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Model
MX-6500N MX-7500N (serv.man21)
Pages
66
Size
561.77 KB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / Section 7 Troubleshooting
File
mx-6500n-mx-7500n-sm21.pdf
Date
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MX-7500N  TROUBLESHOOTING  7 – 17
 
E7-35
Communication trouble with the CIS-
ASIC
 
E7-36
CIS-ASIC black level detection abnor-
mality
 
E7-37
CIS-ASIC white level detection abnor-
mality
 
E7-42
Image data trouble (Scanner 
expansion PWB (ACRE) ASIC)
 
E7-46
Image data decode error (Scanner 
expansion PWB (ACRE) ASIC)
 
E7-47
Combination error between MFP and
ACRE firmware (ACRE ASIC)
 
E7-48
Scanner expansion PWB (ACRE) ASIC
memory error
 
E7-49
Water Mark data error
Trouble content
Communication trouble (clock synchronization) 
between the CPU and the CIS-ASIC in the PCU PWB
Detail
MFP
Cause
“Connector/harness trouble between the PCU PWB 
and the PED Cis PWB.
PED Cis PWB trouble, PCU PWB trouble.
PS unit drawer connector insertion trouble."
Check & Remedy
“Check the harness between the PCU PWB and the 
PED Cis PWB.
Check the PED Cis PWB, and the PCU PWB.
If the trouble is not canceled, replace the PED Cis 
PWB and the PCU PWB.”
Trouble content
The black reference plate scan level when the lamp is 
lighted is abnormal.
Detail
MFP
Cause
“The CIS unit is not installed properly.
Harness trouble between the CIS unit and the PED 
Cis PWB.
CIS unit trouble, PED Cis PWB trouble.
Dirt on the reference black plate.”
Check & Remedy
“Check the installing state of the CIS unit 
Check the harness between the CIS unit and the PED 
Cis PWB.
Clean the reference black plate.
If the trouble is not canceled, replace the CIS unit and 
the PED Cis PWB.”
Trouble content
The white reference plate scan level when the lamp is 
lighted is abnormal.
Detail
MFP
Cause
“The CIS unit is not installed properly.
Harness trouble between the CIS unit and the PED 
Cis PWB.
CIS unit trouble, PED Cis PWB trouble.
Dirt on the reference white plate.”
Check & Remedy
“The CIS unit is not installed properly.
Harness trouble between the CIS unit and the PED 
Cis PWB.
CIS unit trouble, PED Cis PWB trouble.
Dirt on the reference white plate.”
Trouble content
Detail
MFP
Cause
An image data error occurs.
An image data send error occurs.
Scanner expansion PWB (ACRE) connection trouble.
Scanner expansion PWB (ACRE) trouble.
MFPC PWB trouble.
Check & Remedy
Check connection of the scanner expansion PWB 
(ACRE).
Check the scanner expansion PWB (ACRE), and 
replace if necessary.
Check the MFPC PWB, and replace if necessary.
Trouble content
Detail
MFP
Cause
A decode error occurs while high compression PDF 
images are made. (garbled data)
Scanner expansion PWB (ACRE) connection trouble.
Scanner expansion PWB (ACRE) trouble.
MFPC PWB trouble.
Check & Remedy
Check connection of the scanner expansion PWB 
(ACRE).
Check the scanner expansion PWB (ACRE), and 
replace if necessary.
Check the MFPC PWB, and replace if necessary.
Trouble content
Unknown ACRE board recognition information is 
detected by MFP
Detail
MFP
Cause
ACRE board whose firmware is not compatible with 
MFP is connected.
Check & Remedy
“Check the kind and the version of the firmware.
Use SIM49-1 or SIM49-10 to perform the firmware 
version-up procedure”
Trouble content
-  DDR calibration error
-  DIMM insertion trouble, etc.
Detail
MFP
Cause
Scanner expansion PWB (ACRE) DIMM trouble, 
memory slot trouble.
Scanner expansion PWB (ACRE) DIMM insertion 
trouble.
Scanner expansion PWB (ACRE) connection trouble.
Scanner expansion PWB (ACRE) trouble.
MFPC PWB trouble.
Check & Remedy
Check insertion of the scanner expansion PWB 
(ACRE) DIMM memory.
Check the scanner expansion PWB (ACRE) DIMM 
memory, and replace if necessary.
Check connection of the scanner expansion PWB 
(ACRE).
Check the scanner expansion PWB (ACRE), and 
replace if necessary.
Check the MFPC PWB, and replace if necessary.
Trouble content
Detail
MFP
Cause
Watermark data trouble.
HDD trouble.
Check & Remedy
Use SIM49-5 to upload the watermark data.
Replace the HDD.
MX-7500N  TROUBLESHOOTING  7 – 18
 
E7-50
Combination error between PWB and
firmware (PCU PWB detection)
 
E7-55
PWB information sum error (engine
detection)
 
E7-60
Combination error between PWB and
firmware (MFPC PWB detection)
 
E7-61
Combination error between the MFPC
PWB and the PCU PWB 
(MFPC PWB detection)
 
E7-80
MFP - SCU PWB communication error
 
E7-90
MFP - PCU PWB communication error
 
E7-92
Copy image data error
 
E7-93
Copy, image send, filing, print image
data process error
Trouble content
Detail
PCU
Cause
A PWB/firmware/LSU which is not compatible with the 
machine specifications is detected.
PCU PWB trouble
LSU trouble
Check & Remedy
Check the kind and the version of the firmware.
Check or replace the LSU.
Check or replace the PCU PWB.
Trouble content
EEPROM PWB information sum error
Detail
PCU
Cause
EEPROM device trouble.
EEPROM device contact trouble.
Device access error due to noises.
Check & Remedy
Replace the PWB.
Trouble content
Detail
MFP
Cause
A PWB/firmware which is not compatible with the 
machine specifications is detected in the MFPC PWB.
MFPC PWB trouble.
Check & Remedy
Check the kind and the version of the firmware.
Check or replace the MFPC PWB.
Trouble content
Detail
MFP
Cause
Combination error between the MFPC PWB and the 
PCU PWB.
MFPC PWB trouble.
PCU PWB trouble.
Check & Remedy
Check the combination between the MFPC PWB and 
the PCU PWB.
Replace the MFPC PWB.
Replace the PCU PWB.
Trouble content
Detail
MFP
Cause
SCU PWB - MFPC PWB connection trouble.
SCU PWB trouble.
MFPC PWB trouble.
Check & Remedy
Check connection of the SCU PWB and the MFPC 
PWB.
Check the ground.
Replace the SCU PWB.
Replace the MFPC PWB.
Trouble content
Detail
MFP
Cause
PCU PWB - MFPC PWB connection trouble.
PCU PWB trouble.
MFPC PWB trouble.
Check & Remedy
Check connection of the PCU PWB and the MFPC 
PWB.
Check the ground.
Replace the PCU PWB.
Replace the MFPC PWB.
Trouble content
An error of copy image data process occurs. 
(In Non ERDH)
Detail
MFP
Cause
Image data process abnormality
HDD trouble
Image compression data corruption
MFPC PWB trouble
DIMM memory trouble or contact error
Check & Remedy
Use SIM60-01 to check the read/write operations of 
the memory.
Replace the HDD.
Replace the MFPC PWB.
Replace or check installation of the DIMM memory.
Trouble content
An image data process error occurs in the following 
operation mode:
-  Copy (in ERDH)
-  Copy composing system function (Water mark)
-  When in image send
-  When filing documents
-  When displaying the preview
-  When printing with the GDI/PCL printer
-  Copy composing system function (Water mark)
Detail
MFP
Cause
Image data process abnormality
HDD trouble
Image compression data corruption
MFPC PWB trouble
DIMM memory trouble or contact error
Check & Remedy
Use SIM60-01 to check the read/write operations of 
the memory.
Replace the HDD.
Replace the MFPC PWB.
Replace or check installation of the DIMM memory.
MX-7500N  TROUBLESHOOTING  7 – 19
 
E7-94
Image file data process error (when
importing file data)
 
E7-95
MFP PWB DIMM memory check 
error
 
E7-96
MFPC PWB DIMM memory check error
 
E7-A0
LSU EEPROM/LD driver read/write 
error (K)
 
E7-A1
LSU EEPROM/LD driver read/write 
error (C)
 
E7-A2
LSU EEPROM/LD driver read/write 
error (M)
 
E7-A3
LSU EEPROM/LD driver read/write 
error (Y)
 
E7-A5
Installation error of HDD which was
used in the mirroring kit
 
E7-A6
Compact flash memory trouble
Trouble content
File image process error (backup restore error) when 
importing filing data
Detail
MFP
Cause
Image data process abnormality
HDD trouble
Image compression data corruption
MFPC PWB trouble
DIMM memory trouble or contact error
Check & Remedy
Use SIM60-01 to check the read/write operations of 
the memory.
Replace the HDD.
Replace the MFPC PWB.
Replace or check installation of the DIMM memory.
Trouble content
MFP PWB DIMM memory access trouble
Detail
MFP
Cause
Memory data corruption occurs
Printer PWB trouble
DIMM memory trouble or contact error
Check & Remedy
Use SIM60-01 to check the read/write operations of 
the memory.
Replace the printer PWB.
DIMM memory socket check
Replace the DIMM memory.
Trouble content
MFPC PWB DIMM memory access trouble
Detail
MFP
Cause
Memory data corruption occurs
MFPC PWB trouble
DIMM memory trouble or contact error
Check & Remedy
Use SIM60-01 to check the read/write operations of 
the memory.
Replace the MFPC PWB.
DIMM memory socket check
Replace the DIMM memory.
Trouble content
Write error in write sequence of the serial EEPROM/
LD driver for Black
Detail
PCU
Cause
EEPROM/LD driver trouble.
EEPROM/LD driver access circuit trouble.
Check & Remedy
Check connection of the connector and the harness of 
the LD PWB and the PCU PWB.
Replace the PCU PWB.
If the above remedies cannot delete the trouble, 
replace the LSU.
Trouble content
Write error in write sequence of the serial EEPROM/
LD driver for Cyan
Detail
PCU
Cause
EEPROM/LD driver trouble.
EEPROM/LD driver access circuit trouble.
Check & Remedy
Check connection of the connector and the harness of 
the LD PWB and the PCU PWB.
Replace the PCU PWB.
If the above remedies cannot delete the trouble, 
replace the LSU.
Trouble content
Write error in write sequence of the serial EEPROM/
LD driver for Magenta
Detail
PCU
Cause
EEPROM/LD driver trouble.
EEPROM/LD driver access circuit trouble.
Check & Remedy
Check connection of the connector and the harness of 
the LD PWB and the PCU PWB.
Replace the PCU PWB.
If the above remedies cannot delete the trouble, 
replace the LSU.
Trouble content
Write error in write sequence of the serial EEPROM/
LD driver for Yellow
Detail
PCU
Cause
EEPROM/LD driver trouble.
EEPROM/LD driver access circuit trouble.
Check & Remedy
Check connection of the connector and the harness of 
the LD PWB and the PCU PWB.
Replace the PCU PWB.
If the above remedies cannot delete the trouble, 
replace the LSU.
Trouble content
When a HDD which was used in the mirroring kit is 
installed to the MFP without the mirroring kit, its 
operation is restricted in order to prevent against 
malfunction.
Detail
MFP
Cause
A HDD which was used in the mirroring kit is installed 
to the MFP without the mirroring kit.
Check & Remedy
Replace the HDD with one which has not been used 
in the mirroring kit. 
Trouble content
A read/write access error in the compact flash 
memory occurs.
Detail
Cause
Compact flash memory trouble.
MFPC PWB trouble.
File system control area data trouble.
Check & Remedy
Replace the compact flash memory.
Replace the MFPC PWB.
MX-7500N  TROUBLESHOOTING  7 – 20
 
EE-EC
Automatic toner density adjustment 
error
 
EE-EL
Automatic toner density adjustment
error (Over toner)
 
EE-EU
Automatic toner density adjustment
error (Under toner)
 
F0-03
Finisher paper exit roller lift motor
section abnormality (FNM110)
 
F0-08
Finisher stapler shift motor section
abnormality (FNM107)
 
F0-10
Finisher staple motor section 
abnormality (FNM115)
 
F0-11
Finisher bundle exit motor section
abnormality (FNM116)
 
F0-14
Finisher paper rear edge falling motor
section abnormality (FNM113)
 
F0-15
Finisher tray lift motor section 
abnormality (FNM106)
Trouble content
The sampling level in the automatic toner density 
adjustment is outside of 128 +/-10.
Detail
PCU
Cause
Toner density sensor trouble.
Developing unit trouble.
PCU PWB trouble.
Check & Remedy
Replace the toner density sensor.
Replace the developing unit.
Replace the PCU PWB.
Trouble content
The sampling level in the automatic toner density 
adjustment is 76 or less or the control voltage is 208 
or above.
Detail
PCU
Cause
Toner density sensor trouble.
Developing unit trouble.
PCU PWB trouble.
Check & Remedy
Replace the toner density sensor.
Replace the developing unit.
Replace the PCU PWB.
Trouble content
The sampling level in the automatic toner density 
adjustment is 178 or above or the control voltage is 51 
or less.
Detail
PCU
Cause
Toner density sensor trouble.
Developing unit trouble.
PCU PWB trouble.
Check & Remedy
Replace the toner density sensor.
Replace the developing unit.
Replace the PCU PWB.
Trouble content
Finisher paper exit roller lifting operation abnormality.
Detail
PCU
Cause
Motor lock, control PWB trouble, disconnection of 
harness or connector, HP sensor breakdown.
Check & Remedy
Use SIM3-3 to check the operation of the paper exit 
roller lift motor.
Check connection from the control PWB to the motor 
and the sensor.
Replace the control PWB, the motor, and the sensor 
part.
Trouble content
The shift operation of the finisher stapler is abnormal.
Detail
PCU
Cause
Motor lock, control PWB trouble, disconnection of 
harness or connector, HP sensor breakdown.
Check & Remedy
Use SIM3-3 to check the operation of the stapler shift 
motor.
Check connection from the control PWB to the motor 
and the sensor.
Replace the control PWB, the motor, and the sensor 
part.
Trouble content
The operation of the finisher staple is abnormal.
Detail
PCU
Cause
Motor lock, control PWB trouble, disconnection of 
harness or connector, HP sensor breakdown.
Check & Remedy
Use SIM3-3 to check the operation of the staple 
motor.
Check connection from the control PWB to the motor 
and the sensor.
Replace the control PWB, the motor, and the sensor 
part.
Trouble content
The grip expansion arm drive motor of the finisher for 
staple bundle exit is abnormal. HP sensor abnormality.
Detail
PCU
Cause
Motor lock, motor harness short/open, control PWB 
trouble, HP sensor breakdown, disconnection of 
harness or connector.
Check & Remedy
Use SIM3-3 to check the operation of the gripper arm 
motor (FNM116). 
Check connection from the control PWB to the motor.
Replace the control PWB and the sensor part.
Trouble content
The rear edge falling operation in the staple compiler 
of the finisher is abnormal.
Detail
PCU
Cause
Motor lock, control PWB trouble, disconnection of 
harness or connector, HP sensor breakdown.
Check & Remedy
Use SIM3-3 to check the operation of the rear edge 
falling motor. 
Check connection from the control PWB to the motor 
and the sensor.
Replace the control PWB, the motor, and the sensor 
part.
Trouble content
The operation of the lift motor for the upper and the 
lower trays of the finisher is abnormal.
Detail
PCU
Cause
Motor lock, control PWB trouble, disconnection of 
harness or connector, HP sensor breakdown, area 
sensor breakdown.
Check & Remedy
Use SIM3-3 to check the operation of the upper tray 
lift motor and the lower tray lift motor.
Check connection from the control PWB to the motor 
and the sensor.
Replace the control PWB, and motor, and the sensor 
part.
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