Chuck, One can only guess at the root cause, but for starters I would suggest checking the continuity on the miniature RF Chokes in the KIO2.
If all looks well there, try changing the MAX1406 chip (U1). I am assuming you are using a remote KPA100 - the control for the KAT100 and the KPA100 do not use the same lines as the computer interface (that is why a special cable is required at the K2 end of the computer link). Only the serial interface signals (RXD and TXD) flow through the MAX1406 (CMOS to RS-232 level converter is the function of the MAX1406). As for the voltages on U1, only signal pins 5,6 and 11,12 are used, and I would expect something other than 0 volts at pin 5 based on a +5 volt nominal signal at pin 12., so I susspect your MAX1406 chip may be bad, but check the inductors first. 73, Don W3FPR > -----Original Message----- > > K2 KIO2 Problem. > > A few days ago we had a power fluctuation in our neighborhood. The surge > protector and Battery Backup UPS did not help. The Power surge > took out my > computer hard drive, serial interface card and it would appear had some > affect on my KIO2. > > > > The KIO2 still works with my KAT-100 and KPA 100 Change Bands and > Tune, but > I cannot make any connection with the computer serial interface card. I > have run the Serial interface Test several times. Of course I > replaced the > serial card and hard drive, I even switched computers, NO JOY. > > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
