Contents

Chapter 1 – Introduction

• 1.1 General Description
• 1.2 Features
  • 1.2.1 19-Key Auxiliary Keypad
  • 1.2.2 Hold-Screen Mode
  • 1.2.3 Direct Cursor Addressing
  • 1.2.4 Identification Feature
  • 1.2.5 Terminal Interface
  • 1.2.6 Copier Option
  • 1.2.7 Printer Interface Option
• 1.3 VT52 Specifications
• 1.4 Documentation Ordering Information

Chapter 2 – Installation

• 2.1 Site Planning
• 2.2 Unpacking and Inspection
• 2.3 Installation and Setup
  • 2.3.1 Off-Line Tests
  • 2.3.2 On-Line Tests
• 2.4 Acceptance Test Procedures
  • 2.4.1 Flashing Cursor Check
  • 2.4.2 Escape and Control Command Check
  • 2.4.3 Terminal Identification Check
  • 2.4.4 Alternate Keypad Mode
  • 2.4.5 Hold Screen Mode
  • 2.4.6 Direct Cursor Addressing
  • 2.4.7 On-Line Acceptance Test

Chapter 3 – Operation

• 3.1 Controls
  • 3.1.1 Operator Controls
  • 3.1.2 Keyboard
    • 3.1.2.1 Alphabetic Keys
    • 3.1.2.2 Numeric/Symbol Keys
    • 3.1.2.3 Function Keys
    • 3.1.2.4 The CONTROL Key
    • 3.1.2.5 The BREAK Key
    • 3.1.2.6 Auxiliary Keypad
    • 3.1.2.7 The REPEAT Key
    • 3.1.2.8 The SCROLL Key
    • 3.1.2.9 The COPY Key
• 3.2 Operating Procedure
  • 3.2.1 Off-Line
  • 3.2.2 On-Line
• 3.3 User Maintenance

Chapter 4 – Technical Description

• 4.1 General
• 4.2 Functional Description
  • 4.2.1 VT52 Video Terminal
  • 4.2.2 VT52 Input Terminal
  • 4.2.3 VT52 Output Terminal
• 4.3 Module Description
  • 4.3.1 Data Paths, Memory, and Decoders Module (DP)
    • 4.3.1.1 RAM and Memory Buffer
    • 4.3.1.2 Video Shift Register (VSR)
    • 4.3.1.3 Decoders
    • 4.3.1.4 Character Generator
  • 4.3.2 ROM, UART, Timing Module (RUT)
    • 4.3.2.1 ROM and PC
    • 4.3.2.2 Timing
    • 4.3.2.3 Interface Module
    • 4.3.2.4 UART
  • 4.3.3 The Monitor and Power Supply Module
    • 4.3.3.1 The CRT
    • 4.3.3.2 Beam Deflection
    • 4.3.3.3 Power Supply
• 4.4 Keyboard
• 4.5 Microprogram
  • 4.5.1 Servicing the Keyboard
  • 4.5.2 Scrolling
  • 4.5.3 Hold-Screen Mode
  • 4.5.4 Terminal Identification
  • 4.5.5 Flashing the Cursor

Chapter 5 – Servicing

• 5.1 Service Philosophy
• 5.2 Subassembly Level Troubleshooting
  • 5.2.1 Identifying the Faulty Subassembly
  • 5.2.2 Analyzing the Symptoms
• 5.3 Subassembly Replacement
  • 5.3.1 Removing the Base Assembly
  • 5.3.2 Replacing the ROM, UART and Timing (RUT) or Data Path, Memory and Decoder (DP) Module
  • 5.3.3 Replacing the Monitor/Power Supply Module
  • 5.3.4 Replacing the Keyboard
  • 5.3.5 Replacing the CRT Assembly
  • 5.3.6 Replacing the Transformer Assembly
• 5.4 Display Alignments and Adjustments
  • 5.4.1 CRT Yoke Alignment
  • 5.4.2 Display Adjustments
    • 5.4.2.1 Height
    • 5.4.2.2 Width
    • 5.4.2.3 Vertical Linearity
    • 5.4.2.4 Focus
• 5.5 Voltage Checks
  • 5.5.1 Testing the NO VOLTAGE Condition
  • 5.5.2 Testing the +15 V Supply
  • 5.5.3 Testing the +5 V Supply
  • 5.5.4 Testing the -12 V Supply
• 5.6 Timing Waveforms
• 5.7 Monitor Waveforms

Chapter 6 – VT50-Series Copier Option

• 6.1 VT50-Series Copier Introduction
• 6.2 Copier Block Diagram
• 6.3 Copier Timing
• 6.4 Operating the Copier
• 6.5 Programming the Copier
• 6.6 Copier Removal and Replacement Procedure
• 6.7 Copier Maintenance
• 6.8 Copier Troubleshooting
• 6.9 Copier Specifications
• 6.10 Related Documentation

Chapter 7 – VT52 Printer Interface Option

• 7.1 VTXX-KA Introduction
• 7.2 Printer Interface Block Diagram
  • 7.2.1 Parallel Operation
  • 7.2.2 Serial Operation
• 7.3 VTXX-KA Installation
  • 7.3.1 Installation of the VTXX-KA Module
  • 7.3.2 VTXX-KA Cable Installation
    • 7.3.2.1 Serial EIA Printer Interface Cable Installation
    • 7.3.2.2 Parallel Printer Interface Cable Installation
• 7.4 Initial Set Up
• 7.5 Initial Test Procedure
• 7.6 VTXX-KA Operation Instructions
• 7.7 VTXX-KA Programming Information
  • 7.7.1 Host Computer Commands
  • 7.7.2 Data Format
  • 7.7.3 Synchronization
  • 7.7.4 Status Reporting
• 7.8 VTXX-KA Troubleshooting

Appendix A – Reference Data

• A.1 PROM, ROM Cross Reference Chart
• A.2 IC Pin Location Drawings