Oki Microline 3320 User manual

All specifications are subject to change without notice.
MICROLINE 3320/3321
PRINTER
Maintenance Manual
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PREFACE
This maintenance manual describes how to maintain the Microline 3320/3321 printer in the field.
This manual is for customer engineers.
For further information, refer to the Users Manual for handling or operating the equipment.

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TABLE OF CONTENTS
1. CONFIGURATION
1.1 Standard Printer Configuration
1.2 Options
2. THEORY OF OPERATION
2.1 Electrical Operation
2.1.1 Summary
2.1.2 Microprocessor and the Peripheral Circuit
2.1.3 Initialization
2.1.4 Parallel Interface Control
2.1.5 Print Control
2.1.6 SP/LF Motor Control
2.1.7 Operation Panel
2.1.8 Alarm Circuit
2.1.9 Power Supply Circuit
2.2 Mechanical Operation
2.2.1 Printhead Mechanism and Operation
2.2.2 Spacing Operation
2.2.3 Head Gap Adjusting
2.2.4 Ribbon Drive
2.2.5 Paper Feed Operation
2.2.6 Paper Detection Mechanism
2.2.7 Automatic Sheet Feed
2.2.8 Paper Park Function
3. ASSEMBLY/DISASSEMBLY
3.1 Precautions for Parts Replacement
3.2 Service Tools
3.3 Disassembly/Reassembly Procedure
3.3.1 Printhead
3.3.2 Ribbon Protector
3.3.3 Pull-up Roller Assy
3.3.4 Upper Cover Assy, Access Cover Assy and Sheet Guide Assy
3.3.5 Gear Case Assy
3.3.6 PC Connector
3.3.7 Space Motor, Guide Roller Assy
3.3.8 Space Rack

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3.3.9 Carriage Cable
3.3.10 Backup Roller Holder Assy
3.3.11 Platen Assy
3.3.12 Driver Board (SDDV)
3.3.13 LF Motor
3.3.14 Operation Panel PCB (LEOP)
3.3.15 Control/Power Supply Board (SDCT)
3.3.16 Transformer Assy
3.3.17 Change Lever and Gears
3.3.18 Carriage Shaft
3.3.19 Paper Pan
3.3.20 Rear Tractor Assy
3.3.21 Rear Pressure Assy
3.3.22 Switch Lever
4. ADJUSTMENT
5. CLEANING AND LUBRICATION
5.1 Cleaning
5.2 Lubrication
6. TROUBLESHOOTING AND REPAIR
6.1 Items to Check Before Repair
6.2 Troubleshooting Table
6.3 Lamp Display
6.4 Connection Circuit Check for Printhead and SP/LF Motor
6.5 Troubleshooting Flow Chart
APPENDIX
A. PCB LAYOUT
B. SPARE PARTS LIST
C. RS-232C Serial Interface Board (OPTION)

1. CONFIGURATION

1 – 1
1. CONFIGURATION
1.1. Standard Printer Configuration
This printer consists of the following assemblies:
Figure 1-1 Configuration
Sheet guide assy Platen knob
Access cover
assy
Upper cover
Transformer assy Pull-up roller assy
Operation panel assy
Main chassis assy
Driver board
Control/Power supply assy

1 – 2
1.2 Options
(1) Cut sheet feeder unit (CSF)
(Narrow and wide versions available)
Dual-bin CSF Single-bin CSF
Attachment assy
(2) Pull-tractor assy

1 – 3
(3) Bottom push tractor unit
(5) Serial I/F
• RS232C
• RS422A
• Current Loop
(4) Roll paper stand (Narrow only)

2. THEORY OF OPERATION

2 – 1
2. THEORY OF OPERATION
2.1 Electrical Operation
The electrical operation of the printer circuit is described in this section.
2.1.1 Summary
Fig. 2-1 shows the block diagram of the printer.
The control board is made up of the microprocessors, peripheral circuits, drive circuits, sensors
and interface connectors.
The power to the control board is supplied by the power board through the connector cord.
The power to other electrical parts is also distributed through the connectors within the control
board.
2.1.2 Microprocessor and the Peripheral Circuit
(1) Microprocessor (Q7: 67X640)
This processor is a CMOS single-chip computer with integrated peripheral device functions
and a 16 bit MPU core, all OKI original architecture.
The processor has a 20 bit address bus and a 16 bit data bus.
It is capable of accessing up to 1M word program memory and 1M bytes of data memory.
The following characteristics are also provided:
• Built-in type data memory of 512 bytes
• 8-bit 4-channel A/D converter ×1
• 16-bit automatic reload timer ×2
• 8-bit serial port ×2
• 8-bit parallel port ×3 (bitwise I/O specification available)
And others.
The function of this microprocessor is to provide a central mechanism for the entire printer
by executing the control program through the LSI and driver circuits.