Zenith XBV613 Service Manual - Page 22

When the YLuminance signal doesn, t appear on the screen in PB Mode

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3. Y/C CIRCUIT (2) When the Y(Luminance) signal doesn't appear on the screen in PB Mode, Is 5V applied to IC301 NO Pins23, 44, 45, 52, 68, 77? YES Is the Y/C Bus siganl NO applied to IC301 Pins53, 54, 55? YES Does the normal RF signal NO appear at IC301 Pin14? YES Check the line of the SW 5V Line. Refer to 'SYSTEM Y/C BUS CHECK Trouble Shooting'. Is the V.H.S/W signal NO applied to IC301 Pin57? YES Does the Rectangular NO waveform(5V) appear at IC301 Pin57(V.H.S/W) YES Check the System Circuit. (IC501 Pin18) Check the V.H.S/W level. Clean the Drum. Does the Y(Luminance) signal appear at IC301 NO Pin20? YES Is the Y(Luminance) Video NO waveform shown at IC301 Pin22? YES Replace IC301. Check R328, C322, C323. Check C324. 3-11

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3-11
3. Y/C CIRCUIT
(2) When the Y(Luminance) signal doesn
’
t appear on the screen in PB Mode,
Is 5V applied to IC301
Pins23, 44, 45, 52, 68, 77?
Is the Y/C Bus siganl
applied to IC301 Pins53,
54, 55?
Does the normal RF signal
appear at IC301 Pin14?
Check the line of the SW
5V Line.
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 IC301 Pin57?
Does the Rectangular
waveform(5V) appear at
IC301 Pin57(V.H.S/W)
Clean the Drum.
Check C324.
Check R328, C322, C323.
Does the Y(Luminance)
signal appear at IC301
Pin20?
Is the Y(Luminance) Video
waveform shown at IC301
Pin22?
Replace IC301.
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO