Sharp MX-6240N / MX-7040N (serv.man26) Service Manual ▷ View online
MX-7040N TROUBLESHOOTING 7 – 29
F1-43
Saddle alignment operation trouble
(FSJM)
F1-44
Saddle staple motor R
trouble
(FSRSTM)
F1-45
Saddle staple trouble (FSFSTM)
F1-46
Saddle pushing plate motor trouble
(FSLGM)
F1-50
Main unit - Finisher combination error
F1-51
Saddle sensor connection trouble
F1-52
Finisher micro switch trouble
F1-60
Communication trouble between
peripheral devices (Inserter detection)
F1-90
Communication trouble between the
decurler and the downstream units.
Trouble content
Detail
PCU
Cause
Saddle alignment motor trouble.
Finisher control PWB trouble.
Home position sensor trouble.
Harness and connector connection trouble.
Finisher control PWB trouble.
Home position sensor trouble.
Harness and connector connection trouble.
Check & Remedy
Use SIM3-3 to check the operation of the Saddle
alignment motor (FSPAM).
Check connection from the control PWB to the motor.
Turn OFF/ON the power.
Replace the control PWB.
Replace the sensor.
alignment motor (FSPAM).
Check connection from the control PWB to the motor.
Turn OFF/ON the power.
Replace the control PWB.
Replace the sensor.
Trouble content
Detail
PCU
Cause
Saddle staple motor R trouble.
Finisher control PWB trouble.
Home position sensor trouble.
Harness and connector connection trouble.
Finisher control PWB trouble.
Home position sensor trouble.
Harness and connector connection trouble.
Check & Remedy
Use SIM3-3 to check the operation of the saddle
staple motor R.
Check connection from the control PWB to the motor.
Turn OFF/ON the power.
Replace the control PWB.
Replace the sensor.
staple motor R.
Check connection from the control PWB to the motor.
Turn OFF/ON the power.
Replace the control PWB.
Replace the sensor.
Trouble content
Abnormality of the staple unit drive motor in the saddle
section.
section.
Detail
PCU
Cause
Saddle staple motor trouble.
Finisher control PWB trouble.
Home position sensor trouble.
Harness and connector connection trouble.
Finisher control PWB trouble.
Home position sensor trouble.
Harness and connector connection trouble.
Check & Remedy
Use SIM3-3 to check the operation of the saddle
staple motor.
Check connection from the control PWB to the motor.
Turn OFF/ON the power.
Replace the control PWB.
Replace the sensor.
staple motor.
Check connection from the control PWB to the motor.
Turn OFF/ON the power.
Replace the control PWB.
Replace the sensor.
Trouble content
Detail
PCU
Cause
Saddle motor trouble.
Finisher control PWB trouble.
Home position sensor trouble.
Harness and connector connection trouble.
Finisher control PWB trouble.
Home position sensor trouble.
Harness and connector connection trouble.
Check & Remedy
Use SIM3-3 to check the operation of the saddle
motor.
Check connection from the control PWB to the motor.
Turn OFF/ON the power.
Replace the control PWB.
Replace the sensor.
motor.
Check connection from the control PWB to the motor.
Turn OFF/ON the power.
Replace the control PWB.
Replace the sensor.
Trouble content
Detail
PCU
Cause
The finisher which is not supported by the main unit
model is installed.
Finisher control PWB trouble.
model is installed.
Finisher control PWB trouble.
Check & Remedy
Install a proper finisher.
Replace the finisher control PWB.
Replace the finisher control PWB.
Trouble content
Detail
PCU
Cause
Finisher control PWB trouble.
Home position sensor trouble.
Harness and connector connection trouble.
Home position sensor trouble.
Harness and connector connection trouble.
Check & Remedy
Use SIM03-02 to check the operations of the guide
HP sensor and the push plate lead edge sensor.
Check connection from the control PWB to the sensor.
Replace the control PWB.
Replace the sensor.
HP sensor and the push plate lead edge sensor.
Check connection from the control PWB to the sensor.
Replace the control PWB.
Replace the sensor.
Trouble content
Detail
PCU
Cause
Finisher control PWB trouble.
Each micro switch trouble.
Harness and connector connection trouble.
Each micro switch trouble.
Harness and connector connection trouble.
Check & Remedy
Use SIM03-02 to check the operations of the front
door/upper door open detection and the oscillation
guide close detection.
Check connection from the control PWB to the sensor.
Replace the control PWB.
Replace the sensor.
door/upper door open detection and the oscillation
guide close detection.
Check connection from the control PWB to the sensor.
Replace the control PWB.
Replace the sensor.
Trouble content
Communication abnormality between the units
connected to the downstream of the inserter.
No response for a command from the inserter. Motor
abnormality.
connected to the downstream of the inserter.
No response for a command from the inserter. Motor
abnormality.
Detail
PCU
Cause
Noise on the communication line
Control PWB trouble.
Harness and connector connection trouble.
Control PWB trouble.
Harness and connector connection trouble.
Check & Remedy
Turn OFF/ON the power.
Check connection of the connector with the
downstream units of the inserter.
Replace the control PWB of the downstream units of
the inserter.
Check connection of the connector with the
downstream units of the inserter.
Replace the control PWB of the downstream units of
the inserter.
Trouble content
Communication trouble between the decurler and the
units connected to the downstream of the decurler.
units connected to the downstream of the decurler.
Detail
PCU
Cause
Noise on the communication line, control PWB
trouble, disconnection of connector or harness.
trouble, disconnection of connector or harness.
Check & Remedy
Turn OFF/ON the power.
Check connection of the connector between the
decurler unit and the downstream units of the decurler.
Replace the control PWB of the downstream units of
the decurler.
Check connection of the connector between the
decurler unit and the downstream units of the decurler.
Replace the control PWB of the downstream units of
the decurler.
MX-7040N TROUBLESHOOTING 7 – 30
F1-96
Decurler transport motor abnormality
(DCM100)
F1-97
Decurler unit fan 1 (Upper cooling fan)
abnormality (DCFAN100)
F1-98
Decurler unit fan 2 (Lower cooling fan)
abnormality (DCFAN103)
F1-99
Decurler unit fan 3
(Transport motor cooling fan)
abnormality (DCFAN101)
F2-22
Discharge lamp trouble (K)
F2-23
Discharge lamp trouble (C)
F2-24
Discharge lamp trouble (M)
F2-25
Discharge lamp trouble (Y)
Trouble content
The transport operation of the decurler transport
motor is abnormal.
motor is abnormal.
Detail
PCU
Cause
Motor driver IC overcurrent detection, overheat
detection.
detection.
Check & Remedy
Use SIM3-51 to check the operation of the decurler
transport motor.
Replace the control PWB.
transport motor.
Replace the control PWB.
Trouble content
The operation of the fan in the decurler unit is
abnormal.
abnormal.
Detail
PCU
Cause
Motor lock, motor harness short/open, control PWB
trouble, disconnection of harness or connector.
trouble, disconnection of harness or connector.
Check & Remedy
Use SIM3-51 to check the operation of the decurler
unit fan 1 (Upper cooling fan).
Check connection from the control PWB to the fan
motor.
Replace the control PWB. Replace the fan motor.
unit fan 1 (Upper cooling fan).
Check connection from the control PWB to the fan
motor.
Replace the control PWB. Replace the fan motor.
Trouble content
The operation of the fan in the decurler unit is
abnormal.
abnormal.
Detail
PCU
Cause
Motor lock, motor harness short/open, control PWB
trouble, disconnection of harness or connector.
trouble, disconnection of harness or connector.
Check & Remedy
Use SIM3-51 to check the operation of the decurler
unit fan 2 (Lower cooling fan).
Check connection from the control PWB to the fan
motor.
Replace the control PWB. Replace the fan motor.
unit fan 2 (Lower cooling fan).
Check connection from the control PWB to the fan
motor.
Replace the control PWB. Replace the fan motor.
Trouble content
The operation of the fan in the decurler unit is
abnormal.
abnormal.
Detail
PCU
Cause
Motor lock, motor harness short/open, control PWB
trouble, disconnection of harness or connector.
trouble, disconnection of harness or connector.
Check & Remedy
Use SIM3-51 to check the operation of the decurler
unit fan 3 (Transport motor cooling fan).
Check connection from the control PWB to the fan
motor.
Replace the control PWB. Replace the fan motor.
unit fan 3 (Transport motor cooling fan).
Check connection from the control PWB to the fan
motor.
Replace the control PWB. Replace the fan motor.
Trouble content
When the discharge lamp open sensor is kept ON for
a certain time from turning ON the discharge lamp, it is
detected as a trouble.
a certain time from turning ON the discharge lamp, it is
detected as a trouble.
Detail
PCU
Cause
Contact trouble between the discharge lamp PWB (K)
and the PCU PWB.
Discharge lamp PWB (K) trouble.
PCU PWB trouble.
and the PCU PWB.
Discharge lamp PWB (K) trouble.
PCU PWB trouble.
Check & Remedy
Use SIM5-4 to check lighting of the discharge lamp
(K) [DL_K].
Check the discharge lamp PWB (K).
Check the harness and the connector.
Replace the PCU PWB.
(K) [DL_K].
Check the discharge lamp PWB (K).
Check the harness and the connector.
Replace the PCU PWB.
Trouble content
When the discharge lamp open sensor is kept ON for
a certain time from turning ON the discharge lamp, it is
detected as a trouble.
a certain time from turning ON the discharge lamp, it is
detected as a trouble.
Detail
PCU
Cause
Contact trouble between the discharge lamp PWB (C)
and the PCU PWB.
Discharge lamp PWB (C) trouble.
PCU PWB trouble.
and the PCU PWB.
Discharge lamp PWB (C) trouble.
PCU PWB trouble.
Check & Remedy
Use SIM5-4 to check lighting of the discharge lamp
(C) [DL_C].
Check the discharge lamp PWB (C).
Check the harness and the connector.
Replace the PCU PWB.
(C) [DL_C].
Check the discharge lamp PWB (C).
Check the harness and the connector.
Replace the PCU PWB.
Trouble content
When the discharge lamp open sensor is kept ON for
a certain time from turning ON the discharge lamp, it is
detected as a trouble.
a certain time from turning ON the discharge lamp, it is
detected as a trouble.
Detail
PCU
Cause
Contact trouble between the discharge lamp PWB (M)
and the PCU PWB.
Discharge lamp PWB (M) trouble.
PCU PWB trouble.
and the PCU PWB.
Discharge lamp PWB (M) trouble.
PCU PWB trouble.
Check & Remedy
Use SIM5-4 to check lighting of the discharge lamp
(M) [DL_M].
Check the discharge lamp PWB (M).
Check the harness and the connector.
Replace the PCU PWB.
(M) [DL_M].
Check the discharge lamp PWB (M).
Check the harness and the connector.
Replace the PCU PWB.
Trouble content
When the discharge lamp open sensor is kept ON for
a certain time from turning ON the discharge lamp, it is
detected as a trouble.
a certain time from turning ON the discharge lamp, it is
detected as a trouble.
Detail
PCU
Cause
Contact trouble between the discharge lamp PWB (Y)
and the PCU PWB.
Discharge lamp PWB (Y) trouble.
PCU PWB trouble.
and the PCU PWB.
Discharge lamp PWB (Y) trouble.
PCU PWB trouble.
Check & Remedy
Use SIM5-4 to check lighting of the discharge lamp
(Y) [DL_Y].
Check the discharge lamp PWB (Y).
Check the harness and the connector.
Replace the PCU PWB.
(Y) [DL_Y].
Check the discharge lamp PWB (Y).
Check the harness and the connector.
Replace the PCU PWB.
MX-7040N TROUBLESHOOTING 7 – 31
F2-39
Process temperature sensor trouble
F2-40
Toner density sensor trouble (K)
F2-41
Toner density sensor trouble (C)
F2-42
Toner density sensor trouble (M)
F2-43
Toner density sensor trouble (Y)
F2-45
Color image density sensor trouble
F2-49
LSU thermistor trouble
F2-50
K drum phase sensor trouble
F2-51
CL drum phase sensor trouble (C)
Trouble content
Detail
PCU
Cause
Process thermistor trouble.
Process thermistor harness connection trouble.
PCU PWB trouble.
Process thermistor harness connection trouble.
PCU PWB trouble.
Check & Remedy
Replace the process thermistor.
Check connection of the process thermistor harness
and the connector.
Replace the PCU PWB.
Check connection of the process thermistor harness
and the connector.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
Toner density sensor output abnormality.
Sensor connector and harness connection trouble.
Developing unit trouble.
PCU PWB trouble.
Sensor connector and harness connection trouble.
Developing unit trouble.
PCU PWB trouble.
Check & Remedy
Replace the toner density sensor.
Check connection of the sensor connector and the
harness.
Replace the developing unit.
Replace the PCU PWB.
Check connection of the sensor connector and the
harness.
Replace the developing unit.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
Toner density sensor output abnormality.
Sensor connector and harness connection trouble.
Developing unit trouble.
PCU PWB trouble.
Sensor connector and harness connection trouble.
Developing unit trouble.
PCU PWB trouble.
Check & Remedy
Replace the toner density sensor.
Check connection of the sensor connector and the
harness.
Replace the developing unit.
Replace the PCU PWB.
Check connection of the sensor connector and the
harness.
Replace the developing unit.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
Toner density sensor output abnormality.
Sensor connector and harness connection trouble.
Developing unit trouble.
PCU PWB trouble.
Sensor connector and harness connection trouble.
Developing unit trouble.
PCU PWB trouble.
Check & Remedy
Replace the toner density sensor.
Check connection of the sensor connector and the
harness.
Replace the developing unit.
Replace the PCU PWB.
Check connection of the sensor connector and the
harness.
Replace the developing unit.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
Toner density sensor output abnormality.
Sensor connector and harness connection trouble.
Developing unit trouble.
PCU PWB trouble.
Sensor connector and harness connection trouble.
Developing unit trouble.
PCU PWB trouble.
Check & Remedy
Replace the toner density sensor.
Check connection of the sensor connector and the
harness.
Replace the developing unit.
Replace the PCU PWB.
Check connection of the sensor connector and the
harness.
Replace the developing unit.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
Color image density sensor sensitivity adjustment
trouble.
Color image density sensor trouble.
Sensor harness and connector connection trouble.
Image density sensor dirt.
Calibration plate dirt.
Transfer unit lift operation trouble
PCU PWB trouble.
trouble.
Color image density sensor trouble.
Sensor harness and connector connection trouble.
Image density sensor dirt.
Calibration plate dirt.
Transfer unit lift operation trouble
PCU PWB trouble.
Check & Remedy
Replace the color image density sensor.
Check connection of the sensor harness and the
connector.
Clean the image density sensor.
Replace the calibration plate.
Repair the transfer unit lift mechanism.
Replace the PCU PWB.
Use SIM44-13 to perform the sensitivity adjustment of
the process control sensor.
Check connection of the sensor harness and the
connector.
Clean the image density sensor.
Replace the calibration plate.
Repair the transfer unit lift mechanism.
Replace the PCU PWB.
Use SIM44-13 to perform the sensitivity adjustment of
the process control sensor.
Trouble content
Detail
PCU
Cause
The LSU temperature is outside of -28
C - 78C.
LSU thermistor trouble.
LSU thermistor harness and connector connection
trouble
PCU PWB trouble.
LSU control PWB trouble.
LSU thermistor harness and connector connection
trouble
PCU PWB trouble.
LSU control PWB trouble.
Check & Remedy
Replace the PCU PWB.
Replace the LSU control PWB.
Replace the LSU.
Replace the LSU control PWB.
Replace the LSU.
Trouble content
Detail
PCU
Cause
Drum phase sensor trouble.
Drum phase sensor harness and connector
connection trouble
Drum drive section trouble.
PCU PWB trouble.
Drum phase sensor harness and connector
connection trouble
Drum drive section trouble.
PCU PWB trouble.
Check & Remedy
Use SIM30-1 to check the operation of "DHPD_K".
Replace the drum phase sensor.
Check connection of the drum phase sensor harness
and the connector.
Repair the drum drive section.
Replace the PCU PWB.
Replace the drum phase sensor.
Check connection of the drum phase sensor harness
and the connector.
Repair the drum drive section.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
Drum phase sensor trouble.
Drum phase sensor harness and connector
connection trouble
Drum drive section trouble.
PCU PWB trouble.
Drum phase sensor harness and connector
connection trouble
Drum drive section trouble.
PCU PWB trouble.
Check & Remedy
Use SIM30-1 to check the operation of "DHPD_C",
"DHPD_M", "DHPD_Y".
Replace the drum phase sensor.
Check connection of the drum phase sensor harness
and the connector.
Repair the drum drive section.
Replace the PCU PWB.
"DHPD_M", "DHPD_Y".
Replace the drum phase sensor.
Check connection of the drum phase sensor harness
and the connector.
Repair the drum drive section.
Replace the PCU PWB.
MX-7040N TROUBLESHOOTING 7 – 32
F2-52
CL drum phase sensor trouble (M)
F2-53
CL drum phase sensor trouble (Y)
F2-58
Temperature/humidity sensor trouble
(HUD_M/TH_M)
F2-64
Toner supply operation trouble (K)
F2-65
Toner supply operation trouble (C)
F2-66
Toner supply operation trouble (M)
F2-67
Toner supply operation trouble (Y)
F2-70
Improper toner cartridge detection (K)
Trouble content
Detail
PCU
Cause
Drum phase sensor trouble.
Harness and connector connection trouble.
Drum drive section trouble.
PCU PWB trouble.
Harness and connector connection trouble.
Drum drive section trouble.
PCU PWB trouble.
Check & Remedy
Use SIM30-1 to check the operation of "DHPD_C",
"DHPD_M", "DHPD_Y".
Replace the drum phase sensor.
Check connection of the connectors and the harness.
Repair the drum drive section.
Replace the PCU PWB.
"DHPD_M", "DHPD_Y".
Replace the drum phase sensor.
Check connection of the connectors and the harness.
Repair the drum drive section.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
Drum phase sensor trouble.
Harness and connector connection trouble.
Drum drive section trouble.
PCU PWB trouble.
Harness and connector connection trouble.
Drum drive section trouble.
PCU PWB trouble.
Check & Remedy
Use SIM30-1 to check the operation of "DHPD_C",
"DHPD_M", "DHPD_Y".
Replace the drum phase sensor.
Check connection of the connectors and the harness.
Repair the drum drive section.
Replace the PCU PWB.
"DHPD_M", "DHPD_Y".
Replace the drum phase sensor.
Check connection of the connectors and the harness.
Repair the drum drive section.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
Temperature/humidity sensor trouble.
Process humidity sensor harness and connector
connection trouble
PCU PWB trouble.
Process humidity sensor harness and connector
connection trouble
PCU PWB trouble.
Check & Remedy
Replace the temperature/humidity sensor.
Check connection of the temperature/humidity sensor
harness and the connector.
Replace the PCU PWB.
Check connection of the temperature/humidity sensor
harness and the connector.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
Toner motor trouble.
Toner density sensor trouble.
Connector/harness trouble.
PCU PWB trouble.
Toner cartridge trouble.
Developing unit trouble.
Tone hopper section trouble
Toner density sensor trouble.
Connector/harness trouble.
PCU PWB trouble.
Toner cartridge trouble.
Developing unit trouble.
Tone hopper section trouble
Check & Remedy
Replace the toner motor.
Replace the toner density sensor.
Connector and harness check.
Replace the PCU PWB.
Replace the toner cartridge.
Replace the developing unit.
Check the toner hopper section.
Replace the toner density sensor.
Connector and harness check.
Replace the PCU PWB.
Replace the toner cartridge.
Replace the developing unit.
Check the toner hopper section.
Trouble content
Detail
PCU
Cause
Toner motor trouble.
Toner density sensor trouble.
Connector/harness trouble.
PCU PWB trouble.
Toner cartridge trouble.
Developing unit trouble.
Tone hopper section trouble
Toner density sensor trouble.
Connector/harness trouble.
PCU PWB trouble.
Toner cartridge trouble.
Developing unit trouble.
Tone hopper section trouble
Check & Remedy
Replace the toner motor.
Replace the toner density sensor.
Connector and harness check.
Replace the PCU PWB.
Replace the toner cartridge.
Replace the developing unit.
Check the toner hopper section.
Replace the toner density sensor.
Connector and harness check.
Replace the PCU PWB.
Replace the toner cartridge.
Replace the developing unit.
Check the toner hopper section.
Trouble content
Detail
PCU
Cause
Toner motor trouble.
Toner density sensor trouble.
Connector/harness trouble.
PCU PWB trouble.
Toner cartridge trouble.
Developing unit trouble.
Tone hopper section trouble
Toner density sensor trouble.
Connector/harness trouble.
PCU PWB trouble.
Toner cartridge trouble.
Developing unit trouble.
Tone hopper section trouble
Check & Remedy
Replace the toner motor.
Replace the toner density sensor.
Connector and harness check.
Replace the PCU PWB.
Replace the toner cartridge.
Replace the developing unit.
Check the toner hopper section.
Replace the toner density sensor.
Connector and harness check.
Replace the PCU PWB.
Replace the toner cartridge.
Replace the developing unit.
Check the toner hopper section.
Trouble content
Detail
PCU
Cause
Toner motor trouble.
Toner density sensor trouble.
Connector/harness trouble.
PCU PWB trouble.
Toner cartridge trouble.
Developing unit trouble.
Tone hopper section trouble
Toner density sensor trouble.
Connector/harness trouble.
PCU PWB trouble.
Toner cartridge trouble.
Developing unit trouble.
Tone hopper section trouble
Check & Remedy
Replace the toner motor.
Replace the toner density sensor.
Connector and harness check.
Replace the PCU PWB.
Replace the toner cartridge.
Replace the developing unit.
Check the toner hopper section.
Replace the toner density sensor.
Connector and harness check.
Replace the PCU PWB.
Replace the toner cartridge.
Replace the developing unit.
Check the toner hopper section.
Trouble content
Detail
PCU
Cause
An improper toner cartridge is inserted. (The main unit
detects a toner cartridge of a different specification.)
Toner cartridge trouble.
PCU PWB trouble.
detects a toner cartridge of a different specification.)
Toner cartridge trouble.
PCU PWB trouble.
Check & Remedy
Replace the toner cartridge.
Replace the PCU PWB.
Replace the PCU PWB.
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