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4399
Service manual
MAI Basic Four 4399 Service Manual
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Table of Contents
System S/10 and Office Display Terminal
Introduction
Purpose
Related Documents
Safety Precautions
Overview
Physical Description
System S/ 10
Main Console
1.5.4 Keyboard Assembly
Operational Description
S/10-0DT Internal Components
Specifications
AC Power Requirements
Ground Checks
Installation
Introduction
Preinstallation Checks
Unpacking and Inspecting the S/10-0Dt
Power Requirements
Installing the S/10-0Dt
Left Rear View
Attaching and Detaching the Keyboa Rd
Right Rear View
Serial Port Interface
Main Serial Port Pin Assignments
Auxiliary Port Pin Assignments
Operational Functions
Standard Keyboard Layout
Key
The Main Key
ODT and S/10 Keyboard
The Auxiliary
Key
Proper Disk Insertion
Of Disk
Write Protection
Resetting the S
Functional Description
Introduction
Operation
Display Characters
80 Column Format
Special Graphics in the 80 Column Mode
The 132 Column Font
Status Line
Assembling a Charac
Interrupt System
System Clocks
The Disk Controller System
System Block Diagram
Vectored Interrupt System
System Description for the Office Display Terminal
Serial Input and Output Ports
Z80-L, the DMA and the DMA Controller
Line Buffer and Attribute Generator
Video Generator and Attribute Control
RAM-1, EPROM-1, and the Non-Volatile RAM
Advanced Video Processor Circuit Description
The Interrupt System and Timer
The I/O Ports
Z80-L Control Signals
Device Enable Signals
I/O Port Input/Output Signals
Master Clock and Divider Chain
Line Buffer Control
Line Buffer
Character Generation
Video out
Direct Memory Access (DMA)
The DMA
Non-Volatile RAM
Nvr
System Description for System
Z80-2 and the Floppy Disk Controller
AFC Timing
Advanced Floppy
Circuit Description
Head Positioning Control
Track
Index Sensor
Horizontal Output Transformer
Vertical Deflection
The Power Supplies
Introduction
Tools and Test Equipment
Periodic and Preventive Maintenance
Cleaning
Visual Check
Keyboard Assembly
Cabinet Rear Lower Left Corner
Cabinet Cover Latch
Voltage Checks
Adjustment Procedures
4.5.1 Disk Drive Adjustments
Radial Track Alignment Patterns
Index-To-Data Alignment Pattern
Radial-Track Alignment
Speed Control Adjustment
Track 00 End Stop Adjus Tment
Track 00 Sensor Alignment
Azimuth Alignment
Drive Belt Adjustment
Disk Drive er Ase Measurement
Disk Drive High Frequency Playback Measurement
Video Display Adjustment
Advanced Video Processor Test Procedure
Test 24 Diagnostic
Setup
Key Functions
Test 24 Output
Keyboard Test
Test 24 Detail
Initialization
Normal Execution
Line Interrupt Servicing
Advanced Floppy Controller (AFC) Tr Oubleshooting
Advanced Floppy Controller Test Procedure
4.6.7 Troubleshooting Chart
System S/10 Troubleshooting Chart
Disk Drive Trouble Anal Ysis
Drive Won 'T Step or Steps Err a Ticall y
Preliminary Troubleshooting Steps
Head/Carriage Oscillates at Track 00
Drive Motor Won't Rotate
Head will Not Load
Bad Index Output
Motor Control Timing
Read Timing
Write Timing
Video Electronics Assembly
Chassis Top Securing Screws
Drive Securing Screws
Front Panel Securing Screws
Disk Drive, Top View
Disk Drive, Bottom View
Door Button Assembly/Stepper Band
Door Button Assembly
Removal/Replacement Procedures
Stepper Band
Printed Circuit Board Assembly (PCBA)
Right~Hand Guide/Write Protect Assembly
Activity Indicator Assembly
Left-Hand Guide Assembly
Front Panel Bezel and Activity
Led
Shield Assembly
Cone Assembly
Carrier Assembly
Index/Load Boss Assembly
Drive Motor
Solenoid
Track 00 Sensor
Stepper Motor
Head/Carriage Assembly
Head Load Pad Assembly
ODT - S/10 Keyboard
ODT - S/10 Keyboard and Cabinet Assembly
ODT - S/10 CRT Assembly
CRT Connector
S/10 Disk Drive Assembly
Spindle, Bearings and Pulley
Harness Assembly
Disk Drive Ready PCBA Component Layout
Advanced Video Processor, (16K) Parts List
Advanced Video Processor, (64K) Parts List
Advanced Floppy Controller Parts List
ODT Power Supply Parts List Phase Lb
Diagnostic and Failure Code Indicators
Head Select Decode Matrix
Write Data Precompensation
Host Bus Status Signals
Summary of Host Bus Status Signals
Host Bus Control Signals
Request Sense Status Error Codes
Sector Field Description
Operational Error Codes
Fault Diagnostics
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System S/10 and Office Display Terminal
Download this manual
Basic
Four®
System S/10
(Machine
Type
4399)
Office Display Terminal
(Machine
Type
4398)
Service Manual
·
April 1983
BFISD 8072PA
Table of
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Chapters
Table of Contents
3
Table of Contents
9
Door Button Assembly/Stepper Band
149
Table of Contents
Troubleshooting
4.6.7 Troubleshooting Chart
111
System S/10 Troubleshooting Chart
113
Disk Drive Trouble Anal ysis
117
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S/10
4398
Office display terminal
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