James, All those voltages look OK to me. The voltage on pin 11 is dependent on the state of the signal at pin 6. If you wish to test it, pull pin 6 to a negative level (jumper from pin 8 to 6) and you should see pin 11 go to 5 volts - a positive voltage on pin 6 should produce a 0 volt signal on pin 11. The reason you see zero volts there now is that the chip is interpreting the floating state of RXD at pin 6 as a positive voltage - all that is OK because voltages between -3 and +3 volts on the RS-232 signals are in a region of uncertainty.
Your problem likely lies with an unsoldered connection somewhere or a broken inductor - check the miniature inductors for continuity. You had previously reported 0 volts on pin 2 of the 9 pin connector, but you have -9.85 volts on pin 5 of U1 - the only series element between those points is an inductor and it is likely the path is open if the voltages at the two points are substantially different. 73, Don W3FPR > -----Original Message----- > > Alright, I followed the steps for "No (-) supply at U1-8" and this is > what I got: > > The oscillator was oscillating at 16.292 mhz > > I took the voltage readings of U1. > Pin 1 = 12.32 > Pin 2 = 0 > Pin 3 = 11.80 > Pin 4 = 0 > Pin 5 = -9.85 > Pin 6 = 0 > Pin 7 = 11.79 > Pin 8 = -9.85 > Pin 9 = 0 > Pin 10 = 0 > Pin 11 = 0 (This is supposed to have 5?) > Pin 12 = 5.06 > Pin 13 = 4.8 > Pin 14 = 0 > Pin 15 = 4.81 > Pin 16 = 4.81 > > The serial port is enabled in the menu. > > > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.338 / Virus Database: 267.10.10/73 - Release Date: 8/15/2005 _______________________________________________ Elecraft mailing list Post to: [email protected] 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
