[Elecraft] Low PLL Output

[Chuck]

Greeting to the List,

This is my first post.  I'm building K2 sn5939 and have hit a snag at alignment and test part II.  It actually went through all of the tests and alignment OK, but when I hooked an antenna up to try the receiver I notices some unusual symptoms.

To cut to the chase, what I have found is the PLL reference oscillator output low.  It measures .3v at pin 1 of U4.  The expected value is .8v-1.8v .  The frequency counter picks up the output and the output frequency varies over the proper range. 

I have checked yet again for bridges, cold solder joints and all component values.  All seems correct.

The DC source voltage measures 1.27v with an expected value of .8v .  This tells me Q19 is not conducting as it should.  Before I declare Q19 lightly toasted, does anyone have any ideas or suggestions?

Thanks.

Chuck K4QS



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