29
29A-SX1
29A-SX5
29A-SX8
SET Sub-
colour.
Check IC801
and its
peripherals.
TROUBLE SHOOTING TABLE (Continued)
D
COLOUR PRODUCED
Colour in B/W mode.
Colour control circuit detective.
Colour saturation control does not
work.
Fix control to coloured system.
Turn colour control to minimum.
Does colour disappear?
Turn up and down colour control.
Does colour gain go up and
down?
Can the sub-colour be readjusted
in service mode?
Turn on colour system forced
switch. Does colour appear?
APG circuit:
Check IC801
and its
peripherals.
Yes Yes
White
balance:
Check RGB
output circuit
of IC801.
Check IC801.
No
Yes No
Check IC801.
Check D1603
and its
peripherals.
Yes No
NTSC3.58:
Check X801
pin (10) of
IC801 and their
peripherals.
PAL, SECAM,
NTSC4.43:
Check X800 pin
(8) of IC801 and
their peripherals.
No
Check IC800,
IC802, IC803
and their
peripherals.
YesNo
No
Is chroma input level pin (13) of
IC801 proper?
Ref. value: 100 ~ 500mVp-p.
Yes
Fix control to
coloured system.
No
Is SCP signal waveform at pin (2)
of IC801 proper?
Are signal waveforms at TP901 and TP902
proper?
Is FBP signal waveform at pin (25)
of IC801 proper?
Yes
Yes
Check Q402, IC5400,
and their peripherals.
No
No
Are waveforms at pins (51) and
(52) of IC801 proper?
Yes
Check IC801.
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