K2 won't come on.

[kf4clo]

HI EVERYONE
  My K2 has been working great for over a year. turned it on this evening and the light flashed and the internal fuse blew. I removed all the options(100watt,noise blanker and ssb board). hooked a meter to the ground and 12v input and have 12v with the k2 on or off. U4 and u5 (regulated power supplies on the control board) Nothing. I might have to send it to Elecraft but any ideas would be great.

[Don Wilhelm-4]

Well, the first thing to do is measure the resistance from the collector
of Q7 or Q8 to ground.  If it is lower than 1.5k, then you have a PA
transistor problem.  If that is indeed the case, the installation of
K2PAKIT will likely solve your problem - install Q11 and Q13 too just to
be safe.  You may not have to send it to Elecraft repair after all.  We
try to assist to keep the number of support staff repairs at a minimum -
that is consistent with "you built it, and you can maintain it".  
Unofficial help is available here on the Elecraft reflector, and
official help at [hidden email].

The base K2 PA transistors are now being supplied as a matched pair, and
will serve better than a random pair.

73,
Don W3FPR


On 12/27/2011 8:03 PM, kf4clo wrote:
> HI EVERYONE
>    My K2 has been working great for over a year. turned it on this evening
> and the light flashed and the internal fuse blew. I removed all the
> options(100watt,noise blanker and ssb board). hooked a meter to the ground
> and 12v input and have 12v with the k2 on or off. U4 and u5 (regulated power
> supplies on the control board) Nothing. I might have to send it to Elecraft
> but any ideas would be great.
>
>
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[Alan Davenport]

What may havew happened is your finals have failed. Try removing T3. This will remove 12V from the finals. Try to see if it will then power up. If so you have found your answer. Order a new set.
 
   73 and good luck,
   Al W2GZN

From: kf4clo <[hidden email]>
To: [hidden email]
Sent: Tuesday, December 27, 2011 8:03 PM
Subject: [Elecraft] K2 won't come on.

HI EVERYONE
  My K2 has been working great for over a year. turned it on this evening
and the light flashed and the internal fuse blew. I removed all the
options(100watt,noise blanker and ssb board). hooked a meter to the ground
and 12v input and have 12v with the k2 on or off. U4 and u5 (regulated power
supplies on the control board) Nothing. I might have to send it to Elecraft
but any ideas would be great.

--
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______________________________________________________________
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Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html