Sinclair ZX Spectrum 128 Service Manual

Sinclair ZX Spectrum Service Manual
Spectrum For Everyone https://spectrumforeveryone.com/
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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

Sinclair ZX Spectrum 128 Specifications

General

Brand	Sinclair
Model	ZX Spectrum 128
Category	Desktop
Language	English