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AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 10

Case 1

Trouble 
position/
Cause

Defective installation of 
the harness to the CIS 
unit

Remedy

Check the harness 
connected to the CIS unit.

Note 

Case 2

Trouble 
position/
Cause

CIS unit abnormality

Remedy

CIS unit check

Note 

Case 3

Trouble 
position/
Cause

Scanner PWB 
abnormality

Remedy

Scanner PWB check

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

While reading/writing the 
HDD system area data, 
the HDD returns an error 
response or no response 
at all for longer than 30 
seconds.

Section

Controller

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

No HDD is installed on 
the MFP control PWB.

Remedy

Check installation status 
of the HDD on the MFP 
control PWB.

Note 

Case 2

Trouble 
position/
Cause

HDD does not properly 
function.

Remedy

• CHECK connection 

between the HDD and 
MFP control.

• Perform an HDD read/

write test using SIM 62-
2/3.

• Replace HDD.

Note 

Case 3

Trouble 
position/
Cause

MFP control PWB 
abnormality

Remedy

Replace the MFP control 
PWB.

Note 

Main 
code

Sub 

code

Title

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

Laser trouble
The BD signal from the 
LSU is kept OFF or ON.
When the polygon motor 
rotation is started and 
three successive BDT 
signals of I/O ASIC are 
detected after forced 
lighting of laser.

Section

Engine

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

The connector to the LSU 
or the harness in the LSU 
is disconnected or 
broken.

Remedy

Check for disconnection 
of the connector to the 
LSU.

Note 

Case 2

Trouble 
position/
Cause

The polygon motor does 
not rotate properly.

Remedy

Check that the polygon 
motor rotated properly or 
not.

Note 

Case 3

Trouble 
position/
Cause

The position of the laser 
home position sensor in 
the LSU is shifted.

Remedy

Use SIM 61-1 to check 
the LSU operation.

Note 

Case 4

Trouble 
position/
Cause

A proper voltage is not 
supplied to the power line 
of the laser.

Remedy

Replace the LSU unit.

Note 

Case 5

Trouble 
position/
Cause

Defective lighting of the 
laser emitting diode

Remedy

Check lighting of the laser 
emitting diode.

Note 

Case 6

Trouble 
position/
Cause

PCU PWB abnormality

Remedy

Replace the PCU PWB.

Note 

Case 7

Trouble 
position/
Cause

MFP control ASIC PWB 
abnormality

Remedy

Replace the MFP control 
PWB.

Note 

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 11

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

HDD trouble
Data abnormality in the 
HDD file management 
area (cluster chain 
corrupted)
The HDD sends an error 
response or does not 
respond for 30 sec.

Section

Controller

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

The HDD is not installed 
properly to the MFP 
control PWB.

Remedy

Check installation of the 
HDD to the MFP control 
PWB.

Note 

Case 2

Trouble 
position/
Cause

The HDD of the MFP 
control PWB does not 
operate properly.

Remedy

Check connection of the 
harness to the HDD of 
the MFP control PWB.
Use SIM 62-2, -3 to 
check read/write of the 
HDD.
Replace the HDD.

Note 

Case 3

Trouble 
position/
Cause

MFP control ASIC PWB 
abnormality

Remedy

Replace the MFP control 
PWB.

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

Decode error trouble
A decode error occurs in 
making an image.

Section

Controller

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Garbled data in input 
from PCI to PM
DM trouble
Data are garbled in image 
compression/transfer.

Remedy

Check installation of the 
PWB. (PCI bus)
If the job at occurrence is 
FAX, check installation of 
the FAX PWB.
For the other cases, 
check the MFP control 
PWB.

Note 

Case 2

Trouble 
position/
Cause

MFP control ASIC PWB 
abnormality

Remedy

Replace the MFP control 
PWB.

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

Shading trouble (Black 
correction)
CCD black scan level 
abnormality when the 
copy lamp is turned off.
When the proper offset 
setup value is not 
obtained at turning on the 
power or CCD shading 
with SIM 63-2.

Section

Scanner

Operation 
mode

Note

Case 1

Trouble 
position/
Cause

Defective installation of 
the flat cable to the CCD 
unit

Remedy

Check installation of the 
flat cable to the CCD unit.

Note

Case 2

Trouble 
position/
Cause

CCD unit abnormality

Remedy

CCD unit check

Note

Case 3

Trouble 
position/
Cause

Scanner PWB 
abnormality

Remedy

Scanner PWB check

Note

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 12

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

Shading trouble (White 
correction all pixel 
adjustment)
The CCD white reference 
plate scan level 
abnormality when lighting 
the copy lamp
When the proper gain 
setup value is not 
obtained at turning on the 
power or CCD shading 
with SIM 63-2.

Section

Scanner

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

Mirror, lens, reference 
white plate dirt

Remedy

Clean the mirror, the lens, 
and the reference white 
plate.

Note 

Case 2

Trouble 
position/
Cause

Copy lamp  lighting 
abnormality

Remedy

Check the light quantity 
and lighting of the copy 
lamp. (SIM 5-3)

Note 

Case 3

Trouble 
position/
Cause

Defective installation of 
the flat cable to the CCD 
unit
Improper installation of 
the CCD unit
CCD unit abnormality

Remedy

CCD unit check

Note 

Case 4

Trouble 
position/
Cause

Scanner PWB 
abnormality

Remedy

Scanner PWB check

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

Shading trouble (White 
correction center 
adjustment)
The CCD white reference 
plate scan level 
abnormality when lighting 
the copy lamp
When the proper gain 
setup value is not 
obtained at turning on the 
power or CCD shading 
with SIM 63-2.

Section

Scanner

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Mirror, lens, reference 
white plate dirt

Remedy

Clean the mirror, the lens, 
and the reference white 
plate.

Note 

Case 2

Trouble 
position/
Cause

Copy lamp  lighting 
abnormality

Remedy

Check the light quantity 
and lighting of the copy 
lamp. (SIM 5-3)

Note 

Case 3

Trouble 
position/
Cause

Defective installation of 
the flat cable to the CCD 
unit
Improper installation of 
the CCD unit
CCD unit abnormality

Remedy

CCD unit check

Note 

Case 4

Trouble 
position/
Cause

Scanner PWB 
abnormality

Remedy

Scanner PWB check

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

CCD communication 
trouble
Communication trouble 
between the scanner 
PWB and the CCD-ASIC. 
(Clock synchronization)
When an error occurs in 
the access check to the 
CCD-ASIC executed at 
turning on the power.

Section

Scanner

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Defective installation of 
the harness connected to 
the CCD unit

Remedy

Check the harness 
connected to the CCD 
unit.

Note 

Case 2

Trouble 
position/
Cause

CCD unit abnormality

Remedy

CCD unit check

Note 

Case 3

Trouble 
position/
Cause

Scanner PWB 
abnormality

Remedy

Scanner PWB check

Note 

Main 
code

Sub 

code

Title

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

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

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 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

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 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

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 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

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 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

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 

Main 
code

Sub 

code

Title