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HP Portable PLUS Service Manual
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Also See for Portable PLUS
:
Getting started
(53 pages)
,
Installation instructions manual
(32 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Printing History
Table of Contents
Figure Title Page
Table Title Page
Chapter 1 General Information
Description
Portable PLUS Configurations
Specifications
Portable PLUS Specifications
Identification
Accessories
Test Equipment
Recommended Tools and Equipment
Chapter 2 Site Preparation Requirements
Chapter 3 Installation and Configuration
Preparation
Installation
Functional Verification
Configuration
Chapter 4 Preventive Maintenance
Chapter 5 Functional Description
Introduction
Portable PLUS Block Diagram
Central Processing Unit (CPU)
Peripheral Processing Unit (PPU)
CPU Memory Map
Address/Control Circuit
Keyboard Interface
Keyboard Assembly
Liquid-Crystal (LCD) Interface
Liquid-Crystal Display
HP-IL Interface
Serial (RS-232-C) Interface
Serial Interface Connector Pin Assignments
Video Interface
Video Interface Connector Pin Assignments
Modem Interface
Direct-Connect Modem (Dealer-Installed Option)
Modem Interface Connector Pin Assignments
Clock/Ready Circuit
Power Supply
Battery
Battery Charger
Power-Up Routine
LCD Negative Supply
VLCD Switch Circuit
VFETBIAS Supply Circuit
Variable Control of the VFETBIAS Supply
Miscellaneous LCD Negative Supply Circuitry
RS-232-C Supply Voltages
Voltage Doublers
11-Khz Oscillator
System ROM and Built-In RAM
Configuration EPROM
Plug-In Ports
System Extensions
Memory (RAM) Drawer
Software (ROM) Drawer
Video Interface
Snalinkj3270 Software Drawer
Chapter 6 Removal and Replacement
Introduction
Disconnecting the Battery
Removing the Battery Cover
Removing the Battery Terminal Cover
Moving the Battery Jumper to off
Disconnecting the Battery
Removing the Battery
Separating the Case
Removing the Bottom Screws
Unplugging the Top Case Cables
Separating the Case
Replacing the Pcas
Removing the Keyboard Module
Removing the Hinge Cover
Removing the Keyboard Top Nuts
Removing a Keyswitch
Removing the Keyboard Module
Removing the Display Module
Removing a Keycap
Removing the Display Screws
Removing the Clutches and Display Cable
Removing Ics
Replacing Plug-In Drawer Pcas
Chapter 7 Adjustments
Chapter 8 Troubleshooting
Overview
Troubleshooting Procedures
Comparison of Diagnostic Tests
Troubleshooting Procedures
Main Diagnostic Procedure
Startup Problems
Diagnostic Test Results
System RAM Diagnostic Identification
Repair Procedures
Software Drawer Jumper Configurations
Repairing the Power Supply
Repairing the Processors
Repairing the Display
Repairing the Keyboard
Repairing the Serial Interface
Repairing the Modem
Using Oscilloscope Routines
Diagnostic Module Scope Routines
Disc-Based Scope Routines
Selecting Oscilloscope Routines
Burning an EPROM
Testing the Recharger
Testing the Snalinkj3270 Software Drawer
Chapter 9 Replaceable Parts
Chapter 10 Reference Information
Introduction
Diagnostic Test Results
Descriptions of Diagnostic Tests
System Test
CPU Test
ROM Test
RAM Test
LCD Test
Keyboard Test
HP-IL Test
Modem Test
RS-232-C Test
Beeper Test
Timer Test
Sleep Test
Service References
Service Equipment
RS-232-C Test Connector
Snalink/3270 Test Board
Diagnostic Module
Chapter 11 Product History
Introduction
Backdating History
Reference Information for a and B Versions
Troubleshooting a and B Versions
Replaceable Parts for a and B Versions
Diagrams for a and B Versions
Reference Information for Early C/D/E/F Versions
Removal and Replacement for Early E/F Versions
Troubleshooting Early C/D/E/F Versions
Replaceable Parts for Early C/D/E/F Versions
Chapter 12 Diagrams
Software (ROM) Drawer PCA Component Location Diagram
Diagrams
Keyboard Rows and Columns
French Keyboard Layout
German Keyboard Layout
Italian Keyboard Layout
Swiss-French Keyboard Layout
Swiss-German Keyboard Layout
Dutch Keyboard Layout
Danish Keyboard Layout
Swedish Keyboard Layout
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Table of Contents
Troubleshooting
Chapter 8 Troubleshooting
67
Troubleshooting Procedures
69
Reference Information for A and B Versions
148
Reference Information for Early C/D/E/F Versions
152
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