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7942
Service manual
HP 7942 Service Manual
Disc/tape drives
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Channel Status
Control/Status Address Bus
Data Request In/Data Request out
Data Strobe In/Data Strobe out
HP-IB Address Switch
HP-IB Interface IC
Microprocessor
Read/Write Data Bus
Select
Address Multiplexer
Clocks and Control Logic
Dma Gate Array IC
Exec Eprom
Ram
Rom Switch
Self Test Display
Self-Test Switches
Buffers
Doc Pca-A2
Control/Status Data and Address Buses
Read/Write Data Bus
Receiver/Driver
Transceivers
GPC Register
Disc Controller IC
Phase-Locked Loop IC
Latch
Dma Handshake Control
Clock Generator
Write Precompensation
Typical HOC Transaction
Disc Drive A1
Disc Drive A1/DDC Control Communication
Input Buffers
Output Drivers
Disc Drive A1/DDC Data Communication
Microprocessor and PLA
Microprocessor/Pla Control Signals
Clock Generator
Head-Disc Module
Actuator
Recording Medium
Read/Write Heads
Read Preamplifier/Write Driver IC
Servo Head
Servo Preamplifier IC
Spindle Moto R
Actuator Lock Driver
Spindle Speed Control
Spindle Speed Checker
Spindle Motor Brake Relay and Relay Driver
Actuator Servo Control
Demodulator
Mode Select Switch
Velocity DAC
Tachometer
Current Inverter
On-Peak Detector
Inverter
Track--Follow Mode
Off-Track Detector
Seek Operation
Restore to Track 0 Operation
Read/Write Data Channel
Head Select and Control Logic
Read Chain
Amplifier/Signal Conditioner
Differential Line Driver
Wri te Chain
Line Receiver
Transition Generator
Write Current Source
Self Test
Power Supph' A4
AC Input Circuits
Swi Tch-MC)De Supply
Power-On Reset
Service Ini4'Ormation
Service Tools
Block Diagram
Cable Connections
FRA Locations
Power Distribution
Power Supply A4
Signal Distribution
Signal Notation
Self Test
Self-Test Controls
Tape Drive FAULT Indicator
Tape Drive BUSY Indicator
Disc Drive FAULT/ON LINE Indicator
Sel F Test
Self-Test Display
Request Status
Request Status Example
External Exerciser
Amigo Clear (AMCLEAR)
Cancel Transaction (CANCEL)
Test HP-IB Channel (CHANNEL)
Channel Independent Clear (CICLEAR)
Clear Logs (CLEAR LOGS)
Describe Selected Unit (DESCRIBE)
Perform Internal Diagnostics (DIAG)
Output Error Rate Test Log (ERT LOG)
Exit Program (EXIT)
Output Fault Log (FAULT LOG)
Initialize Media (INIT MEDIA)
Update Device Logs (PRESET)
Request Status (REQSTAT)
Perform Read-Only Error Rate Test (RO ERT)
Output Run Log (RUN LOG)
Spare Sector (SPARE)
Output Spare Table (SPARE TABLE)
Output Device Table (TABLES)
Perform Servo Test (SERVO)
Set Unit Number (UNIT)
Run Time Error and Fault Reporting
Disc Drive Maintenance
Tape Drive Maintenance
Removal and Replacement
Preparation for Service
Removal and Replacement
Top Shrouid
Eprom Kits
Front Panel
Appendix A
Fra5 (Hdc Pca-A5)
Front Panel
Fan
UO-FRA4 (Power Supply Assembly A4)
UO-Fral (Disc Drive Assembly A1)
UO-FRA2 (Disc Drive DOC PCA-A2)
U 1 -FRA2 (Tape Dr I Ve DOC PCA-A2)
Replaceable Parts
7942A/7946A-02
OEM Bracket Removal
Power Supply-07942-60024
Shunt Block Modification
Potential Loss of Data-Firmware Bug
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HEWLETT-PACKARD
HP 7942 AND HP 7946 DISC/T APE DRIVES
SERVICE MANUAL
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