[Elecraft] K2 KPA100 SWR Bridge Readings Way Too High

[Dick Lamb]

The SWR bridge on my K2/KPA100 had been working perfectly for years, but I
apparently blew something while making comparison measurements with a
friend's K2 I was trying to fix. Now the K2 panel LCD SWR indicator reads
around 5:1 for a near-perfect dummy load.  Adjusting C1 makes almost no
difference.  I can force the SWR to read 1:1 by setting R26 toward one end
of its travel and R27 toward the opposite end of its travel (instead of
both at midpoint), but then every load reads as 1:1 SWR.  Replacing D16 and
D17 didn't help (I tried it twice).  Except for the SWR reading, everything
seems OK.  Perhaps I should try replacing U5 and U6?  Other ideas?   Dick,
K0KK