Service manual

3-13
3. Y/C CIRCUIT
(4)
Check 5V Power.
YES
YES
NO
NO
YES
NO
YES
YES
NO
NO
Check System part
NO
Check IC301 X301.
NO
Check System part.
NO
Check System part.
(V.H/SW)
NO
Check IC301.
NO
YES
NO
YES
YES
YES
YES
YES
Check EE Mode.
Color?
Does Signal appear at
IC301 Pins58, 60?
Is I
2
C BUS applied at
IC301 Pins62, 63?
Does 3.58MHz appear at
IC301 Pin73 ?
Is I
2
C BUS applied at
IC301 Pins62, 63?
Is V.H SW supplied at
IC301 Pin81 ?
Is 5V power supplieda at
IC301 Pins12, 36, 61, 67,
90, 96?
Does FM Sinal appear at
IC301 Pins87, 88(SP)/ 92,
93(EP)?
Check Drum.
REC Mode
Is EE Mode normal?
Does Luminance Signal
supplied at IC301 Pins13,
14?
Luminance?
Check Power of Pins12,
36, 61, 67, 90, 96.
Check 5V Power part.
Does Luminance Signal
appear at IC301 Pins21,
26 ?