Hi Guy, Thanks
260mA! Guess that would do it. Exploring the power supply etc now. Mike On 26-Apr-12 4:41 PM, Guy Olinger K2AV wrote: > Do you have the DB9 plug that connects to the back of the KIO2 > restricted to pins 2,3, 5 ONLY? See page 21 in the KIO2 manual. If > you have hooked up a full RS232 to the KIO2 DB9 there is no telling > what has gone wrong, you can cause all kinds of problems. > > http://www.elecraft.com/manual/KIO2_man_rev_B.pdf > > Also L4 connects pin 5 of the common signal ground to the ground bus > in the KIO2. If that goes through to a computer where a ground (black > 12V lead) has connected and your power supply to the K2 has a problem > in the ground (black) 12V supply wire to the K2 somewhere, and you > have other devices attached to the same power supply via common > grounding, including what is connected to the computer side of the USB > cable, the ground current attempting to flow via poor ground wire > connection will attempt to find any alternate route to the K2 any way > it can. That ground fault will blow L4 in the KIO2 board. > > Take a DVM and see if you can draw current between pin 5 on the cable > and the ground of the K2. If you can, you need to solve your power > supply problem. > > 73, Guy. > > On Thu, Apr 26, 2012 at 1:47 AM, VK1OO <[email protected] > <mailto:[email protected]>> wrote: > > Hi, > > My K2 rig control via a KIO2 stopped. I discovered that RF sub > miniature choke L4, 100 micro Henry, on the main KIO2 board was open > circuit - no evidence of excessive heat etc. L4 is in the RS232 > ground > path. Shorting out L4 restored rig control. I replaced L4 with a > larger version (all that I could find locally) but rig control didn't > work. I tested the new L4 and it was open circuit, again no > evidence of > excessive heat. So the question is, what would cause excessive > current > through L4? > > I feed the KIO2 via a USB to RS232 converter which plugs into a four > port USB hub which plugs into a lap top. This combination has > worked OK > for several years. > > Mike VK1OO > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > <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
