AR-M700 (serv.man28). Self diag message and troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 36

AR-M550/M620/M700  SELF DIAG MESSAGE AND TROUBLESHOOTING  9 - 36

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

EEPROM red/write error 
(Scanner)
EEPROM communication 
trouble (NACK detection) 
Retry 3 times

Section

Scanner

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

Scanner PWB EEPROM 
access circuit trouble

Remedy

Replace the scanner 
PWB.

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp
Message

Details

Memory check sum error 
(Scanner)
When counter data sum 
error is detected.

Section

Scanner

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

Control circuit runaway 
due to noises

Remedy

Use SIM 16 to cancel the 
U2 trouble.

Note 

Case 3

Trouble 
position/
Cause

Scanner PWB EEPROM 
access circuit trouble

Remedy

Replace the scanner 
PWB.

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

EEPROM read/write error 
(PCU)
EEPROM communication 
trouble (NACK detection) 
Retry 3 times

Section

Engine

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

PCU PWB EEPROM 
access circuit trouble

Remedy

Replace the PCU PWB.

Note 

Main 
code

Sub 

code

Title