HP 7957A Manuals

HP 7957A Manuals

Manuals and User Guides for HP 7957A. We have 1 HP 7957A manual available for free PDF download: Hardware Manual

HP 7957A Hardware Manual

HP 7957A Hardware Manual (101 pages)

HP Disc Drives Hardware Support Manual

Brand: HP | Category: Storage | Size: 5.07 MB

Table of Contents

Table of Contents
7
Chapter 1 Page

8
- General Information
  13
- Introduction
  13
- Scope of Manual
  13
- Options
  14
- Related Manuals
  14
- Characteristics
  14
Chapter 2

17
- Interface Information
  17
- Supported I~SDI Features
  17
- Drive Interface Characteristics
  17
- Interface Signals
  17
- Drive Operating Features
  24
  - Drive/Head Selection Sequence
    24
  - Media Fc)Rmat
    28
    
    Sector Format
    28
    
    Sector Offset
    28
- CS/80 Command Set Implementation
  28
Chapter 3 Theory of Operation

33
- CS80/ESDI Controller [CEC] PCA-A2
  33
- Transfers
  34
- Disc Format
  34
- Sparing
  37
  - Sequencc
    37
  - Sector Si)Aring
    37
  - Track Sparing
    37
- Errors
  38
  - Error Definition
    38
  - Error Logs
    38
  - Error Detection and Correction
    38
- Disc Drive :PCA-Al
  39
  - Drive Mechanics
    39
  - Preamplifier Board
    41
  - Motor Control Board
    41
  - Device Electronics Board
    41
- Read/Write Functional Description
  41
  - Write Channel
    41
  - Read Channel
    42
  - Read/Reference Clock Multiplexer
    42
    
    Read/Write Head Select
    42
- Power Supply Assembly PCA-A3
  43
  - AC Input Circuits
    43
  - Switch-Mode Supply
    43
  - Power-On Reset
    44
- Summary of Write Data Operation
  44
- Summary of Read Data Operation
  44
- CEC Functional Theory
  44
  - Bus Structure
    44
  - Microprocessor Data Bus
    45
  - Control, Clock Generator and Stretcher Circuit
    46
  - Disc Data Controller (DDC) IC
    46
  - Remote DMA Transfer
    47
  - Esdi Pal
    48
    
    Write Gate and Address Mark Enable Delay Circuit
    48
  - Error Correction
    48
  - Format
    49
  - HP-IB Interface IC
    49
  - Buffers
    49
  - DMA Bus Arbiter
    50
    
    Local DMA Transfers
    50
    
    Microprocessor Transfers
    50
    
    Remote DMA Transfers
    50
  - EEPROM (When Used)
    50
  - LED Control
    51
Chapter 4

55
- Service Information
  55
- Introduction
  55
- Service Tools
  56
- PCA Locations
  56
- Cable Connectors
  56
- Signal Distribution
  56
- Power Distribution
  56
- Signal Notation
  62
- Block Diagram
  62
- Test Points
  62
- CS/80 Implementation Information
  62
- Self-Test Controls
  64
  - Fault/On Line Indicator
    64
- Internal Diagnostics
  64
- Self Test
  66
  - Microprocessor Self Test
    66
  - RAM Self Test
    66
  - ROM Checksum Test
    66
  - HP-IB Interface IC Loopback Test
    66
  - Buffer Test
    66
  - Select a Drive
    66
  - Command Complete
    66
  - ESDI Status Check
    66
  - Reset Attention
    66
  - Read Write ECC Test
    68
  - Build Spare Tables
    68
  - Copy EEPROM Logs to Self Test Cylinder (for Drives with EEPROM Only)
    68
  - Finish HP-IB Interface IC Initialization
    68
  - Request Status
    76
  - Request Status Example
    77
- Utilities
  77
  - Run Time and Fault Logs (Media Based)
    78
  - Run Time and Fault Logs (EEPROM Based)
    78
  - Fault Status Bytes
    80
  - Run Time Sectors Read Count (Media and EEPROM Based)
    81
  - Error Rate Test (ERT) Log
    82
  - Error Byte Description
    83
  - CS/80 no Execution Message Utilities
    84
    
    Clear Logs
    84
    
    Preset
    84
    
    Faults/Errors During Error Rate Testing
    84
  - CS/80 Send Message Utilities
    85
    
    Read Fault Log
    85
    
    Read Run Time Error Log
    85
    
    Read Error (ERT) Log
    86
    
    Measure Seek Time
    87
    
    Read Spare Table
    87
    
    And Read Full Sector
    88
    
    Servo Test
    88

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