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AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 29

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The FAX-BOX PWB is 
not one for the AR-FX8. 
(FAX detection)
If the FAX-BOX modem 
controller PWB 
information (hard 
detection) is not for the 
AR-FX8, it is judged as 
an error.

Section

FAX

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Because the FAX-BOX 
modem controller PWB 
information (hard 
detection) is not for the 
AR-FX8. (The modem 
controller PWB for the 
AR-FX5 or the AR-FX6 is 
used.)

Remedy

Check the FAX-BOX 
modem controller PWB.
Replace it with a modem 
controller PWB for the 
AR-FX8.

Note 

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Combination error of the 
FAX-BOX destination 
information and the 
machine destination 
information
When the destination 
information stored in the 
FAX-BOX EEPROM is 
compared with that of the 
machine, and if the 
combination is improper, 
it is judged as an error.

Section

FAX

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Because of improper 
combination between the 
destination information 
stored in the EEPROM on 
the FAX-BOX PWB and 
that of the machine (set 
with SIM 26-6).

Remedy

Check the destination of 
the FAX-BOX.
Check the machine 
destination with SIM 26-6.
Use a proper combination 
of the machine and the 
FAX-BOX.

Note 

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FAX board EEPROM 
read/write error
ACK from the EEPROM 
cannot be checked.

Section

FAX

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

EEPROM trouble
FAX PWB EEPROM 
access circuit trouble

Remedy

Replace the EEPROM.
Re-setup the soft SW.

Note 

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Thermistor open (An 
input voltage of 2.95V or 
above is detected.)
Fusing unit not installed

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Thermistor trouble
Control PWB trouble
Improper connection of 
the fusing section 
connector
AC power trouble
Fusing unit not installed

Remedy

Check the harness and 
the connector between 
the thermistor and the 
control PWB.
Use SIM 14 to clear the 
self diag display.

Note 

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 30

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Fusing section high 
temperature trouble
The fusing temperature 
exceeds 241.5°C. (An 
input voltage of 0.35V or 
less is detected.)
When fusing temperature 
control is started and a 
temperature of 242°C is 
detected 3 times 
continuously in sampling 
of 100 (150) msec 
interval. (Except for 
Japan)

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Thermistor trouble
Control PWB trouble
Improper connection of 
the fusing section 
connector
AC power trouble

Remedy

Use SIM 5-2 to check 
flashing of the heater 
lamp.
When the lamp flashes 
normally.
• Check the thermistor 

and the harness.

• Check the thermistor 

input circuit on the 
control PWB.

When the lamp keeps 
ON.
• Check the AC PWB 

and the lamp control 
circuit on the control 
PWB.

Use SIM 14 to cancel the 
trouble

Note 

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Fusing section low 
temperature trouble
The set temperature is 
not reached within the 
specified time (normally 4 
min) after turning on the 
power relay.
The heater lamp does not 
turn off in 4 min after 
starting warming up.
After completion of 
warming up, a 
temperature of 80°C is 
detected 5 times 
continuously in sampling 
of 100 (150) msec 
interval. (Except for 
Japan)

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Thermistor trouble
Heater lamp trouble
Control PWB trouble
Thermostat trouble
AC power trouble
Interlock switch

Remedy

Use SIM 5-2 to check 
flashing of the heater 
lamp.
When the lamp flashes 
normally.
• Check the thermistor 

and the harness.

• Check the thermistor 

input circuit on the 
control PWB.

When the lamp does not 
turn on.
• Check for 

disconnection of the 
heater lamp or the 
thermostat.

• Check the interlock 

switch.

• Check the AC PWB 

and the lamp control 
circuit on the control 
PWB.

Use SIM 14 to cancel the 
trouble

Note 

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 31

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5-time continuous POD 
not-reached JAM 
detection
When POD1 not-reached 
jam is detected 5 times 
continuously.
POD1 jam counter is 
backed up and used in a 
print job after turning on 
the power.
The counter is cleared 
when POD1 jam does not 
occur in a job or when the 
trouble is canceled.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

The fusing jam is not 
canceled completely. 
(Jam paper remains.)

Remedy

Check for jam paper in 
the fusing section. 
(Winding, etc.)

Case 2

Trouble 
position/
Cause

POD1 sensor trouble, or 
harness connection 
trouble

Remedy

Check the PODC1 
sensor harness and 
installation of the fusing 
unit.

Case 3

Trouble 
position/
Cause

Fusing unit installation 
trouble

Remedy

Use SIM 14 to cancel the 
trouble

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Scanner feed trouble
Scanner feed is not 
completed within the 
specified time.
When MHP Soft is not 
detected within 2 sec 
after shifting the mirror 
base unit in the feeding 
direction.

Section

Scanner

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Scanner unit trouble
The scanner wire is 
disconnected.

Remedy

Use SIM 1-1 to check 
scanning operation.

Note 

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Scanner return trouble
Scanner return is not 
completed within the 
specified time.
MHPSon is not detected 
within 10sec after starting 
the mirror base unit in the 
return direction.

Section

Scanner

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Scanner unit trouble
The scanner wire is 
disconnected.

Remedy

Use SIM 1-1 to check 
scanning operation.

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Main motor lock detection
Three successive trouble 
signals are detected after 
600 msec from starting 
the main motor.
No trouble is detected 
after 600msec above.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Main motor trouble

Remedy

Use SIM 6-1 to check the 
main motor operation.

Note 

Case 2

Trouble 
position/
Cause

Improper disconnection 
of the harness between 
the PCU PWB and the 
main motor
Control circuit trouble

Remedy

Check the harness and 
the connector between 
the PCU PWB and the 
main motor.

Note 

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 32

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Drum motor lock 
detection
The motor lock signal is 
detected for 1.5sec 
during rotation of the 
drum motor.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Drum motor trouble

Remedy

Use SIM 6-1 to check the 
drum motor operation.

Note 

Case 2

Trouble 
position/
Cause

Improper connection of 
the harness between the 
PCU PWB and the drum 
motor
Control circuit trouble

Remedy

Check the harness and 
the connector of the PCU 
PWB, and the drum 
motor.

Note 

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Fusing motor lock 
detection
Three successive trouble 
signals are detected after 
600 msec from starting 
the fusing motor.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Fusing motor trouble

Remedy

Use SIM 6-1 to check the 
fusing motor operation.

Note 

Case 2

Trouble 
position/
Cause

Improper connection of 
the harness between the 
PCU PWB and the fusing 
motor
Control circuit trouble

Remedy

Check connection of the 
harness and the 
connector between the 
PCU PWB and the fusing 
motor.

Note 

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Developing motor lock 
detection
The motor lock signal is 
detected for 1.5sec 
during rotation of the 
developing motor

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Developing motor trouble

Remedy

Use SIM 6-1 to check the 
developing motor 
operation.

Note 

Case 2

Trouble 
position/
Cause

Improper connection of 
the harness between the 
PCU PWB and the 
developing motor
Control circuit trouble

Remedy

Check the harness and 
the connector between 
the PCU PWB and the 
developing motor.

Note 

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Transfer belt separation 
motor trouble detection
The transfer belt home 
position sensor ON/OFF 
is not detected within the 
specified time (4 sec) 
during operation of the 
transfer belt (separation, 
contact).

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Transfer belt separation 
motor trouble

Remedy

Use SIM 6-1 to check the 
transfer belt motor 
operation.

Note 

Case 2

Trouble 
position/
Cause

Improper connection of 
the harness between the 
PCU PWB and the 
transfer belt separation 
motor.
Control circuit trouble

Remedy

Check connection of the 
harness and the 
connector between the 
PCU PWB and the fusing 
motor.

Note