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9895A
Service manual
HP 9895A Service Manual
Flexible disc memory
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Service manual
(113 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Specifications
Safety Considerations
Chapter 1: General Information
Introduction
General Description
Service Support Package
1-1. PSP Contents
FSI Contents
Options
Equipment Supplied
Accessories Available
Installation
Power Requirements
Line Voltage Selector Switches
Fuses
Addressing
Bus Address Selector Switch
Setting the Drive Number
Self-Test
LED Display
Self-Test Functions
9895A Installation Procedure
Flexible Disc Use
Introduction
Disc Loading
Disc Handling Precautions
Write Protect
Write Enable Method
Operator Controls
Reset Caused by Line Voltage Reduction
Chapter 2: Theory of Operation
Introduction
Controller Module Theory of Operation
General Description
Controller Interface to HP-16 (PHI Chip)
Processor and Memory
Read Operation
Write Operation
Error Detection
Seek Operation
Drive Theory of Operation
Introduction
General Description
Control, Status and Data Lines between the Controller and Drive Electronics
Power Supply Theory of Operation
Introduction
General Description
Functional Characteristics and Communication Protocol
Format Similarities
Track Format
Format Differences
Hewlett-Packard Standard Sector Recording Format
Chapter 3: Maintenance
Introduction
Standard Test Equipment
Special Tools
Disassembly Procedures
Introduction
Cover Panels
Controller Module
Drive Module
Fan Compartment
Controller Board Guide Adjustment
Power Module
Drive Electronics Board
Drive Motor Assembly
Front Plate
Maintenance
Introduction
Troubleshooting
Detector Functions
Adjustment Test Points
Differential Read Signal for Entire Track
Differential Read Signal for Portion of Outer Track
Corrective Maintenance Procedures
Index-To-Burst Check and Adjustment
Head-Unload Clearance
Adjustment Reference List
Radial Alignment
Index Pulse to Write-Splice Bit Timing
Drive Electronics Board Layout Diagram
Door-Closed Switch Adjustment
Track 0 Optical Sensor Adjustment
Track 0 Optical Sensor Output
Disc Ejector
Stepper Motor Mount Screws and Ejector Assembly
Ejector, Latch and Latch Block
Disc-Load-Pad Adjustment
Head-Unload Clearance
Load-Pad Adjustment
Line Frequency Conversion Procedure
System Exerciser
Diagnostic Routines
PROM to ROM Controller Board Re-Configuration
Chapter 4: Status Display Board Diagnosis
Introduction
General Description of Diagnosis Method
Self-Test Initiation
Test Selection
Default Self-Test
Read-Only Self-Test
Write Read Self-Test
Using the Status Display Board for Failure Analysis
Obtaining Test Results from LED Display
09895-66506 Status Display Board
Error Rate Testing with the Status Display Board
Error Codes
Chapter 5: Replaceable Parts
Introduction
Replaceable Parts
Appendix A: HP 9895A Disc Memory Command Set
Introduction
Command Compatibility
Command Sequences
Parallel Poll Response
Cylinder and Track Numbering
Target Addressing
The D Bit
HP and IBM Formats
Loading of the Recording Heads
Holdoffs
Command Execution Checks
Commands
Command Table
Sense Commands
Identify
Dsj
Read Self-Test Results
Read Loopback Record
Request Status
Request (Logical) Disc Address
Request (Physical) Disc Address
Control Commands
Universal or Selected Device Clear
Clear
Initiate Self-Test
Write Loopback Record
Download
Seek
End
Door Lock
Door Unlock
Disc Read Commands
Buffered Read
Unbuffered Read
Verify
Buffered Read Verify
Unbuffered Read Verify
Cold Load Read
ID Triggered Read
Disc Write Commands
Buffered Write
Unbuffered Write
Initialize
Format
Appendix B: Error Messages
Appendix C: Accessory Installation Gulde
Rack Mount Installation Kit
Removing Front Panel
Front Panel Removed
Controller Installation Kit
Accessory Drive Installation Kit
Bottom View of Drive Location
Top View of Drive Location
LED Location
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r-=-===========~
SERVICE MANUAL
9895A Flexible Disc Memory
Hewlett-Packard Greeley Division
3404 East Harmony Road, Fort Collins, Colorado 80525
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