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Section 4 - Fault Diagnosis and Repair

Section 4 - Fault Diagnosis and Repair

Oct 21, 2015

 

Contents :

 

Figures :

 

Tables :

 

Contents :

 

Figures :

 

Tables :

4.1

Introduction To Fault Diagnosis

4.1

JEDEC Modification Solder Side of Board

4.1

Power supply voltages

 

Test Equipment

4.2

JEDEC Modification Component Side of Board

4.2

Typical voltages

 

Modification History

 

 

4.3

Typical waveforms and voltages

4.2

Fault Diagnosis

 

 

4.4

Coma voltages

 

Techniques

 

 

 

 

 

Power Up

 

 

 

 

 

Keyboard

 

 

 

 

 

128k RAM Packs

 

 

 

 

4.3

Repair

 

 

 

 

 

General

 

 

 

 

 

EPROM Substitution

 

 

 

 

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