LA100 Series Pocket Service Guide

Company:Digital Equipment Corporation
Part:EK-LA100-PS-002
Date:1984-12
Keywords:terminal printer letterwriter letterprinter
Supersedes:

Table of Contents

  • 1 Troubleshooting and Testing
    • 1.1 General
    • 1.2 Troubleshooting the LA100
    • 1.3 Power-Up Self-Test
    • 1.4 Printer Self-Tests
      • 1.4.1 Status Message
      • 1.4.2 Character Pattern Test
      • 1.4.3 Single Character Test
      • 1.4.4 Horizontal Registration Test
      • 1.4.5 Nonprinting Test
      • 1.4.6 Performing Printer Tests
        • 1.4.6.1 Performing Letterprinter 100 Printer Tests
        • 1.4.6.2 Performing Letterwriter 100 Printer Tests
    • 1.5 Loopback Test
      • 1.5.1 Performing Loopback Test
        • 1.5.1.1 Performing Letterprinter 100 Loopback Test
        • 1.5.1.2 Performing Letterwriter 100 Loopback Test (Test 1)
        • 1.5.1.3 Performing Letterwriter 100 Loopback Test (Test 2)
  • 2 Removing and Replacing FRUs
    • 2.1 General
    • 2.2 Printhead Assembly
    • 2.3 Printer Housing Cover
      • 2.3.1 Printer Housing Cover Removal
      • 2.3.2 Printer Housing Cover Replacement
    • 2.4 Platen Clutch/Gear Assembly
      • 2.4.1 Platen Clutch/Gear Assembly Removal
      • 2.4.2 Platen Clutch/Gear Assembly Replacement
    • 2.5 Bail Bar Assembly
    • 2.6 Friction Assembly
    • 2.7 Power Supply Assembly
    • 2.8 Keyboard/Operator Control Panel Assembly
      • 2.8.1 Keyboard/Operator Control Panel Bezel Assembly
      • 2.8.2 Keyboard/Operator Control Panel Assembly
    • 2.9 LA100 Logic Board
    • 2.10 Printer Mechanism
    • 2.11 Antibacklash Gear
    • 2.12 Line Feed Motor Assembly
    • 2.13 Servo Motor and Encoder Assembly
    • 2.14 Pulley/Idler Assembly
    • 2.15 Timing Belt
    • 2.16 Ribbon Drive Cables
    • 2.17 Carriage Assembly
    • 2.18 Paper Out Detection Switch
    • 2.19 Printhead Cable Assembly
    • 2.20 Paper Low Jack Cable
  • 3 Logic Board Configurations
    • 3.1 General
    • 3.2 Jumper Selectable Features
    • 3.3 EIA Circuit Jumpers
    • 3.4 Dot Pattern Set
      • 3.4.1 ROM Removal
      • 3.4.2 ROM Replacement
    • 3.5 Switch Selectable Features
    • 3.6 Multiple Font Option
  • 4 Option Servicing
    • 4.1 General
    • 4.2 LAX34-RL Roll Paper Holder Option
      • 4.2.1 Checkout Procedure
      • 4.2.2 Roll Paper Holder Removal and Replacement
    • 4.3 LA10X-EL Tractor Option
      • 4.3.1 Checkout Procedure
      • 4.3.2 Tractor Assembly Removal and Replacement
    • 4.4 LAX34-LL Paper Low Detection Option
      • 4.4.1 Checkout Procedure
      • 4.4.2 Paper Low Detection Option Removal and Replacement
        • 4.4.2.1 Paper Low Switch Removal and Replacement
        • 4.4.2.2 Paper Low Jack Cable Replacement
    • 4.5 LAX34-CL 20 mA Current Loop Interface Option
      • 4.5.1 Checkout Procedure
      • 4.5.2 20 mA Current Loop Interface Removal and Replacement
    • 4.6 LAX34-KL Numeric Keypad Option
      • 4.6.1 Checkout Procedure
      • 4.6.2 Numeric Keypad Removal and Replacement
    • 4.7 LA10X-FL Multiple Font Option
      • 4.7.1 Checkout Procedure
      • 4.7.2 Multiple Font Option Removal and Replacement
        • 4.7.2.1 Buffer Integrated Circuit (IC) Removal
        • 4.7.2.2 Buffer IC Replacement
        • 4.7.2.3 Cartridge Receptacle Removal and Replacement
    • 4.8 LA10X-SF Automatic Sheet Feeder
      • 4.8.1 Checkout Procedure
      • 4.8.2 Sheet Feeder Removal and Replacement
      • 4.8.3 Mounting Bracket Removal and Replacement
      • 4.8.4 Paper Select Knob Removal and Replacement
        • 4.8.4.1 Paper Select Knob Removal
        • 4.8.4.2 Paper Select Knob Replacement
      • 4.8.5 Side Covers Removal and Replacement
      • 4.8.6 Sheet Feeder Logic Board Removal and Replacement
      • 4.8.7 Sheet Feeder Stepper Motor Removal and Replacement
      • 4.8.8 Sheet Feeder Clutch Removal and Replacement
      • 4.8.9 Paper Advance Rollers
      • 4.8.10 Pinch Roller Removal and Replacement
      • 4.8.11 Front Cover, Plastic Strip, and Metal Plate Removal and Replacement
      • 4.8.12 Hold Down Latch and Spring Removal and Replacement
      • 4.8.13 Timing Belt and Idler Gear Removal and Replacement
      • 4.8.14 Drive Control (DRC) Photosensor Circuit and Disk Removal and Replacement
      • 4.8.15 Timing Disk Removal and Replacement
      • 4.8.16 Tray Bracket Removal and Replacement
      • 4.8.17 Tray Bracket Spring Removal and Replacement
    • 4.9 LA10X-EB 4K Buffer Option
      • 4.9.1 Checkout Procedure
        • 4.9.1.1 Printing the Status Message
        • 4.9.1.2 Performing the Operations Test
        • 4.9.1.3 Isolating a LA10X-EB Buffer Option Problem
      • 4.9.2 4K Buffer Removal
      • 4.9.3 4K Buffer Installation
  • 5 Operating Features Summary
    • 5.1 General
    • 5.2 Set-Up Features
    • 5.3 Switch Selectable Features
    • 5.4 Jumper Selectable Features
  • 6 Recommended Spare Parts List
    • 6.1 General

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