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TROUBLESHOOTING
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[C840] Small original reverse sensor adjustment error
[C850] Tray lift motor abnormality
Is there any extraneous material between the small original reverse sensor and reflective
mirror?
YES Remove the extraneous material.
NO
Is the reflective mirror tainted?
YES Clean up the mirror.
NO
Is the conductor pattern around IC6, IC11 and CN16 on the ADF board short- or open-cir-
cuited?
YES Replace the ADF board.
NO
Replace the small original reverse sensor.
Is the lifting tray lifted when originals are set on the feeding tray?
l
l
l
l
l
l
l
l
l
l
l
l
l
NO Is the loading of the lifting tray normal?
l
NO Adjust the mechanical loading. Remove, if any,
extraneous materials.
YES
Is the power voltage for CN5-5 and CN6 on the ADF board 24V?
NO Replace the ADF board.
YES
Replace the lifting tray motor.
YES
Is the lifting tray upper limit detection sensor working properly when the lifting tray is lifted?
NO Replace the lifting tray upper limit detection sensor.
YES
Is the lifting tray lowered when originals are removed from the original tray?
l
l
l
l
l
NO
l
l
l
NO Is the loading of the lifting tray abnormal, adjust the
mechanical loading. Remove, if any, extraneous
materials.
YES YES
1) Replace the lifting tray lower limit detection sensor.
2) Replace the ADF board.
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