Park Air Systems Limited B63300HS User Manual
T6T 300 Watt VHF Transmitter
Page 114
Maintenance
Removing and Refitting the Front Panel PCB
The Front Panel PCB is located as shown in Fig 42. Removing this assembly necessitates the removal
of both Power Supply modules and partial removal of the Combiner BIT module.
The Front Panel PCB is located as shown in Fig 42. Removing this assembly necessitates the removal
of both Power Supply modules and partial removal of the Combiner BIT module.
Dangerous voltage is present within the T6T VHF amplifier. Care must be taken by personnel
to avoid accidental contact with exposed circuitry when the covers are removed and power
is applied to the radio.
to avoid accidental contact with exposed circuitry when the covers are removed and power
is applied to the radio.
Removal
Before attempting to remove the Front Panel PCB, ensure that the 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:
dc input supplies. Disconnect the drive assembly cables at CN5 and CN8. Disconnect the antenna cable
to the Combiner. Then proceed as follows:
(1)
Remove the amplifier top and bottom covers as described on
.
(2)
Disconnect CN7 (10-way ribbon cable) at the Interface module. Carefully push the cable through
the aperture to the other side of the chassis.
the aperture to the other side of the chassis.
(3)
Refer to the instructions for removal of the Combiner BIT module, but do not remove any
connectors. The Power Supply modules must be removed and the Combiner BIT module’s
securing screws must be removed so that it can be lifted slightly away from the chassis. This
permits the ribbon cable to pass under the Combiner BIT module.
connectors. The Power Supply modules must be removed and the Combiner BIT module’s
securing screws must be removed so that it can be lifted slightly away from the chassis. This
permits the ribbon cable to pass under the Combiner BIT module.
(4)
Remove the two handles from the front panel by removing the four M5 x 20 mm panhead screws.
(5)
Remove the four countersunk M3 x 6 mm screws that hold the front panel to the chassis. The
front panel can now be moved away from the mainframe while guiding the ribbon cable from
within.
front panel can now be moved away from the mainframe while guiding the ribbon cable from
within.
(6)
Remove the Front Panel PCB from the Front Panel assembly by removing the four M3 x 6 mm
panhead screws and wavy washers.
panhead screws and wavy washers.
Refitting
To refit the Front Panel PCB, proceed as follows:
(1)
Place the PCB in position on the front panel. Secure the PCB to the Front Panel assembly using
the four M3 x 6 mm panhead screws and wavy washers previously removed.
the four M3 x 6 mm panhead screws and wavy washers previously removed.
(2)
Feed the ribbon cable through its respective hole at the front of the chassis.
(3)
Secure the Front Panel assembly to the top and bottom of the chassis using the four M3 x 6 mm
countersunk screws. Fit the two equipment handles using the four M5 x 20 mm panhead screws
previously removed.
countersunk screws. Fit the two equipment handles using the four M5 x 20 mm panhead screws
previously removed.
(4)
Route the ribbon cable under the Combiner BIT module, through the aperture to the Interface
module and connect it to CN7.
module and connect it to CN7.
(5)
Connect the drive assembly cables at CN5 and CN8. Connect the antenna cable to the
Combiner.
Combiner.
(6)
Re-establish the ac and/or dc supplies.
(7)
Switch power on at the radio using the rear mounted Supply switch.
(8)
Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(9)
Carry out a BIT interruptive test as detailed in the procedure
WARNING
Dangerous Voltage