The case of the reclusive decimal point:
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The case of the reclusive decimal point:
 
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K1 Gurus:
I have a K1 that does not display the decimal point. It has appeared occasionally, but most of the time it is invisible. On one camping trip it was visible for 2 hrs. This weekend it was visible in the late night for 4 hrs , but not visible in the early morning, and it was definitely cold at both times. At the home shack it is almost never visible. The only times I have seen it are when I am camping..maybe it is telling me something? I sometimes am able to see a shadow of its existence if I look at the display at an acute angle. I have examined the display connections and re-heated the joints adjacent to the point. I have passed a toothbrush over those same connections and the decimal has re-appeared for a short look around but then returns to its lair. I assume this is from static electricity. Could humidity have anything to do with the problem? Assuming that this decimal can be made to unveil itself long before its brother sun spots make regular appearances, I would like some advise on how to encourage it along. Otherwise this K1 display seems to be functioning correctly. Thanks! Stewart KE7LKW K1 #2257 _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
Re: The case of the reclusive decimal point:
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Stewart,
You said you have resoldered the LCD connections, but what about the other end of the wire? Granted, the 'wire' in this case is a PC trace, but the same rule holds, both ends must be firmly connected for current to flow unimpeded. Check Front Panel U1 pins 15 and 21 carefully, in fact, check all the soldering at the U1 pins. Not meaning to criticize your work without seeing your soldering, BUT ... There is a tendency among builders to apply too much solder, and that will mask a solder connection that was not properly heated. If your solder connections do not have a concave appearance on the fillet (especially if they have a convex surface), too much solder may have been applied - the solution is to wick away most all the solder and reheat/resolder each suspicious connection. A good solder connection will have an almost invisible edge on both the solder pad and the component lead. Someone on this reflector stated it quite nicely - "The solder connections should look like mountains, but not volcanoes!" Check out the soldering tutorial on the Elecraft website if you do not know what a good solder connection should look like - there are good diagrams in that document. 73, Don W3FPR Catherine Flick & Stewart Fletcher wrote: > K1 Gurus: > > I have a K1 that does not display the decimal point. It has appeared occasionally, but most of the time it is invisible. On one camping trip it was visible for 2 hrs. This weekend it was visible in the late night for 4 hrs , but not visible in the early morning, and it was definitely cold at both times. At the home shack it is almost never visible. The only times I have seen it are when I am camping..maybe it is telling me something? I sometimes am able to see a shadow of its existence if I look at the display at an acute angle. I have examined the display connections and re-heated the joints adjacent to the point. I have passed a toothbrush over those same connections and the decimal has re-appeared for a short look around but then returns to its lair. I assume this is from static electricity. Could humidity have anything to do with the problem? > > Assuming that this decimal can be made to unveil itself long before its brother sun spots make regular appearances, I would like some advise on how to encourage it along. Otherwise this K1 display seems to be functioning correctly. > > Thanks! > Stewart KE7LKW K1 #2257 > > Elecraft mailing list Post to: [hidden email] 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 |
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I am at step 1 of KAT100 testing. When K2 is turned
on, indicators default to Ant 1 and Low Power. I cant get them to change, as my ATU is unrecognized. I am using latest firmware. I have traced the Aux bus from my K2/100 board all the way into the KAT100. I reflowed all the solder joints at the MCU, and even replaced the MCU. When the K2 goes into transmit the 4 MHz clock does appear. I am lost as to how to proceed. Has anyone run into a similar malady? I didn't try taking off the front panel board, but I think I have tried everything else. How do I know my K2 is producing a useful aux bus to communicate with the KAT100 ? My K2 is #2117 - yes I did modify the resistor required on the K2 control board. ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
RE: The case of the reclusive decimal point:
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In reply to this post by Catherine Flick & Stewart Fletcher
On Mon Jan 21 2008 at 19:39 Don wrote ...
... the solution is to wick away most all the solder and reheat/resolder each suspicious connection. -- I'm not an expert on the subject of soldering but I know someone who is. While watching her reheat a joint I noted that she first applied a drop of liquid flux from a small pen-like dispenser. She explained that you should always add flux when reheating a joint otherwise the heat can cause oxidation which can make thing worse instead of better. I hope someone will find this comment helpful. 73, Gary KI4GGX P.S. Great subject line Stewart! Reminds me of those Perry Mason made-for-TV movies! _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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