Citizen PPU-231 User manual

CITIZEN
Service Manual
Model: PPU-231
Line Thermal
Printer/Presenter Unit
Rev. 1.00 Newly issued on May 12, 1999
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PPU-231 Service Manual
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INTRODUCTION
This manual describes the disassembly, reassembly, and maintenance procedures of the line
thermal presenter/printer PPU-231. It is intended for field maintenance men.
FEATURES
Packed with features, this small line thermal printer/presenter has a wide range of uses: a termi-
nal device for various data communication, an instrumentation terminal, an outdoor information
terminal or a device that prints various tickets and coupons. Please read this manual thor-
oughly before you use the printer/presenter to ensure it is implemented correctly.
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. You can choose where you attach the power connector, interface connector, etc.
8. Large diameter paper roll support

PPU-231 Service Manual
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1. HANDLING AND MAINTENANCE OF PRINTER ..........................................................................4
2. SPECIFICATIONS ...............................................................................................................................5
2.1 Basic Specifications ....................................................................................................................5
3. DISASSEMBLY AND REASSEMBLY ................................................................................................6
3.1 Disassembly Procedure for PPU Unit.......................................................................................6
3.2 Disassembly Procedure for PRU Unit.......................................................................................9
3.3 Disassembly Procedure for PMU Unit....................................................................................13
3.4 Reassembly Procedure..............................................................................................................15
4. TROUBLESHOOTING ......................................................................................................................16
4.1 Troubleshooting Procedure..………………………………………………………………..………16
4.2 Troubleshooting Guide.. ..…………………………………………………………………….……..16
5. SERVICE PARTS LIST ......................................................................................................................19
5.1 Parts List for Mechanism.........................................................................................................19
5.2 Disassembly Drawing...............................................................................................................21
5.3 Parts List for Control Board ...................................................................................................24
5.4 Parts Layout Drawing..............................................................................................................26
6. DRAWING...........................................................................................................................................29
6.1 Block Diagram..........................................................................................................................30
6.2 Circuit Diagram........................................................................................................................31
7. OUTER DIMENSION ........................................................................................................................32
h: For the printer mechanism LT380V and auto cutter ACS-230F, refer to the separate Service
Manuals.

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See the User’s Manual coming with the printer body.

PPU-231 Service Manual
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Item Description
Printing system Line thermal dot printing
Printing width 72 mm (576 dots/line)
Dot density 8 dots/mm (Width, Length)
Printing speed 62.5 mm/sec. (At maximum speed), (500-dot line/sec.)
Printing columns and
character size 48 columns (12´24 FontA) 1.25´3.00 mm
64 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 (1/203 inch at minimum)
Character types Alphanumeric, Japanese, International characters
Bar code type UPC-A, JAN(EAN) 13-/8-column, ITF, CODE 39, CODE 128, CODABAR
Paper Thermal paper roll
Width:80 mm
Outer diameter: f203 mm (Max.), (When using PHU)
Inter diameter: f25.4 mm (Max.)
Thickness: 60~85 µm
Recommended paper TF-50KS-E, E2C (made by Nippon Seishi)
Presenter Length of normal issue
64
~305 mm (Can be adapted to issue 457 mm lengths)
2.5
~12 inches (Can be adapted to issue 18-inch lengths)
Interface Serial (RS-232C), Parallel (Conforms to CENTRONICS)
Input buffer 4 KB
Command ESC/POS
Sensors Paper near end sensor (When using PHU, position adjustable)
Paper end sensor (When using PMU)
Black mark Sensor (Option)
Supply voltage 24 V DC +/- 7%
Power consumption 100 W
Weight PPU: 1.6 kg (Control PCB included)
PHU: 0.9 kg (Paper roll excluded)
Outer dimensions PPU: 144.7(W)´160(D) ´172(H) mm
PHU: 132.2(W)´120(D) ´125.2(H) mm
*: Protruding parts are not included.
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:
Pulse resistance : 50 million pulses or more (Print rate 12.5%)
Wear resistance: 30 km or more (With recommended thermal paper
at normal temperature and humidity)
Auto cutter life:
300,000 cuts (With recommended thermal paper at normal tempera-
ture and humidity)

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For maintenance operations, note the following:
Notes:
(1) Do not disassemble/reassemble or adjust the machine, if it functions properly. Particularly,
do not loosen screws on any component, unless necessary.
(2) After completing an inspection and before turning on the power, be sure to check that there is
no abnormality.
(3) Never try to print without paper installed in the printer. Check that the printing paper is
properly set.
(4) During maintenance, be careful not to leave parts or screws unattached or loose inside the
printer.
(5) When handling the thermal head and control board,do not use gloves or other aids which can
easily cause static electricity. Also, avoid a place where static electricity can occur.
(6) When disassembling or reassembling, check cables and boards for any damage. Do not run
cables into a narrow space or set cables in improper positions.
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(1) Disconnect the two connectors from the control board and detach the PRU unit after re-
moving the four screws.
PRU Unit

PPU-231 Service Manual
– 7– CITIZEN
(2) Release the lock of the FCC connector, disconnect the FCC from the control board, remove
the two springs, pull out the knob, unfasten the two screws, and detach the PMU unit.
(3) Disconnect the connectors of power connector assy, power switch assy, feed switch assy, and
I/F connector assy from the control board.
PMU Unit
Feed SwitchAssy
Power Switch Assy
Power Connector Assy
I/F ConnectorAssy
Knob
Spring

PPU-231 Service Manual
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(4) Disengage the four claws that are holding the control board and detach the control board.
(5) Remove the side frame L and R.
Control Board
DIP Switch
Side Frame R
Side Frame L
Center Frame

PPU-231 Service Manual
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(1) Remove the four screws from the PRU unit, that are fixing the cutter bracket. Then, re-
move the auto cutter unit.
(2) Push the U-shaped part of the door and remove the door. Then, pull out the roller shaft
and remove the roller.
Presenter Bracket
Roller
Roller Shaft Door

PPU-231 Service Manual
– 10 – CITIZEN
(3) Remove the four screws that are fixing the upper case and detach the upper case.
(4) Remove the feed roller assy and PE sensor assy by pulling them horizontally.
Feed Roller Assy
Upper Case
PE Sensor

PPU-231 Service Manual
– 11 – CITIZEN
(5) Pull out the roller shafts and remove the rollers.
(6) Release the claws that are fixing the feed roller gears and remove the feed rollers and
bushes.
Roller Shaft
Roller
Lower Case
Feed Roller
Feed Roller Gear
Bush

PPU-231 Service Manual
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(7) Pull out the motor gear, remove the two screws, and detach the motor.
(8) Disengage the E-ring, and remove the drive gear, clutch spring, and slip gear in that order.
Motor Gear
Side Plate
Motor
E-Ring
Slip Gear
Clutch Spring
Drive Gear

PPU-231 Service Manual
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(9) Remove the auto cutter from the presenter bracket and detach the paper guide, mouse plate
F2, and mouse plate R2.
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(1) Remove the four screws that are fixing the mechanism cover and release the claw that is
fixing the connect board. Then, remove the mechanism cover.
Presenter Bracket
Paper Guide
Auto Cutter
ACS-230F
Mouse Plate R2
Mouse Plate F2
Mechanism Cover
Connect PCB
Printer Mechanism

PPU-231 Service Manual
– 14 – CITIZEN
(2) Disconnect the two connectors and one FPC from the connect board.
(3) Remove the two screws that are fixing the mechanism bracket and detach the printer
mechanism.
Connector (with Lock)
Connect Board
Mechanism Bracket
Printer Mechanism

PPU-231 Service Manual
– 15 – CITIZEN
(4) Unhook the springs and remove the cushion rollers.
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Reassemble each part in the reverse order of the disassembly procedures described in Sections
3.1 to 3.3.
Cushion Roller
Mechanism Cover
Spring

PPU-231 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.
lPhenomenon: 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.
lCause: Lists as many possible causes as possible. Guess a trouble cause out
of them and take its check method to specify the trouble cause.
lCheck Method: Describes a check method to specify a trouble cause.
lRemedy: Troubleshoot by taking a remedy described in this column.
By troubleshooting in accordance with the above-mentioned procedure, you can troubleshoot ef-
ficiently with fewer misjudgments.
4
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Phenomenon Cause Check Method Remedy
Faulty DC output volt-
age from the AC
adapter
Check whether the 24V
DC is output from the
AC adapter.
Replace the AC
adapter.
No printing
Faulty printer mecha-
nism Replace the printer mechanism unit.
Faint printout Faulty DC power supply
from the AC adapter Check whether the AC adapter has enough
power margin.
Replace the AC
adapter.
Missing dots Foreign substance is
adhered to the thermal
head.
Check whether any for-
eign substances are
adhered to the thermal
head.
Dip a cotton swab or
soft cloth in ethyl alco-
hol and wipe the foreign
substances with them.
Faulty DC power supply
from the AC adapter Check whether the AC adapter has enough
power margin.
Replace the AC
adapter.
Badly blurred
printout
Dirt is attached to the
thermal head. Check whether dirt is adhered to the thermal
head.
Dip a cotton swab or
soft cloth in ethyl alco-
hol and wipe away the
dirt.
Bad printing qual-
ity Faulty paper Check whether the pa- per meets the specifica-
tions.
Replace it with the
specified paper.

PPU-231 Service Manual
– 17 – CITIZEN
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Phenomenon Cause Check Method Remedy
Faulty connection of the
motor connector Check connection of the motor connector. Connect the connector correctly.
Faulty DC power supply
from the AC adapter Check whether the AC adapter has enough
power margin.
Replace the AC
adapter.
Paper feed motor
does not work or
does not run
smoothly.
Faulty printer mecha-
nism Replace the printer mechanism
Paper feed failure Check whether or not
the paper is jamming or
torn and caught in the
paper path.
Eliminate unnecessary
paper in the paper path
and set paper properly.
Foreign substance in
the gear Check whether any for- eign substance caught
in the platen gear or
motor gear in the
printer mechanism.
Eliminate the foreign
substance.
Paper is not fed or
fed irregularly
Broken gear Check for any breakage
of the platen gear or
motor gear in the
printer mechanism.
If it is broken, replace
the printer mechanism.
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Phenomenon Cause Check Method Remedy
Wear of the clutch Replace the clutch.
Paper being used is too
thick. Check the thickness of the paper. Change the paper.
Deformation of the pa-
per guide Check whether the pa- per guide is deformed or
not.
Replace the paper
guide.
DC power to the drive
motor is insufficient. Check whether the AC adapter has enough
power margin.
Replace theAC adapter.
Paper is not
ejected.
Faulty paper path Check whether paper is
left in the paper path. Eliminate the remain- ing paper.

PPU-231 Service Manual
– 18 – CITIZEN
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Phenomenon Cause Check Method Remedy
Faulty connection of the
motor connector Check connection of the motor connector. Connect the connector correctly.
Foreign substance in
the gear Check whether any for- eign substance caught
in the motor gear or
feed roller.
Eliminate the foreign
substance.
The roller does not
turn.
Broken gear Check for any breakage
of the feed roller gear,
gear in the clutch part,
or motor gear.
If broken, replace the
parts.
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Phenomenon Cause Check Method Remedy
Faulty paper sensor Check whether any for-
eign substances are
adhered to the window
of the paper sensor.
Eliminate the foreign
substance.
Does not detect
presence of paper.
Faulty connection of the
paper sensor Check connection of the paper sensor. Connect the connector correctly.
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Phenomenon Cause Check Method Remedy
Faulty connection of the
motor connector Check connection of the motor connector. Connect the connector correctly.
Paper feed failure
(Paper jam) Check whether the pa- per is jamming or not. Eliminate jammed pa- per in the paper path.
The cutter does not
functionl.
Faulty auto cutter Replace the auto cutter.
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Phenomenon Cause Check Method Remedy
Replace the control
board and check wheth-
er the problem is solved
or not.
If solved, replaced the
control board.
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PPU-231 Service Manual
– 19 – CITIZEN
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EXPLODEDVIEW 1/2
Ref. No. Parts No. Description Q'ty Remarks
1 E66201-070 Upper Case 1
2 E62040570 Door 1
3 E62020400 Lower Case 1
4 E6601-380 Side Plate 1
5E6612-090 Feed Roller 2
6 E8019-160 Feed Roller Gear 2
7 E8025-100 Bush 2
8 O-25 O-Ring P25 4C Silicon 50° 2
9 E8017-100 Motor FM-120RA1 (24V) 1
10 E8019-170 Motor Gear 1
11 76G57459 Screw M2´3 S Tite 10
12 E8024-120 Gear Shaft 1
13 E8019-180 Slip Gear 1
14 E8519-020 Clutch Spring 1
15 E8019-190 Drive Gear 1
16 E2.5 E-Ring E2.5 1
17 E8024-130 Roller Shaft 3
18 E8031-130 Roller 3
19 E6233-150 Presenter Bracket 1
20 23G22839 Screw M2.6´8 B Tite 12
21 E40000315 PE Sensor Assy 1
22 ACS230F Auto Cutter ACS-230F 1
23 E8022-140 Paper Guide 1
24 E8010-290 Mouse Plate F2 1
25 E8010-270 Mouse Plate R2 1
26 71G57473 Screw M2.3´5 S Tite 4
27 23G57466 Screw M2´6 S Tite 2
30 E8023-090 Mechanism Cover 1
31 E8031-140 Cushion Roller 2
32 Spring 2057 2
33 E6233-160 Mechanism Bracket 1
34 E70010905 Connect PCB 1
35 LT380V Printer Mechanism LT380V 1
36 E4900-640 Flat Cable 2

PPU-231 Service Manual
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EXPLODEDVIEW 2/2
Ref. No. Parts No. Description Q'ty Remarks
40 E8010-310 Center Frame 1
41 E8010-320 Side Frame L 1
42 E8010-330 Side Frame R 1
43 23G29538 Screw M3´5 S Tite 8
44 E8025-110 Locking Card Spacer KGLS-6RF 4
45 E8500-090 Edge Holder EHS-11U 2
46 E4035-870 Insulating Sheet 1
47 E8029-050 Knob 2
48 23G22821 Screw M3´8 S Tite 4
49 Spring 6612 2