[Elecraft] K2 3 amps on receive

[Don Wilhelm]

Lennart,

You are on the right track, but do not dismiss Q11 and Q13 yet.
I think your analysis about Q7 may be correct - but:
I would suggest that you remove Q7 and Q8 and again check the voltages -
if there is a problem with Q11/Q13, you will still have voltage at the
Q7/Q8 base locations - OTOH, if the voltage is zero (or close to that),
then the problem is collector to base leakage in either Q7 or Q8.  I
would replace them both.  The PA replacement kit from Elecraft contains
replacements for Q7, Q8, Q11 and Q13.

Another thing to check before going much further is to see if both 8R
and 8T both on during receive (only 8R should be present).  You can
easily check at the anodes of D6 and D7.  If both are present during
receive, the problem is with Q1 or Q3 on the Control Board.

Good luck with it.

73,
Don W3FPR

Lennart wrote:
> More information: where R55 and R56 are joined (and Q8 base), I have 0.87
> volts, but on Q7 base I have 0.93 which make me suspect that Q7 is bad. Both
> Q7 and Q8 should have the same dc level, right? 
> 
> This is all on receive with 0 volts on both sides of R61, the "bias" voltage
> on receive can not come from Q13. 
> 
> What is the proper voltage on Q7 and Q8 on receive? I would expect 0 volts
> and never above 0.6?
> 
> Regards,
> Lennart