[Elecraft] [K2] K2/100 RF power indication not working - Blown D16 & D17?

[Don Wilhelm]

Bill,

Set the power at 50 watts and do a TUNE.
Is the output power at 20 to 25 watts?  If so, so far so good.
Now try a TUNE/DISPLAY (hold both buttons at once).  Is the power near 
50 watts?  If so, you have proper power control and the problem is with 
the LED display.

OTOH, if the actual power in both cases above goes to 100 watts or more, 
then the first step is to replace KPA100 D16 and D17.  If that does not 
fix things, there is likely another problem in the KPA100 wattmeter, 
likely KPA100 U6 - but get back with the information before replacing 
it, there are more tests to verify or deny that possibility.

73,
Don W3FPR

On 5/3/2019 10:25 PM, Bill Coleman wrote:
> I’ve recently seem a problem with my K2/100. It transmits ok, and the power level out tracks the power control, but the power indication LEDs remain at zero.
> 
> No, I’m not in ALC mode, I’m definitely in RF mode for the meter.
> 
> I’m using an external wattmeter (a Kenwood AT-250 in passthrough mode), and can definitely see 100 watts being transmitted.
> 
> I’m thinking that maybe D16 and D17 may have been fried. Is that a good guess?
>