Service manual

44
XG-C40XU/XE
Yes
Yes
No No
Checking the S-
XGA's red video
circuit and its
peripheral circuits
Checking the VGA's
red video circuit and
its peripheral
circuits
Is there signal at pin (139) of IC8606?
Terminal PWB,C8616 defective.
Is there signal at pin (139) of IC8606?
Is there signal at pin (144) of IC8606?
Is there signal at pin (Y11)(TL8612) of
IC8609?
1
1
Yes
Yes
Yes
Yes
No
No
No
Yes
No
Check the video
system's red video
circuit and its
peripheral circuits
Yes
Yes
No No
Yes
No No
Are there signals at pins (21) thru (31)
as well as (34) thru (41), except for
GND, of P8606?
Are there signals at TL8044 and
TL8046?
Are there signals at pins (1) thru
(10) of IC8051?
IC8051 or its peripheral circuit or output
PWB faulty.
IC8025 or its peripheral circuit faulty.
IC8606 or its peripheral circuit faulty.
IC8020 or its peripheral circuit faulty.
IC8029 or its peripheral circuit faulty.
IC8609 or its peripheral circuit faulty.
C8702 or its peripheral circuit or signal
PWB faulty.
Are there signals at pins (21) thru (31)
as well as (34) thru (41), except for
GND, of P8606?
Are there signals at pins (112) thru
(119) of IC8020?
Are there signals at pins (69) thru (73)
and (189) thru (192) of IC8020?
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-5