HP HP 7937 Manuals

Manuals and User Guides for HP HP 7937. We have 1 HP HP 7937 manual available for free PDF download: Support Manual

HP HP 7937 Support Manual

HP HP 7937 Support Manual (249 pages)

DISC DRIVES

Brand: HP | Category: Storage | Size: 11.52 MB

Table of Contents

Table of Contents
9
Chapter 1

19
- Product Information
  19
- Introduction
  19
- Product Description
  19
- Documentation Supplied
  20
- Supporting Documentation
  20
- Product Structure
  20
- Specifications
  20
- Serial Number
  20
- Supported Equipment
  20
- Test Equipment Required
  20
- Warranty
  20
- Support Strategy
  20
Chapter 2

23
- Site Planning and Requirements
  23
- Introduction
  23
- Site Planning
  23
- Specifications
  23
- Cabling Limitations
  23
Chapter 3

25
- Installation and Configuration
  25
- Introduction
  25
- Shipping Latch
  25
- Drive Installation
  26
- Primary Power Requirements
  26
- Controls, Indicators, and Connectors
  26
  - Line- Switch
    26
  - Channel Address/Diagnostic Switch
    26
    
    Run Time Mode
    27
    
    Diagnostic Mode
    27
  - LED Display
    28
  - HP-IB Connector
    28
  - Power Fuse
    28
  - Line Connector
    28
- CPU Connection - HP-IB Systems
  28
  - HP-IB Cabling
    28
  - HP-IB Device Address
    29
Chapter 4

33
- Preventive Maintenance
  33
- Introduction
  33
Chapter 5 Page

35
- Functional Description
  35
- Introduction
  35
- Block Diagrams
  36
- Signal Notation
  36
- List of Mnemonics
  36
- Disc Format
  37
- Addressing Structure
  41
- Addressing Mode
  41
- Disc Sparing
  41
  - Sector Sparing
    41
  - Track Sparing
    42
- Controller PCA-A6
  42
- Servo System
  45
  - Head-Disc Assembly A3
    46
    
    Dedicated Servo Code
    46
    
    Sampled Servo Code
    47
    
    Servo Head
    47
    
    Servo Read Preamplifier/Write Driver IC
    47
    
    Drive ID Circuit
    47
    
    Head Gain Reference PROM and DAC
    48
    
    Actuator
    48
    
    Speed Sensor
    48
  - Read/Write PCA-A2
    48
    
    Dedicated Servo AGC Amplifier
    48
    
    Sampled Servo Switch
    49
    
    Sampled Servo AGC Amplifier
    49
  - Servo PCA-Al
    49
    
    Servo Controller
    49
    
    2-Bit ADC
    50
    
    Dedicated Servo AGC Circuit
    51
    
    Sampled Servo AGC Circuit
    51
    
    Sector Mark Decoder
    51
    
    Dedicated Servo Circuit
    51
    
    Sampled Servo Circuit
    53
    
    Sampled/Dedicated Select Switch
    54
    
    Slew Rate Limiter
    54
    
    Slew Rate Limit Switch
    54
    
    Off-Track Detector
    54
    
    Track Crossing Detector
    54
    
    Fault Latches
    55
    
    Servo Power Amplifier
    55
    
    Amplifier Error Detection
    58
  - Servo System Errors
    59
    
    Track Follower - PLL Errors
    59
    
    Seek Errors
    60
    
    Power Amplifier Error
    60
- Flowcharts
  61
- Read/Write System
  61
  - Head-Disc Assembly A3
    62
    
    Recording Medil.lm
    62
    
    Read Preamplifier/Write Driver Ics
    62
  - Read/Write PCA-A2
    63
    
    Head Select Encoder
    66
    
    Read Chain
    66
    
    Write Chain
    67
    
    Error Reporting
    68
- Spindle Drive System
  68
  - AC Input
    69
  - Spindle Motor BI
    69
  - Primary Power PCA-A8
    69
    
    LINE- Switch
    69
    
    Start Capacitor and Relay
    69
    
    Brake Voltage Source
    70
  - Speed Sensor
    70
  - Servo PCA-/\1
    70
  - Read/Write PCA-A2
    70
  - Power Distribution PCA-A5
    70
- Power Sl.lpply System
  70
  - AC Input Circuit
    70
  - Primary Power PCA-A8
    71
  - Power Supply PCA-A4
    71
    
    Primary Power Selection
    71
    
    Primary Control Circuit
    71
    
    Output Section
    71
    
    Fault Detection and Protection
    71
  - Power Distribution PCA-A5
    71
  - Read/Write PCA-A2
    71
  - Servo PCA-,I\']
    72
  - LED Display
    72
- HDA Air Filtration
  72
  - Recirculating Filter
    72
  - Breather Filter
    72
  - Chemical Filter and Desiccant Chamber
    72
- Drive Air Flow
  72
Chapter 6

111
- Removal and Replacement
  111
- Introduction
  111
- Tools Required
  111
- Illustrations
  112
- Drive Preparation for Service
  112
  - Rear Cover
    112
  - HP-IB Assembly
    112
  - Front Panel
    113
  - Front Cover
    113
  - EPROM Kit, Controller PCA-A6
    113
  - Servo PCA-A I
    113
  - Power Distribution PCA-A5
    114
  - Drive Belt, Motor Pulley
    115
  - Power Supply PCA-A4
    115
  - Start Capacitor Cl
    116
  - Head-Disc Assembly A3
    117
Chapter 7

121
- Adjustments
  121
Introduction

121
Chapter 8 Troubleshooting and Diagnostics

123
- Safety Considerations
  123
- Troubleshooting Strategy
  123
  - Diagnostic Switch
    124
    
    Diagnostic Mode
    124
- CS/80 External Exerciser
  125
- Error Logs
  126
  - Fault Log
    127
- Error Codes
  127
  - Terrors
    128
  - Derrors
    128

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