Citizen CT-S4000 User manual

Service Manual
LINE THERMAL PRINTER
MODEL CT-S4000
Rev. 1.00 Issued on Junel 5, 2007

CT-S4000 Service Manual
CITIZEN is a registered trade mark of CITIZEN WATCH CO., LTD., Japan.
CITIZEN es una marca registrada de CITIZEN WATCH CO., LTD., Japón.
２
REVISION
Rev. Date Comment
0.00 2007/6/5 Newly issued

CT-S4000 Service Manual
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CONTENTS
INTRODUCTION....................................................................................................................................... 4
1. DISASSEMBLY AND REASSEMBLY ..............................................................................................4
1.1 Tools Used.........................................................................................................................................4
1.2 Disassembly Procedure ...................................................................................................................5
1.2.1 Disassembly of Unit...................................................................................................................5
1.2.2 Disassembling Mechanism Unit...............................................................................................7
1.2.3 Disassembling COVER...............................................................................................................9
1.2.4 Disassembling SA PLATEN .......................................................................................................9
1.2.5 Disassembling HOLDER, PAPER ............................................................................................10
1.2.6 Disassembling OPE-PANE.......................................................................................................10
1.3 Reassembly Procedure ..................................................................................................................10
1.4 Lubrication.......................................................................................................................................11
2. TROUBLESHOOTING....................................................................................................................... 12
2.1 Error Indication...............................................................................................................................12
2.2 Troubleshooting Procedure...........................................................................................................14
2.3 Troubleshooting Guide ..................................................................................................................14
3. SERVICE PARTS LIST .....................................................................................................................18
3.1 Parts List for Mechanism...............................................................................................................18
3.2 Exploded View of Mechanism.......................................................................................................21
3.3 List of Electric Parts .......................................................................................................................26
3.4 Parts Configuration ........................................................................................................................27
3.4.1 Main Control Board..................................................................................................................27
3.4.2 Serial Interface Board.............................................................................................................28
3.4.3 Parallel Interface Board..........................................................................................................29
4. CIRCUIT DIAGRAM .........................................................................................................................30
4.1 Main Control Board ........................................................................................................................30
4.2 Serial Interface Board....................................................................................................................32
4.3 Parallel Interface Board.................................................................................................................33

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INTRODUCTION
This manual describes the disassembly, reassembly, and maintenance procedures of the line thermal
printer CT-S4000.
1. DISASSEMBLY AND REASSEMBLY
Notes the following items when maintaining the printer.
• Do not disassemble, reassemble, or adjust the printer unnecessarily when the printer operation is
satisfactory.
• Do not loosen the screws fixing each component carelessly.
• After finishing inspection, perform checking for normality before turning on the printer.
• Pay attention not to leave the part or screws used for maintenance inside the printer.
• When handling the print head and electronic components, pay attention to static electricity.
• When disassembling or reassembling the printer, check the wiring and cord for damage. Pay
attention not to lay the wiring and cord by force.
• Lubricate the components as necessary when reassembling them.
1.1 Tools Used
• Phillips screwdriver #0, #1, and #2
• Tweezers
• Long-nose pliers
• Oil brush
• Nipper

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1.2 Disassembly Procedure
1.2.1 Disassembly of Unit
1. Removing SA IF PCB
・Remove two M3x6(ST) screws.
・Remove SA IF PCB.
(When reassembling, insert the connector correctly.)
2. Removing CASE
・Open COVER and remove two M3x6(ST) screws.
・Remove FRAME, BOTTOM from the two hooks on the
front of CASE bottom, remove FRAME, BOTTOM from
two hooks on the right and left of the CASE, and lift
CASE for removal.
(Remove three connectors while lifting CASE.)
3. Removing Power Unit
・Remove the connector on UNIT MAIN PWB and remove cable from the fixed groove.
・Remove the two M3x6(ST) screws from the bottom and remove the power unit.
M3x6 (ST)
M3x6 (ST)
Hooks
M3x6 (ST)
Connector to remove
Fixed groove
Connectors to
remove:
One in left figure
Two in right figure

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4. Removing Mechanism Unit
・Remove four M3x6(ST) screws. (2 places in the front and 2 places in the rear bottom)
・Disconnect all connectors on the PCB.
・Remove the mechanism unit.
5. Removing UNIT, MAIN PCB
・Remove four M3x6(ST) screws.
・Detach the power switch from the switch guide of
FRAME, BOTTOM and then remove UNIT, MAIN PCB.
M3x6 (ST)
Connectors to be disconnected
* In addition, remove one
connector at the left.
M3x6 (ST)

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1.2.2 Disassembling Mechanism Unit
1. Removing UNIT, AUT CUTTER
・Remove two M3x6(ST) screws from both sides.
・Broaden FRAME,MAIN a little and remove UNIT, AUT CUTTER.
* Be sure not to add deformation to FRAME, MAIN by broadening excessively.
2. Removing LEVER, COVER LOCK2
・Remove SPRING, COVER LOCK LEVER from LEVER, COVER LOCK1.
・Remove one M3x6(ST) screw.
・From FRAME, MAIN remove LEVER, COVER LOCK1.
3. Removing HOLDER, SPRING HEAD
・Broaden FRAME, MAIN a little and remove HOLDER, SPRING HEAD.
* Be careful not to add excessive deformation to FRAME, MAIN.
* Be sure not to have SPRING, HEAD lost in removal.
4. Removing SA HEAD
・Broaden FRAME, MAIN a little and remove SA HEAD.
* Be careful not to add excessive deformation to FRAME, MAIN.
SPRING, COVER LOCK LEVER
M3x6 (ST)
LEVER, COVER
LOCK1
Remove in arrow
direction.
HOLDER, SPRING HEAD
SA HEAD

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5. Removing HOLDER, PAPER
・Remove one M1.7x7(BT) screw holding SWITCH, COVER OPEN of HOLDER, PAPER in the
right.
・Remove four M3x6(BT) screws from both sides.
・Broaden FRAME, MAIN a little and remove HOLDER, PAPER.
* Be careful not to add excessive deformation to FRAME, MAIN.
* Be sure not to have DAMPER and HEAD SP lost when removing HOLDER, PAPER.
6. Removing HOLDER, GEAR
・Remove one M3x6(ST) screw.
・Remove HOLDER, GEAR and GEAR, REDUCTION.
7. Removing SA MOTOR
・Remove two M3x6(ST) screws and detach SA MOTOR.
M3x6 (ST)
M3x6 (ST)
M3x6 (BT)
SWITCH, COVER OPEN
M1.7x7 (BT)
DAMPER and HEAD SP

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1.2.3 Disassembling COVER
1. Removing COVER
・Remove COVER from CASE.
2. Removing CABLE, HOLDER and HOLDER, PLATEN
・Remove four M3x10(BT) screws and detach CABLE,
HOLDER1, 2 and HOLDER, PLATEN.
1.2.4 Disassembling SA PLATEN
1. Remove M2x4 (BT) screw and detach BLADE, FIXED.
2. Remove two M3x6 (BT) screws of COVER, SENSOR.
Move these portions inward.
Remove COVER from CASE.
M3x10 (BT)
M2x4 (BT) M3x6 (BT)

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1.2.5 Disassembling HOLDER, PAPER
1. Remove UNIT, PNE SENSOR.
2. Remove M1.7x7 (BT) screw and detach SW, COVER OPEN.
3. Remove M2.6x6 (BT) screw and detach SA, SUB PCB, PE SENSOR.
4. Remove SHAFT, PAPER ROLLER (4 pieces)
1.2.6 Disassembling OPE-PANE
1. Remove two M3x10(BT) screws and detach SA, PCB,
OPE-PANE from CASE.
2. Remove CONDUCTOR, LED.
1.3 Reassembly Procedure
Reverse the procedure in “1.2 Disassembly Procedure”.
UNIT, PNE SENSOR SW, COVER OPEN
M1.7x7 (BT)
SA, SUB PCB, PE SENSOR
M2.6x6 (BT)
M3x10 (BT)

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1.4 Lubrication
(1) Oil (Grease)
Furoyll G-943 (Kanto Kasei Co., Ltd.)
(2) Lubrication points

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2. TROUBLESHOOTING
2.1 Error Indication
zPaper end
Paper out is detected in two steps: paper near-end and paper end. ERROR LED will light
when the paper is empty. If paper end is detected, refill the paper. If the printer cover is open,
a paper-end is detected.
zPrinter cover open
During printing, do not open the printer cover. If you open the printer cover accidentally, the
ERROR LED blinks. Check the paper, pull the paper straightforward several cm (or inches)
out of the printer, and then close the printer cover. Printing resumes automatically. Sending a
command to resume printing may be required depending on the memory switch setting.
zThermal head overheat
When you print dense characters or dark image, the head temperature rises. If the head
temperature exceeds a specified level, the printer stops printing operation and waits till the
head temperature is lowered. During waiting, the ERROR LED blinks. When the head
temperature is lowered, printing resumes automatically.
zCutter lock
If the cutter blade stops operating due to paper jam or the like, the ERROR LED blinks.
Remove the cause of the trouble and press the FEED button. If the blade still does not move
and the printer cover cannot be opened.In this case, do not open the paper cover forcibly.
Insert a Phillips screwdriver (size #1) into the cutter lock releasing feed hole and turn it in the
direction of arrow (clockwise).
When you find that both ends of the blade reached the lowest position, stop turning the
screwdriver. Open the cover and follow the procedure of removing jam or other cause of
trouble.

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zBlack Mark detection error (in Black Mark mode)
When Black Mark cannot be detected even if a certain amount of paper feed is carried out for
Black mark detection, a Black Mark detection error occurs. If black detection continues more
than the specified period, a No Paper condition is assumed and the same error as No Paper is
indicated.
Lighting and blinking status of each error including the above is shown below.
Caution: In many cases, “Low voltage error” is caused by blown F2 fuse.Please check the
conduction of F2 fuse.

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2.2 Troubleshooting Procedure
When a trouble occurs, confirm its phenomenon, locate a defective part in accordance with “2.2
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 to locate hidden defective parts.
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 fewer misjudgments.
2.3 Troubleshooting Guide
• Power Supply Failure
Phenomenon Cause Check Method Remedy
The AC cable is not
connected.
— Connect AC cable.
No power
(POWER lamp not
illuminated) The fuse is gone. Check whether the
specified fuse is used.
Use the specified fuse.
Faulty control PCB assy — Replace the control PCB
assy.
The fuse immediately
goes again after
replacing with a new one. The circuit drive power is
abnormal.
Use instruments such as
tester to measure circuit
driving voltage.
Replace the control PCB
assy.
* If the fuse is gone with the specified AC adapter used, it is likely that the thermal head unit or control
PCB assy is defective. Replace either defective one. Check wiring for drawer cable and interface
cable.

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• Printing failure
Phenomenon Cause Check Method Remedy
Faulty control PCB assy — Replace the control PCB
assy.
Failed contact/connection
of thermal head
connector
Check
contact/connection
condition.
Re-insert thermal head
connector.
No printing
Faulty thermal head — Replace the thermal
head.
Faulty contact/connection
in thermal head
connector
Check contact/conection
conditions.
Re-insert thermal head
connector.
Partly not printed
Faulty thermal head — Replace the thermal
head.
Low output voltage Check the supply voltage
with tester or others.
Use within specified
voltage range.
Faulty thermal head — Replace the thermal
head.
Foreign substance is
adhered to the thermal
head.
Check whether any
foreign substances are
adhered to the head.
Wipe foreign materials
with swab or soft cloth
immersed with ethyl
alcohol.
Non-recommended
paper is used.
Check whether the paper
being used meets the
specification.
Replace it with the
specified paper.
Faint printout or uneven
printout
Faulty mounting of the
platen roller
Check mounting
condition of the platen
roller.
Mount the platen roller
properly.

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• Paper feed failure
Phenomenon Cause Check Method Remedy
Faulty connection of the
motor connector
Check the connector
connection.
Connect the connector
correctly.
Failed motor’s main unit Use tester or
oscilloscope or other
instrument to measure
supply voltage.
If the supply voltage is
normal, replace the
motor.
Low output voltage Check the supply voltage
with tester or others.
Use within specified
voltage range.
Faulty control PCB assy — Replace the control PCB
assy.
Faulty mounting of the
platen roller
Check mounting
condition of the platen
roller.
Mount the platen roller
properly.
Paper feed failure Check that no paper is
jammed, torn or caught in
the paper path.
Remove unnecessary
paper and set correctly.
Paper is not fed or
jammed.
Foreign substance in the
gear or broken gear
Remove the gear holder
and check for any foreign
substance caught in the
gears or any breakage of
the gears.
Eliminate the foreign
substance. If the gear is
broken, replace it with
new one.
• Faulty sensor
Phenomenon Cause Check Method Remedy
Faulty paper sensor Replace the SA SUB
PWB PE SENSOR.
Faulty paper near-end
sensor
Check whether the
ERROR LED flickers if
paper expires. Replace the SA PNE
SENSOR.
Foreign substance is
attached to the paper
sensor
Check whether any
foreign substances are
adhered to the paper
sensor.
Remove the foreign
substance.
Failed detection of paper
feed
Failed detection of
paper’s near-end
Faulty connection of the
paper sensor connector
Check the connector
connection.
Connect the connector
correctly.

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• Faulty auto cutter
Phenomenon Cause Check Method Remedy
Faulty connection of the
auto cutter connector
Check the connecting
condition of the auto
cutter connector.
Connect the connector
correctly.
Failure in auto-cutter’s
main unit
Use tester or
oscilloscope or other
instrument to measure
supply voltage.
If the supply voltage is
normal, replace the auto
cutter.
No operation of
auto-cutter
Paper feed failure
(Paper jam)
Check that no paper is
jammed, torn or caught in
the paper path.
Remove unnecessary
paper and set correctly.

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3. SERVICE PARTS LIST
3.1 Parts List for Mechanism
QTY
No. PARTS No. DESCRIPTION -DC REMARKS
COVER ASSY
1 TB56202-10F COVER,WT (1) (1) WHITE
TB56202-00F COVER,WT (1) (1) WHITE OLD TYPE
TB56209-10F COVER,BK (1) (1) BLACK
TB56209-00F COVER,BK (1) (1) BLACK OLD TYPE
TB56210-10F COVER,GR (1) (1) GRAY
TB56210-00F COVER,GR (1) (1) GRAY OLD TYPE
2 TB44202-00F HOLDER,PLATEN 1 1
3 TB28511-00F SA,PLATEN 1 1
4 23SEC-3697 BUSHING,PLATEN 2 2
5 TB44213-00F COVER,SENSOR 1 1
6 TB66710-00F SA SUB PCB JAM SENSOR 1 1
7 TB66711-00F SA SUB PCB BM SENSOR 1 1 BLACK MARK OPTION
8 TB66709-00F SA SUB PCB LABEL SENSOR 2 1 1 BLACK MARK & LABEL OPTION
9 TB44208-00F HOLDER,CABLE1 1 1
10 TB44209-00F HOLDER,CABLE2 1 1
11 TB54103-00F COVER,CABLE R 1 1
12 TB54104-00F COVER,CABLE L 1 1
13 E60340-000F E-RING,4.0 2 2
14 TB24103-00F BLADE,FIXED 1 1
15 E11730-060F SCREW,PHT(BT#3),M3.0×6 2 2
16 E11730-100F SCREW,PHT(BT#3),M3.0×10 4 4
17 E13520-040F SCREW,No.0,PHT(BT#3),M2.0×4 1 1
18 TB24111-00F CUTTER,PAPER 1 1
19 TB24108-00F CUTTER,PAPER 1 1 OLD TYPE
20 E11726-080F SCREW,PHT(BT#3),M2.6×8 2 2
21 E14220-030F SCREW,No.0,PHT(ST#3),M2.0×3 2 2 OLD TYPE
22 TB67709-00F CABLE,CUTTER PAPER 1 1
23 TB56216-00F COVER,CUTTER PAPER 1 1
FRAME,MAIN ASSY
25 TB44101-00F FRAME,MAIN 1 1
26 TB14701-00F SA,HEAD 1 1
27 TB44105-00F HOLDER,SPRING HEAD 1 1
28 700021-00 SPRING,HEAD 3 3
29 25-0347 FFC 1 1
30 600378-00 HOLDER,GEAR 1 1
31 600377-00 GEAR,REDUCTION 1 1
32 TA25702 MOTOR ASSY 1 1
33 TB44103-00F LEVER,COVER LOCK 1 1 1
34 TB44104-00F LEVER,COVER LOCK 2 1 1
35 TB56203-00F KNOB,OPEN 1 1
36 700014-10 LOCK LEVER SPRING 1 1
37 TB24109-00F SHEET,CUTTER 1 1
38 TB54102-00F SHEET,FRAME MAIN 1 1
40 E11130-060F SCREW,PHT(ST#3),M3.0×6 6 6
42 E11730-060F SCREW,PHT(BT#3),M3.0×6 1 1
45 TB29801-00F UNIT,AUTO CUTTER 1 1

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QTY
No. PARTS No. DESCRIPTION -DC REMARKS
HOLDER,PAPER ASSY
50 TB44211-00F HOLDER,PAPER 1 1
51 TB22001-00F SHAFT,PAPER ROLLER 4 4
52 TB94101-00F SHEET,PAPER HOLDER 1 1
53 TB66712-00F SA COVEROPEN SENSOR & SUB PCB
PE SENSOR
1 1
54 TB66805-00F UNIT,SUB PCB PNE SENSOR 1 1
55 TB66708-00F SA SUB PCB LABEL SENSOR1 1 1 LABEL OPTION
56 TB44205-00F PARTITION,PAPER 1 1
57 E11726-080F SCREW,PHT(BT#3),M2.6×8 1 1
58 E00530-080DF SCREW,BH,M3.0×8 1 1
59 E13517-070F SCREW,No.0,PHT(BT#3),M1.7×7 2 2
60 TB44207-00F DAMPER 2 2
61 700018-00 SPRING,DAMPER 2 2
62 TB56211-00F CASE,WH (1) (1) WHITE
TB56221-00F CASE,WH (1) (1) WHITE BLACK MARK & LABEL
OPTION
TB56217-00F CASE,BK (1) (1) BLACK
TB56227-00F CASE,BK (1) (1) BLACK BLACK MARK & LABEL
OPTION
TB56218-00F CASE,GR (1) (1) GRAY
TB56228-00F CASE,GR (1) (1) GRAY BLACK MARK & LABEL
OPTION
63 TB56204-00F CONDUCTOR,LED 1 1
64 ＴＢ66707-00Ｆ SA,SUB PCB OPEPANE 1 1
65 E11730-100F SCREW,PHT(BT#3),M3.0×10 2 2
66 E11130-060F SCREW,PHT(ST#3),M3.0×6 12 12
67 E16330-060F SCREW,PHT(ST#3 OUTTW),
M3.0×6
1 1
68 E11730-060F SCREW,PHT(BT#3),M3.0×6 7 7
73 TB56205-00F COVER,VOLUME ADJUST 1 1 BLACK MARK & LABEL OPTION
74 TB59101-00F STRAP,VOLUME COVER 1 1 BLACK MARK & LABEL OPTION

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QTY
No. PARTS No. DESCRIPTION -DC REMARKS
80 TB66716-00F SA POWER SOURCE 1
81 TB66801-00F UNIT,MAIN PCB (WITH ROM) CJ (1) (1) JAPAN MODEL
TB66821-00F UNIT,MAIN PCB (WITH ROM) CJ M (1) (1) JAPAN MODEL WITH BLACK MARK
OPTION
TB66841-00F UNIT,MAIN PCB (WITH ROM) CJ L (1) (1) JAPAN MODEL WITH LABEL
OPTION
TB66802-00F UNIT,MAIN PCB (WITH ROM) CU (1) (1) US&EURO MODEL
TB66822-00F UNIT,MAIN PCB (WITH ROM) CU M (1) (1) US&EURO MODEL WITH BLACK
MARK OPTION
TB66842-00F UNIT,MAIN PCB (WITH ROM) CU L (1) (1) US&EURO MODEL WITH LABEL
OPTION
TB66803-00F UNIT,MAIN PCB (WITH ROM) CK (1) (1) KOREA MODEL
TB66823-00F UNIT,MAIN PCB (WITH ROM) CK M (1) (1) KOREA MODEL WITH BLACK MARK
OPTION
TB66843-00F UNIT,MAIN PCB (WITH ROM) CK L (1) (1) KOREA MODEL WITH LABEL
OPTION
TB66804-00F UNIT,MAIN PCB (WITH ROM) CC (1) (1) CHINA MODEL
TB66824-00F UNIT,MAIN PCB (WITH ROM) CC M (1) (1) CHINA MODEL WITH BLACK MARK
OPTION
TB66844-00F UNIT,MAIN PCB (WITH ROM) CC L (1) (1) CHINA MODEL WITH LABEL
OPTION
TB66807-00F UNIT,MAIN PCB (WITH ROM) CCT (1) (1) CHINA BIG 5 MODEL
TB66827-00F UNIT,MAIN PCB (WITH ROM) CT M (1) (1) CHINA BIG 5 MODEL WITH BLACK
MARK OPTION
TB66847-00F UNIT,MAIN PCB (WITH ROM) CT L (1) (1) CHINA BIG 5 MODEL WITH LABEL
OPTION
82 TA66709-00F SA,SUB PCB POWER 1
83 TA66811-0 UNIT,SUB PCB I/F PARALLEL (1) (1) PARALLEL
84 TB66831-00F UNIT,SUB PCB I/F SERIAL (MM) (1) (1) SERIAL (MM)
85 TA66832-00F UNIT,SUB PCB I/F SERIAL (INCH) (1) (1) SERIAL (INCH)
86 TA54107-0 PLATE,I/F COVER (1) (1) USB Only MODEL