
B–63785EN/01
2. 15i SERIES HARDWARE
177
WARNING
Only those personnel who have received approved safety
and maintenance training may perform this replacement
work.
Before opening the cabinet to replace the board, ensure
that both the power to the CNC and the main power to the
power magnetics cabinet are turned off. If only the CNC
power is turned off, the servo unit may still be powered
during the board replacement work, possibly causing
damage to the board and peripheral units, as well as
presenting the risk of electric shock to the user.
CAUTION
When replacing the printed circuit board, note the
following:
(a) Be careful not to touch the semiconductor devices and
other parts on the board.
(b) Before demounting the power supply unit or main board
(together with the mounted cards and modules), back up
the data (such as parameters and programs) in the SRAM
memory of the CNC to storage media, including memory
cards and floppy disks. Otherwise, the SRAM memory
data may be lost during the replacement work.
(c) Reconnect any cables disconnected during the
replacement work. If there is a chance of forgetting how
the cables are connected, make a note before
disconnecting them.
(1) Disconnect all the cables from the boards on the rack.
(2) Demount all the boards from the rack, as described in Section 2.5.
(3) Loosen the screws securing the top of the rack.
(4) Remove the screws securing the bottom of the rack. Slightly lift the
rack, then remove it together with the top screws.
(5) Detach the fan connectors from the back panel.
(6) While holding down the latches for the back panel with a tool such
as a flatblade screwdriver, slide the back panel down.
(7) Slide the back panel until it unhooks, then pull it towards you.
2.8
REPLACING THE
BACK PANEL
2.8.1
Demounting the Back
Panel