Sharp MX-4100N Service Manual page 312

U5-16 Document feed unit fan trouble
Trouble content
Detail SCU
Cause When the fan is operated, the fan operation signal is
not detected within the specified time.
Fan motor trouble.
Connector, harness connection trouble.
DSPF PWB trouble.
Check & Remedy Use SIM2-3 to check that the fan is rotating.
Replace the fan motor.
Check connection of the connector and the harness.
Replace the DSPF PWB.
U5-30 Document feed unit tray lift up trouble
Trouble content
Detail SCU
Cause When STUD is not turned ON 5 times continuously
within the specified time.
STUD/STLD sensor trouble.
Connection trouble of the connector and the
harness.
Replace the DSPF PWB.
Check & Remedy Replace the STUD/STLD sensor.
Check connection of the connector and the harness.
Replace the DSPF PWB.
U5-31 Document feed unit tray lift down
trouble
Trouble content
Detail SCU
Cause STLD does not turn OFF within the specified time.
STUD/STLD sensor trouble.
Connection trouble of the connector and the
harness.
Replace the DSPF PWB.
Check & Remedy Replace the STUD/STLD sensor.
Check connection of the connector and the harness.
Replace the DSPF PWB.
U5-40 Document feed unit installation
trouble
Trouble content
Detail SCU
Cause When two or more document feed units are
detected.
Connection trouble of the connector and the
harness.
Document feeder trouble.
Check & Remedy Check connection of the connector and the harness.
MX-5001N SELF DIAG AND TROUBLE CODE 7 – 26
U6-00 Communication error of PCU/
Desk paper feed unit
Trouble content
Detail PCU
Cause Error when testing the communication line after
turning ON the power or canceling the simulation.
Connector, harness connection trouble.
Desk control PWB trouble.
PCU PWB trouble
Strong external noises.
Check & Remedy Turn OFF/ON the power to cancel.
Check the connector and the harness in the
communication line.
Replace the desk control PWB.
Replace the PCU PWB.
U6-01 Desk paper feed tray 1 lift trouble
Trouble content
Detail PCU
Cause DLUD1 does not turn ON within the specified time
when lift-up operation.
DLUD1 sensor trouble.
Desk control PWB trouble.
Lift unit trouble.
Connection trouble of the connector and the
harness.
PCU PWB trouble
Check & Remedy Replace the DLDU1 sensor.
Replace the desk control PWB.
Replace the lift unit.
Check connection of the connector and the harness.
Replace the PCU PWB.
U6-02 Desk paper feed tray 2 lift trouble
Trouble content
Detail PCU
Cause DLUD2 does not turn ON within the specified time
when lift-up operation.
DLUD2 sensor trouble.
Desk control PWB trouble.
Lift unit trouble.
Connection trouble of the connector and the
harness.
PCU PWB trouble
Check & Remedy Replace the DLDU2 sensor.
Replace the desk control PWB.
Replace the lift unit.
Check connection of the connector and the harness.
Replace the PCU PWB.