Sinclair ZX Spectrum Service Manual
Spectrum For Everyone https://spectrumforeveryone.com/
20
4 FAULT DIAGNOSIS AND REPAIR – GETTING STARTED
Introduction
Test Equipment
Modification History
Modifications - Issue 1 Board
Modifications - Issue 2 Board
32k Extension Memory - (16k-48k)
Hitachi vs NEC ROM
4.1 INTRODUCTION
4.1.1 Test Equipment
Sections 4 to 7 are intended as a guide to fault diagnosis and repair of the ZX Spectrum. 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.
Specification/Manufacturer
Oscilloscope with oscilloscope probe (x10)
Variable power supply unit
With RECORD and PLAYBACK facilities
Double-sided adhesive tape
12mm and 6mm wide, Tesafix 959 (BDF TESA), or
3M equivalent
Engineers who are already familiar with the Sinclair ZX81 will find some similarities in the ZX Spectrum.
The Spectrum, however, is a more sophisticated device with colour and sound circuitry.
The ZX Spectrum is supplied with either 16k or 48k of on-board RAM. The 16k version is wired so that it
can be expanded to 48k by the addition of a number of appropriate plug-in ICs. For details of the memory
upgrade, see section 7.3.
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