SERVICE MANUAL
PSR-240/248
IMPORTANT NOTICE This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed that basic service procedures inherent to the industry, and more specifically Yamaha Products, are already known and understood by the users, and have therefore not been restated.
WARNING:
Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury, destruction of expensive components and failure of the product to per form as specified. For these reasons, we advise all Yamaha product owners that all service required should be performed by an authorized Yamaha Retailer or the appointed service repre sentative.
IMPORTANT:
This presentation or sale of this manual to any individual or firm does not constitute authorization, certification, recognition of any applicable technical capabilities, or establish a principal-agent relationship of any form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research engineering, and service departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefor, inevitable and changes in specification are subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributor's Service Division.
WARNING:
Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect to this buss).
IMPORTANT:
Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power to the unit.
PSR-240/248
Keyboards 61 standard-size keys (C1 - C6) with touch responce
Display Large multi-function LCD (backlit)
Voices
Amplifier 2.0W + 2.0W
100 panel voices (max. polyphony: 16) Effects
MIDI Dual (Included in Voice) Harmony/Echo (Included in Voice) Split (Included in Voice)
Auto Accompaniment 100 styles Fingering : Multi Fingering Sections : Intro, Main A/B, Ending, Fill x 4 Overall controls Tempo Multi Pad Transpose Tuning Accompaniment Volume Song Volume Metronome Volume
IN/OUT Auxiliary jacks PHONES/OUTPUT, DC IN 10-12V, MIDI IN/OUT, SUSTAIN Speakers 12cm x 2 Power consumption 8.7W (when using PA-3B power adaptor) Power supply Adaptor : Yamaha PA-3B AC power adaptor Batteries : Six “D” size, SUM-1, R-20 or equivalent batteries Dimensions
Style controls
PSR-240/248
Control Panel
PSR-240/248
CONNECTOR ASSEMBLY
REMARKS
PARTS LIST Ref.NO
REF.NO.
CONNECTOR ASSEMBLY
REMARKS
PARTS LIST Ref.NO
‡@
PN-CN1
M1/2-CN2
LCD
9P/L170
PN-W002
‡I
M1/2-CN11
BATTERY
BATT
2P/L330,720
440
‡A
PN-CN2
M1/2-CN3
PN
12P/L180
PN-W003
‡J
M1/2-CN4
MKC-CN1
MK2
13P/L240
450
‡B
PN-CN3
PN-CN4
PN-SW
8P/L145
PN-W001
‡K
VR/SW2/2-CN50
M1/2-CN10
PSW
4P/L90
PSW-W02
‡C
M2/2-CN12
M1/2-CN1
M2/2
6P/L350
M2/2-W001
‡L
VR/SW1/2-CN40
M1/2-CN6
VR
5P/L100
VR-W01
‡D
M1/2-CN5
MKC-CN2
MK1
11P/L160
390
‡M
MKC-CN2
MK-L
160d
12P/200
160d
‡E
M1/2-CN8
SPEAKER(L)
SP-L
2P/L230
400
‡N
MK-H
MK-L
MK-B
12P/220
160e
REF.NO.
DESTINATION
DESTINATION
‡F
M1/2-CN7
SPEAKER(R)
SP-R
2P/L680
410
‡O
MKC-CN3
MK-L
MK-C
7P/260
160f
‡G
M1/2-CN9
INV-CN906
EL-IN
2P/L580
420
‡P
MKC-CN4
MK-H
MK-D
5P/L625
160g
‡H
INV-CN905
EL LIGHT
EL-OUT
2P/L360
430
2NC-V345920
PSR-240/248
28CA1-8813449 0
PSR-240/248
1
Lower Case Assembly
1-1
Remove the battery cover assembly.(Fig.1)
1-2
Remove the fifteen (15) screws marked [270] and the two (2) screws marked [280]. The lower case assembly can then be removed. (Fig.1)
[270]:
Bind Head Tapping Screw-P 3.0X12 MFZN2Y (EP600300)
[280]: Bind Head Tapping Screw-P 3.0X25 MFZN2Y (VK228100)
(Fig.1)
PSR-240/248
6.
VR/SW 1/2 Circuit Board
8.
PN 1/2 Circuit Board
6-1
Remove the MASTER VOLUME knob marked
8-1
Remove the lower case assembly. (See Procedure 1.)
[240] on the control panel. (Fig.3)
8-2
Remove the M 1/2 circuit board. (See Procedure 2.)
6-2
Remove the lower case assembly. (See Procedure 1.)
8-3
Remove the fitteen (15) screws marked [260C]. The
6-3
Remove the three (3) screws marked [260A]. The VR/SW 1/
PN 1/2 circuit board can then be removed. (Fig.4)
2 circuit board with the knob can then be removed. (Fig.4) 9.
PN 2/2 Circuit Board
7.
VR/SW 2/2 Circuit Board
9-1
Remove the lower case assembly. (See Procedure 1.)
7-1
Remove the lower case assembly. (See Procedure 1.)
9-2
Remove the M 1/2 circuit board. (See Procedure 2.)
7-2
Remove the two (2) Screws marked [260B]. The VR/
9-3
Remove the nine (9) screws marked [260D]. The
SW 2/2 circuit board with the knob can then be removed. (Fig.4) 7-3
Remove the knob from the VR/SW 2/2 circuit board.
PN 2/2 circuit board can then be removed. (Fig.4)
PSR-240/248
11.
Speakers
11-1
Remove the lower case assembly. (See Procedure 1.)
11-2
Remove the eight (8) screws marked [290]. The right and left speakers can then be removed. (Fig.6)
13
Assembling the keyboard assembly
13-1
Install the white keys CEGB from the lower register, and
13-2
Install the rubber contacts in the assembly while pressing
then DFA keys and C’ key. Afterwards install the black keys
the keys as shown in Fig.10. Check that the rubber
from the higher register, and tighten the twenty-one (21)
contact has been firmly placed into position in the area
screws marked [140]. (Fig.9)
indicated by the arrow in Fig, 11. (Fig.10,11 and 12) *When fitting the rubber contacts, raise both ends of the frame so that keys do not push the rubber contact up. Install the MK circuit board in the assembly so that the hooks (B) hold it as shown in Fig.11.
(Fig.8) [290]: Bind Head Tapping Screw-P 4.0X8 MFZN2BL (VB931600)
(Fig.6) 12.
Disassembling the keyboard assembly
12-1
Remove the keyboard assembly. (See Procedure 5.)
12-2
Remove the two (2) Screws marked [30]. The MKC circuit
remove the black keys from the lower register. Afterward,
board can then be removed. (Fig.7)
remove the while keys DFA and C’ and then remove the
Remove the MK circuit board while pressing the fifteen
white keys DFA and C’ and then remove the white keys
(15) hooks (A) inward, and then remove the rubber
CEGB from the higher register. At this time, lift the keys
contact. (Fig.8.)
from the front and slide them towards you. The keys can
12-3
12-4
Remove the twenty-one (21) screws marked [140], then
(Fig.10)
then be removed from the assembly. (Fig.9)
(Fig.11)
[140]: Bind Head Tapping Screw-P 3.0X16 MFZN2BL (VB205200) [140]: Bind Head Tapping Screw-P 3.0X16 MFZN2B (VS756700) [140]: Bind Head Tapping Screw-P 3.0X16 MFZN2B (EP600310) [30]:
Bind Head Tapping Screw-P 3.0X8 MFZN2Y (EP600280)
[280]: Bind Head Tapping Screw-P 3.0X25 MFZN2Y (VK228100)
(Fig.7)
(Fig.9)
(Fig.12)
PSR-240/248
M 1/2 Circuit Board
to SPEAKERS(R)
to SPEAKERS(L)
to M 2/2 (MIDI)
to PN 1/2-CN1
to PN 1/2-CN2
to VR/SW
to INV-CN906
to VR/SW to BATTERY
to MKC-CN1
to MKC-CN2
Component side
M:2NA-V345800 1
PSR-240/248
PN 1/2 Circuit Board
to M-CN2
to M-CN3
to PN 2/2 CN4
Component side
Pattern side
PN:2NA-V345810 1
PSR-240/248
1. TEST PROGRAM A. PREPARATION 1) PA-3B (AC adaptor ) is used.(PA-32,PA-3 are utilizable) 2) The volume is usually moved to the use position when no volume change is required. 3) Measuring instruments: Frequency counter Level meter (with a JIS-C filter) Note: Use a stereo plug and connect the 33 ohm load to the [PHONES/AUX OUT] jack. 4) Jigs: Foot switch, MIDI cable B. HOW TO ENTER THE TEST PROGRAM While pressing the C2#, F2 and G2# keys, turn on the [STAND BY/ON] switch. C. PROCEEDING THROUGH THE TEST PROGRAM The LCD will display “TEST” when entering the test program. To select the program number, use the [OVERALL +/-] button. To execute the test, press the [STAND/STOP] button. To proceed to the next test, press the [START/STOP] button.
PSR-240/248
28
028:LCD On
Check that all LCD dots are on.
29
029:LCD Off
Check that all LCD dots are off. The LCD becomes white.
31
031:PD1 Chk
Connect the foot switch to the [FOOT SWI CH] jack. Check that the C3 note is output when starting the test program. Check that the C4 note is output when pushing the pedal and that the tone is turned off when releasing the pedal. The test result appears on the LCD.
37
037:MIDI Chk
After connecting the [MIDI IN] jack and [MIDI OUT] jack with a MIDI cable, execute the test. Check that the C4 note is output and that the test result appears on the LCD.
41
041:ROM Chk2
42
042:RAM Chk2
Checks the ROM. The test result appears on the LCD. Checks the RAMs that are connected to the CPU. The test result appears on the LCD.
48
048:Test Exit
Exit from the test program after executing this test.
2. INITIALIZE Except for the data listed below, all PSR-240/248 panel settings are reset to their initial settings whenever the power is turned on. The data listed below are backed up (i.e.retained in the memory) as long as either an AC adaptor is connected or a set of batteries is installed.
PSR-240/248
[Portable Keyboard] Model: PSR-240
MIDI Implementation Chart
Function
Basic Default Channel Changed
Transmitted
Recognized
1-7, 10 X
1-7, 10 X
Default Messages Altered
3 X **************
3 X X
: True voice
0-127 **************
0-127 0-127
Velocity
Note ON Note OFF
O 9nH, v=1-127 X 9nH, v=0
After Touch
key’s Ch’s
X X
X X
X
X
Mode
Note Number
Pitch Bender
*1
O 9nH, v=1-127 X 9nH, v=0 or 8nH
Date: 7-JAN-1999 Version: 1.0
Remarks
PSR-240/248
: Mylar Capacitor
(ƒ})
: Ceramic Capacitor
(ƒZ) (”¼ ƒ Z
)
: Semiconductive Ceramic Capacitor
M
: 28CC1-8813051 0
VR/SW : 28CC1-8813051 0
MIDI
: 28CC1-8813051 0
PN1/2 : 28CC1-8813050
INV
: 28CC1-8813051 0
PN2/2 : 28CC1-8813050
WARNING Components having special characteristics are marked and must be replaced with parts having specification equal to those originally installed.
PSR-240/248
MKC
: 28CC1-8813051
MK-L : 28CC1-8811360 MK-H : 28CC1-8811360 Note: See parts list for details of circuit board component parts.
