Zenith Z-100 PC series Manuals

Manuals and User Guides for Zenith Z-100 PC series. We have 1 Zenith Z-100 PC series manual available for free PDF download: Service Manual

Zenith Z-100 PC series Service Manual

Zenith Z-100 PC series Service Manual (380 pages)

Brand: Zenith | Category: Power Supply | Size: 25.59 MB

Table of Contents

Figures

3
Introduction

13
- Tables
  14
- Abbreviations
  15
- Chapter 1 Introduction and Specifications
  
  16
  - Diagnostics
    16
  - Introduction
    16
  - Volt Regulator
    16
  - Signal Bus
    17
  - Power Connector
    18
  - Theory of Operation
    18
  - Backplane I/O Connectors
    19
  - Diagnostic Leds
    19
  - Volt Regulator
    19
  - Detailed Circuit Description
    20
  - Power Distribution
    20
  - VDC Regulation
    20
  - Diagnostic Circuitry
    21
  - Signal Bus
    21
- Chapter 4 Troubleshooting
  
  26
  - DC Voltage Checks
    26
  - DC Voltages and Diagnostics
    26
  - General Troubleshooting
    26
  - Backplane Connector Fault Isolation
    28
  - Component Parts List
    29
  - Introduction
    29
  - Semiconductor Identification Index
    30
Schematic

36
- Figures
  37
- Tables
  37
- Abbreviations
  38
- Description
  39
- Introduction
  39
- Specifications
  41
- Installation
  42
- Configuration
  43
- Chapter 3 Operation
  
  44
  - Keyboard Codes
    44
  - Special Function Key Combinations
    48
  - Introduction
    49
  - Theory of Ope!"Ation
    49
  - Theory of Operation
    49
  - Circuit Description
    50
  - Detailed Circuit Description
    50
  - Introduction
    50
  - Outputs
    51
- Chapter 6 Disassembly
  
  54
  - Disassembly Procedure
    54
- Chapter 7 Troubleshooting
  
  56
- Chapter 8 Reassembly
  
  57
  - Reassembly Procedure
    57
  - Parts List
    59
  - Replacement Parts
    59
  - Keyboard Assembly Z-150
    60
  - Keyboard Assembly Z-160
    62
  - 8048 Emulator
    65
  - Part Number Index
    66
  - Semiconductor Identification
    66
  - Introduction
    75
Table of Contents

137
- Chapter 1 -Introduction
  140
- Specifications
  140
- Chapter 2 - Installation
  
  143
  - Controls and Connections
    143
  - ZCM-1490 Front View
    143
  - Color Bar Test
    145
  - Fill Screen Test
    145
  - Initial Tests
    145
  - Set-Up and Operation
    145
  - Chapter 3 - Disassembly
    146
  - Rear Chassis Panel Removal
    147
  - Rear Cover Removal
    147
  - Video Board Removal
    148
  - Control Board Removal
    149
  - PIN Board Removal
    149
  - Fan and Bottom Panel Removal
    150
  - Support Bracket and Shield Removal
    150
  - Deflection Board Assembly Removal
    151
  - Deflection Board Removal
    152
  - Assembly Removal
    153
  - Power Supply/Dynamic Focus Board Assembly Removal
    153
  - Power Supply/Focus Board
    153
  - Power Supply and Dynamic Focus Board Removal
    154
  - CRT Lead Dress and Removal
    155
  - Chapter 4 - Adjustments
    156
  - Video Board Adjustment Locations
    157
  - Deflection Board Adjustment Locations
    158
  - Dynamic Focus Board Adjustment Locations
    159
  - PIN Board Adjustment Locations
    159
  - Control Board Adjustment Locations
    160
  - Deflection Board Adjustments
    160
  - Horizontal Hold
    160
  - Preparation
    160
  - Horizontal DC Raster Centering
    161
  - Horizontal Phase
    161
  - Horizontal Size
    161
  - Vertical DC Raster Centering
    161
  - Vertical Hold
    161
  - Vertical Size
    161
  - Dynamic Focus
    162
  - Focus
    162
  - Vertical Linearity
    162
  - North-South Pincushion
    163
  - Pincushion Adjustments
    163
  - CRT Cutoff
    164
  - CRT Gun Waveforms
    164
  - East-West Pincushion
    164
  - Final Checks
    165
  - Video Gain
    165
- Chapter 5 - Circuit Descriptions
  
  167
  - Functional Overview
    167
  - Video Amplifiers
    169
  - Video Input Processing
    169
  - Cascode Output Amplifier
    170
  - DC Restoration
    170
  - Video Amplifer Section (Green)
    170
  - Video Drivers
    170
  - Black Level
    171
  - Class AB Output Stage
    171
  - Cutoff
    171
  - Mode Selection
    171
  - Retrace Line Prevention
    171
  - Sync Input Processing
    171
  - Horizontal Controls
    172
  - Vertical Processing and Controls
    172
  - Horizontal Deflection
    173
  - Horizontal Driver
    173
  - Horizontal Output
    173
  - Anode Voltage
    174
  - Anode Voltage Regulator
    174
  - Automatic Brightness Limiter
    174
  - Control Grid Voltage
    174
  - High Voltage Shutdown
    174
  - Horizontal Centering
    174
  - Vertical Centering
    175
  - Vertical Deflection
    175
  - Blanking Pulses
    176
  - East-West Waveform Generator
    176
  - Pincushion Correction
    176
  - East-West Regulator
    177
  - North-South Waveform Generator
    178
  - Degaussing Coil
    180
  - Dynamic Focus
    180
  - North-South Output
    180
  - Chapter 6 - Troubleshooting
    181
  - Safety Guidelines
    181
  - AC Leakage Test
    182
  - Inspection and Preparation
    183
  - Suggested Tools and Equipment
    183
  - Cleaning Procedure
    184
  - Color Bar Test
    184
  - Disk-Based Diagnostics
    184
  - Fill Screen Test
    184
  - Surface Mount Component Replacement
    185
  - Measurements
    191
  - Resistance Measurements
    191
  - Video Board Transistor Resistance Measurements
    191
  - Measurements
    193
  - PIN Board IC Voltage Measurements
    193
  - PIN Board Transistor Voltage
    193
  - Video Board Transistor Voltage
    193
  - Designated Components Parts List
    196
  - Miscellaneous Parts List
    212
  - Heath Parts List
    213
Specifications

239
- Chapter 2 Installation
  244
- Configuration
  244
- Installation Steps
  246
- Circuit Description
  248
- Detailed Circuit Description
  249
- Floppy Disk Controller
  250
- Detailed Circuit Description
  251
- CRT Controller
  255
- Microprocessor Interface Signals
  255
- CRT Controller Registers
  257
- CRT Monitor Signals
  257
- Screen Memory and Character Generator Signals
  257
- Programming the Registers
  258
- Raster Scan Signals
  262
- Video I/O Devices
  263
- Programming Sequence
  268
- Detailed Circuit Description
  269
- Detailed Circuit Description
  270
- Video RAM
  270
- Video RAM Address Multiplexers
  270
- Detailed Circuit Description
  271
- Character ROM
  273
- Detailed Circuit Description
  273
- Gate Array Functional Description
  273
- Character and Attribute Data Byte Format
  277
- Video Port Configuration
  277
- Character and Attribute Data Registers
  278
- Data Serialization
  278
- Video Output
  280
- Detailed Circuit Description
  281
- PAL Equations
  283
- Backplane Signal Names
  284
Figures

311
- Chapter 2 Introduction
  312
- Parts Supplied
  312
- Single Disk Drive Configuration
  313
- Configuration
  314
- Drive a
  314
- Drive B
  314
- Dual Disk Drive Configuration
  314
- Multiple Disk Drive Configuration
  314
Table of Contents

318
- List of Tables
  321
- Abbreviations/Mnemonics
  322
- General Description
  324
- Performance Specifications
  324
- Section I Introduction
  324
- Specification Summary
  324
- Functional Specifications
  325
- Physical Specifications
  325
- Drive Mechanism
  326
- Functional Characteristics
  326
- Positioning Mechanics
  326
- Read/Write and Control Electronics
  326
- Read/Write Heads
  326
- Reliability Specifications
  326
- Recording Formats
  327
- Drive Selection
  328
- Functionaloperations
  328
- Motor on
  328
- Power Sequencing
  328
- Track Accessing
  328
- Direction Select
  329
- Side Select
  335
- Write Data
  335
- Write Gate
  335
- Output Lines
  336
- Index/Sector
  337
- Read Data
  337
- Track 00
  337
- Frame Ground
  338
- Power Interface
  338
- Ready
  338
- Write Protect
  338
- Introduction
  339
- J2!P2 Connector
  339
- Frame Grounding
  340
  - Theory of Operation
    341
  - Read/Write Operations
    341
  - Read/Write Head
    343
  - Write Circuit Operation
    344
  - Read Circuit Operation
    345
  - Drive Motor Control
    345
  - Index Detector
    346
  - Track Zero Indication
    346
  - Track Accessing
    346
    
    Stepper Motor
    346
    
    Stepper Control
    346
  - Drive Select
    347
  - Write Protect
    348
  - Ready
    348
- Section V Maintenance
  349
  - Maintenance Equipment
    349
    
    Alignment Diskette
    349
    
    Exerciser PCB
    349
    
    Special Tools
    350
  - Diagnostic Techniques
    350
    
    Introduction
    350
    
    Soft Error" Detection and Correction
    350
    
    Write Error
    350
    
    Read Error
    351
    
    Seek Error
    351
  - Trouble-Shooting
    351
  - Adjustments
    356
    
    Head Radial Alignment
    356
    
    Read/Write Head(S) Azimuth Check
    357
    
    Head Amplitude Check
    358
    
    Track Zero Detector Assembly Adjustment
    359
    
    Index/Sector Timing Adjustment
    360
    
    Motor Speed Adjustment (Using a Frequency Counter)
    361
    
    Write Protect Detector
    361
    
    Test Points on Drive PCB
    361
  - Removals and Replacements
    363
    
    Faceplate Latch
    363
    
    Direct Drive Motor Assembly
    363
    
    Head and Carriage Assembly
    363
    
    Stepper Motor and Actuator Assembly
    363
    
    Clamp Hub
    363
    
    Write Protect Sensor and Index Detector
    363
    
    Track Zero Photo Detector
    363
  - Recommended Incoming Receiving Inspection
    364
    
    Necessary Equipment
    364
    
    Procedure
    364
- Schematic Diagrams
  365
- Illustrated Parts Catalog
  370
  - Description
    370
  - Quantity Per Assembly
    370
  - Recommended Spare Parts Stocking Guide
    380

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