[Elecraft] KPA100 U1 pin 3 -> ground | failure

[Don Wilhelm]

Dave,

Yes, that is not good - you need a new 2N7000.  Those FETs are quite 
sensitive to static and likely became zapped at some point.

Send a note to Elecraft (parts at elecraft.com) and request a new one.

73,
Don W3FPR

David Wilburn wrote:
> During the initial tests (from the right side of page 21 in the KPA100 
> manual) on U1 pin 3 -> ground, I measured just under 4k as opposed to 
> the > 10k.
> 
> I pulled out the schematic and checked pins 3 and 4 of the R-pack, and 
> they measured correctly.  When I checked Q11, I read a bit over 100 ohms 
> across the source and drain in both directions.  I pulled Q11 and the 
> reading on U1 pin 3 went to greater than 10k.  I measured both 
> directions of S & D on Q11 once it was out, and still read about 120 ohms.
> 
> I get the impression this is not good.