Citizen IDP-3221 Series Manuale utente

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

– 2– CITIZEN

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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iDP-3221 Service Manual

– 3– CITIZEN

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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iDP-3221 Service Manual

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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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iDP-3221 Service Manual

– 5– CITIZEN

G A

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

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iDP-3221 Service Manual

– 6– CITIZEN

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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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iDP-3221 Service Manual

– 7– CITIZEN

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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 Head

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iDP-3221 Service Manual

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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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iDP-3221 Service Manual

– 9– CITIZEN

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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

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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iDP-3221 Service Manual

– 10 – CITIZEN

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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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