Elecraft KPA500 Kit Assembly Manual - Manual (Page 35)

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Move the transformer onto the edge of the bottom cover but do not place it over the bolt (see Figure 49).
Lay the transformer flat with the leads exiting on the top and oriented so the orange lead will reach the terminal
as shown. Take care not to dislodge the rubber bumpers you installed in the previous step. Connect the orange
lead to the power supply module as shown.
Figure 49. Connecting the Orange Transformer Wire to the Power Supply Module.
Carefully lift the transformer onto the bolt without pulling the orange lead loose. As you set it down, be
sure you don’t have wires trapped between the transformer and the Z-Bracket and press it toward the Z-Bracket
so it clears the bumpers as shown in Figure 50. Note that the bolt may not be exactly centered in the opening in
the middle of the transformer. That is normal.
Figure 50. Transformer Bumpers.