Lear Siegler ADM-3 Alphanumeric Terminal Manuals

Manuals and User Guides for Lear Siegler ADM-3 Alphanumeric Terminal. We have 1 Lear Siegler ADM-3 Alphanumeric Terminal manual available for free PDF download: Maintenance Manual

Lear Siegler ADM-3 Maintenance Manual

Lear Siegler ADM-3 Maintenance Manual (148 pages)

DUMB TERMINAL

Brand: Lear Siegler | Category: Touch terminals | Size: 11 MB

Table of Contents

Table of Contents
3
1 General Description

9
- Introduction
  9
  - Capabilities
    9
- Physical Description
  9
- Specifications
  10
2 Installation

13
- Setting Internal Switches
  13
- Figure
  13
- Internal Switches and Controls
  13
- Front Panel Switches
  13
3 Operation

19
- General
  19
- Special Function Keys
  19
- Programming and Word Structure
  20
- Remote Control Functions
  20
  - Data Transmission Format
    23
4 Theory of Operation

25
- General
  25
- General Functional Description
  25
- Display Generation
  25
  - Display Refresh Operation
    25
  - Monitor Video and Drive Circuits
    25
  - Receiving and Storing Data
    25
  - Cursor Generation
    27
- Keyboard Logic
  27
- Data Transmitter Logic
  27
- CRT Display Matrix
  27
  - Interface Control Logic
    28
  - CRT Display Monitor
    28
  - Logic Description
    28
  - General Clear Circuit
    28
    
    Display Counters
    28
  - Display Counters, Block Diagram
    28
  - Display Counter Timing
    29
  - Offset Counter Logic
    30
  - Offset Counter Logic, Block Diagram
    30
- Cursor Control Logic
  31
- Memory Address Logic
  31
- Clear Screen Timing
  32
- Cursor Control Logic, Block Diagram
  33
  - Memory Address Logic, Block Diagram
    33
- Refresh Memory and Character ROM Logic
  35
- Erase Logic
  37
- Write Pulse Logic
  37
- Keyboard Logic
  37
- Keyboard Logic Timing
  38
- Beeper Logic
  39
- Data Receiver and Command Decoder Logic
  40
- Data Transmitter Logic
  40
- Data Transmitter Logic, Block Diagram
  41
- Video Blanking and Serializer Logic
  42
  - Video Blanking and Serializer Logic, Block Diagram
    42
- Monitor Drive Logic
  43
- Baud Rate Select Logic
  43
- Baud Rate Select Logic, Block Diagram
  43
- Interface Control Logic
  44
- Code Turnaround Control
  44
- Reverse-Channel Control
  44
- Power Supplies
  45
- CRT Display Monitor
  45
- Interface Timing for Code Turnaround
  45
- Interface Timing for Reverse-Channel Operation
  46
- Extension Current Loop
  49
5 Maintenance

51
- General
  51
- Installation
  51
- Routine Maintenance
  51
- Opening Adm-3 Cover
  51
- Adjustments
  51
- Contrast Adjustment
  51
- Brightness Adjustment
  51
- Low Voltage Supply
  51
- Interface Connector Terminal Assignments
  52
- Vertical Adjustments
  53
- Horizontal Adjustments
  53
- Focus Adjustment
  53
- Centering
  53
- Corrective Maintenance
  53
- Failure Analysis
  53
- Troubleshooting the Monitor
  54
- Removing and Replacing Monitor CRT and Subassemblies
  54
  - Inputs to Monitor, Timing Diagram
    55
- Troubleshooting the Main Circuit Board
  58
- Removing and Replacing the Main Circuit Board
  58
- Removing and Replacing Key Switch Contacts
  58
- Drawings
  67
- SCHEMATIC SHEET #2 - System Counters
  67
- SCHEMATIC SHEET #11 - Interface Control
  67
- Interface Control
  67
- Display Counter Timing
  68
- Interface Timing for Code Turnaround
  70
- Interface Timing for Reverse-Channel Operation
  71
- Schematic Sheet #3
  73
  - Offset Counter
    73
  - Cursor Registor
    73
  - Beeper Circuit
    73
- SCHEMATIC SHEET #4 - Memory Address Generation
  74
- Schematic Sheet #5- Data Receiver/Decoder
  77
- Manipulation of Display Address
  78
- Organization of Display Data in Refresh Memory
  79
- Schematic Sheet #6
  82
  - Clear Circuit
    82
  - Read Back
    82
  - Monitor Drive Signals
    82
  - Cursor Generation
    82
- Schematic Sheet #7
  85
  - Refresh Memory
    85
  - Character Generators
    85
  - Video Serializer
    85
  - Transmit Data Multiplexers
    85
- Schematic Sheet #9
  91
  - Data Transmitter
    91
  - Control Section of UART
    91
  - Current Loop SMTR/RCVR
    91
- Schematic Sheet #10- Baud Rate Generation
  94
- Baud Rate
  94
- Crt Display Monitor
  97
- Monitor Circuit Board Components Location
  98
  - Board Assembly
    100
- Circuit Board Front
  101
- Circuit Board Back
  102
- Parts List
  105
- Returning Equipment for Repair
  117
- Paint
  119
- Power Supply
  137

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