[Elecraft] No audio

[Don Wilhelm]

John,

The E27 message is expected when the filter board is not installed, but 
the E42 message is not.  E42 indicates that there is a problem with the VFO.
That is not normal, and can be the cause of 'no audio' or weak reception.

Investigate the E42 error first (plug the filter board in to eliminate 
the E27 error).  With the E42 error present, you may may hear no sound 
from the K1 because the VFO input to the mixer is inadequate.  Solve the 
VFO problem first by making sure the VFO is oscillating properly.

You should hear something (noise) if you connect an antenna (even a long 
piece of wire) to U2 pin 1.  If so, the product detector is working.  
Next try U1 pin 5 (connect the 'antenna' through a capacitor of .001uF 
value). and see if you still an hear noise.  If so, the xtal filter is 
working.

Next go to U5 pin 1 and see if you can hear any noise response.

Let us know where the noise response 'dies out' - that is an indication 
of the problem area.

73,
Don W3FPR

On 1/10/2016 7:09 PM, wingman67 via Elecraft wrote:
> I have recently built up a K1 to the point of the receiver alignment (page
> 36, 7 "Alignment and Test, Part 1").  Up until this point all of my test
> points have been successful, voltages correct, etc.  When I power on the K1
> I get the correct LED test pattern and then the E27/E42 error messages that
> are expected.
>
> However, when I begin going through the steps on page 36 all is well until I
> get to the point on page 37 where I turn on the sidetone.  I access the stl
> menu item, press-and-hold Menu and it comes up with 8 by default.  I can tap
> up and down, exit the menu and go back in and the eeprom remembers my
> settings.  I can turn the K1 off and back on, go back into the menus and
> access the stl menu and it remembered my setting.  The only problem is I
> hear nothing, either on the headphone jack or on the external speaker
> connector.  Everything else on the transceiver seems to function properly
> including turning on and off the attenuator, rit/xit, etc.  Just no sound of
> any kind.
>
>