Hi all, In my previous email I had described that I had my kpa100 working in the K2 enclosure but that it had died when I tried to install it in the EC2 case. I was getting "info 080" and Lyle Johnson had suggested a problem with the aux bus line. I have refined search down to the 5 V line that supplies the max 1406. When I remove U1 on the kpa100 board I get a dead short at pin 1 of U1. This could mean that the 5 V regulator is bad but there are other components connected to this line and any one of these components could be defective (U3, U4, C23, C89, U6, etc).
I am now faced with developing a procedure to isolate the bad part. I have already inspected the board for shorts and do not see any. The fact that the kpa100 worked before leads me to believe that a component may have shorted itself out. I could destructively remove each component until the short disappeared but then I would need to replace possibly a lot of parts. The other option would be to isolate each part one at a time by cutting traces. Once the part was deemed OK, I would have to patch the trace and go on to the next part. I would end up with a lot of patched traces. Any suggestions? Thanks, Steve, W2MY -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.323 / Virus Database: 267.9.1/51 - Release Date: 7/18/2005 _______________________________________________ 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
