MX3500N SELF DIAG AND TROUBLE CODE 8 – 24
L4-06 Transfer belt separation position
sensor trouble
L4-11 Shift motor trouble
L4-30 Controller fan/HDD fan motor trouble
L4-31 Paper exit cooling fan/Toner hopper
fan trouble
L4-32 Power cooling fan/ozone exhaust fan
trouble
L4-34 LSU cooling fan trouble
L6-10 Polygon motor lock detection
Trouble content When separating the primary transfer belt unit,
change in the separation position sensor
characteristics is not detected within the specified
time.
Section PCU
Case 1 Cause Harness connection trouble between the PCU
PWB and the separation position sensor
Check and
remedy
Check the harness between the PCU PWB and
the separation position sensor.
Case 2 Cause The belt position sensor is not interrupted or it is
always interrupted. Belt separation clutch
operation trouble
Check and
remedy
Use SIM6-3 to check the belt separation operation.
Case 3 Cause The primary transfer belt unit is not installed.
Check and
remedy
Install the primary transfer belt.
Trouble content When the shift motor is initialized, no
characteristics change of the shifter home position
sensor is not detected within the specified time.
Section PCU
Case 1 Cause Shift motor trouble
Check and
remedy
Use SIM6-1 to check the operation of the shift
motor.
Case 2 Cause Harness connection trouble between the PCU
PWB and the shift motor, control circuit trouble
Check and
remedy
Use SIM30-1 to check the shifter home position
sensor. Check the harness and the connector
between the PCU PWB and the shift motor.
Case 3 Cause When the finisher is installed with the finisher
connector disconnected and when the finisher
communication trouble occurs.
Check and
remedy
Connect the finisher connector.
When the communication trouble occurs between
the PCU and the finisher, refer to the content of
F1-00.
Trouble content 1) The motor lock signal is detected during
rotation of the controller fan motor.
2) The motor lock signal is detected during
rotation of the HDD fan motor.
Section MFP
Case 1 Cause Fan motor trouble
Check and
remedy
Use SIM6-2 to check the operation of the fan
motor.
Case 2 Cause Harness connection trouble between the mother
PWB and the fan motor.
Check and
remedy
Check the harness and the connector between the
mother PWB and the fan motor.
Case 3 Cause Control circuit trouble
Check and
remedy
Replace the controller PWB.
Case 4 Cause Mother PWB trouble.
Check and
remedy
Replace the mother PWB.
Trouble content When the paper exit cooling fan/toner hopper fan
are operated, the fan operation signal is not
detected within the specified time.
Section PCU
Case 1 Cause Fan connector disconnection
Check and
remedy
Check the harness and the connector between the
PCU PWB and the fan.
Case 2 Cause Fan does not rotate because of other trouble.
Check and
remedy
Use SIM6-2 to check that the fan is rotation
actually.
Trouble content When the power cooling fan/ozone exhaust fan is
operated, the fan operation signal is not detected
within the specified time.
Section PCU
Case 1 Cause Power cooling fan or ozone exhaust fan connector
disconnection
Check and
remedy
Check the harness and the connector between the
PCU PWB and the fan.
Case 2 Cause Fan does not rotate because of other trouble
Check and
remedy
Use SIM6-2 to check that the fan is actually
rotating.
Trouble content When the LSU cooling fan is operated, the fan
operation signal is not detected within the
specified time.
Section PCU
Case 1 Cause Fan connector disconnection
Check and
remedy
Check the harness and the connector between the
LSU PWB and the fan.
Case 2 Cause Fan does not rotate because of other trouble.
Check and
remedy
Use SIM6-2 to check that the fan is rotation
actually. Replace the LSU fan. Replace the LSU
PWB.
Trouble content It is judged that the LSU polygon motor lock signal
is not outputted, and the lock signal is checked
after 7 sec from starting rotation of the polygon
motor and it is judged that the polygon motor does
not rotate properly.
Section LSU
Case 1 Cause Disconnection of the LSU connector or the LSU
inside harness, or breakage
Check and
remedy
Check connection of the harness and the
connector.
If the trouble cannot be removed, replace the
LSUcnt PWB or the LSU.
Case 2 Cause Polygon motor trouble, LSU PWB trouble
Check and
remedy
Use SIM61-1 to check the operation of the polygon
motor.
If the trouble cannot be removed, replace the
LSUcnt PWB or the LSU.
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