3-12
3. Y/C CIRCUIT
(2) When the Y(Luminance) signal doesn’t appear on the screen in PB Mode,
Is 5.2VT, 5.3VA applied to the
IC301 Pins22, 47, 60, 84?
Is the I
2
C Bus siganl applied
to the IC301 Pins73, 74 ?
Does the normal RF signal
appear at the IC301 Pin76?
Check the line of the 5.2VT,
5.3VA Line. (Power Circuit)
Check the System Circuit.
(IC501 Pin105)
Check the V.H.S/W level.
(Check R335)
Replace the IC301.
Refer to ‘SYSTEM I
2
C BUS
CHECK Trouble Shooting’.
Is the V.H.S/W signal
applied to the IC301 Pin80?
Is V.H.S/W “H” about 3.4V
at the IC301 Pin80?
Clean the Drum.
Check the path of the
Y(Luminance) RF signal.
(Check C337, C340)
Does the Y(Luminance) RF
signal appear at the IC301
Pin9?
Is the Y(Luminance) Video
waveform showed up at
theIC301 Pins49, 40?
Replace the IC301.
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
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