[Elecraft] K2/100 7211 TX Power output meter stopped working

[Don Wilhelm]

Mike,

Check the power control 5 watts requested.  If you actually get more 
than 10 watts output then either the diodes (I understand you replaced 
them) or KPA100 U6 may be the cause - there are a few other 
possibilities too.

During a TUNE, you should have voltage into U6 pin 3, and approximately 
twice that voltage at U6 pin 7.
If no output at U6 pin 7, check U6 pin 8.  If it is not 5 volts, then 
you have a firmware problem.

73,
Don W3FPR

On 1/3/2014 8:21 AM, Mike Sanders wrote:
> Sorry that should have been D16 and 17. I'm going to look at the
> circuit again and again. 73
>
>               K0AZ
>         Mike Sanders
> EM37cd SW Missouri
>       www.k0az.com
>
>
>
>
>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Mike Sanders
> Sent: Friday, January 03, 2014 7:13 AM
> To: Elecraft at mailman.qth.net
> Subject: [Elecraft] K2/100 7211 TX Power output meter stopped working
>
> Good Morning, Yeah, not sure what happened but appears when in
> high power mode over 10 watts power control does not work either.
> It gives full output. I just replaced diodes D1 and D2 1N5711s but
> the problem continues the same. Before I get any deeper into this does
> anyone have any experience with this failure and any ideas? I sure
> thought the diodes would fix this. I triple checked my work and the
> orientation of the diodes on the board.  73, Mike K0AZ
>
>