[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 de SM6FPG /Bo