Sanyo dvw6100 - Page 21

3-12
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?
Is the Y/C Bus siganl
applied to the IC301
Pins53, 54, 55?
Does the normal RF signal
appear at the IC301 Pin 14?
Check the line of the REG
5V Line. (Power Circuit)
Check the System Circuit.
(IC501 Pin18)
Check the V.H.S/W level.
Refer to ‘SYSTEM Y/C
BUS CHECK Trouble
Shooting’.
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.
Check the C324.
Check the R328, C322,
C323.
Does the Y(Luminance)
signal appear at the IC301
Pin20?
Is the Y(Luminance) Video
waveform showed up at the
IC301 Pin22?
Replace the IC301.
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO