Read Sharp MX-1800N (serv.man16) Service Manual online
MX-1800N SELF DIAG AND TROUBLE CODE 8 – 21
L3-00
Mirror return trouble
L4-02
Paper feed motor lock trouble
L4-04
Developing motor trouble (BLACK)
L4-05
Developing motor trouble (COLOR)
L4-06
Transfer belt separation position
sensor trouble
sensor trouble
L4-11
Shift motor trouble
L4-30
Controller fan/HDD fan motor trouble
L4-31
Paper exit cooling fan trouble
L4-32
Power cooling fan/ozone exhaust fan
trouble
trouble
Trouble content
Mirror return is not completed within the specified
time.
time.
Section
Scanner
Case 1
Cause
Mirror unit trouble, mirror wire disengagement
Check and
remedy
remedy
Use SIM1-1 to check the mirror operation.
Trouble content
When the paper feed motor is rotated in warming
up or in canceling a jam and the lock signal is not
detected within 1sec.
up or in canceling a jam and the lock signal is not
detected within 1sec.
Section
PCU
Case 1
Cause
Paper feed motor trouble, harness connection
trouble between PCU PWB and paper feed motor,
control circuit trouble
trouble between PCU PWB and paper feed motor,
control circuit trouble
Check and
remedy
remedy
Use SIM6-1 to check the paper feed motor
operation. Check the harness and the connector
between the PCU PWB and the paper feed motor.
operation. Check the harness and the connector
between the PCU PWB and the paper feed motor.
Trouble content
The motor lock signal is detected during rotation of
the developing motor.
the developing motor.
Section
PCU
Case 1
Cause
Harness connection trouble between the PCU
PWB and the developing motor.
PWB and the developing motor.
Check and
remedy
remedy
Check the harness and the connector between the
PCU PWB and the developing motor.
PCU PWB and the developing motor.
Case 2
Cause
Developing motor trouble, control circuit trouble
Check and
remedy
remedy
Use SIM25-1 to check the operation of the
developing motor.
developing motor.
Trouble content
The motor lock signal is detected during rotation of
the developing motor.
the developing motor.
Section
PCU
Case 1
Cause
Harness connection trouble between the PCU
PWB and the developing motor.
PWB and the developing motor.
Check and
remedy
remedy
Check the harness and the connector between the
PCU PWB and the developing motor.
PCU PWB and the developing motor.
Case 2
Cause
Developing motor trouble, control circuit trouble
Check and
remedy
remedy
Use SIM25-1 to check the operation of the
developing motor.
developing motor.
Trouble content
When separating the primary transfer belt unit,
change in the separation position sensor
characteristics is not detected within the specified
time.
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
PWB and the separation position sensor
Check and
remedy
remedy
Check the harness between the PCU PWB and the
separation position sensor.
separation position sensor.
Case 2
Cause
The belt position sensor is not interrupted or it is
always interrupted. Belt separation clutch
operation trouble
always interrupted. Belt separation clutch
operation trouble
Check and
remedy
remedy
Use SIM6-3 to check the belt separation operation.
Case 3
Cause
The primary transfer belt unit is not installed.
Check and
remedy
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.
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
remedy
Use SIM6-1 to check the operation of the shift
motor.
motor.
Case 2
Cause
Harness connection trouble between the PCU
PWB and the shift motor, control circuit trouble
PWB and the shift motor, control circuit trouble
Check and
remedy
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.
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.
connector disconnected and when the finisher
communication trouble occurs.
Check and
remedy
remedy
Connect the finisher connector.
When the communication trouble occurs between
the PCU and the finisher, refer to the content of F1-
00.
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.
rotation of the controller fan motor.
2)
The motor lock signal is detected during
rotation of the HDD fan motor.
rotation of the HDD fan motor.
Section
MFP
Case 1
Cause
Fan motor trouble
Check and
remedy
remedy
Use SIM6-2 to check the operation of the fan
motor.
motor.
Case 2
Cause
Harness connection trouble between the mother
PWB and the fan motor.
PWB and the fan motor.
Check and
remedy
remedy
Check the harness and the connector between the
mother PWB and the fan motor.
mother PWB and the fan motor.
Case 3
Cause
Control circuit trouble
Check and
remedy
remedy
Replace the controller PWB.
Case 4
Cause
Mother PWB trouble.
Check and
remedy
remedy
Replace the mother PWB.
Trouble content
When the paper exit cooling fan is operated, the
fan operation signal is not detected within the
specified time.
fan operation signal is not detected within the
specified time.
Section
PCU
Case 1
Cause
Fan connector disconnection
Check and
remedy
remedy
Check the harness and the connector between the
PCU PWB and the fan.
PCU PWB and the fan.
Case 2
Cause
Fan does not rotate because of other trouble.
Check and
remedy
remedy
Use SIM6-2 to check that the fan is rotation
actually.
actually.
Trouble content
When the power cooling fan/ozone exhaust fan is
operated, the fan operation signal is not detected
within the specified time.
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
disconnection
Check and
remedy
remedy
Check the harness and the connector between the
PCU PWB and the fan.
PCU PWB and the fan.
Case 2
Cause
Fan does not rotate because of other trouble
Check and
remedy
remedy
Use SIM6-2 to check that the fan is actually
rotating.
rotating.
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