User's Manual Part 3
Compact BTS Input and Output Board – continued
MAY 2004 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU 9-47
PRELIMINARY
Table 9-26: Procedure to Remove CBIO Board
Step Action
n WARNING
By pulling out the circuit breaker, power to the BTS will be interrupted, causing the BTS to go off
line.
3 Disengage DC power to the BTS by pulling out the 20 A breaker at the rear of the BTS.
4 If possible, turn off DC power at the source. Verify that DC power source is OFF.
5 Disconnect all cabling to the BTS.
6 Put on the ESD wrist strap.
7 At the rear of the BTS, remove the four M4 screws securing the SDCX or SDCX cover plate to the
CBIO Board. Gently remove SDCX module from the CBIO connector or SDCX cover plate.
8 Use a driver with a T20 star bit to remove 6 M4 screws securing CBIO to housing. See Figure 9-17.
* IMPORTANT
DO NOT yank out the CBIO Board, there are cables connected at the bottom rear side of the board.
9 Grasp holes and gently pull on CBIO Board to disengage it from the backplane. See Figure 9-17.
Note that there are internal cables connected at the bottom.
10 If not already done, label internal cables before disconnecting them.
11 Remove CBIO Board and place in an anti–static container.
Install CBIO Board
Follow the procedure in Table 9-27 toinstall the CBIO Board.
Table 9-27: Procedure to Install CBIO Board
Step Action
1 Put on the ESD wrist strap.
2 If not already done, remove CBIO Board from its anti–static container.
3 Set CBIO Board onto rear of BTS and connect the internal cables, in the same order as previously
connected.
4 Carefully align the CBIO panel to the frame and gently seat the CBIO connector into the backplane
connector.
5 Once aligned, with one hand grasp BTS and with the other hand gently push the CBIO until it sets up
against the housing.
6 Use a driver with a T20 star bit to secure the CBIO to the frame using 6 M4 screws. Torque screws to
2.3 N–M (20 in–lbs). See Figure 9-17.
7 Install SDCX or SDCX cover plate and secure to CBIO using 4 M4 screws. Torque screws to 2.3
N–M (20 in–lbs).
table continued on next page
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