Re: [Elecraft] Reversed connections from KIO2 to KAT100
Gil, Actually things may not be all that bad and you may find that the only components damaged are the KPA100 firmware chip and KPA100 U6. However, you should be prepared with all the parts that Gary listed just in case. Reversing the color sequence would have placed 12 volts on the KPA100 VRFDET line which goes to U6 and would likely cause its early demise. The same combination would have placed the KPA100 12CTRL line onto the K2 VRFDET line, but there is no source in the KPA100 for the 12CTRL line and the K2 microprocessor may have survived. Similarly the K2 8R line would have been placed onto the KPA100 AUXBUS line, and surely would have killed the KPA100 firmware chip, but going the other way and placing the 8R line from the KPA100 onto the K2 auxbus line may have caused no damage since there is no source in the KPA100 for voltage on the 8R line. Does the base K2 still work? If so, you may have been fortunate. 73, Don W3FPR Gil Gibbs wrote: I've hit a wall with one of the strangest situations, having simply not taken time to recheck all my connections on the DB9 connector from the KIO2 to the KAT100. I had the KIO2 pins reversed in color order, from 6 to 9, plugged it in to smoke test the circuit to the KAT100, and got zero results. When I checked with Gary, I was informed that some seven parts, on three boards, have to be replaced, and I'm wondering if anyone else has had this same miscue, can give me hints about what other problems have been caused by the miswiring? I have to do a lot of major surgery on the boards, and might have to realign the Control Board. Any hints and kinks beyond the missives I've already gotten will be appreciated. Murphy's Law strikes again, right at a critical time!! ___ 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
[Elecraft] Reversed connections from KIO2 to KAT100
I've hit a wall with one of the strangest situations, having simply not taken time to recheck all my connections on the DB9 connector from the KIO2 to the KAT100. I had the KIO2 pins reversed in color order, from 6 to 9, plugged it in to smoke test the circuit to the KAT100, and got zero results. When I checked with Gary, I was informed that some seven parts, on three boards, have to be replaced, and I'm wondering if anyone else has had this same miscue, can give me hints about what other problems have been caused by the miswiring? I have to do a lot of major surgery on the boards, and might have to realign the Control Board. Any hints and kinks beyond the missives I've already gotten will be appreciated. Murphy's Law strikes again, right at a critical time!! 73's Gil WA5YKK ___ 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
Re: [Elecraft] Reversed connections from KIO2 to KAT100
Gil, a good technique is to make a copy of the schematic, maybe even with magnification, to see more easily where the leads of the connector go, (to which components). Then, with a colored pencil, trace out each pin to what it is connected to (component), and evaluate what the reversed voltage situation was, and then, if it could have failed the component connected to the pin. For example, consider that a capacitor might be connected to the pin you are tracing. If it is a ceramic disk, it is not polarity sensitive and likely would also be rated at a voltage high enough to withstand anything mis-connected to it. But, if the capacitor had been electrolytic, and the wiring problem placed a negative voltage on the positive side of the capacitor, you likely would want to change it, in case it has been compromised or stressed, even if it is not showing short or open at this time. In a like manner, you can find what active components, (transistors or ICs) might need to be swapped if they endured reversed voltages, or overvoltage, such as an input being connected to a DC bus voltage. GL and 73, Stuart K5KVH ___ 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
