Hi Maggie, Thank you so much for responding, I was afraid everyone was out fourthing.
I seriously hoped you were wrong about checking the soldering on U1 as the pins are hidden by the glass-thing on the front side. But, I dutifully checked everything again and made an absolutely ghastly discovery!!! I can't operate a DMM! Seriously, I wouldn't have thought it would make a difference on resistance checking, but I guess that is not the case. I had done the checking by probing with the common lead while the other lead was grounded. I reversed the connections, and now all checks are within normal range. Many of the other checks are different, now, but they had been in-range before. Well, I guess you're never too old to learn something. This is my first DMM, always done it with analog meters before. Thanks and have a great fourth! On to the rest of the adventure! Tom, W3QS -----Original Message----- From: Margaret Leber [mailto:[EMAIL PROTECTED] Sent: Saturday, July 02, 2005 11:51 AM To: tom.w3qs Cc: [email protected] Subject: Re: [Elecraft] K2 Build Question tom.w3qs wrote: > 1. Resistance checks for U1 pins 1 & 2 are out of spec. Chart says > 25 - 35 K for both pins. DMM reads 17 K for both. Old analog meter > reads 8 - 9 K for both. > > 2. Resistance checks for J1 pin 15 is out of spec. Chart says 10 - 60 K. > Analog meter reads 80 K. > > Perhaps the resistance chart does not take the added SSB stuff into account? > U1 pin 1 and J1 pin 15 are both associated with this added circuitry. I did the same build you did (well, on S/N 1641 anyway)...and noted the resistance check values after adding the KSB2 components using a Triplett 2030A DMM. U1 pins 1 & 2 : 30Kohm J1 pin 15: 31Kohm So whatever the reason for what you're seeing, I don't think we can blame it on the KSB components being present. You might want to inspect things again. It's *very* easy to overlook soldering a pin or two on the LCD or one of the processor chips, and have things sorta almost work anyway because the pin's in a plated-through hole making intermittant contact. I did that more than once. 73 de Maggie K3XS -- -----/___. _)Margaret Stephanie Leber CCP, SCJP/"The art of progress / ----/(, /| /| http://voicenet.com/~maggie SCWCD/ is to preserve order/ ---/ / | / | _ _ _ ` _ AOPA 925383/ amid change and to / --/ ) / |/ |_(_(_(_/_(_/__(__(/_ K3XS / preserve change amid/ -/ (_/ ' .-/ .-/ ARRL 39280 /order."-A.N.Whitehead/ /________________(_/_(_/_______AMSAT 32844_/<[EMAIL PROTECTED]>/ _______________________________________________ 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
