Park Air Systems Limited B63300HS User Manual
T6T 300 Watt VHF Transmitter
Page 106
Maintenance
T6T VHF Amplifier Procedures
Top and Bottom Covers
One of the top cover screws is covered with a warranty label that should not be tampered with unless
Park Air Customer Support has advised otherwise. When authorisation has been made the following
procedures should be followed.
One of the top cover screws is covered with a warranty label that should not be tampered with unless
Park Air Customer Support has advised otherwise. When authorisation has been made the following
procedures should be followed.
To remove the top cover, locate and unscrew the 19 countersunk screws securing the top cover to the
mainframe. Access can then be gained to the Interface module and PSU Regulation module.
mainframe. Access can then be gained to the Interface module and PSU Regulation module.
To remove the bottom cover, locate and unscrew the 15 countersunk screws securing the bottom cover
to the mainframe. Access can then be gained to the Combiner BIT module.
to the mainframe. Access can then be gained to the Combiner BIT module.
Removal and refitting of the following modules requires both top and bottom covers to be removed:
❑
Power Supply modules
❑
Combiner BIT module
❑
PA modules
❑
Front Panel assembly PCB.
Removing and Refitting the Interface Module
The Interface module is located as shown in
The Interface module is located as shown in
. A module removal diagram is shown in
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
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:
cables at CN5 and CN8. Disconnect the antenna cable to the Combiner. Then proceed as follows:
(1)
Unscrew the 19 countersunk screws and remove the amplifier top cover.
(2)
Locate the Interface module and disconnect the following connectors:
❑
CN2 10-way connector (10-way loom from Combiner BIT module CN15)
❑
CN3 SMB connector (coaxial cable from Combiner BIT module CN27)
❑
CN4 SMB connector (coaxial cable from Combiner BIT module CN16)
❑
CN6 15-way connector (15-way ribbon cable from PSU Regulation module CN1)
❑
CN7 10-way connector (10-way ribbon cable from Front Panel PCB).
(3)
Gain access to the rear of the amplifier. Using a 5 mm nut spinner tool, remove the four screwloc
8 mm-4-40 UNC stud spacers and wavy washers that secure the Interface module connectors
CN5 and CN8 to the rear panel.
8 mm-4-40 UNC stud spacers and wavy washers that secure the Interface module connectors
CN5 and CN8 to the rear panel.
(4)
Also at the rear of the amplifier, remove the two M3 x 8 mm screws that secure the blanking plate
and the Interface module.
and the Interface module.
(5)
Remove the five M3 x 8 mm screws that secure the module to the amplifier mainframe.
(6)
Remove the module from the chassis.
WARNING Dangerous Voltage