Sharp MX-6240N / MX-7040N (serv.man26) Service Manual ▷ View online
MX-7040N TROUBLESHOOTING 7 – 41
L4-16
Fusing pressure release trouble
L4-17
Drum motor lock trouble (K)
L4-18
Drum motor lock trouble (C)
L4-19
Drum motor lock trouble (M)
L4-20
Drum motor lock trouble (Y)
L4-28
Sub power source cooling fan motor
L4-30
Controller fan motor
L4-31
Paper exit cooling fan F trouble
L4-32
Power source cooling fan 1 trouble
Trouble content
A change in the fusing pressure release sensor signal
cannot be detected within the specified time after
outputting the fusing pressure release motor.
cannot be detected within the specified time after
outputting the fusing pressure release motor.
Detail
PCU
Cause
Fusing pressure release sensor trouble.
Fusing pressure release motor trouble.
Pressure release drive gear and pressure release idle
gear trouble.
PCU PWB trouble.
Connection trouble of the connector and the harness.
Fusing pressure release motor trouble.
Pressure release drive gear and pressure release idle
gear trouble.
PCU PWB trouble.
Connection trouble of the connector and the harness.
Check & Remedy
Replace the fusing pressure release sensor.
Replace the fusing pressure release motor.
Replace the pressure release drive gear and the
pressure release idle gear.
Replace the PCU PWB.
Check connection of the connector and the harness.
Replace the fusing pressure release motor.
Replace the pressure release drive gear and the
pressure release idle gear.
Replace the PCU PWB.
Check connection of the connector and the harness.
Trouble content
The motor lock signal is detected during rotation of the
drum motor (K).
drum motor (K).
Detail
PCU
Cause
Drum motor trouble
Harness connection trouble between the PCU PWB
and the drum motor
Control circuit trouble
Harness connection trouble between the PCU PWB
and the drum motor
Control circuit trouble
Check & Remedy
Use SIM25-01 to check the operation of the drum
motor.
Check the harness and the connector between the
PCU PWB and the developing motor.
Replace the PCU PWB. Replace the drum motor.
motor.
Check the harness and the connector between the
PCU PWB and the developing motor.
Replace the PCU PWB. Replace the drum motor.
Trouble content
The motor lock signal is detected during rotation of the
drum motor (C).
drum motor (C).
Detail
PCU
Cause
Drum motor trouble
Harness connection trouble between the PCU PWB
and the drum motor
Control circuit trouble
Harness connection trouble between the PCU PWB
and the drum motor
Control circuit trouble
Check & Remedy
Use SIM25-01 to check the operation of the drum
motor.
Check the harness and the connector between the
PCU PWB and the developing motor.
Replace the PCU PWB. Replace the drum motor.
motor.
Check the harness and the connector between the
PCU PWB and the developing motor.
Replace the PCU PWB. Replace the drum motor.
Trouble content
The motor lock signal is detected during rotation of the
drum motor (M).
drum motor (M).
Detail
PCU
Cause
Drum motor trouble
Harness connection trouble between the PCU PWB
and the drum motor
Control circuit trouble
Harness connection trouble between the PCU PWB
and the drum motor
Control circuit trouble
Check & Remedy
Use SIM25-01 to check the operation of the drum
motor.
Check the harness and the connector between the
PCU PWB and the developing motor.
Replace the PCU PWB. Replace the drum motor.
motor.
Check the harness and the connector between the
PCU PWB and the developing motor.
Replace the PCU PWB. Replace the drum motor.
Trouble content
The motor lock signal is detected during rotation of the
drum motor (Y).
drum motor (Y).
Detail
PCU
Cause
Drum motor trouble
Harness connection trouble between the PCU PWB
and the drum motor
Control circuit trouble
Harness connection trouble between the PCU PWB
and the drum motor
Control circuit trouble
Check & Remedy
Use SIM25-01 to check the operation of the drum
motor.
Check the harness and the connector between the
PCU PWB and the developing motor.
Replace the PCU PWB. Replace the drum motor.
motor.
Check the harness and the connector between the
PCU PWB and the developing motor.
Replace the PCU PWB. Replace the drum motor.
Trouble content
The motor lock signal is detected during rotation of the
sub power cooling fan motor.
sub power cooling fan motor.
Detail
MFP
Cause
Fan motor trouble, controller PWB trouble, SCN-
Mother PWB trouble, fan motor/SCN-Mother PWB
harness connection trouble, controller PWB/SCN-
Mother PWB connection trouble, control circuit trouble
Mother PWB trouble, fan motor/SCN-Mother PWB
harness connection trouble, controller PWB/SCN-
Mother PWB connection trouble, control circuit trouble
Check & Remedy
Use SIM06-02 to check the operation of the fan motor.
Check the controller PWB, the SCN-Mother PWB, and
the harness and the connector between the fan motor
and the SCN-Mother PWB.
Check the controller PWB, the SCN-Mother PWB, and
the harness and the connector between the fan motor
and the SCN-Mother PWB.
Trouble content
The motor lock signal is detected during rotation of the
controller fan motor.
controller fan motor.
Detail
MFP
Cause
Fan motor trouble, controller PWB trouble, SCN-
Mother PWB trouble, fan motor/SCN-Mother PWB
harness connection trouble, controller PWB/SCN-
Mother PWB connection trouble, control circuit trouble
Mother PWB trouble, fan motor/SCN-Mother PWB
harness connection trouble, controller PWB/SCN-
Mother PWB connection trouble, control circuit trouble
Check & Remedy
Use SIM06-02 to check the operation of the fan motor.
Check the controller PWB, the SCN-Mother PWB, and
the harness and the connector between the fan motor
and the SCN-Mother PWB.
Check the controller PWB, the SCN-Mother PWB, and
the harness and the connector between the fan motor
and the SCN-Mother PWB.
Trouble content
The fan operation signal is not detected within the
specified time in the paper exit cooling fan F
operation.
specified time in the paper exit cooling fan F
operation.
Detail
PCU
Cause
The fan does not rotate because of disconnection of
the fan connector or other trouble.
the fan connector or other trouble.
Check & Remedy
Check the harness and the connector between the
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
Trouble content
The fan operation signal is not detected within the
specified time in the power cooling fan 1 operation.
specified time in the power cooling fan 1 operation.
Detail
PCU
Cause
The fan does not rotate because of disconnection of
the ozone exhaust fan or other trouble.
the ozone exhaust fan or other trouble.
Check & Remedy
Check the harness and the connector between the
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
MX-7040N TROUBLESHOOTING 7 – 42
L4-34
LSU cooling fan trouble
L4-35
Paper exit exhaust fan trouble
L4-36
Fusing cooling fan trouble
L4-39
Machine ventilation fan (R)
L4-40
Ozone fan motor 1 trouble
L4-41
Ozone fan motor 2 trouble
L4-42
Ozone fan motor 3 trouble
L4-43
Paper exit cooling fan R trouble
L4-44
Power source cooling fan 2 trouble
Trouble content
Detail
PCU
Cause
When the LSU cooling fan is operated, the fan
operation signal is not detected within the specified
time.
LSU fan trouble.
Harness, connector trouble.
LSU control PWB trouble.
operation signal is not detected within the specified
time.
LSU fan trouble.
Harness, connector trouble.
LSU control PWB trouble.
Check & Remedy
Use SIM6-2 to check the fan operation.
Check the LSU fan, and replace if necessary.
Check the harness/connector, and replace if
necessary.
Check the LSU control PWB, and replace if
necessary.
Check the LSU fan, and replace if necessary.
Check the harness/connector, and replace if
necessary.
Check the LSU control PWB, and replace if
necessary.
Trouble content
When the fan is operated, the fan operation signal is
not detected within the specified time.
not detected within the specified time.
Detail
PCU
Cause
The fan does not rotate because of disconnection of
the fan connector or other trouble.
the fan connector or other trouble.
Check & Remedy
Check the harness and the connector between the
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
Trouble content
When the fan is operated, the fan operation signal is
not detected within the specified time.
not detected within the specified time.
Detail
PCU
Cause
The fan does not rotate because of disconnection of
the fan connector or other trouble.
the fan connector or other trouble.
Check & Remedy
Check the harness and the connector between the
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
Trouble content
When the fan is operated, the fan operation signal is
not detected within the specified time.
not detected within the specified time.
Detail
PCU
Cause
The fan does not rotate because of disconnection of
the fan connector or other trouble.
the fan connector or other trouble.
Check & Remedy
Check the harness and the connector between the
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
Trouble content
The lock signal is detected during rotation of the
ozone fan motor 1.
ozone fan motor 1.
Detail
PCU
Cause
Harness/connector trouble between the PCU PWB
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
Check & Remedy
Use SIM6-2 to check the operation of the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
Trouble content
The lock signal is detected during rotation of the
ozone fan motor 2.
ozone fan motor 2.
Detail
PCU
Cause
Harness/connector trouble between the PCU PWB
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
Check & Remedy
Use SIM6-2 to check the operation of the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
Trouble content
When the fan is operated, the fan operation signal is
not detected within the specified time.
not detected within the specified time.
Detail
PCU
Cause
The fan does not rotate because of disconnection of
the fan connector or other trouble.
the fan connector or other trouble.
Check & Remedy
Check the harness and the connector between the
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
Trouble content
When the fan is operated, the fan operation signal is
not detected within the specified time.
not detected within the specified time.
Detail
PCU
Cause
The fan does not rotate because of disconnection of
the fan connector or other trouble.
the fan connector or other trouble.
Check & Remedy
Check the harness and the connector between the
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
PCU PWB and the fan.
Use SIM6-2 to check that the fan is actually rotating.
Trouble content
The lock signal is detected during rotation of the
power source cooling fan 2.
power source cooling fan 2.
Detail
PCU
Cause
Harness/connector trouble between the PCU PWB
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
Check & Remedy
Use SIM6-2 to check the operation of the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
MX-7040N TROUBLESHOOTING 7 – 43
L4-48
ADU transport co oling fan motor F
trouble
L4-49
ADU transport cooling fan motor R
trouble
L4-57
Toner bottle cooling fan motor trouble
L4-60
Fusing pressure roller co oling fan
motor F trouble
L4-61
Fusing pressure roller cooling
fan
motor R trouble
L6-10
Polygon motor trouble
L8-01
Full wave signal detection error
L8-02
Full wave signal error
Trouble content
The lock signal is detected during rotation of the ADU
transport cooling fan motor F.
transport cooling fan motor F.
Detail
PCU
Cause
Harness/connector trouble between the PCU PWB
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
Check & Remedy
Use SIM6-2 to check the operation of the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
Trouble content
The lock signal is detected during rotation of the ADU
transport cooling fan motor R.
transport cooling fan motor R.
Detail
PCU
Cause
Harness/connector trouble between the PCU PWB
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
Check & Remedy
Use SIM6-2 to check the operation of the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
Trouble content
The fan operation signal is not detected within the
specified time in the toner bottle cooling fan
operation.
specified time in the toner bottle cooling fan
operation.
Detail
PCU
Cause
The fan does not rotate because of disconnection of
the fan connector or other trouble.
the fan connector or other trouble.
Check & Remedy
Check the harness and the connector between the
PCU PWB and the fan motor.
Check that the fan is rotating after turning ON the
power.
PCU PWB and the fan motor.
Check that the fan is rotating after turning ON the
power.
Trouble content
When the fan is operated, the fan operation signal is
not detected within the specified time.
not detected within the specified time.
Detail
PCU
Cause
Harness connection trouble between the PCU PWB
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
Check & Remedy
Use SIM6-2 to check the operation of the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
Trouble content
When the fan is operated, the fan operation signal is
not detected within the specified time.
not detected within the specified time.
Detail
PCU
Cause
Harness connection trouble between the PCU PWB
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
and the fan motor.
PCU PWB trouble.
Fan motor trouble.
The fan does not rotate because of the other trouble.
(No power supply to the fan motor)
Check & Remedy
Use SIM6-2 to check the operation of the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
Check the harness and the connector between the
PCU PWB and the fan motor.
Replace the PCU PWB.
Replace the fan motor.
Trouble content
The polygon motor does not reach the specified RPM
within the specified time after starting rotation of the
polygon motor.
within the specified time after starting rotation of the
polygon motor.
Detail
PCU
Cause
Polygon motor trouble.
LSU control PWB trouble.
Connection trouble of the connector and the harness.
LSU control PWB trouble.
Connection trouble of the connector and the harness.
Check & Remedy
Use SIM61-1 to check the operation of the polygon
motor.
Check connection of the connector and the harness.
Replace the LSU.
Replace the LSU control PWB.
motor.
Check connection of the connector and the harness.
Replace the LSU.
Replace the LSU control PWB.
Trouble content
The full wave signal is not detected.
Detail
PCU
Cause
PCU PWB trouble.
Power unit trouble.
Connection trouble of the connector and the harness.
Power unit trouble.
Connection trouble of the connector and the harness.
Check & Remedy
Replace the PCU PWB.
Replace the power unit.
Check connection of the connector and the harness.
Replace the power unit.
Check connection of the connector and the harness.
Trouble content
Detail
PCU
Cause
An abnormality in the full wave signal frequency is
detected.
(The frequency is detected as 65Hz or above, or
45Hz or less.)
PCU PWB trouble.
Power unit trouble.
Connection trouble of the connector and the
harness.
Power frequency, waveform abnormality.
detected.
(The frequency is detected as 65Hz or above, or
45Hz or less.)
PCU PWB trouble.
Power unit trouble.
Connection trouble of the connector and the
harness.
Power frequency, waveform abnormality.
Check & Remedy
Replace the PCU PWB.
Replace the power unit.
Check connection of the connector and the harness.
Check the power waveform.
Replace the power unit.
Check connection of the connector and the harness.
Check the power waveform.
MX-7040N TROUBLESHOOTING 7 – 44
L8-11
AC Cord 2 (power for fusing) full wave
not detected
L8-12
AC Cord 2 (power for fusing) full wave
signal width abnormality
L8-20
Communication error of MFPC PWB/
SCN mother board
P1-00
PCI communication error
P1-01
PCI fan error
P1-02
Plasma generating device error
PC--
Personal counter not detected
U1-01
Battery trouble
U2-00
MFP EEPROM read/write error
Trouble content
The full wave signal is not detected.
Detail
PCU
Cause
PCU PWB trouble.
Power unit trouble.
Harness trouble.
Disconnection of the AC cord 2.
AC SUB PWB trouble.
Power unit trouble.
Harness trouble.
Disconnection of the AC cord 2.
AC SUB PWB trouble.
Check & Remedy
Replace the PCU PWB.
Replace the power unit.
Check connection of the connector and the harness.
Check the connection of the AC cord 2.
Replace the AC SUB PWB
Replace the power unit.
Check connection of the connector and the harness.
Check the connection of the AC cord 2.
Replace the AC SUB PWB
Trouble content
The frequency of the full wave signal is judged as
abnormal.
abnormal.
Detail
PCU
Cause
PCU PWB trouble.
Power unit trouble.
Harness trouble.
AC SUB PWB trouble.
Power frequency, waveform abnormality.
Power unit trouble.
Harness trouble.
AC SUB PWB trouble.
Power frequency, waveform abnormality.
Check & Remedy
Replace the PCU PWB.
Replace the power unit.
Check connection of the connector and the harness.
Replace the AC SUB PWB.
Check the power waveform.
Replace the power unit.
Check connection of the connector and the harness.
Replace the AC SUB PWB.
Check the power waveform.
Trouble content
Detail
MFP
Cause
SCN mother board PWB - MFPC PWB connection
trouble.
MFPC PWB trouble.
SCN mother board trouble.
trouble.
MFPC PWB trouble.
SCN mother board trouble.
Check & Remedy
Check connection between the SCN mother board
PWB and the MFPC PWB.
Check the ground of the main unit.
Replace the MFPC PWB.
Replace the SCN mother board.
PWB and the MFPC PWB.
Check the ground of the main unit.
Replace the MFPC PWB.
Replace the SCN mother board.
Trouble content
Detail
MFP
Cause
Communication error between the MFPC PWB and
the PCI.
Connection failure of connectors and harness
between the MFPC PWB and the PCI.
MFPC PWB trouble.
PCI control PWB trouble.
the PCI.
Connection failure of connectors and harness
between the MFPC PWB and the PCI.
MFPC PWB trouble.
PCI control PWB trouble.
Check & Remedy
Check connection of the harness and connectors
between the MFPC PWB and the PCI.
Check the MFPC PWB, and replace if necessary.
(Refer to the necessary procedures after replacement
of the MFPC PWB in the Service Manual, and
perform the procedures.)
Check the PCI control PWB, and replace if
necessary.
between the MFPC PWB and the PCI.
Check the MFPC PWB, and replace if necessary.
(Refer to the necessary procedures after replacement
of the MFPC PWB in the Service Manual, and
perform the procedures.)
Check the PCI control PWB, and replace if
necessary.
Trouble content
Detail
MFP
Cause
The PCI fan operation signal is not detected.
PCI fan trouble.
PCI control PWB trouble.
PCI fan trouble.
PCI control PWB trouble.
Check & Remedy
Check connection of the connectors and harness
between the PCI fan and the PCI control PWB.
Check the PCI control PWB, and replace if
necessary.
Check the PCI fan, and replace if necessary.
between the PCI fan and the PCI control PWB.
Check the PCI control PWB, and replace if
necessary.
Check the PCI fan, and replace if necessary.
Trouble content
Detail
MFP
Cause
Connection failure of connectors and harness
between the plasma generating device and the PCI
control PWB.
Plasma generating device trouble.
PCI control PWB trouble.
between the plasma generating device and the PCI
control PWB.
Plasma generating device trouble.
PCI control PWB trouble.
Check & Remedy
Check connection of the connectors and harness
between the plasma generating device and the PCI
control PWB.
Replace the plasma generating device.
Check the PCI control PWB, and replace if
necessary.
between the plasma generating device and the PCI
control PWB.
Replace the plasma generating device.
Check the PCI control PWB, and replace if
necessary.
Trouble content
Detail
MFP
Cause
The personal counter is not installed.
The personal counter is not detected.
SCU PWB trouble.
The personal counter is not detected.
SCU PWB trouble.
Check & Remedy
Check connection of the connectors and the harness.
Replace the SCU PWB.
Replace the SCU PWB.
Trouble content
RTC backup battery voltage fall
Detail
MFP
Case 1
Cause
1)
Battery life
2)
Battery circuit abnormality
Check
and
Remedy
and
Remedy
Check to confirm that the battery voltage is about
2.5V or above.
Replace the battery.
2.5V or above.
Replace the battery.
Trouble content
Detail
MFP
Cause
MFPC PWB EEPROM trouble
EEPROM socket contact trouble
MFPC PWB trouble
Strong external noises.
EEPROM socket contact trouble
MFPC PWB trouble
Strong external noises.
Check & Remedy
Replace the MFPC PWB EEPROM.
Replace the MFPC PWB.
(Refer to the pages on the necessary works after
replacing the MFPC PWB in the Service Manual, and
perform the works.)
Check the power environment.
Replace the MFPC PWB.
(Refer to the pages on the necessary works after
replacing the MFPC PWB in the Service Manual, and
perform the works.)
Check the power environment.
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