Sharp XG-P10XU Service Manual page 44

XG-P10XU
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-1
Checking the clock circuit and its peripheral circuits
Is X8001 (6MHz) oscillating?
Yes
Is X8003 (1.84MHz) oscillating?
Yes
Is X8004 (22.165MHz) oscillating?
Yes
Is X8005 (16.25MHz) oscillating?
Yes
Does pin (162) of IC8001 function?
Yes
Are there signals at pins (100) and
(101) of IC8606?
No
Is there signal at TL8616?
No
Is there signal at TL8615?
No
Go to "Checking the Sync Signal
Circuit and Its Peripherals."
No
Is the sync signal of split type?
Yes
Are there signals at TP8004 and
TP8005?
Yes
No
Is the sync signal of Sync On Green
type?
Yes
Is there signal at TL8606?
Yes
Does the input have a below-XGA
resolution or is it video signal?
Yes
Are there signals at TL8034 and
TL8035?
Yes
Are there signals at TL8043, TL8041
and TL8042?
E
Yes
Are there signals at TL8057 and
TL8058?
Yes
Are there signals at pins (19), (20),
(21), (32), (36) and (40) of P8405?
Yes
Go to "Checking the PLL Circuit and
its Peripherals."
No
X8001 or its peripheral part faulty.
No
X8003 or its peripheral part faulty.
No
X8004 or its peripheral part faulty.
No
X8005 or its peripheral part faulty.
No
IC8001 or its peripheral circuit faulty.
Yes
IC8004 or its peripheral parts
defective.
Yes
IC8025 or its peripheral parts
defective.
Yes
IC8609 or its peripheral parts
defective.
No
Output PWB defective.
No
IC8606 or its peripheral parts
defective.
No
No
IC8025 or its peripheral parts
defective.
No
IC8020 or its peripheral parts
defective.
No
IC8029 or its peripheral parts
defective.
No
IC8609 or its peripheral parts
defective.
44
No
Are there signals at TPL8023,
TL8024 and TL8025?
Yes
E