Sharp XG-P25X Service Manual page 51

TROUBLE SHOOTING TABLE FOR PC I/F UNIT
Measure the VPC (IC8338)
clock signal at TL8004.
Is the clock signal as
specified?
Go to "Checking the video
sync signal".
IC8025 or its peripheral
parts defective.
Checking the video sync
signal
Measure the signal at TL8140
on the oscilloscope screen.
(Check the vertical sync
signal.)
Is the vertical sync
signal as specified?
Measure the signal at
TL8142 on the oscilloscope
screen. (Check the
horizontal sync signal.)
Is the horizontal sync
signal as specified?
6
NO
YES
IC8338 defective.
NO
YES
NO
YES
7
53
(Continued)
Go to "Checking the input
signal settings".
Input PWB defective.
XG-P25X