LA30 DECwriter Maintenance Manual

Company:Digital Equipment Corporation
Part:DEC-00-LA30-DC
Date:1972-08
Keywords:

Table of Contents

  • Chapter 1 Introduction
    • 1.1 Scope
    • 1.2 General Description
    • 1.3 Technical Characteristics
  • Chapter 2 Installation
    • 2.1 Site Considerations
    • 2.2 Unpacking and Inspection
    • 2.3 LA30 Installation
    • 2.4 Cable Connections
      • 2.4.1 Power Cable
      • 2.4.2 Interface Cable
    • 2.5 Unit Checkout Procedure
  • Chapter 3 Operation
    • 3.1 Controls and Indicators
    • 3.2 Operating Procedures
      • 3.2.1 Loading Paper
      • 3.2.2 Changing Ribbon
  • Chapter 4 Principles of Operation
    • 4.1 Overview
      • 4.1.1 Dot Matrix
      • 4.1.2 Keyboard
      • 4.1.3 Electronics
    • 4.2 Functional Description
      • 4.2.1 Motor Drive System
      • 4.2.2 Control Logic
    • 4.3 Operating Cycles
      • 4.3.1 Print Cycle
        • 4.3.1.1 Identify Printing Characters
        • 4.3.1.2 Start Function Timers
      • 4.3.2 Carriage Return Cycles
      • 4.3.3 Line Feed Cycle
      • 4.3.4 Character Visibility Cycle
    • 4.4 Power Fail (Drawing D-CS-G8004-0-1)
  • Chapter 5 Maintenance
    • 5.1 Introduction
    • 5.2 Cleaning Procedures
    • 5.3 Adjustment Procedures
      • 5.3.1 Line Feed Pawl and Detent
      • 5.3.2 Print Head
      • 5.3.3 Impact Loading
      • 5.3.4 Left and Right Margin
    • 5.4 Replacement Procedures
      • 5.4.1 Keyboard Assembly
      • 5.4.2 Print Head and Cable Assembly
      • 5.4.3 Carriage Assembly
      • 5.4.4 Print Bar Assembly
      • 5.4.5 Ribbon Drive Motor
      • 5.4.6 Ribbon Drive Clutch Assembly
      • 5.4.7 Carriage Stepping Motor
      • 5.4.8 Drive Belt
      • 5.4.9 Keyboard Indicator Lamp
      • 5.4.10 Line Feed Solenoid
  • Chapter 6 Interfacing
    • 6.1 Introduction
    • 6.2 Serial Interface
      • 6.2.1 General
      • 6.2.2 Current Loop Operation
      • 6.2.3 M973 Cable Connector
      • 6.2.4 M598 Level Converter
      • 6.2.5 M7389 Addressable Asynchronous Transceiver (UART)
      • 6.2.6 M7731 Serial Interface Control
    • 6.3 LA30 Parallel Interface
      • 6.3.1 General
      • 6.3.2 Timing Differences
  • Appendix A LA30 Illustrated Parts Breakdown

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