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Service Guide ML380
Chapter B Illustrated Parts Listing
B.1 OVERVIEW B.1.01 General Information This appendix will assist you in identifying the assemblies and parts of the product. Use Section Four (Failure Analysis) to determine the defective part(s). Locate the part and its part number in this section. Appendix B is cross-referenced to Section Three (Maintenance). Format The format for this appendix is a series of tables with diagrams. The tables contain the item reference number, the Okidata and Oki-Japan (Oki-J) part numbers, the part description, a comments section, and the disassembly procedure.
Items with the comments RSPL (Recommended Spare Parts List), Consumable, Document, or Option are available from Okidata. Items without these comments are usually not stocked. Some items are only available as assemblies. Every effort has been made to clearly indicate which items are in assemblies and which are not. N/A will appear where a part number is not available Current Part Numbers Okidata has made every effort to include current part numbers in this Service Handbook at the time of publishing. However, technical information frequently changes. These changes often include new or modified parts, with new or modified part numbers. Please refer to the following resources for current part numbers and pricing. Okidata's Electronic Bulletin Board (Okilink II) contains current part numbers, prices, and recommended stocking levels for each item listed as a recommended spare part. For instructions on accessing Okilink II, refer to the Service Center Reference Guide. Okidata's Faxable Facts is an automated fax document retrieval system. Part numbers and pricing are available through Faxable Facts. For instructions on accessing Faxable Facts, refer to the Service Center Reference Guide. Okidata's Technical Information Group is a telephone support line reserved for Authorized Dealers. Part numbers and pricing are available through Technical Information. For instructions on accessing Technical
Information, refer to the Service Center Reference Guide. REMEMBER
Current part numbers, recommended stocking levels, and pricing information are available through Okilink II, Faxable Facts, and Technical Information. Refer to the Service Center Reference Guide for information on accessing these resources.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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B.1.02 Definition of Terms Assemblies Assemblies are parts grouped under a single description and/or part number. Generally, individual items in an assembly are not available from Okidata. Assemblies are surrounded by broken line boxes in the diagrams. Assemblies will say "Includes xx xx" under the Comments section of the tables. Parts in assemblies will say "Part of xx" under the Comments section of the tables. Blank Okidata does not recommend stocking this item. This item should be purchased on an As Required Basis only. The availability of this item is NOT guaranteed by Okidata. Consumable A consumable is a supply item which has a specified life and must be periodically replaced. It is purchased and installed by the end user. Okidata machines are designed to work exclusively with Okidata consumables. By using genuine Okidata consumable products, the investment made in the equipment is protected. Document A document is a printed item which supports the service and marketing of a product. Various documents are available from Okidata. Drivers Printer drivers are updated frequently. Please refer to Okilink II for the latest printer driver information. Firmware Firmware is revised frequently. Please refer to Okilink II for the latest firmware information. Option An option is a part/assembly which is added to a product. The option expands the products functionality. An option may or may not be installed by the end user. Instructions for installation accompany each option. Option RSPL

Okidata recommends that this part/assembly be on hand for servicing installed options. RSPL Okidata recommends that this part/assembly be on hand for servicing. Technical Service Bulletins Technical Service Bulletins (TSBs) are also referred to as Okidata's monthly mail. The TSBs contain the latest information on firmware revisions, procedure changes, and technical information updates. Okidata distributes the TSBs through Okilink II. The TSBs are issued monthly. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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B.1.03 Parts Ordering Information Service Center Reference Guide When a technician has successfully completed a Service Training Course for a product and the Dealer has become Service Authorized, an information package is provided to the Dealer. The Okidata Service Center Reference Guide outlines the following items. Responsibilities of Okidata Service Centers Spare parts and consumables information Procedures for warranty repairs Product Training, Certification, and Authorization Product Support information Okidata Depot information and services Third Party Service information Information about Okidata's Customer Information Center Okidata Service and Support telephone numbers. The Service Center Reference Guide contains the procedures to follow for ordering parts. Please read, understand, and follow these procedures. Service Authorization for a specific product must be obtained before a Dealer can submit warranty claims. Direct questions regarding the Service Center Reference Guide to Okidata Dealer Service. Refer to the Service Center Reference Guide for information on contacting Okidata. Placing a Parts Order All authorized Okidata resellers may order spare parts and consumables for Okidata products. Orders are placed through Okidata's Logistics Department. Please refer to your Service Center Reference Guide for details on ordering parts. You should have the following information available before you place your order. Okidata Dealer Authorization Number Okidata Customer Number Your Purchase Order Number
Okidata Part Number(s) Use this Appendix, Okilink II, Faxable Facts, or contact Okidata Technical Support to find the correct part number. Refer to the Service Center Reference Guide for information on contacting Okidata. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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B.2 CHARTS Below is an index to the illustrated parts breakdown charts. Description Printer Covers Printer Unit Printer Mechanism (1 of 3) Printer Mechanism (2 of 3) Printer Mechanism (3 of 3) Option Parts Consumables Packaging Documentation Service Training Kit Revisions Section B.2.01 B.2.02 B.2.03 B.2.04 B.2.05 B.2.06 B.2.07 B.2.08 B.2.09 B.2.10 B.2.11

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B.2.01 Printer Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.

Item 1

Okidata P/N Oki-J P/N 62407901 N/A
Description Printer: ML380 Parallel (120V) Epson/LQ Comp. Printer: ML380 Parallel (220V) Epson/LQ Comp.

Comments Refer to B.1.02

Disassembly Procedure N/A

62407902 N/A

Refer to B.1.02

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B.2.02 Covers Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.

Item 11

Okidata P/N Oki-J P/N 50071101 2PA4094-1078G1PP4094-1079P1PP4094-1080P2PP4094-1082P2PP4094-1081P1PP4094-1077P1PP4094-1076P+T2P3-8-HHC 53330101 2PP4094-1085P1PP4094-1074P4PB4025-1137P1
Description Separator: Sheet (Assembly) Separator: Sheet Support: Sheet Guide: Sheet (L) Guide: Sheet (R) Cover: Access Cover: Middle Screw: No. 3 x 8 MM Self Tapping Plate: Shield Cover: Lower Foot: Rubber
Comments Refer to B.1.02 RSPL Inc. 2 - 4
Disassembly Procedure 3.2.03 3.2.03 3.2.03 3.2.03 3.2.03
RSPL RSPL RSPL RSPL RSPL RSPL
3.2.03 3.2.03 3.2.20 3.2.20 3.2.20 3.2.20

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B.2.03 Printer Unit Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.

Item 12 12

Okidata P/N Oki-J P/N N/A 3YS4011-1187P2PP4043-3688P4YA4023-2011G3PP4025-2871P4YA4042-1450G816A0326M540A2046M540A2046M3PP4043-3783G1PA4094-1073G4YB4049-1482P4YB4049-1498P540A2046M540A2058T2132
Description AC Cable Separator: Paper Printhead Knob: Platen PCB: UMMB (Main Control) w/o ROM IC: EEPROM BR93CS46-Z-NW Fuse: 125V 1.6A Fuse: 125V 2.5A Sheet: Operation Panel Cover: Lower (Assembly) Power Supply Unit 120V Power Supply Unit 220/240V Fuse: 125V 3.15A Fuse: 250V 1.25A

Disassembly Procedure 3.2.01
RSPL RSPL RSPL RSPL RSPL RSPL RSPL RSPL RSPL RSPL RSPL RSPL RSPL
3.2.01 3.2.02 3.2.03 3.2.08 3.2.08 3.2.08 3.2.08 3.2.09 3.2.20 3.2.21 3.2.21 3.2.21 3.2.21

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B.2.04 Printer Mechanism (1 of 3) Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Okidata P/N Oki-J P/N 53510801 3PP4043-3755PLB-193000-1 N/A 4PP4050-2621P3PP4043-3683P4PP4043-3756G3PB4043-3772P4YX4043-3781G4PB4025-2843P2PP4043-3696P4PB4025-2842P3PP4043-3697P4PB4043-3809P4PP4043-3684P4PP4043-3685P3PP4043-3687P4PP4043-3769P4PP4043-3686P1

Description

Comments Refer to B.1.02 RSPL RSPL
Disassembly Procedure 3.2.04 3.2.06 3.2.06
Rack: Space Spring: Coil Screw: Self Tapping Pulley: Idle Bracket: Idle Pulley Motor: Line Feed Photosensor: (Assembly) Paper End Spring: Bail Arm (L) Bail Arm (L) Spring: Bail Arm (R) Bail Arm (R) Shaft: Indicator (Assembly) Bail Bar Bushing: Adjust (L) Bushing: Adjust (R) Lever: Adjust Shaft: Carriage Collar: Eccentric

RSPL RSPL RSPL RSPL

3.2.06 3.2.06 3.2.10 3.2.11
RSPL RSPL RSPL RSPL RSPL RSPL RSPL RSPL RSPL RSPL
3.2.12 3.2.12 3.2.12 3.2.12 3.2.12 3.2.13 3.2.13 3.2.13 3.2.13 3.2.13
N/A 4YS4011-1607G3PA4025-2811G5
Code: Earth Platen: (Assembly) RSPL

3.2.13 3.2.14

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B.2.05 Printer Mechanism (2 of 3) Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.

Item 11 A 11 B

Okidata P/N Oki-J P/N 50071701 3PA4043-3777G3PP4043-3703P4PP4043-3705P4PP4043-3782PN/A 51216001 4PP4025-2868P3PP4043-3704P3PA4043-3773G3PP4025-2819P4PP4025-2869P4YX4043-3780G4YX4043-3780G2PA4043-3751G3PB4043-3762P3PP4043-3690P1
Description Chute: Paper (Assembly) Lever: Release Gear: Change Spring: Change Gear Kit: Idler/Change Gear (ML300) Gear: Idler Link: Release Roller: Pressure (Assembly) Guide: Paper Pressure Gear: Tractor Microswitch: (Assembly) SASF Microswitch: (Assembly) Home Position Chassis: Mechanism (Assembly) Motor: Space (Assembly) Lever: Bottom Paper Guide
Comments Refer to B.1.02 RSPL RSPL RSPL RSPL RSPL Inc. 6

Disassembly Procedure 3.2.15 3.2.15 3.2.15 3.2.15 3.2.15 3.2.15
3.2.15 3.2.15 3.2.16 3.2.17 3.2.18 3.2.19

3.2.20

RSPL RSPL

3.2.22 3.2.23

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B.2.06 Printer Mechanism (3 of 3) Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.

Okidata P/N Oki-J P/N

Disassembly Procedure
50071501 4PA4043-3767G4PB4043-3759P4PP4043-3768P2PP4043-3801P4PP4043-3802P3PB4043-3766P4PP4025-1048P3PP4025-2836P4PP4043-3764G4PA4043-3779G4PP4043-3741P4PA4043-3778G4PB4043-3865P4PP4043-3784P1
Gear: Ribbon Feed (Assembly) Belt: Mini-Pitch (Space Belt) Slider Plate: Carriage Clamp: Belt Connector: Head (Assembly) Head Cable Clamp: Head Protector: Ribbon Frame: Carriage Tractor: Pin [L] (Assembly) Guide: Center Tractor: Pin [R] (Assembly) Shaft: Drive Shaft: Lock
3.2.05 3.2.06 3.2.06 3.2.06 3.2.06 3.2.07
RSPL RSPL RSPL RSPL RSPL RSPL RSPL RSPL
3.2.13 3.2.13 3.2.13 3.2.17 3.2.17 3.2.17 3.2.17 3.2.17

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B.2.07 Option Parts Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.

70000803

Kit: IBM PC Cable Kit for Parallel Printers Kit: Cut Sheet Feeder 3800 Single Bin (ML380) Kit: Super Speed RS-232C (ML380) Module: Interface (RS232C) Cover: Upper (RS232C I/F) PCB: UMRS (RS232C I/F) w/o ROM Cover: Lower (RS232C I/F) Kit: Pull Tractor (ML380) Unit: Tractor Cover: Tractor

Option

70016001
70016101 N/A 4YA4042-1451G2PP4043-3718P4YA4042-1451G2PP4043-3717P50072001 3PA4025-2971G1PP4094-1084P1
Option Incl Option Inc. 7 Option RSPL Part of 4 Option RSPL Part of 4 Option RSPL Part of 4 Option Inc 9 and 10 Option Part of 8 Option Part of 8

N/A N/A N/A N/A

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B.2.08 Consumables Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Okidata P/N Oki-J P/N 52104001 N/A
Description Ribbon: Cartridge
Comments Refer to B.1.02 Consumable
Disassembly Procedure 3.2.02

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B.2.09 Packaging Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information.
Okidata P/N Oki-J P/N 53506702 N/A
Description Box: Graphic (Microline 380)
53529702 N/A 53529701 N/A N/A N/A N/A N/A
Foam: End Cap (Left) Foam: End Cap (Right) Bag: Printer Bag: Accessories

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B.2.10 Documentation Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information. Item 1# 1# 1# Okidata P/N Oki-J P/N 58217701 N/A 58217702 N/A 58217703 N/A 58232301 N/A 52033001 N/A 53436029 N/A 58052101 N/A 59235901 N/A 59235902 N/A 59235903 N/A 59236401 N/A 59236501 N/A 59238401 Description Kit: ML380 Service Training Kit: ML380 Service Training Kit: ML380 Service Training Package: User's Documentation Card: QA Reply Bag: Poly 9" x 12" Guide: Customer Service Handbook: Printer Handbook: Printer Handbook: Printer Manual: Maintenance Manual: Troubleshooting Manual: Maintenance CSF 3800 Product Specifications Comments Refer to B.1.02 Document Document Document Document Inc. Document Part of 2 Document Part of 2 Document Part of 2 Document Part of 2 Document Part of 2 Document Part of 2 Document Document Document Disassembly Procedure N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A

58054901 N/A

Document

59239101

Product Specifications ML380 Serial Interface Product Specifications ML380 CSF 3800

59239001

* To order Marketing Literature, complete an Okidata Marketing Literature Order Form. Fax the completed form to Okidata Marketing Communications. * * Obtain this form by faxing a request to Okidata Marketing Communications. Refer to the Service Center Reference Guide for information on contacting Okidata.

Item 13

Okidata P/N Oki-J P/N N/A N/A 53547501 N/A 58067201 N/A 58052401 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
Description Okidata Service Center Reference Guide Okidata Support 3-Ring Binder ABCD Warranty Claim Forms (Pkg of 20) Warranty Summary Forms (Pkg of 20) Printer Drivers Product Updates Recommended Spare Parts List Software Technical Service Bulletins Marketing Literature Okidata Marketing Literature Order Form
Comments Refer to B.1.02 Document

Document Document

N/A N/A

22 * 23 * *

Document Refer to Okilink Document Refer to Okilink Document Refer to Okilink Refer to Okilink Document Refer to Okilink Document Document
N/A N/A N/A N/A N/A N/A N/A N/A
* To order Marketing Literature, complete an Okidata Marketing Literature Order Form. Fax the completed
form to Okidata Marketing Communications. * * Obtain this form by faxing a request to Okidata Marketing Communications. Refer to the Service Center Reference Guide for information on contacting Okidata.

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B.2.11 Service Training Kit Revision List P/N 58217701 Microline 380 Service Training Kit
This kit was replaced by P/N 58217702. Items in the training kit (except for the Printer Handbook) are NOT available separately.
Item 1A 2A 3A 4A 5A 6A 7A 8A 9A 10 A 11 A 12 A Okidata P/N Oki-J P/N 58217701 N/A 52046201 N/A 58055201 N/A 59238901 N/A 59238701 N/A 59235901 N/A 59238801 N/A 52046202 N/A 52046202 N/A 52046202 N/A 57517101 N/A 53533001 N/A Description Kit: ML380 Service Training Label: Kit Sheet: Cover Letter Guide: Study Manual: Training Handbook: Printer Service Videotape Label: Service Videotape Case Label: Service Videotape Front Label: Service Videotape Spine Red Vinyl Case (VHS Videotape) Storage Box Comments Refer to B.1.02 Document Document Document Document Document Document Document Document Document Document Document Document Disassembly Procedure N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A

P/N 58217702 Microline 380 Service Training Kit
This kit was replaced by P/N 58217703. Items in the training kit (except for the Printer Handbook) are NOT available separately.
Item 1B 2B 3B 4B 5B 6B Okidata P/N Oki-J P/N 58217702 N/A 52046201 Rev B N/A 58055202 N/A 59238702 N/A 59261901 N/A 59235903 N/A Description Kit: ML380 Service Training Label: Kit Sheet: Read Me First Handbook: Service User's Documentation Handbook: Printer Comments Refer to B.1.02 Document Document Document Document Document Document Disassembly Procedure N/A N/A N/A N/A N/A N/A
P/N 58217703 Microline 380 Service Training Kit
This kit replaces P/N 58217702. Items in the training kit (except for the Printer Handbook) are NOT available separately.
Item 1B 2B 3B 4B 5B Okidata P/N Oki-J P/N 58217703 N/A 52046203 N/A 58055203 N/A 59238703 N/A 59235903 N/A Description Kit: ML380 Service Training Label: Kit Sheet: Read Me First Handbook: Service Handbook: Printer Comments Refer to B.1.02 Document Document Document Document Document Disassembly Procedure N/A N/A N/A N/A N/A

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Service Guide ML380
Chapter 0 About This Manual

ML380 Dot Matrix Printer

Adobe Acrobat printable reference copy of the OKIDATA Service Training Manual. 09/17/97
Note: This Adobe Acrobat version of the Okidata Service Training Manual was built with the pictures rendered at 300 dpi, which is ideal for printing, but does not view on most displays well.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

Table of Contents

0 About This Manual Front Cover Manual Copyright 1 Product Specifications 1.1 Overview 1.2 Physical Specifications 1.3 Power Requirements 1.4 Environmental Conditions 1.5 Agency Approvals 1.6 Operational Specifications 1.7 Paper Specifications 1.8 Memory Specifications 1.9 Consumables 1.10 Options 1.11 Reliability 2 Principles of Operation 2.1 Principles of Operation - General Information.2.1.02 Microprocessor and Peripheral Circuits.2.1.03 Initialization.2.1.04 Interface Control.2.1.05 Printhead Drive Circuit.2.1.06 Spacing Drive Circuit.2.1.07 Line Feed Circuit.2.1.08 Alarm Circuits.2.1.09 Paper End Detection Circuit.2.1.10 Power Supply 2.2 Mechanical Operation - Printhead Mechanism.2.2.02 Spacing.2.2.03 Ribbon Drive.2.2.04 Paper Feed.2.2.05 Paper-End Detection.2.2.06 Semi-Automatic Sheet Feeder (SASF).2.2.07 Paper Park 3 Maintenance & Disassembly 3.1 Maintenance - General Information.3.1.02 Maintenance Tools.3.1.03 Maintenance Precautions 3.2 Disassembly/Assembly Procedures - General Information.3.2.01 Paper Separator.3.2.02 Printhead.3.2.03 Upper Cover Assembly.3.2.04 Space Rack 37 38
Table of Contents.3.2.05 Ribbon Feed Gear Assembly.3.2.06 Mini-Pitch (Space) Belt.3.2.07 Head Connector Assembly.3.2.08 Main Control Board (UMMB).3.2.09 Operation Panel.3.2.10 Line Feed Motor.3.2.11 Photosensor Assembly (Paper End).3.2.12 Bail Arms.3.2.13 Carriage Frame.3.2.14 Platen Assembly.3.2.15 Pressure Roller Assembly.3.2.16 Paper Pressure Guide.3.2.17 Tractor Assembly.3.2.18 Microswitch Assembly (SASF).3.2.19 Microswitch Assembly (Home Position Switch).3.2.20 Printer Mechanism.3.2.21 Power Supply Unit.3.2.22 Space Motor Assembly.3.2.23 Bottom Paper Guide Lever 3.3 Printer Adjustments.3.3.02 Gap Between Platen and Printhead.3.3.03 Space Belt Tension.3.3.04 Key Combinations.3.3.05 Menu Operation / Menu Select Mode - General Information.From Print Mode.From Power-OFF.Printing the Menu.Sample Menu.Reset Menu to Factory Defaults.Limited Operation.Menu Settings.3.3.06 Top of Form.3.3.07 Paper Park.3.3.08 Paper Tear Off.3.3.09 Resets 3.4 Cleaning 3.5 Lubrication 3.6 Shipping Instructions 4 Failure & Repair Analysis 4.1 Failure & Repair Analysis - Introduction.4.1.02 Printer Serial Number Identification.4.1.03 Firmware Revision Identification 4.2 Reporting Problems - General Information

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Table of Contents.4.2.02 Problem Lists.4.2.03 Reporting Methods 4.3 Troubleshooting Updates General Information 4.4 Troubleshooting Tips.4.4.02 Problem Categories.4.4.03 START HERE Flowchart.4.4.04 Tips for Preventing Image Problems.4.4.05 Common Problems 4.5 Abnormal Output 4.6 Fault Alarms - General Information.4.6.02 Fault Alarm Lamp Display 4.7 Repair Analysis Procedures (RAPS) - Using The RAPS.4.7.02 RAP Index.RAP 01: No Power.RAP 02: Space Operation Does Not Operate Normally.RAP 03: Wrong Character or Missing Dots.RAP 04: Line Feed Trouble.RAP 05: Data Receiving Failure 4.8 Printer Tests - General Information.4.8.02 Rolling ASCII Test.4.8.03 Font Test.4.8.04 Serial Interface Loopback Test - General Information.Loopback Connector Configuration Diagram.Procedure.Serial Cable Information.Serial Interface Signal Requirements.Commonly Used Serial Cable Configurations.4.8.05 Hexadecimal Dump Mode 4.9 Resistance Checks - General Information.4.9.02 Main Control Board (UMMB) Voltage Check Points.4.9.03 Connectors Block Diagram.4.9.04 Connector Location.4.9.05 Resistance Diagrams - Printhead.Space and Line Feed Motors.4.9.06 Head Cable Connection A Board Diagrams A1 Board Diagrams - General Information A.2 Index To Charts.A.2.01 Main Control Board (UMMB) Original.A.2.02 Main Control Board (UMMB) Current.A.2.03 RS232-C Serial Module (UMRS) B Illustrated Parts Listing B.1 Overview - General Information.B.1.02 Definition of Terms

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Table of Contents.B.1.03 Parts Ordering Information B.2 Charts.B.2.01 Printer.B.2.02 Covers.B.2.03 Printer Unit.B.2.04 Printer Mechanism (1 of 3).B.2.05 Printer Mechanism (2 of 3).B.2.06 Printer Mechanism (3 of 3).B.2.07 Option Parts.B.2.08 Consumables.B.2.09 Packaging.B2.10 Documentation.B.2.11 Service Training Kit Revision List

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1.3 POWER REQUIREMENTS 1.3.01 Input Power 120 VAC: +5.5 / -15% 220/240 VAC: +5.5 / -15% Single-phase AC 1.3.02 Power Consumption Operating: 90 VA Idle: 30 VA 1.3.03 Power Frequency 120 VAC: 50/60 Hz +/- 2% 220/240 VAC: 50/60 Hz +/- 2% Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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1.4 ENVIRONMENTAL CONDITIONS 1.4.01 Acoustic Rating 57 dBA 1.4.02 Altitude 10,000 feet (3,050 meters) 1.4.03 Ambient Temperature and Relative Humidity (RH) While operating: 41 to 95 degrees Fahrenheit (5 to 35 degrees Celsius) Operating humidity: 20% to 80% RH While in storage: -40 to 158 degrees Fahrenheit (-40 to 70 degrees Celsius) Storage humidity: 5% to 95% RH 1.4.04 Impact Non-operating: 3 G or less 1.4.05 Vibration Operating: 0.3 G (5 to 150 Hz) or less (except at resonating frequency) Non-Operating: 1 G (5 to 150 Hz) or less (except at resonating frequency) Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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1.5 AGENCY APPROVALS
1.5.01 Listings UL No: UL Standard No. 478 and 114 CSA No: CSA Standard C22.2 No. 154 FCC: FCC Certified per Part 15, Subject J, Class B VDE: VDE 0806, 0875 Class B, and 0836 BS: BS 5850 / 6204 IEC: 435 / 380 Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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1.6 OPERATIONAL SPECIFICATIONS 1.6.01 Character Matrix Sizes Table of Print Speed and Character Matrix Mode Speed Matrix (H x V) LQ 63 cps (12 cpi) 30 x 18 Utility 192 cps (12 cpi) 9 x 17 HS Utility 240 cps (15 cpi) 7 x 16
1.6.02 Characters Per Line Maximum Characters Per Line 17.Characters Per Inch
1.6.03 Character Pitches 5, 6, 8.5, 10, 12, 15, 17.1, 20 characters per inch Characters Per Inch = cpi The character pitches are selected through the following methods. Operator panel (front panel controls) Menu Select Mode (Menu Mode) Control codes in the software Special Microline 380 drivers 1.6.04 Character Sets Standard ASCII EPSON Character Set IBM Character Set I and II Foreign Language Sets (14) Line Graphics Zero / Slashed Zero 1.6.05 Emulation Epson LQ 1.6.06 Fonts

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2.1.03 Initialization The printer is initialized whenever it is powered ON or when the I-PRIME signal is received at the parallel interface. Initialization is started when the RST-P signal is sent from the reset circuit (Q8:Pin 1) to Q5, Q6 and Q7. When RST-P is generated, ROM program execution starts with the mode setting of Q5, Q6 and Q7. Next, ROM and RAM are checked for errors, RAM is initialized and the carriage is homed. The program finally establishes the Interface signals (output level of ACK, BUSY, etc.), switches the SELECT indicator ON, and informs the host computer that the printer is ready to receive data. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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2.1.04 Interface Control Parallel Interface The data from the interface is received through connector (CN-1) and the Interface LSI (Q7) latches this data in sync with the STB signal. The BUSY signal is switched ON as the data is processed. When processing is completed, the BUSY signal is switched OFF and an ACK signal is sent to the host to request more data. The BUSY signal is also switched ON when the printer is not able to receive data (buffer is full, printer is deselected or an error condition exists).

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2.1.05 Printhead Drive Circuit This circuit is used to drive the 24 print wires. The signals HD1 through HD24 control the individual print wires. The HD ON signal (even/odd trigger) enables the drive circuit when printing is desired. The head drive duration is determined by an RC integrating circuit which modifies the HD ON pulsewidth. The pulsewidth of the HD ON signal varies with the number of pins being driven. The drive time increases as more pins are driven, and decreases as fewer pins are driven. The RC circuit compensates for the fluctuation of drive voltage (+35 vdc).

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2.1.06 Spacing Drive Circuit The space motor is driven by a two-phase pulse motor. The phase signals (Phase 1, Phase 2, Phase 3 and Phase 4) and the basic pulse signals are output from the LSI (Q7). The pulse signals are modified by the drive voltage compensation circuit and sent back to the LSI (Q7). The space overdrive signals (Phase 1DVOV, Phase 2 DVOV, Phase 3DVOV and Phase 4DVOV) switch Q16 and Q17 ON, setting up the proper phase relationship of analog space motor drive signals (SP Phase 1 through SP Phase 4). These signals are then sent to the space motor.

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2.2.03 Ribbon Drive The ribbon drive mechanism moves the ribbon in synchronization with the space motor operation. The ribbon drive mechanism consists of the following items. Ribbon Drive Gear assembly Space Rack Ribbon Cartridge Ribbon Cartridge An endless ribbon with a single direction feed is used. Ink is supplied from an ink tank, which is built into the ribbon cartridge. Ribbon Feed Operation The rotation of the space pulse motor is transmitted to the drive gear in the ribbon cartridge through the space rack and ribbon feed gear assembly, thereby feeding the ink ribbon. The feed direction of the ribbon is maintained by switching the rotational direction of the gears in the ribbon drive assembly. This ensures uni-directional ribbon movement when bi-directional printing is used.

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2.2.04 Paper Feed Paper feeding is performed by turning the platen and the pin tractor. The tractor is driven by the line feed pulse motor. The paper feed mechanism consists of the following items. Pulse motor with gears Idler Gear Change Spring Change Gear Platen Tractor Feed Unit Pressure Roller Assembly Friction Feed When the release lever is set to the FRICTION FEED position, the change gear is disengaged from the tractor gear. At the same time, the release lever applies pressure to push the pressure rollers against the platen, allowing paper to be fed. Tractor Feed When the release lever is set to the TRACTOR FEED position, the release lever allows the reset spring to push the change gear toward the tractor gear. At the same time, the release lever pushes the pressure rollers away from the platen, allowing paper to be fed by the tractors.
NOTE: Drive power from the line feed motor is transferred from the platen to the idler gear and then to the change gear.

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2.2.05 Paper-End Detection Continuous Sheet Paper-End When continuous sheet paper is installed, the paper moves the continuous sheet paper-end lever to A1 and the sensor is switched ON. When out of continuous sheet paper, the paper-end lever moves to position B1 and the sensor is switched OFF indicating a paper-end condition. Bottom Feed Paper-End When paper is installed, it moves the bottom paper-end lever to position A2 and the sensor is switched ON. When a paper out condition exists, the bottom paper-end lever moves to position B2 and the sensor is switched OFF, indicating a paper-end condition. Cut-Sheet Paper-End When cut-sheet paper is installed, the paper moves the cut-sheet paper-end lever to position A3 and the sensor is ON. At the end of printing, the cut-sheet paper-end lever moves to position B3 and the sensor is switched OFF, indicating a paper-end condition.

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2.2.06 Semi-Automatic Sheet Feeder (SASF) The Semi-Automatic Sheet Feeder (SASF) is used to automatically set the print start position when using cut-sheet or continuous sheet paper. The procedure is as follows. Cut-Sheet SASF 1. Push the paper release lever to the cut-sheet side (rear of printer). 2. Insert the paper from behind the platen. 3. Open the paper bail arm (pull toward the front of the printer). This activates the SASF switch. 4. Line feed operation will feed the paper 2.76 inches. If the paper does not move, the SASF motion becomes invalid and is treated like an ordinary paper-end. 5. Once the paper bail arm is closed, a reverse line feed of about 0.18 inches is performed. This moves the paper to the print start position. Continuous Sheet (Rear Feed) SASF 1. Push the paper release lever to the continuous sheet side (front of the printer). 2. Insert the paper into the push tractor. 3. Open the paper bail arm (pull toward the front of the printer). This activates the SASF switch. 4. Line feed operation will feed the paper 3.6 inches. If the paper does not move within 2.4 inches of motion, the SASF motion becomes invalid and this is treated like an ordinary paper-end. 5. Once the paper bail arm is closed, a reverse line feed of about 0.18 inches is performed. This moves the paper to the print start position.

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2.2.07 Paper Park Paper park operates as follows. 1. Press PAPER PARK. 2. Reverse line feed retracts the paper until a PAPER-END condition exists
14 inches of paper have been fed. 3. When the PAPER-END condition exists, the printer retracts 0.49 inches of paper. The paper is still installed on the push tractor, but cut sheet paper may now be fed.

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Chapter 3 Maintenance & Disassembly
3.1 OVERVIEW 3.1.01 General Information This section lists the parts replacement, adjustment, cleaning, lubrication, and shipping procedures. Disassembly should not be performed unless absolutely necessary. NEVER perform disassembly on a malfunctioning printer until you have followed the failure analysis procedures in Section Four of this Service Handbook. Follow the procedures listed in Adjustments and Service Settings. Adjustments may be required when either consumable or parts are replaced. Failure to perform these procedures could result in unnecessary service calls. Proper performance of maintenance and cleaning will help to achieve the best possible print quality from the printer. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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3.1.02 Maintenance Tools The following tools are required to service the printer. #2 Phillips Screwdriver (with magnetic tip) Straight-slot Screwdriver Needle Nose Pliers (4 Inch) Awl or large, opened paper clip Wire Cutters Digital Multimeter Feeler Gauge (capable of measuring.014 inches) Shop Vacuum Clean, soft, and lint-free Cloth All-Purpose Cleaner Contact Kleen (Okidata P/N 51802301) Platen Cleaner Machine Grease Machine Oil Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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3.1.03 Maintenance Precautions 1. Do not disassemble the unit if it is operating normally. 2. Before starting disassembly and assembly, always turn the AC power switch OFF and pull out the AC plug. 3. Detach the interface cable, if installed. 4. Do not remove parts unnecessarily. Try to keep disassembly to a minimum. 5. Use the recommended maintenance tools. 6. When disassembling, follow the listed sequence. Failure to follow the correct sequence may result in damaged parts. 7. Since screws, collars and other small parts are easily lost, they should be temporarily attached to the original positions. 8. When handling circuit boards use extreme care. Integrated circuits (microprocessors, ROM, and RAM) can be destroyed by static electricity. 9. Do not place printed circuit boards directly on conductive surfaces. 10. Follow the recommended procedures when replacing assemblies and units. 11. Perform the printhead gap adjustment procedure when any of the following occur. Refer to Section 3.3 of this Service Handbook. Print Quality is darker on one side of the document. Parts are replaced. Printhead (3.2.02) Space Rack (3.2.04) Carriage Frame (3.2.13) 12. Perform the space belt tension adjustment procedure when the following parts are installed. Refer to Section 3.3 of this Service Handbook. Space Belt (3.2.06) Space Motor Assembly (3.2.22) Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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3.2 DISASSEMBLY/ASSEMBLY PROCEDURES General Information This section contains the printer disassembly procedures. Only the removal procedures are explained here. Reverse the procedure for the installation. At the bottom of each procedure is a listing of the parts covered in that procedure. The Okidata part number, item description, comment (RSPL, Option, Consumable) and cross-reference to Appendix B is provided for each part. Items included in the Recommended Spare Parts List are indicated by the acronym RSPL. N/A will appear where a part number is not available. Part Item Comment Appendix B Number Description Reference This Service Handbook lists the disassembly procedures for major components of the unit. Okidata DOES NOT recommend disassembling a unit which is operating normally. If you decide to perform disassembly during this training, Okidata recommends that you perform only the disassembly procedures for RSPL items. All other procedures are provided to assist you in identifying parts. It is not likely that you will perform these procedures while servicing the unit. Be sure to read all notes, cautions, and warnings, as they contain important information regarding disassembly / assembly. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

P/N 53510801 Rack: Space RSPL B.2.04

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3.2.05 Ribbon Feed Gear Assembly 1. Perform this procedure: 3.2.02. 2. Release the four claws (1). 3. Insert a screwdriver into the grooves (2) and pry the claws away from the carriage plate (3). 4. Lift the ribbon feed gear assembly (4) in the direction of arrow A. Slide it in the direction of Arrow B, and remove it. P/N 50071501 Gear: Ribbon Feed (Assembly) RSPL B.2.06

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3.2.06 Mini-Pitch (Space) Belt 1. Perform these procedures: 3.2.02 and 3.2.05.
2. Use pliers to remove the belt tension spring (1). 3. Loosen the screw (2). 4. Remove the belt (3) from the idle pulley (4). 5. Remove the head connector assembly (5) from the carriage plate (6). 6. Remove the carriage plate. 7. Detach the belt from the space motor assembly gear (7). 8. Remove the belt clamp (8) mounted to bottom of the carriage plate. 9. Use a screwdriver to push the claw of the belt clamp in the direction of arrow A. Then, remove the belt clamp and belt by lowering the claw in the direction of arrow B.
NOTE: Perform the space belt tension adjustment procedure after installing this part. Refer to Section 3.3 of this Service Handbook.
P/N 50904801 Spring: Coil RSPL B.2.04 P/N 51304001 Belt: Mini-Pitch (Space Belt) RSPL B.2.06 P/N N/A Screw: Self Tapping B.2.04 P/N 51004001 Slider RSPL B.2.06 P/N 51219201 Pulley: Idle RSPL B.2.04 P/N 53330401 Plate: Carriage RSPL B.2.06 P/N 50704701 Clamp: Belt RSPL B.2.06 P/N 53330301 Bracket: Idle Pulley RSPL B.2.04

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3.2.07 Head Connector Assembly 1. Perform these procedures: 3.2.01 , 3.2.02 , 3.2.03 , 3.2.05 , and 3.2.06.
2. Remove the two head cables (1) from the connectors (2) on the control board. When cable clamp (3) is lifted, the head cables can be removed. 3. Pull the head cables under the cable guides (4), and remove the head cables. P/N 56725301 Connector: Head (Assembly) RSPL B.2.06 Head Cable

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3.2.08 Main Control Board (UMMB) 1. Perform these procedures: 3.2.01 and 3.2.03.
2. Remove the five connectors (1) connected to the control board (2). 3. Remove the five screws (3). 4. Release the two claws (4), and move the control board in the direction of arrow A to remove. P/N 55047801 PCB: UMMB (Main Control) RSPL B.2.03 w/o ROM P/N 55938501 IC: EEPROM BR93CS46-Z-NW RSPL B.2.03 P/N 56304201 Fuse: 125V 1.6A RSPL B.2.03 P/N 56304301 Fuse: 125V 2.5A RSPL B.2.03

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3.2.09 Operation Panel 1. Perform these procedures: 3.2.01 and 3.2.03.
2. Use a screwdriver to release the six claws (1) on the operation panel (2) and remove the operation panel from the control board (3). P/N 53524301 Sheet: Operation Panel RSPL B.2.03

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3.2.10 Line Feed Motor 1. Perform these procedures: 3.2.01 and 3.2.02.
2. Use a screwdriver to open the lock levers (1) in the directions of arrows A and B, and push the bracket (2) of the line feed motor (3) in the direction of arrow C. 3. Pull the line feed motor out of the guide holes (4), in the direction of arrow D.
NOTE: After installation, check that the platen gear (5) engages firmly and rotates smoothly.
P/N 56507801 Motor: Line Feed RSPL B.2.04

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3.2.11 Photosensor Assembly (Paper End) 1. Perform these procedures: 3.2.01 , 3.2.02 and 3.2.10.
2. Pull the paper end sensor (1) from the sensor guide (2). P/N 56106901 Photosensor: (Assembly) RSPL B.2.04 Paper End

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3.2.12 Bail Arms 1. Perform these procedures: 3.2.01 , 3.2.02 , 3.2.10 , and 3.2.11.
2. Use pliers to remove the left bail arm spring (1). 3. Push claw (2) downward, pull it out of guide hole (3) of main frame and remove the left bail arm (4). 4. Remove the left bail arm from the bail bar (5). 5. Use pliers to remove the right bail arm spring. 6. Push claw downward, pull it out of guide hole of main frame and remove the right bail arm. 7. Remove the right bail arm from the bail bar. P/N 50911801 Spring: Bail Arm (L) RSPL B.2.04 P/N 53511001 Bail Arm (L) RSPL B.2.04 P/N 50911701 Spring: Bail Arm (R) RSPL B.2.04 P/N 53511101 Bail Arm (R) RSPL B.2.04 P/N 51110501 Shaft: Indicator (Assembly) RSPL B.2.04 Bail Bar

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3.2.13 Carriage Frame 1. Perform these procedures: 3.2.01 , 3.2.02 , and 3.2.03.
2. Open the supporting point A, and remove the head clamp (1). 3. Insert a screwdriver into the groove of carriage frame (2), and remove ribbon protector (3). 4. Turn the white left adjust bushing (4) to the lower end, and remove it. 5. Turn the black right adjust bushing (5) to the lower end, and remove it. 6. Turn the blue adjusting lever (6) to the lower end. 7. Slide the carriage shaft (7) to the right. 8. Remove the shaft and the adjusting lever. 9. Pull the carriage shaft in the direction of arrow B, and remove it from the carriage frame (8). Be careful not to lose the eccentric collar (9). When installing the eccentric collar, place notched section (10) toward the carriage shaft.

Determine the preference of the end user regarding this feature. If the printer is on a network, do not reset this item without discussing the change with the network supervisor.
To access the menu when the printer is set to Limited Operation, follow this procedure. 1. Verify that continuous feed paper is installed. CAUTION:
If paper is not installed, the printhead will print on the platen. This could damage / destroy the printhead, platen, and ribbon.
2. Verify that the ribbon is correctly installed. 3. Power off the printer. 4. Press and hold FONT while powering ON the printer. 5. The SELECT lamp will not be lit. When in Menu Mode, the functions printed below the operator panel switches are active.
6. Press GROUP until General Control prints. 7. Press ITEM until Operator Panel Function prints. 8. Press SET until FULL OPERATION prints. 9. Press EXIT to save the change and exit Menu Mode. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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Menu Settings Factory default settings are printed in Bold Italic. Group Font Item Print Mode Pitch Style Size Cut Sheet Feeder General Control Graphics Setting
LQ Courier LQ Swiss LQ Roman LQ Orator LQ Prestige LQ Gothic Utility 15 17.cpi Proportional Normal Italic Single Double Not Installed; Installed Uni-directional bi-directional No Yes O -1 -2 -3 -4 -5 +5 +4 +3 +2 +1 Full Operation Limited Operation Parallel Serial LPI Off On No Yes No Yes 2/3.5.8.5 " Set I Set II Epson American French German British Danish I Swedish Italian Spanish I Japanese Norwegian Danish II Spanish II Latin American French Canadian Slashed Unslashed 0 1

Paper Out Override

Print Registration Operator Panel Functions Interface Vertical Control Line Spacing Form Tear-Off Skip Over Perforation Auto LF Page Length Symbol Sets Character Set Language Set
Zero Character Number of DLL Sets

Parallel I/F

I-Prime Signal
Auto Feed XT Pin 18 Output
Valid Invalid Invalid Valid

0v +5v

Serial I/F
Parity Serial Data 7 or 8 Bits Protocol
None Odd Even 8 Bits 7 Bits Ready / Busy X-ON / X-OFF No Yes SSD- SSD+ DTR RTS 19200 bps Valid Invalid Ready on Power Up Ready on Select 200 milliseconds 1 second

Diagnostic Test

Busy Line Baud Rate DSR Signal DTR Signal Busy Time

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3.3.06 Top of Form General Information Top of Form is the distance from the top edge of the paper to the first print position on the page (the highest vertical position on the page where the first line of printing will appear). When setting the top of form, use the lower red line on the ribbon protector as a guideline. The red line shows the baseline of the current printing position. The Top of Form may be set for each of the paper paths. Cut Sheet (single-sheet) Rear Feed Rear Feed With Pull Tractor Bottom Feed Cut Sheet (Single Sheet) 1. Load paper into the printer. 2. Press the SELECT button to deselect the printer. The SELECT lamp will go out. 3. To move the paper, do either of the following. To move the paper up, press and hold TOF/PARK and press FEED. To move the paper down, press and hold TOF/PARK and press FONT. This moves the paper in increments of 1/180 of an inch. 4. Press TOF/PARK to store the top of form position in memory. 5. Press the SELECT button to select the printer. The SELECT lamp will light. Rear Feed 1. Load paper into the printer. 2. Press the SELECT button to deselect the printer. The SELECT lamp will go out. 3. To move the paper, do either of the following. To move the paper up, press and hold TOF/PARK and press FEED. To move the paper down, press and hold TOF/PARK and press FONT. This moves the paper in increments of 1/180 of an inch. 4. Press TOF/PARK to store the top of form position in memory.

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4.3 TROUBLESHOOTING UPDATES 4.3.01 General Information Okidata distributes updated troubleshooting information in three ways. Okilink II Faxable Facts Technical Service Bulletins 4.3.02 Okilink II Okilink II is Okidata's Bulletin Board Service. This service is available to all Okidata Certified Service Technicians. Okilink II provides troubleshooting and service information. Technicians can download files, ask questions of Okidata's technical support personnel, and participate in round table discussions about Okidata products and services. Technical Service Bulletins, Recommended Spare Parts Lists, Printer Drivers, Product Specifications, and Service Training Information are also available. Refer to the Service Center Reference Guide for information on accessing Okilink II. 4.3.03 Faxable Facts Okidata's Faxable Facts is an automated fax document retrieval system. It is maintained by Okidata's Customer Information Center. Answers to common questions about Okidata products are available through Faxable Facts. Refer to the Service Center Reference Guide for information on accessing Faxable Facts. 4.3.04 Technical Service Bulletins Okidata's Technical Service Bulletins (TSB's) contain technical information developed after product release. Firmware updates, part number changes, and procedural changes are some of the subjects covered by these bulletins. The TSB's are distributed through Okilink II. Refer to the Service Center Reference Guide for information on accessing Okilink II. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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4.4 TROUBLESHOOTING TIPS 4.4.01 Preliminary Checks 1. Is the product being operated under the proper ambient conditions? 2. Does the paper being used meet the specifications for this product? 3. Has the ribbon been replaced as recommended? 4. Has the ribbon been installed properly? 5. Is an Okidata ribbon being used? 6. Is the printhead gap correctly set? 7. Is the firmware the latest (current) revision? 8. Are the printer drivers being used correct for the printer? 9. Is the printer driver being used the latest (current) release? Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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4.4.02 Problem Categories There are three categories of problems that you might encounter when servicing the printer. SELECT Lamp Blinks (Fatal Errors) The following can cause the SELECT lamp to blink. Open Bail Arm Jammed Paper Printhead Cannot Move Other Fatal Error When the SELECT Lamp is blinking, check the items listed below. 1. Close the bail arm. 2. Check for a paper jam. 3. Verify that the printhead moves freely. 4. Record the status of the POWER, SELECT, Font Indicators, and Pitch Indicator Lamps. 5. Refer to the Fault Alarms Tables (Section 4.6) 6. Locate the error. 7. Perform the designated corrective action. Operational Errors An Operational Error is usually not accompanied by a fault alarm indication. Refer to the Start Here Flowchart (Section 4.4.03) and perform the corrective action. SELECT Lamp Blinks Slowly (Paper End/Jam Conditions) A slowly blinking SELECT lamp usually indicates a cover open, paper jam or paper-end (out of paper) condition. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

The I-Prime signal is sent over the parallel interface and will automatically override any settings you have made using the front panel buttons. To eliminate this problem, go into the Menu Select Mode and change the I-Prime item to INVALID. This will cause the printer to ignore the I-Prime Signal. 6. The FONT and PITCH buttons wont work. The Operator Panel Functions item in the Printer Menu can be used to disable these buttons. If the printer is part of a customized system or if it is used by a number of people, the system manager may have used this option to make sure the printer is always set properly. 7. None of the lights in the FONT indicator on the front panel are lit. The lights in the FONT indicator on the front panel all go out when the printer is operating in the utility mode. The lights will come on again as soon as you select an LQ font. 8. You need to check the data sent by the computer to the printer. Use the hexadecimal dump mode. To enter this mode, hold the SELECT and TOF/PARK buttons down while powering ON the printer. All data sent to the printer, including text and printer commands, will print in both hexadecimal and ASCII format. In the ASCII format, all non-printable codes will be represented by a period. To return to normal printing, power OFF the printer, then power ON. 9. Static electricity causes the paper to stick. In cold, dry weather, static charges can build up on continuous feed paper. This can make the paper cling to the paper separator. If you have this problem during high-volume printing jobs, try moving the single sheet paper guides on the separator together so that the paper rests on the guides rather than on the separator itself. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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4.5 ABNORMAL OUTPUT 4.5.01 Output Samples
Light Print on the Entire Page Possible Causes: 1. Ribbon is "dried out". Replace the ribbon. 2. Verify that the headgap lever setting is appropriate for the type of paper being used. 3. Check / perform the printhead gap adjustment. 4. Paper is not within specification. Refer to Section One for paper specification. Uneven Print Density Possible Causes: 1. Printhead gap not within specification. Perform the printhead gap adjustment. 2. Defective platen. Replace the platen. Smeared Print Possible Causes: 1. Ribbon protector is missing or broken. Replace the ribbon protector. 2. Verify that the headgap lever setting is appropriate for the type of paper being used. 3. Check / perform the printhead gap adjustment. 4. Paper is not within specification. Refer to Section One for paper specification. Inconsistent Line Feed Possible Causes: 1. Power OFF the printer. Turn the platen knob. The platen should rotate smoothly. If it does not, remove the cause of the binding. 2. Defective line feed motor. Replace the line feed motor. Drifting Margin Possible Causes: 1. Power OFF the printer. Move the carriage assembly. The carriage should move smoothly. If it does not, remove the cause of the binding. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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RAP 03: Wrong Character or Missing Dots START Are connectors CN6 and CN7 on the control board connected properly? NO Connect them properly. YES Is the head cable inserted into the printhead connector correctly? NO Seat the head cable to the printhead connector correctly. YES Replace the printhead. Is condition corrected? YES End of procedure. NO Replace the control board. Is condition corrected? YES End of procedure. NO Replace the head cable. End of procedure. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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RAP 04: Line Feed Trouble START Rotate the platen knob. Does the platen rotate smoothly? NO Ensure no foreign matter or dust is present on the platen gear, or line feed motor gear. Check for smooth meshing of the platen gear and line feed motor gear. Ensure correct operation of the push tractor assemblies (both right and left), and the tractor drive gears. YES Is connector CN4 on the control board connected properly? NO Connect it properly. YES Is fuse F1 on the control board open? YES Replace fuse. NO Replace the line feed motor. End of procedure. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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RAP 05: Data Receiving Failure START Is the SELECT Lamp ON? NO Press the SELECT Switch YES Is the interface cable connected correctly? NO Connect it correctly. YES Is the serial interface module properly seated? NO Properly install the serial interface module. YES Are the serial interface parameters properly set in the menu? Refer to the Printer Handbook, Chapter Three
Refer to Section Three of this Service Handbook. YES Replace the serial interface module NO Set the serial interface parameters through the menu Refer to the Printer Handbook, Chapter Three. End of procedure. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

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4.8 PRINTER TESTS 4.8.01 General Information This section covers the tests listed below. Rolling ASCII Test Font Test Serial Interface Loopback Test Hexadecimal Dump Mode The Rolling ASCII and Font Tests check print operations. The Serial Interface Loopback Test checks the operation of the serial interface board. The Hexadecimal Dump Mode checks the data transfer between the computer and printer. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

Items with the comments RSPL (Recommended Spare Parts List), Consumable, Document, or Option are available from Okidata. Items without these comments are usually not stocked. Some items are only available as assemblies. Every effort has been made to clearly indicate which items are in assemblies and which are not. N/A will appear where a part number is not available Current Part Numbers Okidata has made every effort to include current part numbers in this Service Handbook at the time of publishing. However, technical information frequently changes. These changes often include new or modified parts, with new or modified part numbers. Please refer to the following resources for current part numbers and pricing. Okidata's Electronic Bulletin Board (Okilink II) contains current part numbers, prices, and recommended stocking levels for each item listed as a recommended spare part. For instructions on accessing Okilink II, refer to the Service Center Reference Guide. Okidata's Faxable Facts is an automated fax document retrieval system. Part numbers and pricing are available through Faxable Facts. For instructions on accessing Faxable Facts, refer to the Service Center Reference Guide. Okidata's Technical Information Group is a telephone support line reserved for Authorized Dealers. Part numbers and pricing are available through Technical Information. For instructions on accessing Technical
Information, refer to the Service Center Reference Guide. REMEMBER
Current part numbers, recommended stocking levels, and pricing information are available through Okilink II, Faxable Facts, and Technical Information. Refer to the Service Center Reference Guide for information on accessing these resources.

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B.1.02 Definition of Terms Assemblies Assemblies are parts grouped under a single description and/or part number. Generally, individual items in an assembly are not available from Okidata. Assemblies are surrounded by broken line boxes in the diagrams. Assemblies will say "Includes xx xx" under the Comments section of the tables. Parts in assemblies will say "Part of xx" under the Comments section of the tables. Blank Okidata does not recommend stocking this item. This item should be purchased on an As Required Basis only. The availability of this item is NOT guaranteed by Okidata. Consumable A consumable is a supply item which has a specified life and must be periodically replaced. It is purchased and installed by the end user. Okidata machines are designed to work exclusively with Okidata consumables. By using genuine Okidata consumable products, the investment made in the equipment is protected. Document A document is a printed item which supports the service and marketing of a product. Various documents are available from Okidata. Drivers Printer drivers are updated frequently. Please refer to Okilink II for the latest printer driver information. Firmware Firmware is revised frequently. Please refer to Okilink II for the latest firmware information. Option An option is a part/assembly which is added to a product. The option expands the products functionality. An option may or may not be installed by the end user. Instructions for installation accompany each option. Option RSPL