Elecraft XV Assembly Manual for XV432 MHz - Manual (Page 43)

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Slide the PCB under the leads on the RF power module and over the
screws until they pass through the holes in the PCB (see Figure 40). You
can rock the RF power module slightly on the screws and bend the leads
up as needed to slip the PCB under them and over the tops of the
mounting screws.
Place an internal-tooth lock washer and nut on each screw and tighten
them finger tight.
Figure 40. RF PCB attached to the RF Power Module Screws.
Pick up the entire assembly and secure the four corners of the bottom
cover to the 2-D fasteners with 3/16” (4.8 mm) black screws (Figure 41).
The rear panel screws should already be in place. The other holes will
secure the front and side covers in later steps.
Figure 41. Bottom Cover Attached to a 2-D Fastener.
Inspect the RF power module to be sure you have the module and
hardware installed exactly as shown in Figure 42.
Figure 42. RF Amplifier Module Mounting Hardware.
Form the RF power module leads so they rest flat on the PCB
solder pads. If necessary, loosen the nuts slightly to allow the module
to move within the limits of its screw holes.
Hold the RF Power module in place and tighten both screws and
nuts to secure it.
i
Be sure the four screws holding the RF Power module and
heat spreader are tightened securely to ensure good heat transfer.
Otherwise the RF Power module may overheat and fail.
Solder the RF power module leads to their corresponding pads on
the PCB. Before soldering, trim the leads as needed so they do not
extend beyond the solder pads.