K2 Dead receiver

[n5jeh]

I am borrowing this K2. I have had it for 2 weeks. The owner just had it
back from elecraft for some issues.
It worked as advertised for almost 2 weeks. When I turned it on the other
day I got the INFO 80 message.
Looking at a few things I found that the +6 volt regulator had the output
pin not soldered to the bottom of the board. Re soldering solved the Info 80
problem. Now the receiver is dead dead. not a signal to be heard.
Using an rf gen, I can hear the signal loud in the speaker at all the
frequencies I used.. But still no signals anywhere with antennas connected.
I believe there is a problem in the IF string.
At the base of Q22 I see a 1mhz signal. I believe this should be about
4.9mhz. At the mixer TUF-1(pin 4) I see the Rx VFO  8Mhz signal ok but
on(pin 1) I see 1.0 mhz.Any help?


Ed  N5JEH
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[Don Wilhelm-4]

Ed,

You may see both 4.9 MHz and some other frequencies at Q22 - it all
depends on the input signal and the VFO frequencies - thay can produce a
number of mixing products.

Do you have the problem on one band?  If so, check the menu to see if RX
ANT has been turned on - that is a per band setting.

Since you have an RF generator and a 'scope, you have the equipment to
do Receive Signal Tracing to localize the problem to one stage. The
procedure is in Appendix E of the manual.  If you do not have the
manual, you can download it from the Elecraft website.

73,
Don W3FPR

On 6/29/2013 1:50 PM, n5jeh wrote:

> I am borrowing this K2. I have had it for 2 weeks. The owner just had
> it back from elecraft for some issues.
> It worked as advertised for almost 2 weeks. When I turned it on the
> other day I got the INFO 80 message.
> Looking at a few things I found that the +6 volt regulator had the
> output pin not soldered to the bottom of the board. Re soldering
> solved the Info 80 problem. Now the receiver is dead dead. not a
> signal to be heard.
> Using an rf gen, I can hear the signal loud in the speaker at all the
> frequencies I used.. But still no signals anywhere with antennas
> connected.
> I believe there is a problem in the IF string.
> At the base of Q22 I see a 1mhz signal. I believe this should be about
> 4.9mhz. At the mixer TUF-1(pin 4) I see the Rx VFO  8Mhz signal ok but
> on(pin 1) I see 1.0 mhz.Any help?
>
> Ed  N5JEH
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

______________________________________________________________
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Please help support this email list: http://www.qsl.net/donate.html