K3 S/N 7394 RF Out = 0 Problem

[Brian F. Wruble-2]

This is a continuation of yesterday's issues.

In retracing my steps, I see that the basic K3 passed the Transmitter Gain
Calibration step and the rig with the KPA3 installed did as well.
 Something went awry after that.  After that, I added only the KRX-3.  I
got distracted by a problem with that, and I never realized things had
changed in the RF Output department.

Does anyone have a checklist of voltages, resistance readings, etc. that I
can go down in looking for the problem.  I will start by removing the KRX-3
(subreceiver), and seeing if it works then.

Your thought are much appreciated.

73 de Brian W3BW


*Brian F. Wruble, C.F.A.

*70 is the new 40.*
*
Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930
eFax  305.768.0278
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[Brian F. Wruble-2]

OK, I have un-built the kit back to before the KPA3 was installed.  It still fails the 5 watt Transmitter Gain Calibration Procedure.  I cannot detect any RF out.  Perhaps unbuilding the kit creates it's own set of problems, but this test worked "on the way up."  It also worked with the PA installed.  It stopped working when I installed the sub-receiver.  That is now no longer installed.  

Again, all suggestions welcome

De Brian W3BW


--
70 is the new 40.

Brian F. Wruble, C.F.A.
1107 Key Plaza, PMB 447 Key West, FL 33040
Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930    
eFax  305.768.0278   Skype   bwruble  


Begin forwarded message:

> From: "Brian F. Wruble" <[hidden email]>
> Date: May 26, 2013, 1:05:02 PM EDT
> To: Elecraft Reflector <[hidden email]>, [hidden email]
> Subject: K3 S/N 7394 RF Out = 0 Problem
> Reply-To: [hidden email]
>
> This is a continuation of yesterday's issues.  
>
> In retracing my steps, I see that the basic K3 passed the Transmitter Gain Calibration step and the rig with the KPA3 installed did as well.  Something went awry after that.  After that, I added only the KRX-3.  I got distracted by a problem with that, and I never realized things had changed in the RF Output department.
>
> Does anyone have a checklist of voltages, resistance readings, etc. that I can go down in looking for the problem.  I will start by removing the KRX-3 (subreceiver), and seeing if it works then.
>
> Your thought are much appreciated.
>
> 73 de Brian W3BW
>
>
> *Brian F. Wruble, C.F.A.
>
> 70 is the new 40.
> *
> Mail: 1107 Key Plaza, PMB 447 Key West, FL 33040-4077  
> Summers: P.O.Box 57, 7400 Augustine Herman Highway, Georgetown, MD 21930  
> eFax  305.768.0278  
>
>
>
>
>

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[Andy Wood]

Hi Brian,

Make sure all of connectors between the front panel and the main pcb are mated / seated correctly.  I had some unusual intermittent problems, including no RF out, due to bad connections here. In my case, removing the front panel and giving the connectors treatment with deoxit solved all of the issues. MY S/N is early 3000 and has tin plated connectors. I believe the later units have gold connectors.

Just another thought, check that all of the TMP cables are seated fully.

If you are still stuck, I would suggest a phone call or email to Elecraft support. I have always found their product backup to be exemplary.

Andy  VK4KY