AR-M550/M620/M700 SELF DIAG MESSAGE AND TROUBLESHOOTING 9 - 14
E7 80 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
Main
code
Sub
code
Title
MFP control-PCU communication
trouble (MFP control detection)
E7 90 Phenomenon Display Lamp
Message
Details 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
Main
code
Sub
code
Title
Communication trouble between
the MFP control and the scanner
(MFP control detection)
Main
code
Sub
code
Title
Auto developer adjustment trouble
(Overtoner error)
EE EL Phenomenon Display Lamp
Message
Details 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
Main
code
Sub
code
Title
Auto developer adjustment trouble
(Undertoner error)
EE EU Phenomenon Display Lamp
Message
Details 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
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