[Elecraft] [ELECRAFT] K2 don't communicate with KPA100/KAT100(in same EC2)

[Bo Andersson]

My K2 and KPA100/KAT100 have served me for over 10 years now without any problem!
 
After that I made the frequency calibration of K2 I made a mistake when I put contact from KIO2 and KAT2 to Control board. I put the Contact one unit up, pin 3 from KIO2/KAT2 come on pin1 on P4. 
 
When I put all together and test, KPA100/KAT100 (both in same EC2) don’t respond. 
 
Using Ant ½ I got answer ”PA ANT 1” also when I use menuitem ”ATU” I got the same answer ”PA ANT 1”
I hear a relay click in KPA100 when I switch on the radio.
 
Testing single K2/KIO2/KAT2 all work well.
 
Testing K2/KPA100 got 20 W with 1 – 10 W on powerbutton and full power on over 10 W.
Can’t change power with the powerbutton.
 
Perhaps U6 on Control Board is out of order! I measure all pin and got som differens against value in the manual.
 
Pin                 My U6          U6
 
  6                  0.0                 4.7
10                  0.0                 5.0
13                  0.7                 2.3
18                  5.0                 0.0
25                  5.0                 0.0
33                  0.08               5.0
36                  4.6                 0.8
39                  1.02               0.2
 
Hope I manage to explain the problem!

73 Bo/SM6FPG