16
SX68JF100
16-1 16-2
TROUBLE SHOOTING TABLE (Continued)
No Yes
YesNo
Are there
audio signal at
pins (62) and
(64) of IC451?
Check IC451
and its
peripheral
circuit.
Check
NICAM unit,
tuner and its
peripheral
circuit.
Set the sound
system in
position.
If problem,
check pins (12),
(13) and (14) of
TU201 and their
peripheral
circuits.
NO NORMAL SOUND
Circuits to be checked:
¥ Sound control circuit.
¥ Sound out circuit.
¥ SIF circuit.
¥ S-convertor.
Is audio output terminal J451
normal.
Yes
YesNo
No
Check TV sound.
Is there audio signal at pins (52) and
(54) of IC451?
Change the sound system.
Is sound normal?
Check IC451
and its
peripheral
circuit.
Is there audio signal
at pin (9) of IC1300
and IC1301?
No
No
No
Yes
Check NICAM
unit.
Yes
Yes
Check Q1304,
Q1305 and
peripheral circuit of
IC1300, IC1301.
Does 5V appear at
pin (10) of IC1300
and IC1301?
Check IC1300,
IC1301 and speaker
connector (SS).
Is there audio
signal at pins (14)
and (16) of SC301
(NICAM unit
socket)?
Check IC1300,
IC1301 and its
peripheral circuit.
TROUBLE SHOOTING TABLE (Continued)
NoYes
Yes
Yes
Yes
Yes
No
No
Turn on Colour control. Does
colour appear?
NO SPECIFIC COLOUR
D
Is only RF signal’s colour abnormal?
Set Colour
control.
Turn on Colour system forced
switch. Does colour appear?
Fix control to
coloured
system.
Check Q2801,
IC451, IC5461
and their
peripherals.
No
Check D1664
and its
peripherals.
Check
IC2801.
Check TU201,
IC451 and their
peripherals.
Yes
Yes
Yes
No
No
Is chroma input level of IC2801
pin (13) proper?
Is FBP signal waveforms at pin
(25) of IC2801 proper?
Are signal waveforms at pins
(10) and (11) of IC2901 proper?
Are waveforms at pins (29) and
(30) of IC2806 proper?
Is SCP signal waveform at pin (2) of
IC2801 proper?
No
NO COLOUR
Check IC2801, IC2807
and IC4901.
Check IC2806 and
its peripherals.
No
PAL, SECAM,
NTSC4.43:
Check X2401, pin
(8) of IC2801 and
their peripherals.
NTSC3.58:
Check X2402, pin
(10) of IC2801 and
their peripherals.
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