[Elecraft] kpa 100 wont play

[Don Wilhelm]

George,

Since you suspect no power to U1, I suggest you look at the schematic to
identify the pins of U1 that are connected to the 5 volt supply line and
check for the presence of voltage with a DVM.

If you find no 5 volts where it should be, then check the regulator U3.  You
should have 12 volts on the IN lead and 5 volts on the OUT leg.  If you have
12 volts but no 5 volts, be certain U3 is oriented correctly.  If there is
not 12 volts on the IN leg, check for the presence of 12 volts at P1 pin 8 -
that voltage comes from the K2 over the ribbon cable.

73,
Don W3FPR

> -----Original Message-----
>
> Last night I did the first check of the com for the PA stage. I did not
> get any NO PA PS msg from the k2.
> It seems like the U1 is not getting power but I have no idea how
> to check
> this.
> Any ideas?
>
> Thanks
>
> George NE2I
>
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1:26 PM