On Mon, Oct 11, 2004 at 04:45:24PM +1300, Ron W wrote: > Hi , > Just been fault finding a K2 for a chap here. the problem was no V > bias-xfil , so the filters couldn't be set. Nothing appeared to be coming > out of U10 on the Control board, and resistance values around it seemed > odd, so I gave the IC the chop. The resistances were still strange > ....impossible in fact, and it appeared that both RP2 and RP3 might be > crook. Something that sounded too strange to be true. I took out RP2 ( 82k) > . Better, but still had strange readings, so out comes RP3 ( 47k) and the > readings looked like what one would expect with all the components removed!! > Metering RP3 showed it was not 5 individual resistances. They were all > joined together and ranged in resistance from 93k to 41k. In fact I was > getting a reading of 90k from pin 1 to pin 10......no wonder the poor old ( > now deceased) U10 was not functioning. > Has anyone else been fooled by a crook RP?? It sure had me bluffed for a > while...... > Incidently......RP2 was fine....but has rather short legs now... > Cheers.......Ron ZL1TW >
What is the number on RP3? Did you install one of the other resistor packs by mistake (which I did in one case)? Some of them are individual resistances, while others consist of several resistors all tied to a single point. Bob, N7XY _______________________________________________ Elecraft mailing list Post to: [email protected] 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
