User's Guide

T6T 50 W VHF Transmitter Page 15 Maintenance
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Refitting
To refit the PA module, proceed as follows:
(1) Place the module in position and butt it up to the mainframe. Ensure no wires are trapped by the
module.
(2) Fit the six M3 x 8 countersunk screws and two M3 x 8 mm captive screws that secure the module
to the transmitter’s mainframe.
(3) Fit the black equipment handle to the PA side of the radio using the two M5 x 16 mm panhead
screws.
(4) Connect the SMB connectors CN8 and CN10. Note that CN10 is located within the heatsink fins
and should be connected using long nosed pliers if unable to use fingers in the enclosed space.
(5) With the transmitter upside-down connect CN2 to the PA Control module.
(6) Fit CN3 to the PSU Regulator module.
(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 the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure
To Calibrate the Transmitter on page 22.
(11) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.
(12) Remove the VFP connector and switch power off at the transmitter using the rear mounted
Power switch. Isolate the transmitter from the ac and/or dc supplies.
(13) Refit the transmitter’s top and bottom covers. The transmitter can now be returned to service.
Removing and Refitting the Front Panel Assembly PCB
The Front Panel assembly is located as shown in Fig 3. An assembly and PCB removal diagram is shown
in Fig 9.
Removal
Before attempting to remove the Front Panel assembly PCB, ensure that the transmitter is isolated from
the ac and dc input supplies. Then proceed as follows:
(1) Remove the transmitter’s top and bottom covers as described on page 9 and page 12 (take heed
of the warnings on those pages).
(2) Disconnect CN4 at the Processor module. Carefully pull the cable through the aperture in the
mainframe to free it.
(3) Disconnect SMB connector CN5 at the PA Control module.
(4) Remove the four M3 x 8 mm countersunk screws from the bottom and top of the mainframe box
section (see Fig 9, Diagram A).
(5) Remove the two black equipment handles by unscrewing and removing the four M5 x 16 mm
panhead screws that secure them to the transmitter. The front panel can now be moved forward
and away from the mainframe.
(6) At the front panel, release the control knob by unscrewing the Allen head grub screw using a
1.5 mm Allen key. Withdraw the control knob from the spindle.