This is the COMPLETE factory Service Repair Manual for the OKI Microline 3390/3391 printer. This Service Manual has easy-to-read text sections with top quality diagrams and instructions as well as step-by-step instructions for repairing your OKI machine. it makes it easy for you to learn technical theory, installation, maintenance, troubleshooting, disassembly, assembly and repair of OKI products.

Models Covered:
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OKI Microline 3390 printer
OKI Microline 3391 printer

This Manual Covers:
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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
3.3.9 Carriage Cable
3.3.10 Backup Roller Holder Assy
3.3.11 Platen Assy
3.3.12 Driver Board (SRXD)
3.3.13 LF Motor
3.3.14 Operation Panel PCB (LEOP)
3.3.15 Control/Power Supply Board (SRXC)
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)

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Model Specification: OKI Microline 3390/3391 printer
Total Pages: 148
File Format: PDF
Requirements: Adobe PDF Reader
Language: English
Compatible: All Versions of Windows & Mac, APP ISO, Iphone, Ipad, Android etc...

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This manual is in PDF format, The Service Manual PDF is Fully Indexed and Bookmarked by Topic. This is an original Adobe document which equals Perfect Quality and Perfect Printing. The PDF can be searched quickly to find what you need to know in every Chapter. You can print the Entire manual or ANY Pages you want to select. You can also Zoom in on any Diagram or Picture to easily SEE EVERY PART.

Save time and money by doing your own repairs! This manual makes any repair job easy to do with very easy to follow step-by-step instructions & pictures on all areas of repair.

ALL Service Repair Manual are INSTANT DOWNLOAD, it means no shipping cost or waiting for a CD or paper manual to arrive in the mail. you will receive this manual today via instant download on completion of payment via our secure payment processor. We accept all major credit/debit cards and paypal.

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