[Elecraft] K2 no rx audio

[Kevin Hulina]

SCOOOOOOOOORRRRRRRE!!!!!!
Thanks Don :)  In the end, I reflowed the control and front panel 
boards.  I wasn't able to see any bad solder joints (I am using a 
magnifier), but apparently there was one somewhere....  Powered it up 
and got noise :) :) :)

Kevin
W9KH


On 4/26/2015 7:39 AM, Don Wilhelm wrote:
> Kevin,
>
> Did you install the jumper wires at the R18 or R19 locations on the 
> Control Board?
> If you instead installed Control Board J1 and J2 in anticipation of 
> adding the KAF2 or KDSP2, you need to add a wire jumper between J1 pin 
> 1 and J2 pin 1 and another between J1 pin 2 and J2 pin 2 before you 
> can hear any audio from the RF board.
>
> If that is not the problem, take a look at the connector soldering on 
> the Control Board and the Front Panel Board.  Are all pins soldered - 
> especially pin 1 on the Front Panel.
>
> Examine those boards carefully for solder bridges.
> Follow the audio path on the schematic for the Control Board starting 
> on the right side of the schematic at the PD1 and PD2 points, through 
> the MUTE transistors Q6 and Q7, then onto the Front Panel AF1, AF2 and 
> AF3 signal lines.  You may have to remove the Front Panel metalwork to 
> gain access to those signal paths as they move to the front panel board.
> Touching a screwdriver to the AF1, AF2 and AF3 lines should result in 
> a bit of hum pickup.
>
> 73,
> Don W3FPR
>
> On 4/26/2015 6:51 AM, Kevin Hulina wrote:
>> I am going through the tests of my newly built K2 and I'm getting no 
>> receive audio.  I am able to get side tone, and if I give the radio a 
>> signal it shows up on the S meter, but I don't get any receive 
>> audio.  I have done the PLL reference oscillator, vco, bfo and agc 
>> tests.  All those seemed ok per the troubleshooting.  I have tried 
>> other bands and am not able to get the white (atmospheric) noise on 
>> any band.
>> Any thoughts?
>
>