Service manual

3-10
6. Y/C Circuit
(1)
EE Mode
Check part or jack of TU/IF.
Check Video at Pin28(Line Video
input) Pin30(DVD/Fr Video input)of
IC301 or Pin31(Video Input tuner).
Is 5V power supplied at
Pins12, 36, 61, 67, 90, 96 of
IC301?
Is Video Signal appear at
IC301 Pin52?
Is Video Signal appear at
IC501 Pin43?
Is Video Signal appear at
Q801 Emitter?
Check Power circuit.
Is I
2
C BUS applied at
IC301 Pins62, 63 ?
Replace IC301.
Check path from IC301
Pin52 to IC501 Pin43
Check Power Circuit.
Does 12V power flow at
C822 + Head ?
Replace Q701.
Check System.
YES
YES
YES
YES
Is Video Signal appear at
TU701 Pin6?
YES
Is 5V supplied at TU701
Pins13,14?
YES
Is VCR ’H ’Signalin TU701
Pin5?
YES
Replace TU701.
YES
YES
YES
NO
NO
NO
NO
NO
Check path from Q701
emitter to TU701 Pin6.
NO
Check Power Circuit.
NO
Check System.
NO
NO
NO