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DMI (Digital Module Internal) Assembly Chapter 8: DMI R eplacement Procedures
The DMI assembly is the FRU (i.e., spare) that is used for DMI replacement. This assembly
includes a chassis with a controller board, fans, front panel and two modem boards. This
assembly does not include an outer housing. The DMI outer housing in the UBS Macro BTS
frame is reused.
The DMI FRU that is used for DMI replacement can be either of the following:
• F actory built DMI assembly – consisting of a DMI chassis, controller board, fans, front
panel and two modem boards (i.e., 1X CDMA, EV -DO , or a combination of both).
• Field prepared DMI assembly – consisting of a DMI chassis, controller board, fans, front
panel and up to two modem boards (i.e., 1X CDMA, EV -DO , or a combination of both)
that are added to the assembly in the field.
This chapter provides a procedure describing how to field prepare a DMI assembly , by
installing up to two modems, so that it matches the configuration of the failed DMI.
The DMI assemblies do not include an outer housing. The DMI outer housing in the UBS Macro
BTS frame is reused.
The typical DMI replacement scenario is as follows:
1. Remove the failed DMI assembly from its outer housing in the UBS Macro BTS frame.
2. Remove the replacement DMI assembly from its packaging and install it into the outer
housing in the UBS Macro BTS frame.
3. Place the failed DMI assembly into the packaging that the replacement DMI came in.
The DMI assembly FRU is used as a replacement for a DMI with an internal DMI
component failure (including controller board, modem board, fan, or front panel
failure). Although, a DMI with a modem board failure can just have the failed modem
board replaced. This is covered in the Modem Board section of this chapter .
This chapter also provides a procedure describing how to dismantle a failed DMI
assembly in the field. This procedure is used if it is desired to reclaim known good
FRUs from the failed DMI assembly . A fter dismantling the DMI assembly , the failed
portion may be returned to Motorola for repair and the reclaimed known good FRUs
may be restocked.
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FOA SEP 2007