Sharp XG-C55X Service Manual page 47

TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)
Checking of GA4 and Its Periphery
Select R, G and B individually on
the pattern menu in the process
mode.
Is picture outputted appropriately
in R, G and B?
No
Measure the signals at pins (54),
(66) and (78) of SC8001 on the
oscilloscope. These signals are
MSB of B/G/R/.
Do the oscilloscope-measured
signals match with those selected
on the pattern menu?
No
Does the clock signal come to pins
(40) and (42) of SC8001?
Yes
Measure the signals at TL8106,
TL8107, TL8108, TL8110 and
TL8111 on the oscilloscope.
Do the oscilloscope-measured
signals match with those selected
on the pattern menu?
Yes
IC8029 is defective.
Yes
Checking of GA4 and its periphery
ends.
Yes
The OUTPUT PWB is defective.
No
Is there the clock (37.5 MHz)
signal at TL8114?
No
Is there the clock (37.5 MHz)
signal at FL8110?
Yes
IC8025 is defective.
No
IC8025 is defective.
47
Yes
IC8029 is defective.
No
X8005 is defective.
XG-C55X