Sanyo dvw6100 Service Manual page 21

3. Y/C CIRCUIT
(2) When the Y(Luminance) signal doesn't appear on the screen in PB Mode,
Is 5V applied to the IC301
Pins23, 44, 45, 52, 68, 77?
YES
Is the Y/C Bus siganl
applied to the IC301
Pins53, 54, 55?
YES
Does the normal RF signal
appear at the IC301 Pin 14?
YES
Does the Y(Luminance)
signal appear at the IC301
Pin20?
YES
Is the Y(Luminance) Video
waveform showed up at the
IC301 Pin22?
YES
Replace the IC301.
NO
Check the line of the REG
5V Line. (Power Circuit)
Refer to 'SYSTEM Y/C
NO
BUS CHECK Trouble
Shooting'.
NO
Is the V.H.S/W signal
applied to the IC301 Pin57?
Does the Rectangular
waveform(5V) appear at
the IC301 Pin57(V.H.S/W)
Clean the Drum.
NO
Check the R328, C322,
C323.
NO
Check the C324.
3-12
NO
YES
NO
YES
Check the System Circuit.
(IC501 Pin18)
Check the V.H.S/W level.