AR-M550 (serv.man16). (9) Self diag message and troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 34

AR-M550/M620  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 34

Main 
code

Sub 

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Title

Phenomenon

Display

Lamp
Message

Details

The copy inhibit 
command is received 
from the RIC (host). (By 
PPC communication 
standards.)

Section

Controller

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Judged by the host.

Remedy

Notification to the host

Note 

Main 
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Phenomenon

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Lamp

Message

Details

FAX battery abnormality
FAX backup SRAM 
battery voltage fall

Section

FAX

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

Battery life

Remedy

Check that the battery 
voltage is about 2.5V or 
above.

Note 

Case 2

Trouble 
position/
Cause

Battery circuit trouble

Remedy

Check the battery circuit.

Note 

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Phenomenon

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Lamp

Message

Details

RTC read error 
(combined use as FAX, 
on MFP control PWB)
The read value from the 
RTC on the MFP control 
PWB is abnormal such as 
“EE”h.

Section

Controller

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

RTC circuit trouble

Remedy

Make the time setup 
again with the key 
operation and check that 
the time advances 
normally.
Check the RTC circuit.

Note 

Case 2

Trouble 
position/
Cause

Battery voltage fall

Remedy

Check that the battery 
voltage is about 2.5V or 
above.

Note 

Case 3

Trouble 
position/
Cause

Battery circuit trouble

Remedy

Check the battery circuit.

Note 

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Phenomenon

Display

Lamp

Message

Details

EEPROM write error

Section

Controller

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

EEPROM trouble

Remedy

Check that the EEPROM 
is properly installed.
In the simulation to 
prevent against delete of 
the counter data/
adjustment values, write 
down the counter/
adjustment values.

Note 

Case 2

Trouble 
position/
Cause

Insertion of EEPROM 
which is not initialized

Remedy

Use SIM 16 to cancel the 
U2 trouble.

Note 

Case 3

Trouble 
position/
Cause

MFP control PWB 
EEPROM access circuit 
trouble

Remedy

Replace the MFP control 
PWB.

Note 

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