Sharp MX-4100N Service Manual page 297

E7-80 MFP-SCU PWB communication error
Trouble content
Detail MFP
Cause SCU PWB connector connection trouble.
SCU PWB - MFP PWB connection trouble.
SCU PWB mother board connection trouble.
SCU PWB trouble.
MFP PWB trouble.
Replace the mother board.
Check & Remedy Check connection of the SCU PWB, the MFP PWB,
and the mother board.
Check the ground.
Replace the SCU PWB.
Replace the MFP PWB.
Replace the mother board.
E7-90 MFP - PCU PWB communication error
Trouble content
Detail MFP
Cause PCU PWB connector connection trouble.
PCU PWB - MFP PWB connection trouble.
PCU PWB motherboard connection trouble.
PCU PWB trouble.
MFP PWB trouble.
Replace the mother board.
Check & Remedy Check connection of the PCU PWB, the MFP PWB,
and the mother board.
Check the ground.
Replace the PCU PWB.
Replace the MFP PWB.
Replace the mother board.
EE-EC Automatic toner density adjustment
error (Sampling level 76 - 117/
139 - 178)
Trouble content The sampling level in the automatic toner density
adjustment is outside of 128 ±10.
Detail PCU
Cause Toner density sensor trouble.
Developing unit trouble.
PCU PWB trouble.
Check & Remedy Replace the toner density sensor.
Replace the developing unit.
Replace the PCU PWB.
EE-EL Automatic toner density adjustment
error (Overtoner)
Trouble content The sampling level in the automatic toner density
adjustment is 76 or less or the control voltage is 208
or above.
Detail PCU
Cause Toner density sensor trouble.
Charging voltage/ developing voltage trouble, toner
density trouble, or developing unit trouble.
PCU PWB trouble.
Check & Remedy Replace the toner density sensor.
Replace the developing unit.
Replace the PCU PWB.
MX-5001N SELF DIAG AND TROUBLE CODE 7 – 11
EE-EU Automatic toner density adjustment
error (Undertoner)
Trouble content The sampling level in the automatic toner density
adjustment is 178 or above or the control voltage is
51 or less.
Detail PCU
Cause Toner density sensor trouble.
Charging voltage/ developing voltage trouble, toner
density trouble, or developing unit trouble.
PCU PWB trouble.
Check & Remedy Replace the toner density sensor.
Replace the developing unit.
Replace the PCU PWB.
F1-00 Finisher - PCU PWB communication
error
Trouble content
Detail PCU
Cause Connection trouble of the connector and the harness
between the finisher and the PCU PWB.
Finisher control PWB trouble.
PCU PWB trouble.
Strong external noises.
Check & Remedy Check the connector and the harness between the
finisher and the PCU PWB.
Replace the finisher control PWB.
Replace the PCU PWB.
F1-03 Finisher paper exit roller lifting opera-
tion trouble
Trouble content
Detail PCU
Cause Finisher paper exit roller lift motor trouble.
Harness and connector connection trouble.
Home position sensor trouble.
Finisher control PWB trouble.
Check & Remedy Use SIM3-3 to check the operation of the paper exit
roller lift motor.
Replace the paper exit roller lift motor.
Check connection of the connector and the harness.
Replace the home position sensor.
Replace the finisher control PWB.
F1-08 Stapler shift trouble
Trouble content
Detail PCU
Cause Stapler shift motor trouble.
Finisher control PWB trouble.
Home position sensor trouble.
Check & Remedy Use SIM3-3 to check the operation of the stapler shift
motor.
Replace the stapler shift motor.
Check connection of the connector and the harness.
Replace the home position sensor.
Replace the finisher control PWB.