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MX-7000N  SELF DIAG AND TROUBLE CODE  8 – 16

 

 

 

 

 

 

 

 

 

 

 

Trouble content

Positioning plate motor operation trouble

Section

PCU

Case 1

Cause

Motor trouble, HP sensor trouble, harness 
disconnection, finisher control PWB trouble

Check and 
remedy

Use SIM3-3 to check the operation of the paper 
positioning plate motor.
Replace the finisher control PWB.

Trouble content

Guide motor operation trouble

Section

PCU

Case 1

Cause

Motor trouble, HP sensor trouble, harness 
disconnection, finisher control PWB trouble

Check and 
remedy

Use SIM3-3 to check the operation of the guide 
motor.
Replace the finisher control PWB.

Trouble content

Side alignment motor operation trouble

Section

PCU

Case 1

Cause

Motor trouble, HP sensor trouble, harness 
disconnection, finisher control PWB trouble

Check and 
remedy

Use SIM3-3 to check the operation of the 
alignment motor.
Replace the finisher control PWB.

Trouble content

Rear stitch motor operation trouble

Section

PCU

Case 1

Cause

Motor trouble, HP sensor trouble, harness 
disconnection, finisher control PWB trouble

Check and 
remedy

Use SIM3-3 to check the operation of the rear 
stitch motor.
Replace the finisher control PWB.

Trouble content

Front stitch motor operation trouble

Section

PCU

Case 1

Cause

Motor trouble, HP sensor trouble, harness 
disconnection, finisher control PWB trouble

Check and 
remedy

Use SIM3-3 to check the operation of the front 
stitch motor.
Replace the finisher control PWB.

Trouble content

Paper pushing motor operation trouble

Section

PCU

Case 1

Cause

Motor trouble, HP sensor trouble, harness 
disconnection, finisher control PWB trouble

Check and 
remedy

Use SIM3-3 to check the operation of the paper 
pushing motor.
Replace the finisher control PWB.

Trouble content

Detection of finisher incompatible with MX-5500N/
6200N/7000N

Section

PCU

Case 1

Cause

Connection of the AR-F13, etc. which is 
incompatible with MX-5500N/6200N/7000N is 
detected.

Check and 
remedy

Connect the MX-FNX3/MX-FNX4.

Trouble content

Sensor operation trouble

Section

PCU

Case 1

Cause

Sensor trouble, harness disconnection, finisher 
control PWB trouble

Check and 
remedy

Use SIM3-2 to check the operation of the guide HP 
sensor, the paper pushing plate HP sensor, and 
the paper pushing plate lead edge sensor.
Replace the finisher control PWB.

Trouble content

Micro SW operation trouble

Section

PCU

Case 1

Cause

Sensor trouble, harness disconnection, finisher 
control PWB trouble

Check and 
remedy

Use SIM3-2 to check the operation of the inlet port 
cover open/close sensor and the paper exit cover 
open/close sensor.
Replace the finisher control PWB.

Trouble content

Communication error between the finisher and the 
inserter

Section

PCU

Case 1

Cause

Malfunction due to electrical noises.

Check and 
remedy

Turn ON/OFF the power to cancel the error.

Case 2

Cause

Connection trouble or disconnection of the 
connector and the harness between the finisher 
and the inserter. Finisher control PWB trouble, 
inserter control PWB trouble

Check and 
remedy

Check the connector and the harness in the 
communication line. Replace the finisher control 
PWB. Replace the inserter control PWB.

Trouble content

EEPROM trouble

Section

PCU

Case 1

Cause

EEPROM trouble, finisher control PWB trouble, 
inserter control PWB trouble

Check and 
remedy

Replace the finisher control PWB. 
Replace the inserter control PWB.

MX-7000N  SELF DIAG AND TROUBLE CODE  8 – 17

 

 

 

 

 

 

 

 

Trouble content

Sensor adjustment failure

Section

PCU

Case 1

Cause

Sensor trouble, harness disconnection, finisher 
control PWB trouble, inserter control PWB trouble

Check and 
remedy

Use SIM3-2 to check the operation of the inlet port 
cover open/close sensor and the paper exit cover 
open/close sensor.
Replace the finisher control PWB.
Replace the inserter control PWB.

Trouble content

Toner end with the remaining quantity of 25% or 
more.
The toner supply time exceeds 5 times as much as 
the specified time.

Section

PCU

Case 1

Cause

Toner motor section connector harness trouble

Check and 
remedy

Check the connector connection of the toner motor 
section.
Check the connector harness (TM) connection to 
the main PWB.

Case 2

Cause

Toner motor and toner density sensor trouble.
Piezoelectric sensor abnormality

Check and 
remedy

1)

Check the toner density sensor output. 
(SIM25-1)

2)

Check that the toner transport pipe is not 
clogged between the toner cartridge and the 
developing unit. Replace the toner cartridge 
(CRUM) if necessary. Intermediate hopper 
replacement

3)

If replacement of the toner cartridge (CRUM) 
does not clear the trouble, check the 
developing unit.

Trouble content

Improper data are detected in the CRUM contents 
when the normal CRUM of the cartridge is 
detected.

Section

PCU

Case 1

Cause

An improper cartridge is inserted.
Toner cartridge trouble

Check and 
remedy

Replace the toner cartridge.

Trouble content

CRUM cannot be read or written.

Section

PCU

Case 1

Cause

Connection trouble or disconnection of the 
connector and the harness between the PCU and 
the toner cartridge.

Check and 
remedy

Check the connector and the harness between the 
PCU and the toner cartridge.

Case 2

Cause

CRUM trouble

Check and 
remedy

Replace the toner cartridge.

Case 3

Cause

PCU PWB trouble

Check and 
remedy

Replace the PCU PWB.

Trouble content

Process thermistor open

Section

PCU

Case 1

Cause

Process thermistor harness connection trouble

Check and 
remedy

Check the connection of the harness and 
connector of the process thermistor.

Case 2

Cause

Process thermistor trouble

Check and 
remedy

Check the connection of the harness and 
connector of the process thermistor.

Case 3

Cause

PCU PWB trouble

Check and 
remedy

Check the PCU PWB.

Trouble content

Toner empty sensor output abnormality. Sample 
level 25 or less or 231 or above.

Section

PCU

Case 1

Cause

The connector is not installed.

Check and 
remedy

Check the connection of the connector harness to 
the PCU PWB. Check the connection of the toner 
empty sensor. 

Case 2

Cause

Connector harness trouble

Check and 
remedy

Check the harness disconnection.

Case 3

Cause

Cartridge trouble

Check and 
remedy

Check the cartridge connection.

Trouble content

Toner empty sensor output abnormality. Sample 
level 25 or less or 231 or above.

Section

PCU

Case 1

Cause

The connector is not installed.

Check and 
remedy

Check the connection of the connector harness to 
the PCU PWB. Check the connection of the toner 
empty sensor. 

Case 2

Cause

Connector harness trouble

Check and 
remedy

Check the harness disconnection.

Case 3

Cause

Cartridge trouble

Check and 
remedy

Check the cartridge connection.

Trouble content

Toner empty sensor output abnormality. Sample 
level 25 or less or 231 or above.

Section

PCU

Case 1

Cause

The connector is not installed.

Check and 
remedy

Check the connection of the connector harness to 
the PCU PWB. Check the connection of the toner 
empty sensor. 

Case 2

Cause

Connector harness trouble

Check and 
remedy

Check the harness disconnection.

Case 3

Cause

Cartridge trouble

Check and 
remedy

Check the cartridge connection.

MX-7000N  SELF DIAG AND TROUBLE CODE  8 – 18

 

 

 

 

 

 

Trouble content

Toner empty sensor output abnormality. Sample 
level 25 or less or 231 or above.

Section

PCU

Case 1

Cause

The connector is not installed.

Check and 
remedy

Check the connection of the connector harness to 
the PCU PWB. Check the connection of the toner 
empty sensor. 

Case 2

Cause

Connector harness trouble

Check and 
remedy

Check the harness disconnection.

Case 3

Cause

Cartridge trouble

Check and 
remedy

Check the cartridge connection.

Trouble content

The transfer belt surface is scanned by the image 
density sensor before starting the process control, 
and adjust the sensor gain so that the output is 
kept at a certain level. However, the output is not 
within the specified range though the senor gain is 
adjusted.

Section

PCU

Case 1

Cause

Image density sensor trouble, harness connection 
trouble between PCU PWB and the image density 
sensor, image density sensor dirt, transfer belt 
cleaning trouble, calibration plate solenoid 
operation trouble

Check and 
remedy

Use SIM44-2 to execute the process control 
sensor gain adjustment. If "ERROR" is displayed, 
check the sensor, the  harness and the calibration 
plate solenoid operation for any trouble. If the 
adjustment is completed, check the transfer belt 
surface state. 

Trouble content

The calibration plate surface is scanned by the 
image density sensor before starting the process 
control, and adjust the sensor gain so that the 
output is kept at a certain level. However, the 
output is not within the certain level though the 
senor gain is adjusted.

Section

PCU

Case 1

Cause

Image density sensor trouble, harness connection 
trouble between PCU PWB and the image density 
sensor, image density sensor dirt, calibration plate 
dirt, calibration plate solenoid operation trouble

Check and 
remedy

Use SIM44-2 to execute the process control 
sensor gain adjustment. If "ERROR" is displayed, 
check the sensor and the harness operation for 
any trouble. If the adjustment is completed, check 
the calibration plate solenoid operation.

Trouble content

The detection temperature is out of the range of 
-28

°C to 78°C.

Section

PCU

Case 1

Cause

LSU thermistor harness connection trouble

Check and 
remedy

Check the connection of the LSU thermistor 
harness and connector.

Case 2

Cause

LSU thermistor trouble, PCU PWB trouble

Check and 
remedy

Replace the LSU thermistor. Replace the PCU 
PWB.

Trouble content

Detection is made by interruption of light in the 
sensor section of the projection rib on the drum 
drive gear to control the BK drum phase. The 
detection signal cannot be acquired and phase 
control cannot be made.

Section

PCU

Case 1

Cause

Sensor connector connection trouble

Check and 
remedy

Check the sensor connector connection.

Case 2

Cause

Dirt on the sensor light emitting section, or 
installation trouble

Check and 
remedy

Check for dirt on the sensor or check the 
installation state.

Case 3

Cause

Drum drive gear upper rib breakage, sensor 
trouble

Check and 
remedy

If there is no trouble in the rib, replace the sensor. 
(Use SIM30-1 "DHPD_K" to check interruption or 
transmission of light.)

Trouble content

Detection is made by interruption of light in the 
sensor section of the projection rib on the drum 
drive gear to control the color drum (C) phase. The 
detection signal cannot be acquired and phase 
control cannot be made.

Section

PCU

Case 1

Cause

Sensor connector connection trouble

Check and 
remedy

Check the sensor connector connection.

Case 2

Cause

Dirt on the sensor light emitting section, or 
installation trouble

Check and 
remedy

Check for dirt on the sensor or check the 
installation state.

Case 3

Cause

Drum drive gear upper rib breakage, sensor 
trouble

Check and 
remedy

If there is no trouble in the rib, replace the sensor. 
(Use SIM30-1 "DHPD_C" to check interruption or 
transmission of light.)

MX-7000N  SELF DIAG AND TROUBLE CODE  8 – 19

 

 

 

 

 

 

Trouble content

Detection is made by interruption of light in the 
sensor section of the projection rib on the drum 
drive gear to control the color drum (M) phase. The 
detection signal cannot be acquired and phase 
control cannot be made.

Section

PCU

Case 1

Cause

Sensor connector connection trouble

Check and 
remedy

Check the sensor connector connection.

Case 2

Cause

Dirt on the sensor light emitting section, or 
installation trouble

Check and 
remedy

Check for dirt on the sensor or check the 
installation state.

Case 3

Cause

Drum drive gear upper rib breakage, sensor 
trouble

Check and 
remedy

If there is no trouble in the rib, replace the sensor. 
(Use SIM30-1 "DHPD_M" to check interruption or 
transmission of light.)

Trouble content

Detection is made by interruption of light in the 
sensor section of the projection rib on the drum 
drive gear to control the color drum (Y) phase. The 
detection signal cannot be acquired and phase 
control cannot be made.

Section

PCU

Case 1

Cause

Sensor connector connection trouble

Check and 
remedy

Check the sensor connector connection.

Case 2

Cause

Dirt on the sensor light emitting section, or 
installation trouble

Check and 
remedy

Check for dirt on the sensor or check the 
installation state.

Case 3

Cause

Drum drive gear upper rib breakage, sensor 
trouble

Check and 
remedy

If there is no trouble in the rib, replace the sensor. 
(Use SIM30-1 "DHPD_Y" to check interruption or 
transmission of light.)

Trouble content

Process humidity sensor open

Section

PCU

Case 1

Cause

Process humidity sensor harness connection 
trouble

Check and 
remedy

Check the harness and connector connection of 
the process humidity sensor.

Case 2

Cause

Process humidity sensor trouble

Check and 
remedy

Check the process humidity sensor.

Case 3

Cause

PCU PWB trouble

Check and 
remedy

Check the PCU PWB.

Trouble content

Toner end with the remaining quantity of 25% or 
more.
The toner supply time exceeds 5 times as much as 
the specified time.

Section

PCU

Case 1

Cause

Toner motor section connector harness trouble

Check and 
remedy

Check the connector connection of the toner motor 
section.
Check the connector harness (TM) connection to 
the main PWB.

Case 2

Cause

Toner motor and toner density sensor trouble.
Piezoelectric sensor abnormality

Check and 
remedy

1)

Check the toner density sensor output. 
(SIM25-1)

2)

Check that the toner transport pipe is not 
clogged between the toner cartridge and the 
developing unit. Replace the toner cartridge 
(CRUM) if necessary. Intermediate hopper 
replacement

3)

If replacement of the toner cartridge (CRUM) 
does not clear the trouble, check the 
developing unit.

Trouble content

Toner end with the remaining quantity of 75% or 
more.
The toner supply time exceeds 3 times as much as 
the specified time.

Section

PCU

Case 1

Cause

Toner motor section connector harness trouble

Check and 
remedy

Check the connector connection of the toner motor 
section.
Check the connector harness (TM) connection to 
the main PWB.

Case 2

Cause

Toner motor and toner density sensor trouble

Check and 
remedy

1)

Check the toner density sensor output. 
(SIM25-1)

2)

Check that the toner transport pipe is not 
clogged between the toner cartridge and the 
developing unit. Replace the toner cartridge 
(CRUM) if necessary.

3)

If replacement of the toner cartridge (CRUM) 
does not clear the trouble, check the 
developing unit.

Trouble content

Toner end with the remaining quantity of 75% or 
more.
The toner supply time exceeds 3 times as much as 
the specified time.

Section

PCU

Case 1

Cause

Toner motor section connector harness trouble

Check and 
remedy

Check the connector connection of the toner motor 
section.
Check the connector harness (TM) connection to 
the main PWB.

Case 2

Cause

Toner motor and toner density sensor trouble

Check and 
remedy

1)

Check the toner density sensor output. 
(SIM25-1)

2)

Check that the toner transport pipe is not 
clogged between the toner cartridge and the 
developing unit. Replace the toner cartridge 
(CRUM) if necessary.

3)

If replacement of the toner cartridge (CRUM) 
does not clear the trouble, check the 
developing unit.