Sharp DT-200, Руководство по обслуживанию

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28
XV-Z90U
DT-200
Checking of SOG Circuit
Measure the (7) pin of IC5012
with an oscilloscope.
This is the failure of the SOG
synchronization separator circuit.
Is there the Y signal including sync
signal?
Measure the (7) pin of IC5010
with an oscilloscope.
Is the composite synchronized
signal regenerated at proper timing?
No
Is there output of the (25) pin
of IC3102?
No
The SOG circuit is normal.
End.
Yes
Yes Yes
Check around Q5002.
No
Input the S terminal (Y, C) signal to
INPUT 3. Select INPUT 3 with the
keys on the main body or the
remote controller.
Is the signal N358?
Does the picture appear? Is the picture disturbed? End.
Is the picture signal inputted to the
connector TC (5) (7) pins?
Yes No
No
No
No Yes
No
In the picture signal inputted to
IC3105 (43) (44) pins?
Yes
Check the input side PWB .
Check IC3505 and the
peripheral circuits of the IC.
Yes
Yes
Check of the S terminal input.
Check the Y, C signal
lines.
Check IC3105 and the
peripheral circuits of the
IC.
1
Memo
Only in case of N358, the noise reduction
function of IC3505 is used and the noise is
reduced, so it is inputted to IC3105 (5), (7).