Re: [Elecraft_K3] change the processor board?


harry latterman <harrylatterman@...>
 

Chas

What is the S/N of your radio... As mentioned you might have a older one without the gold contacts. I have two K3's and one is like that. I had TX die on me and once I pulled the AMP out and clean the contacts it has been working fine ever since... In you case I suspect it is the front panel board. Easy...well not really easy.. fix will be to pull the front panel off and clean contracts and plug it back in.. The reason I said not really easy is there are a lot of pins connecting the front panel and DSP board to the main board.  I was give and dead K3 and had fun bringing life into it. In my case I had to send the front panel+DSP board in since I had 5 push buttons that did not work. Less then 2 weeks later I got boards back and completed the repair, which lead me to the pins on the AMP module...which are tinned and not gold..

2 cents  back under my rock...Good luck and hope this suggestion helps

73 Harry K7ZOV



From: "skyviewcharles@... [Elecraft_K3]"
To: Elecraft_K3@...
Sent: Sunday, August 21, 2016 9:50 AM
Subject: [Elecraft_K3] change the processor board?

 
My K3 now has two distinct bugs.  One bug that's been present for several months occurs during the first few minutes of warm-up (until the indicated FacePlate FP temperature is above about 27C), when I turn the VFO control the relays click and the freq jumps to an arbitrary and non-standard value such as 246.200 MHz.  Yes, I wrote two hundred and forty six point two Megahertz.  The second bug is more recent and highly frustrating.  Only on 75/80 meter band does this occur.  After about one minute of transmission the output power will drop back from 100 W down to about 35 W (CW output for example or simply pressing XMIT to send a constant carrier) .  The only way to clear this condition is by turning off the rig and turning it back on.  This is when running into a known good 50 Ohm dummy load.  It's not heat related, it's not the SWR foldback function kicking in.  Nothing like that.  It appears to be a "control related bug'.  When it is limited to about 35 W out (Bird Wattmeter), adjusting the power out control indicates "100 W" but it's outputting about 35 Watts.  All other bands do not do this while the rig is confirmed in this trouble condition on 75/80 meters.  In other words when the power is limited to about 35 W out on 75/80 meters I confirmed a proper 100 W out on all other bands.  Very strange to be limited to the one band.

My question to the K3 owners out there - have any of you had similar apparent processor related bugs and simply shot gunned the repair by changing out the main board that contains the uP?  That may be less expensive than pursuing the formal evaluation/repair approach.

Thanks for any suggestions.  I know I can send it to the K3 hospital but it's not covered by Obamacare (yet anyway) so I'm looking at other possible approaches.  Anybody been down this buggy road?

73 N6AF Chas


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