T6T VHF 100 W Transmitter
Page 21
Maintenance
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(6)
Route the coaxial cable SMB connector to CN5 on the PA Control module and connect it.
(7)
Re-establish the ac and/or dc supplies.
(8)
Switch power on at the radio using the rear mounted Power switch.
(9)
Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(10) Carry out a BIT interruptive test as detailed in the procedure
To Initiate a BIT Test on page 5
.
(11) Set the rear panel Power switch to Standby. Isolate the transmitter from the ac and/or dc
supplies.
(12) Refit the transmitter top and bottom covers. The transmitter 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
Fig 5
. The removal diagram is
shown in
Fig 15
.
Dangerous voltages are present within the transmitter. 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.
Removal
Before attempting to remove the fan, ensure that the transmitter is isolated from the ac and dc input
supplies. 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.
Refitting
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)
Re-establish the ac and/or dc supplies.
(5)
Switch power on at the radio using the rear mounted Power switch.
(6)
Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit. The transmitter can
now be returned to service.
WARNING
Dangerous Voltages
Summary of Contents for T6T
Page 1: ...T6T VHF 100 W Transmitter User Documentation ...
Page 10: ...Back to Transmitter Main Page Intentionally Blank ...
Page 54: ...Back to Transmitter Main Page Intentionally Blank ...
Page 115: ...Back to Transmitter Main Page Fig 13 PA Modules Removal and Refitting Detail PA 1 PA 2 ...
Page 118: ...Back to Transmitter Main Page Intentionally Blank ...