Sharp MX-4100N Service Manual page 301

: Oct. 24 2008
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F2-41 Toner density sensor trouble (CYAN)
Trouble content
Detail PCU
Cause Toner density sensor output abnormality (Sample
level 25 or less, or 231 or above)
Connection trouble of the connector and the
harness.
Developing unit trouble.
PCU PWB trouble
Check & Remedy Replace the toner density sensor.
Check connection of the connector and the harness.
Replace the developing unit.
Replace the PCU PWB.
F2-42 Toner density sensor trouble
(MAGENTA)
Trouble content
Detail PCU
Cause Toner density sensor output abnormality (Sample
level 25 or less, or 231 or above)
Connection trouble of the connector and the
harness.
Developing unit trouble.
PCU PWB trouble
Check & Remedy Replace the toner density sensor.
Check connection of the connector and the harness.
Replace the developing unit.
Replace the PCU PWB.
F2-43 Toner density sensor trouble
(YELLOW)
Trouble content
Detail PCU
Cause Toner density sensor output abnormality (Sample
level 25 or less, or 231 or above).
Connection trouble of the connector and the
harness.
Developing unit trouble.
PCU PWB trouble.
Check & Remedy Replace the toner density sensor.
Check connection of the connector and the harness.
Replace the developing unit.
Replace the PCU PWB.
F2-45 Color image density sensor trouble
Trouble content
Detail PCU
Cause Color image density sensor sensitivity adjustment
trouble.
Color image density sensor trouble.
Harness and connector connection trouble.
Image density sensor dirt.
Calibration plate dirt.
Calibration plate solenoid trouble.
PCU PWB trouble.
Check & Remedy Replace the color image density sensor.
Check connection of the connectors and the
harness.
Clean the image density sensor.
Replace the calibration plate.
Replace the calibration plate solenoid.
Replace the PCU PWB.
Use SIM44-2 to adjust the process control sensor
sensitivity.
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MX-5001N SELF DIAG AND TROUBLE CODE 7 – 15
F2-49 LSU thermistor trouble
Trouble content
Detail PCU
Cause The LSU detection temperature is outside of -28°C -
78°C.
LSU thermistor trouble.
Harness and connector connection trouble.
PCU PWB trouble
LSU control PWB trouble.
Check & Remedy Replace the LSU thermistor.
Check connection of the connectors and the
harness.
Replace the PCU PWB.
Replace the LSU control PWB.
Replace the LSU.
F2-50 K drum phase sensor trouble
Trouble content
Detail PCU
Cause Drum phase sensor trouble.
Harness and connector connection trouble.
Drum drive section trouble.
PCU PWB trouble
Check & Remedy Use SIM30-1 to check the operation of "DHPD_K.".
Replace the drum phase sensor.
Check connection of the connectors and the
harness.
Repair the drum drive section.
Replace the PCU PWB.
F2-51 CL drum phase sensor trouble
(41-sheet machine)
CL drum phase sensor trouble (CYAN)
(50-sheet machine)
Trouble content
Detail PCU
Cause Drum phase sensor trouble.
Harness and connector connection trouble.
Drum drive section trouble.
PCU PWB trouble.
Check & Remedy Use SIM30-1 to check the operation of "DHPD_CL".
Replace the drum phase sensor.
Check connection of the connectors and the
harness.
Repair the drum drive section.
Replace the PCU PWB.
F2-52 CL drum phase sensor trouble
(MAGENTA) (50-sheet machine)
Trouble content
Detail PCU
Cause Drum phase sensor trouble.
Harness and connector connection trouble.
Drum drive section trouble.
PCU PWB trouble.
Check & Remedy Use SIM30-1 to check the operation of "DHPD_CL".
Replace the drum phase sensor.
Check connection of the connectors and the
harness.
Repair the drum drive section.
Replace the PCU PWB.