User's Guide

Page 19
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Removing and Refitting the Front Panel Assembly PCB
The Front Panel assembly PCB 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 transceiver is isolated from
the ac and dc input supplies. Then proceed as follows:
(1) Remove the transceiver’s top and bottom covers as described on page 10 and page 14 (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/RxRF 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 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 9 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 Heaset/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 (see Fig 9, 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. Fit the two black equipment handles using the four
M5 x 16 mm panhead screws (see Fig 9, 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/RxRF module and connect it.
(8) Re-establish the ac and/or dc supplies (take heed of the warnings on page 10 and page 14).
(9) Switch power on at the radio using the rear mounted Power switch.
(10) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(11) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 7.
(12) Switch power off at the transceiver using the rear mounted Power switch. Isolate the transceiver
from the ac and/or dc supplies
(13) Refit the transceiver’s top and bottom covers (take note of repairs caution (1) on page 5 before
carrying out this task). The transceiver can now be returned to service.