AR-M550 (serv.man17). (10) ROM version-up method - Sharp Copying Equipment Service Manual (repair manual). Page 5

AR-M550/M620  ROM VERSION-UP METHOD  10 - 5

If the power is turned OFF during the version-up procedure, normal
writing of data cannot be assured even though the machine can be
booted again.

In such a case, use the spare PCU PWB ROM, the MFP control PWB
ROM (boot, program), and the scanner control PWB ROM each of
which includes the program to be operated, and perform the version-
up procedure again.

Replace with the spare PCU, the controller boot, the scanner control
PWB ROM, and perform procedure “4.” for the replaced ROM again to
write data into it.

Update completed

 

Setting mistake? (6.)

 

NO 

NO  

YES 

 

YES

YES

 

YES

NO

 

NO

 

Set again.

Write the on-board 
files collectively. (4.)

NG is BOOT?

NG is SCAN FAX?

Result: OK?

YES

 

NO

YES

NO

YES

NO

Remove the BOOT Flash ROM and 
replace it with a spare one. (If there is 
any NG Flash ROM, replace it, too.)

Booted normally?

Write the on-board files 

collectively. (4.)

Result: OK?

Result: OK?

Update completed

Update completed

Write with an empty 

socket. (5.)

If the Flash ROM itself is 
defective, replace it with a 
new one and try again.