15
SX68JF100
15-1
15-2
TROUBLE SHOOTING TABLE
(Continued)
Check TU201, Q200, Q201, Q203
and etc.
Does 5V appear at pin (7) of
TU201?
Check L201, IC601 and etc.
No
Yes
NO PICTURE
Circuits to be checked:
»
A/V circuit.
»
Tuner.
»
Peripheral circuit of Bus Line.
Does the snow noise appear
on the picture tube at max
contrast and brishtness
control?
C
Snow noise increase.
Does 9V appear at pin (6) of
TU201 (TUNER)?
Check IC605, TU201, L202,
and 9V-2 line.
Yes
No
Does 33V appear at pin (9) of
TU201?
Check IC1757, TU201 and
L203.
Yes
No
Yes
No
Yes
TROUBLE SHOOTING TABLE
(Continued)
Circuits to be checked:
¥ A/V circuit.
¥ Video output.
¥ Peripheral circuit of Bus Line.
Normal
No snow noise.
Check pin (19) of TU201.
Abnormal
C
Noise or signal
appear.
Is AV1, AV2 or AV3
input normal?
Check Q200, Q201, Q203
and their peripheral circuit.
Check TUNER and
its related parts.
Yes
No
Does pin (5) of IC402
or signal appear?
Check IC402, IC451 and
their peripheral circuit.
No
Yes
Does pin (15) of
IC2801 noise or
signal appear?
Check Q2402,
Q2404, Q2411,
IC2801 and their
peripheral circuit.
Is IC2801 RGB out
Normal?
Check IC2801 and
their peripheral
circuits.
Check the
peripheral circuits
of screen heater
(FBT) and the CRT.
Check IC3801,
IC3802, IC3803
and their peripheral
circuits.
Yes
Are pin (8) waveforms of
IC3801, IC3802, IC3803
normal?
Yes
No
No
Yes
No
Summary of Contents for SX68JF100
Page 18: ...19 SX68JF100 18 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H CHASSIS LAYOUT ...
Page 19: ...21 SX68JF100 20 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H BLOCK DIAGRAM 1 ...
Page 20: ...23 SX68JF100 22 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H BLOCK DIAGRAM 2 ...
Page 21: ...24 8 7 10 9 6 5 4 3 2 1 A B C D E F G H SX68JF100 WAVEFORMS ...
Page 25: ...29 SX68JF100 28 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H SCHEMATIC DIAGRAM MAIN Unit 1 ...
Page 26: ...31 SX68JF100 30 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H SCHEMATIC DIAGRAM MAIN Unit 2 ...
Page 28: ...35 SX68JF100 34 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H SCHEMATIC DIAGRAM POWER Unit ...
Page 33: ...41 SX68JF100 40 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H SCHEMATIC DIAGRAM VCJ Unit ...
Page 36: ...47 SX68JF100 46 12 11 10 9 8 7 6 5 4 3 2 1 A B C D E F G H PWB B POWER Unit Wiring Side ...
Page 38: ...49 SX68JF100 6 5 4 3 2 1 A B C D E F G H PWB E CONTROL Unit Wiring Side ...
Page 39: ...50 SX68JF100 6 5 4 3 2 1 A B C D E F G H PWB H SUB POWER Unit Wiring Side ...
Page 41: ...52 SX68JF100 6 5 4 3 2 1 A B C D E F G H Wiring Side PWB J VCJ Unit Wiring Side Chip Parts ...