User's Manual

385700-1006-006 MAINTENANCE AND TROUBLESHOOTING
Document use is restricted to that described on cover 5-5
5.3 CORRECTIVE MAINTENANCE
This section describes the removal and replacement of the MDR and BDR assemblies. See
Section Radio Assembly Fault Isolation, to determine when to remove and replace a line
replaceable unit (LRU).
5.3.1 REMOVE AND REPLACE MDR
Referring to Figure 5-3, perform the following actions to remove the MDR (shown as Item 2)
1. Place MDR (2) power switch (3) to the OFF position.
2. Disconnect the control equipment data cable that attaches to the MDR’s
DATA
1
port (5),
DATA 2
port (7), and
DIAGNOSTIC
port (8) if installed.
3. Disconnect the DC power cable from POWER IN (4), the antenna feed line
from
ANTENNA
port (6).
4. Remove four bolts (1) from the MDR (2) mounting brackets.
5. Remove mobile data radio (2).
Referring to Figure 5-3, perform the following actions to replace the MDR:
1. Place MDR (2) in position.
2. Secure MDR (2) with four bolts (1).
3. Reconnect the antenna feed line to port (6).
4. Reconnect the control equipment data cable to attach the MDR (2).
5. Reconnect the DC power cable to the POWER IN (4). Place MDR (2) power
switch (3) to
ON
position.