[Elecraft] No power output after upgrades and mods

[Don Wilhelm]

Roger,

Let me venture a guess here - check the cuts you made on pin 6 of J13 (RF
board) - that used to be the 8T line and that signal was replaced with
VRFDET.  If you did not completely remove the 8T line from pin 6 (or cut the
wrong pin - which is easy to do), the microprocessor would sense a high
voltage (during transmit time) on VRFDET and throttle back the K2 power,
reducing the output power - that would account for your low signal level at
U9 pin 6.

73,
Don W3FPR

----- Original Message ----- 

> Gurus,
>         After upgrading the K2 firmware to 2.04 and 1.09 and adding the
> K60XV,  I have no power output on transmit on any band (160-10)!
>         The receiver seems to work fine.  The display recognizes firmware
> 2.04 and 1.09.  I have a sidetone.  I am able to activate all 6
transverter
> sites and have peaked the 60M and 40M bands with a noise generator. BUT
when
> the power is set to 2 watts, it drops to 0.4 watts when I press TUNE.
>          I have re-checked the resistance on the collectors of Q6,Q7, and
Q8
> and they are all above 1Meg.  The voltage on Q6, Q7 & Q8 is 13.3 vdc on
> Recv. Q6 drops to 13.24 when I press TUNE and Q7 & Q8 drop to 13.26
>          I removed the SSB Adapter and installed jumpers at J9 and J10 and
a
> .001 (102) cap between pins 5 & 12 of J11. I also removed the K60XV board
> and installed a jumper between pins 3 and 5 of J13 and a 4.7 pf cap
between
> pin 1 & 3 of J15 in preparation for signal tracing.  This allowed me to
> check the key down signals on U10 pin 4 (0.018vrms) and U9 pin 6
> (0.021vrms).  I don't know how to interpret the low reading on U9 pin 6.
>          Nevertheless, I tested W6 and got a reading that started at .016,
> rose briefly to .297 and dropped to .016 again.  Likewise, D1 tested at
> .016-.302-.016.  My Fluke 77 DMM reads .001 with the RF probe leads
attached
> to nothing, but reads .020 when the ground lead is attached to the K2's
> ground. I am not certain that it is working properly.
>          So that is the story.  What do you think is happening?  I have
> checked for solder bridges, component value errors and cold solder joints
> and will continue to re-check each step of the upgrades and modification.