OKIDATA ML320 Service Manual
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OKIDATA ML320 Service Manual

Dot matrix printers
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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)
ML320/ML321
Dot Matrix Printers
Adobe Acrobat printable reference
copy of the OKIDATA Service Training Manual.
Service Guide ML320/ML321
Chapter 0 About This Manual
09/17/97
Page: 1

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Summary of Contents for OKIDATA ML320

  • Page 1 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.

  • Page 2: Table Of Contents

    Table of Contents Page Service Guide ML320/ML321 0 About This Manual Front Cover Manual Copyright Manual Part Number and Revision 1 Product Specifications 1.1 General Description ..1.1.02 Serial Number Identification & (A-D) Revision Levels ..Compatibility Chart 1.2 Product Specifications 1.3 Paper Specifications 1.4 Physical Specifications...
  • Page 3 Table of Contents Page ..3.1.01 General Information, Tools & Precautions 3.2 Disassembly/Assembly Procedures ..3.2.01 Preliminary Items ..3.2.02 Separator Assembly ..3.2.03 Printhead Assembly ..3.2.04 Upper Cover Assembly ..3.2.05 Operator Panel Assembly ..3.2.06 Control Board (Rev A & B) ..Control Board (Rev C) ..Control Board (Rev D) ..3.2.07 IC Card (A) Panel ..3.2.08 Transformer (Rev A &...
  • Page 4 Table of Contents Page Failure & Repair Analysis Introduction 4.4 Troubleshooting Tips ..4.4.02 Common Problems 4.5 Fault Alarms 4.6 Repair Analysis Procedures - Using The Raps 4.6.02 RAP Index ..4.6.03 Troubleshooting Cautions ..RAP 01A:Operator Panel Lamps Do Not Light - Rev A, B, and C ..RAP 01B: Operator Panel Lamps Do Not Light - Rev D ..RAP 02A: Abnormal Spacing - Rev A, B, and C...
  • Page 5 Table of Contents Page ..A.2.06 Filter Assembly - Rev A, B, C, and D ..A.2.07 Operator Panel (LXSP) - Rev A, B, and C ..A.2.08 Operator Panel (LXON) - Rev D ..A.2.09 RS232-C Serial Interface (LXHI) - Rev A, B, C, and D B Illustrated Parts Listing Illustrated Parts Listing - General Information ..B.1.02 Definitions of Terms...
  • Page 6 This document may not be reproduced without written permission of the Okidata® Technical Training Group. Every effort has been made to ensure the accuracy of the information contained in this training course. Okidata is not responsible for errors beyond its control. © 1994 by Okidata All rights reserved.
  • Page 7 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)

  • Page 8: About This Manual

    Page: 3 Service Guide ML320/ML321 Chapter 0 About This Manual Manual Part Number and Revision 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)

  • Page 9: Product Specifications

    Both printers feature an enhanced operator panel which provides access to the following capabilities. Menu Selection Quiet Mode Printer Tests Paper Park Print Characteristics Standard Printer Controls 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)

  • Page 10: Serial Number Identification & (A-D) Revision Levels

    Page: 5 Service Guide ML320/ML321 Chapter 1 Product Specifications 1.1.02 Serial Number Identification & (A-D) Revision Levels Rev A units are original production units. An interconnect module connects the power supply board to the main control board. Rev B units are retrofitted to include a modified interconnect module, which prevents corrosion.
  • Page 11 Item Okidata Purpose / Function of Item LXMC 55041411 Main Control Board Board LXMC- 55041412 Main Control Board 3 Board LXMR 55075111 Main Control Board (with SSD) Power Supply Board Item Okidata Purpose / Function of Item PAII-2 55039902 Power Supply Board...
  • Page 12 Transformer - Microline 320 (with Volt SSD) XFRMR 56413202 Transformer - Microline 321 (with Volt SSD) XFRMR Interconnect Module Item Okidata Purpose / Function of Item Interco 55328301 Connects power supply board to nnect main board Module Cable Item Okidata...
  • Page 13 Middle Cover - Microline 320 (with SSD) Chassis 50104601 Middle Cover - Microline 321 (with SSD) 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)

  • Page 14: Compatibility Chart

    Page: 6 Service Guide ML320/ML321 Chapter 1 Product Specifications Compatibility Chart Item Okidata Purpose / Function of Item LXMC 55041411 Main Control Board Board LXMC- 55041412 Main Control Board 3 Board LXMR 55075111 Main Control Board (with SSD) Power Supply Board...
  • Page 15 Transformer Item Okidata Purpose / Function of Item 56407503 Transformer - Microline 320 Volt XFRMR 56407502 Transformer - Microline 321 Volt XFRMR 56413201 Transformer - Microline 320 (with Volt SSD) XFRMR 56413202 Transformer - Microline 321 (with Volt SSD) XFRMR...
  • Page 16 Middle Cover - Microline 320 (with SSD) Chassis 50104601 Middle Cover - Microline 321 (with SSD) 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)

  • Page 17: Product Specifications

    Page: 7 Service Guide ML320/ML321 Chapter 1 Product Specifications PRODUCT SPECIFICATIONS 1.2.01 Print Method Impact Dot Matrix Number of Print Wires: 9 Print Wire Diameter: .013 inch (.34 mm) 1.2.02 Print Modes Revs A, B, and C High Speed Draft (HSD)
  • Page 18 Print Mode 10 cpi 12 cpi 17.1cpi 20 cpi 360 cps 300 cps 300 cps 300 cps 300 cps Utility 250 cps 250 cps 250 cps 250 cps 62.5 cps 62.5 cps 62.5 cps 62.5 cps Print Speed at Different CPI for the ML 320/321 Mode Horiz.
  • Page 19 A shielded cable is required. Twisted-pair wires are recommended for noise protection. Parallel interface cables should be no more that 16.4 feet (5 m) in length. 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)

  • Page 20: Paper Specifications

    Page: 8 Service Guide ML320/ML321 Chapter 1 Product Specifications PAPER SPECIFICATIONS 1.3.01 Width Microline 320 Minimum: 3 inches (76.2 mm) Maximum: 10 inches (254 mm) Microline 321 Minimum: 3 inches (76.2 mm) Maximum: 16 inches (406.4 mm) 1.3.02 Single Part Forms...
  • Page 21 Maximum: 0.004 inches (0.10 mm) Dimensions Maximum: 8.5 inches wide x 11 inches long (216 mm x 260 mm) 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)

  • Page 22: Physical Specifications

    Microline 321 Revs A, B, and C: 20 pounds Rev D: 22.2 pounds (10.1 kg) 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)

  • Page 23: Power Requirements

    Revs A, B, and C Operating: 315 VA Idle: 80 VA Rev D Operating: 70 VA Idle: 25 VA 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)

  • Page 24: Environmental Requirements

    Storage 5% to 95% 1.6.03 Acoustic Specifications Standard Operation 57 dba Quiet Mode 52 dba 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)

  • Page 25: Agency Approvals

    VDE 0806, VDC 0875 Class B BS5850 Rev D VDE 0806, VFG 0243 Class B BS7002 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)

  • Page 26: Options

    Pull Tractor with Acoustic Cover Cut Sheet Feeder with Access Cover (CSF-3000A) Super-Speed RS232-C Serial Interface Board 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)

  • Page 27: Consumables

    Chapter 1 Product Specifications CONSUMABLES 1.9.01 Cartridge Ribbon Black 3 million character ribbon life Re-inking cartridge 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)

  • Page 28: Memory Specifications

    1.10.04 Image Buffer 13.2 Kbytes 1.10.05 Receive Buffer Epson Mode: 28 Kbytes IBM Mode: 16 Kbytes 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)

  • Page 29: Reliability Specifications

    200 million characters in 10 cpi utility print quality. 35% page density and 25% duty cycle 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)

  • Page 30: Principles Of Operation

    Page: 17 Service Guide ML320/ML321 Chapter 2 Principles of Operation PRINTER OVERVIEW 2.1.01 General Information This section describes the operation of the printer. It is divided into three parts. 1) Circuit Board Description ( ) The major components of the main controller board are described and functional descriptions of the operator panel board and power supply are provided.
  • Page 31 401 (4 = year. 01 = month) Revision Serial Number 0154693 For more information see the compatibility chart ( 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)

  • Page 32: Circuit Board Description

    Chapter 2 Principles of Operation CIRCUIT BOARD DESCRIPTION Operator Panel Board Power Supply Control Board Large Scale Intergrated Circuitry 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)
  • Page 33 For specific information on the capabilities and use of the operator panel, please refer to Chapter 4 ( ) in the Printer Handbook. 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)
  • Page 34 These AC voltages are rectified into + 8 vdc, + 5 vdc, and + 50 vdc levels by the DC power supply circuitry on the main controller board. 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)

  • Page 35: Control Board

    All character fonts Q12 has a battery backup. Data is retained even after power is removed. 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)

  • Page 36: Large Scale Integrated Circuitry (Lsi)

    Page: 22 Service Guide ML320/ML321 Chapter 2 Principles of Operation Large Scale Integrated Circuitry (LSI) For the Rev A, B, and C printers, the LSI is Q11 - MSM6990 For the Rev D printers, the LSI is Q3 - 7U042-026.
  • Page 38 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)

  • Page 39: Electrical Operation

    2.3.02 Interface Control 2.3.03 Print Head Drive Circuit 2.3.04 Spacing Operation 2.3.05 Line Feed 2.3.06 Alarm Circuit 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)

  • Page 40: Initialization

    The program then establishes the interface signals (ACK, BUSY) and the SEL lamp lights. 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)

  • Page 41: Interface Control

    The BUSY signal is also sent to the host whenever the printer is incapable of receiving 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)

  • Page 42: Print Head Drive Circuit

    IPT, which is derived from the timing encoder (PHASE A and PHASE B) on the space motor. 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)

  • Page 43: Spacing Operation

    The LSI generates the IPT-N signal, which provides dot-on timing and carriage position detection. 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)

  • Page 44: Line Feed

    When it is not being driven, the line feed motor is held in place by the LF HOLD signal. 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)

  • Page 45: Alarm Circuit

    This causes the signal PAPER END to become low. This signal is fed to a pin of the motor control LSI. Printing stops and the ALARM lamp lights. 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)
  • Page 46 Page: 30 Service Guide ML320/ML321 Chapter 2 Principles of Operation MECHANICAL PRINCIPLES OF OPERATION...
  • Page 47 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)

  • Page 48: Printhead

    Page: 31 Service Guide ML320/ML321 Chapter 2 Principles of Operation 2.4.01 Printhead The printhead used by the printer is a highly efficient, stored-energy type. Power is not consumed until the pins are activated. Printhead life is approximately 200 million characters.
  • Page 49 110 degree Celsius threshold, the BUSY signal to the host computer becomes inactive. Printing is resumed. 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)

  • Page 50: Space Mechanism / Operation

    Page: 32 Service Guide ML320/ML321 Chapter 2 Principles of Operation 2.4.02 Space Mechanism / Operation The spacing operation is performed by applying power to the DC spacing motor. This drives the carriage frame along the carriage shaft, space rack, and guide rail. The carriage shaft, space rack, and guide rail are parallel to the platen.
  • Page 51 The position of the carriage frame is obtained by counting the pulses generated by the encoder disk sensor as the disk turns. 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)

  • Page 52: Head Gap Adjusting Mechanism

    Page: 33 Service Guide ML320/ML321 Chapter 2 Principles of Operation Head Gap Adjusting Mechanism The head gap adjusting mechanism adjusts the gap between the platen and printhead by changing the tilt angle of the carriage frame. This is accomplished by using the adjusting lever.
  • Page 54 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)

  • Page 55: Ribbon Drive Mechanism / Operation

    Page: 34 Service Guide ML320/ML321 Chapter 2 Principles of Operation 2.4.03 Ribbon Drive Mechanism / Operation NOTE: The ribbon drive gear assembly is secured to the top of the spacing motor assembly by the four claw tabs. The ribbon drive mechanism drives the ribbon in sync with the spacing operation. The mechanism is driven by the spacing motor.
  • Page 56 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)

  • Page 57: Paper Feed Mechanism

    Page: 35 Service Guide ML320/ML321 Chapter 2 Principles of Operation 2.4.04 Paper Feed Mechanism The paper feed mechanism consists of the following items. Stepper Motor (with drive gear) Reduction Gear Platen Push Tractor Unit Pressure Rollers (friction feed rollers) Pull Tractor Unit (optional) Paper Feed Operation The line feed motor is mounted on the left side frame of the printer.
  • Page 58 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, which allows paper to be fed by the push tractor.
  • Page 59 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)

  • Page 60: Paper-End Detection Mechanism

    Page: 36 Service Guide ML320/ML321 Chapter 2 Principles of Operation 2.4.05 Paper-End Detection Mechanism Rear Paper Feed When paper is installed in the printer, it prevents the paper-end lever (Tip A) from falling into the groove of the paper chute and platen. This activates the paper-end sensor.
  • Page 61 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)

  • Page 62: Semi-Automatic Sheet Feeder (Sasf) Operation

    FORM FEED. Since the paper bail is opened for SASF, there is less chance of jamming. 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)

  • Page 63: Maintenance & Disassembly

    Maintenance & Disassembly This chapter consists of the following sections: Disassembly / Assembly Procedures Adjustments Cleaning Lubrication 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)
  • Page 64 Page: 39 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.1.01 General Information This section lists the parts replacement, adjustment, cleaning, and lubrication procedures. Disassembly should not be performed unless absolutely necessary. NEVER perform disassembly on a malfunctioning unit until you have followed the failure analysis procedures ( ) in Section Four of this Service Handbook.
  • Page 65 When disassembling, follow the listed sequence. Failure to follow the correct sequence may result in damaged parts. Since screws, collars and other small parts are easily lost, they should be temporarily attached to the original positions. When handling circuit boards use extreme care. Integrated circuits (microprocessors, ROM, and RAM) can be destroyed by static electricity.

  • Page 66: Operator Panel Assembly

    Refer to the following to decode the serial number. Example Printer Serial Number: 401D0154693 Date Code 401 (4 = year. 01 = month) Revision Serial Number 0154693 Item Okidata Purpose / Function of Item LXMC 55041411 Main Control Board Board LXMC-...

  • Page 67: Transformer (Rev A & B)

    LXON 55075011 Operator Panel Board (with SSD) 50069603 Operator Panel Bezel 50107426 Operator Panel Bezel (with SSD) Transformer Item Okidata Purpose / Function of Item 56407503 Transformer - Microline 320 Volt XFRMR 56407502 Transformer - Microline 321 Volt XFRMR 56413201...
  • Page 68 Middle Cover - Microline 320 (with SSD) Chassis 50104601 Middle Cover - Microline 321 (with SSD) 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)
  • Page 69 This section contains the printer disassembly procedures. Only the removal procedures are explained. 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, applicable product, comment (RSPL, Option, Consumable), serial number revision level, and the cross-reference(s) to Appendix B are provided for each part.
  • Page 70 Page: 41 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.01 Preliminary Items 1) Press the AC switch (1 shows location) and power OFF the printer. 2) Remove the paper, if installed. 3) Detach the AC power cord (2). 4) Detach the interface cable (3), if installed.
  • Page 71 A B C D B.2.05 56624401 Kit: Parallel Interface Both Option A B C D 70000803 Plug'n'Play Accessory 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)
  • Page 72 Page: 42 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.02 Separator Assembly CAUTION: To avoid damaging the ribbon protector, slide the printhead towards the center of the printer before removing the separator assembly. Perform these procedures first: - 3.2.01 ( ) - Open the access cover (1).
  • Page 73 B.2.06 08 10 50069801 (Narrow) Separator: Assembly RSPL A B C D B.2.06 08 10 50069901 (Wide) 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)
  • Page 74 Page: 43 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.03 Printhead Assembly WARNING: The printhead will be hot immediately after printing. Allow the printhead to cool before handling. Perform these procedures first: - 3.2.01 ( ) - Open the access cover (1).
  • Page 75 A B C D B.2.03 04 05 50063802 (Assembly) Ribbon Both Consumable A B C D B.2.16 52102001 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)
  • Page 76 Page: 44 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.04 Upper Cover Assembly Perform these procedures first: - 3.2.01 ( ) Wrap a rubber band around the wire extensions of the interface connector. This pulls the extensions in and avoids damage when the cover is removed. (Notshown).
  • Page 77 CAUTION: Do NOT rotate the access cover past the vertical when removing it. The tab extensions can break. The Rev D middle cover is NOT compatible with the Rev A, B, and C middle cover.
  • Page 78 Before installing the cover, move the bail arm lever towards the back of the printer and move the release lever towards the front of the printer. After installation, verify that the cover is correctly seated in the front slots. The cover will warp if it is incorrectly installed.
  • Page 79 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)
  • Page 80 Page: 45 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.05 Operator Panel Assembly NOTE: The operator panel assembly and board for the Rev D units are NOT compatible with the Rev A, B, and C operator panel assembly and board.
  • Page 81 Part Item App. B Number Description Product Comment Revision Reference Panel: Operation Both RSPL A B C B.2.12 50069603 w/Frame (Assembly)
  • Page 82 B.2.12 55038602 (Operator PCB) PCB: LXON Both RSPL B.2.12 55075011 (Assembly) SSD Op Panel PCB 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)
  • Page 83 Page: 46 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.06 Control Board Rev A and B CAUTION: Check the contacts between the power interconnect module, the control board, and the power supply board (Rev A and B units ONLY). Clean the contacts if dirty.
  • Page 84 NOTE: When installing, verify that correct contacts are made at these points. - Guides (A and B) - Power Interconnect Module (C) - Linefeed Motor Interconnect Module (D) - Sensor Lever (E) - Printhead Cable Connector (F) The sensor lever must be positioned in the paper end sensor. If the lever is not correctly...
  • Page 85 Board) Lock: Board Screw Both RSPL A B C D B.2.03 04 05 50605501 (LXMC) 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)
  • Page 86 Page: 47 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly Control Board Rev C CAUTION: Check the contacts and connections of the control board. If good contact is not made at all connections and ground points, false diagnosis will occur.
  • Page 87 NOTE: When installing, verify that correct contacts are made at these points. - Guides (A and B) - Linefeed Motor Interconnect Module (C) - Sensor Lever (D)
  • Page 88 55041412 Lock: Board Screw Both RSPL A B C D B.2.03 04 05 50605501 (LXMC) 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)
  • Page 89 Page: 48 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly Control Board (Rev D) CAUTION: Check the contacts and connections of the control board. If good contact is not made at all connections and ground points, false diagnosis will occur.
  • Page 90 NOTE: When installing, verify that correct contacts are made at these points. - Guides (A and B) - Linefeed Motor Interconnect Module (C) - Sensor Lever (D) - Printhead Cable Connector (E) The sensor lever must be positioned in the paper end sensor. If the lever is not correctly positioned, the ALARM lamp will light and the unit will not automatically load paper or receive data.
  • Page 91 PCB: LXMR Both RSPL B.2.05` 55075111 (Assembly) SSD w/o ROMs (Control Board) 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)
  • Page 92 Page: 49 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.07 IC Card (A) Panel NOTE: The Rev D printers do not have this part. Perform these procedures first: - 3.2.01 ( ) - 3.2.04 ( ) - Insert a flat-blade screwdriver at the bottom of the chassis (1) and push up on the two claws (2) of the IC card (A) panel (3) to release the panel.
  • Page 93 Panel: IC Card (A) Both RSPL A B C B.2.06 08 53494901 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)
  • Page 94 Page: 50 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.08 Transformer Revs A and B NOTE: The transformer contains a built-in temperature fuse. Once the fuse opens, the transformer MUST be replaced. The Rev A, B, and C transformers are NOT compatible with the Rev D transformer.
  • Page 95 A B C B.2.03 04 56407901 RSPL Transformer: 220/240 Option A B C B.2.03 04 56407902 RSPL 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)

  • Page 96: Transformer Rev C

    Page: 51 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly Transformer Rev C NOTE: The transformer contains a built-in temperature fuse. Once the fuse opens, the transformer MUST be replaced. The Revs A, B, and C transformers are NOT compatible with the Rev D transformer.
  • Page 97 A B C B.2.03 04 56407901 RSPL Transformer: 220/240 Option A B C B.2.03 04 56407902 RSPL 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)

  • Page 98: Transformer Rev D

    Page: 52 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly Transformer Rev D NOTE: The transformer contains a built-in temperature fuse. Once the fuse opens, the transformer MUST be replaced. The Revs A, B, and C transformers are NOT compatible with the Rev D transformer.
  • Page 99 SSD 320 Option B.2.05 56413301 230/240V RSPL Transformer: SSD 321 Option B.2.05 56413302 230/240V RSPL 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)

  • Page 100: Filter Assembly

    Page: 53 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.09 Filter Assembly Perform these procedures first: - 3.2.01 ( ) - 3.2.04 ( ) - Working from the bottom of the chassis, push on and release the claw (1) of the filter assembly (2).
  • Page 101 Fuse: 1.5 amp 250 V Both Option A B C D B.2.03 04 05 56303402 (Filter Board) 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)

  • Page 102: Power Supply Board (Rev A & B)

    Page: 54 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.10 Power Supply Board Revs A and B NOTES: The Rev D printers do NOT have a power supply board. The control board contains circuitry to provide the power supply function.
  • Page 103 A B C B.2.03 04 56302502 Cable: Power Supply Both RSPL B.2.04 56616802 Nylon Conn 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)

  • Page 104: Power Supply Boards Rev C

    Page: 55 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly Power Supply Boards Rev C NOTES: The Rev D printers do NOT have a power supply board. The control board contains circuitry to provide the power supply function. Refer to Appendix A for more information on this board.
  • Page 105 A B C B.2.03 04 56302502 Cable: Power Supply Both RSPL B.2.04 56616802 Nylon Conn 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)

  • Page 106: Power Interconnect Module / Cable Guide (Rev A & B)

    Page: 56 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.11 Power Interconnect Module / Cable Guide Revs A and B NOTES: The Rev A and B printers do NOT have a cable guide. The Rev C and Rev D printers do NOT have a power interconnect module.
  • Page 107 Commen Revision Number Description Reference Module: Power Module: Both B.2.06 53328301 Interconnect Power Inter- connect 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)

  • Page 108: Power Interconnect Module / Cable Guide Rev C

    Page: 57 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly Power Interconnect Module / Cable Guide Rev C NOTES: The Rev A and B printers do NOT have a cable guide. The Rev C and Rev D printers do NOT have a power interconnect module.
  • Page 109 Guide: Cable RSPL B.2.08 10 51003801 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)

  • Page 110: Power Interconnect Module / Cable Guide (Rev D)

    Page: 58 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly Power Interconnect Module / Cable Guide (Rev D) NOTES: The Rev A and B printers do NOT have a cable guide. The Rev C and Rev D printers do NOT have a power interconnect module.
  • Page 111 Guide: Cable RSPL B.2.08 10 51003801 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)

  • Page 112: Indicator Assembly (Bail Bar Assembly)

    Page: 59 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.12 Indicator Assembly (Bail Bar Assembly) Perform these procedures first: - 3.2.01 ( ) - 3.2.04 ( ) - 3.2.05 ( ) - 3.2.06 ( ) - Use needle-nose pliers to remove the left bail arm spring (1).
  • Page 113 Part Item App. B Product Commen Revision Number Description Reference Spring: Bail Arm (L) Both RSPL A B C D B.2.06 08 10 50911801 Bail Arm (L) Both RSPL A B C D B.2.06 08 10 53489301 Spring: Bail Arm (R) Both RSPL A B C D...
  • Page 114 Indicator (Assembly) RSPL A B C D B.2.06 08 10 50061502 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)

  • Page 115: Head Cable Access Cover

    Page: 60 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.13 Head Cable Access Cover NOTE: Remove this cover to provide access when connecting the head cable to the control board. Perform these procedures first: - 3.2.01 ( ) - 3.2.04 ( ) - 3.2.06 ( )
  • Page 116 Cover: Head Cable Both RSPL A B C B.2.06 08 50062301 Access 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)

  • Page 117: Ribbon Drive Assembly

    Page: 61 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.14 Ribbon Drive Assembly CAUTION: When handling the head cable, do NOT bend the cable at sharp angles or you may damage it. Perform these procedures first: - 3.2.01 ( ) - 3.2.04 ( )
  • Page 118 A B C D B.2.13 56616302 (Flexible) Rubber: Contact Both RSPL A B C D B.2.13 51706501 Pressure 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)

  • Page 119: Space Motor Assembly

    Page: 62 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.15 Space Motor Assembly Perform these procedures first: - 3.2.01 ( ) - 3.2.03 ( ) - 3.2.04 ( ) - 3.2.14 ( ) - Note the position of the connector (1). During assembly, the connector's orientation is critical for correct printhead operation.
  • Page 120 A B C D B.2.13 56718601 Motor: Space Both RSPL A B C D B.2.13 56507202 (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)

  • Page 121: Carriage Frame Assembly

    Page: 63 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.16 Carriage Frame Assembly Perform these procedures first: - 3.2.01 ( ) - 3.2.03 ( ) - 3.2.04 ( ) - 3.2.14 ( ) - 3.2.15 ( ). - Detach the head clamp (1).
  • Page 122 NOTES: Installation - After installing the carriage shaft, check the printhead gap adjustment. Refer to Section 3.3 of this Service Handbook. Cleaning When cleaning, refer to Section 3.4 of this Service Handbook. Lubrication When lubricating, refer to Section 3.5 ( ) of this Service Handbook.
  • Page 123 A B C D B.2.13 53490401 (Assembly) Protector: Ribbon Both RSPL A B C D B.2.13 53056201 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)

  • Page 124: Space Rack

    Page: 64 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.17 Space Rack Perform these procedures first: - 3.2.01 ( ) - 3.2.04 ( ) - 3.2.14 ( ) - 3.2.15 ( ). - Remove the tension spring (1). - Release the claw (2) from the hole (3) in the chassis.
  • Page 125 NOTES: Installation - Fully seat the two guide pins (5). Cleaning - When cleaning, refer to Section 3.4 of this Service Handbook. CAUTION: Do NOT lubricate the space rack. Lubricating the space rack will attract dust. If enough dust accumulates on the space rack, printing problems will occur.
  • Page 126 B.2.06 08 10 53489402 Spring: Tension Both RSPL A B C D B.2.06 08 10 50911901 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)

  • Page 127: Guide Rail

    Page: 65 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.18 Guide Rail Perform these procedures first: - 3.2.01 ( ) - 3.2.04 ( ) - 3.2.14 ( ) - 3.2.15 ( ). - Pull the adjusting cam (1) out and rotate it to the horizontal position.
  • Page 128 NOTE: After installing the guide rail, check the printhead gap adjustment. Refer to Section 3.3 of this Service Handbook. Part Item App. B Product Commen Revision Number Description Reference Rail: Guide RSPL A B C D B.2.06 08 10 51002101 Rail: Guide RSPL A B C D...
  • Page 129 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)

  • Page 130: Platen Assembly

    Page: 66 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.19 Platen Assembly Perform these procedures first: - 3.2.01 ( ) - 3.2.02 ( ) - 3.2.04 ( ) - Push the release lever (1) to the rear of the printer.
  • Page 131 B.2.06 08 10 50061305 Platen: (Assembly) RSPL A B C D B.2.06 08 10 50061306 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)

  • Page 132: Line Feed Motor And Gear

    Page: 67 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.20 Line Feed Motor and Gear Line Feed Motor NOTES: Use care when performing this procedure. The plastic claws will break if too much pressure is applied. If the line feed motor gear breaks or becomes worn, it is not necessary to replace the entire line feed motor assembly.
  • Page 133 CAUTION: Installation If the line feed motor assembly is not correctly installed, excessive wear of the platen gears will occur. Verify that the tabs are not bent. If the tabs are bent, straighten them. The assembly will not seat if the tabs are bent. If the assembly is not seated correctly, the gears will not correctly align.
  • Page 134 Description Reference Motor: Line Feed Both RSPL A B C D B.2.07 09 11 56507003 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)
  • Page 135 Page: 68 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly Line Feed Motor Gear NOTES: If the line feed motor gear breaks or becomes worn, it is not necessary to replace the entire line feed motor assembly. The gear can be replaced without removing the line feed motor assembly.
  • Page 136 CAUTION: If the claws do not lock into the groove of the support shaft, the gear will "walk" off the shaft during use. Verify that the line feed motor gear and line feed motor assembly are correctly installed. Verify that the line feed motor gear and the platen gears are correctly aligned. Incorrect installation and alignment will cause line feed motor gear breakage and wearing.
  • Page 137 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)

  • Page 138: Line Feed Motor Interconnect Module

    Page: 69 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.21 Line Feed Motor Interconnect Module NOTE: Use care when performing this procedure. The plastic extension will break if too much pressure is applied. Perform these procedures first: - 3.2.01 ( ) - 3.2.02 ( )
  • Page 139 Module: LF Motor Both RSPL A B C D B.2.07 09 11 53328401 Interconnect 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)

  • Page 140: Reset Spring, Change Gear, And Idler Gear

    Page: 70 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.22 Reset Spring, Change Gear, and Idler Gear CAUTION: - Please read through this entire procedure before performing it. - Do NOT press against the vertical extension of the reset spring at any time during this procedure.
  • Page 141 Idler Gear Included Both A B C D B.2.07 09 11 51216001 in the Idler/Change Gear Kit 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)

  • Page 142: Release Lever

    Number Description Reference Lever: Release Both RSPL A B C D B.2.07 09 11 53489501 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)

  • Page 143: Paper Pressure Guide

    Page: 72 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.24 Paper Pressure Guide Perform these procedures first: - 3.2.01 ( ) - 3.2.02 ( ) - Use a straight-slot screwdriver to detach the coupling holes (1) of the support spring (2) from the projections (3) on the main chassis.
  • Page 144 NOTE: When installing the paper pressure guide, be sure to fit it into the projections (5) and guide plates (7) at the same time. The Microline 320 has five coupling holes and ten guide plates. The Microline 321 has seven coupling holes and thirteen guide plates. Part Item App.
  • Page 145 B.2.07 09 11 50911602 Pressure Spring: Support RSPL A B C D B.2.07 09 11 50913901 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)

  • Page 146: Pressure Roller Assembly

    Page: 73 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.25 Pressure Roller Assembly Perform these procedures first: - 3.2.01 ( ) - 3.2.02 ( ) - 3.2.04 ( ) - 3.2.22 ( ) - 3.2.23 ( ) - Remove the paper chute (1).
  • Page 147 B.2.07 09 11 50061701 (Assembly) Link: Release Both RSPL A B C D B.2.07 09 11 53489601 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)

  • Page 148: Tractor Assembly

    Page: 74 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.26 Tractor Assembly NOTE: Horizontal movement of the left tractor is restricted by a stopper on the lower cover. Perform these procedures first: - 3.2.01 ( ) - 3.2.02 ( ) - 3.2.04 ( )
  • Page 149 NOTES: Installation The tractors must be synchronized. The pins (14) on the left and right tractors must be aligned when installed. Also, verify that the guide holes (15) in the tractor drive gears are facing the same direction. The left tractor assembly must be positioned to the left (line feed motor side) of the plastic tab and ground plate.
  • Page 150 A B C D B.2.14 51109602 Sheet Guide Both RSPL A B C D B.2.14 51004901 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)

  • Page 151: Sensor Lever

    Page: 75 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.27 Sensor Lever Perform these procedures first: - 3.2.01 ( ) - 3.2.02 ( ) - 3.2.04 ( ) - 3.2.05 ( ) - 3.2.06 ( ) - 3.2.20 ( ) - 3.2.22 ( )
  • Page 152 Commen Revision Reference Lever: Sensor Both RSPL A B C D B.2.07 09 11 53489001 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)

  • Page 153: Paper End (B) Lever

    Page: 76 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.2.28 Paper End (B) Lever NOTE: The paper end lever guide is accessed from the bottom of the printer. Perform these procedures first: - 3.2.01 ( ) - 3.2.02 ( ) - 3.2.04 ( )
  • Page 154 Part Item App. B Product Commen Revision Number Description Reference Lever: Paper End (B) RSPL A B C D B.2.07 09 11 53488901 Lever: Paper End (B) RSPL A B C D B.2.07 09 11 53488902 Cover: Sensor Both RSPL A B C D B.2.07 09 11 53489101...
  • Page 155 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)

  • Page 156: Main Chassis Assembly

    (Assembly) Chassis: Main RSPL B.2.11 50104501 (Assembly) SSD Chassis: Main RSPL B.2.11 50104601 (Assembly) SSD 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)

  • Page 157: Adjustments

    Failure to perform these procedures may result in unnecessary service calls. 3.3.01 Printhead Gap Adjustment . 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)
  • Page 158 Page: 79 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly 3.3.01 Printhead Gap Adjustment Before performing this adjustment, always verify that the printhead is properly installed. The printhead gap should measure: Rev A, B, and C: 0.016 inch, + / - 0.002 inch Rev D: 0.018 inch, + / - 0.002 inch...
  • Page 159 3) Place the paper bail bar in the OPEN position. 4) Set the adjusting lever to Position 1. 5) Place the adjust cam in the vertical position. 6) Slide the carriage assembly to the left (line feed motor) side of the platen. 7) Use a feeler gauge to check the printhead gap.
  • Page 160 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)

  • Page 161: Cleaning

    Page: 80 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly CLEANING 3.4.01 General Information An accumulation of paper dust is the most frequent cause of print quality problems in a dot matrix printer. Small pieces of paper can cause paper jams. A dirty platen will smudge paper. It is important to clean the printer regularly, paying particular attention to the printhead area and paper paths.
  • Page 162 Platen Cloth Wipe the surface of 3.2.29 Platen Cleaner the platen with platen cleaner. 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)

  • Page 163: Lubrication

    Page: 81 Service Guide ML320/ML321 Chapter 3 Maintenance & Disassembly LUBRICATION 3.5.01 General Information If the lubrication procedures are not performed properly, the printer will require more frequent cleaning. Excessive lubricant attracts dust and accumulations build up quickly. An accumulation of paper dust is the most frequent cause of print quality problems in a dot matrix printer.
  • Page 164 Machine Oil Small Turn the Space Motor 3.2.15 assembly over Assembly. to access the Contact point. Do not between the over-lubricate. space motor Do NOT place assembly gear lubricant directly and the space on the space rack. rack. Machine Oil Small Place a small Carriage Shaft...
  • Page 165 Electrical Contacts and Connections Space Rack Carriage Drive Belt Head Cable Microswitches Pressure Rollers (on Bail Bar) 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)

  • Page 166: Failure & Repair Analysis

    If you encounter a situation that is not addressed by the documentation in this kit, please report the problem to Okidata. Send your report to the Okidata Technical Training Group. Refer to the Service Center Reference Guide for information on contacting Okidata.
  • Page 167 Refer to the following to decode the serial number. Example Printer Serial Number: 401D0154693 Date Code 401 (4 = year. 01 = month) Revision Serial Number 0154693 Item Okidata Purpose / Function of Item LXMC 55041411 Main Control Board Board LXMC-...
  • Page 168 Power supply function included on the Main Control Board Operator Panel Assembly Item Okidata Purpose / Function of Item LXSP-2 55038602 Operator Panel Board LXON 55075011 Operator Panel Board (with SSD) 50069603 Operator Panel Bezel 50107426 Operator Panel Bezel (with SSD)
  • Page 169 Cable Item Okidata Purpose / Function of Item Cable 56616802 Connects power supply board to main board Cable Guide Item Okidata Purpose / Function of Item Cable 51003801 Holds cable in place Guide Covers Item Okidata Purpose / Function of Item...
  • Page 170 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)

  • Page 171: Troubleshooting Tips

    Check the contacts and connections of the control board. If good contact is not made at all connections and ground points, false diagnosis will occur. 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)

  • Page 172: Common Problems

    Page: 84 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.4.02 Common Problems Nothing happens when the printer is powered ON. Make sure the printer is plugged in. Check the power cord connection to the printer and the outlet.
  • Page 173 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)

  • Page 174: Fault Alarms

    Page: 85 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.5 FAULT ALARMS 4.5.01 General Information The operator panel is used to display printer modes and error conditions. The table below shows the operator panel display and the mode or condition it matches.
  • Page 175 Printer Modes - Rev D ALAR SELECT MENU Printer Status Description Lamp Lamp Mode Lamp Status Status Status Normal On-Line The printer is ready to receive data Operation and to print. Normal Hex Dump The printer is in Hex Dump Mode. Operation Refer to Section 4.7( ) Normal...
  • Page 176 Blinking External RAM Error Replace the control board Blinking Spacing<R>Error Go to RAP 02 ( ) Blinking Serial Interface Replace the Serial Error Interface Board Fault Alarm Conditions - Rev D ALARM SELEC Error Action Lamp TLamp Conditio Lamp Status Status Statu Curre...
  • Page 177 Check the contacts and connections of the control board. If good contact is not made at all connections and ground points, false diagnosis will occur. 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)

  • Page 178: Repair Analysis Procedures - Using The Raps

    If the RAPs do not lead you to the cause of a problem, please report this to 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)

  • Page 179: Troubleshooting Cautions

    Malfunction of Operator Panel Switch(es)......( ) Parallel Interface Does Not Receive Data......( Serial Interface Does Not 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)
  • Page 180 Check the contacts and connections of the control board. If good contact is not made at all connections and ground points, false diagnosis will occur. 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)

  • Page 181: Rap 01A:operator Panel Lamps Do Not Light - Rev A, B

    Page: 89 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis RAP 01A:Operator Panel Lamps Do Not Light - Rev A, B, and C START Are the AC cables connected correctly? Connect the AC cables correctly. Is the problem resolved? End of procedure.
  • Page 182 Replace the power supply board. Is the problem resolved? End of procedure. Contact Technical Support. 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)

  • Page 183: Rap 01B:operator Panel Lamps Do Not Light - Rev D

    Page: 90 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis RAP 01B:Operator Panel Lamps Do Not Light - Rev D START Are the AC cables connected correctly? Connect the AC cables correctly. Is the problem resolved? End of procedure.
  • Page 184 Go to the next step listed below. Replace the transformer. Is the problem resolved? End of procedure. Contact Technical Support. 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)

  • Page 185: Rap 02A:abnormal Spacing - Rev A, B, And C

    Page: 91 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis RAP 02A:Abnormal Spacing - Rev A, B, and C START Check the movement (Steps A and B) of the carriage assembly. Does the assembly vibrate back and forth in the same location or does it move sharply to the left or right end of the carriage shaft? Replace the control board.
  • Page 186 + 40 vdc Take the voltage reading between Pin 1 and Pin 5 of CN2 on the power supply board. Replace the control board. End of procedure. Go to D Go to D Are the power supply board and the control board connected properly? Replace the power supply board.
  • Page 187 End of procedure. Contact Technical Support. 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)

  • Page 188: Rap 02B:abnormal Spacing - Rev D

    Page: 92 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis RAP 02B:Abnormal Spacing - Rev D START Check the movement (Steps A and B) of the carriage assembly. Does the assembly vibrate back and forth in the same location or does it move sharply to the left or right end of the carriage shaft? Replace the control board.
  • Page 189 Replace the control board. Is the problem resolved? End of procedure. Replace the space motor. Is the problem resolved? End of procedure. Contact Technical Support. Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business...
  • Page 190 Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

  • Page 191: Rap 03:Wrong Or Missing Characters / Dots On Output

    Page: 93 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis RAP 03:Wrong or Missing Characters / Dots on Output START Is the head cable correctly inserted into CN2 of the control board? Correctly insert the cable. Is the problem resolved? End of procedure.
  • Page 192 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)

  • Page 193: Rap 04:Line Feed Problems

    Page: 94 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis RAP 04:Line Feed Problems NOTE: Before performing this RAP, check the following. 1. Is the head gap correctly set for the type of paper being used? 2. Remove the printhead. Examine the pins. Do they appear damaged? If so, replace the printhead.
  • Page 194 Contact Technical Support. Correct the contact. Is the problem resolved? End of procedure. Contact Technical Support. 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)

  • Page 195: Rap 05:Malfunction Of Operator Panel Switch(Es)

    End of procedure. Replace the control board. Is the problem resolved? End of procedure. Contact Technical Support. 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)

  • Page 196: Rap 06:Parallel Interface Does Not Receive Data

    End of procedure. Replace the control board. Is the problem resolved? End of procedure. Call Technical Support. 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)

  • Page 197: Rap 07:Serial Interface Does Not Receive Data

    Page: 97 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis RAP 07:Serial Interface Does Not Receive Data NOTE: Before performing the procedures of this RAP, make sure that the correct protocols are selected. Print the Menu to check protocol settings. For information on printing the Menu, refer to Section 4.10...
  • Page 198 Is the problem resolved? End of procedure. Contact Technical Support. 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)

  • Page 199: Hexadecimal Dump - Procedure

    65 63 69 6D 61 6C 20 64 75 6D 70 2E 0D 0A This is an example of a hexadecimal dump... 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)

  • Page 200: Resistance / Service Checks - Index To Charts

    Rev D ......( ) Control Board Rev A, B, C, D ... ( ) 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)

  • Page 201: Interconnect Diagrams (Rev A & B)

    Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.8.02 Interconnect Diagrams (Rev A & B) 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)
  • Page 202 Page: 101 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis Interconnect Diagrams (Rev C) 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)

  • Page 203: Interconnect Diagrams (Rev C)

    Page: 102 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis Interconnect Diagrams (Rev D) 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)

  • Page 204: Printhead

    Page: 103 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.8.03 Printhead 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)

  • Page 205: Space Motor

    Page: 104 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.8.04 Space Motor 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)

  • Page 206: Line Feed Motor

    Page: 105 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.8.05 Line Feed Motor 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)

  • Page 207: Operator Panel Board (Rev A, B, & C)

    Chapter 4 Failure & Repair Analysis 4.8.06 Operator Panel Board (Rev A, B, & C) 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)

  • Page 208: Operator Panel Board (Rev D)

    Page: 107 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis Operator Panel Board (Rev D) 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)

  • Page 209: Control Board (Rev A - D)

    Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.8.07 Control Board (Rev A - D) 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)

  • Page 210: Printer Tests

    The Serial Interface Loopback Test is used to test proper operation of the Serial Interface Board. 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)
  • Page 211 Page: 110 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.9.02 Rolling ASCII Print Test General Information The Rolling ASCII Print Test produces a continuous printout of all 96 ASCII characters in a rolling pattern. The type style set in the printer menu will be utilized.
  • Page 212 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)
  • Page 213 Page: 111 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.9.03 Font Sample Test General Information This test will print samples of these fonts. LQ - ROMAN 10 cpi LQ - SWISS 10 cpi LQ - COURIER 10 cpi,12 cpi, 15 cpi, 17.1 cpi, 20 cpi...
  • Page 214 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)
  • Page 215 Page: 112 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.9.04 Serial Interface Loopback Test NOTE: Attach a serial loopback test connector to the printer's serial port to run this test. General Information The Serial Interface Loopback Test checks the operation of the serial interface board.
  • Page 216 Press MODE to record the changes and return to Print Mode. The MENU lamp will go out and the SEL lamp will light. Serial Loopback Plug Diagram 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)

  • Page 217: Menu Operation

    Page: 113 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.10 MENU OPERATION 4.10.01 General Information The end user can customize printer features by changing menu settings. These settings are automatically activated when the printer is powered ON. Selections made in Menu Mode are stored in the printer's permanent memory. They will stay in effect, even when the printer is powered OFF.
  • Page 218 Power OFF the printer. Press and hold the PARK and TOF/QUIET switches while powering ON 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)

  • Page 219: Top Of Form

    Page: 114 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.11 TOP OF FORM 4.11.01 General Information Top of Form sets the print start position for the printer. It is adjustable in increments of 1/144 of an inch. The amount of adjustment is limited to avoid paper jams.
  • Page 220 NOTE: The bail must hold the paper in place. If the top of the page is set below the bail, the paper will catch on the bail and a paper jam will occur. 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)

  • Page 221: Paper Park

    Page: 115 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.12 PAPER PARK 4.12.01 General Information Paper Park allows single sheet paper to be printed without removing continuous feed paper from the printer. 4.12.02 Procedure Remove any printed pages.
  • Page 222 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)

  • Page 223: Forms Tear Off

    Page: 116 Service Guide ML320/ML321 Chapter 4 Failure & Repair Analysis 4.13 FORMS TEAR OFF 4.13.01 General Information This feature allows a printed page (rear feed, continuous form) to be torn off without wasting paper or adjusting the printer. Forms Tear Off advances the paper from the initial printing position to the tear off position.
  • Page 224 Press and hold TOF/Quiet. The paper will retract to the initial print position. Release TOF/Quiet. The paper will advance to the forms tear off position. 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)

  • Page 225: Board Diagrams

    Page: 117 Service Guide ML320/ML321 Chapter A Reference Charts BOARD DIAGRAMS A.1.01 General Information This section describes the characteristics of the printed circuit boards used in the Microline 320 and Microline 321 printers. The following areas are covered in each section.
  • Page 226 Example Printer Serial Number: 401D0154693 Date Code 401 (4 = year. 01 = month) Revision Serial Number 0154693 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)

  • Page 227: Index To Charts (A, B, C, D)

    Page: 118 Service Guide ML320/ML321 Chapter A Reference Charts INDEX TO CHARTS Rev A and B Description Board Designation - Rev Section Control Board LXMC A and B A.2.01 ( ) Power Supply PAII-2 A and B A.2.04 ( )
  • Page 228 RS232-C Serial LXHI A, B, C, and D A.2.09 ( ) Interface Rev D Description Board Designation - Rev Section Control Board LXMR A.2.03 ( ) Filter Assembly A, B, C, and D A.2.06 ( ) Operator Panel LXSP A.2.08 ( ) RS232-C Serial LXHI A, B, C, and D...
  • Page 229 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)

  • Page 230: Control Board (Lxmc) - Rev A And B

    Page: 119 Service Guide ML320/ML321 Chapter A Reference Charts A.2.01 Control Board (LXMC) - Rev A and B Function The control board contains the microprocessor and its peripheral circuits. The drive circuits, paper end sensor, and the interface connector are on this board. A 3.25 V lithium battery is on this board.
  • Page 231 CN6to power supply CN7to line feed motor Diagram - PCB Version Numbers 2 - 7 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)

  • Page 232: Control Board (Lxmc-3) - Rev C

    Page: 120 Service Guide ML320/ML321 Chapter A Reference Charts A.2.02 Control Board (LXMC-3) - Rev C Function The control board contains the microprocessor and its peripheral circuits. The drive circuits, paper end sensor, and the interface connector are on this board. A 3.25 V lithium battery is on this board.
  • Page 233 R5+ 38 vdc SP3 B Side+ 5 vdc MTDV Pin 3 + 8 vdc Notes The LXMC-3 Board has gone through a modification. The older version of the board accepted a 28 pin EPROM at the Q13 socket location. The newer version of the board accepts a 32 pin masked ROM.
  • Page 234 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)

  • Page 235: Control Board (Lxmr) - Rev D

    Page: 121 Service Guide ML320/ML321 Chapter A Reference Charts A.2.03 Control Board (LXMR) - Rev D Function The control board contains the microprocessor and its peripheral circuits. The drive circuits, paper end sensor, and the interface connector are on this board. It also contains the components needed for regulating DC voltage and those needed to convert AC voltage to DC voltage.
  • Page 236 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)

  • Page 237: Power Supply (Paii-2) - Rev A And B

    Page: 122 Service Guide ML320/ML321 Chapter A Reference Charts A.2.04 Power Supply (PAII-2) - Rev A and B Function This board converts and regulates the AC voltage input to DC voltage and supplies the DC voltage to the control board.
  • Page 238 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)

  • Page 239: Power Supply (Suii-2) - Rev C

    Page: 123 Service Guide ML320/ML321 Chapter A Reference Charts A.2.05 Power Supply (SUII-2) - Rev C Function This board converts and regulates the AC voltage input to DC voltage and supplies the DC voltage to the control board. Firmware NONE Fuses F1 2.0 amp / 250 VAC...
  • Page 240 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)

  • Page 241: A.2.06 Filter Assembly - Rev A, B, C, And D

    Page: 124 Service Guide ML320/ML321 Chapter A Reference Charts A.2.06 Filter Assembly - Rev A, B, C, and D Function This assembly is a protective feature. It also filters out unwanted line noise. Its fuse will open when a fault occurs in the printhead drive circuit, the space motor drive circuit, or any of their peripheral circuits.
  • Page 242 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)

  • Page 243: A.2.07 Operator Panel (Lxsp) - Rev A, B, And C

    CHARACTER PITCH Displays SELECT ALARM 10 cpi POWER 20 cpi Not used Not used 12 cpi MENU PROP TOF / QUIET 17 cpi Test Points NONE Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business...
  • Page 244 Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)

  • Page 245: A.2.08 Operator Panel (Lxon) - Rev D

    12 cpi Not used PROP Not used Not used 10 cpi 17 cpi Test Points NONE 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)

  • Page 246: A.2.09 Rs232-C Serial Interface (Lxhi) - Rev A, B, C, And D

    Version 2SP1 Side BCPU Masked ROM is utilized Sensors NONE Switches NONE Test Points NONE 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)
  • Page 247 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.

  • Page 248: B.1.02 Definitions Of Terms

    Various documents are available from Okidata. 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. This part is found ONLY in the Microline 320 printer.

  • Page 249: B.2 Index To Illustrated Parts Breakdown Charts

    Page: 130 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2 Index to Illustrated Parts Breakdown Charts Below is an index to the illustrated parts breakdown charts. Description Section Covers - Rev A, B, and C B.2.01 ..( ) Covers - Rev D B.2.02...
  • Page 250 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)

  • Page 251: B.2.01 Covers - Rev A, B, And C

    Page: 131 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.01 Covers - Rev A, B, and C Part numbers are subject to change. Okidata PN / Description Model Comments Disassembly Serial #. OKI-J PN Section Rev Level 53488302 Cover: Middle (ML320)
  • Page 252 1PA4016-6569 (Assembly) 50061001 Separator: Sheet RSPL A B C D 3.2.04 ( ) 1PA4016-6570 (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)

  • Page 253: B.2.02 Covers - Rev D

    Page: 132 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.02 Covers - Rev D Part numbers are subject to change. Okidata PN / Description Model Comment Disassembly Serial #. OKI-J PN Section Rev Level 53070701 Cover: Middle (SSD) RSPL 3.2.04 ( )
  • Page 254 1PA4016-6569 (Assembly) 50061001 Separator: Sheet RSPL A B C D 3.2.04 ( ) 1PA4016-6570 (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)

  • Page 255: B.2.03 Electrical Components - Rev A And B

    Page: 133 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.03 Electrical Components - Rev A and B Okidata PN / Description Model Comment Disassemb Serial #. OKI-J PN ly Section Rev Level 56609701 Cord: AC 120 V Both RSPL A B C D 3.2.01 ( )
  • Page 256 56616501 Cord: AC 240V 320/3 Option A B C D 3.2.01 ( ) 3YS4011-1192 50063802 Printhead: (Assembly) Both RSPL A B C D 3.2.03 ( ) 4YA4025-1401 51901101 Knob: Platen Both RSPL A B C D 3.2.04 ( ) 3PP4025-2871 50704301 Clamp: PCB Both...
  • Page 257 (PAII or SUII Board) 56302502 Fuse: 250V 1A Both Option A B C 3.2.10 ( ) FP-21093-1 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)

  • Page 258: B.2.04 Electrical Components - Rev C

    Page: 134 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.04 Electrical Components - Rev C Part numbers are subject to change. Okidata PN / Description Model Comment Disassemb Serial #. OKI-J PN ly Section Rev Level 56609701 Cord: AC 120 V...
  • Page 259 56624101 Cord: AC (220 V) (ML Both Option A B C D 3.2.01 ( ) 3YS4011-1265 Series) RSPL 56616501 Cord: AC 240V 320/3 Option A B C D 3.2.01 ( ) 3YS4011-1192 50063802 Printhead: (Assembly) Both RSPL A B C D 3.2.03 ( ) 4YA4025-1401 51901101...
  • Page 260 (PAII or SUII Board) 56302502 Fuse: 250V 1A Both Option A B C 3.2.10 ( ) FP-21093-1 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)

  • Page 261: B.2.05 Electrical Components - Rev D

    Page: 135 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.05 Electrical Components - Rev D Part numbers are subject to change. Okidata PN / Description Model Comment Disassemb Serial #. OKI-J PN ly Section Level 56609701 Cord: AC 120 V...
  • Page 262 4YB4049-7061 (ML320) 56413202 Transformer: 120 V SSD RSPL 3.2.08 ( ) 4YB4049-7061 (ML321) 56413301 Transformer: 230/240V Option 3.2.08 ( ) 4YB4049-7062 SSD (ML320) RSPL 56413302 Transformer: 230/240V Option 3.2.08 ( ) 4YB4049-7062 SSD (ML321) RSPL 55503103 Filter: (Assembly) AC Both...
  • Page 263 Fuse: 1.5 amp 250 V Both Option A B C D 3.2.09 ( ) FP-21107-1 (Filter Board) 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)
  • Page 264 Page: 136 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.06 Printer Mechanism - Rev A and B (1 of 2) Part numbers are subject to change. Okidata PN / Description Model Comment Disassemb Serial #. OKI-J PN ly Section...
  • Page 265 50069901 Separator: Assembly RSPL A B C D 3.2.02 ( ) 3PA4025-2978 (Wide) 53494901 Panel: IC Card (A) Both RSPL A B C 3.2.07 ( ) 2PP4025-2952 53328301 Modul e : Power Both 3.2.11 ( ) 3PB4025-2911 Interconnect 50061501 Indicator (Assembly) RSPL A B C D 3.2.12 ( )
  • Page 266 3.2.19 ( ) 3PA4025-2811 50061306 Platen: (Assembly) RSPL 3.2.19 ( ) A B C D 3PA4025-2811 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)
  • Page 267 Page: 137 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.07 Printer Mechanism - Rev A and B (2 of 2) Part numbers are subject to change. Okidata PN / Description Model Comment Disassem Serial #. OKI-J PN Rev Level...
  • Page 268 56507003 Motor: Line Feed Both RSPL A B C D 3.2.20 ( 3PB4025-2844 53328401 Module: Motor Both RSPL A B C D 3.2.21 ( 3PP4025-2874 Interconnect 58227501 Kit: Idler/Change Gear Both RSPL<R> A B C D 3.2.22 ( (ML300) I n c . and 41 51216001 Idler Gear...
  • Page 269 (Assembly) 50061201 Chassi s : Mai n RSPL A B C 3.2.29 ( 3PA4025-2902 (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)
  • Page 270 Page: 138 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.08 Printer Mechanism - Rev C (1 of 2) Part numbers are subject to change. Okidata PN / Description Model Comment Disasse Serial #. OKI-J PN mbly Section Level 50069801...
  • Page 271 50069901 Separator: Assembly RSPL 3.2.02( A B C D 3PA4025-2978 (Wide) 53494901 Panel: IC Card (A) Both RSPL 3.2.07( A B C 2PP4025-2952 51003801 Guide: Cable RSPL 3.2.11( C D PCB 4PB4025-3180 V e r and after 50061501 Indicator (Assembly) RSPL 3.2.12( A B C D...
  • Page 272 A B C D 3PA4025-2811 50061306 Platen: (Assembly) RSPL 3.2.19( A B C D 3PA4025-2811 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)
  • Page 273 Page: 139 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.09 Printer Mechanism - Rev C (2 of 2) Part numbers are subject to change. Okidata PN / Description Model Comment Disasse Serial #. OKI-J PN mbly Rev Level Section...
  • Page 274 56507003 Motor: Line Feed Both RSPL 3.2.20 A B C D 3PB4025-2844 53328401 Module: Motor Both RSPL 3.2.21 A B C D 3PP4025-2874 Interconnect 58227501 Kit: Idler/Change Gear Both RSPL<R>I 3.2.22 A B C D (ML300) nc. 39 and 51216001 Idler Gear Both 3.2.22...
  • Page 275 3PA4025-2802 (Assembly) 50061201 Chassi s : Mai n RSPL 3.2.29 A B C 3PA4025-2902 (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)
  • Page 276 Page: 140 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.10 Printer Mechanism - Rev D (1 of 2) Part numbers are subject to change. Okidata PN / Description Model Comment Disasse Serial #. OKI-J PN mbly Rev Level Section...
  • Page 277 50069901 Separator: Assembly RSPL 3.2.02 A B C D 3PA4025-2978 (Wide) 51003801 Guide: Cable RSPL 3.2.11 C D PCB 4PB4025-3180 V e r and after 50061501 Indicator (Assembly) RSPL 3.2.12 A B C D 4PA4025-2838 50061502 Indicator (Assembly) RSPL 3.2.12 A B C D 4PA4025-2838 53489201...
  • Page 278 A B C D 3PA4025-2811 50061306 Platen: (Assembly) RSPL 3.2.19 A B C D 3PA4025-2811 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)
  • Page 279 Page: 141 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.11 Printer Mechanism - Rev D (2 of 2) Part numbers are subject to change. Okidata PN / Description Model Comment Disasse Serial #. OKI-J PN mbly Section Level 51219001...
  • Page 280 56507003 Motor: Line Feed Both RSPL 3.2.20 A B C D 3PB4025-2844 53328401 Module: Motor Both RSPL 3.2.21 A B C D 3PP4025-2874 Interconnect 58227501 Kit: Idler/Change Gear Both RSPL<R> 3.2.22 A B C D (ML300) I n c . and 41 51216001 Idler Gear...
  • Page 281 (Assembly) SSD ML320 50104601 Chassi s : Mai n RSPL 3.2.29 3PA4025-3832 (Assembly) SSD ML321 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)
  • Page 282 Page: 142 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.12 Operator Panel - Rev A, B, C, and D Part numbers are subject to change. Okidata PN / Description Model Comment Disasse Serial #. OKI-J PN mbly Section Level...
  • Page 283 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)
  • Page 284 Page: 143 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.13 Carriage Assembly - Rev A, B, C, and D Part numbers are subject to change. Okidata PN / Description Model Comment Disassemb Serial #. OKI-J PN ly Section Level...
  • Page 285 3.2.16 ( ) 4PP4025-1048 53056201 Protector: Ribbon Both RSPL A B C D 3.2.16 ( ) 3PP4025-2836 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)

  • Page 286: B.2.14 Tractor Assembly - Rev A, B, C, And D

    Page: 144 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.14 Tractor Assembly - Rev A, B, C, and D Part numbers are subject to change. Okidata PN / Description Model Comment Disassembl Serial #. OKI-J PN y Section Rev Level...
  • Page 287 3.2.26 ( ) 4PP4025-2865 51004901 Sheet Guide Both RSPL A B C D 3.2.26 ( ) 3PP4025-2927 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)

  • Page 288: B.2.15 Options - Rev A, B, C, And D

    Page: 145 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.15 Options - Rev A, B, C, and D Part numbers are subject to change. Okidata PN / Description Model Comment Disassem Serial #. OKI-J PN Rev Level Section 53493201...
  • Page 289 A B C D 4PP4025-2887 RSPL Sheet Guide Both Option A B C D 4PP4025-2653 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)

  • Page 290: B.2.16 Consumables - Rev A, B, C, And D

    OKI-J PN Section Rev Level 52102001 Ribbon Both Consuma A B C D 3.2.03 ( ) 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)

  • Page 291: B.2.17 Packaging - Rev A, B, C, And D

    Page: 147 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.17 Packaging - Rev A, B, C, and D Part numbers are subject to change. Okidata PN / Description Model Comment Disassembly Serial #. OKI-J PN Section Rev Level 53496401...
  • Page 292 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)

  • Page 293: B.2.18 Documentation - Rev A, B, C, And D

    Page: 148 Service Guide ML320/ML321 Chapter B Illustrated Parts Listing B.2.18 Documentation - Rev A, B, C, and D Part numbers are subject to change. Okidata PN / Description Model Comment Disassem Serial #. OKI-J PN Section Level 58302601 Product Update...
  • Page 294 Document A B C D Marketing Literature Both Document A B C D Order Form 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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