Read Sharp XG-P25XE (serv.man12) Service Manual online
XG-P25X
49
TROUBLE SHOOTING TABLE FOR PC I/F UNIT
(Continued)
Checking the GA4 and its
peripheral parts
peripheral parts
Measure the signals at
FB8004, FB8005 and
FB8006 on the oscilloscope
screen.
FB8004, FB8005 and
FB8006 on the oscilloscope
screen.
Select R, G and B individually
from the process mode
pattern menu.
from the process mode
pattern menu.
Measure the signals at
TL8106, TL8107, TL8108,
TL8109, TL8110 and TL8111
on the oscilloscope screen.
TL8106, TL8107, TL8108,
TL8109, TL8110 and TL8111
on the oscilloscope screen.
Are the R, G and B video
output signals as specified?
output signals as specified?
GA4 checking ended.
Are the signals selected on
the pattern menu and those
being measured just the
same?
the pattern menu and those
being measured just the
same?
Output PWB defective.
Are there clock signals at
pins (31), (32) and (33) of
IC8051?
pins (31), (32) and (33) of
IC8051?
Is there the 32.5-MHz
clock signal at
TP8114?
clock signal at
TP8114?
IC8029 defective.
Is there the 32.5-MHz
clock signal at
FB8110?
clock signal at
FB8110?
IC8025 defective.
X8005 defective.
Are the signals selected on
the pattern menu and those
being measured just the
same?
the pattern menu and those
being measured just the
same?
IC8029 defective.
IC8025 defective.
YES
YES
NO
NO
NO
YES
YES
YES
NO
NO
YES
NO
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