Citizen CBM-920 User Manual
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 CB M920. It is intended f o r f ield maintenance men.
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The dot impact printer CBM920, allowed to be built in a rack, etc. is widely available for various
data communicat ion 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 applicatio ns.
(1) Small rack built-in type dot matrix printer
(2) Light weight
(3) High-spee d pr inti ng
(4) Paper end function
(5) Auto loading function
(6) Complies wit h t he RS-232C and CENTRONICS
(7) 24 or 40 printing columns
(8) Abundant initial setting functions by the ex ternal switches
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CBM-920 Service Manual
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1. HANDLING AND MAINTENANCE OF PRINTER...........................................................................4
2. SPECIFICATIONS...............................................................................................................................4
2-1 Basic Specification.…………………………………….…………………………………………………4
3. DISASSEMBL Y AND REASSEMBLY................................................................................................5
3-1 Disassembly Procedure...................................................................................................................5
3-2 Reassembly Procedure ....................................................................................................................7
4. TROUBLESHOOTING .........................................................................................................................8
4-1 T rouble 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 La yout 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 Diagr am............................................................................................................................20
6-2-1 CBM-920-PF(Parallel Interface) ........................................................................................20
6-2-2 CBM-920-RF(Serial Interface)............................................................................................21
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CBM-920 Service Manual
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See the Instruction Manual coming with the printe r body.
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Printing Method Dot matrix
Printing Direction Unidirectional printing (Erect/inverted characters)
Character Configurat ion (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
Interface Serial interface(RS-232C) or parallel interface(CENTRONICS)
Input Buffer 2 KB
Paper Near End Detection
Paper End Detection Stops printing when the printing paper has run out.
Auto Loading
International Character Co de
Ink Ribbon Purple
Supply Voltage
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Item CBM-920-24** CBM-920-40**
Rolled paper: 57.5 +/- 0.5(W) x 50(D ) mm
Core inner diameter: 12 +/- 1 mm
Stops a data input as the printing paper is running out. Prints
the data in the buffer and stops.
If new paper is set into the paper inlet, it will be fed
automatically.
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.
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
Weight Approx. 500 g (Fittings included)
Outer Dimensions 115(W )´65(H)´119(D)mm
Mounting Hole Dimensions 109(W)´62(H)
Operating Temperature 0 to 40°C
Storage Temperature -20 to 60°C
When printing: Approx. 7 VA
When not printing: Approx. 0.7 VA
+0
-0.5mm
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CBM-920 Service Manual
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1. Remove a shield cover.
2. Remove a control board.
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(1) Insert a regular screwdriver into
(2) Raising the end of the regular
(1) Using a Phillips screwdriver,
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a slot in the top(or bottom) of the
shield cover.
screwdriver, remove the shield
cover.
loosen an earthing plate
setscrew(PHT, M2.6 X 8) and FG
cable setscrew(PHT, M2.6 X 8).
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(2) Using the Phillips screwdriver,
loosen two screws(M2.6 x 8)
fixing an inner boar d.
(3) Disconnect a connected from the
board.
(4) Remove an i ns ul ating 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.
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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.
CBM-920 Service Manual
(1) Using the Phillips screwdriver,
loosen 4 screws(M2 x 6) fixing t he
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 assemb ly.
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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 co ver.
·
(1) Using the Phillips screwdriver,
loosen a screw(PHT, M2 x 6)
fixing the knob.
(2) Remove the knob.
CBM-920 Service Manual
Remove the rollers from the front co ver.
·
(1) Pull out a roller pin from the
front cover.
Remov e a P E 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.
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