User's Manual

EX7100 Technical Manual - Module Descriptions
©1999 Exicom Technologies (1996) Ltd 7-32 Issue 3 - May 2001
7.6.3 Alignment
There are no user adjustments available on the RF Power Amplifier module. Specialist
factory test equipment and procedures are required to correctly set up the amplifier.
Module Re-tuning
The RF Power Amplifier module is a broad band device and does not require adjustment.
7.6.4 UHF RF Power Amplifier Replacement Procedure
This procedure covers the replacement of the RF Power Amplifier Module.
Note: Under NO
circumstances must the terminal be connected to DC supply without the
Antenna port being terminated. Powering up of the PA without a load will result in
the PA being damaged.
1. Isolate the EX7100 Terminal from the incoming DC Supply by removing the DC input
wires from the rear panel terminal block.
2. Remove the bottom cover of the terminal as per Section 6.1.
3. Remove the six screws securing the cooling fan box assembly (see Figure 7.19) to
the PA heatsink to reveal the heatsink securing screws.
4. Ease the Fan Box away from the PA Heatsink, disconnect Fan control wires from the
terminal block, and then remove the Fan Box. Note the position of wires and the way
that the wires are run.
5. Remove the seven cap screws holding the heat sink casting to the main casting as
per Figure 7.20.
6. Carefully ease the heat sink away from the terminal making sure not to damage the
connecting cables. Note the connector positions and the way that the cables are run
(it is important that all cables are replaced as they were initially run before the
module replacement procedure)
7. Remove the RF cable PL102 from the PA PCB, also remove the mating
end of the
following connections: J101 (to “Tx RF out”, transmitter PCB), PL103 (to RF CPU
PCB) and PL104 (to white 4-way connector, transmitter PCB).
8. Carefully reconnect the above cables to the new Power Amplifier and position the
new module inside the EX7100 terminal casting. Refit the seven cap screws holding
the heat sink casting into the main casting. (Refer to Figure 7.20)
9. Reconnect the Fan control wires as noted in 4. above and position the Fan Box over
the PA Heatsink. Refit the six screws securing the Fan Box to the PA Heatsink
(Refer to Figure 7.19).
10. Inspect the EX7100 terminal to ensure that it is free of foreign material. Remove and
clean as required.
11. Refit the bottom cover of the terminal as per Section 6.1.
12. Connect the antenna to the terminal. Apply power to the EX7100 rear panel and
switch the terminal on.