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HP-87
Service manual
HP -87 Service Manual
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Table Of Contents
198
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Contents
Illustrations List
Tables List
General Information
Product Description
Specifications
Identification
Safety Consideration
Servicing
Using this Manual
Recommended Tools
Troubleshooting
System Overview
Block Diagram
Troubleshooting Overview
Keyboard Assembly Propped up View
Removing and Inserting Socketed Ics
Setup
Socketed Ics
Initial Troubleshooting
Ics Indicated by {CPU BAD? N or RAM BAD!} Message
No Turn-On
Power Supply, PWO, and Clock Test Points
Service Roms
Clock Waveforms
Self-Test
Running a Service ROM Test
System Self-Test Results
Error Messages
Service ROM Tests
Troubleshooting with the System Test
Results of the System Test
RAM/ROM Test Diagnosis
Beeper Test Diagnosis
CRT Test Diagnosis
Timer Test Diagnosis
Keyboard Test Diagnosis
Service ROM IC Messages
Troubleshooting with the Cycle Test
How to Run the Cycle Test
Using the Heat Test
Results of the Heat Test
Troubleshooting with the CPU Test
Results of the CPU Test
Troubleshooting the Control and Bus Lines
Troubleshooting with the RAM Test
Control of Bus Line Failure Isolation
Results of the RAM Test
Troubleshooting with the ROM Test
Results of the ROM Test
Troubleshooting with the External ROM Test
Results of the External ROM Test
Keyboard Troubleshooting
How to Run the Keyboard Test
Enhancement ROM Codes
Results of the Keyboard Test
Key Sequence for Keyboard Test
No Key Entry
Wrong Character Entered
Key Stuck
Mnemonics and Key Lines for Keys Expected
Key(S) Corresponding to Character Entered
Troubleshooting with the Timer Test
Results of the Timer Test
Troubleshooting the CRT
Results of the CRT Test
CRT Test Patterns
CRT Adjustments
Checking Whether the Display Is Pincushioned
CRT Test Pattern Overlay in Position
CRT Adjustment Procedures
Skew
Horizontal Centering
Size
Vertical Centering and Height
Power Supply Troubleshooting
Focus
PWO and Clock Failure Isolation
Troubleshooting with the Short HP-IB Test
Results of the Short HP-IB Test
Troubleshooting with the Long HP-IB Test
Results of the Long HP-IB Test
Troubleshooting with the External RAM Test
Results of the External RAM Test
Troubleshooting with the Beeper Test
Results of the Beeper Test
Using the QA Test
Results of the QA Test
Disassembly and Reassembly
Removing and Tightening Screws
Cable Interconnections
Special Handling for Keyboard Assembly Cables
Connecting a Cable
Removing a Trapped Cable
Aligning Cable Contacts
Cable Connected Properly
Cable Misaligned
Cable Connected with Edge Folded over
Replacing Assemblies and Case Parts
Separating the Top Case from the Bottom Case
Replacing the Keyboard Assembly
Replacing a Keycap
Keyboard View
Replacing the Space Bar
Replacing a Plunger and Spring
Replacing the [Caps Lock] Key Mechanism
Replacing Key Contacts
Replacing a Keyboard Hinge
Cleaning Key Contacts
Replacing the Logic One PCA
Replacing the Logic Two PCA
Replacing the Power Supply PCA
Replacing the CRT PCA
Replacing the CRT Assembly
Replacing the Back Panel Assembly
Replacing the I/O PCA
Replacing the HP-IB PCA
Replacing Parts of the Top Case Assembly
Replacing Parts of the Bottom Case Assembly
To Replace the Brightness Control
To Replace the Power Light
Attaching the Top Case to the Bottom Case
Replaceable Parts
Keyboard Assembly Exploded View
Exploded Diagrams
Schematic Diagrams
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Table of
Contents
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Table of Contents
Troubleshooting
Troubleshooting
22
Troubleshooting overview
28
Initial troubleshooting
34
Troubleshooting with the system test
47
Troubleshooting with the cycle test
53
Results of the Heat Test
54
Results of the CPU Test
55
Troubleshooting with the RAM test
56
Results of the RAM Test
57
Results of the ROM Test
58
Keyboard troubleshooting
60
Troubleshooting with the timer test
84
Power supply troubleshooting
99
Troubleshooting with the short HP-IB test
104
Troubleshooting with the Long HP-IB Test
105
Results of the Long HP-IB Test
106
Troubleshooting with the beeper test
108
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Summary of Contents for HP HP-87
Page 3
HP Computer Museum www.hpmuseum.net For research and education purposes only.
This manual is also suitable for:
Hp-75
Hp-75d
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