AR-M550 (serv.man16). (9) Self diag message and troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 36

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

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

Check sum error for every 
individual data in SRAM 
of the MFPC section 
when turning on the 
power
(If this error occurs, 
initialize the data related 
to the check sum error. 
(Communication 
management table, 
sender’s information, etc.)

Section

Controller

Operation 
mode
Note 

Case 1

Trouble 
position/
Cause

SRAM trouble

Remedy

Automatically initialize the 
data related to the check 
sum error by turning OFF/
ON the power.
Since the registered data 
are deleted, register the 
data again.

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

MFP control PWB 
EEPROM access circuit 
trouble

Remedy

Replace the MFP control 
PWB.

Note 

Main 
code

Sub 

code

Title

Phenomenon

Display

Lamp

Message

Details

Check sum error for 
every individual data in 
HDD of the MFPC section 
when turning on the 
power
(If this error occurs, 
initialize the data related 
to the check sum error. 
(One-touch, group, 
program, etc.)

Section

Controller

Operation 
mode

Note 

Case 1

Trouble 
position/
Cause

HDD write/read error

Remedy

Automatically initialize the 
data related to the check 
sum error by turning OFF/
ON the power.
Since the registered data 
are deleted, register the 
data again.

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

MFP control PWB HDD 
access circuit trouble

Remedy

Replace the HDD.
Replace the MFP control 
PWB.

Note