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AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 13

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LSU connection trouble
The LSU connected does 
not conform to the 
machine specifications.
When the combination of 
the pattern of an input 
port on the PCU and the 
pattern of a port 
connected to the LSU is 
not proper.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

LSU connection trouble

Remedy

Check connection 
between the PCU and the 
LSU and the harness.

Note 

Case 2

Trouble 
position/
Cause

PCU PWB trouble
LSU trouble

Remedy

Check the LSU. Check 
the PCU.

Note 

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Incompatibility check 
trouble
An error is detected in the 
internal incompatibility 
check in the engine 
(PCU).

Section

Engine (PCU)

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

PCU PWB trouble or a 
improper PCU PWB has 
been installed.

Remedy

Check the PCU PWB.

Note 

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Controller connection 
trouble
Incompatibility trouble 
between the controller 
and the engine

Section

Controller

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Improper combination 
of the controller PWB 
and the engine

Remedy

Check the controller 
PWB.
Check combination of 
the controller PWB and 
the engine.

Note 

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Incompatibility check 
trouble
An error is detected in 
the internal 
incompatibility check in 
the MFP control PWB.

Section

MFP control PWB

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

MFP control PWB 
trouble or a improper 
MFP control PWB has 
been installed.

Remedy

Check the MFP control 
PWB and repair it as 
required.

Note 

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Communication trouble 
between the MFP control 
and the scanner (MFP 
control detection)
Communication 
establishment error/ 
framing/ parity/ protocol 
error
Follows the 
communication protocol 
specifications.
Communication error, 
timing abnormality of the 
communication data and 
the communication signal 
line

Section

Controller

Operation 
mode

Note 

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AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 14

Case 1

Trouble 
position/
Cause

Defective connection of 
the slave unit PWB 
connector
Defective harness 
between the slave unit 
PWB and the MFP 
control PWB
Slave unit PWB mother 
board connector pin 
breakage

Remedy

Check connection of the 
connector between the 
slave unit PWB and the 
MFP control PWB and 
the harness.
Check grounding of the 
machine.

Note 

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Phenomenon

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Message

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MFP control-PCU 
communication trouble 
(MFP control detection)
Communication 
establishment error/ 
framing/ parity/ protocol 
error
Follows the 
communication protocol 
specifications.
Communication error, 
timing abnormality of the 
communication data and 
the communication signal 
line

Section

Controller

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Defective connection of 
the slave unit PWB 
connector
Defective harness 
between the slave unit 
PWB and the MFP 
control PWB
Slave unit PWB mother 
board connector pin 
breakage

Remedy

Check connection of the 
connector between the 
slave unit PWB and the 
MFP control PWB and 
the harness.
Check grounding of the 
machine.

Note 

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Auto developer 
adjustment trouble 
(Overtoner error)
When executing the 
automatic development 
adjustment, toner 
concentration sensor 
output level is 1.5V or 
below.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Toner density sensor 
trouble
Charging voltage and 
developing voltage 
trouble
Toner density trouble
Developing unit trouble
PCU PWB trouble

Remedy

Use SIM 25-2 to perform 
the automatic developing 
adjustment.

Note 

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Message

Details

Auto developer 
adjustment trouble 
(Undertoner error)
When executing the 
automatic development 
adjustment, toner 
concentration sensor 
output level is 3.5V or 
above.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Toner density sensor 
trouble
Charging voltage and 
developing voltage 
trouble
Toner density trouble
Developing unit trouble
PCU PWB trouble

Remedy

Use SIM 25-2 to perform 
the automatic developing 
adjustment.

Note 

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 15

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Finisher communication 
trouble
An error in the 
communication line test 
after turning on the power 
or canceling the 
simulation
Communication error with 
the finisher
Follows the 
communication protocol 
specifications.
Communication error, 
timing abnormality of the 
communication data and 
the communication signal 
line

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Improper connection or 
disconnection of the 
connector or harness 
between the machine and 
the finisher

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 or the PCU 
PWB.

Note 

Case 3

Trouble 
position/
Cause

Malfunction caused by 
noises

Remedy

Canceled by turning ON/
OFF the power.

Note 

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Finisher transport motor 
abnormality
When opening the shutter 
unit, the opening process 
is not completed in 1sec.
When closing the shutter 
unit, the closing process 
is not completed in 1sec.
When the tray lift unit is 
operating in the 
dangerous area, “Not 
closed state” of the 
shutter close sensor is 
detected.

Section

Finisher

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Motor lock
Motor RPM abnormality
Overcurrent to the motor
Finisher control PWB 
trouble

Remedy

Use SIM 3-3 to check the 
transport motor operation.

Note 

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Finisher oscillation motor 
trouble
When opening the 
oscillation unit, the 
opening process is not 
completed in 1sec.
When closing the 
oscillation unit, the 
closing operation is not 
completed in 3sec.
When the tray lift unit is 
operating in the 
dangerous area, “Not 
closed state” of the 
oscillation unit close 
sensor is detected.
When controlling the 
oscillation unit speed, the 
encoder input cannot be 
detected within a 
specified time.

Section

Finisher

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Motor lock
Motor RPM abnormality
Overcurrent to the motor
Finisher control PWB 
trouble

Remedy

Use SIM 3-3 to check the 
motor operation.

Note 

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 16

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Finisher staple shift motor 
trouble
When the stapler shift 
motor does not move 
from the hope position in 
4sec when operating the 
stapler shift motor.
When the stapler shift 
motor does not return to 
the home position in 4sec 
when operating the 
stapler shift motor.

Section

Finisher

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Motor lock
Motor RPM abnormality
Overcurrent to the motor
Finisher control PWB 
trouble

Remedy

Use SIM 3-3 to check the 
staple shift motor 
operation.

Note 

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Finisher load capacity 
sensor trouble
When the received data 
on performing the sensor 
test at turning on the 
power are outside the 
specified range.
When the detected data 
on calculation of the 
correction value are 
outside the specified 
range.

Section

Finisher

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Sensor breakage
Harness disconnection
Console finisher control 
PWB trouble

Remedy

Use SIM 3-2 to check the 
sensor operation.

Note 

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Finisher/staple motor 
trouble
When the staple unit 
does not shift from HP 
within 0.5sec in staple 
process.
When a stapler jam is 
detected and the staple 
motor is reversed, the 
staple motor does not 
return to HP in 0.5sec.

Section

Finisher

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Motor lock
Motor RPM abnormality
Overcurrent to the motor
Finisher control PWB 
trouble

Remedy

Use SIM 3-3 to check the 
staple shift motor 
operation.

Note 

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Finisher/pusher motor 
trouble
When learning the paper 
exit roller speed, the 
process is not completed 
in 10sec.
When controlling the 
paper exit roller speed, 
an encoder input is not 
detected in a specified 
time.

Section

Finisher

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Motor lock
Motor RPM abnormality
Overcurrent to the motor
Finisher control PWB 
trouble

Remedy

Use SIM 3-3 to check the 
pusher motor operation 
and the paddle solenoid 
operation, or use SIM 3-2 
to check the boomerang 
rotations sensor.

Note