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4. Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
Does the Video signal
appear at the IC301 Pin 48?
YES
Is 5V applied to the IC301
Pins 18, 24, 42, 55, 72, 91?
YES
Does the Video signal
appear at the IC301 Pin 65?
YES
Does the Video signal
appear at the IC501 Pin 19?
YES
Does the Video signal
appear at the Emitter termi-
nal of the Q307, Q308?
Check the Video Input
NO
Jack.
(Line In Jack)
NO
Check the 5.2VT, 5.4VA
Line. (Power Circuit)
NO
Is I
2
C BUS signal applied to
the IC301 Pins 68, 69?
YES
Chck the path of the signal
NO
between the IC301 Pin 5
and IC501 Pin 17.
Does the 12VT, 5.4VA
NO
appear at the Emitter termi-
nal of the Q307, Q308.
Replace the Q307, Q308.
3-12
Check the System Circuit.
NO
(Refer to 'SYSTEM I
CHECK Trouble Shooting')
NO
YES
2
C BUS
Check C316. (AGC)
YES
Replace the IC301.
Check the 12VT, 5.4VA
Line. (Power Circuit)
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