[Elecraft] K2/KPA100 power adjustment problem

[Jess Gypin]

Hi all,
I finally got the last part into the KPA100. It was missing C71. After
pulling the board out and installing the cap, now I am not getting any power
adjustment at low power or high power. With the KPA100 removed, the power
adjustment is fine. The low power adjustment goes from about .1 watt to
about 12 watts. With the KPA100 installed, the RF out display still shows
that the power should be adjustable, but the low power output, below 11
watts, is maxed out with no lowering or adjustment of power. Above 11 watts,
power output is full 100+ watts with no adjustment. Has anyone got any tips
on where to start looking?

Also, have connected the serial cable after getting it built, turned on the
K2IO in the menu PORT function, but it appears that I am not communicating
with the K2 at all. No test characters when using HyperTerminal and no
control using various K2 software programs. Would also like some tips on
where to start the troubleshooting of this problem. I have checked the
cable, know it is wired right according to the directions using 2-2, 3-3 and
5-5 with the hardware loop installed. Also know that my computer is fine
because I use it to run my FT817 with Ham Radio Deluxe.

Jess AE0CW