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Sinclair ZX Spectrum 128 - 4 Fault Finding and Repair; Introduction; Test Equipment

Sinclair ZX Spectrum 128
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Sinclair ZX Spectrum Service Manual
Spectrum For Everyone https://spectrumforeveryone.com/
25
4 FAULT FINDING AND REPAIR
Introduction
Test Equipment
Fault Diagnosis
Techniques
Power Supply Unit
Initialisation
Symptomatic Faults
Repair
Illustrations
Test Oscillograms
4.1 INTRODUCTION
4.1.1 Test Equipment
Section 4 is intended as a guide to fault diagnosis and repair of the SPECTRUM 128. it is assumed that
users have a reasonable knowledge of electronic servicing, theory and standard fault-finding techniques
and have access to the test equipment and tools required to carry out the task. The table below contains
a list of the minimum recommended test equipment and materials.
Equipment
Specification/Manufacturer
Storage Oscilloscope with x10 probe
Rise Time: 0.02us/cm
Variable power supply unit
0 to 30V dc
Mono cassette recorder
With Record and Playback facilities
Mains extension lead
‘Safebloc’ type
Multimeter
General purpose
Colour Television and Monitor
Open Market
ZX Printer
Sinclair
Test tape

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