MAI Basic Four 4398 Manuals

Manuals and User Guides for MAI Basic Four 4398. We have 1 MAI Basic Four 4398 manual available for free PDF download: Service Manual

MAI Basic Four 4398 Service Manual

MAI Basic Four 4398 Service Manual (294 pages)

Brand: MAI Basic Four | Category: Desktop | Size: 53.7 MB

Table of Contents

Table of Contents

3
Table of Contents

9
- System S/10 and Office Display Terminal
  14
- Introduction
  15
- Purpose
  15
- Related Documents
  15
- Safety Precautions
  15
- Overview
  16
- Physical Description
  17
- System S/ 10
  17
- Main Console
  18
- 1.5.4 Keyboard Assembly
  19
- Operational Description
  19
  - S/10-0DT Internal Components
    20
- Specifications
  22
- AC Power Requirements
  25
  - Ground Checks
    26
- Installation
  25
- Introduction
  25
- Preinstallation Checks
  25
- Unpacking and Inspecting the S/10-0Dt
  25
- Power Requirements
  26
- Installing the S/10-0Dt
  27
  - Left Rear View
    28
    
    Attaching and Detaching the Keyboa Rd
    29
  - Right Rear View
    29
- Serial Port Interface
  30
  - Main Serial Port Pin Assignments
    30
  - Auxiliary Port Pin Assignments
    31
- Operational Functions
  33
- Standard Keyboard Layout
  33
  - Key
    33
  - The Main Key
    33
  - ODT and S/10 Keyboard
    34
    
    The Auxiliary
    35
    
    Key
    37
  - Proper Disk Insertion
    46
    
    Of Disk
    47
    
    Write Protection
    47
  - Resetting the S
    47
  - Functional Description
    49
  - Introduction
    49
  - Operation
    49
    
    Display Characters
    50
  - 80 Column Format
    50
  - Special Graphics in the 80 Column Mode
    51
  - The 132 Column Font
    52
    
    Status Line
    54
    
    Assembling a Charac
    55
  - Interrupt System
    56
  - System Clocks
    56
  - The Disk Controller System
    57
  - System Block Diagram
    57
  - Vectored Interrupt System
    59
- System Description for the Office Display Terminal
  59
- Advanced Video Processor Circuit Description
  61
  - The Interrupt System and Timer
    63
  - The I/O Ports
    63
  - Z80-L Control Signals
    63
  - Device Enable Signals
    64
  - I/O Port Input/Output Signals
    64
  - Master Clock and Divider Chain
    65
  - Line Buffer Control
    65
  - Line Buffer
    66
  - Character Generation
    67
  - Video out
    67
  - Direct Memory Access (DMA)
    68
  - The DMA
    68
  - Non-Volatile RAM
    69
  - Nvr
    69
- System Description for System
  61
  - Z80-2 and the Floppy Disk Controller
    61
  - AFC Timing
    61
- Advanced Floppy
  70
  - Circuit Description
    73
- Head Positioning Control
  73
- Track
  73
- Index Sensor
  75
  - Horizontal Output Transformer
    81
  - Vertical Deflection
    81
  - The Power Supplies
    82
  - Introduction
    83
  - Tools and Test Equipment
    83
  - Periodic and Preventive Maintenance
    84
    
    Cleaning
    84
    
    Visual Check
    84
  - Keyboard Assembly
    84
  - Cabinet Rear Lower Left Corner
    86
  - Cabinet Cover Latch
    86
  - Voltage Checks
    87
- Adjustment Procedures
  87
  - 4.5.1 Disk Drive Adjustments
    89
  - Radial Track Alignment Patterns
    90
  - Index-To-Data Alignment Pattern
    91
    
    Radial-Track Alignment
    92
    
    Speed Control Adjustment
    92
    
    Track 00 End Stop Adjus Tment
    92
    
    Track 00 Sensor Alignment
    92
    
    Azimuth Alignment
    93
    
    Drive Belt Adjustment
    93
    
    Disk Drive er Ase Measurement
    95
    
    Disk Drive High Frequency Playback Measurement
    95
    
    Video Display Adjustment
    101
    
    Advanced Video Processor Test Procedure
    103
- Test 24 Diagnostic
  104
  - Setup
    105
- Key Functions
  105
- Test 24 Output
  105
  - Keyboard Test
    106
  - Test 24 Detail
    106
  - Initialization
    106
- Normal Execution
  107
  - Line Interrupt Servicing
    108
- Advanced Floppy Controller (AFC) Tr Oubleshooting
  110
  - Advanced Floppy Controller Test Procedure
    110
- 4.6.7 Troubleshooting Chart
  111
  - System S/10 Troubleshooting Chart
    113
    
    Disk Drive Trouble Anal Ysis
    117
    
    Drive Won 'T Step or Steps Err a Ticall y
    117
    
    Preliminary Troubleshooting Steps
    117
- Head/Carriage Oscillates at Track 00
  117
  - Drive Motor Won't Rotate
    118
  - Head will Not Load
    120
- Bad Index Output
  120
  - Motor Control Timing
    120
  - Read Timing
    122
  - Write Timing
    124
  - Video Electronics Assembly
    137
  - Chassis Top Securing Screws
    142
  - Drive Securing Screws
    145
  - Front Panel Securing Screws
    145
  - Disk Drive, Top View
    147
  - Disk Drive, Bottom View
    148
Door Button Assembly/Stepper Band

149
- Door Button Assembly
  149
- Removal/Replacement Procedures
  149
- Stepper Band
  149
- Printed Circuit Board Assembly (PCBA)
  150
- Right~Hand Guide/Write Protect Assembly
  151
  - Activity Indicator Assembly
    152
  - Left-Hand Guide Assembly
    152
  - Front Panel Bezel and Activity
    152
  - Led
    152
- Shield Assembly
  151
- Cone Assembly
  153
- Carrier Assembly
  154
- Index/Load Boss Assembly
  155
- Drive Motor
  156
- Solenoid
  156
- Track 00 Sensor
  157
- Stepper Motor
  160
- Head/Carriage Assembly
  161
- Head Load Pad Assembly
  162
  - ODT - S/10 Keyboard
    166
  - ODT - S/10 Keyboard and Cabinet Assembly
    167
  - ODT - S/10 CRT Assembly
    169
  - CRT Connector
    170
  - S/10 Disk Drive Assembly
    172
- Spindle, Bearings and Pulley
  162
- Harness Assembly
  174
  - Disk Drive Ready PCBA Component Layout
    179
  - Advanced Video Processor, (16K) Parts List
    181
  - Advanced Video Processor, (64K) Parts List
    190
  - Advanced Floppy Controller Parts List
    196
  - ODT Power Supply Parts List Phase Lb
    201
  - Diagnostic and Failure Code Indicators
    219
  - Head Select Decode Matrix
    223
  - Write Data Precompensation
    227
  - Host Bus Status Signals
    230
  - Summary of Host Bus Status Signals
    231
  - Host Bus Control Signals
    232
  - Request Sense Status Error Codes
    241
  - Sector Field Description
    250
  - Operational Error Codes
    253
  - Fault Diagnostics
    254

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