Product Info

Modem Boards Chapter 8: DMI R eplacement Procedures
Procedure 8 -4 R eplacing a Modem Board (Continued)
5
F or an affected DMI that is the Site Master , go to step 6
F or an affected DMI that is not the Site Master , go to step 7 .
6
Reset the affected DMI Site Master and force the other DMI to become
the Site Master by entering the following command at the prompt:
omc-000000> RESET DMI-<bts#>-<dmi#>- UNC
7
Lock the affected DMI by entering the following command at the prompt:
omc-000000> LOCK DMI-<bts#>-<dmi#>- UNC
A T THE BTS SITE
8
Based on the affected DMI EID information, determine the type (i.e., 1X CDMA or EV -DO) of
failed modem board in the affected DMI.
9
Obtain the needed replacement modem board and keep it in an ESD container . Also obtain
an ESD container to put the DMI assembly in.
10
P ower down the affected DMI by setting the corresponding PDU DMI 20A circuit breaker to
the off position (pulled out).
Mak e sure the PDU DMI circuit break er is set to OFF .
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.
1 1
ESD handling precautions must be adhered to during this procedure. W ear a
conductiv e, high impedance wrist str ap .
Plug the end of the ESD wrist strap into the UBS Macro BTS frame ESD jack This jack is
located in the middle of the upper XMI shelf bracket. A ttach the wrist strap to your wrist.
12
Disconnect all of the cables connected to the affected DMI front panel connectors.
13
Turn the retaining fastener , located in the upper right corner of the affected DMI front
panel, CCW (Counter Clockwise) until resistance is felt. This indicates that the retaining
fastener is disengaged.
14
Grasp the affected DMI by the handle with one hand and pull outward. While supporting the
bottom of the DMI assembly with the other hand, slide the DMI assembly completely out
of its housing.
Continued
8 -24 68P09283A64 -3
FOA SEP 2007