Joe, The initial problem to be solved is that there is no indication of power output being fed back to the K2 microprocessor.
The most likely source is a bad solder connection and the second most likely is a misplaced component. Keep your testing periods short, ignore the high current messages for now, and proceed as follows: Start your search at RF Board diode D9 - if all is well at that point, there will be a DC voltage during transmit periods - how large it is depends on the amount of RF output, for now just be certain you have a good solid DC voltage there - anything over a volt or so will indicate that the RF Output Detector is working. Next point is on the Control Board - the VFRDET signal which appears at pin 10 of P4 - the DC voltage during transmit should be about the same as you measured at the cathode of D9. Lastly, check the VRFDET signal at the microprocessor - U6 pin 2. The voltage should be about the same as at P4 pin 10 if R12 is properly in place. Let us know where the VRFDET signal path is broken. 73, Don W3FPR > -----Original Message----- > > The build for K2 ser # 5628 has been going well until > I got to the "Alignment and Test Part III" 40 meter > transmitter alignment section. > > Problem: > > With current set to 2.0 AMPS and the power control > fully CCW I measured 7 watts on an external wattmeter. > The internal wattmeter had NO indication. When I press > the "tune" control with the display set for voltage > and current I see 13.3 volts and 1.88 amps. The > current will start to slowly rise at .02 amps per > second and will reach 2.00 amps in about 10 seconds > and the "HI CURRENT" message will appear with 7 watts > output. > > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.430 / Virus Database: 268.15.6/567 - Release Date: 12/4/2006 7:18 AM _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
