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HP-75
Service manual
HP -75 Service Manual
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Service manual
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Manual
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
General Information
Replaceable Parts
Product Description
Functional Description
2=-2 CPU Block Diagram
Signal Descriptions
Display Waveforms
Card Reader
Clock/Keyboard/Rtc
Keyboard Layout Diagram
HP-IL Bit Encoding
HP-IL Circuit
Power Supply
Card Reader Description
Magnetic Card
Magnetic Card Layout
Card Reader IC Electronlcs
Data Control
Card Reader Block Diagram
System Bus Communication . 2=20
Analog Circuitry
Input/Variable Gain Stage
Bandpass/Fixed Gain/Offset Correctlng Stage
Read Sense Amplifier Diagram 2=-22
Schmitt Trigger
Inverter . 2=23
Peak Detector
Automatic Gain Control . 2=23
Power Supply Description
DC-To-DC Converter Circuit
Battery Charging Circuit
Display Reference Circuit
Buzz Circuit . E
System Timing
PH1 and PH2 Awake Timing
Clock Control Block Diagram
CPU Control Signals
Control Line Timing
Cpu Data Bus
LMA Direct Address Timing
Data Read/Write Timing . 2=39
Indirect Address Timing
Priority Structure
Interrupt Timing . 2=-42
Power on Sequence
Interrupt Acknowledge
Memory Structure . 2=-45
Disassembly and Reassembly
Introduction
Recommended Tools
Removing the Back Case
Removing the Power Supply/Ram PCA
Assembling the Logic and Display Assemblies . 3=17
Installing the Power Supply/Ram PCA
Installing the Back Case
Diagnostic Rom
Introduction
Description of the Dlagnostlc ROM
Troubleshooting with the Diagnostic ROM
Auto Test
Individual Tests
CPU Test
ROM Test
Keyboard Test
Clock Test E E E E E E E E E E E E E E E E E E E
Deep Sleep Test
Battery Level Detect Test E E E E E E E E E E E E
LCD Driver Test
LCD Controller Test
LCD Controller Characters
HP-IL Test
MAR Test E L
Beep Test
Non-Destructive RAM Test N L
Light Sleep Tests
Key Reassignments
Troubleshooting and Testing
Initial Preparation
Repair Procedures
Leakage Current Test
Power Supply Test
Card Reader Test
Operational Verification
Diagnostic ROM Error Messages
Error Code
Test: Keyboard
Test" Program Listing
HP 82001B Battery Pack
Battery Troubleshooting
Specification
Rechargers
Ordering Information
HP-75 Portable Computer Replaceable Parts
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PORTABLE COMPUTER
SERVICE MANUAL
[fifi
HEWLETT
PACKARD
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Table of Contents
Troubleshooting
Troubleshooting with the Diagnostic ROM
82
TROUBLESHOOTING AND TESTING
97
Battery Troubleshooting
118
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