Zenith XBV243 Service Manual page 21

DVD TROUBLESHOOTING (CONTINUED)
(2) When the Y(Luminance) signal doesn't appear on the screen in PB Mode
Is 5V applied to IC301
Pins 12, 36, 61, 67, 90, 96?
YES
Is the I2C Bus signal applied
to IC301 Pins 62, 63?
YES
Does the normal RF signal
appear at the IC301 Pin79?
YES
Does the Y(Luminance)
signal appear at IC301
Pin18?
YES
Is the Y(Luminance) Video
waveform showed up at
IC301 Pin39?
YES
Replace IC301.
VR168 - 923-03485
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ELECTRICAL
NO
Check the line of the REG
5V Line. (Power Circuit)
NO
Refer to 'SYSTEM I2C BUS
CHECK Trouble Shooting'.
NO
Is the V.H.S/W signal
applied to IC301 Pin81?
Does the Rectangular
waveform (5V) appear at
IC301 Pin81(V.H.S/W)
Clean the Drum.
N O
Check the path of the
Y(Luminance) signal.
N O
Check the path of the
Y(Luminance) signal.
3-9
NO
YES
NO
YES
NO
YES
YES
Check the System Circuit.
(IC501 Pin24)
Check the V.H.S/W level.
Replace IC301.
D35E COMBO - ELECTRICAL