reduced. The reason is that such a pixel participales in many sweeps and if the latest sweep does not contain echo, previous return signal in the same pixel is 1ost. In order to improve such disadvantage, the memory for radar image is divided into two groups, and used simultaneously as shown in Fig. 2.2 .2.I2. O n e g r o u p c o n s i s t s o f I C T F, 7 H a n d 7 K ' , while the other group IC7G, 7J and 7L. When one 1s writing radar echo images, the other is erasing previous image data. The siatus is a1tered by SHF pu1se. SHF
SHF
W r it e E r a s e di n L a s t a n t e n n ar o t a t i o
M e m roy
M e m o r yo f L a s t s c a n n in g
Memory Composed Video 0ut put
Fig. 2.2.2.12 2-16
Read/Write Method of Radar Video Menory f'lD-32I0/ 322A Service Manual-OI
Two radar memories are read simultaneously and composed as shown in the drawing. In this method, writing any pixel does not affect previous stored memory and loslng target near scope center is avoided. When the radar sweep origin with the display centdoes not coincide of, for example when off-centering is turned ofl, CPU generally calculates appropriate transferring amount of video images from Znd buffer to video RAM. This method, however, gives heavy duty to CPU espe'true cia11y in motiont mode, ES it should continuously carry out such calculations. In this radar,800-bit memories per one sweep are transferred ful1 every time to extent of the video RAM, covering image. When reading out the data from RAM on the other off-centering hand, the portion of memories outside Lhe radar scope area is masked by the CRT video composer. Furthermore, if LSI delivered any wrong address exceeding the video RAM area, ICBN, BP, 6N, and 6P functions to cancel the write enable pulse (WEDK) derived from LSI ICTT-64. v) CRT video
composer
Fig. 2.2.2,I3 shows the block diagram of CRT video composer. The clrcuit mixes the radar video and character video by synchronlzing them with the dot clock occuring in the same timing of CRCO.The radar video irnages ouLside the effective radar scope of 960-dot dia. circle are rejected by MASK data fed from ACRTCof the logic upper board,
MD-3210-7000. Di e i t a l to-Analog C onverter Q27-34
R a d a rv i d e o C h a ra c te rv i d e o
C R TV i d e o 0uI put
D o Lc l o c k ( D C K ) Brilliance control
Fig. 2.2.2.L3
CRT Video
Composer
When jumper JP3 IMARKER] i" set to IEXOR], part of irnages superimposed wlth markers such as rlngs, EBL, and VRM becomes dark. When JP3 is set to IN0RM], such part becomes more bright. IC4AA also actuated by the dot clock synchronizes all Brilliance the gate output. of radar video images, rnarkers, trail images, and alpha-numeral letters are independently adjusted by respecLive controls on the control pane1. Signals are combined with respective data aL the digj-La1-to-analog converter. The analog voltage ouLput of the converter is amplified in the current amplifiers of these tranQ27 through Q34. Collectors sistors are connected in parallel composing a wired 0R circuit, thus the highest 1eve1 signal is senl to CRT for image presentation. iv)
TUNEcircuit Under CPU control, the logic lower board provides automatic tuning function to supply the optimum MIC tuning voltage to the antenna. In manual tuning mode, a tuning voltage is manually delivered from VR4 pane1. i{hen ITUNE] knob is turned to AUTO, CPU ITUNE] of the control automatically voltage adjusts the tuning where the to the point tuning meter shows maximum. In order to make coincidence of the receiver optimum tuning point and tuning meter maximum point, VR5 ITUNE AUTO] i" carefully If the tuning meter reaches fu11 scale adjusted. or exceeds the sca1e, AUTO TUNE does not function properly. In suc,h a case, adjust VR7 ITUNE MET] so that the tuning meter maximum point
M D - 3 2I O/ 3 2 2 0 S e r v i c e M a n u a l - O 1
2-r7
b e c o m e sf r o m 7 0 L o B O Z o f L h e f u 1 1 s c a 1 e . 2 .2 .3
Control
panel
(l'lD-321O-72OO)
The unit Control panel MD-3210-7200 is built in a tilting type case unit. is connected to the display with a 75 cm long standard cab1e. The unit can The cable can be dismounted from Lhe display unit enabling remote control. be extended up to five meters on optional order. The circuj-t is divided into para11el/series converter , EBL VRM encoder ltrac.k-bal1 controller, and contro 1s . ( 1) ParalTeL/ series
converter
IC3, R3 and C3 compose an oscillater for serial shift clock. IC4 is a programable counter with fu11 count set to 40. fCl, IC5, IC7, IC9, and ICl1 are B-bit shift regisLers to hold 40 bits of panel switch status. When a strobe pulse is delivered latch from IC4 #15, all the registers via the panel switch slatus in paral1el. The held data are then shifted IC1 #13 (QH) bit by bit with Lhe clock pulse from IC3 #2. When the final 40th bit is delivered, Lhe counter resels and produces next strobe. The lower for CPU data signal serial is sent to Lhe logic upper vla logic p r o c e s s . R e fe r L o p a r a . 2 . 2 . 2 ( 1 ) ( d ) . (2)
EBL VRM enco der/ Lrack-ba11
controller
The phase of output signal from EBL/VRM encoder differs 90o between rotations in CW (clockwise) and CCW(counter-clockwise). CR c.ircuits made of R5/7 and C4/5, 3s well as R9/11 and C6l7 eliminate chatlering of the encoder signal. The track-ba11 is provided wlth a buill-in chattering T h e s i g n a l s r e f o r m e d i n I C B a r e f e d t o C W / C C Wd e t e c t o r I C 1 0 . eliminator. C I , { o r C C \ , {o f t r a c k - b a 1 1 i s d e t e c t e d b y I C 6 . C W / C C Ws i g n a l and encoder pulse output are senL to parallel/serial converter IC11. Waveforms of those signals are shown in Fig. 2.2.3.
rc10-12 -
rc10-11
rc10-9 C tl R o ta t i on
Fig.
2.2.3
CCtl Rotat i on
EBL/VRMEncoder Waveforms
(3) Controls V R l ( G A I N ) , V R 2 ( S T C ) , a n d V R 3 ( F T C ) a r e p r o v i d e d t o c o n t r o l t h e amplification of the analog signal circuit of logic lower board. VR3 is prov i d e d w i t h F T C 0 N / 0 F F s w i t c h . T h e v o l t a g e f r o r n V R 4 ( T U N E ) i s s e n t to the MIC of antenna unit for varying the 1oca1 oscillation frequency to obt a i n f i n e t u n l n g p o i n t . W h e n t h e c o n t r o l i s t u r n e d f u 1 l y C C \ I It o A . TUNE (automatic tuning) position, the status is fed to IC7 #I4 to be sent to , R 6 ( P L O T ) , V R 7 ( M A R K E R ) and , the CPUof logic upper. VR5 (NUMERIC)V VR8 (VIDE0) control the brilliance of respectlve video signals. The marker i s n o t t u r n e d t o c o m p l e t e d a r k a s t h e m i n i m u m 1 e v e 1 i s l i m i t e d b y R l 2. ( 4 ) L a r n pc o n t r o l of lamps from DSl through DS6 with the signal Qi controls the brilliance s e n t f r o m C P Uv i a J 7 2 0 I # I 4 ( D I M M E R ) .
2_IB
M D - 3 2I 0 / 3 2 2 0 S e r v i c e M a n u a l - O 1
becomes from 70 to 2. 2. 3
Cont ro l
panel
BO%of
Lhe full
sca1e.
(I' 1 D -3 2 1 O -7 2 OO)
The unit Control panel MD-3210-7200 is built in a tilting type case unit. is connected to the display wlth a 75 cm long standard cab1e. The unit can The cable can be dismounted from Lhe display unit enabling remote control. be extended up to five meters on optional order. The circuit is divided lnto para11e1/series converter, EBL VRM encoder/track-bal1 conlroller, and controls. (1) Para11el/series
converter
IC3, R3 and C3 compose an oscillater for serlal shift c1ock. IC4 is a programable counter wilh ful1 count seL to 40. ICl, IC5, IC7, IC9, and ICl1 are 8-bit shift regislers to hold 40 bits of panel switch status. When a strobe pulse is delivered latch from IC4 #15, all the regisLers the panel switch status ln para11el. The held data are then shifted vla ICl #I3 (QH) bit by bit with the clock pulse from IC3 #2. When the final 40th bit is delivered, the counler resets and produces next strobe. The data signal lower for CPU serial is sent to Lire logic upper via logic proc.ess. Refer to para. 2.2.2 (1) (d). (2)
EBL VRMencoder/Lrack-ba11
controller
The phase of ouLput signal from EBL/VRM encoder differs 90o between rotations in CW (clockwise) made CR circuits and CCW(counter-clockwise). of R5/7 and C4/5, 3s well as R9/11 and C6/7 eliminate chatlerlng of the The track-bal1 encoder signal. is provided with a buill-in chattering elimlnator. T h e s i g n a l s r e f o r m e d i n I C B a r e f e d t o C W / C C Wd e t e c t o r I C 1 0 . C W o r C C W o f L r a c k - b a 1 1 i s d e t e c t e d b y I C 6 . C W / C C Ws i g n a l a n d e n c o d e r pulse output are sent to para11e1/serial converter IC11. Waveforms of s i g n a l s F i g . 2 . 2 . 3 . those are shown in
r c 1 0 -21 -
rc10-11
rc10-9 Cll Rotation
Fig.
2.2.3
CCI Rotation
EBL/VRMEncoder Waveforms
( 3) Controls VR1 (GAIN), VR2 (STC), and VR3 (FTC) are provided to control the amplification of the analog signal circuit of logic lower board. VR3 is provided with FTC 0N/0FF swiLch. The voltage from VR4 (TUUE) is sent to the MIC of antenna unil for varying the 1ocal oscillation frequency to obt a i n f i n e t u n l n g p o i n t . W h e n t h e c o n t r o l i s t u r n e d f u 1 l y C C WL o A . TUNE (automatic tuning) position, the status is fed to IC7 #I4 to be sent to , R 6 ( P L 0 T ) , V R 7 ( M A R K E R ) and , t h e C P Uo f l o g i c u p p e r . V R 5 ( N U M E R I C ) V VRB (VIDEO) control the brilliance of respective video signals. The marker is not turned to complete dark as the minimum 1eve1 is limlted by R 1 2 . (4) Lampcontrol of lamps from DSI through DS6 wlth the signal Q1 controls the brilliance sent from CPUvia J72OI #14 (DII'tvlER).
2_IB
M D - 3 2I 0 / 3 2 2 0 S e r v l c e M a n u a l - 0 l
3.
ADJUST},IENT C A U T I O N S (1) High voltages are applied to the antenna and display units. (2) Ship's mains supply is applied to a certain internal unit even when the power is turned off. (3) Confirm that the rated fuses are used according to the shiprs mains. ( 4 ) P r e h e a t m a g n e t r o n i n S T A N D B Ym o r e t h a n 3 0 m i n u t e s , f o r t h e f i r s t tirne or magnetron j-s replaced. turning the power on after installation, (5) Before adjustment, a11ow the equipment about 30 minutes in the transmitting condition.
3. 1
Location
of Controls
Adjusting controls and switches are located on logic upper (MD-3210-7000) and logic lower (MD-32I0-7i00) boards mounted right hand inside the display By removing fourteen (14) fixing screws, the unlt as shown in Flg.3.1. display cover can be removedto access these controls and switches. L o g ic u p p e r (ND-320 1-7000) Log'ic Lower (MD-321 0 - 7 10 0 )
D I Ps w i t c h si.J2 )wl
stJ3 V RO 1 (P.R.F.) VR1 ( V I D E OI N ) VR2 (LEVEL)
VR3 VR4 (TIME) VR5 (THRESHOLD) VR6 (AUTO) VR7 ( I ' I E T E) R( M A N U A L ) VR9 VR8 ( C O N T R A S T( T) X D E L A Y ) Stl2
Fig. 3.2
Adjustnent
After
3.1
Location
of Controls
and Switches
Installation I M P O R T A N T
After installation, mentioned be1ow. 3.2.L
do not
fail
to
rnake initial
adjustment
of
controls
as
Tuning
W h e n T U N Ec o n t r o l MD-32I0/3220 is provided with automatic tuning facility. the image gain should i s t u r n e d f u l 1 y c o u n t e r - c l o c k w i s e t o A U T Op o s i t i o n , b e m a x i m u ma s p r e s e n t e d i n m a n u a l t u n i n g m o d e s e t a t t h e m a x i m u mp o i n t b y T U N Ec o n t r o l . I f A U T Ot u n i n g o p t i m u m p o i n t i s a b n o r m a l , c a r r y o u t f o l l o w i n g adjustment in order. MD-32I0/3220 Service Manual-O1
3-1
TUNE ^A '/4
S-'
-.//
\z
((
\_
AU T O
3.2.2
1 ) W i t h R A N G Ek " y , s e l e c t 2 4 n m ( 1 o n g p u l s e ) r a n g e . 2) Set the pointer of TIINE control on the control panel at the center position as shown 1eft. 3 ) S 1 o w 1 y t u r n V R 6 ( M A N U A L )o f M D - 3 2 1 0 - 7 1 0 0 t o t h e p o i n t where targets are most strongly visible on the screen. (+25 t1V at pin #3 of the rear panel connector J6005) 4) Adjust VR5 (AmO) so that the tuning meter shows maximum (+5 t0.5V at pin #9 of the rear panel conindication. nector J6006) 5) If the tuning meter lights up all the way and the rnaxim u mp o i n t c a n n o t b e d i s c r i m i n a t e d , s d j u s t V R 7 ( l " l E T E R )s o that the maximumindicaLion becomes about 807" of fu11 scale, then repeat step (4).
Preset gain (noise level)
This adjustment is required to clearly (1) (2) (3) (4) (5)
3.2.3
display relatively
s m a 1 1t a r g e t s .
Rotate GAIN control of the control panel fu11y clockwise. Rotate STC, FIC and lllilE controls fu11y counter-clockwise. W i t h R A N G Ek u y , s e l e c t t h e m a x i m u mr a n g e . T u r n I R . E X P a n d P I I O To f f w i t h r e s p e c t i v e c o n t r o l k e y s . ) f MD-3210-7100so that noise speckle becomes Adjust VR4 (THRESH0LDo just visible. STC
(1) (2) (3) (4)
R o t a t e F I I C a n d T U N Ec o n t r o l s f u 1 1 y c o u n t e r - c l o c k w i s e . Turn IR.EXP and PLOToff with respective control keys. W i t h R A N G Ek " y , s e l e c t L 2 n m r a n g e . Rotate GAIN control of the control panel fully clockwise. ( s )R o t a t e S T C c o n t r o l s o t h a t n o j - s e s p e c k l e s a r e s u p p r e s s e d u p t o 6 D f l , and a few strong echoes remain near center of the screen. If adjustment (5) above is difficult lowing steps:
caused by excessive images, take fo1-
(5) Rotate STCcontrol fu11y clockwise. ( 6 ) A d j u s t V R 3 ( T H E ) a n d V R 2 ( L E V E L ) o f l o g i c l o w e r I ' 1 D - 3 2 1 0 - 7 1 0 0a s b e l o w . ( a ) S e t R A N G Et o 0 . 2 5 n m a n d a d j u s t V R 3 f r o m c l o c k w i s e t o c o u n t e r - c 1 o c k w i s e , s o t h a t t h e s t a r t i n g p o i n t o f S T C b e c o m e st h e c e n t e r o f s c r e e n . ( b ) S e t R A N G Et o 1 2 n m a n d a d j u s t V R 2 s o t h a t n o i s e i s s u p p r e s s e d u p t o 6 nm on the screen. 3.2.4
Trigger delay
If the image of a straight target, such as breakwater is deformed as shown below, it rnay be caused by improper trigger de1ay, according to the length of antenna cable.
Short deLay
3-2
N o r m aL
E x c e s s iv e d e L a y
I'D-32I0/ 3220 Service Manual-O1
In such a case, adjustment is madeas follows: (1) With RANGE key, select 0.25 nm. (2) Adjust VR6 (TX DELAY) of MD-3210-7100so that the image on the screen b e c o m e sn o r m a l a s f o 1 l o w s . (a) The straight targets are correctly presented. (b) A target with known distance 1s presented at correct position. Use V R Mf o r r a n g e m e a s u r e r n e n t . 3 .2 .5
SI{F and bearing
After installation adjustments mentioned above are and adjust bearing, if necessary, as fo11ows.
completed,
confirm
SHF
( 1) When the ship is mooring or calrnly anchoring, find some stationary visible targets in a distance of 4 to B nm. (2) Measure the bearing of targets on the compass as well as on the radar screen. If the radar bearing deviates more than +1o from the compass bearing, correction can be made as be1ow. +11" can be corrected to tlo by rotary switches (3) Bearing error within SW2 (coarse) and SWl (fine) error is more Lhan of MD-3210-7100. If +11o, further +5o adjustable range is provided in the antenna unlt. (4) Bearing adjustrnent in antenna unit is made as follows: f) First of all, note that images are (CW) or Lo be rotaLed clockwise ( CCW) f or corcounter-clockwise SIIF switch recting error. if) Turn off the power. iii) Open the antenna rear cover. irr) Find the SHF lead switch as shown in the right. Loosen fixing screws and move the board ful1y leftwards f or CW irnage rotation, or rightw a r d s f o r C C Wr o t a t i o n . v) Fix the board with fixing screws and restore the rear c.over. Turn on the power and transmil. vi) Readjust SWZ and SWl of MD-32107100 so that the bearing error o + 1 becomes less than on the scope.
N o t e : I f bearing error exceeds +16", check the -;^ aligned with the bow line or not.
direction
of
antenna
unit
I b
3.3
Adjustment of Antenna Unit No adjusting point exists 1n the antenna for ordinary rnaintenance, excepL for initial bearing adjustment by SHF swilch mentioned i n p a r a . 3 . 2 . 5 ,
3.4
Adjustment of Display
3 .4 .l
Power supply
(l'fD-321O/ 3220-6000 )
The power supply board is frequency, +100 V output
adjusted for the switching regulator 1eve1, and magnetron heater vollage.
M D - 3 2 I 0/ 3 2 2 0 S e r v i c e M a n u a l - O l
osc.illating Adjustment J_J
is made as following procedure. Access to the board can be made by disassembling the rear panel of the dlsplay. Fig.3.4.1 illustrates the location of measuring/adjusLing polnts of power supply board. ( 1) Oscillating
f requency
( a ) W i t h R A N G Ek e y , s e l e c t 2 4 n m r a n g e . ( b ) C o n n e c t a f r e q u e n c y c o u n t e r b e t w e e n I C 3 p i n # 9 [ E 1] a n d # 7 [ D C ( - ) o f input line]. ( . ) A d j u s t V R I s o L h a t t h e f r e q u e n c y b e c o m e s3 5 t O . 5 k L l z . (2) 100 V output voltage (a) Connect a DC voltmeter or circuit tester measurable 150 V DC. between TP3 and TP6 (GND). ( b ) A d j u s t V R 3 s o t h a t t h e v o l t a g e b e c o m e s+ 1 0 0 t O . 1 V . (3) Magnetron heater current (a) Connect a DC voltmeter or circuit tester rneasurable 3 V DC, between TP4 and TP5 t (-) sidel. ( b ) A d j u s t V R 4 s o t h a t t h e v o l t a g e b e c o m e sa s f o l l o w s : M D - 3 2 1 0 :+ 1 . 8 7 t 0 . 1 9 V M D - 3 2 2 :0 + I . 7 7 t 0 . 1 8 V VR4
TP4
TP6
rc3
VR1
VR3 Fig.
3-4
TP3
3 . 4. r
R54 Measuring/aaiusting
Points
of Power Supply
I " l D - 3 2 I 0/ 3 2 2 0 S e r v i c e M a n u a l - O l
Logic upper (MD-3210-7000)
3.4.2
A s s h o w n i n F i g . 3 . 1 , t h r e e D I P s w i t c h e s , S W I t h r o u g h S W 3a r e m o u n t e d o n the logic upper board (MD-3210-7000)in order to preset the operation of equipment. Functions set by those switches and their standard settings are listed in para. 1.5.2. 3.4.3
Logic lower (1.{D-3210-710O)
A d j u s t i n g c o n t r o l s a n d s w i t c h e s o f l o g i c l o w e r b o a r d ( M D - 3 2 1 0 - 7 1 0 0 )a r e i 1 Most of the adjustments should be carried out just lustrated in Fig.3.1. which are explalned in para. 3.2. after installation, (i)
I
t i
Pulse repetitlon
frequency (PRF)
The pulse repetition
frequency (PRF) adjustment is madeas fo11ows.
( a ) W i t h t h e f u n c t i o n s w i t c h s e t a t S T A N D B Y c, o n n e c t a f r e q u e n c y c o u n t e r to TP3. ( b ) A d j u s t V R 1 0 ( P R F ) s o t h a t t h e f r e q u e n c y b e c o m e s6 , 0 0 0 + 5 0 H z . (2) Tuning Refer to para. 3.2.I. (3) Video input 1evel In order to optimize the effect of STC, FTC and galn control, the input level of video signal from the IF unit is adjusted as follows: (") Connect an oscilloscope to TP6 (base of Q2). ( b ) S y n c h o r n j - z et h e o s c i l l o s c o p e t o t h e p o s l t i v e p h a s e r a d a r t r i g g e r . (.) Turn the radar to transmission and observe the video input signal. A d j u s t V R l s o t h a t t h e i n p u t s i g n a l 1 e v e l b e c o m e s2 V p - p . (4) Preset gain (noise level)
l'
R e fe r t o p a r a . 3 . 2 . 2 .
(s) src Refer to para. 3.2.3. (6) Trigger delay Refer to para. 3.2.4. (7) SHFand bearing Refer to para. 3.2.5. (B) Jumper pin setting In order to set operational conditions of the unit, five jurnper pins a r e p r o v i d e d o n t h e l o g i c l o w e r b o a r d ( F f D - 3 2 I 0 - 71 0 0 ) . F u n c t i o n s a n d initial setting status of those pins are explained 1n para. 1.5.1. M D - 3 2 I 0/ 3 2 2 0 S e r v i c e M a n u a l - O l
3-5
3.4.4
CRTunit (PWD-1050A/PI{D-1051A)
The CRT unit adjustment is roughly divided into four categories, i.e. synpi-cture size, brilliance, chronization, and focus. As the CRT uniL applies extra high tension, extrerne care should be taken when adjusting controls. (1) Access to controls (a) (b) (c)
Remove all the fixing screws of the At the bottom of displuy, the main Find various controls as shown in [H.WIDfiI] . PWD-I051A is mounted on
display cover and open it. b o a r d P W D - 1 0 5 0 Ac a n b e s e e n . Fig. 3.4.4.L. Also find coil the CRTsocket.
LAO2
R3sl-tT:EO-tE
R sztE:FOml
R4s1tE:ffiEl @ @ grrP=*-r L4O2IIT:ETtrMI
R3s4 rs.eoffil a
R3s3 rT-In@l ^R3ss |v:eEFF-l
R2 5l-
IEm:ddml
@
?)
Flyback Tilansf
@"nss [Gr:m'Jl
oriner
lEeus-l Fig. 3.4.4.I
Location
of Controls
on CRT Main Board
(2) Adjustment (a) Turn 0N the radar transmitter, after 3 minutes STANDBY. (b) Display some letters or symbols at four corners of the (or any CRT, with EBL, VRM, o t h e r s y m b o l ) , a n d E N T E Rk e y s . ( . ) S 1 o w 1 yr o t a t e R 4 5 5 [ G l . A D J ] t o show back raster on the CRT. (d) By adjusting R451 [H.PHASE], make the spaces at left and right edges of back raster equal to each other as shown in Fig. 3.4.4.2. ( e ) B y L 4 O Z [ H . W I D T I I ] , a dj u s t t h e width of back raster to almost fu11 of the CRTscope. Fig.
3-6
3.4.4.2
Back Raster
M D - 3 2 I 0/ 3 2 2 0 S e r v i c e M a n u a l - O 1
(f) (\ o ) o /
By adjusting R353 [V.LIN], make the size of top letteres 000 and bottom letters 180 of the bearing scale equal to each other. Al ion tr^rs magnet rings around the CRT neck on a line along which the center of back raster is wanted to move, os shown in Fig. 3.4.4.3. By nanipulating two magnets carefully, shift the back raster to the center of CRT, so that top/bottom and lefr/right gaps between CRT and raster are balanced. Also adjust R355 [V.CENT], if necessary. After adjustment, fix the rnagnets with silicon rubber or the 1ike.
Magnet
ll
V
,/i I
I I I I
Fig. 3.4.4.3
Back Raster Centering
( h ) \iiLh R352 [V.SIZE] conrrol , sdjusL Lhe verlical diameter of the radar scope circle to 274 t2 mm (20 rnches) . If upper and lower radii are (a ), adSusL R353 unbalanced as shown in F.g. 3.\.4.! [V.LINl ro make correct marker rings rn real circles. ( r ) If the linearity o n r a d i u s i s a b n o r m a l a s s h o i v ni n F i g . 3 . 4 . 4 . 4 ( b ) , correct it by R354 [S.CORRE].
a>
a>b>
(a)
(b) Fig.
(j)
3.4.4.4
Abnornal Linearilty
If Lhe display at corner of the raster is deformed as shown in Fig. 3 . 4 . 4 . 5 ( u ) , c o r r e c t i t b y r o t a t i n g m a g n e t s m o u n t e da t f o u r . o r n . i " o f t h e d e f l e c t i o n y o k e a s s h o w ni n F i g . 3 . 4 . 4 . 5 ( b ) .
( k ) R o t a t e R 2 5 1 [ S U B . C O N T ]f u 1 1 y c o u n t e r - c l o c k w i s e t o o b t a i n r h e m a x i m u m contrast, and then s1ow1y lower the brightness of back raster with R 4 5 5 [ G l . A D J ] s o t h a t t h e b a c k r a s t e r h a s j u s t b e c o m ei n v i s i b l e . M D - 3 2 L 0 / 3 2 2 0S e r v i c e M a n u a l - O 1
3-7
E -#?i+sr--I
t
Magnet
(a) Fig. 3.4.4.5
(b) C o r n e r D i s p l a y Alignrnent
( 1 ) A d j u s t [ F 0 C U S ] c o n t r o l ( s o r n e u n i t m a y b e m a r k e d I S C R E E N) ] o n t h e f 1 r ' back transformer to obtain fine focus of the picture on the CRT.
3-B
M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - O 1
i
4.
IIIAVEFORMS
4.I
Antenna Unit
4.1. I
I'[RT-133 (t[D-3210)
( 1 ) H V short pulse (SP) ( a ) Modulator 239U52236
e
E5: TX trigger X scale: 500 nsec/dtu Y scale: 5 Y/div
\ \
OV OV
I
(b) Pulse transformer T1 Pin #6 (YEL): SP to magnetron
-r
L
I
tl
X scale: 500 nsec/dlv Y scale: 2,000 V/div (2) HV long pulse (LP) (a) Modulator 239U52236
\
E5: TX trigger X scale: 500 nsec/dtv Y scale: 5 V/div
\ OV O V
I
(b) Pulse transformer T1 Pin #6 (YEL): LP to magnetron X s c a l e : 5 0 0 n s e c/ d i u Y scale: 2,000 V/div
i-
I L-
/
(3) HV charging waveform (u) Modulator 239U52236 E5: TX trigger X scale: 100 usec/div Y scale: 5 V/div
||
_l
i I
L__
7
(c) Modulator 239U52236 E6: H.V. charglng X scale: 100 usec/d:-v Y scale: 200 V/div
IL /
{ T
/
I
/
lt
(4) AZr pulse ( d ) Scanner connection (S CON)
E3: AZI input X scale: 2 msec/dtu Y scale: 5 V/div ( e ) Scanner connection (S CON)
E4: AZI output X scale: 2 msec/a:-v Y scale: 5 V/div MD-32I0/3220 Service Manual-01
4-r
Checklng points
frfrnn i"
--JF ctc
rO
tF
.(\,,
l
l
l
F
F
l " l " l "
l
r
T t
l
T t
T l
t
t
L2
Q10
--4^!Lo
l
L3
1n
t.t
ltn
t\o
I F
I F
I F
I F
1 " f 1 " f
F
T I tT I l t t
I'b,rln
R15
.l
239U5 2236Y3
l.l0D
[[nn
L4
L5
L6
!i- x
o
r *
F
E,
i
|
*o t \ ) l
" t l
I 1, lz
J2
t
c5..
I
I
{F-
f I1
_-/*
Ir
li'
:r
l
t
l
t E( GNS
c21
I
a)
(\ F
G
E,
II.I JAPAI{
(a)
Fig.4.1.I.1
+'
E rr )1 {t e,
(.)
JI
LE
L9
_=/TTL
t i
L7
l0
kW Type Modulator
FtrDI"LATOR U2 10 KIdTYPE ?39U522368 h
6 €!r
Y
z
s333 TCOGJ trJ lrJ LrJ
U U
U
i
]
t!
) ;
3
UJ
F
J
U
) J
U
,rl E2 -L o l {
PtI-SE TRANSFMTER T1 2 4 T1 2 2 0 9 8
l 1 l
r
9+' r
AZr.OuTfi2
I l
? - n ,, l I q S H FO U T
O.: E
6 i g
(b) 3.lo-.u, 33o-",, HvR-3Hz t-ivl-?HzRt \4,
E60
!*'?l
I
S/ q{3ff\,-.ff
2 3 9 U s 2 3 5 2Y 6
I S K I {T Y P E HSFI4?58
(e)
4-2
Pulse Transformer of 10 kW TR Unit
jur_
E*"!
aFP*'u';;* MADE IN JAPAN
(d) Fig.4.1.1.3
Fig. 4.I .I .2
gl*
Scanner Connection Board (S CON)
M D - 3 2 I 0/ 3 2 2 0 S e r v i c e M a n u a l - O 1
4 . 1 .2
I'IRT-134 (l'lD-3220)
( 1 ) HV short pulse (SP) (a) Modulator 229U2536L
W a v e fo r m i s s a m e a s m T - 1 3 3.
E5: TX trigger (b) Pulse transformer T1 Pin #6 (YEL): SP to magnetron
Waveform is similar to I"RT133, but the peak voltage is about 7.8 kV.
(2) HV long pulse (LP) (u) Modulator 229U2536I
Waveform is same as MRT-133.
E5: TX trigger (b) Pulse transformer T1 Pin #6 (YEL): LP to magnerron
Waveform ls similar to MRT133, but the peak voltage is about 7.B kV
(3) HV charging waveform (c) Modulator 229U2536I E6: H.V. charging (4)
Waveform is
same as
MRT-133
See para . 4. 1 . 1 ( 3 ) .
AZI pulse Scanner connection (S CON)
Waveform is
E3: AZI input & E4: AZI output
See para . 4. 1 . 1 ( 4 ) .
same as
MPT
r r.t\ l._
1
l- JJ
"?
Checking points INDULATOR U2
0r 02 f{VRlX-408lfvp-lX-{08 RI
lil[GluETRo[ 1?/rfr/ 25rlV TYPE E i ' , 5 1R,
Fig. 4.l .2.1
Pulse Transformer of 25 ktl TR Unit
M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - 0 1
Fig. 4.L.2.I
25 kW Type Modulator
4-3
4.2
Display Unit
4.2.1
Power suppty (MD-32f 0/?ZO-6000)
(1) Swilching waveform (a) Swltching transistor
r Q1
GaLe: Input
L
OV
ib
X scale: 5 psecldtv f scale: 5 V/div
I
r
t
fr
t
I
(b) Switching Lransistor Ql
\
Drain: 0utput
T
OV
I
scale: 5 psec/dl_v I Y scale: 5 V/div (2) T1 secondary square wave
t -l
(c) +50 V fullwave rectifier
I
l* n
F
D9 anode: Input scalet l^p:"c/d:_v I f scale: 50 Y/div (d) Switching transistor
l_
OV
-l
Ql
I 'F
Dl1 anode: fnput X scale: Y scale:
(a) Ql (b) Ql
5 psec/dl-v 50 V/div
t_Ll__i L_l L_.lL__l Lli_J --1 I II I
I
I t. ---5;
---; ]t --..; - *
(.) D9 (d) Dll
l-l
I
Fig. 4.2.1
4-4
, o"
r -5; o
e
o,o
P o w e r Supply MD-321.0/3220 Service M a n u a l - 0 1
Logic upper (1.[D-3210-7000)
4.2.2
Signal from control
panel I
(u) Data transfer
n
clock
ICSE#I2: RCK
l
X s c a l e : 5 0 F S e c/ d i u Y scale: 2 V/div
r
(b) Data signal
a T I T T I I
t:
tr n
i 1
llr tl tl ll_U]
ICBE #I4: PDT X s c a l e : 5 0 p s e c/ a t , Y scale: 2 Y/div Checking points
(a) IcsE #12
r:_l triar tr
tr.(llt
z:+l-l:+f--l )rialtr tr ia air
7ar(1ti
rr rc r tt
)ri( lrt
I
- r 1
- -
ti.(
tracr)r
7
;,
|
|
^irr"
;
'.ic),, i,.",rr\
Fig. 4.2.2 4.2.3
ltt
t.l
tlrtir!
rri(!'.
'ri.r'r
3
l:::ii:
.
1
Logic Upper
L o g i c l o w e r ( M D - 3 2 f0 - 7 1 0 0 )
(1) Synchro signals (a) Vertical
synch
TP5: VD X s c a l e : 5 0 p s e c/ d ' t u Y scale: 2 V/div (b) Horizontal synch TP4: HD X s c a l e : 5 0 F S e cI d : . _ v Y scale: 2 V/div MD-32I0/3220 Service Manual-O1
-l
I
L
Jt IHH JLIL tl tl ILlJlJtJI
II il
4-5
(2)
Video signal (b)
Lo CRT unit
HorizonLal
synch
TP4: HD X scale: Y scale: (c)
5 pse c/ d:_v 2 V/div
CRT video
R 1 3 2( J 7 1 0 5 )
llrll ilhrr illlr'
X scale: 5 psec/div Y scale: 0.5 V/div
illlnnrilllrlllh llnr llrrrl
(3) Video input from antenna (d) Trigger pulse R1: TRIG
\
X scale: 0.5 psec/d:v Y scale: 5 V/div (e) Vldeo inpur I
Q 2 b a s e : V I D E OI N
\f
X s c a l e : 0 . 5 t r r s e /cd i v Y scale: 1 V/div
(4) src (d) Trigger pulse
I
R1: TRIG X s c a l e : 0 . 1 m s e c/ A i u Y scale: 5 V/dtv (f)
L
rv
sTC D5 cathode: STC X scale: 0.1 msec/dl-u Y scale: 5 V/div
(5)
Dlgital
-l-!
N--
I
vldeo
(d) Trigger
pulse
I
R1: TRIG X scale: Y scale: (g) Digital
0.5 FSec/dru 5 V/div
video
IC2L #7: DV7 X scale: Y scale:
4-6
\
I
0.5 psec/dtv 2 Y/dtv
MD-32I0/3220Service Manual-01
(6) AZI pulse
_l
(h) Azimuth input pulse R120: AZIP
F
I
I
X scale: 0.5 msec/div Y scale: 5 V/div (i)
Mulriplied
l-
I IL
I
AZI pulse
rl
i
IC6T #I3z AZI
_1, I l j L] l__l_t
X scale: 0.5 msec/d:.v Y scale: 2 V/div
I
I
(7) Tansfer signal from LSI to RAM
n
(b) Horizontal synch TP4: HD X scale: 5 psec/dl_v Y scale: 2 V/div (j)
Video transfer signal ICBA #15: SPLS X s c a l e : 5 p s e c ./ d t v Y scale: 2 V/di-v
(8) Rowaddress selection
t l
I
(j)
Video transfer signal
U t^t
ICBA #15: SPLS X scale: 100 nsec/div Y scale: 2 V/div
+a I I -L"f^lf tJ-_tJ- L
ICSA #L4: RAS X scale: 100 nsec/div Y scale: 2 V/div
( 9 ) V i d e o R A Mw r i t e (j)
q.
1
(k) Rowaddress selection
l
1
/n
I
r
enable
Video transfer signal ICSA #15: SPLS X s c a l e : 1 0 0 n s e c/ d t , Y scale: 2 V/di-v
,i
_ I
lt
I
I
(*) Write enable signal ICTB IO 7L #I4Z WE X scale: 100 nsec/div Y scale: 2 V/div
M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - O l
IJJ
LI 4-7
Checking points
50
L-/
v
IP64
s
t
l
tt tt : | t t
t
=
l
t
l
tnr
n
t
t
| t
t
l
l
r
l
/11X, I l T -
.
f
\_-/ ;
J
t
I
l l
t
lr-
LLrr
ll Inl H *
l.'l
g
!
- [l
t-l
o u
"
r - l
r
l
l
|
l
l
l
|
-
l
:
l
l
r
I
-'
t - ! t
Ld :
I
[-ol
; | . - - - 1
Tr tl
-
'
l
l r l l - , lnl - lnl -
l
l . l l .
lt l t st l l l :
- I
l -l l l -r lnl lnl
R
-P I
l l t
l
-
l
tt ll r t
I
t
t
l
I
L
tI Il
L J .
;'.'_ ; ;
o
o
Cl?O
-
-lF
I
t l !
IU
q
g 3r-r
'll: [l l.-l t
" l rl
l
t
l
l
- l n |i
t
l
l
|
l
l
t
;
t
l
t
l
t-t t t
c
t l t
s tt
u l l ut l - . ' - l l - . r -l
l
l
l I n l - l n l - t.nl
-l I crsz
U
t--l t t
I l - ' LT | | | | l n l
-r
I
qi:
s
U
l l " lt 1 t 3
? ,:.-
B
I
m
crrs E
lf
<
t n
l
tt n l l -r
I
l
T
r
n n I t l t
1
r
r-r l t t
l l . l ll C I I l - ! T l-l |"U
l
N
f
-
n nntl t t t l t t t
n r-t
t t t l | | t l
l l s l | l|
| L t l t | | r l I t r t lr l l l l l l l l . l n l l.nJ Lrr.l p l n l EtdE I
l
3
I
rx,-
_ \|.i,|'.l*v
ora*-o3v-\
031,/-\
o.J={ o.r){ ^-">:<'!:1 '
l l s l --l E l l I
l r - l l ln | - hJ
-
r - l
I
l-oj
:rr: lJ TI
&
D+r'
p{ o
-
u
tl - lt s' nl s l T r T-t l l
-l-l
tJ-Jd
oaE u o o c{E
034'-\
o:.){
-\
.
sp I'
:
o F
l
I t l tt || i | l | |t t| ll || || tt l l. l l l l l l l l i 3
(h) Rl20
Eri.l!.!$*.. JPzt-, 6ii r.x :pr[-l
l
l I I I
L-.1
l
Ld
l l
t
t l l l e l l l r l lnl I + l
I
t t
l l
tt
I
E lI t l g N Lt Jl H I I U t l n l a l a t
rl
T -t l ll t
TI
: -. t--l
T-l t l
l
l
tnl
LI-U
(.) R132
ol
:
|
@ F
l
t
t{
t t _ t l
T
(a) TPs
l
T
v d
l
l l l l " l l
l l - r - l | - lnl lnl
:X
r l l r l I tI lt l "l tI r'l l l ll - 5! l l II
-
r" tl ll*":
l l
g r-l
a ^
:- r l l - l l I t : t I 6
N
)
l - l
t
'Y
d
(
I
ln I
T-l
l.nj - lnj
(b) rP4
t t t
l l l l n l l ll l l l l| -lr - I; Il l It l t : t l Il
:
(i) rc6T #13
-
t
t t t t t t
p
c
lln
)
l
lnl
r---l
BB; AR 3 7
a
(
l " l r
t
l
. :
q
9 i
E
l
tilg,35
3
N m
I
, ct, 5 ,s. l7^\ i-\
Jr fFr.rl. *-:7-\ c5r
attu\-/
nn TY.V .Y,.Y
.
u D{'
1 1
g
1 i
"1r
!'(
-1r
--__o}4
-prH N l"l=|?fi catt
ta7 o l c l 5S a9
F---15-___r_i
Fig. 4.2.3.I
4-B
Logic Lower (I/2)
IO/ 3220 Service Manual-Ol I'1D-32
Checking point,
continued
E x
F
1
-
3
-
H
o -
3 H
I I t-l t-l t-t t-t t-l
t
l |
I
l -r-
l
|
|
l-.r-
|
l
|
rr
|
r
r
-!
|
|
r
|
-!
r
I
l
t
r
l
l
lt t tt ln
I
- lnl - lnl - lnl - lnl - lnl - lnl L K J H G F E D C B pPDr?z7.
:Q
l
s l l n l l ; l l n l l x l l ; l ttl r l l r l l ; l l ; l l r l l ; l l I -r-
TP6
H
I l l l l r
9
(m) ICTB ro 7L #I4 each
A
X tO
(j) rc8A #ls
(k) rcsA #r4
n
6
ts !
r
3
r
n
s
H
T
3
f
*
l
?
3
n
n
x
I
H
n l l nl l nl l n n l l d l ll l el l l l s l l l el l l G l',l*H [-l*[.][,]+H*Lju -
i
i
r_.n r-r F
U
I
l t i t i t t t t t i t t t t l r i l t t l I l t r l l "r t l
l l i i l s| | I l l l l F ; l Il I l_l t_l rnr Ltr -J LIIJ
l
L-J
i
:
::l' i; g :
t
{l *
t
l
l
-
v l l "
.:-
I
i l
i_.
l
|
r'b^o-
l \d - 'l l c tr rf
-'A -<' -l_u
|
'..V lo: l-l f
J^
+
1
_,-_| | i- t+il ldl t I N
u
r
u
I
l-c1.8
JIF
rr;
t
t
I
|
|
o
-.1
"
N
h
\
(") \
Q2 Base
tEq
,. r--r d'' t-C'l5\ , t, .\_-/ : . C l a T
9
l @ r {
d
I
)-i
F ( 9
I
I
(e) rCzL#7
l;/-\ )ta
. -rf-\, | | | 1",. , r o r ' ' Jc t s :ir -t lr ! 3 l $ l t o . p . F t '
/
)15/z\
i ',.F{ !;li
|
f
)16l-\
; r l _ l tl'-' lo , : ,-. , r ( l l ; , & 1r-l , ; lr
+'u
D5 Cathode
(,
" ,I l ( l ,
(f)
t.
T
@
; r' : rLf \ r A , - 3
c
Rrg
,
i-rz
/'\-)-
lI
tl t t l l .',ii -_. :;l .--1lgJ-
(d) Rl YR? VR6 YRs VRl ruroxrrr !!II! I rntsxdp I lcffrrasrll tr xL.Y| -l!e iJ YR9
VR8
Fig. 4.2.3.2
M D - 3 2I O / 3 2 2 0 S e r v i c e M a n u a l - 0 1
VR3 I t{
_([YfL L1J!}J
VR?
V RI I
i
Logic Lower (212)
4-9
4-10
I t l D - 3 2 I O3/ 2 2 0 S e r v i c e M a n u a l - O l
4-l 0
I " 1 D - 3 2 I 03/ 2 2 0 S e r v i c e M a n u a l - O 1
5.
REPLACEMENT OF MAJOR COMPONENTS
5.1
Antenna unit
When replacing any component of the antenna unit, be sure to turn off the power completely, and take out the antenna drive motor fuse. Place a notice like ttAntenna is Under Inspectiontt near the power switch of the display r so that nobody turns the power on carelessly. Referring to Fig.5.1, loosen each four (tota1 eight) front and rear antenna covers. and remove covers.
Cover
screws of
+
+
(MD-3210) MRT-133 Fig. 5.1
D i s mo u n ti n g
the
Bow
Bow
F i x i n g s c r e t ^ t( 4 ) + ( 4 )
5. 1. 1
fixing
(MD-3220) MRT-134
l.[RT-133and I'iRT-134
trn a s m i tte r/recei ver
(TR ) uni t
(a)
At first disconnect The TR unit is mounted rear inslde the antenna unit. ( a ) . F i g . 5.1.1 connectors J1 of cable W1, and J4 of \12 shown in (b) Remove Lwo fixing screws of lhe TR unit. (c) Take out the unit as shown in Fig. 5.1.1 (b).
Fixingscrew (2)
J4 of Wz T R u n it of
t.J1
(a) Fig. 5.I.2
5. I . I
(b) Dismounting Transmitter/Receiver
Replacement of TR unit
(TR) Unit
components
F i g . 5 . I . 2 . I i l l u s t r a t e s t h e 1 0 k W T R u n i t f o r M R T - 1 3 3( M D - 3 2 1 0 ) ,a n d F i g . 5 . I . 2 . 2 r h e 2 5 k W T R u n i r f o r M R T - 1 3 4( M D - 3 2 2 0 ) .
M D - 3 2 L 0 / 3 2 2 0S e r v i c e M a n u a l - O 1
5-1
( 1 ) M a g n e t r o n I M S F I4 2 5 8 ( 1 0 k \ t / ) o r 8 3 5 6 4 A ( 2 5 k W )] CAUTION (a)
(b)
(c)
Keep steel or iron tools such as wrench and screw drivers more than 2.5 cm apart from the magnetron. Use nonmagnetizing screw driver for replacement of magnetron. Although the magnetron looks so1id, it has delicate internal structure. Handle with care and do not apply heavy shock. After the magnetron is replaced, be sure to preheat the heaLer of new magnetron at least 20 minules on STANDBY condition.
(a) (b) (c)
Place the TR unit with the magnetron side up. Cut off Lhe tie-1ap fixing the nagnetron 1eads. ( nroa., ^.nd ye11ow) from the pulse Desolder two magnetron lead wiro. transtormer. (d) By removing four fixing s c r e w s , disrnount and take out the magnetron. ( e ) Fix a nel^/ magneLron to the chassis, and solder Lhe yel1ow lead to pin #4, and green lead to #6 of Lhe pulse transformer. In order to avoid corona discharging, the magnetron leads should be cut to possible minimum length and the wire ends must be correctly to soldered terrninals. (f) Referring to para. 3.2.1, carry out the tuning adjusLment.
CircuLator L i m ' ti e r P uL s e t r a n s f o r m e r C o v er
Modu Lator
I F u n ' it Diode 01 Diode 02
R e s is t o r R 1
F cover
M a g n e rt o n Fig. 5.1.2.1
5-2
Components of 10 kW TR Unit I ' l D - 3 2I O/ 3 2 2 0 S e r v i c e M a n u a l - 0 1
(2) Modulator 1239U522368( 10 k\,{) or 229U25361 (25
kw)l
( a ) R e fe r r i n g t o F i g . 5 . I . 2 . I a n d Fig. 5.1.2.2, disconnect E1 to F,4. In case of 25 kW modulator, also disconnect J3 and J4. (b)
J4
Remove seven fixing screws of 10 kW modulator the or nine screws of 25 kl{ modulator. then take out the board.
25 ktl r|TR uni t
E1 to E4 P uL s e t r a n s f o r m e r Charging choke
M o d uL a t o r
Ci r c u L a t o r Limiter
"1 C o v er MIC
Spacer
Diode Diode R e si s t o r
o1 o2
u n ' it
R1 I F cover
Fanmotor
f v l a g n erto n
Fig. (3) IF unir
5.I .2.2
Components of 25 kW TR Unit
(239U525r2)
( a ) R e m o v et w o I F c o v e r f i x i n g s c r e w s a n d r e m o v e t h e c o v e r . (b) Disconnect J2, remove six fixing screws of the IF unil, and then Lake out the board. Mount new unit in reverse steps. (c) Whennew IF unit is mounted, carry out the tuning adjustment r e f e r r i n g to Dara. 3.2.I . (4)
MIC (NJT1946 or S-RX34)
(")
Remove three fixing screws (NJTI946) or four (S-RX34) of the MIC cover, and dismount the cover. (b) Remove four fixing screws and nuts of the MIC, then take out the MIC. Mounl new MIC in reverse steps. (.) When new MIC is mounted, carry out the Luning adjustment referrlng to para. 3.2.I .
MD-32I0/3220Service Manual-Ol
5-3
5.1.3
Replacement of S CON (scanner connection)
board
The S CON (scanner c,onneclion) board j,nterfaces the antenna and displ.y, as well as other boards in the anIL also contains the SHF tenna unit. As shown and AZI reforming clrcuits. i n F i g . 5 . 1 . 3 , f o l l o w i n g c o n n e c t o r s N y L o nc L i P are mounted on Lhe board for transvarious signals. ferring
J2 J1 J3
S C O Nb o a r d
E I : Interconnection E2: T 1 l l
.
J2: J3:
of antenna and display with anlenna c.able. Sends out drive motor power and rec.eives SHF input signal. Interface with IF unit Interface wlth modulator board fnterface with AZI pulse generaLor at the boLtom of drive motor
Replacement is
2
il
Fixing screw(4)
ntenna cabLe
done as follows:
Fig - 5.1.3 ( 1 ) R e f e r r i n g t o F l g . 5 . 1 , o p e n the bow side antenna cover. (2) Remove all wires of El and E 2 . DisconnecL connectors J1. J2, w e 1 1 . J 3 , a s and (3) Remove four fixing s c r e w s and take out the board.
Replacement of S CONBoard
'g
B oL t ( 4 )
Bracket
(4) Whennew board is mounted, conf i r m t h a t J U M P E Rw i r e i s s e t t o the same slatus of old board. 5. I .4
Replacement of motor blush
When the motor brush is worn, of them should be renewed.
pair
(1) Referring Lo Fig. 5.1, open the bow side antenna cover. (2) Referring to Fig. 5.I.4, unscrew both sides motor brushes and replace with new ones. 5. I . 5
Rep l a c e me n t
of
mo to r
f4oto r
( 1 ) R e f e r r i n g t o F i g . 5 . 1 , o p e n t h e P h o t o - in t e r r u c t e r bow side antenna cover. ( 2 ) R e f e r r i n g L o F i g . 5 . 1 . 3 , r e m o v e C o v er wires of Ei and F,2. Disconall nect connectors Jl, J2, and J3, as we11. (3) Removeall nylon clips for cable and binds of motor wires. F i x ' in g s c r e w \ (4) Remove four fixing bolts for the bracket and take out the brackeL F i g . 5 . I . 4 Replacement
Fixing s c r e r . /( 4 )
Nr:r:n
5-4
Brush
of
Motor
M D - 3 2 10 / 3 2 2 0 S e r v i c e M a n u a l - O l
together with the drive motor. Detach the motor from the bracket by removing four flxing screws. When replacing the motor, detach the photo-coupler of AZI pulse generator by removing two fixing screws of the cover, and then mount the generator to the new motor. (7) Take reverse steps of the above procedure for assembling new motor. In insert a sheet of paper beorder Lo fix the motor at correct position, the fixing bolts of tween the main gear and pinion before tightening Carefully adjusl the bracket. Lhe gearing so that the paper 1s taken out by rotating by hand, and then securely fix the bolts. the aerial
(5) (6)
5.2
Display
Unit
Control panel (MD-3210-7200)
5.2.1
The conLrol panel MD-3210-7200 is built in a Lilting type case unit. The unit is connected to the display wilh a 75 cm long standard cable. The uniL can be dismounted from the display uniL enabling up t o 75 c m l o n g r e m o l e c o n L r o l . T h e cable can be extended up to five meters on optional order for I ono distance remoLe control. Referring Lo panel control as follows:
Fig. unit
5 2.I.I, the dismounLed
-.i ^ L 5
( 1 ) Disconnect
display the side uniL connec-tor of the control cab1e. ( ) \ Remove two side fixing screws and take out the unit.
W Fixing screw (?) C o n tr o L p a n eL unit
The fronL frame and rear cover encapsulate components. the circuit C a bL e As shown in Fig. 5 .2.1 .3, the memConnector brane sheet with track ba11, chaspanel with 3 sis, board of control Detaching Control Unit F i g . 5 . 2 . L. l switches and 8 controls are assembled lnside the case. For disassembling those comDonents. fo11ow the following procedure: (3)
Remove eleven knobs of the controls and switches as fo11ows.
(a)
(b)
(c)
Carefully remove the cap of each knob wlth a cutter blade or 11ke. See Fig. 5.2.I.2. Loosen the center hexagonal head screw by rotating counlwlth a box spaner-clockwise ner or screw driver and remove the knob. Take out the packing.
l" iD- 32L 0 / 3 2 2 0 Se rv i c e
Ma n u a l - O1
Fig. 5.2.1 .2
R e m o v i n gK n o b s 5-5
( 4 ) Remove eight
( s )D i s c o n n e c t
(6)
fixing screws of connectors J720I,
the rear cover and open the unit. J7202, J72O3, and J7204 on the
control panel board. Remove ten screws fixing panel board to Lhe chassis, the control and take out the board. The track is disassembled by removi-ng four ball screws fixing the component to the membrane sheet frame. R e ar c o v e r
R e ar c o v e r
C o n tr o a L b o a r ' d C h a s s si
Fixing scretJ
"%a 6o
5.2.2
Logic
upper
5.2.1.3
sR ilV
Gc
Knobs and packings Cp
Fig.
TrackbaLl
d
M e m b r a n es h e e t Fr a i n e
Disassembling
(l'[D-3210-700O)
Control
and logic
The logic boards are mounted on the boards are carried out as follows:
lower
right
side
Panel Unit (t'lD-3210-7100) of
displa]'.
Dismounti-ng Lhe
(1)
Referring to Fig. 5.2.2 (a), remove 14 fixing screws, and open the display cover. (2) Referring to Fig. 5.2.2 (b), disc.onnect J7001 of the logic upper. When optional gyro/tog interface is used, also disconnect J7OO2. (3) Remove nine fixing screws of the logic upper and take out the board.
upper
J7 0 0 1 D ' is p La y c o v en
17105
J7002
J7103
F i x i n g s c n e w( 4 ) (a)
J 71 0 2
Ioyer (b)
Fig. 5.2.2
s-6
Dismounting
Logic Upper/tower I ' l D - 3 2I 0 / 3 2 2 0 S e r v i c e M a n u a l - O l
CAUTION The logic upper is assembled with a back-up batlei:y. Do not place the board on conductive materials such as metallic olate or foil.
(4) Disconnect J7IO2, J7103, J7I04, J7105, and J7106 of the logic lower board. ( 5 ) R e m o v en i n e s p a c e r s a n d t h r e e f i x i n g s c r e w s o f t h e l o g i c l o w e r a n d t a k e out the board. When the logic upper (MD-3210-7000) is replaced with new board, setting of three DIP switches SWl, SW2, and SW3 should be checked. If the setting differs from previous board, restore the setting, if necessary. Functions set by DIP switches and their standard settings are listed in para. 1.5.2. When the logic lower (MD-32I0-7 100) is replaced with new board, settings of jumper pins should be checked, and corrected five if necessary. Functions and initial setting status of those pins are explained in para. 1.5.1. Furthermore, ten controls and two switches are assembled on logic lower board as shown in Ffg. 3.1.1. Adjustment of those controls as well as setting of switches should be made when the board is renewed. The ad justment includes:
(a) ( b) (c) (d) (e) (f) (g) 5.2.3
Pulse repetition frequency (PRF) Tuning Video input 1evel Preset gain STC Trigger delay S H Fa n d b e a r i n g
See See See See See See See
p a r a . 3 . 3 . 3( para. 3 . t . 2 para. 3 . 3 . 3( para. J . I . J para. 3 . r . 4 para. 3 . 1 . 5 para. 3 . 1 . 6 -
1
1) 3)
-
Power supply (lID-3210/ 3220-6000)
The power supply board is rnouned inside board is carried out as follows:
the
rear
pane1.
Dismounting
the
R e fe r L o F i g . 5 . 2 . 3 . I ( 1) Remove four fixing gyro/Iog interface
screws of the cover for terminals of the optional board on the rear panel, and open the cover.
O p ti o n b o a r d t e r m in aL c o v e r
T e r m in aL c o v e r fixing screw(4
J600
0ption board t e r m ' i n aL c o v e r fixing screw(4)
J6004 J6005
Powerconnector
T er m ' n i a L c o v er
R e a n p a n eL
E a r t h t e r m i n aL
Data i nput c o n n ec t o n
R e a r p a n eL f i x ' i n g s c r e t ^ r( 1 0 )
Fig. 5.2.3.1
Disassenbling
MD-32IO/ 3220 Service Manual-Ol
Display
Rear Panel 5-7
(2)
(3) (4) (5)
Remove four fixing screws of the terminal cover on the rear panel, and open the cover. Disconnect the antenna cable connectors J6004. J6005. and J6006. Disconnect the power cable connector and earLh terminal. Disconnect the data input connector from optional navigator, if used. Remove ten fixing screws of the rear pane1, and s1ow1y open the pane1.
R e fe r t o F i g . 5 . 2 . 3 . 2 .
( 6 ) D i s c o n n e c t c o n n e c t o r s J 6 0 0 1 , J 6 0 0 2 , a n d J 6 0 0 3 . I n c a s e o f l q D - 3 2 2 0 ,a l s o dlsconnect J6009. (7) Detach the rear panel from the display unit. ( B ) F i n d t h e p o w e r s u p p l y b o a r d r n o u n t e do n t h e r e a r p a n e 1 . D i s c o n n e c t t e r minals E1,F.2, E9, E10, E1l, and EL2, as well as connector J6007. ( 9 ) R e m o v ef i f t e e n ( 1 5 ) f i x i n g s c r e w s o f t h e p o w e r s u p p l y b o a r d , a n d t a k e out the board from the chassis.
D ' is p La y unit J6 0 0 9 J6 0 0 7 J5 0 0 1 J6 0 0 2
E1? E10 E11
E9 J6 0 0 3
Fig. 5.2.3.2
Dismounting
Power Supply Board
When the power supply (MD-3210-3220-6000) is replaced with new board, the switching regulator oscillating frequency, +100 V output 1eve1, and magnetron heater current should be adjusLed. Refer to para. 3.3.1.
5.2.4
C R Tu n i t CAUTION EHT (extra high tension) charge may be remained on the CRT anode cap. Prior to dismount the CRT unit, discharge the anode voltage wlth a clip cord or like.
(1) Removethe display cover by removing L4 fixing screws. (2) Open the r e a r p a n e l w i t h p o w e r s u p p l y . I R e fe r t o p a r a . 5 . 2 . 3 . l Disc onnect J6001, J6oo2 and J6003 of the power supply and derach rhe rear panel from the display unit.
5-8
M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - O 1
(3) Find two circuit boards, the CRTmain board PWD1050A (bottom), and CRT n e c k b o a r d P W D 1 0 5 1(AC R T s o c k e t ) i n s l d e t h e d i s p l a y u n i t . F i g . 5 . 2 . 4 . I s h o w s l a y o u t o f t h e C R Tc i r c u i t b o a r d s . (4) Disconnect connectors J7105 and 7LO6 on the logic lower MD-3210-7100. Pu11 the cables onto the CRTmain board inside the unit. (5) Disconnect pin #16 of the CRT neck board and carefully remove the CRT s o c k e t f r o m t h e C R Tn e c k . (6) Disconnect connecLor P46I of the cable to CRTdeflection yoke. ( 7 ) D i s c o n n e c L t h e C R Ta n o d e c a p . CRT Fr " o m L o g i c L o w e r J 7 1 0 6
\l
C R Ta n o d e c a p
P201
t P202
M o u n t i n gp L a t e P461
F r o m L o g i c L o w e rJ 7 1 0 5 V ' id e o ' in p u t
J6 0 0 1 J6002
CRTmain board
Pin #16 To J6003 CRTSocket CRT neck board
o
3 PoHer supply o F i g . 5 . 2 . 4. I
\
e a r p a n eL
Layout of CRT Unit
Boards
(8) When optlonal gyro/Iog interface board is mounted on the left hand side of the display unit, detach the board. Removefour (4) fixing screws of the mounLing plate, referring to Fig. 5.2.4.I. Carefully take out Lhe mountlng plate with CRT main board and neck board through the left hand side openning of the display chassis as shown in Fig. 5.2.4.2. (9) Remove twelve (I2) fixing screws of the CRT main board and deLac.h Lhe board from the mounting p1ate. (10) Referring to para. 5.2.I, dismount the control panel unit. Dismount the bracket by removing five (5) flxing screws. (11) Remove ten (10) screws fixing the front frame to the display chassis. Securely hold the front frame sure that the CRT is so heavy. (I2) (13) (14)
and
carefully
draw
it
out
with
CRT. Be
Place the CRT with the front face of the frame bottom. Remove four (4) fixing nuts of the CRT at its corners, and take out assoclated washers. Slow1y lift up the CRT and detach from the front frame. Fo11ow the reverse procedure for mounting new CRT and CRT boards.
M D - 3 2 1 0 /3 2 2 0 S e r v i c e M a n u a l - O l
5-9
C R Tn e c k b o a r d Hncde cao
Cush'ion
€ F i x i n g s c r e b r( ? )
C R Tm a i n b o a r d Fixing screw @/U; D i s p L a yc h a s s i s
l'lounti ng p L a t e
R e ar p a n - ' L
Fr o n t f r a r n e
-I F ' ix l n g s c r e t J
Fig. 5.2.4.2
s-10
(1 0 )
Dismounting CRT and CRT Boards
M D - 3 2I 0 / 3 2 2 0 S e r v i c e M a n u a l - O l
6. TROUBLESHOOTING (IC), iL circuits of this radar are composed of integrated As rnost circuits components with usual instruments defective to locate difficult is rather the system in In order to restore or multi-meter. such as an oscilloscope section explains this as possible, as quickly to normal operation trouble for based on replacement of printed flowcharts lroubleshooting and tables c-ircuit boards. frequency counter, measurement, prepare an oscilloscope, For troubleshooting with internal resistance of 20 kn/V DC, according to reand/or a multi-meter spective descriptions. 6. f
Troubleshooting
by Observing
Display
sometimes the cause of malfunction If the radar shows abnorrnal operation, observing images shown on the CRT of the display can be found by carefully paragraph for analysing Lhe in this and tables uniL. Refer to flowcharts faults. (1)
Radar does not
come oo, although
P O W E Rs w i t c h
is
pressed.
S T A R T S h i p ' s p o w e rs o u r c e
i s s h i p ' s m a i n sv o l t a g e + 10%of normalvalue ?
I s t h e m a i nf u s e blown ?
S h i p ' sm a i n ss u p p l yi s t r o u b l e .
Yes
Is the voitaee between J 7 1 0 4# 1 a n d# 2 o f l o e i c l o w e r MD-3210-7000 as belolt? POI.JER switch pressed:0 V P0WER switch open: 12124Y Yes
PowersupplyMD-321013220-6000 F E TQ 1t o Q 4 , o r d i o d eD 1 t o D 1 9 , D33,D34maybe defective. ControlpanelMD-3210-7200 C h e c kf o r c o n t i n u i t yo f c a b i e s . Checkthe membrane sheet. PowersupplyMD-3210/3220-6000 C h e c kE 3 - E 4& E 6 - 8 7c o n n e c t i o n s . IC3 and its related components may be defective.
( 2 ) C R Ti s n o t 1 i t u p
S T A R T s u p p l yMD-3210i 3220-6000 Are +100V and +50V normal?
M D - 3 2 L 0 / 3 2 2 0S e r v i c e M a n u a l - O 1
D4 to D11maybe defective. +100Vand/or +50V1ine maybe shortcircuited to ground.
6-1
7
CRTunit DoesCRTfilament l isht ?
N e c kb o a r di s i m p r o p e r l yf i t t e d . CablebetweenCRTunit and J6003 of powersupplymaybe defective.
Yes Is waveform at J7105 #1 as shownin para. 4 . 2 . 3 ( 2 ) ( c?)
C R Tu n i t Yes I n p r o p e rf i t t i n g o f t h e n e c kb o a r d . CablebetweenCRTunit and J7105 o f l o g i c l o w e rm a yb e d e f e c t i v e . M D - 3 2 1 0 - 7 1V0R0gm a yb e d e f e c t i v e .
Are +12Y, -72 V and + 5 V s u p p l i e sn o r m a ? l
PowersupplyMD-3210/3220-6000 R e s p e c t i vree c t i f i e r c i r c u i t s .
Yes
C o n t r o lp a n e lM D - 3 2 1 0 - 7 2 0 0
Are voltagesof J7104#7 to #10 as shownbelow? B r i l l i a n c ec o n t r o l f u 1 l y C C l l l0: V fully CW:5 V
MD-3210-7200 maybe defective. I m p r o p ecr a b l e c o n n e c t i o n . Logic upperMD-3210-7000 Logic lowerMD-3210-7100
Yes
Logic upperboardmaybe defective. Videooutput of logic lowerboard maybe abnormal. Checkcable between J7001and J7106. (3) Abnormal display on CRT No. 1
Trouble
Cause
(a) Picture on CRT is not stabll:.zed and moves up/down or left/right contin- (b) uously. (.)
Action
Improper setting of CRT size
T u r n O F F S W 3# 7 o f logic upper.
Improper setting of horizontaT- scanning
Set Jumper JP5 of 1ogic lower to 1,153.
Loose connection of cable between J7106 a n d C R Tu n i t .
Securely connecL the cable plugs.
(d) Improper adjustment Adjust correctly. o f V . H O L Da n d H . H O L D o f C R Tm a i n b o a r d . (e) Fault of logic
2
Marker rings in the picture are distorted.
lower
(a) Improper adjustment AdjusL correctly. of V.SIZE, V.LINE, S . C O R R Ea, n d H . W I D T H . (b) Improper adjustment o f C R Tn e c k c o r e s .
6-2
Replace the board.
AdjusL correctly.
M D - 3 2 I 0 /3 2 2 0 S e r v i c e M a n u a l - 0 1
(4) IAZI FAILI i"
displaYed.
S T A R T
Yes Is the voltase approx. 24 VDCbetweenJ6006 # 5 ( + )a n df 7 ( - ) ?
Doesthe antenna rotate ?
Antennamotoris defective. Motorbrushesare wornout. Antennacable is defective, or improperconnection.
Yes
Yes
Is the motorfuse blown ?
Checkthe motorandbrush. Checkshort-circuit of mot o r p o w e rl i n e . Yes
Is the voltase at J6001#13 as below ? M o t o r0 N : 0 V M o t o r0 F F : 1 2 U
PowersupplyMD-32I013220-6000 Q23to Q25maybe faulfv. impropercable connection betweenJ6001and J7102. Losic iowerMD-3210-7100
I s A Z I Ps i g n a l a t J 6 0 0 4# 9 of powersupplyas beiow ? A m p l i t u d e1: 2 V p - p Frequency:432Hz Yes I s s i e n a l a t I C 4 Z* I 2 logic lower as below A m p l i t u d e5: V p - P Frequency:432Hz
Yes
IC4Tmaybe defective. Antenna AZIphoto-interrupteris defective. P L Lc i r c u i . t o f S C O Ni s d e f e c t i v e . Antennacable is broken0r improper connection. L o e i c l o w e rM D - 3 2 1 0 - 7 1 0 0 I C 4 Zo r I C 5 Yi s d e f e c t i v e . J6001 improperconnectionbetween a n dJ 7 1 0 2 . Logic upperMD-3210-7000 C P Ua n d / o rp e r i p h e r a lc i r c u i t i s defective. J7101 Inproperconnectionbetween a n dJ 7 0 0 1 .
I
r-.* |
-r/
( 5 ) [ S I I FF A I L ] i "
displayed.
S T A R T
is SHFsienal at J6005#2 of powersupplyas below ? A m p l i t u d e1: 2 V p - p F r e q u e n c y1: p u ls e l 2 . 5 s e c .
Yes
MD-32I0/3220Service Manual-O1
Antenna P o s i t i o no f l e a d s w i t c hi s a b n o r m a i . Q1 of S CONis defective. Antennacable is broken0r improper connection. L o e i c l o w e rM D - 3 2 1 0 - 7 1 0 0 I C 4 Zi s d e f e c t i v e . J6001 Improperconnectionbetween a n dJ 7 1 0 2 . 6-3
(6)
even gain and video Poor sensitivity, STC and FTC suppression Lo minimum.
are
controls
Lo maximum. while
set
Control panel
S T A R T
Yes / R r . v o l t a g e s at every\vut
Impropercontact of cont r o l p a n e lc a b l e . V I D E 0c o n t r o l o f t h e c o n t r o l p a n e ii s d e f e c t i v e .
, 1, 4L t-# 7 o f I C Z L3 , A / D . t r " . . t . d 5 V ?t
Is the voltage ut, i/ J6004#2 as below \ 1 N o i s ei e v e l: 0 . 6 \ V i d e ol e v e i : 3 . 5
,l-,/
lNo
Controlpanei
I
No
re voltages a t J 6 0 0 4# 3 , \ Y . t il4, and #5 a s b e l o w? \ # ( G A I N )5: Vmaxto 0V min l4 ( S T C ) 5: Vmaxto 0V min I : Vm a xt o 5 V m i n / 5 (FTC)0 \
Impropercontact of cont r o i p a n e lc a b l e . Fault of respectivecontrols of the control panel.
Loeic lowerMD-3210-7100
No
Improperadjustmentof the a n a l o gv i d e oc i r c u i t .
,' / ^ Doestune metershow Yes t u n i n- e p o i n t ? '\
Logic lowerMI- 3 2 1 0 - 7 1 0 0 I ^ -
bu5
T n
rr
dlilp.
I
t
nlenna)
No Improperadjustmentof iogic lower. Improperadjustment of Log IF amp.
Go to Antenna L r o u b l e s h o o t i n6g. 3 . 6 .2
O per at ion Tf
T ro u b l e s h o o t i ng
C o n tro l
^nA12t.iona1 control out as follows.
of
the
radar
shows malfuncLion,
troubleshooLlng
is
carried
( 1 ) A U T OT U N E d o e s n o t
S T A R T
operaLe.
TUNa Ed j u s t m e nf itr s t i n p a r a . 3 . 2 . 1 . Try AUT0 Control panel
CanTUNE control select AUT0or l'lAN t u n i n gd i s p l a y ? Yes
TUNE c o n t r o l ( V R 4 )i s d e f e c t i v e . Yes
Is manuaituning o p e r a t i o np o s s i b l e?
Logic lowerMD-3210-7100 Doestuning indicator operate ?
Yes Adjustment of tuning cir* cuit is not correct. I C 5 Ri s d e f e c t i v e .
Loeic lowerMD-3210-7100 .M vol t,aee Yes I s TUNE I C 3 N ,I C 5 Ka r e d e f e c t i v e . at J6005#4 approx. 0 to 3.5V ? Antenna Tunemeterline is broken. L o g I F a m p . u n i ti s f a u l t y . 6-4
M D - 3 2 I O3/ 2 2 0 S e r v i c e M a n u a l - O 1
unit MD-3210/3220-6000 Power LoeiclowerMD-3210-7100 I s T U N E 'v0o i t a e e at J6005S3 aPProx. 22to30V?
Powerunit +35V suPPlYis faultY. Logic lower IC3Nis defective. Antenna
Yes
Improperconnectionof antennacable. na y L o g I F a m p . ,M I C ,o r M a g n e t r om 6 . 3 . t o R e f e r Para. be defective. (2) GAINcontrol does not oPerate.
S T A R T L o e i c l o w e rM D - 3 2 1 0 - 7 1 0 0 I s G A I Nc o n t r o l v o l t age at J7104#3 varies f r o m 5 t o 0 V?
Yes
G a i nc o n t r o l c i r c u i t Q 3 9 ,Q 1 6 ,D 1 0 , or related parts maybe defective. C o n t r o lp a n e lM D - 3 2 1 0 - 7 2 0 0 G A I Nc o n t r o l V R 1m a yb e d e f e c t i v e . Improperconnectionof cable between J7201and J7104.
( 3 ) S T Cc o n t r o l d o e s n o t o P e r a t e .
Logic lowerMD-3210-7100
S T A R T
VRz Improperadjustmentof I-STC-TETI
I s S T Cc o n t r o l v o l t age at J7104#4 varies from5to0V?
Yes
vm. Rererto s.z.s. anhrcTe-TT[El S T Cc i r c u i t Q 8t o Q 1 0 ,I C 1 Lo r r e lated parts maybe defective.
ControlpanelMD-3210-7200 STCcontrol VRZmaybe defective. Improperconnectionof cable between J7201and J7104.
(4) FTC control
does not oPerate.
S T A R T Loeic lowerMD-3210-7100 I s F T Cc o n t r o l v o l t ase at J7104#3 varies f r o m 0 t o 5 V?
Yes
F T Cc o n t r o l c i r c u i t Q Zt o Q 4 , Q 4 0 , or related parts maybe defective. Control panel MD-3210-7200 FTCcontrol VR3maybe defective. Improperconnectionof cabie between J7201and J7104.
MD-32LO/3220 Service Manual-Ol
6-s
( 5 ) V R Md o e s n o t o p e r a t e .
S T A R T ControlpanelMD-32i0-7200 DoesVRM0N/0FF switch operate?
I s s i g n a l a s b e l o w? 0N:0U/OFF:5V
Yes
point Measuring MD-3210-7200 Sl.l1 #3: Sisnal #2: Ground
(6)
ControlpanelMD-3210-7200 maybe defective.
Yes
ControlpanelMD-3210-7200 Is waveform of VRM encoderoutput as shownleft ?
EBL SltI1may be defective.
Losic upperMD-3210-7000
+ 5v - n
Yes Loeic upperMD-3210-7000 maVbe defective.
L
OV - J
Membrane sheet or its conn e c t i o nc a b l e i s d e f e c t i v e .
EBL does not operate.
S T A R T
DoesEBL0N/0FF switch operate?
Control panelMD-3210-7200 Is signal as below 0N:0V/0FF:5
point Measuring MD-3210-7200 Sltlz#3: Signal #2: Ground + 5V - n OV--l
Controlpanel MD-3210-7200 Is waveform of EBL encoderoutput as shownleft ?
EBLSW2maybe defective. Loeic upperMD-3210-7000
Yes upperMD-3210-7000 defective.
t l L
(7) Track ball
ControlpanelMD-3210-7200 maybe defective.
Yes
Yes
Membrane sheet or its conn e c t i o nc a b l e i s d e f e c t i v e .
does not operate.
S T A R T
Controlpanel MD-3210-7200 T r a c kb a l l i s d e f e c t i v e . Improperconnectionof track bali andJ7202.
Is waveform of track ball output as shown b e l o w?
Logic upperMD-3210-7000
Yes Loeic upperboardmaybe defective. point MeasurinB MD-3210-7200 Trackball #3, #4, f5, #6: Sienal #2: Ground 6-6
+5V O V
_Jl M D - 3 2I O/ 3 2 2 0 S e r v i c e M a n u a l - O 1
(8) Dimmer lamps cannot be turned 0N.
S T A R T Controlpanel MD-3210-7200 I s D i Ms w i t c ho u t p u t voltage as beiow ? 0N:0V/OFF:5V Yes
Membrane sheet maybe defective. L o g i c i o w e rM D - 3 2 1 0 - 7 1 0 0
DoesDIMMER voltage at TP1of loeic lower variescorrectly ?
D I M M Ec R o n t r o l c i r c u i t I C 5 P ,I C 3 N or related parts maybe defective. ControlpanelMD-3210-7200
Yes T r a n s i s t o rQ 1m a yb e d e f e c t i v e . Improperconnectionbetween J7201 a n dJ 7 1 0 4 .
Doesvoltage at common1ine of DS1to DSg variescorrectly ? Yes
6.3
Antenna
Troubleshooting
When it is estimated unit, troubleshooLing ( 1) Antenna does nol Follow (2)
Lapms DS1throughDSgmaybe blown.
that malfunction of radar is performed as follows:
due Lo Lrouble
of
antenna
rolate.
Lhe f lowchart
Poor sensiLivily
is
in
para . 6.L
(4) AZI FAIL troubleshooting
caused by Lransmtter/receiver
Lrouble
is
.
antlclpated.
S T A R T
PowersupplyMD-32I013220-6000 I s M O D .+S3 0 0V a t E 1 # 1 7O K ? S CON Yes
K Z o r Q 2 6m a yb e f a u l t y . Improperconnectionof ant e n n ac a b l e . Is l'lODfuse F3 of powersupplyblown ? P u l s el e n e t h i s n o t s e l e c t ed with detectionrange. L o g i cl o w e r : I C 5 V ,I C 4 T , Q 3 5 ,Q 3 6 ,Q 3 7 Powersupply M o d u l a t o rK: l , K 2 , K 3 MD-3210/3220-6000 Improperadjustmentof [TRl'-] V R 1 0o f l o g i c l o w e r . Magnetron heater constant ModulatorSCR/diode are dec u r r e n tc i r c u i t I C 5 , 8 3 2 , fective. or related parts maybe 10 kltl:Q9, Q10 defective . 2 5 k l t l :Q 9 , Q 1 0 ,Q 1 1
Yes
Is magnetron heater voltage betweenlead w i r e s6 . 3 V + 1 0 %?
MD-32IO/3220Service Manual-O1
6-7
/. DIAGRAMS
Diagram 7.1Gircuit DISPLAYUNIT J6006
ANTENNA UNIT
E1
1
22
2
VIOLET BROWN
3 4 ( 6 7
GND MAG(H)
BLUE GREEN
MOTOR +
RED BLACK BROWN
MOTOR
VIOLET
TUNE.R MOD.S
W-RED
+12V GND
8 I {n
W.GREEN
PINK
J6004 1 . 2 { A .+
VIDEO.G
SHIELD
VIDEO P S( M 1 ) P S( L )
CXGRAY W-GREEN GRAY
o
T R I GG. TRIG
7
P S( M 2 )
BROWN YELLOW
8 I
AZIP
GREEN
5
SHIELD
J6005 I I
GND
I
SHF
3
TUNE.O TUNE.M
4
VIOLET WHITE ORANGE
RED
(forexample wire VIOLET) : Thethicker Boldletters (forexample wire Plainletters vtotrr) : Thethinner
CHECKEDBY
TYPE
H .S h i n d o
MD-3210/MD-3220
PLAY |NTERCoNN ECT|oN D|AG RAM(ANTENNA-DIS
DRAWN BY
K.Saruyama DWG.NO.
I(ODENEb::ItrN*S MD-321 013224 ServiceManual-02
MD-3210-E.H001 7 -1
ADDRESS DECODER MAo-1I
A 0 - 19
MARKER V-RAM
CRTC HD634B4 Tr\ I U
GYRO I l F EXT VCK SYNC
P A NLE I NTERFACE
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MEMBRANE S'#I TCII
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V-RAM
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TI]RESHOLD OR COMPARAT CONT ROLER
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EXP ROTER CONT L.P.F ROLER CONT
R EXPANDE | | i i
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