Huawei Airbridge cBTS3612 Maintenance Manual page 67

On-site Maintenance Manual
Airbridge cBTS3612 CDMA Base Station
The power supply to all the boards in the baseband subrack is
controlled by the baseband subrack switch. There are two cases for
replacing the boards of baseband subrack:
Power off the baseband subrack to replace the BCIM or
l
BCKM (when the BTS has only one BCKM equipped).
Leave the baseband subrack power on, and replace the
l
BRDM, BCPM and BCKM (when the BTS has two BCKMs
equipped - for active/standby purpose).
Sector carrier blocking:
5)
When replacing the boards of the baseband subrack, we will
have to block those sector carriers that would be affected during the
replacement process. We can unblock them after the replacement is
finished.
If we operate directly on the BTRM power switch, the
block/unblock operation can then be skipped.
6) Common tools:
A crosshead screwdriver for driving M3 screws is needed when
replacing the boards or modules.
Board Removing
II.
1) Loosen and remove the screws on the board panel
counter-clockwise.
2) Hold the board upper and lower handles with both hands,
pull outwards and rotate 45 degrees. The board will then be
detached from the backplane.
3) Pull out the board along the slot and put it into the
anti-static bag and keep it in the packing box (DO NOT
Chapter 4 Component
4-2
Replacement