Park Air Systems Limited BM7X User Manual

M7X and M7R

Page 5-32

Maintenance

Refitting the RF PA
To refit the RF PA into the radio:

(1)

After ensuring all surfaces are clean, fit a new thermal pad to the RF PA as shown in 

The thermal pad is naturally adhesive and is supplied with a protective film on both sides.
Partially remove the protective film from one end and carefully position the pad before removing
the film completely. As the film is being removed, ensure no air bubbles are trapped between the
PSU surface and the film.

(2)

After the protective film has been removed from both sides of the thermal pad, carefully place the
RF PA in position.

(3)

Using a Torx T15 screwdriver secure the RF PA using seven screws and associated wavy
washers as shown in 

.

(4)

Looking from the rear of the radio, identify the RF PA 3-way power connector as shown in

. Make the in-line connection.

(5)

Looking from the rear of the radio, identify the ribbon cable that connects from the RF PA module
to a chassis mounted connector as shown in 

 Connect the ribbon cable from the RF PA

to the chassis connector.

(6)

At the RF PA, connect the coaxial cables listed in 

(7)

Identify the RF PA cover, shown in 

. Refit the cover using the 26 securing screws (part

number 36T46330060).

(8)

Refit the Interface module as detailed on 

(9)

Refit the radio’s top cover as detailed on 

(10) Connect the radio to a PC using the Lemo to USB cable.

(11) Reapply input power to the radio.

(12) Refer to page page 47 and complete the procedure ‘Setting the Carrier Power Trim’

(13) Disconnect the Lemo to USB cable and restore the radio ready for operational use.