Installation Instructions

DMI (Digital Module Internal) Assembly Chapter 8: DMI R eplacement Procedures

Procedure 8 -1 Preparing the replacement DMI assembly in the Field (Continued)

If the failed DMI assembly to be replace is equipped with Modem 2, go to step 8 otherwise

go to step 11 .

P osition the DMI assembly on its side with the front panel handle at the bottom (see

Figure 8-2 Removing and installing Modem 2 on page 8- 14 ).

Remove the modem board from its shipping packaging. Retain the packaging for later reuse.

Install Modem 2 from the failed DMI assembly into the replacement DMI assembly by

performing the following:

1. Carefully place the Modem 2 in the rear half of the DMI assembly .

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 2 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.

1 1

Place the ﬁeld prepared DMI assembly , with modems, into the original packaging that the

DMI assembly was received in.

T o speed up code and data synchronization when this replacement DMI is placed

into the BTS (especially if it is the only DMI in the BTS), it is recommended to set

up a staging area for upgrading the code and base ﬁle for this replacement DMI to

the same version that is used at the site. A fterwards, the DMI may be packaged

and taken to the site.

T ake the ﬁeld prepared DMI assembly , in it’s packaging, to the BTS site having the failed

DMI. P erform Procedure 8-2 Replacing the DMI on page 8- 15 .

Reference Diagrams

The following diagrams are used to aid the DMI replacement procedures.

8 -12 68P09283A64 -3

FOA SEP 2007