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R140
Service manual
Acorn R140 Service Manual
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Table Of Contents
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Contents
Table of Contents
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Table of Contents
Contents
Technical Specification
Dimensions
Optional Equipment
Econet Interface
Expansion Cards
Screen Modes
Electrical Safety
Packaging and Installation
System Description
Introduction
General
The I/O System
System Architecture
Non-IOC Devices
System Memory Map
The Sound System
Hard Disc Drive and Interface
Read Data Path
Data Separator
Write Data
Format
Disassembly and Assembly
Removing the Main PCB
Removing the Top Cover
Floppy Disc Drive
Power Supply Unit
Front Moulding Assembly
Fan Assembly
Main Unit Assembly
Keyboard
Mouse
Fault Finding Information
Test Equipment Required
Checking a 'Dead' Computer
No Sound
Functional Testing
General Test Procedure
Removing the Top Cover of the Computer Unit
The Test Disc
Performing Soak Tests
Repairing Faults
Disconnecting the Equipment
Packing
Main PCB Functional Test
Setting up
Connecting up the Equipment
Running the Tests
Hard Disc Drive Tests
Hard Disc Formatter
Hard Disc Verifier
Hard Disc Soak Test
Copying HFORM Onto the Hard Disc
Quitting the Soak Test
Other Tests
Memory Test
Loudspeaker
Battery Backed RAM
Standard Colour Monitor
High Resolution Mono Monitor
Floppy Disk Drive
Serial Port
Printer
Completing the Tests
Keyboard Test
Equipment Required
Running the Test
Keys Stuck
Leds
Keys
Expansion Tests
Running the Expansion Tests
Dual Floppy Disc Test
ROM Expansion Card Test
I/O Expansion Card Test & MIDI Upgrade Test
MIDI Expansion Card Test
Setting up the MIDI Expansion Cards
Backplane Tests
Testing the Backplane
Replacing the Backplane
Removing the Backplane
Main PCB Fault Diagnosis and Repair
Tools Required
Repairing a 'Dead' Computer
Video Failure
Test Roms
Main Memory Test
Repetitive Reset Test
Repairs Following Functional Testing
Memory
Monitor Screen
Keyboard and Mouse
Parts List
Upgrading
Expansion Card Installation Instructions
Fitting the Expansion Card
Floating Point Co-Processor
Installation and Operation Guide
Installing the Hardware
Removing the Cover of the Computer
Fitting the Co-Processor Card
Installing the RISC os Software Support Code
Straightening the Backplane
Reassembling the Computer
Loading the Floating Point Module
RISC Software Support Code Installation
Possible Problem Areas
Checking the Co-Processor
Second Floppy Disc Drive Installation
Fitting the Upgrade
Removing the Front Moulding Assembly
Data Cable Details
Installing the New Drive
Front Moulding Assembly Details
Removing/Inserting LED Wires in the Led/Speaker Connector
Main PCB Links and Test Points
Main PCB Plugs
400/1 RAM Upgrade
Fitting the Kit
Insert the Ics
Disassemble the Computer
Change the Link Settings
Attach the Serial Number Label
Reassemble the Computer
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