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TROUBLE SHOOTING TABLE
NO NORMAL SOUND
Is audio output terminal J400
normal ?
No
Check TV sound.
Change the sound system.
Is sound normal?
No
Yes
Is there audio
signal at pins
(46) and (48)
of IC400?
No
Yes
Check TU200
Check TU200
and its
and its
peripheral
peripheral parts.
circuits of no
problem, set
SX68KF7 only
the sound
Check IGR
system
unit and
inpositon.
peripheral
circuit.
Check IC400
and its
peripheral
circuit.
19-1
(Continued)
Yes
Is there audio signal at pins (3) and (22)
of IC300?
No
Yes
Check IC400
Set S-Volume at
and its
maximum.
peripheral
Do pins (12), (15)
parts.
of IC300 work?
No
Yes
Check IC300.
Check IC301 and
Is there audio
its peripheral
signal at pins (2)
No
and (5) of IC1300?
circuit.
Yes
Check IC1300 and
its peripheral
parts.
TROUBLE SHOOTING TABLE
NO SPECIFIC COLOUR
Is only RF signal's colour abnormal?
Check TU200,
Q455, IC400 and
their peripherals.
Set the colour
control.
Fix cotrol to
coloured
system.
Is SCP signal waveform at pin (30) of
IC800 proper?
Yes
PAL, SECAM,
NTSC4.43:
Are signal waveforms at TP801
Check X800, pin
and TP802 proper?
No
(12) of IC800 and
their peripheral circuit.
Yes
Check IC800 and
Check IC850.
its peripheral circuit.
(Continued)
Yes
No
C
NO COLOUR
Turn on colour control. Does
Yes
colour appear?
No
Turn on colour system forced
Yes
switch. Does colour appear?
No
Is chroma input level at pin (43)
of IC800 proper?
Yes
No
Check Q400
and its
peripheral circuit.
No
Check D1664
and its
peripheral circuit.
19-2
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