[Elecraft] k2 kpa100 fault

[John Cooper]

The power input on the kpa100 has a short of around 17ohms from the black to red anderson powerpoles.  I havent used it in a couple of months but the last time I used it all was fine.  I check for solder bridges and for loose items that could have fallen and shorted something, found nothing. The inner power connector that plugs into the k2 is not shorted.  The basic k2 powers up just fine but pluggin in the kpa100 immediately kills the power supply.  I pulled the following parts because I followed every which way the positive wire comes in and these had a connection to ground.  (12PA)


D9
D10
C85
C48
C49
C51-57
R38-39
Q1-2 FINALS
C30
C34
R32
Q4
R14
R13
R40
R8


these parts checked good and none raised the resistance reading on my power input.  

then I pulled U7 
back to normal.  somehow it shorted from pins 2,8 to pin 4 which is ground.  

this started off as a I need help email. thought I would post anyway.

John Cooper WT5Y