
B--63005EN/02
9.TROUBLESHOOTING
665
A bus error occurred on the local bus on the motherboard (main CPU
board).
This alarm indicates that an error occurred during the exchange of data
within the motherboard (main CPU board).
Replace the CPU card on the motherboard (main CPU board).
Replace the display control card, axis control cards, DRAM module,
FROM module, and SRAM module, one at a time.
Replace the motherboard (main CPU board).
If alarm 972 is issued, indicating on the screen that a local BUS error
occurred on an option board, replace the CPU card on the option card,
DRAM module, axis control cards, and option card, one at a time.
Some option boards have a circuit equivalent to the CPU card installed
on the boards themselves. See the hardware chapter for details.
Screen display example
SYSTEM ALARM
972 NMI O CCURRED IN OTHER MODULE
SLOT 01
976 L-BUS ERROR <SUB
9.37
ALARM 976
(LOCAL BUS ERROR)
Causes and actions
D Replacing the CPU card
D Replacing other cards
and modules
D Replacing the
motherboard (main CPU
board)
D Local BUS error on an
option board