[Elecraft] Dead K2

[Kristina Wright]

OK, here's what I've done so far: checked the resistance from the
power plug to ground, the meter read infinite resistance. Also checked
the voltage at the same and got 12 volts. Then I measured the voltage
at the cathode end of D10 and got 12 volts with the power switch on
and off, but at D12 I got nothing with the power off and 0.7 volts
with it on. Obviously the fuse is being tripped, but I still don't see
any shorts (yes I inspected the whole board carefully).
  Thanks for the help so far, any more ideas?

73,
Kristina, KE7LUC


Jim, <k4zm at comcast.net> wrote:

Check the voltage at the power connector when it is dead and see if
you have 12 volts there.  Also check on the other side of the
resetable fuse on the right side of the rf board and make sure it is
not opening up.  A good place to check the voltage is at the cathode
end of the big power diode on the right side of the rf board.  and at
the pins of the on/off switch.

Jim K4ZM

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Don Wilhelm <w3fpr at earthlink.net> wrote:

> OK, check the resistance from the coaxial power plug to ground both with
> the switch on and with it off.  If you find the resistance at 500 ohms
> or more, then the K2 is likely OK, check your power supply and cord for
> good solid connections - you are using a proper regulated power supply
> rated at 3 amps or greater are you not?
>
> If all is OK there, measure the voltage at D10 cathode and D12 cathode
> (with the power turned on - of course).
>
> 73,
> Don W3FPR