Sharp MX-6500N / MX-7500N (serv.man21) Service Manual ▷ View online
MX-7500N TROUBLESHOOTING 7 – 41
L4-43
Paper exit cooling fan R trouble
L4-44
Power source cooling fan 2 trouble
L4-48
ADU transport cooling fan motor F
trouble
trouble
L4-49
ADU transport cooling fan motor R
trouble
trouble
L4-57
Toner bottle cooling fan motor trouble
L4-60
Fusing pressure roller cooling fan
motor F trouble
motor F trouble
L4-61
Fusing pressure roller cooling fan
motor R trouble
motor R trouble
L4-63
2nd transfer belt skew correction
motor trouble
motor trouble
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.
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 initial signal of 2nd transfer belt skew correction
motor is not detected within the specified time.
motor is not detected within the specified time.
Detail
PCU
Cause
2nd transfer belt skew correction motor trouble.
2nd transfer belt skew correction motor home position
sensor trouble.
2nd transfer unit is not installed.
Harness connection trouble between the PCU PWB,
the skew correction motor and the home position
sensor.
2nd transfer belt skew correction motor home position
sensor trouble.
2nd transfer unit is not installed.
Harness connection trouble between the PCU PWB,
the skew correction motor and the home position
sensor.
Check & Remedy
Replace the skew correction motor.
Replace the home position sensor.
Check the harness and the connector between the
PCU PWB, the skew correction motor and the home
position sensor.
Replace the home position sensor.
Check the harness and the connector between the
PCU PWB, the skew correction motor and the home
position sensor.
MX-7500N TROUBLESHOOTING 7 – 42
L6-10
Polygon motor trouble
L8-01
Full wave signal detection error
L8-02
Full wave signal error
L8-11
AC Cord 2 (power for fusing) full wave
not detected
not detected
L8-12
AC Cord 2 (power for fusing) full wave
signal width abnormality
signal width abnormality
L8-20
Communication error of MFPC PWB/
SCN mother board
SCN mother board
PC--
Personal counter not detected
U1-01
Battery trouble
U2-00
MFP EEPROM read/write error
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.
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.
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.
MX-7500N TROUBLESHOOTING 7 – 43
U2-05
Erroneous detection of account
management data
management data
U2-11
MFPC PWB EEPROM counter check
sum error
sum error
U2-30
MFPC PWB and PCU PWB
manufacturing No. data inconsistency
manufacturing No. data inconsistency
U2-40
SD card system storage data area
error
error
U2-41
HDD system storage data area error
U2-42
Machine adjustment data (system
storage data area) error
storage data area) error
U2-50
HDD user authentication data check
sum error
sum error
U2-60
Watermark check error
Trouble content
Detail
MFP
Cause
Breakage of the authentication DB is detected.
Check & Remedy
When breakage of the authentication DB is detected,
the MFP is rebooted and the DB tables are
reconstructed, generating "U2-05".
The message, however, is not displayed and only the
trouble history is saved.
The authentication data are cleared.
the MFP is rebooted and the DB tables are
reconstructed, generating "U2-05".
The message, however, is not displayed and only the
trouble history is saved.
The authentication data are cleared.
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
Use SIM16 to cancel the error. (The previous writing
data (about the latest 8 sheets) are written into the
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.)
data (about the latest 8 sheets) are written into the
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.)
Trouble content
Inconsistency between the manufacturing No. saved
in the PCU PWB and that in the MFPC PWB.
in the PCU PWB and that in the MFPC PWB.
Detail
MFP
Cause
When replacing the PCU PWB or the MFPC PWB,
the EEPROM which was mounted on the PWB before
replacement is not mounted on the new PWB.
MFPC PWB trouble
PCU PWB trouble
the EEPROM which was mounted on the PWB before
replacement is not mounted on the new PWB.
MFPC PWB trouble
PCU PWB trouble
Check & Remedy
Check that the EEPROM is properly set.
Check to confirm that the EEPROM which was
mounted on the PWB before replacement is mounted
on the new PWB.
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.)
Replace the PCU PWB.
Check to confirm that the EEPROM which was
mounted on the PWB before replacement is mounted
on the new PWB.
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.)
Replace the PCU PWB.
Trouble content
Detail
MFP
Cause
A file error occurs in the SD card system storage data
partition.
SD card trouble
MFPC PWB trouble
partition.
SD card trouble
MFPC PWB trouble
Check & Remedy
Turn OFF/ON the power, and the backup data in the
HDD are written into the SD card and the machine is
automatically booted.
Check the MFPC PWB, and replace if necessary.
Check the SD card, and replace if necessary.
HDD are written into the SD card and the machine is
automatically booted.
Check the MFPC PWB, and replace if necessary.
Check the SD card, and replace if necessary.
Trouble content
Detail
MFP
Cause
A file error occurs in the HDD system saved data
area, disabling backup of the saved file of the
machine adjustment values in the SD card.
HDD trouble
MFPC PWB trouble
area, disabling backup of the saved file of the
machine adjustment values in the SD card.
HDD trouble
MFPC PWB trouble
Check & Remedy
Check the HDD, and replace if necessary.
Check the MFPC PWB, and replace if necessary.
When replacing the HDD and the MFPC PWB, refer
to the chapter of "Necessary works and procedures
of HDD and MFPC PWB replacement."
Check the MFPC PWB, and replace if necessary.
When replacing the HDD and the MFPC PWB, refer
to the chapter of "Necessary works and procedures
of HDD and MFPC PWB replacement."
Trouble content
Detail
MFP
Cause
The saved file of the machine adjustment values in
the SD card and the HDD cannot be found or is
broken.
Both of the SD card set data and the HDD system
saved data area are broken.
HDD trouble
MFPC PWB trouble
SD card trouble
the SD card and the HDD cannot be found or is
broken.
Both of the SD card set data and the HDD system
saved data area are broken.
HDD trouble
MFPC PWB trouble
SD card trouble
Check & Remedy
Check the HDD, and replace if necessary.
Check the MFPC PWB, and replace if necessary.
Check the SD card, and replace if necessary.
When replacing the HDD, the MFPC PWB, and the
SD card, refer to the chapter of "Necessary works
and procedures of HDD, MFPC PWB, and SD card
replacement.
Use SIM to adjust the machine again and set the
adjustment values.
Check the MFPC PWB, and replace if necessary.
Check the SD card, and replace if necessary.
When replacing the HDD, the MFPC PWB, and the
SD card, refer to the chapter of "Necessary works
and procedures of HDD, MFPC PWB, and SD card
replacement.
Use SIM to adjust the machine again and set the
adjustment values.
Trouble content
Detail
MFP
Cause
HDD trouble
MFPC PWB trouble
Strong external noises.
MFPC PWB trouble
Strong external noises.
Check & Remedy
Check the data related to the check sum error
(address book, image send system registration data
(senders record, meta data)) and register again.
Use SIM16 to cancel the U2 trouble.
Replace the HDD.
Replace the MFPC PWB.
(Refer to the pages on the necessary works after
replacing the HDD and the MFPC PWB in the Service
Manual, and perform the works.)
(address book, image send system registration data
(senders record, meta data)) and register again.
Use SIM16 to cancel the U2 trouble.
Replace the HDD.
Replace the MFPC PWB.
(Refer to the pages on the necessary works after
replacing the HDD and the MFPC PWB in the Service
Manual, and perform the works.)
Trouble content
Detail
MFP
Cause
Watermark data trouble
HDD trouble
MFPC PWB trouble
HDD trouble
MFPC PWB trouble
Check & Remedy
Use SIM16 to cancel the U2 trouble.
Use SIM49-5 to install the watermark data.
Replace the HDD.
Replace the MFPC PWB.
(Refer to the pages on the necessary works after
replacing the HDD and the MFPC PWB in the Service
Manual, and perform the works.)
Use SIM49-5 to install the watermark data.
Replace the HDD.
Replace the MFPC PWB.
(Refer to the pages on the necessary works after
replacing the HDD and the MFPC PWB in the Service
Manual, and perform the works.)
MX-7500N TROUBLESHOOTING 7 – 44
U2-80
SCU PWB EEPROM read/write error
U2-81
SCU PWB EEPROM check sum error
U2-90
PCU PWB EEPROM read/write error
U2-91
PCU PWB EEPROM check sum error
U5-00
Document feed unit communication
error
error
U5-16
Document feed unit fan trouble
U5-30
Document feed unit tray lift up trouble
U5-31
Document feed unit tray lift down
trouble
trouble
Trouble content
Detail
SCU
Cause
SCU PWB EEPROM trouble
SCU PWB trouble
SCU PWB EEPROM socket connection trouble
SCU PWB trouble
SCU PWB EEPROM socket connection trouble
Check & Remedy
Replace the SCU PWB EEPROM.
Replace the SCU PWB.
Check connection of the SCU PWB EEPROM socket.
Check the SIM adjustment value of the following
items, and adjust again if they are improper.
- Scanner-related adjustments
- Touch panel-related adjustments
Use SIM16 to cancel the trouble.
Replace the SCU PWB.
Check connection of the SCU PWB EEPROM socket.
Check the SIM adjustment value of the following
items, and adjust again if they are improper.
- Scanner-related adjustments
- Touch panel-related adjustments
Use SIM16 to cancel the trouble.
Trouble content
Detail
SCU
Cause
SCU PWB EEPROM trouble.
Installation of non-initialized EEPROM.
SCU PWB trouble.
EEPROM socket contact trouble.
Installation of non-initialized EEPROM.
SCU PWB trouble.
EEPROM socket contact trouble.
Check & Remedy
Replace the SCU PWB EEPROM.
Replace the SCU PWB.
Check contact of the EEPROM socket.
Use SIM16 to cancel the trouble. (The check sum
error detection data are calculated again to reset the
proper check sum data.)
Replace the SCU PWB.
Check contact of the EEPROM socket.
Use SIM16 to cancel the trouble. (The check sum
error detection data are calculated again to reset the
proper check sum data.)
Trouble content
Detail
PCU
Cause
PCU PWB EEPROM trouble
PCU PWB trouble
EEPROM socket contact trouble
PCU PWB trouble
EEPROM socket contact trouble
Check & Remedy
Replace the PCU PWB EEPROM.
Check the SIM adjustment values of the engine, and
adjust again if they are improper.
Replace the PCU PWB.
Check contact of the EEPROM socket.
Use SIM16 to cancel the trouble.
Check the SIM adjustment values of the engine, and
adjust again if they are improper.
Replace the PCU PWB.
Check contact of the EEPROM socket.
Use SIM16 to cancel the trouble.
Trouble content
Detail
PCU
Cause
PCU PWB EEPROM trouble
PCU PWB trouble
EEPROM socket contact trouble
PCU PWB trouble
EEPROM socket contact trouble
Check & Remedy
Replace the PCU PWB EEPROM.
Replace the PCU PWB.
Check contact of the EEPROM socket.
Use SIM16 to cancel the trouble. (The check sum
error detection data are calculated again to reset the
proper check sum data.)
Replace the PCU PWB.
Check contact of the EEPROM socket.
Use SIM16 to cancel the trouble. (The check sum
error detection data are calculated again to reset the
proper check sum data.)
Trouble content
Detail
SCU
Cause
Connector, harness connection trouble.
SCU PWB trouble.
DSPF PWB trouble.
SCU PWB trouble.
DSPF PWB trouble.
Check & Remedy
Turn OFF/ON the power.
Check connection of the connector and the harness.
Replace the SCU PWB.
Replace the DSPF PWB.
Check connection of the connector and the harness.
Replace the SCU PWB.
Replace the DSPF PWB.
Trouble content
Detail
SCU
Cause
When the fan is operated, the fan operation signal is
not detected within the specified time.
Fan motor trouble.
Connector, harness connection trouble.
DSPF PWB trouble.
not detected within the specified time.
Fan motor trouble.
Connector, harness connection trouble.
DSPF PWB trouble.
Check & Remedy
Use SIM2-3 to check that the fan is rotating.
Replace the fan motor.
Check connection of the connector and the harness.
Replace the DSPF PWB.
Replace the fan motor.
Check connection of the connector and the harness.
Replace the DSPF PWB.
Trouble content
Detail
SCU
Cause
STUD does not turn ON 5 times continuously within
the specified time.
STUD/STLD sensor trouble.
Connection trouble of the connector and the harness.
DSPF PWB trouble.
the specified time.
STUD/STLD sensor trouble.
Connection trouble of the connector and the harness.
DSPF PWB trouble.
Check & Remedy
Replace the STUD/STLD sensor.
Check connection of the connector and the harness.
Replace the DSPF PWB.
Check connection of the connector and the harness.
Replace the DSPF PWB.
Trouble content
Detail
SCU
Cause
STLD does not turn OFF within the specified time.
STUD/STLD sensor trouble.
Connection trouble of the connector and the harness.
DSPF PWB trouble.
STUD/STLD sensor trouble.
Connection trouble of the connector and the harness.
DSPF PWB trouble.
Check & Remedy
Replace the STUD/STLD sensor.
Check connection of the connector and the harness.
Replace the DSPF PWB.
Check connection of the connector and the harness.
Replace the DSPF PWB.
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