[Elecraft] K2 is dead?

[Ken G Kopp]

I'll add my enthusiastic endorsement for Don, W3FPR.  He's prompt and
reasonable.

73!

Ken - K0PP

On Feb 19, 2018 18:50, "Bill Johnson" <k9yeq at live.com> wrote:

> Dave,  my suggestion:  send it Don who is a fantastic expert. He is very
> reasonalble in his fees.  While I am technically competent, and have the
> equipment, he is natural at it.  I have to work at it, because unlike Don,
> don't do it day to day.  I have sent equipment to him and it is done in no
> time.  If you have time to do your own work, then give that a shot.  For
> me, life it too short.
>
>
> 73,
> Bill
> K9YEQ
>
>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces@
> mailman.qth.net] On Behalf Of Don Wilhelm
> Sent: Monday, February 19, 2018 6:28 PM
> To: David Perrin <dbperrin at gmail.com>; Elecraft <elecraft at mailman.qth.net>
> Subject: Re: [Elecraft] K2 is dead?
>
> David,[Bill] n
>
> There are several possibilities.
> While it is possible that the "serial" cable may have been the the
> problem, that could have damaged the KIO2 (or KPA100), but it could also
> have damaged the MCU (U6) on the control board.
>
> Did it go into transmit with no load?  If so, it may be that Q7 and Q8
> have been damaged.  Check the resistance from the collector to ground.
> It should start out at about 2k ohms and increase in resistance as the
> electrolytics charge.  If it is substantially less than that, the PA
> transistors may have been damaged - that will trip the internal resettable
> fuse (F1).
> To remove 12v power from the PA transistors, you can remove them (do that
> if the resistance check reveals them to be shorted), or you can remove
> transformer T3.
> After removing 12v from the PA transistors, see if the K2 powers on.
>
> I don't know of anyone who is skilled in troubleshooting the K2 in central
> FL, but someone may volunteer.
>
> If you remove the PA transistors and do not have adequate desoldering
> ability, clip the leads at the transistor bodies and remove the leads one
> at a time.  Clean up with solder wick and if solder remains in the holes,
> heat the pads and push the solder out with a wooden toothpick.
> Replace the PA transistors with the K2PAKIT from Elecraft - it has matched
> PA transistors.  I can give you some tests to check with the PA transistors
> out to check whether transistors Q11 and Q13 are OK (they are included with
> the K2PAKIT).
>
>
> 73,
> Don W3FPR
>
>
> On 2/19/2018 10:20 AM, David Perrin wrote:
> > Hi-
> >
> > Two questions?
> >
> > After 18 years my K2 doesn’t turn on. I did it. I must have incorrectly
> wired the Serial cable. When it got plugged in - that did it.
> >
> > There is power thru the Power button. With the radio disassembled to the
> main pc board, (sans everything that can plug into the main board) and
> power applied thru the 1/8” coaxial power connector power doesn’t seem to
> get beyond that.
> >
> > I am not in a place where I can get more parts out on the bench, nor the
> equipment except for a cheap digital Voltmeter.
> >
> > Question 1: Is there someone in the central Florida area who knows this
> radio and can shed some light on my problem?
> >
> > Question 2: Is there someone in central Florida who repairs the K2?
> >
> > Thanks for reading.
> >
> > 73 de Dave
> >
> > k1opq.4 at gmail.com
> >
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