Sharp MX-3500N Service Manual page 268
Digital full color multifunctional system
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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
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