[Elecraft] K1 with Issues

[Don Wilhelm]

Chuck,

Glad to hear of your success.  Enjoy that K1.

73,
Don W3FPR

cstoverva at aol.com wrote:
>  Hi Don,
>
> You nailed it!? Lesson learned on my part.? 
>
> There was a difference in voltages between pins 4 and 5 of RP5 and pin 5 of U1.? I cleaned up around RP5, R19 and R20 and reflowed the solder connections with no real change in symptoms.? I lifted the key jack from the board.? Although I could see nothing with my eyes on the board, when I swabbed the area with a Q tip and Isopropyl the Q tip turned bright red.
>
> The loss of transmit I noted turn out to be a loss of both transmit and receive.? I was on the dummy load so didn't notice how quiet the receiver was until I switched to an antenna.? Apparently a relay got hung up in all the electronic commotion.? I cycled the band switch and everything popped back to life when I came back to band 1.
>
> I disassembled the rig and gave each board a good cleaning and didn't find anymore red stuff.
>
> It's all back together now and working fine.
>
> Thanks.
>
> Chuck K4QS
>
>
>  
>
>
>  
>
> -----Original Message-----
> From: Don Wilhelm <w3fpr at embarqmail.com>
> To: cstoverva at aol.com
> Cc: elecraft at mailman.qth.net
> Sent: Thu, 16 Apr 2009 9:38 am
> Subject: Re: [Elecraft] K1 with Issues
>
>
>
>
>
>
>
>
>
> Chuck,?
> ?
>
> Flux cleaners are *not* recommended for that very reason.  The flux 
> residue by itself is non-conductive, but when combined with a cleaner, 
> it can create high resistance (leakage) paths unless it is completely 
> removed.  Flushing an area with cleaner is almost certain to cause 
> trouble, and can result in 'mysterious behaviors' that are hard to track 
> down and expensive repairs.?
> ?
>
> If a builder finds a need to remove the flux, it is best done using a 
> cotton swab (Q-Tip) and denatured alcohol or rubbing alcohol working 
> only in small areas at a time.?
> ?
>
> 73,?
>
> Don W3FPR?
> ?
>
> cstoverva at aol.com wrote:?
>
>   
>>  Hi Don,?
>>     
>
>   
>> ?
>>     
>
>   
>> Your comment about using flux cleaner struck a nerve with me.? I didn't have any cleaner at the time of completion and obtained some a while back.? I don't remember exactly when.? I had an idle mind and hands one day and opened up the K1 to spiff things up.? I let it dry for a week and put it back together and it worked fine.?
>>     
>
>   
>> ?
>>     
>
>   
>> The keying misbehaved a little during the previous use of the K1.? I cleaned the paddle contacts and reseated the plug and all seemed well.? Problem solved, or so I thought.? These two events probably relate.?
>>     
>
>   
>> ?
>>     
>
>   
>> At first opportunity I will make the voltage checks and take a look under the key jack. I'll post the results.? Right now I'm off to install an antenna on my Volunteer Fire Departments new utility truck.?
>>     
>
>   
>> ?
>>     
>
>   
>> Thanks.?
>>     
>
>   
>> ?
>>     
>
>   
>> 73,? Chuck K4QS?
>>     
>
>   
>>   
>> ?
>>     
>
>
>
>  
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com 
> Version: 8.5.285 / Virus Database: 270.11.59/2064 - Release Date: 04/17/09 07:08:00
>
>