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

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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 

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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.

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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

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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 

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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 

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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 

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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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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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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