Sharp XG-C40XE (serv.man5) Service Manual ▷ View online
42
XG-C40XU/XE
Checking the Sync Signal Circuit and its Peripheral Circuits
Are there signals at pins (13) thru
(52), except for GND, of P8405?
(52), except for GND, of P8405?
Yes
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
No
No
Yes
Yes
Is the sync signal of split type?
Are there signals at TP8004 and
TP8005?
TP8005?
Is the sync signal of Sync On Green
type?
type?
Are there signals at pin (7) of IC8611?
Are there signals at pins (149) (TL80
34) and (150) (TL8035) of IC8020?
34) and (150) (TL8035) of IC8020?
Does the input have a resolution lower
than XGA or is it video input?
than XGA or is it video input?
Are there signals at pins (26) (TL8043),
(28) (TL8041) and (29) (TL8042) of
IC8020?
(28) (TL8041) and (29) (TL8042) of
IC8020?
IC8610 or terminal PWB defective.
IC8025 or its peripheral part faulty.
IC8611 or its peripheral part faulty.
IC8020 or its peripheral part faulty.
IC8029,IC8609 or its peripheral
part faulty.
part faulty.
5
6
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-3
Checking the clock circuit and its peripheral circuits
Yes
No
Is X8001 (6MHz) oscillating?
X8001 or its peripheral part faulty.
Yes
Yes
Yes
No
No
No
Is X8003 (1.84MHz) oscillating?
Is X8004 (22.165MHz) oscillating?
Is X8005 (18.75MHz) oscillating?
X8005 or its peripheral part faulty.
X8004 or its peripheral part faulty.
X8003 or its peripheral part faulty.
Yes
No
IC8001 or its peripheral circuit faulty.
Does pin (162) of IC8001 function?
5
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-2
43
XG-C40XU/XE
Checking the PLL circuit and its peripheral circuits
Yes
No
Yes
No
Yes
Yes
No
No
No
Yes
4
6
Are there signal at pins (111) and
(112) of IC8606?
(112) of IC8606?
Are there signals at pins (7) and
(10) of IC8601?
(10) of IC8601?
Check the video circuit and its
peripheral circuits.
peripheral circuits.
Is image as specified at resolution
above XGA level?
above XGA level?
Is image as specified at resolution
below XGA level?
below XGA level?
Hook up a video system. Is the
display as specified?
display as specified?
IC8025,IC8600 or its peripheral
circuit faulty.
circuit faulty.
IC8601,IC8606 or its peripheral
circuit faulty.
circuit faulty.
Check the S-XGA video circuit and
its peripheral circuits.
its peripheral circuits.
Check the VGA video circuit and its
peripheral circuits.
peripheral circuits.
Check the video system's video
circuit and its peripheral circuits.
circuit and its peripheral circuits.
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-4
44
XG-C40XU/XE
Yes
Yes
No
No
Checking the S-
XGA's red video
circuit and its
peripheral circuits
XGA's red video
circuit and its
peripheral circuits
Checking the VGA's
red video circuit and
its peripheral
circuits
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?
IC8609?
1
1
Yes
Yes
Yes
Yes
No
No
No
Yes
No
Check the video
system's red video
circuit and its
peripheral circuits
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?
as well as (34) thru (41), except for
GND, of P8606?
Are there signals at TL8044 and
TL8046?
TL8046?
Are there signals at pins (1) thru
(10) of IC8051?
(10) of IC8051?
IC8051 or its peripheral circuit or output
PWB faulty.
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.
PWB faulty.
Are there signals at pins (21) thru (31)
as well as (34) thru (41), except for
GND, of P8606?
as well as (34) thru (41), except for
GND, of P8606?
Are there signals at pins (112) thru
(119) of IC8020?
(119) of IC8020?
Are there signals at pins (69) thru (73)
and (189) thru (192) of IC8020?
and (189) thru (192) of IC8020?
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-5
45
XG-C40XU/XE
Yes
Yes
No
No
1
1
Yes
Yes
Yes
Yes
No
No
No
Checking the S-
XGA's green video
circuit and its
peripheral circuits
XGA's green video
circuit and its
peripheral circuits
Checking the VGA's
green video circuit
and its peripheral
circuits
green video circuit
and its peripheral
circuits
Yes
No
Check the video
system's green
video circuit and its
peripheral circuits
system's green
video circuit and its
peripheral circuits
Yes
Yes
No
No
Yes
No
No
Is there signal at pin (124) of IC8606?
Are there signals at pins (68) thru (75)
as well as (78) thru (88), except for
GND, of P8606?
as well as (78) thru (88), except for
GND, of P8606?
Are there signals at TL8045 and
TL8047?
TL8047?
Is there signal at pin (V13)(TL8613) of
IC8609?
IC8609?
Are there signals at pins (11) thru
(20) of IC8051?
(20) of IC8051?
IC8051 or its peripheral circuit or output
PWB faulty.
PWB faulty.
Terminal PWB, C8620 defective.
IC8606 or its peripheral circuit faulty.
IC8025 or its peripheral circuit faulty.
IC8020 or its peripheral circuit faulty.
IC8029 or its peripheral circuit faulty.
IC8609 or its peripheral circuit faulty.
C8703 or its peripheral circuit or signal
PWB faulty.
PWB faulty.
Is there signal at pin (124) of IC8606?
Is there signal at pin (126) of IC8606?
Are there signals at pins (68) thru (75)
as well as (78) thru (88), except for
GND, of P8606?
as well as (78) thru (88), except for
GND, of P8606?
Are there signals at pins (165) thru
(177) of IC8020?
(177) of IC8020?
Are there signals at pins (178) thru (187)
of IC8020?
of IC8020?
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-6
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