Elecraft KAT500 Owners Manual - Manual (Page 43)

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In the following steps you will prepare and install the top cover. But before you do, check to ensure
the screws inside the KAT500 are tight without over-tightening them:
 The 11 screws along the sides of the pc board (Figure 7, page 24).
 The four screws securing the SO-239 connector leads to the standoffs on the pc board (Figure 27,
page 36).
Locate the top cover and clean any tape or residue from around the holes on the inside surface along
the sides as shown in Figure 35. Note that not all of the screw holes have bare metal around them. Only
those shown need to be checked.
Figure 35. Preparing the Top Cover for Installation.