Sinclair Research ZX Spectrum - Page 2

- INTRODUCTION
This manual is for use by authorised SINCLAIR
dealers, engineers and representatives as a guide
to rectifying faults on the SINCLAIR ZX SPECTRUM
personal computer.
The manual refers principally to the Issue 2 and
Issue 3 Spectrums but provides a background to the
Issue 1 version in the section dealing with
modification history.
Basic knowledge of ZX SPECTRUM operating
procedures is assumed as is knowledge of current
workshop practice relating to microcomputers.
NOTE: Essential modifications are required
on some Issue 2 Spectrums. Refer to
Modification History (Section 4) and
implement as necessary.