Citizen iDP-3221 Series User manual

CITIZEN
Service Manual
Model: iDP3221
Line Thermal Printer
Rev. 1.00 Newly issued on May 10, 1999
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iDP-3221 Service Manual
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INTRODUCTION
This manual describes the disassembly, reassembly, and maintenance procedures of the line
thermal printer iDP3221. It is intended for field maintenance men.
FEATURES
This is a small line thermal printer developed to be used for various data communication termi-
nals, POS terminals, kitchen printer, and so on. With its abundant features, it can be widely
used for various types of applications. Prior to using the printer, read this manual thoroughly to
understand its contents.
1. Small, lightweight, with a small footprint.
2. Designed with a reduced number of components to ensure low cost.
3. Paper is added by simply placing the paper and closing the cover.
4. A removable platen mechanism simplifies maintenance (e.g. paper handling and head
cleaning).
5. Line thermal printing for high speed and low noise.
6. A long-life head with a simple mechanism to ensure high reliability.
7. Built-in input buffer.
8. Bar code printing (with special commands).
9. Built-in drawer kick-out interface.
10. Auto cutter fitted as standard.
11. User registration of external characters.

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1. HANDLING AND MAINTENANCE OF PRINTER ..........................................................................5
2. SPECIFICATIONS ...............................................................................................................................6
2.1 Basic Specifications ....................................................................................................................6
3. MECHANISMS AND OPERATING PRINCIPLES ..........................................................................7
3.1 Power Transmission and Paper Feed Mechanism....................................................................7
3.2 Platen Roller Attaching/Detaching Mechanism .......................................................................8
3.3 Sensor Mechanism......................................................................................................................8
3.3.1 Paper Sensor...................................................................................................................8
3.3.2 Paper Near-end Sensor..................................................................................................9
3.4 Print Head Mechanism...............................................................................................................9
3.4.1 Drive Control Overview .................................................................................................9
3.4.2 Print Data and Print Positions....................................................................................10
4. DISASSEMBLY AND REASSEMBLY ..............................................................................................11
4.1 Disassembly Procedure.............................................................................................................11
4.2 Reassembly Procedure..............................................................................................................18
5. TROUBLESHOOTING ......................................................................................................................19
5.1 Troubleshooting Procedure..………………………………………………………………..………19
5.2 Troubleshooting Guide.. ..…………………………………………………………………….……..19
6. SERVICE PARTS LIST......................................................................................................................23
6.1 Parts List for Mechanism.........................................................................................................23
6.2 Disassembly Drawing...............................................................................................................25
6.3 Parts List for Control PCBAssy .............................................................................................27
6.4 Parts Layout Drawing..............................................................................................................30
6.4.1 Control PCB Assy 3221-01 (Serial Interface D-sub 25).............................................30
6.4.2 Control PCB Assy 3221-02 (Parallel Interface)..........................................................32
7. DRAWING...........................................................................................................................................34
7.1 Block Diagram..........................................................................................................................35
7.2 Circuit Diagram........................................................................................................................36

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7.2.1 Control PCB Assy 3221-01 (Serial Interface D-sub 25).............................................36
7.2.2 Control PCB Assy 3221-02 (Parallel Interface)..........................................................37
8. OUTER DIMENSION ........................................................................................................................38
¨For the auto cutter unit (ACS-231), see the separate Service Manual.

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

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Model
Item iDP3221–RF120
iDP3221–PF120 iDP3221–RF230 iDP3221–PF230
Printing system Line thermal dot printing
Printing width 72.192 mm/512 dots
Dot density Width: 0.141 mm, Length: 180 DPI (0.141 mm)
Printing speed 63.45 mm/sec.
(At maximum speed, print density level 2), (450-dot line/sec.)
Printing columns 42 columns (Font A) , 56 columns (Font B)
Printing size 1.41´3.39 mm (Font A) , 0.99´3.39 mm (Font B)
Line pitch 4.23 mm (1/6 inch)
Can be set with a command (See 10.2 "Command Details.")
Character types Alphanumeric, international characters, extended graphic
Bar code type UPC-A/E, JAN(EAN) 13-/18-column, ITF, CODE 39, CODE 128,
CODABAR, CODE 93
Paper Thermal paper roll : 80 + 0/- 1 mm´f83 (max.) mm
(See Paper Specifications)
Interface Serial (RS-232C)
Parallel (IEEE 1284 compliant) (Bi-directional communication)
Input buffer 4 KB or 72 bytes (Selectable with the DIP switch)
Supply DC voltage 24 V DC +/- 7%
Power consumption 100 W
AC adapter Rated input : 100~240 VAC, 50/60 Hz, 120 VA
Rated output : 24 V DC, 1.8A
Type 31AD-U 31AD-E
Weight Main body: Approx. 1.3 Kg
AC adapter:Approx. 450 g
Outer dimensions 152 (W) ´201 (D) ´123 (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:
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)
Auto cutter life:
500,000 cuts (With recommended thermal paper at normal tempera-
ture and humidity)
Applicable standard *1 UL, C-UL, FCC Class-A TUV, GS, CE Marking
Note: *1 indicates the standard satisfied when theAC adapter (31AD series) is used.

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The following describes the basic mechanisms of the printer and how the printer operates, for the
following blocks.
• Power transmission and paper feed mechanism
• Platen roller attaching/detaching mechanism
• Sensor mechanism
• Print head mechanism
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As the motor runs, its force is conveyed via the motor gear (mounted on the motor shaft) to the
platen gear, which rotates the platen roller. At its ends, the platen roller is pressed by the head
springs against the thermal elements on the thermal head.
When thermal paper is inserted between the platen roller and the thermal head, the rotation of
the platen roller feeds the paper, which is delivered to the paper outlet.
Motor
Platen Roller
Platen Gear
Motor Gear
Thermal Head
Paper
Platen Roller
Thermal Elements
Thermal Elements
Thermal Head

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The platen roller in the paper feed mechanism is removable from the printer. The platen roller
is built as a unit consisting of the platen gear, platen bushes, and platen lever L and R. When
this unit is set on the U-shaped brackets of the chassis, the platen gear engages with the motor
gear. The platen is brought into contact with the thermal head, as it is pressed by the head
springs which each have one end anchored to the hook of the chassis.
The movable end of each head spring can be released from the hook on the chassis to remove the
platen roller.
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The paper sensor detects the presence of paper just
before the thermal head. Only when this sensor
detects paper, does the thermal head is energized,
because otherwise the thermal head may be damaged
or its life seriously affected. The sensor also works
in automatic paper loading to determine whether
paper is inserted or not. (The paper sensor is built
on the thermal head.)
Platen Bush
Platen Roller
Platen Roller (Platen Roller Unit)
U-Shaped Bracket
Hook
Platen Lever L
Platen Lever R
Platen Gear
Head Spring
Motor Gear
Thermal Head
Platen Roller
Paper
Paper Sensor

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This sensor detects that the paper is nearing the roll end. When the remaining quantity of pa-
per becomes small (about 50 to 200 cm for the designated paper), the sensor detects it because
the roll surface comes off the sensor. The remaining quantity of paper depends on the quality
of the paper or the material of the core. It is not possible to adjust the near-end point.
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The print head in this printer is a thermal head. It consists of thermal elements and a head
driver. The thermal elements are driven and controlled by the head driver.
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The serial print data coming from DATA
IN (DI) is synchronized with a CLOCK
(CP) signal and transferred to the shift
register. The data is stored into the latch
register by a LATCH (LA) signal. When
gates are turned on by head ON signals
(print commands STR1 - 3), the thermal
elements corresponding to the stored print
data are energized, and the resultant heat
works to print on the thermal paper.
Paper Near-end Sensor Platen Roller
Thermal HeadFeed Rollers
Paper
Latch Register
Shift Register
Thermistor
[Equivalent circuit for thermal head]
Thermal
Elements
Gates

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The 512-bit print data (numbers 1 - 512) transferred from DATA IN (DI) is printed at the posi-
tions shown in the figure below.
Paper Feed Direction
Paper
Paper Feed Direction
Print Surface Data
Print Surface

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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.
(4) Check that the printing paper and platen roller are properly set.
(5) During maintenance, be careful not to leave parts or screws unattached or loose inside the
printer.
(6) When handling the thermal head, do not use gloves or other aids which can easily cause
static electricity.
(7) 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. Removing the Printer Cover
(1) Open the printer cover.
(2) Push the hinge part of either side of the printer cover inward and remove the hinge from
the main body.
(3) Remove the another hinge and
detach the printer cover. Printer Cover
Hinge

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2. Removing the Upper Cover
(1) Remove the head springs from the hooks and detach the platen roller.
(2) Remove the two screws (M3´8).
(3) Lift the back of the upper cover to open it. With this condition, insert a flat-blade
screwdriver into the slit at the front of the printer (between the chassis and upper cover
¬and -) to unlock the claws.
(4) Lift the upper cover gently and disconnect the connectors of sensors (such as paper
near-end sensor when paper of 58 mm width is used) from the control board.
(5) Remove the upper cover by lifting it upward while paying attention so as not it is dis-
turbed by the head springs.
Head Spring
Platen Roller
Connector

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3. Removing the Black Mark Sensor (Option) from the Upper Cover
(1) Remove the upper cover.
(2) Push the claw on the bottom of the upper cover to bent it and remove the one end of the
PC board.
(3) Unhook the cable of the PC board from the upper cover.
(4) Gently disengage the PC board from the two projections of the upper cover to remove it.
In this case, pay special attention so as not to break the projections.
4. Removing the Rollers from the Upper Cover
(1) Push either side of the roller shaft holding part outward to bend it as shown in the figure
and remove the roller.
Black Mark SensorUpper Cover (Bottom View) Projection
Claw
Projection
Roller Shaft Holding Part Roller Shaft Holding Part

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5. Disassembling the Platen Roller Unit
(1) Disengage the E-ring on the platen gear side.
(2) Remove the platen gear, platen bush, platen lever R, and E-ring in that order.
(When assembling, align the notch of the platen bush with the projection of the platen
lever R.)
(3) Disengage the other side of the E-ring and then remove the platen bush, platen lever L,
and E-ring.
6. Removing the Pressure Roller
(1) Remove the printer cover.
(2) Remove the two screws (M2.6´6) to detach the pressure roller block from the printer
cover.
(3) Bend the roller spring and
remove it from the roller
holder.
(4) Bend the bearing part of
the roller holder and remove
the pressure roller.
Platen Gear
Platen Lever R
D-Cut
Platen Lever L
Platen Bush
E-Ring
Platen Roller
E-Ring
Platen Bush
Printer Cover
Roller Spring
Roller Holder
Roller

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7. Removing the bottom plate from the chassis
(1) Remove the two screws (M3´8).
(2) Slide the bottom plate in the direction ¬a little to remove it from the power connector
housing.
(3) Lift the bottom plate while turning it in the direction -. Then, the bottom plate comes
off the chassis.
8. Removing the Auto CutterACS-231 from the Chassis
(1) Remove the bottom plate.
(2) Remove the upper cover.
(3) Disconnect the connector of the auto cutter from the control board.
(4) Remove the two screws
(M2.6´6) and detach
the auto cutter by
lifting it upward.
Bottom Plate
Connecting Sections
Auto Cutter ACS-231

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9. Removing the Control Board from the Chassis
(1) Remove the bottom plate.
(2) Remove the upper cover.
(If the optional black mark sensor or paper holder is not installed, remove only the
platen roller as it is unnecessary to remove the upper cover.)
(3) Remove the two screws (M3´16) and two screws (M3´8).
(4) Remove the control board by lifting it upward. In this case, do not deform the thermal
head, paper near-end sensor, power switch, etc. or make scratch on them.
Control Board

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10. Removing the Thermal Head from the Control Board
(1) Insert a flat-blade screwdriver between the heat sink of the thermal head and head BK
(insert it into the place shown by the arrow) and, with weak force, lift the thermal head
from the connector until it floats from the connector a little.
(2) Lift the other end in the same way.
(3) Without touching the thermal elements, remove the thermal head from the connector
by lifting it upward.
Note: By performing above steps (1) to (3) after removing the upper cover, it is possible to
remove the thermal head without detaching the control board.
11. Removing the Motor from the Chassis
(1) Remove the upper cover.
(2) Remove the control board.
(3) Remove the motor cable
form the chassis and
detach the motor by
removing the two screws
(M3´5).
Motor
Thermal Head
Heat Sink

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12. Removing the Head Springs from the Chassis
(1) Remove the upper cover.
(2) Turn the head springs to set them upright and then remove them by lowering them.
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Reassemble each part in the reverse order of the disassembly procedure described in Section 4.1.
Head Springs

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When a trouble occurs, confirm its phenomenon, locate a defective part in accordance with 5.2
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 ef-
ficiently with fewer misjudgments.
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Phenomenon Cause Check Method Remedy
The AC adapter is not
connected. Connect the specified AC adapter.
Check whether any un-
specified power has
been used so far.
Use the specified AC
adapter.
No power
(POWER lamp not
illuminated) The fuse is gone.
Check whether the
specified fuse is used. Use the specified fuse.
The control PCB assy is
defective. Replace the control PCB assy.
The fuse immedi-
ately goes again
after replacing with
new one. The circuit drive power
is abnormal. With a DC voltmeter, measure the circuit
drive voltage.
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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Phenomenon Cause Check Method Remedy
Faulty DC output volt-
age from the AC
adapter
Check whether the
specified AC adapter is
used.
Use the specified AC
adapter.
Faulty mounting or
connection of the con-
trol PCB assy
Check mounting and
connection of the con-
trol PCB assy.
Mount the control PCB
assy properly.
Check mounting condi-
tion of the platen roller. Mount the platen roller properly.
Faulty mounting of the
platen roller Check any deformation
or bending of the head
spring.
Replace the deformed
head spring.
No printing
Faulty thermal head
unit Replace the thermal head unit.
Faulty DC output volt-
age from the AC
adapter
Check whether the
specified AC adapter is
used.
Use the specified AC
adapter.
Non-recommended pa-
per is used. Replace it with the specified paper.
Faulty thermal head
unit Replace the thermal head unit.
Low DC output voltage
from the AC adapter Check the DC voltage with a DC voltmeter. Supply the specified AC voltage to the AC
adapter.
Paint printout
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 output volt-
age from the AC
adapter
Check whether the
specified AC adapter is
used.
Use the specified AC
adapter.
Badly blurred
printout
Foreign substance is
attached to the print
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 away the
foreign substance.
Faulty paper Check whether the pa-
per meets the specifica-
tions.
Replace it with the
specified paper.
Bad printing qual-
ity
Low DC output voltage
from the AC adapter Check the DC voltage with a DC voltmeter. Supply the specified AC voltage to the AC
adapter.