Sharp MX-3500N Service Manual page 268

F2-41 Toner empty sensor abnormality
(CYAN)
Trouble content Toner empty sensor output abnormality. Sample level
25 or less or 231 or above.
Section PCU
Case 1 Cause The connector is not installed.
Check Check the connection of the connector harness to the
and PCU PWB. Check the connection of the toner empty
remedy sensor.
Case 2 Cause Connector harness trouble
Check Check the harness disconnection.
and
remedy
Case 3 Cause Cartridge trouble
Check Check the cartridge connection.
and
remedy
F2-42 Toner empty sensor abnormality
(MAGENTA)
Trouble content Toner empty sensor output abnormality. Sample level
25 or less or 231 or above.
Section PCU
Case 1 Cause The connector is not installed.
Check Check the connection of the connector harness to the
and PCU PWB. Check the connection of the toner empty
remedy sensor.
Case 2 Cause Connector harness trouble
Check Check the harness disconnection.
and
remedy
Case 3 Cause Cartridge trouble
Check Check the cartridge connection.
and
remedy
F2-43 Toner empty sensor abnormality
(YELLOW)
Trouble content Toner empty sensor output abnormality. Sample level
25 or less or 231 or above.
Section PCU
Case 1 Cause The connector is not installed.
Check Check the connection of the connector harness to the
and PCU PWB. Check the connection of the toner empty
remedy sensor.
Case 2 Cause Connector harness trouble
Check Check the harness disconnection.
and
remedy
Case 3 Cause Cartridge trouble
Check Check the cartridge connection.
and
remedy
MX3500N SELF DIAG AND TROUBLE CODE 8 – 16
F2-44 Black exclusive image density sensor
trouble (Transfer belt surface
reflection ratio abnormality)
Trouble content The transfer belt surface is scanned by the image
density sensor before starting the process control, and
adjust the sensor gain so that the output is kept at a
certain level. However, the output is not within the
specified range though the senor gain is adjusted.
Section PCU
Case 1 Cause Image density sensor trouble, harness connection
trouble between PCU PWB and the image density
sensor, image density sensor dirt, transfer belt
cleaning trouble, calibration plate solenoid operation
trouble
Check Use SIM44-2 to execute the process control sensor
and gain adjustment. If "ERROR" is displayed, check the
remedy sensor, the harness, the calibration plate solenoid
operation for any trouble. If the adjustment is
completed, check the transfer belt surface state.
F2-45 Color exclusive image density sensor
trouble (Calibration
reflection ratio abnormality)
Trouble content The calibration plate surface is scanned by the image
density sensor before starting the process control, and
adjust the sensor gain so that the output is kept at a
certain level. However, the output is not within the
certain level though the senor gain is adjusted.
Section PCU
Case 1 Cause Image density sensor trouble, harness connection
trouble between PCU PWB and the image density
sensor, image density sensor dirt, calibration plate
dirt, calibration plate solenoid operation trouble
Check Use SIM44-2 to execute the process control gain
and adjustment. If "ERROR" is displayed, check the
remedy sensor and the harness. If the adjustment is
completed, check the calibration plate solenoid
operation.
F2-49 LSU thermistor trouble
Trouble content The detection temperature is out of the range of 5°C
to 55°C.
Section PCU
Case 1 Cause LSU thermistor harness connection trouble
Check Check the connection of the LSU thermistor harness
and and connector.
remedy If the trouble cannot be removed, replace the LSU
thermistor or the PCU PWB.
Case 2 Cause LSU thermistor trouble, PCU PWB trouble
Check Check the PCU PWB.
and If the trouble cannot be removed, replace the LSU
remedy thermistor or the PCU PWB.
plate surface