[Elecraft] K2, HiCurr, and power output

[jclaunay@crssa.net]

Hi!

I encountered a problem during the Alignment and Test Part III of my K2 n°4018
(p71 of Rev E, Feb. 20023).
When I hold the TUNE button, I read in the display HiCurr , I can't adjust L1
and automatically HiCurr disapeares after few seconds.

I red a lot of post on the server, and I concluded that it coulds be due to the :
1/ R/T switching circuit
2/ oscillating PA
3/ a problem in VRFDET or V PWR or VALC circuits.

First I checked the T/R circuit , especially 8R and 8T lines :
I found :
on 8R : in RX, 8V and in TX : 7 V (!!) instead of 0V !!
on 8T : in RX : 0V and in TX : 7,40 V

SO I changed the 2N7000 (Q3 and Q4 and also Q23) as many guys encountered
problem with failed 2N7000 .
The new measures are the following, with a DMM :
RX TX
Q1 E 8V [OK] 8V [OK]
B 8V [OK] 7,17V [OK, I think]
C 0V [OK] 7,41V [OK, I think]

RX TX
Q2 E 8V [OK] 8V [OK]
B 7,22V [OK] 7,21V [OK, I think]
C 7,88V [OK] 5,61V [WRONG !I think it should be ZERO]

RX TX
Q3 S 0V [OK] 0V [OK, I think]
G 0V [OK] 5V [OK, I think, from pin 27/U6]
D 8V [OK] 0V [OK, I think]

RX TX
Q4 S 0V [OK] 0V [OK, I think]
G 5,1V [OK, from pin28/U6] 0V [OK, I think]
D 0V [OK] 4V [OK, I think]

In transmit I have always the HiCurr displayed and I can't adjust L1.
So please <<<<HELP!!!!!!!!!>>>>>>>

What I have to do now ?

Thanks.

73'

Jean-Claude
F1TTW
Grenoble
FRANCE