Sharp PG-C30XU Service Manual page 45

TROUBLE SHOOTING TABLE FOR PC I/F UNIT-4
Checking the S-
XGA's green video
circuit and its
peripheral circuits
Is there signal at pin (124) of IC8606?
Yes
Are there signals at pins (68) thru
(75), (78), (81) thru (85), (87) and (88)
of IC8606?
Yes
Are there signals at TL8045 and
TL8047?
Yes
Is there signal at TL613?
Yes
Are there signals at pins (10) thru (20)
of IC8051?
Yes
CON4 (P8405), IC8051 or its
peripheral parts faulty.
No
output PWB faulty.
No
IC8606 or its peripheral circuit faulty.
No
IC8025 or its peripheral circuit faulty.
IC8020 or its peripheral circuit faulty.
No
IC8029 or its peripheral circuit faulty.
No
IC8609 or its perpheral parts faulty.
output PWB faulty.
45
Checking the VGA's
green video circuit
and its peripheral
circuits
No
Is there signal at pin (124) of IC8606?
Yes
Are there signals at pins (68) thru
No
(75), (78), (81) thru (85), (87) and (88)
of IC8606?
Yes
No
Are there signals at pins (165) thru
(177) of IC8020?
Yes
No
Are there signals at pins (178) thru
(187) of IC8020?
Yes
Check the video
system's green
video circuit and its
peripheral circuits
No
Is there signal at pin (23) of CON2
(P8404) connector?
Yes
C
PG-C30XU
C