Citizen CT-S300 User manual

LINE THERMAL PRINTER
MODEL CT-S300
Rev. 2.00 Issued on Oct. 7, 2004
Service Manual

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CT-S300 Service Manual
REVISION
Rev. No. Date Comment
Rev. 1.00 2004/01/16 Newly issued
Rev. 2.00 2004/10/07 Changed “5.1 Part List for Mechanism”
Added “5.3 Part List for PCB Control Assy”

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CT-S300 Service Manual
CONTENTS
INTRODUCTION ...................................................................................................................................... 1
1. FEATURES ............................................................................................................................................ 1
2. SPECIFICATIONS................................................................................................................................ 2
3. DISASSEMBLY AND REASSEMBLY ............................................................................................... 3
3.1 Tools Used ................................................................................................................................................ 3
3.2 Disassembly Procedure ............................................................................................................................ 4
3.2.1 Overall Disassembly ........................................................................................................................ 4
3.2.2 Disassembly of Mechanism Chassis Assembly ............................................................................... 5
3.2.3 Disassembly of Platen Assembly ..................................................................................................... 7
3.3 Reassembly Procedure ............................................................................................................................. 8
3.4 Lubrication ............................................................................................................................................... 8
4. TROUBLESHOOTING ........................................................................................................................ 9
4.1 Troubleshooting Procedure ...................................................................................................................... 9
4.2 Troubleshooting Guide ............................................................................................................................. 9
5. SERVICE PARTS LIST ...................................................................................................................... 13
5.1 Parts List for Mechanism ....................................................................................................................... 13
5.2 Exploded View of Mechanism ............................................................................................................... 15
5.3 Parts List for PCB Control Assy ............................................................................................................ 17
5.4 Main Board............................................................................................................................................. 18
6. CIRCUIT DIAGRAM ......................................................................................................................... 19
6.1 Main Board............................................................................................................................................. 19
6.2 Serial Interface ....................................................................................................................................... 20
6.3 Parallel Interface .................................................................................................................................... 21
7. EXTERNAL VIEW ............................................................................................................................. 22

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CT-S300 Service Manual
INTRODUCTION
This manual describes the disassembly, reassembly, and maintenance procedures of the line thermal printer CT-
S300.
1. FEATURES
• Compact design
• Paper drop-in mechanism that facilitates setting paper and cleaning the print head
• High-speed printing at 100 mm/s max.
• Low-noise printing
• Built-in input buffer
• Bar code printing
• Page mode enabling free layout of printing
• Registration of user-defined characters and logos into user memory
• Built-in Drawer Kick-out interface
• Auto cutter mechanism provided as a standard unit (auto cut/partial cut)
• Use of 80 mm- or 58 mm wide paper is available.
• Replaceable interface board
• A variety of selection of functions is available with the memory switch.
• Horizontal-, vertical-, or wall-mounting (option) is possible.
• Built-in buzzer
• Either power supply box type or AC adapter type is selectable.
• Various kinds of customization are permitted.
• 2-color printing

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CT-S300 Service Manual
Item Specifications
Model CT-S300-RF120 CT-S300-RF230
CT-S300-PF120 CT-S300-PF230
CT-S300-UF120 CT-S300-UF230
Print method Line thermal dot print method
Print width 72 mm/576 dots, (48 mm/384 dots) *1
Dot density 8 ×8 dots/mm (203 dpi)
Print speed 100 mm/s (Fastest, print density level 0), 800 dot lines/s)
Number of print columns *2 Font A: 48/42 (32/30) columns; 12 ×24 dots
( ) shows the value with Font B: 64/56 (42/40) columns; 9 ×17 dots
58 mm wide paper. Font C: 72/63 (48/45) columns; 8 ×16 dots
Character size Font A: 1.50 ×3.00 mm
Font B: 1.13 ×2.13 mm
Font C: 1.00 ×2.00 mm
Character type Alphanumeric, International, PC850/852/857/858/860/863/864/865/866/
WPC1252/Katakana/Thai code 18
User memory 256 KB (Capable of registering user-defined characters and logos)
Types of bar code UPC-A/E, JAN (EAN) 13/8 columns, ITF, CODE 39, CODE 128, CODABAR,
CODE 93
Line spacing 4.23 mm (1/6 inch)
Paper roll Thermal paper roll: 80 mm/58 mm ×φ83 mm
Paper thickness: 65-75 µm
Interfacing Serial (RS-232C compliant), Parallel (IEEE 1284 compliant), USB
Cash drawer interface 2 cash drawers are supported.
Input buffer 4K bytes/45 bytes
Supply voltage DC 24 V ±7%
Power consumption Approx. 70 W (in normal printing)
AC adapter Rated input: AC 100 to 240 V, 50/60 Hz, 150 VA
Rated output: DC 24 V, 2A
32AD-U 32AD-E
Weight Approx. 1.2 kg
Outside dimensions 145 (W) ×195 (D) ×121 (H) mm
Operating temperature and 5 to 40°C, 35 to 85% RH (No condensation)
humidity
Storage temperature and –20 to 60°C, 10 to 90% RH (No condensation)
humidity
Reliability Print head life: 100 km, 1 ×108pulses (At normal temperature/humidity with
recommended paper used)
Auto cutter life: 1 million cuts (At normal temperature/humidity with
recommended paper used)
Safety standard *3 UL, C-UL, FCC Class A TUV, GS, CE marking
Notes:
*1: Value in parentheses shows the case when a 58-mm wide paper roll is used.
*2: The number of printable columns is selectable with a DIP switch.
*3: Represents the safety standards acquired when CBM-made adapters (32AD series) are used.
2. SPECIFICATIONS
+0
−1
+0
−1

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CT-S300 Service Manual
3. DISASSEMBLY AND REASSEMBLY
Note the following items when maintaining the printer.
• Do not disassemble, reassemble, or adjust the printer unnecessarily when the printer is 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.
3.1 Tools Used
• Phillips screwdriver #0, #1, and #2
• Tweezers
• Long-nose pliers
• Oil brush
• Nipper
3.2 Disassembly Procedure
Disassembly procedure is explained in three categories: “Overall Disassembly”, “Disassembly of Mechanism
Chassis Assembly”, and “ Disassembly of Platen Assembly”.
3.3 Reasembly Procedure
Reverse the procedure in “3.2 Disassembly Procedure”.

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CT-S300 Service Manual
(2) Removing mechanism unit
• Remove the LED guide.
• Remove the two M3 ×8 (ST) screws.
• Remove the connectors and FFC from the control
board assembly.
• Remove the mechanism unit from the square hole
of the bottom chassis.
A
A
B
B
E
E
F
F
D
D
C
C
3.2 Disassembly Procedure
3.2.1 Overall Disassembly
(1) Removing top cover
• Place the printer in vertical state.
• Open the paper cover using the cover open lever.
• Remove the printer chassis from the four “hooks”
at the bottom of the top cover.
* Pay attention not to break the “hook”.
Mechanism unit
Square hole
Bottom chassis
M3 ×8 (ST)
Hook
Hook
LED guide

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CT-S300 Service Manual
(3) Removing interface board assembly
• Remove the two M3 ×6 (ST) screws.
• Remove the interface board assembly.
(4) Removing control board assembly
• Remove the two M3 ×6 (ST) screws.
• While removing the power switch from the switch
guide, remove the control board assembly.
Bottom chassis
3.2.2 Disassembly of Mechanism Chassis Assembly
(1) Removing auto cutter
• Remove the two M3 ×6 (ST) screws from both
sides.
• Widen the main chassis a little, remove the four
guide bosses, and remove the auto cutter.
(2) Removing center frame
• Remove the two M3 ×8 tapping (ST) screws
from both sides.
• Widen the main chassis a little and remove the
center frame while removing the four guide
bosses.
(3) Removing paper near-end lever assembly
• Remove the assembly from the center frame.
Control board assembly
M3 ×6 (ST)
Interface board assembly
M3 ×6 (ST)
Switch guide
Paper near-end lever assembly
Center frame
M3 ×8 tapping
screws [ST]
M3 ×8 (ST)
Auto cutter
Main chassis

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CT-S300 Service Manual
(4) Removing gear holder and reduction gear
• Remove them by removing the M3 ×6 (ST)
screw.
(5) Removing stepping motor
• Remove the M3 ×6 (ST) screw.
• While unhooking the flange of the motor, remove
the stepping motor.
Gear holder
Reduction gear
Stepping motor
M3 ×6 (ST)
(6) Removing open lever and lock lever
• Remove the EXT spring-01.
• While unhooking the “hook” of the open lever,
remove the open lever.
• Remove the lock lever.
* Note that removing the lock lever may result in
detaching the “Head support spring” to be
handled in (7).
Head support spring
(7) Removing head assembly
• Remove the head support springs holding the
head assembly at both sides.
• Remove the head assembly from the main
chassis.
Head assembly
Open lever
EXT spring-01
Lock lever
Hook

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CT-S300 Service Manual
3.2.3 Disassembly of Platen Assembly
(1) Removing platen assembly
• Remove the platen assembly by removing the two
M3 ×10 tapping (ST) screws.
Fixed blade
E ring (E4)
M3 ×10 (ST)
(2) Removing fixed blade.
• Remove the fixed blade by removing the M2 ×4
screw.
M2 ×4 (BT)
(3) Removing platen assembly
• Remove the E ring (E4) from the inside of the
platen gear.
• Shift the platen bushing of the platen gear to the
rubber roller side to remove it from the platen
holder.
• Removing platen assembly
* Note that the bushing at the opposite side of the
gear, when removed from the holder, may become
free.

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CT-S300 Service Manual
3.3 Reassembly Procedure
Reverse the procedure in “3.2. Disassembly Procedure”.
3.4 Lubrication
(1) Oil (Grease)
Furoyl G--943 (Kanto Kasei Co., Ltd.)
(2) Lubrication points
➀Gear holder shaft
➁Platen bearing
➂Platen bush periphery
➁➂
➂
➀

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CT-S300 Service Manual
4. TROUBLESHOOTING
4.1 Troubleshooting Procedure
When a trouble occurs, confirm its phenomenon, locate a defective part in accordance with 4.2 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. This allows you to specify 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: 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.
4.2 Troubleshooting Guide
•Power Supply Failure
Phenomenon
No power (POWER lamp
not illuminated)
The fuse immediately goes
again after replacing with
new one.
Cause
The AC adapter is not
connected.
The fuse is gone.
The control PCB assy is
defective.
The circuit drive power is
abnormal.
Check Method
—
Check whether any
unspecified power has been
used so far.
Check whether the
specified fuse is used.
—
With a DC voltmeter,
measure the circuit drive
voltage.
Remedy
Connect the specified AC
adapter.
Use the specified AC
adapter.
Use the specified fuse.
Replace the control PCB
assy.
Replace the control PCB
assy.
* If the fuse is gone with the specified AC voltage supplied to the AC adapter, it is likely that the thermal head unit
or control PCB assy is defective. Replace either defective one. Incidentally, check the wiring of the drawer and
interface cable.

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CT-S300 Service Manual
•Printing failure
Phenomenon
No printing
Partly not printed
Faint printout or uneven
printout
Cause
Faulty DC output voltage
from the AC adapter
Faulty control PCB assy
Faulty connection of the
thermal head connector
Faulty thermal head
Faulty connection of the
thermal head connector
Faulty thermal head
Faulty DC output voltage
from the AC adapter
Low DC output voltage
from the AC adapter
Faulty thermal head
Foreign substance is
adhered to the thermal
head.
Non-recommended paper
is used.
Faulty mounting of the
platen roller
Check Method
Check whether the
specified AC adapter is
used.
—
Check connection of the
thermal head connector.
—
Check connection of the
thermal head connector.
—
Check whether the
specified AC adapter is
used.
Check the DC voltage with
a DC voltmeter.
—
Check whether any foreign
substances are adhered to
the thermal head.
Check whether the paper
being used meets the
specification.
Check mounting condition
of the platen roller.
Remedy
Use the specified AC
adapter.
Replace the control PCB
assy.
Connect the thermal head
connector properly. Or
replace the head cable assy.
Replace the thermal head.
Connect the thermal head
connector properly. Or
replace the head cable assy.
Replace the thermal head.
Use the specified AC
adapter.
Supply the specified AC
voltage to the AC adapter.
Replace the thermal head.
Dip a cotton swab or soft
cloth in ethyl alcohol and
wipe the foreign substances
with them.
Replace it with the
specified paper.
Mount the platen roller
properly.

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CT-S300 Service Manual
Phenomenon
Paper is not fed or fed
irregularly
Cause
Faulty connection of the
motor connector
Defective motor
Faulty DC output voltage
from the AC adapter
Low DC output voltage
from the AC adapter
Faulty control PCB assy
Faulty mounting of the
platen roller
Paper feed failure
Foreign substance in the
gear
Broken gear
Check Method
Check connection of the
motor connector.
Measure the supply
voltage with a DC
voltmeter or oscilloscope.
Check whether the
specified AC adapter is
used.
Check the DC voltage with
a DC voltmeter.
—
Check mounting condition
of the platen roller.
Check whether or not the
paper is jamming or torn
and caught in the paper
path.
Remove the gear holder
and check for any foreign
substance caught in the
gears.
Remove the gear holder
and check for any breakage
of the gears.
Remedy
Connect the connector
correctly.
If the supply voltage is
normal, replace the motor.
Use the specified AC
adapter.
Supply the specified AC
voltage to the AC adapter.
Replace the control PCB
assy.
Mount the platen roller
properly.
Eliminate unnecessary
paper in the paper path and
set paper properly.
Eliminate the foreign
substance.
If the gear is broken,
replace it with new one.
•Paper feed failure

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CT-S300 Service Manual
Phenomenon
The cutter does not
function.
Cause
Faulty connection of the
auto cutter connector
Faulty DC output voltage
from the AC adapter
Defective auto cutter
Paper feed failure
(Paper jam)
Check Method
Check connection of the
auto cutter connector.
Check whether the
specified AC adapter is
used.
Measure the supply
voltage with a DC
voltmeter or oscilloscope.
Check whether or not the
paper is jamming or torn
and caught in the paper
path.
Remedy
Connect the connector
correctly.
Use the specified AC
adapter.
If the supply voltage is
normal, replace the auto
cutter.
Eliminate unnecessary
paper in the paper path and
set paper properly.
•Faulty auto cutter
•Faulty sensor
Phenomenon
Does not detect presence
of paper.
Does not detect paper near-
end status.
Cause
Faulty paper sensor
Foreign substance is
attached to the paper
sensor.
Faulty connection of the
paper sensor connector
Faulty paper near-end
sensor
Foreign substance is
attached to the paper near-
end sensor.
Faulty connection of the
paper near-end sensor
connector
Check Method
Check whether the ERROR
lamp flickers when paper is
out.
Check whether any foreign
substances are adhered to
the paper sensor.
Check connection of the
paper sensor connector.
Check whether the ERROR
lamp flickers when paper is
out.
Check whether any foreign
substances are adhered to
the paper near-end sensor.
Check connection of the
paper near-end sensor
connector.
Remedy
Replace the sensor PCB
assy.
Remove the foreign
substance.
Connect the connector
correctly.
Replace the paper near-end
sensor.
Remove the foreign
substance.
Connect the connector
correctly.

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CT-S300 Service Manual
5. SERVICE PARTS LIST
5.1 Parts List for Mechanism
Ref.
No. Parts No. Description RPU Remarks
1 100118-00 Top Cover Assy
1 100118-00-B Top Cover Assy (Black)
2 600387-00 Roller 1 1 1
3 600370-00 Printer Cover 1 1 1
3 600370-00-B Printer Cover (Black)
4 600371-00 LED Guide 1 1 1
5 100113-00 Paper Holder Assy
6 600377-00 Reduction Gear 1 1 1
7 600378-00 Gear Holder 1 1 1
8 600379-00 Open Lever 1 1 1
9 500316-00 Plate Spring 1 1 1
600383-00 (Sensor Cover) 1 1 1 Black mark option
600388-00 (Wire Stopper) 1 1 1 Black mark option
10 100114-00 Bottom Chassis Assy
11 600381-00 Power Case 1 1 1 Built-in adapter model
12 100115-00 Power Case Assy
12 100115-00-B Power Case Assy (Black)
13 500313-00 Mecha Chassis 1 1 1
14 500314-00 Lock Lever 1 1 1
15 700021-00 Head SP SEC-3698 2 2 2
16 700025-00 Lock Lever SP 1 1 1
20 100116-00 Platen Holder Assy (1) (1) (1)
21 800452-00 Platen 1 1 1
22 650001-00 Platen Bushing 2 2 2
23 600372-00 Platen Holder 1 1 1
24 600376-00 Platen Gear 1 1 1
25 F60440-00 E-RING, 4 3 3 3
26 F14520-04 Screw, PHT (BT), M2 ×4111
27 ACS-531 ACS-531 (Including fixed blade) 1 1 1
28 000010-00 Stepping Motor SP-42RD-020S 1 1 1
29 100117-00 Thermal Head Assy (1) (1) (1)
30 25-0347 Head Cable (FFC) SEC-2310 1 1 1
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CT-S300 Service Manual
Ref.
No. Parts No. Description RPU Remarks
31 200041-00 PE PCB Assy SEC-3784 (1) (1) (1)
32 500322-00 PE PCB Holder 1 1 1
33 90-0197 PNE PCB Assy SEC-2856 (1) (1) (1) 1 PNE sensor
200055-00 2 PNE sensors
(25-0379) (PNE Cable Assy) SEC-2854 1 1 1
34 600374-00 PNE Lever 1 1 1 1 PNE sensor
600408-00 2 PNE sensors
35 600375-00 PNE Cap 1 1 1 1 PNE sensor
600409-00 2 PNE sensors
36 200036-00 Switch Assy (1) (1) (1)
(Leaf Switch MLS-29Au) 1 1 1
(200035-00) (SW Cable Assy) SEC- 1 1 1
(200040-00) (BM PCB Assy) (1) (1) (1) Black mark option
(200039-00) (BM Cable Assy) 1 1 1 Black mark option
37 32AD AC Adapter 32AD 1 1 1
38 25-0370 AC Cord 100V SEC-2706 1 1 1
39 Plug converter MPR-25B (Black) 1 1 1
38 25-0102 AC Cord 120V SEC-1003
38 25-0103 AC Cord 230V SEC-1004
50 F13630-06 Screw, PHT (ST), M3 ×6 with washer 1 1 1
51 F10230-06 Screw, PHT (ST), M3 ×6101010
52 F11130-08 Screw, PHT (BT), M3 ×8333
53 F11230-10 Screw, PHT (BT), M3 ×10 2 2 2
54 F13417-06 Screw, No0PHT (BT#1), M1.7 ×7111
55 F10430-08 Screw, PHT (ST), M3 ×8222
56 600380-00 Partition 1 1 1 Standard accessory
60-1 950031-00 Control PCB Assy JPN (1) (1) (1) For 100V model
1 PNE sensor
950031-10 2 PNE sensors
60-1 950032-00 Control PCB Assy USA/EUR (1) (1) (1) For 120/230V model
1 PNE sensor
950032-10 2 PNE sensors
61-1 950033-00 IF PCB Assy (Serial) mm (1) Metric screw
61-2 950034-00 IF PCB Assy (Serial) inch (1) Inch screw
61-3 950035-00 IF PCB Assy (Parallel) (1)
61-4 950036-00 IF PCB Assy (USB) (1)
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CT-S300 Service Manual
5.2 Exploded View of Mechanism
•Exploded View-1

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•Exploded View-2

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CT-S300 Service Manual
Ref.
No. Parts No. Description JP EU US Remarks
IC1 H130005-10 CPU uPD703130 FP 100 Pin 1 1 1
IC2 H120005-00 Flash Memory F-Memory 8 Mbit 55 ns 48 PIN TSOP 111
IC101 H120005-00 Kanji ROM F -Memory 8 Mbit 55 ns 48 PIN TSOP 1
IC3 H120011-00 RAM DRAM 4M 60 ns 44 Pin SOP 1 1 1
IC4 H170002-10 DC/DC SI-8401L 1 1 1
IC5 H170004-10 REGULATOR TAR5S33 1 1 1
IC6 H150001-10 RESET IC M51953BFP 8 Pin 1 1 1
IC7 H110015-00 HC-MOS HCMOS, 74VHC273, 20 PIN, TSSOP 111
IC8 H110017-00 HC-MOS HCMOS, 74LV32A, 14P IN, TSSOP 111
IC9 H110016-00 HC-MOS HCMOS, 74VHC05, 14 PIN, TSSOP 111
IC10 H110018-00 HC-MOS HCMOS, 74LV245A, 20 PIN, TSSOP 111
IC11 H110019-00 HC-MOS HCMOS, TC7SH08FU, 5 PIN, TSSOP 111
TA1 H240009-10 Transistor Array SMA7029MU 1 1 1
TA2 H240005-10 Transistor Array TA8428K 1 1 1
S1 H650008-10 Switch SF-W1P1A-01BB2 1 1 1
S2 H650012-10 Switch SKHHBV 1 1 1
F1 H620006-10 Fuse MRT4 1 1 1
F2 H620010-10 Fuse C2Q2 1 1 1
F3 H620008-10 Fuse C2Q500 1 1 1
F4 H620009-10 Fuse C2Q250 1 1 1
X1 H630007-10 X'tal CSTCR6M40G53-R0 1 1 1
CN1 H500013-10 Connector TCS7960-53-2010 1 1 1
CN2 H500015-10 Connector 53014-0310 1 1 1
CN3 H500006-10 Connector 5267-04A 1 1 1
CN4 H500042-10 Connector B6B-PH-K-S 1 1 1
CN5 H500043-10 Connector 6216-28 000 806 1 1 1
CN6 H500014-10 Connector 53014-0210 1 1 1
CN7 H500022-10 Connector DHB-PA30-R131N 1 1 1
BZ1 H680001-10 BUZZER MEB-12C-5 1 1 1
5.3 Parts List for PCB Control Assy
Q’ty