[Elecraft] Help with K2 recieve troubleshooting

[Brian]

Hello everyone, 

 

I am having trouble figuring out where to go next with my troubleshooting.
Here is what I have so far.  

 

I have poor receive on all bands.  The 1st thing I did was check my
soldering. Then I did the cheap and dirty signal tracing as suggested by
N0SS.  Here are my results from that.  

 

I tuned into a loud broadcast station on 7256 khz.  I was receiving 5 led
lights with the antenna plugged in normally.  (this station was 60db over s9
on my TS-2000)

Using the recommended probe I got the following:

 

1 RF Board (2 of 4), C143, input to the TUF-1 Receive Mixer.

            6 led lights

2 RF Board (2 of 4), C141, input to the Preamp. Test with the preamp ON and
OFF.

Signal levels should drop somewhat (but not disappear) when the Preamp is
OFF.

            8 led lights (preamp on)  6 led lights (preamp off)

3 RF Board (2 of 4), C53, input to the Attenuator. Test with Atten. ON and
OFF. Signal

levels should drop somewhat (but not disappear) when the Attenuator is ON.

            4 led lights (att on)  6 led lights (att off)

4 RF Board (2 of 4), D6, output of the BPF (Band-Pass Filter).

            9 led lights

5 RF Board (3 of 4), junction of C4 & C5, wiper of K1a (output 40M BPF).

            9 led lights

6 RF Board (3 of 4), junction of C7 & C8, wiper of K1b (input 40M BPF).

            9 led lights

7 RF Board (3 of 4), Jumper W6, input to BPF.

            9 led lights

8 RF Board (3 of 4), junction of D2 & D3, part of the T-R switch

            9 led lights

9 RF Board (3 of 4), junction of D3 & D4, part of the T-R switch

            Flux from 4-6 led lights

10 RF Board (3 of 4), Jumper W1, output of LPF (Low-Pass Filter)

            5 led lights

11 RF Board (3 of 4), C225, wiper of K12a, output of 40M LPF

            5 led lights

12 RF Board (3 of 4), C226 middle of 40M LPF

            3 led lights

13 RF Board (3 of 4), C227, wiper of K12b, input of 40M LPF

            5 led lights

 

I'm really stumped at this point.  Any and all help would be appreciated.  

 

 

Brian 

N1WNC

K2 5946