AREA SYMPTOM ACTION
Colour tuning VRl or VR2 d.c. Change IC14.
faults, (cont'd) shifts IC14 pin 13
waveform.
Alternate dark
lines
Change
IC14.
on screen.
No colour after
trimming TC2:
ICH pin 17 not 1. Check crystal X2.
oscillating 2. Change ICH.
3. Change X2.
ICH pin 17 1. Check for broken track,
oscillating but 2. Change TC2.
fails to tune. 3. Change ICH.
ICH pin 17 output 1. With 'Sinclair' logo on
correct but still screen ICH pin 2 and
no colour (boards ICH pin 4 should be as
at all Issue Nos). follows:
2. If ICH pins 2 and 4
are correct, change
modulator.
Colour faults Pin screen. Change crystal X2.
(Issue 1 - Issue 3
boards.
Blue haze around If untunable Issue 1 and
'Sinclair1
*-™°'
issue
2
boardsj
chage
ICH.
Screen too yellow. Change ICH.
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