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AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 25

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Developing thermistor 
open or short.
Three successive values 
of 244 or above, or values 
of 20 or below, are 
detected at the 
developing thermistor.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Developing thermistor 
harness connection 
trouble

Remedy

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

Note 

Case 2

Trouble 
position/
Cause

Developing thermistor 
trouble

Remedy

Check the developing 
thermistor

Note 

Case 3

Trouble 
position/
Cause

PCU PWB trouble

Remedy

Check the PCU PWB.

Note 

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Room temperature 
thermistor open or short.
Three successive values 
of 235 or above, or  
values of 22 or below, are 
detected at the room 
temperature thermistor.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Room temperature 
thermistor harness 
connection trouble

Remedy

Check connection of the 
connector and the 
harness of the room 
temperature thermistor.

Note 

Case 2

Trouble 
position/
Cause

Room temperature 
thermistor trouble

Remedy

Check the room 
temperature thermistor

Note 

Case 3

Trouble 
position/
Cause

PCU PWB trouble

Remedy

Check the PCU PWB.

Note 

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Developing humidity 
sensor open or short.
A value of greater than or 
equal to 255 or above, or  
value of 38 or below, is 
detected at the 
developing humidity 
sensor.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Developing humidity 
sensor harness 
connection trouble

Remedy

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

Note 

Case 2

Trouble 
position/
Cause

Developing humidity 
sensor trouble

Remedy

Check the developing 
humidity sensor

Note 

Case 3

Trouble 
position/
Cause

PCU PWB trouble

Remedy

Check the PCU PWB.

Note 

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AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 26

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Machine tray 1 lift-up 
trouble
PED does not turn on 
within the specified time.
LUD does not turn on 
within the specified time.
The trouble occurs 3 
times continuously that 
the upper limit sensor 
does not turn on by lift-up 
operation for 21sec when 
inserting a tray or for 2sec 
when printing.
For the first and the 
second times, guide the 
user to pull out the tray in 
case of a tray size error.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

PED, LUD trouble
No. 1 tray lift-up motor 
trouble
Improper connection of 
the harness of the PCU 
PWB, the lift-up unit, and 
the paper feed unit

Remedy

Check the harness and 
connector of PED and 
LUD
Lift-up trouble unit check.
Use SIM 15 to cancel the 
trouble.

Note 

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Machine tray 2 lift-up 
trouble
MCPED does not turn on 
within the specified time.
MCLUD does not turn on 
within the specified time.
The trouble occurs 3 
times continuously that 
the upper limit sensor 
does not turn on by lift-up 
operation for 10sec when 
inserting a tray or for 
2sec when printing.
For the first and the 
second times, guide the 
user to pull out the tray in 
case of a tray size error.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

MCPED, MCLUD trouble
No. 2 tray lift-up motor 
trouble
Improper connection of 
the harness of the PCU 
PWB, the lift-up unit, and 
the paper feed unit

Remedy

Check the harness and 
the connector of MCPED 
and MCLUD.
Lift-up trouble unit check.
Use SIM 15 to cancel the 
trouble.

Note 

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Machine tray 3 lift-up 
trouble
MCPED does not turn on 
within the specified time.
MCLUD does not turn on 
within the specified time.
The trouble occurs 3 
times continuously that 
the upper limit sensor 
does not turn on by lift-up 
operation for 10sec when 
inserting a tray or for 2sec 
when printing.
For the first and the 
second times, guide the 
user to pull out the tray in 
case of a tray size error.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

MCPED, MCLUD trouble
No. 3 tray lift-up motor 
trouble
Improper connection of 
the harness of the PCU 
PWB, the lift-up unit, and 
the paper feed unit

Remedy

Check the harness and 
the connector of MCPED 
and MCLUD.
Lift-up trouble unit check

Note 

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AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 27

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Machine tray 4 lift-up 
trouble
MCPED does not turn on 
within the specified time.
MCLUD does not turn on 
within the specified time.
The trouble occurs 3 
times continuously that 
the upper limit sensor 
does not turn on by lift-up 
operation for 10sec when 
inserting a tray or for 2sec 
when printing.
For the first and the 
second times, guide the 
user to pull out the tray in 
case of a tray size error.

Section

Engine

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

MCPED, MCLUD trouble
No. 4 tray lift-up motor 
trouble
Improper connection of 
the harness of the PCU 
PWB, the lift-up unit, and 
the paper feed unit

Remedy

Check the harness and 
the connector of MCPED 
and MCLUD.
Lift-up trouble unit check

Note 

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38V voltage falls or rises.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Improper connection or 
disconnection of the 
connector and the 
harness

Remedy

Check the connector and 
the harness of the power 
line.

Note 

Case 2

Trouble 
position/
Cause

PCU PWB trouble
Power unit trouble

Remedy

Check 38V power source 
in the power unit and the 
PCU PWB.

Note 

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MFP control-FAX 
communication trouble 
(MFP control detection)
The booting sequence by 
the command line 
(9600bps, serial) is not 
completed normally.
Communication 
establishment error/ 
framing/ parity/ protocol 
error

Section

FAX

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

Use SIM 25-2 to perform 
the automatic developing 
adjustment.
Check connection of the 
connector between the 
slave unit PWB and the 
MFP control PWB and 
the harness.

Note 

Check grounding of the 
machine.

Case 2

Trouble 
position/
Cause

Slave unit ROM trouble/ 
no ROM/ Reversed 
insertion of ROM/ ROM 
pin breakage

Remedy

Check the ROM on the 
slave unit PWB.

Note 

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 28

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FAX expansion Flash 
memory trouble (MFP 
control detection)
The expansion flash 
memory inserted to the 
FAX I/F PWB could not 
be cleared.

Section

FAX

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Initialization of the FAX 
expansion memory failed, 
which is required for a 
new memory that is 
inserted to the PWB.

Remedy

Use SIM 66-10 to clear 
the expansion flash 
memory.

Note 

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FAX modem operation 
abnormality
The initializing process of 
the modem chip in the 
FAX PWB is not 
completed normally.

Section

FAX

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

SW101 in the FAX PWB 
tries to perform normal 
operation on the boot 
side.

Remedy

Set SW101 on the FAX 
PWB to other than the 
boot side, and turn on the 
power again.

Note 

Case 2

Trouble 
position/
Cause

FAX PWB modem chip 
operation trouble

Remedy

Replace the FAX PWB.

Note 

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The write protect jumper 
of the FAX interface PWB 
is released.

Section

FAX

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

The FAX write protect pin 
is set to Write Enable.

Remedy

Check the write protect 
pin in the FAX interface 
PWB.

Note 

Case 2

Trouble 
position/
Cause

FAX interface PWB 
trouble
FAX PWB trouble

Remedy

Replace the FAX PWB. 
Replace the FAX 
interface PWB.

Note 

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Combination error of TEL/
LIU PWB and software
If the destination of the 
installed TEL/LIU PWB 
differs from that of the 
FAX soft switch, it is 
judged as an error.

Section

FAX

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

The destination of the 
installed TEL/LIU PWB 
differs.
The FAX PWB 
information (soft switch) 
differs.

Remedy

Check the destination of 
the TEL/LIU PWB.
Check the FAX PWB 
information (soft switch).

Note 

Case 2

Trouble 
position/
Cause

TEL/LIU PWB trouble

Remedy

Replace the TEL/LIU 
PWB.

Note