Elecraft KPA100 Manual - Manual (Page 25)

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Plug one end of the ribbon cable into the Control board at P4. The
correct end can be determined from Figure 14. The black wire should be
oriented toward the lower end of P4 (away from pin 1). If the indicated
end of the ribbon cable cannot be plugged in at P4, the keying insert may
be installed at the wrong position.
Figure 14
Plug the other end of the ribbon cable into the KPA100 at P1. The
correct orientation is shown in Figure 15.
The SSB option microcontroller (U1, KSB2) must have revision
1.06 firmware or later. Check the label to determine the revision. If it's
older than 1.06, a new 28-pin IC (16C72A or 16F872) should have been
supplied with your KPA100 kit. Install it at this time, with pin 1 of the IC
oriented toward the left side of the K2.
12 K2
GND
P1
Ribbon Cable
To Control
Board, P4
GND AF SPKR GND
Figure 15
Connect a 12-14 volt power supply or battery to the K2's DC input
jack (DC barrel connector, J3 on the RF board).
Turn on the K2; you should see ELECRAFT on the LCD,
followed by NO PA PS. This message is a reminder that no high-
current power supply is connected to the KPA100 yet. You may also hear
relays switching on the KPA100 (in addition to the K2 relays).
P4
P5
Black Wire
Pin 1 Mark