Справочник Пользователя для Park Air Systems Limited B63300HS
T6T 300 Watt VHF Transmitter
Page 111
Maintenance
❑
CN14 6-way connector
❑
CN15 10-way connector
❑
CN16 SMB connector
❑
CN17 SMB connector
❑
CN18 SMB connector
❑
CN22 QMA connector
❑
CN23 QMA connector
❑
CN24 QMA connector
❑
CN25 SMB connector
❑
CN26 SMB connector
❑
CN27 SMB connector.
(3)
The Combiner BIT module is secured from both sides of the chassis thus requiring removal of
the Power Supply modules. Refer to
the Power Supply modules. Refer to
and remove both Power Supply modules.
(4)
Removal of the Power Supply modules will expose the six M3 x 6 mm countersunk screws that
secure the Combiner BIT module heatsink to the chassis. Remove these six screws.
secure the Combiner BIT module heatsink to the chassis. Remove these six screws.
(5)
Remove the six M3 nuts that secure the Combiner BIT module PCB to the stud spacers. Also
remove the two M3 x 8 mm panhead screws that secure the Combiner BIT module heatsink to
the lower PA heatsink. The Combiner BIT module can now be removed.
remove the two M3 x 8 mm panhead screws that secure the Combiner BIT module heatsink to
the lower PA heatsink. The Combiner BIT module can now be removed.
Refitting
To refit the Combinere BIT module, proceed as follows:
(1)
Place the Combiner BIT module in place on the stud spacers and replace the six washers and
nuts, previously removed, but do not tighten. Take care that cables are dressed properly and that
none are trapped. Replace the two screws previously removed that secure the Combiner BIT
module to the PA heatsink, but do not tighten.
nuts, previously removed, but do not tighten. Take care that cables are dressed properly and that
none are trapped. Replace the two screws previously removed that secure the Combiner BIT
module to the PA heatsink, but do not tighten.
(2)
Turn the unit over and replace the six countersunk M3 x 6 mm screws previously removed.
Tighten these and return to the other side to tighten the six nuts and two screws.
Tighten these and return to the other side to tighten the six nuts and two screws.
(3)
All 22 connectors removed earlier can now be reconnected.
(4)
Connect the drive assembly cables at CN5 and CN8. Connect the antenna cable to the
Combiner.
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.
(8)
Carry out the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure
(9)
Carry out a BIT interruptive test as detailed in the procedure
(10) Set the rear panel Supply switch to Standby and remove the VFP connector. Isolate the
transmitter from the ac and/or dc supplies.
(11) Refit the amplifier top and bottom covers. The amplifier can now be returned to service.