Hello to the group! I'm afraid I need to lean on your collective K2 troubleshooting expertise. After a long break I have finally made it to the Alignment and Test Part 2 of my build. Everything was going OK until I got to the VCO Test. I have no signal at TP1. I have tested this with the built in counter as well as an external counter. I have gone through some of the troubleshooting I could find online:
The orientation of D13 and D8 look good I have checked the soldering at relays K13, K14 and K15 and the value of C72. I have checked the varactors at D21 through D26 and they are oriented properly I am nearly certain they are all the correct type I tested RFC15 in the circuit and could not get any continuity through it. When I pulled it out of the circuit it tested fine so I put it back in. I'm sure this is something basic I just dont understand. I know there is some more testing I can do with Q17 and Q18 (I did check that they are the right type and orientation I also check all the component values around Q18) Lets set that aside for just a second though... Here is where I think it gets a little weird. Looking at the schematic I followed it back to U4. When I compared the voltage table to what i was actually seeing on U4 I think I may have found my problem. According to the table pin 7 should have 0 Volts but i'm showing 4.8! It also shows that pin 13 should have 4 volts but I'm showing 0. All other pins are normal and match the chart. Following Pin 7 of U4 back to Pin 1 of U5 I see the same 4.8 volts. This is supposed to be a clock line so I'm confused where this sort of voltage would be comming from. I'm still new to alot of this and this is by far the most complex kit I've taken on so any and all help will be appreciated! Thanks and 73, Robert AD0TA -- === I could tell you a UDP joke, but you might not get it. === ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
