User's Guide

Page 18
Back to Transceiver
Main Page
Removing and Refitting the PA Module
The PA module is located as shown in Fig 3. A module removal diagram is shown in Fig 8.
Removal
Before attempting to remove the PA module, 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) Remove CN3 from the PSU Regulator module.
(3) With the transceiver upside-down disconnect CN2 from the PA Control/Rx RF module.
(4) Disconnect the SMB connectors CN8 and CN10. Note that CN10 is located within the heatsink
fins and should be disconnected using long nosed pliers. Do not attempt to remove the connector
by pulling on the cable.
(5) Remove the black equipment handle from the PA side of the radio by unscrewing and removing
the two M5 x 16 mm panhead screws that secures it to the transceiver.
(6) Remove the six M3 x 8 mm countersunk screws and two M3 x 8 mm captive screws that secure
the PA from the bottom and top of the mainframe as shown in Fig 8. Ensure the PA module is
well supported during this operation.
(7) Withdraw the PA module from the mainframe taking care not to snag the wiring looms.
Refitting
Note ...
Take note of Repairs caution (2) on page 5 before fitting the PA module.
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 transceiver’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 transceiver upside-down connect CN2 to the PA Control/Rx RF module.
(6) Fit CN3 to the PSU Regulator module.
(7) Re-establish the ac and/or dc supplies (take heed of the warnings on page 10 and page 14).
(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 Transceiver on page 26.
(11) Carry out a BIT interruptive test as detailed in the procedure ‘To Initiate a BIT Test on page 7’.
(12) Remove the VFP PC to radio interconnection lead and 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.