Mike,
What is the serial number of your K2? That is helpful information - the
Field Test K2s (SN 100 or less) are a bit different than the Rev A K2.
There should be only one diode from Q18 gate to ground. The anode
connects to the gate and the cathode to ground.
While the VFO/ALC mod is a benefit, it will not produce any change in
the S-meter.
As for the S-meter problem, determine if it is an LED display problem or
a problem with the actual S-meter circuit. Rotate the RF Gain control
from full clockwise slowly to the CCW position. If the LED display is
working, you will see the S-meter indication increase.
If it does not, you have a display problem - reflow the soldering on the
LED bargraph and Front Panel RP2, then check again.
73,
Don W3FPR
On 5/31/2019 9:42 PM, Mike Short wrote:
> I recently bought a used K2/10 and the S-Meter does not work. I am looking
> at the K2 VFO/ALC mod and have a question about the 1N4148s that are added
> to Q18.
>
> This one has a 1N4148 installed on the bottom of the board anode to cathode
> across D13, and no diode from Q18-S to ground. Was the additional diode
> part of another mod? Seems to me that it would defeat the purpose of D13.
>
> Mike
> AI4NS
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