Look at D9 off of Q3. The zener is bad.
David Assaf, III W5XU From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Steve Wedge Sent: Thursday, July 28, 2011 8:52 PM To: Jerry Semones; drakelist@zerobeat.net Subject: Re: [Drakelist] R-4A PTO: It wasn't the transistors (entirely) Yeah, I already did that and there was evidence that a previous owner did, too. Looks like the "dog-bone" is next. Gotta find a 3000 pF SM cap. Guess I shoulda ordered one from Mouser when I got the transistors. Steve Wedge, W1ES/4 "I can't complain, but sometimes I still do." - Joe Walsh If the above message appears, it came from Steve's Son of Laptop! ----- Original Message ----- From: Jerry Semones <mailto:grand...@insightbb.com> To: Steve Wedge <mailto:w1es1...@earthlink.net> ; drakelist@zerobeat.net Sent: Thursday, July 28, 2011 9:38 PM Subject: Re: [Drakelist] R-4A PTO: It wasn't the transistors (entirely) Steve, for what it's worth I had a very similar problem with the PTO in my R4B sometime ago. I reheated all of the connections on the PTO circuit board and it cured my problem. 73' Jerry K4FJK ----- Original Message ----- From: Steve Wedge <mailto:w1es1...@earthlink.net> To: drakelist@zerobeat.net Sent: Thursday, July 28, 2011 9:07 PM Subject: [Drakelist] R-4A PTO: It wasn't the transistors (entirely) Replaced both transistors - the osc with the correct 2N706A and the buffer with a 2N3904 (the '3858's are no longer made and the ones left are stupid-expensive). Unfortunately, it's still jumping around like a five-year-old on a sugar-buzz. Scratch the transistors as the culprits - though the signal quality does sound a little better. Looking at the worm drive/yoke, I'm wondering: how much slop is acceptablebetween the worm drive and the yoke? Mine seems to have a significant amount. I'm also tending back toward capacitors again. that largish brown one: is there anything "special" about it? I've heard at least a couple of reports of that being the culprit. 73, Steve Wedge, W1ES/4 "I can't complain, but sometimes I still do." - Joe Walsh If the above message appears, it came from Steve's Son of Laptop! _____ _______________________________________________ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist _____ No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1390 / Virus Database: 1518/3793 - Release Date: 07/28/11
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