Sharp Notevision XG-P10XU, Service Manual

Page: 46 / 122

46
XG-P10XU
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-3
Yes
Yes
No No
Is there signal at pin (139) of IC8606?
Is there signal at pin (139) of IC8606?
output PWB faulty.
B
B
Yes
Yes
No No
Are there signals pins (21), (22), (24)
thru (28) and (34) thru (41) of
IC8606? Are there signals pins (21), (22), (24)
thru (28) and (34) thru (41) of
IC8606?
IC8606 or its peripheral circuit faulty.
Yes
Yes
Yes
Yes
Yes
No No
Are there signals at TL8044 and
TL8604?
Is there signal at TL8612?
Are there signals at pins (112) thru
(119) of IC8020?
IC8025 or its peripheral circuit faulty.
No
Are there signals at pins (67) thru (73)
and (189) thru (192) of IC8020?
IC8020 or its peripheral circuit faulty.
Are there signals at pins (1) thru (9) of
IC8051?
CON4 (P8405), IC8051 or their
peripheral parts faulty.
No
IC8609 or its peripheral circuit faulty.
output PWB faulty.
No
IC8029 or its peripheral circuit faulty.
Checking the S-
XGA's red video
circuit and its
peripheral circuits Checking the VGA's
red video circuit and
its peripheral
circuits
Yes
No
Is there signal at pin (27) of CON2
(P8404) connector?
Check the video
system's red video
circuit and its
peripheral circuits