Sharp SX80J9 Service Manual page 18

COLOUR PRODUCED
Colour control circuit detective.
Colour in B/W mode. Colour saturation control does not
work.
Turn up and down Colour control.
Turn Colour control to minimum.
Does colour gain go up and
Does colour disappear?
down?
Yes No Yes
Killer circuit: White
Check IC801 balance:
and its Check RGB
peripherals. output circuit
of IC801. Can the sub-colour be readjusted
in service mode?
Yes
SET SUB-
Colour
Are signal waveforms at TP801 and TP802
proper? (Pins (10) and (11) of IC901)
Yes No
Are signal waveforms at pins (29)
and (30) of IC803 proper?
Yes No
Check IC801
Check IC803.
and PIP unit.
NTSC3.58:
Check X802,
IC801 and
their
peripherals.
D
Improper colour.
Turn on Colour system forced
switch. Does colour appear?
No Yes No
Fix control to
Check IC801.
coloured system.
Is chroma input level of IC801
proper?
Ref. Value: 100 ~ 500mVp-p.
No Yes No
Check IC801
Check Q803,
and its
IC451,IC5461 and their
peripherals.
peripherals.
Yes
Is SCP signal waveform at pin (2)
of IC801 proper?
No
Is FBP signal waveform at pin
(25) of IC801 proper?
Yes
PAL, Check D1606
SECAM, Check IC801. and its
NTSC4.43: peripherals.
Check X801,
IC801 and
their
peripherals.
No