Sharp AR-651 Service Handbook page 168

[E15] 3rd cassette misfeeding (paper not reaching the 3rd cassette feed sensor)
Open the feed cover. Is there any paper in front of the 3rd cassette feed sensor?
YES
NO
Is the 3rd cassette feed sensor working?
(Perform the input check in the test mode: 03-[ENERGY SAVER]OFF/[4]/[B])
NO
YES
Is the 3rd cassette/tandem LCF feed clutch working? (Perform the output check in the test mode: 03-226)
NO
YES
Check the 3rd cassette/tandem LCF feed roller and separation roller. Replace them if they are worn
out.
AR-651/810 TROUBLE SHOOTING
Remove the paper.
1. Check if the connector of the 3rd cassette feed sensor is disconnected.
2. Check if the connector J328 on the LGC board is disconnected.
3. Check if the connector pins are disconnected and the harnesses are open-circuited.
4. Check if the conductor patterns on the LGC board are short- or open-circuited.
5. Replace the 3rd cassette feed sensor.
6. Replace the LGC board.
1. Check if the connector of the 3rd cassette/tandem LCF feed clutch is discon-
nected.
2. Check if the connector J328 on the LGC board is disconnected.
3. Check if the connector pins are disconnected and the harnesses are open-circuited.
4. Check if the conductor patterns on the LGC board are short- or open-circuited.
5. Replace the 3rd cassette/tandem LCF feed clutch.
6. Replace the LGC board.
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