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23
AVD-K150B/K150E/K150G/K150N/K150R
4. Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
Check the 24Pin of Tuner.
Does the Video signal
appear at the IC301 Pin48?
appear at the IC301 Pin48?
Is 5V applied to the IC301
Pins18, 24, 42, 55, 72, 91?
Pins18, 24, 42, 55, 72, 91?
Does the Video signal
appear at the IC301 Pin65?
appear at the IC301 Pin65?
Does the Video signal
appear at the IC501 Pin19?
appear at the IC501 Pin19?
Does the Video signal
appear at the Emitter termi-
nal of the Q307, Q308?
appear at the Emitter termi-
nal of the Q307, Q308?
Check the 5.2VT, 5.3VA
Line. (Power Circuit)
Line. (Power Circuit)
Is I
2
C BUS signal applied to
the IC301 Pins68, 69?
Check C316. (AGC)
Chck the path of the signal
between the IC301 Pin65
and IC501 Pin17.
between the IC301 Pin65
and IC501 Pin17.
Replace the IC301.
Does the 12VT, 5.3VA
appear at the Emitter termi-
nal of the Q804, Q308.
appear at the Emitter termi-
nal of the Q804, Q308.
Replace the Q804, Q308.
Check the 12VT, 5.3VA
Line. (Power Circuit)
Line. (Power Circuit)
Check the System Circuit.
(Refer to ‘SYSTEM I
(Refer to ‘SYSTEM I
2
C BUS
CHECK Trouble Shooting’)
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
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