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Lear Siegler Manuals
Touch terminals
ADM-3
Maintenance manual
Lear Siegler ADM-3 Maintenance Manual
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
1 General Description
Introduction
Capabilities
Physical Description
Specifications
2 Installation
Setting Internal Switches
Figure
Internal Switches and Controls
Front Panel Switches
Setting Front Panel Switches
Setting Display Controls
Connecting Cables & Turning on Power
Background Intensity ·Control
3 Operation
General
Special Function Keys
Programming and Word Structure
Remote Control Functions
Data Transmission Format
4 Theory of Operation
General
General Functional Description
Display Generation
Display Refresh Operation
Monitor Video and Drive Circuits
Receiving and Storing Data
Cursor Generation
Keyboard Logic
Data Transmitter Logic
CRT Display Matrix
Interface Control Logic
CRT Display Monitor
Logic Description
General Clear Circuit
Display Counters
Display Counters, Block Diagram
Display Counter Timing
Offset Counter Logic
Offset Counter Logic, Block Diagram
Cursor Control Logic
Memory Address Logic
Clear Screen Timing
Cursor Control Logic, Block Diagram
Memory Address Logic, Block Diagram
Refresh Memory and Character ROM Logic
Erase Logic
Write Pulse Logic
Keyboard Logic
Keyboard Logic Timing
Beeper Logic
Data Receiver and Command Decoder Logic
Data Transmitter Logic
Data Transmitter Logic, Block Diagram
Video Blanking and Serializer Logic
Video Blanking and Serializer Logic, Block Diagram
Monitor Drive Logic
Baud Rate Select Logic
Baud Rate Select Logic, Block Diagram
Interface Control Logic
Code Turnaround Control
Reverse-Channel Control
Power Supplies
CRT Display Monitor
Interface Timing for Code Turnaround
Interface Timing for Reverse-Channel Operation
Extension Current Loop
5 Maintenance
General
Installation
Routine Maintenance
Opening Adm-3 Cover
Adjustments
Contrast Adjustment
Brightness Adjustment
Low Voltage Supply
Interface Connector Terminal Assignments
Vertical Adjustments
Horizontal Adjustments
Focus Adjustment
Centering
Corrective Maintenance
Failure Analysis
Troubleshooting the Monitor
Removing and Replacing Monitor CRT and Subassemblies
Inputs to Monitor, Timing Diagram
Troubleshooting the Main Circuit Board
Removing and Replacing the Main Circuit Board
Removing and Replacing Key Switch Contacts
Drawings
SCHEMATIC SHEET #2 - System Counters
SCHEMATIC SHEET #11 - Interface Control
Interface Control
Display Counter Timing
Interface Timing for Code Turnaround
Interface Timing for Reverse-Channel Operation
Schematic Sheet #3
Offset Counter
Cursor Registor
Beeper Circuit
SCHEMATIC SHEET #4 - Memory Address Generation
Schematic Sheet #5- Data Receiver/Decoder
Manipulation of Display Address
Organization of Display Data in Refresh Memory
Schematic Sheet #6
Clear Circuit
Read Back
Monitor Drive Signals
Cursor Generation
Schematic Sheet #7
Refresh Memory
Character Generators
Video Serializer
Transmit Data Multiplexers
Schematic Sheet #9
Data Transmitter
Control Section of UART
Current Loop SMTR/RCVR
Schematic Sheet #10- Baud Rate Generation
Baud Rate
Crt Display Monitor
Monitor Circuit Board Components Location
Board Assembly
Circuit Board Front
Circuit Board Back
Parts List
Returning Equipment for Repair
Paint
Power Supply
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ADM-3
DUMB TERMINAL
MAINTENANCE MANUAL
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Table of Contents
Troubleshooting
Troubleshooting the Monitor
54
Troubleshooting the Main Circuit Board
58
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