You may have blown the PA transistors. I had the EXACT same thing happen to me (Dropped test lead) and that is what happened. Try removing T3. This will remove power to the PA transistors and then try powering up. If you are lucky it should power up fine. The PA transistors were $15 USD from Elecraft.
Good luck. 73 de Al, W2GZN ________________________________ From: "[email protected]" <[email protected]> To: Elecraft Group <[email protected]> Sent: Sun, October 24, 2010 9:08:24 AM Subject: [Elecraft] K2: K2 #6996 is dead - please help! Hi All, K2 #6998 has had a short life. Working perfectly with KSB2/KDSP2/KNB2 all installed until tonight. I decided to tweak one of the BFO settings, connected the frequency counter to the control board and was about to connect it to the BFO test point on the RF board, when I dropped the tip into the vicinity of Q6/Q7 - can't say exactly where it landed, but I heard a click and the K2 went dead. I waited a few minutes and powered up again, thinking the resetting fuse might have tripped. Now the K2 starts, the Elecraft initialisation appears, the frequency readout appears, and by this time (3 seconds or so) the self-resetting fuse gets hot and the K2 shuts down. I guess I have a short. No visible evidence of where - I took the K2 apart to look. Resistance tests on the front board and control boards are all OK. Resistance tests on the RF board are no longer normal: Q7 base resistance to ground = 538ohm (ref 2.5 - 3.0kohm) Q7 collector resistance to ground = 400ohm ( ref > 500ohm) Other measurements: Q6 base resistance to ground = 119 ohm, collector 475 ohm, emitter short to ground Q8 base resistance to ground = 538ohm, collector 473 ohm, emitter short to ground. I'd be grateful for any advice how to proceed from here. This is in the category of bad things to happen! And the KPA100 is nearly finished :( Thanks and 73, John VK7JB ------------------------------------------------------------ This email was sent from Netspace Webmail: http://www.netspace.net.au ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
