SECTION 4
FAULT DIAGNOSIS AND REPAIR
Sub-Section LIST OF CONTENTS Page No.
1 Introduction 4.2
Test Equipment 4.2
Modification History 4.3
Modifications - Issue 1 Board 4.4
Modifications - Issue 2 Board 4.5
32k Extension Memory - (16k-48k) 4.5
Hitachi vs NEC ROM 4.6
2 Fault Diagnosis 4.6
Techniques 4.6
Power Supply Unit 4.7
Initialisation 4.7
Memory Check 4.8
Keyboard Structure 4.10
Fault-Finding Guide 4.11
3 Repair 4.19
4 16k to 48k Upgrade 4.19
Integrated Circuits/Link Settings 4.19
Issue 2 Board 4.20
Issue 3 Board 4.20
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