Sinclair ZX Spectrum Service Manual

Sinclair ZX Spectrum Service Manual
Spectrum For Everyone https://spectrumforeveryone.com/
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6.6 COLOUR FAULTS (ISSUE 1 - ISSUE 3 BOARDS)
6.6.1 Pin screen
Change crystal X2
6.6.2 Blue haze around `Sinclair` logo
If untunable (Issue 1 and Issue 2 boards) change IC14
6.6.3 Screen too yellow
Change IC14
6.6.4 Intermittent colour
Change TC2 (Issue 1 and Issue 2 boards)
Change IC14
6.6.5 Red, Blue or Green `Sinclair` logo
Change IC1
6.6.6 Washed out colours
Check TR2
6.7 KEYBOARD FAULTS
6.7.1 KB1 fault
Check for short on 2 or more of the 5 tracks
Change membrane
6.7.2 KB2 fault
Check for short on 2 or more of the 8 tracks
Change membrane
6.7.3 Dead keyboard
Change IC1
6.7.4 Wrong keyboard response
Change IC1
6.7.5 Keyboard response too fast
Change IC1
6.8 REGULATOR COIL
6.8.1 Coil excessively noisy
Change coil

Sinclair ZX Spectrum Specifications

General

Brand	Sinclair
Model	ZX Spectrum
Category	Desktop
Language	English