Citizen CT-S310II User manual

Service Manual
COMPACT LINE THERMAL PRINTER
CT-S310II
Revision 1.00 2011.4.25

CT-S310II Series Service Manual
REVISIONS
Rev No. Date Page Comment
1.00 2011/4/25 Newly issued

CITIZEN is a registered trademark of CITIZEN HOLDINGS CO., LTD., Japan.
CITIZEN es una marca registrada de Citizen Holdings Co., Japón.
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CT-S310II Series Service Manual
CONTENTS
INTRODUCTION .............................................................................................4
1. DISASSEMBLY AND REASSEMBLY.......................................................4
1-1. Tools Used .........................................................................................................................4
1-2. Disassembly Procedure .....................................................................................................5
1-2-1. Disassembling the Printer....................................................................................5
1-2-2. Disassembling “UNIT, MECHANISM” ................................................................15
1-3. Assembly Procedure........................................................................................................22
1-4. Oiling................................................................................................................................23
2. TROUBLESHOOTING ...........................................................................25
2-1. Error Details and LED Indications ....................................................................................25
2-2. Troubleshooting Procedure..............................................................................................31
2-3. Troubleshooting Guide.....................................................................................................31
3. SERVICE PARTS LIST ..........................................................................34
3-1. Mechanical Parts List.......................................................................................................34
3-1-1. Mechanical Exploded Diagrams ........................................................................39
3-2. Parts Layout.....................................................................................................................43
3-2-1. SA, MAIN PCB 30..............................................................................................43
4. CIRCUIT DIAGRAMS.............................................................................44
4-1. MAIN PCB .......................................................................................................................44
4-1-1. Main Control Board (CPU1)...............................................................................44
4-1-2. Main Control Board (CPU2/DAC) ......................................................................45
4-1-3. Main Control Board (ROM) ................................................................................46
4-1-4. Main Control Board (RAM) ................................................................................47
4-1-5. Main Control Board (HEAD, OP-PANEL)...........................................................48
4-1-6. Main Control Board (PF MOTOR, CUTTER, DRAWER) ...................................49
4-1-7. Main Control Board (SENSOR, BUZZER) .........................................................50
4-1-8. Main Control Board (POWER)...........................................................................51
4-1-9. Main Control Board (RS232C I/F, USB I/F)........................................................52
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CT-S310II Series Service Manual
5. SUPPLEMENTARY INFORMATION ......................................................53
5-1. Self-printing......................................................................................................................53
5-2. Hex-dump Mode ..............................................................................................................55
5-3. Memory Switch Setting Mode ..........................................................................................56
5-4. Updating the Firmware.....................................................................................................58
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CT-S310II Series Service Manual
INTRODUCTION
This manual describes the disassembly, reassembly, and maintenance procedures of CT-S310II
Series.
1. DISASSEMBL Y AND REASSEMBLY
Note the following items when performing maintenance of the printer.
Do not disassemble, reassemble, or adjust the printer unnecessarily when the printer operation is
satisfactory.
Do not loosen the screws that fasten the components unless it is absolutely necessary.
After finishing inspection, perform a check to ensure that there is no irregularity before turning on the
printer.
Use caution not to leave any part or screw used for maintenance inside the printer.
When handling the print head and electronic components, care must be taken to avoid static electricity.
When disassembling or reassembling the printer, check the wires and cords for damage. Do not draw
any wire or cord by force.
Lubricate the components as necessary when reassembling them.
1-1. T ools Used
Phillips screwdriver #0, #1, and #2
Tweezers (metallic not allowed)
Long-nose pliers
Brush
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CT-S310II Series Service Manual
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1-2. Disassembly Procedure
1-2-1. Disassembling the Printer
1. Disassembling “COVER, FRONT-03”
Put your fingers into the indentation on the front and raise “COVER, FRONT-03” to remove it.
<Precaution at disassembly / reassembly>
When mounting or removing “COVER, FRONT-03”, be
careful not to touch the manual cutter.
If it cannot be removed easily, open “COVER, TOP-03”
beforehand.
2. Disassembling “COVER, TOP-03”
Pull “LEVER, COVER OPEN-03” to open “COVER, TOP-03”.
“COVER, TOP-03” is inserted in slots on the right and left of “CASE-03”.
Pull the right and left panels of “COVER, TOP-03” outwardly while raising “COVER, TOP-03”.
COVER, FRONT-03
Remove the cover being careful not to touch the
manual cutter blade.
LEVER, COVER OPEN-03
COVER, TOP-03

CT-S310II Series Service Manual
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Remove two “SCREW, BHT (PT), M3.0 10” and remove “HOLDER, PLATEN-03” from “COVER,
TOP-03”.
<Precaution at reassembly>
When reassembling “HOLDER, PLATEN-03”, align the holes on “HOLDER, PLATEN-03” with the bosses at
the right and left of “COVER, TOP-03”.
3. Disassembling “HOLDER, PLATEN-03”
Remove two “SCREW, PHT (ST, SW + PW) M3.0 6” that fasten “UNIT, SLIDE BLADE” and remove
“GUIDE 3, PAPER” from “HOLDER, PLATEN-03”.
<Precaution at reassembly>
When reassembling, align “GUIDE 3, PAPER” with bosses at “HOLDER, PLATEN”.
Keep the chamfered side of “UNIT, SLIDE BLADE” at the left so that the mark at “HOLDER, PLATEN” can be
seen.
HOLDER, PLATEN-03
SCREW, BHT (PT), M3.0 10
Bosses
HOLDER, PLATEN-03
SCREW, PHT (ST, SW + PW), M3.0 6
GUIDE 3, PAPER
Bosses

CT-S310II Series Service Manual
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Remove “E-RING, 4” from the right side of “SA, PLATEN-03”.
Move “BUSHING, PLATEN” on the right side of the shaft of “SA, PLATEN-03” inwardly, then move “SA,
PLATEN-03” to the right. (Together with “BUSHING, PLATEN” on the left)
Raise the gear side of “SA, PLATEN-03” and pull it out toward the left.
Pull “WASHER, PLATEN” outwardly while pulling out “GEAR, PLATEN”.
E-RING, 4
(1) (2)
WASHER, PLATEN GEAR, PLATEN

CT-S310II Series Service Manual
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4. Disassembling “CASE-03”
Pull the right and left panels of “CASE-03” at the bottom center outwardly.
(Be sure to disengage the lugs at the front and rear from “FRAME, BOTTOM-03”.)
When raising “CASE-03”, pull the left panel of “CASE-03” outwardly to avoid contacting “LEVER L,
CUTTER RELEASE” on the left side, and pull the right panel outwardly to avoid contacting “LEVER,
COVER OPEN-03” on the right side.
Remove “SCREW, BHT (BT) M3.0 8” that fastens “LEVER, FEED SW-03”.
<Precaution at reassembly>
Align holes on “LEVER, FEED
SW-03” with bosses on
“CASE-03”.
Remove “CASE-03” while
keeping the lugs clear of
“FRAME, BOTTOM-03”.
Fastening lugs
CASE-03
SCREW, BHT (BT), M3.0 8
LEVER, FEED SW-03

CT-S310II Series Service Manual
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5. Disassembling “FRAME, BOTTOM-03”
Remove two “SCREW, BHT (ST), M3.0 6” that fasten “FRAME, BOTTOM-03” and “FRAME, MAIN-03”.
Disconnect connectors from “SA, MAIN PCB”.
J2: HEAD
J3: MOTOR
J7: AUTO CUTTER
J8: COVER OPEN SENSOR (TOP COVER)
J9: COVER OPEN SENSOR (FRONT)
J10: PAPER SENSOR
<Precaution at disassembly / reassembly>
Do not pull the cable by force.
When reassembling, be careful not to catch the
cable.
“FRAME, BOTTOM-03” and “FRAME, MAIN-03” are secured with hooks at the bottom. Slide “FRAME,
BOTTOM-03” to disengage it from “FRAME, MAIN-03”.
<Precaution at reassembly>
Check that hooks on the right and left are securely inserted.
When securing “FRAME, BOTTOM-03” with screws, align the boss at “FRAME, BOTTOM-03” with the hole at
“FRAME, MAIN-03”.
SCREW, BHT (ST), M3.0 6
J3 J9 J8 J10 J7
J2
“FRAME, BOTTOM-03” side “FRAME, MAIN-03” side
Hooks
Boss

CT-S310II Series Service Manual
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Disconnect the power connector (J11) from “SA, MAIN PCB”.
Push the rear of “FRAME, BOTTOM-03” outwardly and raise “FRAME, MIDDLE-03”.
Before removing “FRAME, MIDDLE-03”, remove the power cable from the notch. When mounting it,
align the hole on the front of “FRAME, MIDDLE-03” with the boss.
<Precaution at reassembly>
Insert lugs at “FRAME, MIDDLE-03” into slots at “FRAME BOTTOM” as shown below.
J11
FRAME, MIDDLE-03
Power cable

CT-S310II Series Service Manual
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Remove “SCREW, BHT (ST), M3.0 6” that fastens “FRAME, BOTTOM-03” and “PLATE, IF-03”.
Remove two “LOCK SCREW” from the right and left of the serial connector.
Turn “PLATE, IF-03” toward you and pull it out upwardly.
Remove three “SCREW, TP (ST), M3.0 5” that fasten “SA, MAIN PCB”.
Note that one of those screws is secured with “COVER, DR CONNECTOR-03”.
<Precaution at reassembly>
When attaching “PLATE, IF-03”, align the bosses at “FRAME,
BOTTOM-03” with the holes at “PLATE, IF-03”.
Check the positions of the serial, DK and USB connectors.
Remove two “SCREW, FHT (ST), M3.0 8” that fasten “FRAME, BOTTOM-03” and the AC inlet on
“PWB (MAIN_PCB30)”. Move the AC inlet outwardly to detach it from “FRAME, BOTTOM-03”.
SCREW, BHT (ST), M3.0 6
BOSS
DK LOCK SCREW USB
PLATE, IF-03 COVER, DR
CONNECTOR-03
SCREW, TP (ST), M3.0 5
SCREW, FHT (ST), M3.0 8
AC inlet

CT-S310II Series Service Manual
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Remove “SCREW, PH (SW), M4.0 6” from “FRAME, BOTTOM-03” and disconnect the frame ground
cable. Remove three “SCREW, TP (ST), M3.0 5” that fasten “FRAME, BOTTOM-03” and “PWB
(MAIN_PCB30)”.
<Precaution at disassembly / reassembly>
When assembling or disassembling “PWB (MAIN_PCB30)”, be sure
to avoid contacting any part of “FRAME, BOTTOM-03” (especially
capacitors).
Be careful not to deform the power switch when inserting it into the
notch at “FRAME, BOTTOM-03”.
6. Disassembling “SA, CUTTER UNIT”
Pull “LEVER R & L, CUTTER RELEASE” toward you to raise “SA, CUTTER UNIT” and remove “SA,
CUTTER UNIT” from “FRAME, MAIN-03”. Remove the cable from the connector.
<Precaution at disassembly /
reassembly>
When disconnecting the connector,
do not pull the cable by force.
When reassembling, hang the cable
to the hook. Be careful not to catch
the cable.
SCREW, PH (SW), M4.0 6
Frame ground cable
PWB (MAIN_PCB30)
SCREW, TP (ST), M3.0 5
POWER SW
Insert the power switch into the notch
at "FRAME, BOTTOM-03".
Be sure to avoid contacting the
capacitors.
SA, CUTTER UNIT
Connector
Hooks
LEVER L, CUTTER RELEASE
CABLE

CT-S310II Series Service Manual
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7. Disassembling “SA, THERMAL HEAD-03”
Hold the right and left side of “HOLDER, HEAD SPRING” and push it toward the “HEAD” side to
disengage the hooks on the right and left, and pull it out upwardly.
<Precaution at reassembly>
Align three “SPRING, HEAD-03” with the lugs at “SLIDE, HEAD SPRING-03”.
Align “SA, HEAD” with bosses on the right and left of “FRAME, MAIN-03” as well as the U-slots at “HOLDER,
HEAD SPRING”.
Insert the hook at “FRAME MAIN” until its end reaches the mark at “HOLDER, HEAD SPRING”.
Detach “SA, THERMAL HEAD-03” from the bosses on the right and left of “FRAME, MAIN-03”.
<Precaution at reassembly>
Align the slots at “SA, THERMAL HEAD-03” with the bosses on the right and left of “FRAME, MAIN-03”.
HOLDER, HEAD SPRING Hooks
Insert "SPRING, HEAD-03"
into the grooves,
respectively.
Bosses
Insert the hook until its end reaches the
mark at "HOLDER, HEAD SPRING".
SA, THERMAL HEAD-03 Align the boss with
the U-slot.

CT-S310II Series Service Manual
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Remove “SLIDE, HEAD SPRING-03” and “CABLE, HEAD FFC” from “SA, THERMAL HEAD-03”.
<Precaution at reassembly>
Check the mounting position of “SLIDE, HEAD SPRING-03”.
Connect “CABLE, HEAD FFC” with the conducting face facing upward.
Since the connector pins are sharply pointed, never touch the connector terminal.
Remove “SCREW, BH, M3.0 4” that fasten “SA, THERMAL HEAD-03” and “HOLDER, HEATSINK-03”.
<Precaution at reassembly>
Align the bosses at “HOLDER, HEATSINK-03” with the holes at “SA, THERMAL HEAD-03”.
SLIDE, HEAD SPRING-03
CABLE,
HEAD FFC Conducting face
Check the positions.
Be careful not to touch the
connector terminal.
SCREW, BHT (ST), M3.0 6
Hole for boss

CT-S310II Series Service Manual
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1-2-2. Disassembling “UNIT, MECHANISM”
1. Disassembling “LEVER, INTERLOCK SENSOR-03”
Detach “SPRING, LEVER INTERLOCK” from the hook at “FRAME, MAIN-03”.
Remove “SHAFT, LEVER” that secures “FRAME, MAIN-03” and “LEVER, INTERLOCK SENSOR”.
2. Disassembling “HOLDER, PAPER-03”
Contract “SPRING, POP UP-03” and remove it toward you.
Move down “POP UP, COVER”, align the lugs on the right and left with the notches at “FRAME,
MAIN-03”, and pull it out toward you.
Remove one “SCREW, BHT (BT), M3.0 6” that fastens “FRAME, MAIN-03” and “HOLDER,
PAPER-03” from the right and left sides. Remove one “SCREW, BHT (ST), M3.0 6” that fastens
“BASE, HEAD” from the right and left sides.
SHAFT, LEVER
SPRING, LEVER INTERLOCK
SPRING, POP UP-03
Align the lugs with the notches
and pull out "POP UP, COVER".
POP UP, COVER
SCREW, BHT (BT), M3.0 6
SCREW, BHT (ST), M3.0 6

CT-S310II Series Service Manual
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Remove two “SCREW, NO. 0, THF (BT4-0.5) M2.0 4” that fasten “HOLDER, PAPER-03” and “SA, PE
SENSOR”. Pull the right and left frames at “FRAME, MAIN-03” outwardly and pull “HOLDER,
PAPER-03” upwardly until it is removed.
<Precaution at reassembly>
Align two bosses on the right and left sides of “HOLDER, PAPER-03” with holes at “FRAME, MAIN-03”.
Each slit must be aligned as well.
3. Disassembling “SA, MOTOR-03”
Remove “SCREW, BHT (ST), M3.0 6” and “SCREW, PHT (ST), M3.0 6” that fasten “FRAME,
MAIN-03” and “COVER, GEAR-03”.
<Precaution at disassembly / reassembly>
When reassembling, do not tighten the screws
excessively. Doing so may damage “COVER,
GEAR-03”. Be careful not to confuse two
different screw types.
SCREW, NO.0, THF (BT4-0.5) M2.0 4
Pull the right and left frames
outwardly while pulling it upwardly.
Hole for boss
Left frame Slit
Hole for boss
Right frame
SCREW, PHT (ST), M3.0 6
SCREW, BHT (ST), M3.0 6
COVER, GEAR-03

CT-S310II Series Service Manual
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Remove “GEAR, REDUCTION” from
“COVER, GEAR-03”.
Remove “SCREW, PHT (ST), M3.0 6” that
fastens “FRAME, MAIN-03” and “SA,MOTOR-03”.
<Precaution at reassembly>
When assembling “SA, MOTOR-03”, keep the terminal
section facing downward.
4. Disassembling “PLATE, PLATEN LOCK LEVER”
Remove “SPRING, LEVER PLATEN LOCK” from the hooks at “FRAME, MAIN-03” and “LEVER R,
PLATEN LOCK”.
Remove two “SCREW, PHT (ST), M3.0 6” that fasten “PLATE, PLATEN LOCK LEVER” with “LEVER
R, PLATEN LOCK” and “LEVER L, PLATEN LOCK”, respectively.
GEAR, REDUCTION
COVER, GEAR-03
SCREW, PHT (ST), M3.0 6
UNIT, MOTOR
SPRING, LEVER PLATEN LOCK
LEVER R, PLATEN LOCK LEVER L, PLATEN LOCK
SCREW, PHT (ST), M3.0 6

CT-S310II Series Service Manual
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Remove one “SCREW, BHT (ST), M3.0 6” that fastens “LEVER R, PLATEN LOCK” and “LEVER,
COVER OPEN-03”.
<Precaution at reassembly>
When reassembling, align the boss at “LEVER, COVER OPEN” with the hole at “LEVER R, PLATEN LOCK”.
Raise the rotating shaft a little while moving down “LEVER R, PLATEN LOCK” and align it with the slot
at “FRAME, MAIN-03” and remove the shaft through the shaft hole.
<Precaution at disassembly / reassembly>
To keep the hook at “LEVER R, PLATEN LOCK”
clear of “FRAME, MAIN”, raise the rotating shaft
slightly when removing it.
When reassembling, align the slot position with the
shaft hole and return the lever in place.
Pull “PLATE, PLATEN LOCK LEVER” out.
<Precaution at disassembly / reassembly>
When reassembling, check the orientation.
LEVER, COVER OPEN
Hole for boss
SCREW, BHT (ST), M3.0 6
Holes
Slot
Shaft
LEVER R, PLATEN LOCK
PLATE, PLATEN LOCK LEVER