Zenith D35 Service Manual page 25

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