Sharp XG-NV5XB Service Manual page 40

XG-NV5XB
TROUBLE SHOOTING TABLE FOR PC I/F UNIT-1
Checking the clock circuit and its peripheral circuits
Is X8001 (6MHz) oscillating?
Yes
Is X8002 (32.768kHz) 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
Check the sync signal circuit and its
peripheral circuits.
Are there signals at pins (46), (48)
and (50) of CON2 (P8404)?
Yes
Are there signals at pin (7) of IC8036?
Yes
Are there signals at pins (149) and
(150) of IC8020?
Yes
No
Is the input having a resolution below
S-VGA level or in the video mode?
Yes
Are there signals at pins (26), (28)
and (29) of IC8020?
Yes
Are there signals at pins (14), (16) and
(18) of CON4 (P8405) connector?
Yes
Are there signals at pins (168) thru
(172) of IC8029?
Yes
Are there signals at pins (38) and
(53) of P405?
Yes
Go to "Checking the PLL circuit and
its peripheral circuits".
No
X8001 or its peripheral part faulty.
No
X8002 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.
No
LCP circuitry faulty.
No
IC8023, IC8034, IC8036 or its
peripheral circuit faulty.
No
IC8025 or its peripheral circuit faulty.
No
IC8020 or its peripheral circuit faulty.
No
IC8029 or its peripheral circuit faulty.
No
IC8025 or its peripheral circuit faulty.
No
IC8029 or its peripheral circuit faulty.
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