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Diablo 1610
Maintenance manual
Xerox Diablo 1610 Maintenance Manual
Hyterm communications terminal
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Manual
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Contents
Table of Contents
Bookmarks
Table of Contents
Table of Contents
Hyterm Communications Terminal
Section 1 - Introduction
1.1 General Description
1.2 Scope
1.3 Related Documents
Section 2 - Theory of Operation
Introduction
General Operation
HPRO Board Block Diagram
8080 Microprocessing Unit (MPU)
Architecture
Timing
Basic Processor Operation
Typical Instruction Cycle (Output Instruction)
Clock Generator (8224)
Bus Driver/System Controller (8228)
Bus Control
System Logic Control
Memory Timing
I/O Port Numbering
Input Port
Interrupt Handling
Memory
Addressing
Reading
Writing
Timing
Input/Output
I/O Port (8212)
Keyboard Data Input (Port 0)
Keyboard Control Switch Input (Port 1)
Control Panel Switch Inputs (Ports 2 and 3)
Baud Rate Factor (Output Port 1)
Miscellaneous Outputs (Port 0)
USART (Ports 4 and 14)
Miscellaneous Circuitry
3-Terminal Voltage Regulators
Level Converters
USART Control/Status Words
Jumpers
I/O Ports 5, 6, and 7
HPRO Jumpers
Transfer of Information from the Printer
Carriage and Printwheel Position Data
Position Latches
Carriage Counter Decrement Control
Block Diagram, LOGIC-2 Board
Carriage Counter Control
Printwheel Counter Control
Option Jumpers
Oscillator
Logic-2 Board, Part No. 40510-4X
Program Control Loop
Data Processing Loop
Data Output Loop
Basic Operation
Timing
Servo Board, Part No. 40520-XX
Basic Operation, Printer Microprocessor
D-A Converter Circuit
Sample and Hold Circuit
Servo Direction Switching
Typical Sample and Hold Circuit
Carriage Position Tachometer Circuit
Servo Tachometer Circuits
Servo Summation Amplifier
Servo Position Transducer
Transducer (XDCR) Board, Part No. 40515-03
Sine-Wave Drive Generator
Servo Position Transducer
Servo Feedback Amplifier
Servo Feedback Amplifier Waveforms
Servo Feedback Demodulator/Integrator/Amplifier
Carriage Power Amplifier Board, Part No. 40525-XX
Carriage Power Amplifier Circuit
Servo Feedback Circuit
Power Monitor Circuit
Paper Feed Drive Circuit
Printwheel Power Amplifier Circuit
Paper Feed Drive Waveforms
Ribbon Lift Driver Circuit
Ribbon Feed Drive Circuit
Hammer Energy Control and Drive Circuit
Hcur L Board (Optional)
General Operation
Receiver Circuit
Block Diagram, Current Loop Data Flow
Transmitter Circuit
Current Loop Operation
Full Duplex, Passive
Full Duplex, Active
Half-Duplex, Passive
Half-Duplex, Active
Power Supplies
Key Positions of Hall-Effect and Saturable-Core Keyboards
2.10 Keyboard
Key Encoding
2.10.1.2 Mos Decoder/Encoder
2.10.1.3 Strobe Generation
2.10.1.4 Output Drivers
2.10.1.5 Logic Levels
Saturable-Core Keyboard (Schematic No. 400512-01)
Basic Operation
Keyswitch
2.10.2.3 Encoder/Decoder/Processor
Address Logic
2-39. Block Diagram, Saturable-Core Keyboard
2.10.2.5 Keyswitch Matrix
2.10.2.6 Sense Amplifier
2.10.2.7 Strobe Logic
Function Key Logic
Control Panel
Sense Amplifier TPA and TPB
Switches
Form Length Switch
Audible Alarm
Indicators
2.12 Power Supply
2.12.1 Boschert Power Supply Part No. 26021-XX
General Description
2.12.1.2 Isolation
2.1.2.1.3 Theory of Operation
2.12.1.4 Input Current Limiting
2.12.1.5 Input Rfi Fi Lter
Full-Wave Bridge Rectifier
Local +15 Volt Power Supply
Power Switch and Switching Regulator Amplifier
Lcsmoothing Filter
Spike Catcher
Inverter
Dcoutputcircuits
Volt Error Amplifier
Opto-Isolator
Block Diagram, LHR Power Supply
LHR Power Supply, Part No. 400062-01
Detailed Description
Section 3 - Maintenance
Introduction
General Rules
Top Cover Removal
3.2 Maintenance Procedures
Supplies
Cleaning and Inspection
Lubrication
Carrier System
Carriage System Lubrication Points
Carriage System
Platen System
Covers and Switches
Module/Subassembly Removal and Replacement
Circuit Boards
Hcurl Board Field Installation
Major Assemblies and Modules
Current Loop Connections
Power Supply
Control Panel
Power Supply Connections
Keyboard
Keyswitch Replacement
Cooling Fan
Paper Feed Motor
Paper Feed Motor Removal
Paper Carrier Subassembly
Carrier System Removal
Carrier System Removal
Carrier System Replacement
Carriage Subassembly
3.4 Adjustments
Printer
Carrier Assembly Adjustment
Paper Feed (Platen) Drive Adjustments
Carriage Drive Cable Adjustment
Adjustment Tools
Platen-To-Printwheel Adjustment
Ribbon Height Adjustment
Hammer Adjustments
Hammer Adjustment Tool
Carriage Home Adjustment
Paper Chute Adjustment
Paper-Out Switch Adjustment
Reference Designators
Keyboard Cable
Power Supply Connections
Integrated Circuits
Ascii Code Chart
Schematics and Logic Drawings
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XEROX
82333 Rev. C
Diablo Systems Incorporated
A Xerox Company
HyTerm Communications Terminal
Model 1610/1620
Maintenance Manual
December, 1978
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