Sharp XG-C68X (serv.man4) Service Manual ▷ View online
45
XG-C58X
XG-C68X
XG-C68X
TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)
Is there the horizontal sync signal
at TL8130?
at TL8130?
Is there the vertical sync signal at
TL8131?
TL8131?
Make confirmation of input signal
setting.
setting.
R8997, R8996, SC8002 or their
periphery is defective.
periphery is defective.
Is there the vertical sync signal at
pin (11) of IC8363?
pin (11) of IC8363?
Is there the horizontal sync signal
at pin (5) of IC8363?
at pin (5) of IC8363?
Yes
Yes
Yes
Are both the vertical and horizontal
sync signals in appropriate timing?
sync signals in appropriate timing?
Yes
Is the signal generator
(input source) appropriate?
(input source) appropriate?
No
R997, R996, SC8002 or their
periphery is defective.
periphery is defective.
Yes
No
IC8363 is defective.
The sync signals are as specified.
End of checking.
End of checking.
No
Yes
No
No
No
Checking of Sync Signal
Set the signal source
appropriately.
appropriately.
2
46
XG-C58X
XG-C68X
XG-C68X
TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)
No
Yes
Yes
Yes
Checking of R, G and B Signals
Is the signal type set to RGB?
Set the signal type to RGB.
No
No
Set the process mode.
Select R, G and B individually on
the pattern menu.
the pattern menu.
Go to "Checking of GA4 and Its
Periphery".
Periphery".
For checking the input signal, set
the signal generator to gradation
signal.
the signal generator to gradation
signal.
Measure the signals at TL8169,
TL8170 and TL8180 on the
oscilloscope. (MSB bit after A/D
conversion)
TL8170 and TL8180 on the
oscilloscope. (MSB bit after A/D
conversion)
Are there the specified signals at
TL8169, TL8170 and TL8180?
TL8169, TL8170 and TL8180?
Does the signal come to C8062,
C8070 and C8078?
C8070 and C8078?
Go to "Confirmation of Video Input".
IC8013 or its periphery is defective.
IC8025 or its periphery is defective.
47
XG-C58X
XG-C68X
XG-C68X
TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)
No
No
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No
No
Checking of GA4 and Its Periphery
Select R, G and B individually on
the pattern menu in the process
mode.
the pattern menu in the process
mode.
Is picture outputted appropriately
in R, G and B?
in R, G and B?
Checking of GA4 and its periphery
ends.
ends.
Measure the signals at pins (54),
(66) and (78) of SC8001 on the
oscilloscope. These signals are
MSB of B/G/R/.
(66) and (78) of SC8001 on the
oscilloscope. These signals are
MSB of B/G/R/.
Do the oscilloscope-measured
signals match with those selected
on the pattern menu?
signals match with those selected
on the pattern menu?
The OUTPUT PWB is defective.
Does the clock signal come to pins
(40) and (42) of SC8001?
(40) and (42) of SC8001?
Is there the clock (37.5 MHz)
signal at TL8114?
signal at TL8114?
IC8029 is defective.
Is there the clock (37.5 MHz)
signal at FL8110?
signal at FL8110?
X8005 is defective.
IC8025 is defective.
Measure the signals at TL8106,
TL8107, TL8108, TL8110 and
TL8111 on the oscilloscope.
TL8107, TL8108, TL8110 and
TL8111 on the oscilloscope.
Do the oscilloscope-measured
signals match with those selected
on the pattern menu?
signals match with those selected
on the pattern menu?
IC8025 is defective.
IC8029 is defective.
48
XG-C58X
XG-C68X
XG-C68X
TROUBLE SHOOTING TABLE for PC I/F UNIT (Continued)
Yes
No
Yes
Yes
No
No
No
4
4
Checking of Component Input
(except 480I)
(except 480I)
Feed the component signal to
INPUT1.
INPUT1.
Select INPUT1 using the set’s key
or the remote controller.
or the remote controller.
Does the picture appear?
Go to "Checking of SOG Circuit".
Are the colors normal?
Is the signal type set at
component?
component?
Set the signal type to component.
Is the contour of picture clear?
IC8013 or IC8025 is defective.
The component is normal. End.
Carry out the process adjustment.
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