HP 7942 Manuals

Manuals and User Guides for HP 7942. We have 1 HP 7942 manual available for free PDF download: Service Manual

HP 7942 Service Manual

HP 7942 Service Manual (155 pages)

DISC/TAPE DRIVES

Brand: HP | Category: Storage | Size: 7.19 MB

Table of Contents

Table of Contents
8
Channel Status
40
Control/Status Address Bus
40
Data Request In/Data Request out
40
Data Strobe In/Data Strobe out
40
HP-IB Address Switch
40
HP-IB Interface IC
40
Microprocessor
40
Read/Write Data Bus
40
Select
40
Address Multiplexer
41
Clocks and Control Logic
41
Dma Gate Array IC
41
Exec Eprom
41
Ram
41
Rom Switch
41
Self Test Display
41
Self-Test Switches
41
Buffers
42
Doc Pca-A2
42
- Control/Status Data and Address Buses
  42
- Read/Write Data Bus
  42
- Receiver/Driver
  43
- Transceivers
  43
- GPC Register
  44
- Disc Controller IC
  44
- Phase-Locked Loop IC
  45
- Latch
  45
- Dma Handshake Control
  45
- Clock Generator
  45
- Write Precompensation
  45
Typical HOC Transaction
42
Disc Drive A1
46
- Disc Drive A1/DDC Control Communication
  46
- Input Buffers
  46
- Output Drivers
  46
- Disc Drive A1/DDC Data Communication
  47
- Microprocessor and PLA
  47
- Microprocessor/Pla Control Signals
  47
- Clock Generator
  47
- Head-Disc Module
  47
  - Actuator
    47
  - Recording Medium
    47
  - Read/Write Heads
    48
  - Read Preamplifier/Write Driver IC
    48
  - Servo Head
    48
  - Servo Preamplifier IC
    49
  - Spindle Moto R
    49
- Actuator Lock Driver
  49
- Spindle Speed Control
  49
- Spindle Speed Checker
  49
- Spindle Motor Brake Relay and Relay Driver
  49
- Actuator Servo Control
  49
  - Demodulator
    50
  - Mode Select Switch
    50
    
    Velocity DAC
    50
    
    Tachometer
    50
    
    Current Inverter
    51
    
    On-Peak Detector
    51
    
    Inverter
    51
  - Track--Follow Mode
    51
  - Off-Track Detector
    51
  - Seek Operation
    51
  - Restore to Track 0 Operation
    51
- Read/Write Data Channel
  52
- Head Select and Control Logic
  52
  - Read Chain
    52
    
    Amplifier/Signal Conditioner
    52
    
    Differential Line Driver
    52
  - Wri te Chain
    52
    
    Line Receiver
    52
    
    Transition Generator
    52
    
    Write Current Source
    53
- Self Test
  53
Power Supph' A4
53
- AC Input Circuits
  53
- Swi Tch-MC)De Supply
  54
- Power-On Reset
  54
Service Ini4'Ormation
70
Service Tools
70
Block Diagram
71
Cable Connections
71
FRA Locations
71
Power Distribution
71
Power Supply A4
71
Signal Distribution
71
Signal Notation
71
Self Test
72
Self-Test Controls
72
Sel F Test
73
- Self-Test Display
  73
- Request Status
  77
- Request Status Example
  78
External Exerciser
78
Run Time Error and Fault Reporting
78
Disc Drive Maintenance
81
Tape Drive Maintenance
81
Removal and Replacement
106
Preparation for Service
107
Removal and Replacement
107
- Top Shrouid
  107
- Eprom Kits
  107
- Front Panel
  108
- Appendix A
  108
- Fra5 (Hdc Pca-A5)
  108
- Front Panel
  109
- Fan
  109
- UO-FRA4 (Power Supply Assembly A4)
  110
- UO-Fral (Disc Drive Assembly A1)
  110
- UO-FRA2 (Disc Drive DOC PCA-A2)
  111
- U 1 -FRA2 (Tape Dr I Ve DOC PCA-A2)
  111
Replaceable Parts
117
- 7942A/7946A-02
  144
- OEM Bracket Removal
  146
- Power Supply-07942-60024
  148
- Shunt Block Modification
  152
- Potential Loss of Data-Firmware Bug
  154

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