[Elecraft] KPA100 No PA PS??

[Chris Hurlbut]

Here are my voltage readings taken from everything on page 23:

U1 pin 1 - 1.35v
U1 pin 7 - 1.97v
U1 pin 13 - .00
U1 pin 14 - .6
U1 pin 15 - .4
U1 pin 20 - 1.2
U1 pin 27 - 2.0
U1 pin 28 - 2.0
U2 pin 10 - 13.4
U4 pin 1 - 13.4
U4 pin 11 - 1.4
U5 pin 1 - .05
U5 pin 7 - .05
U6 pin 6 - .01

Definitely some problems there.  Sounds like U1 is bad??? 

-Chris KL9A

On Tue, 2006-05-09 at 22:21 -0400, c_hurlbut at adelphia.net wrote:
> I have had the basic K2 up and going for a while, and have been using it
> while I build the KPA100.  Got the KPA100 built and all the inital tests
> were fine on RX.  I came down to the shack today (school club statio) to
> align the TX (since I don't have a 50w dummy load at home) and I ran into a
> problem.  
> 
> I was adjusting C1 and all was fine.  OK, on to the next step.  I had the
> plastic handled screwdriver in my hand while reading the manual, and I
> dropped it.  Right into the opened KPA100.  A couple sparks went flying. 
> It looks like it hit the ground jumper on the front of the board since
> there is a black spot on it.  Who knows what else it hit.
> 
> Here's the problem.  Ever since then, I get the NO PA PS message, even
> without a PS connected to the K2.  I can just plug in the PS to the KPA100,
> and it turns on.  I also get audio from my antenna connected to the KPA100.
> There is no antenna connected to the K2.  Then after the NO PA PS message
> goes away, the audio goes to zero (no antenna) but the rig stays on. 
> Connecting the antenna to the K2 shows that it reverts back to the K2
> antenna port.  *BUT* it doesn't do this ALL the time.  The other times I
> turn it on, it just thinks the KPA100 is gone entirely, and I don't get a
> NO PA PS message.  It just turns on and is silent.  Again, this is with
> EVERYTHING plugged into the KPA100.  The speaker works all the time.  
> 
> Any ideas???  I am thinking (hoping?) it's just a chip that I can order
> easily.  Where should I start testing?
> 
> Thanks,
> Chris KL9A
> 
> 
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-- 
Chris Hurlbut <c_hurlbut at adelphia.net>