Silly question perhaps, but did you make sure the fan cable is plugged in? See the figure "Connecting the Fan Cable to the Power Supply Module." - fig 37 on page 27 in the Rev D manual.
An ohmmeter at the fan connector will tell you if there is continuity through the fans. If the fan runs when you shut the KPA500 off at the front panel, then you know the wiring is good. In that case the first thing I'd do is reload the firmware in case there is glitch in the current load. 73, Ron AC7AC -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Oliver Dröse Sent: Monday, October 03, 2011 1:13 PM To: [email protected] Subject: [Elecraft] KPA500 #431 & no fan running Hi guys, just to report that I finished building my KPA500 this afternoon. Everything seems to be well except that the fan is not working, neither in NOR menu setting nor if I set the speed manually to any value between 1 and 6. Anyone any idea on that? Double-checked all the cabling again, all ribbon cables are tight and correctly mounted (checked that first as I remembered someboy with the same problem and that being the cause). Thanks in advance! Vy 73, Olli - DH8BQA ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
