3-15
FLOW CHART NO.10
Video E-E does not appear.
Is the Video signal inputted to Pins(48,50,52,54) of
IC301?
1) In the external input mode
2) In the U/V tuner mode
Check the line between Pin(20) of JK101 (Scart
jack) and Pin(50) of IC301, and service it if
defective.
Check the line between Pin(20) of JK1402
(Scart jack) and Pin(52) of IC301, and service it
if defective.
Check the line between the video input
terminal (front) and Pin(54) of IC301, and
service it if defective.
Check the line between Pin(24) of the U/V tuner
and Pin(48) of IC301, and service it if defective.
Ye s
Ye s
Ye s
No
Ye s
Ye s
Ye s
No
Ye s N o
No
No
No
No
Is the C-SYNC signal outputted to Pin(67) of IC301?
Is the C-SYNC signal inputted to Pin(58) of IC501?
Is the video signal outputted to Pin(4) of IC751?
Is the "L" pulse inputted into Pin(9,10,11) of IC751?
Ye s
Replace IC751.
Replace IC501.
Is approximately 5V voltage supplied to Pin(16)
of IC751, or approximately -5V voltage supplied to
Pin(7) of IC751?
No
Check the AL+5V line and the AL-30V line
(R764, R765), and service it if defective.
Check the line between Pin(67)
of IC301 and Pin(58) of IC501,
and service it if defective.
Check the line between Pin(4) of IC751
and Q104,
and service it if defective.
Check the line between Pin(61) of IC301 and
Pin(5) of IC751, and service it if defective.
When only Line signal is not outputted...
check the line between the emitter of Q104 and
Pin(19) of JK101 (Scart jack), and service it if
defective.
When only RF signal is not outputted...
check the tuner (TU701), and the line between
the emitter of Q104 and Pin(6) of the tuner,
and service it if defective.
Is the video signal inputted into Pin(5) of IC751?
Is the video signal outputted to the emitter of Q104?
Replace IC301.
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