Sharp DT-100, Руководство по обслуживанию

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DT-100
Check P2501 for breakage
and solder crack and
peripheral resistance for
solder crack.
Check SC9101 for
breakage and solder crack.
Is there any vertical stripe
(block noise) on the
NO
Is the screen all black?
Is approx. 7 V applied to
TL9303?
YES
YES
Is 3.27 V applied to IC2231
pin(1) and 1.8 V to TL2231?
YES
YES
Is 400 MHz on IC2241 pin
(20)?
YES
Is approx. 26 V applied to
TL9301?
YES
YES
Is approx. -26 V applied to
TL9302?
NO
NO
NO
NO
NO
NO
Check IC2231, IC2201,
and their peripheral
circuits.
The main PWB and DMD
PWB are in poor contact.
Check the contact surface
for dirt and smear.
Check the DMD connector
for breakage.
Reassemble the DMD,
optical mechanism, and
DMD PWB.
Check IC2241 and
peripheral circuits.
Check IC9301 and
peripheral circuits.
DMD system check