Park Air Systems Limited B63300HS User Manual

T6T 300 Watt VHF Transmitter

Page 115

Maintenance

(10) Set the rear panel Supply switch to Standby. Isolate the amplifier from the ac and/or dc supplies.

(11) Refit the amplifier top and bottom covers. The amplifier can now be returned to service.

Removing and Refitting the Cooling Fans
The cooling fans are mounted at the rear of the PA modules as shown in 

. The removal diagram

is shown in 

.

Before attempting to remove the fan, ensure that the T6T VHF amplifier is isolated from the ac and dc
input supplies. Disconnect the drive assembly cables at CN5 and CN8. Disconnect the antenna cable to
the Combiner. Then proceed as follows:

(1)

Disconnect the two-pin connector.

(2)

Remove the fan finger guard.

(3)

Using an Allen key inserted through the holes exposed when the finger guard is removed,
remove the three M4 x 12 mm caphead Allen screws that secure the fan to the PA module
heatsink.

(4)

Remove the fan from the PA module.

To refit a cooling fan, proceed as follows:

(1)

Locate the fan in position and using a suitable Allen key inserted through the holes for the fan
finger guard, secure using the three M4 x 12 mm caphead Allen screws previously removed.

(2)

Secure the finger guard to the fan.

(3)

Connect the two-pin fan connector to the fan. Ensure the + marked socket mates with the +
marked plug on the fan.

(4)

Connect the drive assembly cables at CN5 and CN8. Connect the antenna cable to the
Combiner.

(5)

Re-establish the ac and/or dc supplies.

(6)

Switch power on at the radio using the rear mounted Supply switch.

(7)

Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit. The amplifier can now
be returned to service.