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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CBM-920 Service Manual
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When a trou ble occurs, confirm its phenomenon, locate a defective part in accordance with 4-2
Troubleshooting G uid e, and troubleshoot as described below.
·
·
·
·
By troubleshooting in accordance with the above-mentioned procedure, you can troubleshoot
efficiently with less misjudgments.
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Phenomenon: Find a trouble phenomenon in this column. If there are multiple
phenomena, take all the corresponding items into consideration.
This allows you to spec if y 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: Tro ubleshoot by taking a remedy described in this column.
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CBM-920 Service Manual
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Phenomenon Cause Check Method Remedy
Printing failure
No printing
Thin printing
color
Missing dots Foreign substance
Bad printing
quality
Paper feed failure
A printing paper
feed motor does
not function or
malfunctions.
The printing
paper is not fed
or fed
irregularly.
Faulty sensor
Does not detect
the printing
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Faulty power supply Check whether 5 V DC is
available.
Faulty mounting and
connection of an interface
cable
Faulty printer
mechanism
Faulty power supply Check whether a 5 V DC
adhered to a printing
head
Faulty ribbon Replace the ribbon.
Faulty connection of a
motor connector
Faulty power supply Check whether a 5 V DC
Faulty printer
mechanism
Paper feed failure Check whether or not the
Foreign substance in the
gear
Broken gear Check the motor gear for
Check mounting and
connection of the interface
cable.
power capacity is sufficie nt.
Check the head for any
adhered foreign substance.
Check connection of the
connector.
power capacity is
sufficient.
printing paper is jamming
or torn and caught in a
paper path.
Check the motor gear of
the printer mechanism for
any foreign substance.
breakage.
Faulty paper sensor Check the window of
the paper sensor for any
foreign substance .
Supply 5 V DC.
Connect the interface
cable correctly.
Replace the printer
mechanism unit.
Use the power source
with a sufficient capacity.
Eliminate the foreign
substance.
Connect the connector
correctly.
Use the power source
with a sufficient capacity.
Replace the printer
mechanism.
Eliminate unnecessary
printing paper and re-set
it correctly.
Eliminate the foreign
substance.
If broken, replace the
printer mechanism.
Eliminate the foreign
substance or replace the
printer mechanism.
paper.
When the trouble
still persists
Replace the control
board and check
Replace the control
board.
whether the printer
functions properly.
* For the printer mechanism MD91 0 serie s, see the Service Manual separately provided.
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4
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7
8
9,10
11
12
15
16
17
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
Top Case
Front Panel-T
Front Panel-B
Shield Cov er
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 PCB As sy
Harness 920-5
Photo Interrupter GP2S07
1
1
1
1
1
1
1
2
2
1
1
1
1
1
2
2
1
1
1
18
19
20
21
30
31
32
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
N-PE PCB Assy
Harness 920-6
Photo Interrupter GP2S24
FG Plate
Printer MD910-SS
Printer MD91 1-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 M2x6
Screw M2.6x8
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CBM-920 Service Manual
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CBM-920 Service Manual
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IC 1
IC 2
IC 3
IC 4,7
IC 4
IC 5
IC 6
IC 7
IC 8
IC 9
TR 1
TR 2-5
TR 6
TR 7
TR 8
TR 9
TA 1,2
DA 1
E 107-250
E 107-260
E 107-320
E 210-090
E 210-090
E 202-910
E 210-110
E 2010040
E 210-080
E 210-100
E 393-010
E 348-040
E 379-060
E 327-070
E 379-070
E 358-060
E 390-280
E 400-590
CPU uPD78C10AGF-3BE
EP-ROM M27C256B-15F1
S-RAM LC3564SM-70/75/10
C-MOS TC74HC573AF
C-MOS TC74HC573AF
Reset IC PST520F
TTL NS74LS06F
I/F IC MAX232CPE
C-MOS TC74HC00AF
C-MOS TC74HC74AF
Transistor RN1002
Transistor 2SC1740SR
Transistor 2SD1802ST
Transistor 2SB1202ST
Transistor 2SD1817
Transistor DTA143ES
Tr. Array TD62308AF
Diode Array MC-921
1
1
1
2
1
1
1
1
1
4
1
1
1
1
1
1
1
1
1
1
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1
1
1
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OSC 1
DS 1
DS 2
BL 1
R 2,17,31
R 3,4,14-16,29
R 3,4,14-16
R 5,9
R 6,10,21,23
25,27
R 7,1 1
R 8,12,13,22
24,26,28
R 18
R 19,20,30
R 19,20,30
E 501-380
E 5103-510
E 5103-530
E 4009-510
E 3900-500
E 3900-510
E 3900-510
E 3900-520
E 3900-560
E 3900-490
E 3900-550
E 3900-540
E 3900-530
E 3900-530
X’tal CST11.0MTW
Dip Switch KSD-08
Dip Switch KSD-05
Fe. Beads BL02RN1-R62
Chip Re. CR10-102J
Chip Re. CR10-103J
Chip Re. CR10-103J
Chip Re. CR10-181J
Chip Re. CR10-683J
Chip Re. CR10-101J
Chip Re. CR10-333J
Chip Re. CR10-332J
Chip Re. CR10-221J
Chip Re. CR10-221J
1
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2
6
2
7
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3
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1
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3
5
2
6
2
7
1
2
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CBM-920 Service Manual
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CA 1
C 1,6,7
C 2-5,8,18,19
C 2-5,8-18
C 9,14,16,24
C 10
C 10,19,22,23
C 13
C 15
C 17
C 20,21
C 25
PC 1-9
PC 1-7
RA 1
RA 1,4
RA 2
RA 2,5
RA 3
RA 4
RA 5
RA 6,7
E 2000-090
E 2600-050
E 2600-090
E 2600-090
E 2600-120
E 2010-860
E 2010-860
E 2010-890
E 2010-870
E 2010-880
E 2010-900
E 2122-060
E 2600-120
E 2600-120
E 3500-220
E 3500-220
E 3500-050
E 3500-050
E 3500-210
E 3500-090
E 3500-040
E 3500-110
Ca. Array CGSD8x101M
Chip C. Cap. GRM40F103Z50
Chip C. Cap. GRM40B471K50
Chip C. Cap. GRM40B471K50
Chip C. Cap. GRM40F104Z25
El. Cap. 25JS-10uF
El. Cap. 25JS-10uF
El. Cap. 50JS-1uF
El. Cap. 10MR-100
El. Cap. 10MR-1000 10x15
El. Cap. 25JS-4.7uF
C. Cap. DD104-63B222K50
Chip C. cap. GRM40F104Z25
Chip C. cap. GRM40F104Z25
Re. Array M7-1-473J
Re. Array M7-1-473J
Re. Array M5-1-103J
Re. Array M5-1-103J
Re. Array M6-3-471J
Re. Array M7-1-103J
Re. Array M9-1-103J
Re. Array M8-3-472J
1
3
1
3
7
6
4
4
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4
1
1
1
1
1
1
2
1
1
9
7
1
2
1
2
1
1
1
1
2
CN 1
CN 2
CN 3
CN 4
CN 5
CN 6
CN 7
JL 1
JL 2
J 1,3
J 1,2
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E 48000740
E 48000745
E 48000750
E 48000755
E 48000760
E 48000765
E 51060010
E 51060020
E 3900-480
E 3900-480
Connector HIF3F20PA-2.54DS
Connector 5229-04CPB
Connector 5229-06CPB
Connector 5229-07CPB
Connector 53014-0310
Connector 53014-0410
Connector 53014-0510
Wire Array KJL-1
Wire Array KJL-1
Chip Re. CR10-000J
Chip Re. CR10-000J
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1
1
1
1
2
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CBM-920 Service Manual
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KJL-2
14
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5-4-2 Main PCB Assy for CBM-920-RF(Serial Interface)
CBM-920 Service Manual
KJL-1
KJL-2
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5-4-3 Drawi ng for Jumper Lead
CBM-920 Service Manual
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CBM-920 Service Manual
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The following lists the reference drawi ng s fo r m aintenance, and so on.
·Block Diagram
· Circuit Diagram ---------------- For the serial interface, For the parallel interface
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CBM-920 Service Manual
CBM-920 COVERALL WIRING DIAGRAM
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