Elecraft KPA500 Kit Assembly Manual - Manual (Page 21)

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Locate the I/O module, the 10 wire ribbon cable and the 40 wire ribbon cable. Mount the ribbon cables on
the I/O module as shown in Figure 24.
Be certain that the ribbon cables are oriented as shown in Figure 24 and that the
connectors engage both rows of pins.
Figure 24. Mounting Cables on the I/O Board.
Check the I/O board D-sub connectors for jackscrew nuts (see Figure 24). Remove them if present.
Install the I/O module on the rear panel as shown in Figure 25. Note that the module installs with the
bottom of the pc board facing upward, just under the mains power entry module.
Figure 25. Installing the I/O Module in the Rear Panel.
Set the Rear Panel assembly aside in a safe place until it is called for later.