Installation Instructions

1X UBS Macro B T S FRU DMI (Digital Module Internal) Assembly

Procedure 8 -1 Preparing the replacement DMI assembly in the Field

A T THE OMCR

Ask the OMCR operator to get the EID information for the

failed DMI by entering the following command at the prompt:

omc-000000> DISPLAY BTS-<bts#>- EID

Observe the displayed response. Record the model number of

the failed DMI and its modem board quantity and model numbers. Modem boards are

designated as HDMODEM. Check values for both HDMODEM numbers (i.e., 1, 2 for

DMI 1 and 21, 22 for DMI 2) on the affected DMI. If an HDMODEM number has a

blank value, then it does not exist.

IN THE DMI PREP ARA TION AREA

Based on the failed DMI EID information, determine the quantity and type of modem boards

needed to match that of the failed DMI.

Obtain the needed replacement units.

ESD handling precautions must be adhered to when handling and working on

the DMI assembly or the modem boards. W ear a conductiv e, high impedance

wrist str ap during handling. All work performed on the DMI assembly and modem

boards must be done in an ESD protected work area.

Remove the DMI assembly , without modems, from its shipping packaging. Set the DMI

assembly handle side up (see Figure 8-1 Removing and installing Modem 1 on page 8- 13 )

onto a clean, ESD protected surface. Retain the packaging for later reuse.

Remove the modem board(s) from its shipping packaging. Retain the packaging for later

reuse.

Install Modem 1 into the DMI assembly by performing the following:

1. Carefully place the front edge of Modem 1 under the lip of the DMI front panel.

2. Align the modem-to-controller connector halves so that they will mate together . In

order to ensure proper connector alignment prior to connector insertion, verify that

the modem screws are aligned with chassis mounted standoffs and that screws are

not at an angle.

3. Press down ﬁrmly on the black plastic modem connector handle until the connector

halves are fully seated. Approximately 70 N (15 lbs) of force is required to fully seat the

connector halves.

4. Using a T20 TORX bit and torque driver , tighten the seven captive screws that retain

Modem 1 to the replacement DMI assembly . Tighten the screws to 1.6 - 1.8 N-m (14 -

16 in-lb).

5. A fter tightening the screws, ﬁrmly squeeze the modem connectors together to make

sure that it is well seated. This may help prevent problems/errors that may not be

visible from the OMCR.

Continued

68P09283A64 -3 8 -11

FOA SEP 2007