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: Feb. 9 2004

AR-M550/M620/M700  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 29

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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 300 (450) 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, when the 
temperature below (*) is 
detected 5 times 
continuously during 
sampling in the interval of 
300(450) msec (EX 
JAPAN):
* H4-02/HL3: 80°C (Fixed 
level)
This temperature is -50°C 
lower than the 
temperature control level 
of H4-00/HL1, H4-01/
HL2.

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/M700  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 30

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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.

Note 

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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/M700  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 31

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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 

: Feb. 9 2004

AR-M550/M620/M700  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 32

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Controller fan motor lock 
detection
The motor lock signal is 
detected during rotation of 
the controller fan motor.
The motor lock signal is 
detected during rotation of 
the HDD fan motor.

Section

Controller

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Fan motor trouble

Remedy

Use SIM 6-2 to check the 
fan motor operation.

Note 

Case 2

Trouble 
position/
Cause

Improper connection of 
the harness between the 
controller PWB and the 
fan motor.
Control circuit trouble

Remedy

Check the harness and 
the connector between 
the controller PWB and 
the fan motor.

Note 

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Paper exit thermistor 
open or short.
When the temperature of 
100°C or above (entered 
value 235) is detected in 
the paper exit thermistor 
3 times or more 
continuously.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Defective contact of 
paper exit thermistor 
harness

Remedy

Check connection of the 
paper exit thermistor 
harness and the connector.

Note 

Case 2

Trouble 
position/
Cause

Fan motor trouble

Remedy

Use SIM 6-2 to check the 
fan motor operation.

Note 

Case 3

Trouble 
position/
Cause

PCU PWB, harness 
connection between fan 
and motor trouble
PCU circuit trouble
Thermistor (TH_EX) 
trouble

Remedy

Check the PCU PWB, the 
harness between fan and 
motor, and the connector.

Note 

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Polygon motor lock 
detection
It is judged that the 
polygon motor lock signal 
of the LSU is not 
outputted.
The polygon motor lock 
signal is checked in an 
interval of 10sec after 
starting the polygon 
motor, and it is found that 
the polygon motor is not 
rotating normally.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Polygon motor trouble

Remedy

Use SIM 61-1 to check 
the polygon motor 
operation.

Note 

Case 2

Trouble 
position/
Cause

Disconnection or 
breakage of the LSU 
connector or the harness 
in the LSU

Remedy

Check connection of the 
harness and the 
connector.
Replace the LSU.

Note 

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The full wave signal is not 
detected.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Disconnection or 
breakage of the PCU 
PWB connector or the 
harness in the power unit

Remedy

Check connection of the 
harness and the 
connector.

Note 

Case 2

Trouble 
position/
Cause

PCU PWB trouble

Remedy

Replace the PCU PWB.

Note 

Case 3

Trouble 
position/
Cause

12V power source trouble

Remedy

Replace the power unit.
Replace the controller 
connection mother board.

Note