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Appendix D: In Case of Difficulty
Your Kantronics KPC-3 Plus is manufactured to very stringent quality standards. If you
have followed the installation procedures outlined in this manual, it is highly unlikely that
you will encounter a failure. If you do have difficulty, use the procedures described in
this section to assist in isolating and correcting the problem.
KPC-3 Plus Does Not “Sign-On” to Computer
1. Carefully recheck cabling between your computer serial port and the KPC-3 Plus.
2. Check carefully to insure that the Transmit Data, Receive Data, and Ground leads
are connected to the proper pins.
3. If you have made a 5-wire connection to the computer serial port, change to a 3-wire
connection. To use HyperTerminal, you need a 5 wire connection, so if you change
to a 3 wire connection, you will need to use another terminal communication
program.
4. Check your terminal program to be certain it is configured with the correct
communications parameters (serial port, baud, parity).
5. Try a ―Hard Reset‖ using the Hard Reset jumper. (Operate your terminal program at
1200 baud when performing a hard reset.)
You Are Unable to Make a “Connect”
1. Issue a connect request and observe the TNC‘s XMIT LED. If the XMIT LED
illuminates, check to insure that the radio is connected to the radio port. If the XMIT
LED does not illuminate, check to be sure the XMITOK command is turned ON.
2. Observe the radio to determine if it is being switched to the ―Transmit‖ condition. If
not, recheck wiring between the KPC-3 Plus radio port, PTT pin, and ground on the
microphone jack.
3. Set the CD command to INTERNAL and turn the radio squelch control to ―OFF‖ and
see if the RCV LED illuminates on the packet controller. If it does not light, recheck
the audio connection between your transceiver and the KPC-3 Plus.
4. If possible, monitor your transmitted signal with another radio. If the transmitter is
keying to ―Transmit‖ but weak or no audio is monitored, increase AFSK output as
necessary using R13. (See the AFSK Output Level section.)
Cannot Transmit
1. Check the XMITOK command – it must be ON to allow transmitting.
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