saleem Dmp Printer 4

[email protected] [email protected]

WWW.UNLIMITEDTIPS4ALL.BLOGSPOT.IN

PRINTER DOT MATRIX PRINTER (DMP) MATRIX: - Numbers or dots arranged in rows & columns in a sequential order in closed brackets. Ex: -

[:::] it is 2x3 matrix. 2Rows & 3Columns.

Characters are printed in form of matrix. So these printers are called dot matrix printers.

BIT MAP IMAGE

The upper-case 'A' shown on a 5x7 matrix.

The lower-case 'y' shown on a 5x8 matrix. The tail would be lost on a 5x7 matrix.

The space allotted for a single character printing is 9x9 or 24x24. For every letter it has left margin, right margin. Top margin will be coming for small letters and bottom margin will come for capital letters. The left over space after margin is7x5 and letter will be printed in that area only.

SPEED The speed of DMP is measured in CPS (characters per second). Speed varies from 50cps to 500cps.

QUALITY: The image quality depends upon the spacing of pins in the print head. It is measured in CPI (characters per inch). Ex:- 10cpi(default), 12cpi, 15cpi.



LPI:: - LINES PER INCH 6lpi,(default), 8lpi,10lpi. LPI

CLASSIFICATION: - types of DMPs Print head’s are 4types

7, 9, 18 & 24 pin print heads

9 &24 pin PH is being used now mostly.

SIZE: - 80& 136 columns printers 8.1/2 & 13.2inchs. 40 columns are retail printers. Default paper size pc is 11`` we have to set it to 12`` for 80column paper.

Fonts:Font is style of characters. Printers support normally draft, roman & Sanserif as default font.

Papers:Cut sheets like A4 & b4 & Continues paper like 80 & 136colomuns.

MEDIA:Ribbon is used as media in DMP`s. ribbon is an ink filled fabric. It houses in a cartridge. So it is called as ribbon cartridge. It is of many types each printer uses its own size and shape. It is 2types 1) Low density: it is used in 9pin printers. Length is 10mts. 2) High density: it is used in 24pin printers. Length is 15mts.

Manufactures:WIPRO/WEP peripherals, Epson, TVSe Identification of models WIPRO/WEP 1) 9pin 9pin 80co 80colo lomu muns ns

b) EX200

a) LX 240

c) EX200+DX

b) LX540

d) EX 300

c) LX540+DX

e) EX330+

d) LX 700

f)

e) LX 700DX

g) EX 5400

f)

LX 800

g) WEP 800DX 2) 9PIN 9PIN 136 136C COLOM OLOMUN UNS S a) EX 1050+

EX330+DX

3) 24PI 24PIN N 80CO 80COLO LOMU MUNS NS a) LQ 540 b) LQ540DX


WWW.UNLIMITEDTIPS4ALL.BLOGSPOT.IN e) LQ5400

4) 24PI 24PIN N 136C 136COLOM OLOMUN UNS S a) LQ 1050+

f)

b) LQ 1050+D 0+DX

g) HQ 1030+

c) LQ 1050+DXGOLD

h) HQ 1040+ i)

HQ1020

HQ 1070+

d) LQ DSI 5235

EPSON 1) 9PIN 9PIN 80CO 80COLO LOMU MUNS NS

3) 24PI 24PIN N 80CO 80COLO LOMU MUNS NS

a) LX 300

a) LQ 300

b) LX300+

b) LQ 300+

2) 9pin 9pin 136c 136col olom omun un

4) 24PIN 24PIN 136CO 136COLO LOMU MUNS NS

a) EX 1000

a) LQ 1050+

b) EX 1050+

b) LQ 1070+

c) FX1170

c) LQ 10 1080+

d) FX1180

d) LQ 1180+

e) FX2100

e) LQ 2180+

f)

f)

FX2700

TVSE TVSE 9PIN PRINTERS 80COLOUMN 1) Pro X 900 2) MSP 14 140 st star 3) MSP MSP 240 240 Clas Classi sic c Plus Plus 4) HD 250 GO GOLD 5) MSP 24 240 St Star 6) MSP 25 250 St Star

LQ 2780+

TVSE 9PIN PRINTERS 136COLOUMN 1) MSP 245 Star 2) MSP 255 3) MSP 255 Maratho n 4) MSP 245


WWW.UNLIMITEDTIPS4ALL.BLOGSPOT.IN 5) HD 245 GOLD

24PIN 136COLOMUNS PRINTERS

6) HD 755

1) MSP 355

7) HD 955

2) MSP 355 355Ma Mart rtho hon n 3) MSP 455 XLC 4) HD 745 5) HD 945

24PIN 80COLOMUNS PRINTERS 1) MSP MSP 450 450 Cham Champi pion on

6) MSP 34 345 St Star

2) MSP 430

BASIC PARTS OF PRINTER 

MECHANISUM



LOGIC CARD



SMPS

MECHANISUM SECTIONS 

CARRIAGE SECTION



MOTORS SECTION



PAPER FEED SECTION



SENSORS SECTION



PRINT HEAD SECTION

CHECKING OF PRINTHEADS Prin Printt hea heads ds are are of of 2 type types s

9pin 9pin & 24p 24pin in

9PIN PH 

9pin 12conductor



9pin 14conductor

12conductor PH: - check on PCB side 1

6



7

12 9 Ph Phases

3commons

From the common points to phases all should show same resistance. 14conductor PH: - check on PCB side 1

1

7

8 14 From the common points to phases all should show same resistance. Commons

phases

1

10 & 11 are thermister points.

2, 3, 8.

4

5, 6, 9

7

12, 13, 14

24PIN PRINTHEADS Print heads are of 2types

Double PCB

Single PCB

Double PCB PH checking: - 24phases + 6commons + 2thermister = 32conductor (15c + 17c).

15Conductor: - co commons phases 6

phases

17Conductor: - commons

1, 2,5,10

7

7 5,11,12,17

4, 9, 12, 14

8

8 2,10,13,14

3,11,13,15

9

1,3,4,6

15 & 16 points are thermister points in 17conductor.

lllllllllllllll

lllllllllllllllll



15conductor

17coductor

Single PCB PH checking: - 1 17

1

16

2

15

1

14

2

Single PCB PH checking: - 2

14

2

15

1

16 17

2 1

PRINTHEAD MECHANISUM & FIRING

As the printer head moves in horizontal direction, the print head controller sends electrical signals which forces the appropriate wires to strike against the inked ribbon, ribbon , making dots on the paper and forming the desired



characters. The most commonly used printer heads has 9 print wires in one column (9-pin (9-pin print heads) heads ) or 24 print wires in two columns (24-pin ( 24-pin print heads), heads), for better print quality.

MOTORS Motor is device which converts electrical energy in to mechanical energy (rotations). There 2motors in printer 1)Hybrid Stepper Motor 2)Permanent Magnet Motor

Stepper motor winding output



Stepper motor wiring diagrams.

Checking of CR motor & PF motor’s:5wire motors: -

lllll Commons

6wire motors: -phases

commons

phases 5 - 4, 6

1

2, 3, 4, 5

2 – 1, 3

3 – 3, 4

1, 2, 4, 5

5 – 1, 2

6

3 – 1, 2

4

5 – 5, 6

1, 2, 3, 4

SENSORS Sensors are of 2 types1) Mechanical sensors 2) Optical sensors Depending up on position of the sensor and working function they I – Mechanical sensors 1) Paper end sensor 2) Multi part sensor 3) Tractor friction sensor II – Optical sensors 1) Home position sensor PAPER END SENSOR: SENSOR: - no paper condition (default) copper plates are shorted. I.e. it sends low signal to IC. Printer displays paper out LED in the control panel.



If paper is inserted it sends high signal to IC. MULTI PART SENSOR: SENSOR: - it senses the gap between PH and platen roller. When we insert single paper it sends low signal to IC. When we insert multiple papers it sends high signal to IC. At time it print head fires pins with more force as print quality should be same on first and last paper. FRICTION /TRACTOR SENSOR: SENSOR : - This sensor is used to sense the path of the paper which we have chosen to load the paper either friction path or tractor path. HOME POSITION SENSOR: SENSOR: - it is located at left side of the printer it sense the carriage block as it moves from left to right and right to left side o the printer. MECHANICAL SENSORS: SENSORS: Signal in 2ways low signal & high signal 0 & 1

LOGIC CARD LOGIC CARD: CARD: - LC is PCB where all printer mechanism works with the help of electronic components. PCB are used to mechanically support and electronic components using conductive pathways or tracks etched from copper sheets laminated onto a non-conductive –substrate. Logic card has to generate the required signals for running the stepper motors, accept the signals from the sensors for status information and act on it, generates required signals to the print head which prints the data on the ribbon which in turn hits the paper to form an impression. Different section of LOGIC CARD 3) Logi Logic c sec secti tion on 4) Driv Drivin ing g sect sectio ion n 5) Inte Interf rfac ace e sect sectio ion n 6) Contr ontrol ol pan panel

LOGIC SECTION:SECTION:BIOS: BIOS: - Basic In put out put System PROM: PROM: - it stores the actual firmware of the printer and character generation information. Ex: - M27C512



EPROM: EPROM: - Erasable programmable read only memory. In this type of ROMs we can delete the data and insert new data. But we can’t edit or add the data into it. We can delete the data with the help of ultra violet rays passing through the optical opening. EEPROM: EEPROM: - (E2 (E2PRO PROM) Elec Electr tric ical ally ly Erasa rasabl ble e Pro Progr gram amm mable able read read only only memory. In this type of ROMs we can delete the data and insert new data, edit the data and add the data. CPU (OR) PROCESSER: PROCESSER: - The CPU executes the instruction stored in the EPROM. It has powerful instructions set and control logic. The address bus of the CPU is decoded to select various devices like memory, interface and other chips. CPU make commonly used are NEC, Citizen, Toshiba, W so on. For ex: - uP78C10AGQ, uPD65682GF, uPD1900. in Wipro: - Varuna centum, Chriag SMD`s are used. There are 2 types of processors in L/C. Main CPU & CO CPU 64pin main CPU dip model

64pin SMD model 100pin SMD model Co-CPU 80pin SMD model 100pin SMD model RAMS: RAMS: - Random Access Memory Rams are used for storing data which comes from PC as a buffer for temporary purpose and working area of CPU while working. 2types of rams 1) Main rams & 2) Buffer rams. CRYSTAL: CRYSTAL: - we can denote by X, Y, CR, OSC. Symbol

FUNCTION: FUNCTION : - crystals are used for generating clock frequency. Which are 2types?



1) Stee Steell body body

2) cera cerami mic c

DRIVING SECTION 1) Carriag Carriage e motor motor driving driving section section 2) PF motor motor driving driving section section (paper (paper feed) feed) 3) PRIN PRINT T HEAD HEAD driv drivin ing g sectio section n CARRIAGE MOTOR DRIVING SECTION Cr motor moves the CR block from left to right & right to left with the help of timing belt. PH will be moved according to data being printed by PH step by step. As we turn on the printer CR block should move to near the HOME POSITION sensor, if not then printer will not initialize.

VARUNA CENTUM

S L A 7 0

CPU

2 6

CR MOTOR DRIVING CIRCUT

PF MOTOR DRIVING SECTION PF motor is used for loading and ejecting paper as we insert and feed the paper line by line according to data being printed.



PRINT HEAD DRIVING SECTION:PH SECTION: PH pins will be fired according to the data being printed. 10 Pin Transistor Packs UPA1436AH this pack is used for print head driving and paper feed motor driving purpose in all WEP and EPSON printers. 12pin Transistor Packs SLA4301/4301 is used for print head driving purpose in TVSE 9pin printers only. 16pin Transistor Packs SDC02/03/04 this pack is used for paper feed motor driving purpose in TVSE printers only. SDH02/03/04 this pack is used for carriage motor driving purpose in TVSE printers only. M5248P, M5286P this pack is used for print head driving purpose in 24pin TVSE printers only.

18pin transistor pack/IC



This pack is used for CR motor driving purpose in all makes of printers.

RESISTOR PACKS 2types packs packs

serial parallel

INTERFACE Interface cables are used for connecting printer with computer and print the required data. Types of interfaces 1)

seri serial al inte interf rfac ace e

2) Para Parall llel el inte interf rfac ace e 3) Netwo etwork rk cabl cable e

4) USB cable Type A

Type B

CONTROL PANEL CP is used for controlling and adjusting settings of the printer as per our requirements. POWER LED: - This led indicates when printer is powered on. DATA LED: LED: - it indicates when printer receives data for printing from computer. READY LED: LED: - it indicates when printer is ready for printing when printer is turned on and paper is loaded for printing. ONLINE LED: LED: - it is used for indicating when printer online/offline. When printer is in online it prints the data. When it is in offline doesn’t print the data. ONLINE LED &SWITCH: &SWITCH: - When printer is printing the data, to pause the printing press the switch. To continue the printing from the same point again



press the switch, it starts the printing from the same point where it has stopped printing. FORM FEED SWITCH (FF):- when we have loaded paper after printer is turned on to micro feed the paper in forward bias press the switch. To go to next page, keep the printer in offline and press the switch. LINE FEED SWITCH (LF):- when online led is blinking to reverse micro feed the paper press the switch. When online led is off if you press the switch paper will be feed line by line. LOAD/EJECT SWITCH: SWITCH: - when printer is in tractor mode to load/eject the paper press the switch. FONT LED`S & SWITCH: SWITCH : - LED’s indicate the type of font which we have chosen. Switch is used for selecting required font. Ex: - draft, roman… PITCH LED’S & SWITCH: SWITCH : - LED’s are used for indicating selected CPI (characters per inch) 10CPI, 12CPI, 15CPI, PS (page select).

TROUBLESHOOTING OF DMP No power condition condition::Check in put voltage and power cables (230VAC). Check power supply for any damages. Check PS out put voltages. (+5v, gnd, +/-12v, +24/27/30/35/40VDC) Check logic card for any damages. Printer not initializing:initializing :Check carriage block is moving freely or not, form left to right and right to left. Check carriage shafts bending or rust. Check timing belt damage. Check carriage motor damage. Check PS out put voltages coming correctly or not. Abnormal feed of ribbon:ribbon :-



Check ribbon mask for damage. Check ribbon mask holder for any damage. Check ribbon cartridge. Check ribbon driving assembly, if not rotating correctly in anti clock wise direction direction.. Check belt driven pulley physical damage. Dot missing in the printing:printing :Check print head pin’s & coils. Check print head cables for cut & damage. Check ribbon mask damage. Check ribbon Check print head driving section in logic card. (Circuit & components) Abnormal feed of paper:paper :Check paper feed gear (teeth damage). Check paper feed motor damage. Check platen roller damage. Check paper path for any object struck in the way. Check tractor gear. Check sprockets in tractor unit. Paper not loading:loading :Check paper end sensor. Check paper path. Check paper feed gear. Check paper feed motor. Check PF motor driving section circuit. Printing is dull one side of the paper :Check the head gap. (Gap between PH & platen roller)



Check the CR shafts if any bending. Check the carriage lock. Printer not detecting:detecting:Check interface cables for any damage. Check interface connectors any damage. Check printer drivers mismatch. Check components near by connectors.

saleem Dmp Printer 4

Recommend Documents