MX-4100N, MX-4101N, MX-5000N, MX-5001N (serv.man15). Service Manual-Section 7-Self Diag and Trouble Code - Sharp Copying Equipment Service Manual (repair manual). Page 17

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MX-4101N  SELF DIAG AND TROUBLE CODE  7 – 17
 
F2-75
Cyan CRUM error
 
F2-76
Magenta CRUM error
 
F2-77
Yellow CRUM error
 
F2-78
Registration image density sensor 
trouble (Transfer belt substrate 
reflection rate abnormality)
 
F3-12
Paper feed tray 1 lift operation trouble
 
F3-22
Paper feed tray 2 lift operation trouble
 
H2-00
Thermistor open trouble
 (TH_UM_AD2)
 
H2-01
Thermistor open trouble (TH_LM)
 
H2-03
Compensation thermistor open 
trouble (TH_UM_AD1)
 
H2-04
External heating thermistor open 
(TH_EX1)
Trouble content
Detail
PCU
Cause
Toner cartridge (CRUM) trouble.
PCU PWB trouble.
Connector/harness trouble.
Check & Remedy
Replace the toner cartridge.
Replace the PCU PWB.
Connector/harness trouble.
Trouble content
Detail
PCU
Cause
Toner cartridge (CRUM) trouble.
PCU PWB trouble.
Connector/harness trouble.
Check & Remedy
Replace the toner cartridge.
Replace the PCU PWB.
Connector/harness trouble.
Trouble content
Detail
PCU
Cause
Toner cartridge (CRUM) trouble.
PCU PWB trouble.
Connector/harness trouble.
Check & Remedy
Replace the toner cartridge.
Replace the PCU PWB.
Connector/harness trouble.
Trouble content
Detail
PCU
Cause
Image density (registration) sensor trouble (Sensor 
sensitivity adjustment trouble).
PCU PWB trouble.
Connection trouble of the connector and the 
harness.
Image density (registration) sensor dirt.
Transfer belt dirt, scratch.
Check & Remedy
Replace the image density (registration) sensor.
Replace the PCU PWB.
Check connection of the connector and the harness.
Clean the image density (registration) sensor.
Clean or replace the transfer belt.
Trouble content
Detail
PCU
Cause
LUD1 is not turned ON within the specified time.
CLUD1 sensor trouble
Paper feed tray 1 lift unit trouble.
PCU PWB trouble.
Harness and connector connection trouble.
Check & Remedy
Check connection of the harness and the connector 
of LUD1.
Replace the lift-up unit.
Replace the PCU PWB.
Trouble content
LUD2 does not turn ON within the specified time.
Detail
PCU
Cause
LUD2 does not turn ON within the specified time.
CLUD2 sensor trouble.
Paper feed tray 2 lift unit trouble.
PCU PWB trouble.
Harness and connector connection trouble.
Check & Remedy
Check the harness and the connector of LUD2.
Replace the lift-up unit.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
Thermistor trouble.
PCU PWB trouble
Connection trouble of the connector and the 
harness.
Fusing unit not installed.
Check & Remedy
Replace the thermistor.
Replace the PCU PWB.
Check connection of the connector and the harness.
Trouble content
Detail
PCU
Cause
Thermistor trouble.
PCU PWB trouble.
Connection trouble of the connector and the 
harness.
Fusing unit not installed.
Check & Remedy
Replace the thermistor.
Replace the PCU PWB.
Check connection of the connector and the harness.
Trouble content
Detail
PCU
Cause
Thermistor trouble.
PCU PWB trouble
Connection trouble of the connector and the 
harness.
Fusing unit not installed.
Check & Remedy
Replace the thermistor.
Replace the PCU PWB.
Check connection of the connector and the harness.
Trouble content
Detail
PCU
Cause
Thermistor trouble.
PCU PWB trouble.
Fusing section connector connection trouble.
Power unit trouble.
Check & Remedy
Check the connector and the harness between the 
thermistor and the PCU PWB.
Replace the thermistor.
Replace the power unit.

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