Michael, An 8R voltage of 6.43 volts is an indication of something wrong there - it should be about 7.5 volts, no lower than 7.35 volts.
Have you checked the input voltage (emitter) to Control Board Q2? (should be 8 volts unless the regulator output is low) and the base voltage (should be about 0.7 volts below the emitter voltage) - if both those conditions are true, the trnasistor should be conducting properly. Is the voltage at the drain of Q4 close to zero volts? If not, Q4 is not conducting properly - check the gate, it should be at least 4 volts (normally almost 5 volts). You may have something drawing too much current from the 8R line or Q2 or Q4 may be bad. 73, Don W3FPR > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Michael L. > Hasenfratz Sr. > Sent: Saturday, April 16, 2005 3:37 AM > To: elecraft@mailman.qth.net > Subject: [Elecraft] Trying to get help, one more time... > > > > Does anyone (i.e. Elecraft) know the Auxbus protocol? And > is the spec > available? > > I beleive, in trying to find out why the 8R voltage is at > 6.43v, I blew the > MCU (controller board) AuxBUS output. > > I only see pin 40 drop a few tens of millivolts during a band change > request. > > The IOC starts and stops the clock on power up, no relays > change and that's > all the RF board does. > > Info 080 is displayed during powerup and on a band change request. > > That says the IOC or the AuxBUS is in trouble. > > Since I didn't get any response for my last question, I'm > hoping this one > is more interesting to the readers. > > 73's de Mike WA6FXT > // [EMAIL PROTECTED] > // [EMAIL PROTECTED] > > > > _______________________________________________ > 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 > > _______________________________________________ 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
