Citizen CBM-920 Manuale utente

CITIZEN

Service Manual

Model: CBM-920

Dot Matrix Printer

Rev. 1.00 Newly Issued on May. 25. 1998

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CBM-920 Service Manual

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This manual describes the disassembly, reassembly, and maintenance procedures of the dot

impact printer CBM920. It is intended for field maintenance men.

The dot impact printer CBM920, allowed to be built in a rack, etc. is widely available for various

data communication terminals, POS terminals, measuring instrument terminals, and so on.

This printer is designed small, light-weight, provided with abundant functions, and available for

a wide range of applications.

(1) Small rack built-in type dot matrix printer

(2) Light weight

(3) High-speed printing

(4) Paper end function

(5) Auto loading function

(6) Complies with the RS-232C and CENTRONICS

(7) 24 or 40 printing columns

(8) Abundant initial setting functions by the external switches

CBM-920 Service Manual

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1. HANDLING AND MAINTENANCE OF PRINTER...........................................................................4

2. SPECIFICATIONS...............................................................................................................................4

2-1 Basic Specification.…………………………………….…………………………………………………4

3. DISASSEMBLY AND REASSEMBLY ................................................................................................5

3-1Disassembly Procedure...................................................................................................................5

3-2Reassembly Procedure ....................................................................................................................7

4. TROUBLESHOOTING.........................................................................................................................8

4-1 Trouble Shooting Procedure……………………………………………………………………..………8

4-2 Trouble Shooting Guide……..…………………………………………………………………….……..9

5. SERVICE PARTS LIST......................................................................................................................10

5-1 Parts List for Mechanism.............................................................................................................10

5-2 Disassembly Drawing...................................................................................................................11

5-3 Parts List for Control Board .......................................................................................................12

5-4 Parts Layout Drawing..................................................................................................................14

5-4-1 Main PCB Assy for CBM-920-PF(Parallel Interface)........................................................14

5-4-2 Main PCB Assy for CBM-920-RF(Serial Interface)………….……………………………...15

5-4-3 Drawing for Jumper Lead……………………………………………………………………….16

6. DRAWINGS.........................................................................................................................................17

6-1 Circuit ...........................................................................................................................................18

6-1-1 Block Diagram......................................................................................................................18

6-1-2 Coverall Wiring Diagram……………………………..………….……………………………...19

6-2 Circuit Diagram............................................................................................................................20

6-2-1 CBM-920-PF(Parallel Interface) ........................................................................................20

6-2-2 CBM-920-RF(Serial Interface)............................................................................................21

CBM-920 Service Manual

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See the Instruction Manual coming with the printer body.

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Item CBM-920-24** CBM-920-40**

Printing Method Dot matrix

Printing Direction Unidirectional printing (Erect/inverted characters)

Character Configuration (5+1)´8 (4+0.5)´8

Number of Digits 24 digits: 144 dots/line 40 digits: 180 dots/line

Printing Speed Approx. 2.5 lines/sec. Approx. 1.8 lines/sec.

Character Size 1.62´2.4mm 1.08´2.4mm

Line Spacing 3.52mm

Printing Paper Rolled paper: 57.5 +/- 0.5(W) x 50(D) mm

Core inner diameter: 12 +/- 1 mm

Interface Serial interface(RS-232C) or parallel interface(CENTRONICS)

Input Buffer 2 KB

Paper Near End Detection Stops a data input as the printing paper is running out. Prints

the data in the buffer and stops.

Paper End Detection Stops printing when the printing paper has run out.

Auto Loading If new paper is set into the paper inlet, it will be fed

automatically.

International Character Code

Capable of setting one out of 8 countries with the DIP switch.

(Japanese, U.S., French, German, British, Italian, Spanish,

Danish) Capable of setting one of the above plus another

one(Swedish) by setting a command.

Ink Ribbon Purple

Supply Voltage 5 V DC +/- 5 % (Voltage at print) Approx. 2.5 A, Approx. 4 A at

peak(10 % duty) Use the external power source

Mean Power Consumption When printing:Approx. 7 VA

When not printing: Approx. 0.7 VA

Weight Approx. 500 g (Fittings included)

Outer Dimensions 115(W)´65(H)´119(D)mm

Mounting Hole Dimensions 109(W)´62(H) -0.5mm

Operating Temperature 0 to 40°C

Storage Temperature -20 to 60°C

CBM-920 Service Manual

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1. Remove a shield cover.

(1) Insert a regular screwdriver into

a slot in the top(or bottom) of the

shield cover.

(2) Raising the end of the regular

screwdriver, remove the shield

cover.

2. Remove a control board.

(1) Using a Phillips screwdriver,

loosen an earthing plate

setscrew(PHT, M2.6 X 8) and FG

cable setscrew(PHT, M2.6 X 8).

(2) Using the Phillips screwdriver,

loosen two screws(M2.6 x 8)

fixing an inner board.

(3) Disconnect a connected from the

board.

(4) Remove an insulating sheet.

3. Remove the front covers(upper and lower).

(1) Push out a roller pin from the

lower front cover(where the

printing paper comes out).

(2) Paying attention to a harness

projecting from the front cover,

remove the front cover.

CBM-920 Service Manual

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·Remove an N-PE assembly from the front cover.

(1) Pull out a PE retainer.(It has

been press-fit)

(2) Remove the N-PE assembly.

·Remove a paper holder bracket from the

front cover.

(1) Using the Phillips screwdriver,

loosen 4 screws(M2 x 6) fixing the

paper holder bracket.

(2) Remove an earth plate 2 and FG

cable terminal.

(3) Remove the paper holder bracket.

·Remove an operation panel assembly from

the front cover.

(1) Pull out a switch assembly.

(2) Pull out a LED assembly.

CBM-920 Service Manual

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·Remove a mechanical assembly from the front cover.

(1) Pull out the mechanical assembly

from the front cover.

·Remove a knob from the front cover.

(1) Using the Phillips screwdriver,

loosen a screw(PHT, M2 x 6)

fixing the knob.

(2) Remove the knob.

·Remove the rollers from the front cover.

(1) Pull out a roller pin from the

front cover.

·Remove a PE assembly from the front

cover.

(1) Remove the PE assembly from

the front cover.

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Reassemble each part in the reverse order of the disassembly procedure described in Section

3-1.

CBM-920 Service Manual

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When a trouble occurs, confirm its phenomenon, locate a defective part in accordance with 4-2

Troubleshooting Guide, and troubleshoot as described below.

·Phenomenon: Find a trouble phenomenon in this column. If there are multiple

phenomena, take all the corresponding items into consideration.

This allows you to specify a hidden defective part.

·Cause: Lists as many possible causes as possible. Guess a trouble cause out

of them and take its check method to specify the trouble cause.

·Check Method: Describes a check method to specify a trouble cause.

·Remedy: Troubleshoot by taking a remedy described in this column.

By troubleshooting in accordance with the above-mentioned procedure, you can troubleshoot

efficiently with less misjudgments.

CBM-920 Service Manual

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Phenomenon Cause Check Method Remedy

Faulty power supply Check whether 5 V DC is

available. Supply 5 V DC.

Faulty mounting and

connection of an interface

cable

Check mounting and

connection of the interface

cable.

Connect the interface

cable correctly.

Printing failure

No printing

Faulty printer

mechanism Replace the printer

mechanism unit.

Thin printing

color Faulty power supply Check whether a 5 V DC

power capacity is sufficient. Use the power source

with a sufficient capacity.

Missing dots Foreign substance

adhered to a printing

head

Check the head for any

adhered foreign substance. Eliminate the foreign

substance.

Bad printing

quality Faulty ribbon Replace the ribbon.

Faulty connection of a

motor connector Check connection of the

connector. Connect the connector

correctly.

Faulty power supply Check whether a 5 V DC

power capacity is

sufficient.

Use the power source

with a sufficient capacity.

Paper feed failure

A printing paper

feed motor does

not function or

malfunctions. Faulty printer

mechanism Replace the printer

mechanism.

Paper feed failure Checkwhether or not the

printing paper is jamming

or torn and caught in a

paper path.

Eliminate unnecessary

printing paper and re-set

it correctly.

Foreign substance in the

gear Check the motor gear of

the printer mechanism for

any foreign substance.

Eliminate the foreign

substance.

The printing

paper is not fed

or fed

irregularly.

Broken gear Check the motor gear for

breakage. If broken, replace the

printer mechanism.

Faulty sensor

Does not detect

the printing

paper.

Faulty paper sensor Check the window of

the paper sensor for any

foreign substance.

Eliminate the foreign

substance or replace the

printer mechanism.

When the trouble

still persists Replace the control

board and check

whether the printer

functions properly.

Replace the control

board.

* For the printer mechanism MD910 series, see the Service Manual separately provided.

CBM-920 Service Manual

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EXPLODED VIEW

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9,10

E 62010760

E 6200-620

E 6200-630

E 62020240

E 6611-590

E 6233-020

E 6611-600

E 6233-050

E 6233-030

E 4035-780

E 5200-270

E 4035-770

E 40000140

E 4900-360

E 5102-450

E 480-330

E 40000150

E 4900-400

E 391-180

E 40000160

E 4900-370

E 391-110

E 4035-790

MD910

MD911

E 4900-330

E 4900-340

E 4900-350

E 70010870

E 70010880

E 6233-060

76G38641

76G60124

76G23670

76G22839

Top Case

Front Panel-T

Front Panel-B

Shield Cover

Paper Holder BK

Knob

PE Support

Panel Shaft Roller

Panel Shaft

Insulation Sheet

OP Sheet

FG Cable

OP PCB Assy

Harness 920-7

Tact SW. SKHHNH

LED SEL2110S

PE PCBAssy

Harness 920-5

Photo Interrupter GP2S07

N-PE PCB Assy

Harness 920-6

Photo Interrupter GP2S24

FG Plate

Printer MD910-SS

Printer MD911-SS

FPC SMCD-4x210

FPC SMCD-6x240

FPC SMCD-7x225

Main PCB Assy CBM920-RF

Main PCB Assy CBM920-PF

Mounting BRT

Screw M3x12 for mounting BRT

Screw M2x6

Screw M2.6x8

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