
B–63835EN/03
2. HARDWARE
189
WARNING
Only those personnel who have received approved safety
and maintenance training may perform this replacement
work.
When opening the cabinet and replacing a card PCB, be
careful not to touch the high–voltage circuits (marked and
fitted with an insulating cover). Touching the uncovered
high–voltage circuits presents an extremely dangerous
electric shock hazard.
CAUTION
1 Before starting replacement work, back up the contents
(such as parameters and programs) of the SRAM memory
of the CNC. Otherwise, the contents of the SRAM memory
may be lost during replacement work.
2 If the SRMA data check method (parity check or ECC check)
has been changed after the replacement, a parity or ECC
alarm may occur at power–on, possibly causing damage to
the SRAM data. Back up the SRAM data before starting
replacement, and restore the data after completing the
replacement.
2.7
MOUNTING AND
DEMOUNTING CARD
PCBS