Read Sharp LL-T2010W (serv.man20) Service Manual online
LL-T2010W
TROUBLE SHOOTING
4 – 6
(No)
Is the unit connected to the analog input
CN1?
CN1?
Connect the firmware upgrade jig to the
analog input CN1.
analog input CN1.
(Yes)
(No)
Is a jig connected to CN3?
Connect the jig to CN3.
(Yes)
(No)
Are CN3-1PIN, 2PIN, and 3PIN at the
same potential?
same potential?
Check CN3 and the jig connected to
CN3.
CN3.
(Yes)
(No)
Are CN3-1PIN, 2PIN, and 3PIN at
DC+12V?
DC+12V?
Check R173 and the 12V line from the
DCJACK PWB.
DCJACK PWB.
(Yes)
(No)
Is the output of Q18 at L (DC0V)?
Check the Q18 peripheral circuits.
(Yes)
(No)
Is WRPG_SEL at DC+5V?
Check the R179~R181 peripheral
circuits.
circuits.
(Yes)
(No)
Are IC6-1PIN and 13PIN changed
properly?
properly?
(Yes)
Check IC15-31PIN, 32PIN, 33PIN, 35PIN,
and 44PIN. (IF there is no abnormality,
IC15 is defective.)
and 44PIN. (IF there is no abnormality,
IC15 is defective.)
Check the IC6 peripheral circuits.
Firmware upgrade cannot be made.
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