Sharp Notevision XG-C58X, Service Manual

Page: 47 / 172

47
XG-C58X
XG-C68X
TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)
No
No
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No
No
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?
Checking of GA4 and its periphery
ends.
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?
The OUTPUT PWB is defective.
Does the clock signal come to pins
(40) and (42) of SC8001?
Is there the clock (37.5 MHz)
signal at TL8114?
IC8029 is defective.
Is there the clock (37.5 MHz)
signal at FL8110?
X8005 is defective.
IC8025 is defective.
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?
IC8025 is defective.
IC8029 is defective.