
B–63665EN/01
7. TROUBLESHOOTING
313
A ROM parity error occurred.
The software including the CNC system software, servo software, PMC
management software, and PMC Ladder is stored in the flash memory on
the FROM/SRAM module. It starts execution after being loaded into the
RAM of the DRAM module or servo card at power on.
A ROM parity error occurs if the software stored in the FROM/SRAM
module is destroyed.
On the screen, the series of the software in which a fault was detected is
displayed. Rewrite the software using the boot system.
The software stored in the FROM/SRAM module includes a variety of
FANUC software components, as well as those created by the MTB, such
as the PMC Ladder.
Replace the FROM/SRAM module
After replacement, all the software that was once stored must be written.
Because the replacement clears the contents of the SRAM memory, the
memory contents must be restored. For this operation, use the boot
system.
If any of the above actions does not solve the problem, replace the
motherboard.
[For the LCD–mounted type]
FROM/SRAM module
7.23
ALARM 900
(ROM PARITY)
Causes and actions
D Rewriting the software
component
D Replacing the
FROM/SRAM module
D Replacing the
motherboard
D Installation position of
the FROM/SRAM module