Read Sharp XR-20S (serv.man14) Service Manual online
31
XR-10X/S
XR-20X/S
XR-20X/S
YES
NO
Is 6 V applied to TL1702
and 13 V to TL1703?
Is approx. 6 V applied to
TL1742?
YES
Is 1.5 V applied to
TL1741?
Go to "Power supply
ballast PWB check".
NO
Check IC1742 and
peripheral circuits.
NO
Check IC1741 and
peripheral circuits.
YES
Is 3.3 V applied to
TL1762?
NO
Check IC1763 and
peripheral circuits.
Is 2.5 V applied to
TL1763?
NO
Check IC1762 and
peripheral circuits.
YES
Is 5 V applied to TL1791?
NO
Check IC1791 and
peripheral circuits.
YES
Is 3.3 V applied to
TL1792?
NO
Check IC1792 and
peripheral circuits.
YES
Is 12 V applied to
TL1761?
NO
Check IC1761 and
peripheral circuits.
YES
Main PWB check
YES
Is 3.3 V applied to pin(1)
of IC1743?
NO
Check IC1743 and
peripheral circuits.
YES
Is 3.18 V applied to pin(1)
of IC2001?
NO
Check IC2001 and
peripheral circuits.
YES
Is 3.3 V applied to pin(3)
of S2001?
NO
Check that it is set to the N
side. Or remove S2001.
YES
Is rectangular wave of 50
MHz sent to X2251 pin(3)?
NO
YES
Check IC2002, IC2262,
IC2263 and peripheral
circuits.
Check X2251 and
peripheral circuits.
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