Sharp PG-M20S (serv.man11) Service Manual ▷ View online
44
PG-M20S
PG-M20X
PG-M20X
Checking of Component Input
(except 480I)
Feed the component signal to
INPUT 1.
INPUT 1.
Select INPUT 1 using the set's
key or the remote controller.
key or the remote controller.
Is the color normal?
Is the signal type set at component?
Set the signal type to component.
Carry out the process adjustment.
Is the picture appear?
IC8013 or IC8025 is defective.
No
Go to "Checking of SOG Circuit".
No
No
Is the contour of picture clear?
Yes
Yes
No
Yes
The component is normal. End.
4
4
»
PC I/F Unit-8/12
45
PG-M20S
PG-M20X
PG-M20X
Checking of SOG Circuit
Check pin (2) of IC8365 by
oscilloscope.
oscilloscope.
The SOG sync separation circuit
(input PWB) is defective.
(input PWB) is defective.
Is there the Y signal including sync
signal?
signal?
Check the land of C8070 by
oscilloscope.
oscilloscope.
Is the composite sync signal
reproduced in correct timing?
reproduced in correct timing?
No
Go to "Confirmation of Input
Signal Setting".
Signal Setting".
No
The SOG circuit is normal.
End.
Yes
Yes
»
PC I/F Unit-9/12
46
PG-M20S
PG-M20X
PG-M20X
Feed the composite video signal to
INPUT 3.
INPUT 3.
Select INPUT 3 using the set's key
or the remote controller.
or the remote controller.
Is there any disturbance in the
picture?
picture?
The video input is normal. End.
Is the color normal?
Is the picture appear?
Go to "Checking of Video
Sync Signal".
Sync Signal".
No
Yes
Input PWB is defective.
Q8002 and its periphery are
defective.
defective.
IC8015 is defective.
No
Is there the specified signal
at R8114?
at R8114?
No
5
5
No
Checking of Video Input
Go to "Checking of Video
Sync Signal".
Sync Signal".
Carry out the process
adjustment.
adjustment.
Yes
No
Yes
Check the clock signal of IC8015
by FL8114.
by FL8114.
Is the clock signal normal?
Yes
IC8025 and its periphery are
defective.
defective.
Yes
Yes
Is the video signal inputted to
C8141?
C8141?
No
Go to "Checking of Video Sync
Signal".
Signal".
»
PC I/F Unit-10/12
47
PG-M20S
PG-M20X
PG-M20X
Checking of Video Sync Signal
Check pin (10) of IC8363 by
oscilloscope.
(Checking of vertical sync signal)
oscilloscope.
(Checking of vertical sync signal)
Check pin (6) of IC8363 by
oscilloscope.
(Checking of horizontal sync signal)
oscilloscope.
(Checking of horizontal sync signal)
Are the horizontal sync signal and
vertical sync signal outputted at
TL8130 and TL8131?
vertical sync signal outputted at
TL8130 and TL8131?
Is the vertical sync signal normal?
Is the horizontal sync signal
normal?
normal?
Yes
Go to "Confirmation of Input Signal
Setting".
Setting".
No
Yes
Is there the specified clock
(13.5 MHz) signal at FL8114?
(13.5 MHz) signal at FL8114?
Yes
End
Yes
No
IC8015 and its periphery are
defective.
defective.
IC8015 and its periphery are
defective.
defective.
No
No
»
PC I/F Unit-11/12
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