Elecraft KXBC3 - Manual (Page 10)

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Locate P3 on the control panel pc board. It is between the battery connector and the microphone jack on the
end panel (see Figure 5). J2 on the KXBC3 will plug into this connector.
Figure 5. Connector P3 on the Control Panel Board.
Hold the KXBC3 module so you can see that each pin on P3 is started into the corresponding opening in J2
on the module (see Figure 6). Hold the module against the pins while carefully tilting it parallel to the control
panel board so the pins insert straight into J2, then press on the module to engage the pins. There is normally
some resistance at the very beginning, which is why it is important to have the connectors properly aligned.
Figure 6. Positioning the KXBC3 Module on P3.