Service manual

3-11
3. Y/C CIRCUIT
(2)
PB Mode
Luminance Signal does not
appear on Screen.
Does RF Signal appear at
IC301 Pin79?
Check 5V Power part.
Check V.H/SW level of
System.
Is Power 5V suppliedat at
IC301 Pin90?
Is V.H/SW normal at IC301
Pin81?
Clean Head.
Check System.
Is I
2
C BUS supplied at
IC301 Pins62,63 ?
NO
NO
Check 5V Power part.
NO
NO
YES
YES
Does the Luminance signal
appear at the IC301
Pins21, 26?
Does the C.VIDEO signal
appear at the IC301
Pin752?
Check the EE Mode.
NO
NO
YES
YES
YES
YES
YES
YES
Is Power 5V IC301 supplied
at Pins12, 36, 61, 67, 90,
96?
YES
Replace IC301.
YES