Sharp AR-651 Service Handbook page 157

[E21] Paper fed from the 1st cassette not reaching the 1st casette transport sensor
[E23] Paper fed from the 2nd cassette not reaching the 1st casette transport sensor
[E31] Paper fed from the 3rd cassette not reaching the 1st casette transport sensor
[E35] Paper fed from the 4th cassette not reaching the 1st casette transport sensor
[E3D] Paper fed from the tandem LCF not reaching the 1st casette transport sensor
Open the feed cover. Is there paper in front of the 1st cassette transport sensor?
YES
Remove the paper.
NO
Is the 1st cassette transport sensor working?
(Perform the input check in the test mode: 03-[ENERGY SAVER]OFF/[2]/[B])
NO
1. Check if the connector of the 1st cassette transport sensor is disconnected.
2. Check if the connector J328, 329,350 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 pattern on the LGC board is short- or open-circuited.
5. Replace the 1st cassette transport sensor.
6. Replace the LGC board.
YES
Are the transport clutches working? (Perform the output check in the test mode:
03-202, 203, 210)
NO
1. Check if the connectors of the transport clutches are disconnected.
2. Check if the connector J328, 329, 350 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 pattern on the LGC board is short- or open-circuited.
5. Replace the transport clutches.
6. Replace the LGC board.
YES
Check the transport roller. Replace it if it is worn out.
5 - 7 AR-651/810 TROUBLE SHOOTING