Replacing The Mts 4 Preselector; Figure 152: Schematic Diagram Of Mts 4 Preselector - Motorola MTS LiTE Installation, Configuration And Basic Service Manual

6802800U74-AN
Chapter 7: Radio Frequency Distribution System

Figure 152: Schematic Diagram of MTS 4 Preselector

Antenna
7.3.2.1

Replacing the MTS 4 Preselector

WARNING: RF energy burn hazard. Disconnect power in the cabinet to prevent injury and
equipment damage while disconnecting and connecting antennas.
Process:
1 Remove the Preselector.
See Removing the MTS 4 Preselector on page
2 Reinstall the Preselector.
See Reinstalling the MTS 4 Preselector on page
7.3.2.1.1
Removing the MTS 4 Preselector
Procedure:
1 Remove the door of the cabinet completely.
2 Remove the four screws holding the front panel.
3 Loosen the two screws holding the front section of the top panel and slide off the panel.
4 Loosen the screws fastening the rear section of the top panel and slide off the panel.
5 Unscrew the antenna cable and remove the RX cables connected to the back of the Preselector.
6 Loosen the two fastening screws at the front enough to free the mounting bracket.
7 Slide the Preselector out of the cabinet.
8 Remove the Preselector from the bracket and replace with the new unit.
276
7V DC supply
Preselector
LNA
DC
DC
DC
DC
RX
DC
276.
277.
RX BR1
BR2
RX
RX BR3
BR4
RX
RX
Exp.
Cabinet