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7957A
Hardware manual
HP 7957A Hardware Manual
Hp disc drives hardware support manual
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Contents
Table of Contents
Bookmarks
Table of Contents
Table of Contents
Chapter 1 Page
General Information
Introduction
Scope of Manual
Options
Related Manuals
Characteristics
Chapter 2
Interface Information
Supported I~SDI Features
Drive Interface Characteristics
Interface Signals
Drive Operating Features
Drive/Head Selection Sequence
Media Fc)Rmat
Sector Format
Sector Offset
CS/80 Command Set Implementation
Chapter 3 Theory of Operation
CS80/ESDI Controller [CEC] PCA-A2
Transfers
Disc Format
Sparing
Sequencc
Sector Si)Aring
Track Sparing
Errors
Error Definition
Error Logs
Error Detection and Correction
Disc Drive :PCA-Al
Drive Mechanics
Preamplifier Board
Motor Control Board
Device Electronics Board
Read/Write Functional Description
Write Channel
Read Channel
Read/Reference Clock Multiplexer
Read/Write Head Select
Power Supply Assembly PCA-A3
AC Input Circuits
Switch-Mode Supply
Power-On Reset
Summary of Write Data Operation
Summary of Read Data Operation
CEC Functional Theory
Bus Structure
Microprocessor Data Bus
Control, Clock Generator and Stretcher Circuit
Disc Data Controller (DDC) IC
Remote DMA Transfer
Esdi Pal
Write Gate and Address Mark Enable Delay Circuit
Error Correction
Format
HP-IB Interface IC
Buffers
DMA Bus Arbiter
Local DMA Transfers
Microprocessor Transfers
Remote DMA Transfers
EEPROM (When Used)
LED Control
Chapter 4
Service Information
Introduction
Service Tools
PCA Locations
Cable Connectors
Signal Distribution
Power Distribution
Signal Notation
Block Diagram
Test Points
CS/80 Implementation Information
Initialize Media Command
Initiate Diagnostics Command (DIAG)
CS/80 Describe Command Response
Self-Test Controls
Fault/On Line Indicator
Internal Diagnostics
Self Test
Microprocessor Self Test
RAM Self Test
ROM Checksum Test
HP-IB Interface IC Loopback Test
Buffer Test
Select a Drive
Command Complete
ESDI Status Check
Reset Attention
Read Write ECC Test
Build Spare Tables
Copy EEPROM Logs to Self Test Cylinder (for Drives with EEPROM Only)
Finish HP-IB Interface IC Initialization
Request Status
Request Status Example
Utilities
Run Time and Fault Logs (Media Based)
Run Time and Fault Logs (EEPROM Based)
Fault Status Bytes
Run Time Sectors Read Count (Media and EEPROM Based)
Error Rate Test (ERT) Log
Error Byte Description
CS/80 no Execution Message Utilities
Clear Logs
Preset
Faults/Errors During Error Rate Testing
CS/80 Send Message Utilities
Read Fault Log
Read Run Time Error Log
Read Error (ERT) Log
Measure Seek Time
Read Spare Table
And Read Full Sector
Servo Test
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HEWLETT - PACKARD
HP 7957 A AND HP 7958A DISC DRIVES
HARDWARE SUPPORT MANUAL
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