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AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 21

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Finisher/saddle sensor 
connector connection 
trouble
The connector 
connection detection 
input of the guide HP 
sensor is off.
The connector 
connection detection 
input of the push lead 
edge sensor is off.

Section

Finisher

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Finisher control PWB 
trouble
Malfunction caused by 
noises

Remedy

Replace the finisher 
control PWB.

Note 

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Finisher/micro switch 
trouble
With all cover PI (photo 
sensor) ON, the transport 
cover MS is off fort 1sec 
continuously from starting 
copying.
With all cover PI (photo 
sensor) ON, the front 
cover MS is off fort 1sec 
continuously from starting 
copying.
With all cover PI (photo 
sensor) ON, the paper 
exit cover MS is off fort 
1sec continuously from 
starting copying.

Section

Finisher

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Finisher control PWB 
trouble
Malfunction caused by 
noises

Remedy

Replace the finisher 
control PWB.

Note 

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Finisher/inserter 
communication trouble

Section

Inserter

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Improper connection or 
disconnection of the 
connector and the 
harness between the 
finisher and the inserter 
unit

Remedy

Check the connector and 
the harness in the 
communication line.

Note 

Case 2

Trouble 
position/
Cause

Finisher control PWB 
trouble
Control PWB (PCU) 
trouble

Remedy

Replace the finisher 
control PWB.

Note 

Case 3

Trouble 
position/
Cause

Malfunction caused by 
noises

Remedy

Canceled by turning ON/
OFF the power.

Note 

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Inserter/EEPROM trouble
Data read failure on 
turning on the power

Section

Inserter

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

EEPROM trouble
Control circuit runaway 
due to noises

Remedy

Check that the EEPROM 
is properly installed.
Replace the inserter 
PWB.

Note 

Case 2

Trouble 
position/
Cause

Inserter PWB EEPROM 
access circuit trouble

Remedy

Replace the inserter 
PWB.

Note 

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 22

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Inserter/reverse sensor 
trouble
Auto adjustment failure 
on turning on the power

Section

Inserter

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Auto adjustment failure 
on turning on the power
Sensor breakage
Harness disconnection
Inserter PWB trouble

Remedy

Use SIM 3-2 to check the 
sensor operation.

Note 

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Toner control sensor 
output open
After completion of auto 
development adjustment, 
during process operation, 
the toner sensor output is 
detected as 0.5V or less 
or 4.5V or above three 
times.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Connector harness 
trouble
Connector not connected.

Remedy

Check connection of the 
toner control sensor.
Check connection of the 
connector harness to the 
main PWB.
Check for disconnection 
of the harness.

Note 

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Toner supply abnormality
Toner remains in the 
toner bottle when 
undertoner is detected by 
the toner concentration 
sensor in the developing 
unit.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Toner concentration 
sensor trouble
Toner remaining quantity 
sensor trouble
Connector harness 
trouble for the above 
sensors.

Remedy

Check connector of 
hopper unit toner motor 
(TM1)
Check connector of toner 
bottle toner motor (TM2)
Check connection of the 
connector harnesses to 
the main PWB.
Check broken harness for 
above connections.
Check output of the toner 
concentration sensor 
(SIM25-1)
Check output of the toner 
remaining quantity sensor 
(SIM10-2)

Note 

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An improper toner bottle 
is inserted.
CRUM (IC chip trouble)

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

IC chip trouble
Improper cartridge

Remedy

Insert a proper cartridge.

Note 

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 23

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Communication with the 
IC chip cannot be made.
Data write failure to the 
CRUM or data read 
failure from the CRUM 
occurs 3 times 
continuously except for 
toner cartridge installation 
detection.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

IC chip trouble
Improper cartridge

Remedy

Insert a proper cartridge.

Note 

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Process control trouble 
(Photoconductor surface 
reflection rate 
abnormality)
Before starting process 
control, the drum surface 
is read by the image 
density sensor to make 
the sensor gain 
adjustment so that the 
output is fixed to a certain 
level. Though the sensor 
gain is changed, the 
output is not fixed to a 
certain level.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Image density sensor 
trouble

Remedy

Use SIM 44-02 to perform 
the process control 
sensor gain adjustment.

Note 

Case 2

Trouble 
position/
Cause

Improper connection of 
the harness between the 
PCU PWB and the image 
density sensor

Remedy

If “Error” is displayed, it 
may be considered as a 
breakdown. Check the 
sensor and the harness.

Note 

Case 3

Trouble 
position/
Cause

The image density sensor 
is dirty.
OPC drum cleaning 
trouble

Remedy

If the adjustment is 
completed, check the 
drum surface conditions.

Note 

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 24

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Process control trouble 
(Drum marking scan 
trouble)
The drum marking size, 
density, or the number of 
units is improper.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Drum marking sensor 
trouble

Remedy

Use SIM 44-02 to perform 
the process control 
sensor gain adjustment.

Note 

Case 2

Trouble 
position/
Cause

Improper connection of 
the harness between the 
PCU PWB and the drum 
marking sensor

Remedy

If “Error” is displayed, it 
may be considered as a 
breakdown. Check the 
sensor and the harness.

Note 

Case 3

Trouble 
position/
Cause

The drum marking sensor 
is dirty.
OPC drum cleaning 
trouble

Remedy

If the adjustment is 
completed, check the 
drum surface conditions.

Note 

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Drum marking sensor 
gain adjustment error
Before starting process 
control, the drum marking 
area surface is read by 
the sensor to make the 
sensor gain adjustment 
so that the output is fixed 
to a certain level. Though 
the sensor gain is 
changed, the output is not 
fixed to a certain level.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Drum marking sensor 
trouble

Remedy

Use SIM 44-02 to perform 
the process control 
sensor gain adjustment.

Note 

Case 2

Trouble 
position/
Cause

Improper connection of 
the harness between the 
PCU PWB and the drum 
marking sensor

Remedy

If “Error” is displayed, it 
may be considered as a 
breakdown. Check the 
sensor and the harness.

Note 

Case 3

Trouble 
position/
Cause

The drum marking sensor 
is dirty.
OPC drum cleaning 
trouble

Remedy

If the adjustment is 
completed, check the 
drum surface conditions.

Note 

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Process thermistor 
breakdown
When the process 
thermistor detection, 
3.03V or above, or 0.28V 
or below is detected 
once.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Improper connection of 
the process thermistor 
harness.

Remedy

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

Note 

Case 2

Trouble 
position/
Cause

Process thermistor 
trouble

Remedy

Replace the process 
thermistor.

Note 

Case 3

Trouble 
position/
Cause

PCU PWB trouble

Remedy

Check the PCU PWB.

Note 

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