Park Air Systems T6TR, User Documentation

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T6TR VHF 50 W Transceiver Page 20 Maintenance
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Removing and Refitting the Front Panel Assembly PCB
The Front Panel assembly PCB is located as shown in Fig 8 . An assembly and PCB removal diagram is
shown in Fig 14 .
Removal
Before attempting to remove the Front Panel assembly PCB, ensure that the transceiver is isolated from
the ac and dc input supplies. Then proceed as follows:
Dangerous voltages are present within the transceiver. Care must be taken by personnel to
avoid accidental contact with exposed circuitry when the bottom cover is removed and
power is applied to the radio.
(1) Remove the transceiver’s top and bottom covers as described on page 9 and page 13 .
(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/Rx RF module.
(4) Remove the four M3 x 8 mm countersunk screws from the bottom and top of the mainframe box
section (see
Fig 14 , 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 transceiver. 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.
(7) Disconnect the speaker connector from the Front Panel PCB.
(8) Remove the Front Panel PCB from the Front Panel assembly by removing the six M3 x 6 mm
panhead screws and wavy washers (see
Fig 14 Diagram B).
Refitting
To refit the Front Panel assembly PCB, proceed as follows:
(1) Place the PCB in position at the Front Panel assembly. Ensure the spindle of the control knob
and Headset/Microphone/Diagnostics connector are correctly located.
(2) Secure the PCB to the Front Panel assembly using the six M3 x 6 mm panhead screws and wavy
washers previously removed (see
Fig 14 , Diagram B).
(3) Connect the speaker connector to the Front Panel PCB.
(4) At the front panel, place the control knob onto the spindle and using a 1.5 mm Allen key, secure
the Allen head grub screw.
(5) Secure the Front Panel assembly to the top and bottom of the mainframe box section using the
four M3 x 8 mm countersunk screws previously removed. Fit the two black equipment handles
using the four M5 x 16 mm panhead screws (see
Fig 14 , Diagram A).
(6) Route the ribbon cable to the Processor module connector CN4 and connect it.
(7) Route the SMB connector to CN5 on the PA Control/Rx RF module and connect it.
WARNING Dangerous Voltages