User Manual

1X UBS Macro B T S FRU Unbalanced E1 Daughter Card
E1 daughter card replacement procedure
This procedure requires working on or around circuitry which is extremely sensitiv e
to ESD . W ear a conductiv e, high impedance wrist str ap during the procedure. Use
appropriate safet y measures.
T o replace the E1 daughter card perform the steps in Procedure 6 -3 .
Procedure 6 -3 R eplacing the E1 daughter card
A T THE OMCR
1
Shut down site signaling functions according to Procedure 3-2 Shutdown site signaling
functions procedure for a packet BTS on page 3- 5 .
A T THE BTS SITE
Y ou will be disconnecting multiple cables from connectors. If necessary , use
masking tape and a marker and temporarily tag each cable as to the proper
connector before disconnection.
2
Disconnect all of the cables connected to the E1 daughter card front panel connectors.
3
Use a T20 TORX bit/driver to completely loosen and remove the four corner screws that
secure the E1 daughter card to the S SI front panel.
4
Grasp the E1 daughter card.
Pull the E1 daughter card away from the S SI until the 37–pin connectors disengage.
Remove the E1 daughter card.
5
P osition the replacement E1 daughter card so that the 37–pin connector on the
bottom of the card can connect to the SP AN 37–pin connector on the S SI front panel.
Push the E1 daughter card onto the S SI until the 37–pin connectors are fully engage.
6
Insert the four corner screws that secure the E1 daughter card to the S SI front panel.
7
Using a T20 TORX bit and torque driver , tighten the four corner screws to 2.37 N-m (21 in-lb).
8
Reconnect all of the cables to the corresponding connectors on the E1 daughter card front
panel.
Continued
68P09283A64 -3 6 -11
FOA SEP 2007