Citizen CBM-270 User manual

CITIZEN
Service Manual
Model : CBM-270
Line Thermal Printer
Rev. 1.00 Newly issued on 05. Jan. 1999
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This manual describes the disassembly, reassembly, and maintenance procedures of the Line
Thermal Printer CBM-270. It is intended for field maintenance men.
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This small line thermal printer is designed for various types of data communication terminals
and measuring instrument terminals. Its abundant built-in features allow you to widely use
this printer for different applications. Prior to using it, read and understand this manual
thoroughly.
(1) Small, lightweight, and installable in a narrow area
(2) High speed and low noise, owing to line thermal print
(3) Long-life printing head and high reliability, owing to the simple mechanism
(4) Easy paper-loading, owing to the auto-loading function
(5) Built-in input buffer
(6) Capable of printing a bar code (Special command)
(7) Capable of accommodating both thermal paper and label paper
(8) A little discharge (1 sheet) of the label paper at power-on or paper replacement
(9) Capable of printing in two colors (when special paper is used)
(10) External characters registration function (94 kanji characters, 95 ANK characters)

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1. HANDLINGAND MAINTENANCE OF PRINTER..........................................................................4
2. SPECIFICATIONS.............................................................................................................................5
2.1 Basic Specifications................................................................................................................................... 5
2.2 Paper Specifications (Recommended Paper)............................................................................................ 6
3. DISASSEMBLY AND REASSEMBLY ...............................................................................................7
3.1 Disassembly Procedure............................................................................................................................. 7
3.2 Reassembly Procedure ............................................................................................................................ 12
4. TROUBLESHOOTING ....................................................................................................................13
4.1 Troubleshooting Procedure..................................................................................................................... 13
4.2 Troubleshooting Guide............................................................................................................................ 13
5. SERVICE PARTS LIST....................................................................................................................19
5.1 Parts List for Mechanism ....................................................................................................................... 19
5.2 Disassemble Drawing.............................................................................................................................. 20
5.2.1 Drawing for Operation Panel Board..............................................................................................
21
5.3 Parts List for Control Board................................................................................................................... 22
5.4 Parts Layout Drawing............................................................................................................................. 24
5.4.1 Serial Interface (Parts side) ...........................................................................................................
24
5.4.2 Serial Interface (Solder side).......................................................................................................... 25
5.4.3 Parallel Interface (Parts side) ........................................................................................................ 26
5.4.4 Parallel Interface (Solder side)....................................................................................................... 27
6. DRAWING........................................................................................................................................28
6.1 Block Diagram......................................................................................................................................... 28
6.2 Circuit Diagram....................................................................................................................................... 29
6.2.1 Serial Interface (CBM270-RF) .......................................................................................................
29
6.2.2 Parallel Interface (CBM270-PF) .................................................................................................... 30
7. OUTLINE DRAWING......................................................................................................................31

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See "Unpacking" and "OPERATION" in the User's Manual accompanying the printer body.

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Model
Item CBM-270-RF120-* CBM-270-PF120-* CBM-270-RF230-* CBM-270-PF230-*
Printing system Line thermal dot printing
Printing width 48 mm (384 dots/line)
Dot density 8 dots/mm (Width, Length)
Paper feed pitch 0.125 mm
Printing speed Approx. 11 lines/sec. (At maximum)
Printing digits and
character size 32 columns (12 ´24 Font A) 1.25 ´3.00 mm 42 columns (9 ´24 Font B) 0.88 ´3.00 mm
Line interval Initial value: 4.23 mm (1/6 inch)
Can be set with a command (1/360 inch at minimum)
Character types Alphanumerals, symbols, international characters
(Choose from 10 countries)
Character code Domestic characters, IBM characters #2 (Choose either)
Bar code type UPC-A/E, JAN(EAN) 13-/8-column, ITF, CODE 39, CODE 128, CODABAR
Paper
(See Paper Specifications) Thermal paper roll : 58 + 0/- 1 mm xf83 (max.) mm, 60~75mm thick
Thermal label paper : 58 + 0/- 1 mm x f83 (max.), 150mm thick (max.)
(L and M Spec. only) Label width: 56 mm (max.)
Label length: 25 mm/sh. (min.)
Interface Serial (RS-232C), Parallel (CENTRONICS compliant)
Input buffer 2 KB
Download characters Font A, B: 95 characters each
Auto-loading Provided (Can be enabled/disabled with the DIP switch)
Paper end function Provided
Paper near end function Provided (Can be enabled/disabled with the DIP switch)
Label detecting function Capable of selecting label interval detection, black mark detection, or none.
Printing color Capable of printing in two colors (red/black) with the special thermal paper.
AC adapter Rated input : 100~240 V, 50/60 Hz, 40 VA
Rated output : 7.2 V DC, 2A
Type 27 AD
AC cord 2-core cord (Depends on the destination)
Supply voltage 120 V AC +/- 10%, 60 Hz 230 VAC +/- 10%, 50/60 Hz
Power consumption At non-printing: Approx. 2 W
At printing: Approx. 15 W (approx. 20 W at maximum)
Weight Main body: Approx. 600 g (Paper roll excluded)
AC adapter: Approx. 350 g
Outer dimensions 106 (W) ´184 (D) ´110 (H) mm
Operating temperature and
humidity 5~40 °C, 35~85 % RH (No dew condensation)
Storage temperature and
humidity -20~60°C, 10~90% RH (No dew condensation)
Reliability Printing head life: (25°C)
Pulse resistance : 50 million pulses or more (Print rate 12.5%)
Wear resistance : 50 km or more (With recommended thermal paper at normal
temperature and humidity)
EMI *1 FCC Class-A EN55022 Class-A
Applicable standard
(Main body) *1 GS, CE Marking
Applicable standard
(Power source) UL, C-UL GS
**1 indicates the standard satisfied when theAC adapter 27AD is used.
*GS and CE Marking are satisfied when the main body andAC adapter are combined.

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(1) Thermal paper roll
·Type : Thermal paper
·Paper width : 58 + 0/- 1 mm
·Paper thickness : 60~75mm
·Roll diameter : f83 mm or less
·Printing surface : Outside of the roll (Surface)
·Recommended paper : TF50KS-E2C (Monochrome) made by NIPPON SEISHI or its
equivalent
735FA(2-color, Black based) made by RICOH or its equivalent
PB670(2-color, Red based) made by MITSUBISHI SEISHI or its
equivalent
·Core :f12 mm(Inner dia.), f18 mm (Outer dia.)
(2) Thermal label paper(L and M spec. only)
·Type : Thermal paper (Printing surface)
·Paper width : 58 + 0/- 1 mm
·Label width : 56 mm or less
·Label length : 25~300 mm (For label interval detection)
25
~300 mm (For black mark detection) *Black mark section excluded
·Label interval : 3~300 mm (Black mark interval for the black mark detection)
·Black mark width : 15 mm or more (From the center of the paper, black paper only)
·Paper thickness : 150mm or less
·Roll diameter : f83 mm or less (Depends on the outer diameter of the core)
·Printing surface : Outside of the roll (Surface)
·Recommended paper : For label interval detection
KPT86S P22 G63BC (Monochrome) made by OHJI TUCK or
itsequivalent
For black mark detection
KPT865P (Monochrome) made by OHJI TUCK or its equivalent
·Core : f12 mm or more (Inner dia.), 3 mm thick
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1. Use of non-specified paper may cause irregularity of print density. If this is the case, use the
DIP switch to reset print density. (See 5. DIP SWITCH SETTING)
2. Do not paste the paper to the core.
3. If the paper comes in contact with a chemical or oil, it may discolor or lose a record.
4. Do not rub the paper surface strongly with a nail or hard metal. It may discolor.
5. Discoloring starts at about 70°C. Watch out for effects of heat, humidity, light, and so on.
6. Do not use the label paper when the printer has been set for thermal paper, and vice versa.
Be careful not to mistake a type of label paper. It could cause malfunctioning or damage the
printing head.

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In case of maintenance work, observe the following:
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(1) If the printer functions properly, do not disassemble, reassemble, or adjust it. Particularly,
do not loosen each setscrew unless required.
(2) After inspecting the printer, be sure to confirm that it is free from error.
(3) Never try to print without setting the printing paper in the printer. Confirm that it is
properly set.
(4) In case of maintenance work, be careful not to leave the used parts or screws in the printer.
(5) When handling the thermal head or control board, do not wear the gloves which will easily
cause static electricity. Prior to handling it, discharge static electricity from your body.
Also, never conduct maintenance work in a place where the printer will be easily electrified.
(6) When disassembling and reassembling, check the cords and boards for any damage, and do
not cable or fix them in an inappropriate manner by force.
(7) Never carry out maintenance work with the power turned on.
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1. Prior to Disassembly
(1) Disconnect all the cables from the rear of the main body. For your safety, unplug a power
cord from a plug socket.
(2) Leave the printer cover attached.

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2. Removing the Screws from the Bottom of the Main Body
(1) Turn over the printer body.
(2) Remove two M3 ´10 (BT) screws. Then, turn back the printer body to its original position.
Do this, holding its upper and bottom covers.
3. Detaching the Printer Cover and Paper Roll
(1) Detach the printer cover. Put a finger, etc. on a convexed part from the rear of the printer
body and lift.
(2) Detach the paper roll. If the paper roll has been set in the printer, cut he surplus paper
and detach it gently. See "HOW TO REMOVE REMAINING PAPER ROLL" in the
USER'S MANUAL.

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4. Detaching the Platen Roller Unit
(1) Raise the head-up lever.
(2) Unlock the platen roller unit. Pull up the blue levers on both sides of the platen roller unit,
while opening them outside.
(3) Detach the platen roller unit. Hold the blue levers on both sides of pull up. Keep the
platen unit carefully so as not to damage it.
(4) Lower the head-up lever.
5. Detaching the Upper Cover
(1) Lift the upper cover from the rear of the printer body. When this is done, lift it gently.
(2) Disconnect all the connectors. Holding up the upper cover, disconnect all the connectors
from the control board. Hold the base of the connector to disconnect it. Pulling the cable
will snap it.
(3) Disconnect the FG cable. Remove one M3 ´8 (BT) screw used to secure it to the control
board.
(4) Detach the upper cover.

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6. Detaching the NPE Sensor Unit
(1) Remove one M3 ´10 (BT) screw used to secure the NPE sensor unit.
(2) Pull out a cable.
7. Detaching the Operation Panel Board
(1) Remove two M2.6 ´8 (BT) screws. Turn over the upper cover and unscrew the operation
panel board.
(2) Detach the operation panel board.
8. Detaching the Printer Mechanism
(1) Remove four M2.6 ´8 (BT) screws used to secure the printer mechanism. Remove two
screws each from the front and back.
(2) Pull out the printer mechanism. Pull it out gently to the paper holder side (front) without
pulling a cable. If the label sensor is attached, separate it from the printer mechanism.

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9. Detaching the Control Board
(1) Remove one M3 ´8(BT) screw.
(2) Turn on the Power switch.
(3) Detach the board. Slightly opening outside the plastic part near the Power switch, slide it
upward to the near side of the printer body to detach.
10. Detaching the shielding plate.
*For Steps 5 to 9, carry out only those required for maintenance.

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Reassemble the disassembled parts in the reverse order of the disassembly procedure described
in 3.1.
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1. Route the cables very carefully so that they will not be caught.
·The flat cable should be located on the board side.
·Take care that the NPE sensor will not be cabled above the DIP switch.
2. Tighten the screws firmly, but avoid tightening them too hard.
3. Use only the attached screws. There are several kinds of screws used. If they are
unscrewed, be sure to put them back in their original places.
4. After reassembly, be sure to check prior to turning on the power.

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If the printer has a trouble, confirm its phenomenon, determine a defective part according to 4.2
Troubleshooting Guide, and then, repair it in the specified manner.
·Phenomenon Find a corresponding trouble phenomenon in this column. If there
multiple corresponding phenomena, confirm taking all of them into
account. This allows you to determine a hidden defective part.
·Cause Possible causes are listed as many as possible in this column. Project a
trouble cause and determine it by the check method described in the
next column.
·Check Method Check methods are listed in this column to determine the relevant
trouble cause.
·Repair Method Repair the defective part in the manner described in this column.
Efficient troubleshooting is enabled without making a erroneous judgment by repairing in the
above-mentioned procedure.
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The following table lists the check methods and repair methods based on possible phenomena
and causes.
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Phenomenon Cause Check Method Repair Method
The AC cord is not
connected. ---
Connect the AC cord to
the specified plug
socket, etc.
The voltage is
abnormal.(It is slightly
higher than the rating
in the no-load state)
Use a voltmeter to
measure a supply
voltage.
Replace the AC adapter.
The power cannot be
turned on (POWER
lamp not illuminated)
The AC adapter was
connected to(used for)
another device in the
past. 12. Replace
the AC adapter.
---
Replace the AC adapter.

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Phenomenon Cause Check Method Repair Method
The AC adapter is not
connected. --- Connect the specified
AC adapter.
Check whether or not
the non-specified
power supply was used
in the past.
Use the specified AC
adapter.
The fuse is gone.
Check whether or not
the specified fuse is
used.
Use the specified fuse.
Check whether or not
the specified power
supply is used.
Use the specified AC
adapter.
The power cannot be
turned on.(POWER
lamp not illuminated)
Others
Check whether or not
the cable or connector
of the operation panel
board is connected.
Replace the cable of
the operation panel
board. Connect the
connector.
The power is turned on
by disconnecting the
cable of the printer
mechanism.
(Does not operate)
Replace the printer
mechanism.
The fuse blows out
immediately if
replaced. It blows out
during operation.
(F1blowsout)
The printer
mechanism or control
board is defective.
The phenomenon
remains unchanged
after the above-
mentioned check.
Replace the control
board.
Measure a circuit
voltage with a
voltmeter, and it is
normal.
Replace the control
board.
The voltage is higher. Replace Tr1, ZD2, or a
peripheral circuit part.
Ditto (F2 blows out) The control circuit is
corrupt. The voltage
is abnormal.
The voltage is lower. Replace the control
board.
The power is turned on
by disconnecting the
motor cable.
(Does not operate)
Replace the printer
mechanism.
Ditto (F3 blows out) The motor or driver of
the printer mechanism
is defective.
The phenomenon
remains unchanged
after the above-
mentioned check.
Replace the motor
driver or control board.
*If the fuse is gone while using the specified AC adapter, it is likely that the printer mechanism or
control board is defective. Replace either of them. Also, check the wiring of the interface.

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Phenomenon Cause Check Method Repair Method
Faulty power supply Check whether or not
the specified
AC adapter is used.
Use the specified
AC adapter.
Faulty mounting and
connection of printer
mechanism
Check mounting and
connection of the
printer mechanism.
Mount the printer
mechanism properly.
The printer operates
properly except not
printing.
Check whether or not
the specified paper is
used, and whether or
not the specified paper
is set inside out.
Set the specified paper
properly.
Faulty printer
mechanism --- Replace the printer mechanism.
No printing
The head is heated due
to continuous print,
etc.
Wait for some time. Reset automatically.
Faulty power supply Check whether or not
the specified
AC adapter is used.
Use the specified
AC adapter.
Non-recommended
paper Set print concentration higher with the DIP
switch.
Replace with the
recommended paper or
its equivalent.
Thin printing color
Faulty thermal head --- Replace the thermal
head.
Faulty printer
mechanism connection Check whether or not the printer mechanism
cable is connected
properly.
Connect the printer
mechanism cable
properly.
Foreign substance
adhered to the thermal
head or platen roller
Check the thermal
head and platen roller
for any foreign
substance.
Dip a cotton swab or
soft cloth in ethyl
alcohol and wipe off
the foreign substance.
Missing dots
Faulty thermal head --- Replace the thermal
head.
Faulty connection of
printer mechanism Check whether or not the printer mechanism
cable is connected
properly.
Connect the printer
mechanism cable
properly.
Missing dots in specific
section
Faulty thermal head --- Replace the thermal
head.
Low print quality Faulty printing paper Check whether or not
the specified printing
paper is used.
Replace with the
recommended paper or
its equivalent.

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16 CITIZEN
Phenomenon Cause Check Method Repair Method
Faulty power supply Check whether or not
the specified AC adapter
is used.
Use the specified
AC adapter.
Too much ink blot
Foreign substance
adhered to the thermal
head or platen roller
Check the thermal
head and platen roller
for any adhered foreign
substance.
Dip a cotton swab or
soft cloth in ethyl
alcohol and wipe off
the foreign substance.
Faulty printing paper Check whether or not
the specified printing
paper is used.
Replace with the
recommended paper
or its equivalent.
Blurred characters
Worn platen roller The platen roller is
worn out and slips
easily.
Replace the platen
roller unit.
*If the printer continues to print for a long time, the printed characters become thicker. If
printing is suspended and restarted, print concentration will change slightly. Print
concentration becomes lower if used at a low temperature.
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Phenomenon Cause Check Method Repair Method
Faulty connection of
motor connector Check the motor connector for its
connection.
Connect the
connector properly.
Faulty power supply Check whether or not
the specified
AC adapter is used.
Use the specified
AC adapter.
A printing paper feed
motor does not work or
malfunctions.
Faulty motor body Use a tester or
oscilloscope to measure
a supply voltage and
waveform.
If the supply voltage
and waveform are
normal, replace the
motor (printer
mechanism).
Faulty paper feed Check whether or not
the printing paper is
jamming or torn and
caught in a paper path.
Remove unnecessary
printing paper and
set properly.
Foreign substance in
the gear Check the motor gear for any foreign
substance.
Remove the foreign
substance.
Broken gear Check whether or not
the motor gear is
broken.
Replace the motor
(printer mechanism).
The printing paper is
not fed or fed
irregularly.
Faulty motor body Use a tester or
oscilloscope to measure
a supply voltage and
waveform.
If the supply voltage
and waveform are
normal, replace the
motor (printer
mechanism).

CBM-270 Service Manual
17 CITIZEN
·
··
·
P
PP
PN
NN
NE
EE
E S
SS
Se
ee
en
nn
ns
ss
so
oo
or
rr
r F
FF
Fa
aa
ai
ii
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e
Phenomenon Cause Check Method Repair Method
PNE is always
detected. Faulty sensor Use a tester to check whether or not a supply
voltage and signal are
normal.
Replace the PNE
sensor.
Irregularity between
the sensor and printing
paper
Check whether or not
the printing paper is
aligned with the core,
and whether or not it is
set properly in the
holder.
Set the printing
paper properly in the
holder. Align the
printing paper with
the center.
PNE is detected even
if there is enough
paper.
Foreign substance
caught by the sensor Check for any foreign substance. Remove the foreign substance.
Faulty sensor --- Replace the PNE
sensor.
Foreign substance
caught by the sensor Check for any foreign substance. Remove the foreign substance.
PNE is not detected.
Sensor exposed to the
direct sunshine or
strong light
Check operation,
avoiding the direct
sunshine or strong
light.
Use in a place free
from the direct
sunshine or strong
light.
·
··
·
P
PP
PE
EE
E S
SS
Se
ee
en
nn
ns
ss
so
oo
or
rr
r F
FF
Fa
aa
ail
ilil
ilu
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e
Phenomenon Cause Check Method Repair Method
PE is always detected. Faulty sensor Use a tester to check
whether or not a supply
voltage and signal are
normal.
Replace the PE sensor.
Faulty sensor --- Replace the PE sensor.
Foreign substance
caught by the sensor Check for any foreign substance. Remove the foreign substance.
PE is not detected.
Sensor exposed to the
direct sunshine or
strong light
Check operation,
avoiding the direct
sunshine or strong
light.
Use in a place free
from the direct
sunshine or strong
light.
*If PE is not detected with no printing paper set, the printer will print even if the paper is not set,
causing a trouble to the printer head, etc. If printing is performed in this condition, replace the
platen roller and head.

CBM-270 Service Manual
18 CITIZEN
·
··
·
L
LL
La
aa
ab
bb
be
ee
el
ll
l S
SS
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en
nn
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or
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lu
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((
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nn
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)
Phenomenon Cause Check Method Repair Method
Not set for the label
printer Check whether or not the DIP switch has
been set for the label
printer
Set the DIP switch for
the label printer.
Non-specified label
paper used --- Use the recommended
label paper.
A label is not detected.
Faulty sensor --- Replace the label
sensor.
·
··
·
O
OO
Ot
tt
th
hh
he
ee
er
rr
rs
ss
s (
((
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Phenomenon Cause Check Method Repair Method
At power-on, the
PAPER and ERROR
lamps remain
illuminated.
Faulty control board
---
Replace the control
board.
At power-on, the
ERROR lamp blinks. Faulty memory --- Replace the memory or control board.
No Kanji ROM Check whether or not
the printer is for
oversea use.
Replace the control
board with one for
domestic use or
attach the Kanji
ROM.
Kanji is not printed.
Faulty Kanji ROM --- Replace the Kanji
ROM.
Erroneous printing or
malfunctioning The printer is used in a noisy place. Check whether or not there is any noise
emitting object around
the printer.
Change the place.
A printer body or
internal temperature
is high.
Bad working
environment Check the working environment and
installation site.
Move the printer to a
well-ventilated place
within the specified
temperature range.
The ERROR lamp
blinks during
operation.
A macro is running. In macro execution,
check whether or not
manual operation
(macro execution by the
FEED switch) is
selected.
Press the FEED
switch.
The PAPER lamp
blinks while being
used as the label
printer.
The printer has
discharged the paper
and is cutting it.
Check whether or not a
paper discharge
command is being
executed.
Cut the paper and
press the FEED
switch.

CBM-270 Service Manual
19 CITIZEN
5
55
5.
..
.S
SS
SE
EE
ER
RR
RV
VV
VI
II
IC
CC
CE
EE
E P
PP
PA
AA
AR
RR
RT
TT
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SS
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II
IS
SS
ST
TT
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5
55
5.
..
.1
11
1P
PP
Pa
aa
ar
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rt
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ee
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mm
m 1/1
Ref.No. Parts No. Description Q'ty Remarks
1-01
1-02
1-03
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17-01
17-02
17-03
17-04
17-05
17-06
17-07
17-08
17-09
17-10
17-11
17-12
17-13
17-14
17-15
27ADJ
27ADU
27ADE
E62040500
E62010830
E5200-350
E6220-640
E4035-850
E40000220
LT286
E62020360
E6302-430
E4035-720
E4900-430
E4000-970
E6611-405
E8009-020
E77001-320
E77001-325
E77001-330
E77001-335
E77001-340
E77001-345
E77001-350
E77001-355
E77001-360
E77001-365
E77001-370
E77001-375
E77001-380
E77001-385
E77001-390
AC Adapter 27AD with JPN Cord, $ = 140
AC Adapter 27AD with USA Cord, $ = 140
AC Adapter 27AD with EUR Cord, $ = 140
Printer Cover 270
Paper Set Label 270 SEC-2608
Upper Cover 270
Operation Panel Sheet 270
Paper Cutter 270
FG Cable SEC-2001-2
Operation Panel Board Assembly
Printer Mechanism LT-286
Bottom Cover
Rubber Foot SEC-2541
Shielding Plate
FFC 270-02 SEC-2310
910 PE Holder Assembly
Paper Hook
Label Sensor Assembly
270R Main Assembly JPN
270R Main Assembly USA
270R Main Assembly EUR
270P Main Assembly JPN
270P Main Assembly USA/EUR
270R Main Assembly JPN for Interlabel Use
270R Main Assembly USA for Interlabel Use
270R Main Assembly EUR for Interlabel Use
270P Main Assembly JPN for Interlabel Use
270P Main Assembly USA/EUR for Interlabel Use
270R Main Assembly JPN for Black Mark Use
270R Main Assembly USA for Black Mark Use
270R Main Assembly EUR for Black Mark Use
270P Main Assembly JPN for Black Mark Use
270P Main Assembly USA/EUR for Black Mark Use
(1)
(1)
(1)
1
1
1
1
1
1
1
1
1
4
1
1
1
1
1
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)

CBM-270 Service Manual
20 CITIZEN
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55
5.
..
.2
22
2D
DD
Di
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is
ss
sa
aa
ass
ssss
sse
ee
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