Re: KIO2 Malfunction
Posted by
Don Wilhelm-4 on
Dec 25, 2009; 12:27am
URL: http://elecraft.85.s1.nabble.com/KIO2-Malfunction-tp4213518p4214994.html
Larry,
Other than that negative voltage supply, the 5 volt regulator, and the
12 volt line, there is just not other places to look for a problem. The
MAX1406 just handles two RS-232 signals in this application, TXD and
RXD, so there is nothing on the board to stress the chip.
73,
Don W3FPR
KT4G wrote:
> Hello Don,
>
> Thanks for the insight. I checked D4 and it seemed to be ok. I went ahead
> and removed U1 and the voltage on the D1 anode rose from -3.3 to -11.5! U1
> must be bad. The only question is what made it that way?
>
> I'm going to order a couple of 1406's from Mouser and see if that indeed
> fixes the problem. If the original chip suffered from a latent defect (in
> other words, was the proverbial "time bomb" waiting to go off), then I
> should be ok. If the failure was due to another faulty component then at
> least I've got a spare...
>
>
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