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MX-6240N MX-7040N (serv.man26)
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69
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603.72 KB
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Service Manual
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Device
Copying Equipment / Section 7 Troubleshooting - Updated November 2012
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mx-6240n-mx-7040n-sm26.pdf
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Sharp MX-6240N / MX-7040N (serv.man26) Service Manual ▷ View online

MX-7040N  TROUBLESHOOTING  7 – 45
 
U2-05
Erroneous detection of account 
management data
 
U2-11
MFPC PWB EEPROM counter check 
sum error
 
U2-30
MFPC PWB and PCU PWB 
manufacturing No. data inconsistency
 
U2-40
SD card system storage data area 
error
 
U2-41
HDD system storage data area error
 
U2-42
Machine adjustment data (system 
storage data area) error
 
U2-50
HDD user authentication data check 
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. 
Trouble content
Detail
MFP
Cause
MFPC PWB EEPROM trouble
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.)
Trouble content
Inconsistency between the manufacturing No. saved 
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
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.
Trouble content
Detail
MFP
Cause
A file error occurs in the SD card system storage data 
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.
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
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."
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
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.
Trouble content
Detail
MFP
Cause
HDD trouble
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.)
Trouble content
Detail
MFP
Cause
Watermark data 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.)
MX-7040N  TROUBLESHOOTING  7 – 46
 
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
 
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 content
Detail
SCU
Cause
SCU PWB EEPROM 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.
Trouble content
Detail
SCU
Cause
SCU PWB EEPROM 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.)
Trouble content
Detail
PCU
Cause
PCU PWB EEPROM 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.
Trouble content
Detail
PCU
Cause
PCU PWB EEPROM 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.)
Trouble content
Detail
SCU
Cause
Connector, harness connection 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.
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.
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.
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.
Check & Remedy
Replace the STUD/STLD sensor.
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.
Check & Remedy
Replace the STUD/STLD sensor.
Check connection of the connector and the harness.
Replace the DSPF PWB.
MX-7040N  TROUBLESHOOTING  7 – 47
 
U6-09
LCC lift motor trouble
 
U6-20
LCC control PWB - PCU PWB 
communication error
 
U6-21
LCC transport motor trouble
 
U6-22
LCC 24V power abnormality
 
U6-23
A3 LCC tray descending trouble 
(Reverse winding detection) (A3 LCC)
 
U6-24
A3 LCC tray lock detection trouble
 
U6-28
LCT1 paper feed position abnormality
Trouble content
No variation in the motor rotation sensor signal 
(encoder sign) is detected within the specified time 
after booting or stopping the LCC lift motor.
Detail
PCU
Cause
LCC lift motor rotation sensor trouble
LCC control PWB trouble
LCC lift mechanism trouble
LCC lift motor trouble
Check & Remedy
Use SIM4-2 and 4-3 to check the operation of the LCC 
sensor and the lift motor.
Check the LCC lift motor rotation sensor, and replace 
if necessary. 
Check the LCC control PWB, and replace if 
necessary. 
Check the LCC lift mechanism, and repair if 
necessary. 
Check the LCC lift motor, and replace if necessary. 
Use SIM15 to cancel the trouble.
Trouble content
Detail
PCU
Cause
Communication error between the LCC control PWB 
and the PCU PWB.
Connection trouble of the harness and the connector 
between the machine and the LCC and those of the 
LCC control PWB.
LCC control PWB trouble
PCU PWB trouble
Malfunction due to noises.
Check & Remedy
Check to confirm the LCC model.
Check the connection of the harness and the 
connector between the machine and the LCC and 
those of the LCC control PWB, and replace if 
necessary.
Check the LCC control PWB, and replace if 
necessary.
Check the PCU PWB, and replace if necessary.
Trouble content
Transport motor abnormality
Detail
PCU
Cause
Motor lock
Motor RPM abnormality
Overcurrent to the motor
LCC control PWB trouble / A3 2-stage LCT control 
PWB trouble
Check & Remedy
Use SIM04-03 to check the operation of the transport 
motor.
Replace the motor
Replace the LCC / A3 2-stage LCT control PWB.
Trouble content
The DV 24V power is not supplied to the LCC / A3 2-
stage LCT.
Detail
PCU
Cause
Connection trouble or disconnection of the connector 
and the harness.
LCC control PWB trouble / A3 2-stage LCT control 
PWB trouble
Power unit trouble
Check & Remedy
Check the connector and the harness of the power 
line.
Check the 24V voltage with the power unit, the LCC 
control PWB, and the A3 2-stage LCT control PWB.
Trouble content
It is detected that the wire of the LCC tray is reversely 
wound. (A3 LCC / A3 2-stage LCT)
The lower limit position (full state) is not detected 
within the specified time (A4: 10sec, A3: 8sec) from 
the start of descending the LCT1 tray.
(A3 3-stage LCT / A4 3-stage LCT)
Detail
PCU
Cause
Reverse winding detection SW ON
The wire is reversely wound.
Reverse winding detection SW trouble
Connection trouble of the connector and the harness
LCC control PWB trouble. (A3 LCC)
A3 2-stage LCT control PWB trouble (A3 2-stage LCT)
Remaining quantity sensor abnormality, LCT1 tray lift 
motor lock, connector and harness connection 
trouble, PWB trouble
(A3 3-stage LCT / A4 3-stage LCT)
Check & Remedy
Check the wire.
Replace the reverse winding SW and the LCC control 
PWB. / Replace the A3 2-stage LCT control PWB.
Check connection of the connector and the harness. 
(A3 LCC / A3 2-stage LCT)
Use SIM04-02 and SIM04-03 to check the operations 
of the remaining quantity sensor and the LCT1 lift 
motor. Check the wiring.
(A3 3-stage LCT / A4 3-stage LCT)
Trouble content
The LCC / A3 2-stage LCT tray lock mechanism 
malfunctions.
Detail
PCU
Cause
Tray lock mechanism breakdown
Connection trouble of the connector and the harness
Tray lock sensor trouble
LCC control PWB trouble / A3 2-stage LCT control 
PWB trouble
Check & Remedy
Check the tray lock mechanism.
Check connection of the connector and the harness.
Replace the tray lock sensor.
Replace the LCC control PWB. / Replace the A3 2-
stage LCT control PWB.
Trouble content
The upper limit sensor turns OFF before turning ON 
the pickup SOL. (Normally the upper limit sensor turns 
OFF after turning OFF the pickup SOL when starting 
lifting up.)
Detail
PCU
Cause
Sensor trouble.
The pickup roller remains in the lower position. 
(Mechanism trouble)
Check & Remedy
Use SIM04-02 and SIM04-03 to check the operations 
of the upper limit sensor and lift operations.
Wiring check.
MX-7040N  TROUBLESHOOTING  7 – 48
 
U6-29
LCT1 lift trouble
 
U6-33
LCT2 reverse winding detection 
trouble
 
U6-34
LCT2 lock detection trouble
 
U6-39
LCT2 lift trouble
 
U6-43
LCT3 reverse winding detection 
trouble
 
U6-44
LCT3 lock detection trouble
Trouble content
The upper limit is not detected within the specified 
time (A4 LCC: 10sec, A3 LCC: 8sec) when lifting up. 
(A3 3-stage LCT / A4 3-stage LCT)
The upper limit is not detected within the specified 
time when lifting. The limit SW ON is detected when 
lifting. The encoder signal does not vary when lifting. 
(A3 2-stage LCT)
Detail
PCU
Cause
Upper limit sensor abnormality, tray lift motor lock, 
connector and harness connection trouble, PWB 
trouble (A3 3-stage LCT / A4 3-stage LCT)
Sensor trouble, upper limit SW trouble, A3 2-stage 
LCT control PWB trouble, broken gear, lift motor 
trouble (A3 2-stage LCT)
Check & Remedy
Use SIM04-02 and SIM04-03 to check the operation 
of the upper limit sensor and the lift operation. Check 
the wiring.
Fix the trouble, and use SIM15 to cancel the trouble. 
(A3 3-stage LCT / A4 3-stage LCT)
Use SIM04-02 and SIM04-03 to check the operation 
of the upper limit sensor, the upper limit SW, the 
encoder sensor, and the lift motor.
Fix the trouble, and use SIM15 to cancel the trouble. 
(A3 2-stage LCT)
Trouble content
It is detected that the wire of the tray is reversely 
wound.
Detail
Cause
Reverse winding detection SW ON
The wire is reversely wound.
Reverse winding detection SW trouble
Connection trouble of the connector and the harness
A3 2-stage LCT control PWB trouble
Check & Remedy
Check the wire.
Replace the reverse winding SW.
Check connection of the connector and the harness.
Replace the A3 2-stage LCT control PWB.
Trouble content
It is detected that the tray lock mechanism 
malfunctions.
Detail
Cause
Tray lock mechanism breakdown
Connection trouble of the connector and the harness
Tray lock sensor trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Check the tray lock mechanism.
Check connection of the connector and the harness.
Replace the tray lock sensor.
Replace the A3 2-stage LCT control PWB.
Trouble content
The upper limit is not detected within the specified 
time (A4 LCC: 10sec, A3 LCC: 8sec) when lifting. 
(A3 3-stage LCT / A4 3-stage LCT)
The upper limit is not detected within the specified 
time when lifting. The limit SW ON is detected when 
lifting. The encoder signal does not vary when lifting. 
(A3 2-stage LCT)
Detail
PCU
Cause
Upper limit sensor abnormality, tray lift motor lock, 
connector and harness connection trouble, PWB 
trouble (A3 3-stage LCT / A4 3-stage LCT)
Sensor trouble, upper limit SW trouble, LCT control 
PWB trouble, broken gear, lift motor trouble (A3 2-
stage LCT)
Check & Remedy
Use SIM04-02 and SIM04-03 to check the operation 
of the upper limit sensor and the lift operation. Check 
the wiring.
Fix the trouble, and use SIM15 to cancel the trouble. 
(A3 3-stage LCT / A4 3-stage LCT)
Use SIM04-02 and SIM04-03 to check the operation 
of the upper limit sensor, the upper limit SW, the 
encoder sensor, and the lift motor.
Fix the trouble, and use SIM15 to cancel the trouble. 
(A3 2-stage LCT)
Trouble content
It is detected that the wire of the tray is reversely 
wound.
Detail
PCU
Cause
Reverse winding detection SW ON
The wire is reversely wound.
Reverse winding detection SW trouble
Connection trouble of the connector and the harness
A3 2-stage LCT control PWB trouble
Check & Remedy
Check the wire.
Replace the reverse winding SW.
Check connection of the connector and the harness.
Replace the A3 2-stage LCT control PWB.
Trouble content
It is detected that the tray lock mechanism 
malfunctions.
Detail
PCU
Cause
Tray lock mechanism breakdown
Connection trouble of the connector and the harness
Tray lock sensor trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Check the tray lock mechanism.
Check connection of the connector and the harness.
Replace the tray lock sensor.
Replace the A3 2-stage LCT control PWB.
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