[Elecraft] [K2] Re: Was Working Fine... Then HiCur

[Steve Dyer]

Thanks Ron. Yes, Don replied and suggested some things to look at (thanks Don!).

And yes, it does it when the KPA100 is removed.

73,
Steve
W1SRD




________________________________
From: Ron D'Eau Claire <ron at cobi.biz>
To: Steve Dyer <sdyer at pacbell.net>; Elecraft at mailman.qth.net
Sent: Wed, April 4, 2012 2:50:46 PM
Subject: RE: [Elecraft] [K2] Re:  Was Working Fine... Then HiCur

Don, W3FPR, will have suggestions. He must be away today, but he services
K2's and K2/100's and has done so for many years. He is an invaluable
resource on this reflector. 

One question: Does it do the fault with the KPA100 removed? That will tell
you which part of the K2 to start looking in. 

Ron AC7AC

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Steve Dyer
Sent: Wednesday, April 04, 2012 12:03 PM
To: Elecraft at mailman.qth.net
Subject: [Elecraft] [K2] Re: Was Working Fine... Then HiCur

Any suggestions or areas I can investigate from anyone?
73,
Steve




________________________________
From: Steve Dyer <sdyer at pacbell.net>
To: Elecraft at mailman.qth.net
Sent: Tue, April 3, 2012 8:35:04 AM
Subject: [Elecraft] Was Working Fine... Then HiCur


K2 new/old build. S/N is 2338, built base K2 and KNB2 10 years ago, put
away and only finished up recently with KPA100, KAT100 and KSB2. 



On air for couple weeks with good results. Suddenly starts giving
intermittent 
HiCur messages yesterday. 


Tore out KPA100 and KSB2. 

-Occurs on all bands tested (40, 30, 20, 17, 12, 10) (no dummy  load, but 
checked R with Rig Experts AA-54 and tested close to 50 ohm  points with
almost 
no Z). 

-Happens with Tune or keying at all power settings 
-Message displays at key-up when hand keying/tune, will happen quickly with 
keyer and then fold-back power. 

-Cal Cur is 3.5A 
-Measured power output with external wattmeter (SX-200) and power tracked
fairly 

closely to setting 

-Will not happen if power is lowered to < 
-Checked power supply output voltage with DMM and it matches the K2 display 
voltage +.4V. PS is set to 14V. 

-Current draw on 40M @ 12W is 2.3A 13.1V (.5V drop), 17M @ 12W = 3.44A 12.9V

(.7V drop) 

-On 40M Q7 Base is .611V Q8 is .612V  
-Completely disassembled and visually inspected all solder with  magnifying 
glass and re-heated common transformers and chokes in final.  Re-seated IOC
and 
MCU (lifted slightly and pushed back into socket). 

-Checked T4 windings 
-Have done the DC voltage tests suggested in the various threads about
HiCurr 
and everything looks normal. 



73, 
Steve 
W1SRD 
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