[Elecraft] KAT2 question abt voltage at U4, pin7

[KC9GBX]

After a recent calamity while attempting PSK31, where I introduced 13.5v  
into microphone jack pin 6 (a 5v line), repairs have been made, and I have made 
 
contacts in both cw and ssb modes.
 
However, I seem to be getting more HI CURRENT warnings on bands and at  power 
levels where previously, I did not.
 
I re-initialized the KAT2, and, as I cycle through L0-L8 and C0-C8, all  
relays provide a nice click.
 
I performed the dc voltage checks at the bottom of KAT2 manual, page  22.  
Everything was fine, except for U4, pin 7 where I got a reading of  4.74v 
instead of the 0v or nearly 0v that the manual implies I should see.   Could 
this be 
the cause of the HI CURRENT warnings?
 
Thanks for your  consideration.   
 73,  Jef Fox kc9gbx
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[Elecraft] all I wanted to do was give PSK31 a try, and now I've got real trouble

[KC9GBX]

So I purchased a NUE-PSK modem kit ( I had them do the surface-mount  
component soldering), and after I had completed my portion of the soldering,  
things 
checked out fine.
 
I also ordered the cable that connects the modem to my K2, but I was  
informed that the cable would be shipped separately.  After waiting for  nearly 
a 
month without receiving the cable, I decided to make my own.  I  followed the 
generic cable-wiring diagram that NUE-PSK provided in the kit  assembly manual.
 
My crash-scene investigation revealed that I had pumped 13.5 volts from the  
modem into the K2's microphone jack, pin 6, which is marked on the K2 
schematic  as a 5 volt line.
 
Now, when I push the K2's POWER ON button, I hear an initial relay click,  
but that's it!!!
No LCD display, no bar graph, no audio, no band or mode change  occurs.  
 
I'm hoping that I only fried the 5 volt regulator, U5, on the Control  Board, 
but I'm pessimistic by nature!  I didn't see or smell any  smoke.  Any ideas 
would be most appreciated!
 
It's been a great low-power rig for more than 4 years, and I'd sure like to  
save it!
 

Here's  hoping, and 73, Jef Fox kc9gbx
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