
2. LCD--MOUNTED TYPE i SERIES HARDWARE
B--63005EN/02
264
WARNING
Only those personnel who have received approved safety
and main tenance training may perform this replacement
work.
When opening the cabinet and replacing the board, 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
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.
CAUTION
If the SRAM data check method (parity or ECC check) to be
used after the motherboard is replaced differs from the one
used before replacement, a parity alarm or ECC alarm will
occur when the power is switched on, possibly leading to
loss of the SRAM memory contents. To avoid this problem,
make a backup copy of the SRAM memory before replacing
the motherboard, and restore the SRAM memory contents
using the backup copy after motherboard replacement.
2.6
REPLACING THE
MOTHERBOARD