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Power Supply
Z-100 PC series
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Zenith Z-100 PC series Service Manual
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Figures
Table of Contents
Power Supply Rear View
Power Supply Output
Operation at no Load
Power Supply Good (PSG) Signal
Power Supply Connectors
Introduction
Tables
Abbreviations
Chapter 1 Introduction and Specifications
Diagnostics
Introduction
Volt Regulator
Signal Bus
Power Connector
Theory of Operation
Backplane I/O Connectors
Diagnostic Leds
Volt Regulator
Detailed Circuit Description
Power Distribution
VDC Regulation
Diagnostic Circuitry
Signal Bus
Chapter 4 Troubleshooting
DC Voltage Checks
DC Voltages and Diagnostics
General Troubleshooting
Backplane Connector Fault Isolation
Component Parts List
Introduction
Semiconductor Identification Index
Schematic
Figures
Tables
Abbreviations
Description
Introduction
Specifications
Installation
Configuration
Chapter 3 Operation
Keyboard Codes
Special Function Key Combinations
Introduction
Theory of Ope!"Ation
Theory of Operation
Circuit Description
Detailed Circuit Description
Introduction
Outputs
Chapter 6 Disassembly
Disassembly Procedure
Chapter 7 Troubleshooting
Chapter 8 Reassembly
Reassembly Procedure
Parts List
Replacement Parts
Keyboard Assembly Z-150
Keyboard Assembly Z-160
8048 Emulator
Part Number Index
Semiconductor Identification
Introduction
Table of Contents
Chapter 1 -Introduction
Specifications
Chapter 2 - Installation
Controls and Connections
ZCM-1490 Front View
Color Bar Test
Fill Screen Test
Initial Tests
Set-Up and Operation
Chapter 3 - Disassembly
Rear Chassis Panel Removal
Rear Cover Removal
Video Board Removal
Control Board Removal
PIN Board Removal
Fan and Bottom Panel Removal
Support Bracket and Shield Removal
Deflection Board Assembly Removal
Deflection Board Removal
Assembly Removal
Power Supply/Dynamic Focus Board Assembly Removal
Power Supply/Focus Board
Power Supply and Dynamic Focus Board Removal
CRT Lead Dress and Removal
Chapter 4 - Adjustments
Video Board Adjustment Locations
Deflection Board Adjustment Locations
Dynamic Focus Board Adjustment Locations
PIN Board Adjustment Locations
Control Board Adjustment Locations
Deflection Board Adjustments
Horizontal Hold
Preparation
Horizontal DC Raster Centering
Horizontal Phase
Horizontal Size
Vertical DC Raster Centering
Vertical Hold
Vertical Size
Dynamic Focus
Focus
Vertical Linearity
North-South Pincushion
Pincushion Adjustments
CRT Cutoff
CRT Gun Waveforms
East-West Pincushion
Final Checks
Video Gain
Chapter 5 - Circuit Descriptions
Functional Overview
Video Amplifiers
Video Input Processing
Cascode Output Amplifier
DC Restoration
Video Amplifer Section (Green)
Video Drivers
Black Level
Class AB Output Stage
Cutoff
Mode Selection
Retrace Line Prevention
Sync Input Processing
Horizontal Controls
Vertical Processing and Controls
Horizontal Deflection
Horizontal Driver
Horizontal Output
Anode Voltage
Anode Voltage Regulator
Automatic Brightness Limiter
Control Grid Voltage
High Voltage Shutdown
Horizontal Centering
Vertical Centering
Vertical Deflection
Blanking Pulses
East-West Waveform Generator
Pincushion Correction
East-West Regulator
North-South Waveform Generator
Degaussing Coil
Dynamic Focus
North-South Output
Chapter 6 - Troubleshooting
Safety Guidelines
AC Leakage Test
Inspection and Preparation
Suggested Tools and Equipment
Cleaning Procedure
Color Bar Test
Disk-Based Diagnostics
Fill Screen Test
Surface Mount Component Replacement
Measurements
Resistance Measurements
Video Board Transistor Resistance Measurements
Measurements
PIN Board IC Voltage Measurements
PIN Board Transistor Voltage
Video Board Transistor Voltage
Designated Components Parts List
Miscellaneous Parts List
Heath Parts List
Specifications
Chapter 2 Installation
Configuration
Installation Steps
Circuit Description
Detailed Circuit Description
Floppy Disk Controller
Detailed Circuit Description
CRT Controller
Microprocessor Interface Signals
CRT Controller Registers
CRT Monitor Signals
Screen Memory and Character Generator Signals
Programming the Registers
Raster Scan Signals
Video I/O Devices
Programming Sequence
Detailed Circuit Description
Detailed Circuit Description
Video RAM
Video RAM Address Multiplexers
Detailed Circuit Description
Character ROM
Detailed Circuit Description
Gate Array Functional Description
Character and Attribute Data Byte Format
Video Port Configuration
Character and Attribute Data Registers
Data Serialization
Video Output
Detailed Circuit Description
PAL Equations
Backplane Signal Names
Figures
Chapter 2 Introduction
Parts Supplied
Single Disk Drive Configuration
Configuration
Drive a
Drive B
Dual Disk Drive Configuration
Multiple Disk Drive Configuration
Table of Contents
List of Tables
Abbreviations/Mnemonics
General Description
Performance Specifications
Section I Introduction
Specification Summary
Functional Specifications
Physical Specifications
Drive Mechanism
Functional Characteristics
Positioning Mechanics
Read/Write and Control Electronics
Read/Write Heads
Reliability Specifications
Recording Formats
Drive Selection
Functionaloperations
Motor on
Power Sequencing
Track Accessing
Direction Select
Side Select
Write Data
Write Gate
Output Lines
Index/Sector
Read Data
Track 00
Frame Ground
Power Interface
Ready
Write Protect
Introduction
J2!P2 Connector
Frame Grounding
Theory of Operation
Read/Write Operations
Read/Write Head
Write Circuit Operation
Read Circuit Operation
Drive Motor Control
Index Detector
Track Zero Indication
Track Accessing
Stepper Motor
Stepper Control
Drive Select
Write Protect
Ready
Section V Maintenance
Maintenance Equipment
Alignment Diskette
Exerciser PCB
Special Tools
Diagnostic Techniques
Introduction
Soft Error" Detection and Correction
Write Error
Read Error
Seek Error
Trouble-Shooting
Adjustments
Head Radial Alignment
Read/Write Head(S) Azimuth Check
Head Amplitude Check
Track Zero Detector Assembly Adjustment
Index/Sector Timing Adjustment
Motor Speed Adjustment (Using a Frequency Counter)
Write Protect Detector
Test Points on Drive PCB
Removals and Replacements
Faceplate Latch
Direct Drive Motor Assembly
Head and Carriage Assembly
Stepper Motor and Actuator Assembly
Clamp Hub
Write Protect Sensor and Index Detector
Track Zero Photo Detector
Recommended Incoming Receiving Inspection
Necessary Equipment
Procedure
Schematic Diagrams
Illustrated Parts Catalog
Description
Quantity Per Assembly
Recommended Spare Parts Stocking Guide
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SERVICE MODULE
Power Supply
Z-100 PC Series Computers
585-60-01
860-45
aNI'N
data
~.
systems
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Chapters
Figures
3
Introduction
13
Schematic
36
Table of Contents
137
Specifications
239
Figures
311
Table of Contents
318
Table of Contents
Troubleshooting
Chapter 4 Troubleshooting
26
Chapter 7 Troubleshooting
56
Chapter 6 - Troubleshooting
181
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