Hi Don, Thanks for suggestion. I do not have oscilloscope but I can hear 4 MHz from K3 by putting KRC2 board closer to K3 and confirm it is from KRC2 by on/off 12v to KRC2. If chip was damaged, as I am using anti static mat, how chip was damaged is mystery....
73 Kazu On 17 Mar 2010, at 14:30, Don Wilhelm wrote: > Kazu, > > Is there any chance that you can beg or borrow an oscilloscope to probe U1 > pins 13 and 14 to see if there is any 4 MHz oscillation? > If it is oscillating, my guess is that you have a damaged input or output pin > on the firmware chip. > If it is not oscillating, then either the firmware chip is bad or the crystal > is bad (or both). If you are ordering replacements from Elecraft, get both > just in case. > > 73, > Don W3FPR > > Kazunori Watanabe wrote: >> Thanks for everyone for suggestion. Here is some update. 1) Power polarity >> is right. :-) >> 2) LED is still off and no output, so page 15 test failed this time. 3) >> Checked soldering. Seems ok. 4) Try to connect to PC through firmware >> download software and configuration utility. However software cannot >> recognise. Well, so no LED means KRC2 is dead..... >> 5) Checking voltage of U1. Not a surprise Pin 9 and 10 are 0v as these are >> source of voltage of LED. Compare to page 28 chart, most of pin's voltage >> are ok EXCEPT, P3 0 >> P6 0 >> P8-10 0 >> P17 0 >> P27 0 >> P29 0 >> >> Wish I can fix it before RDXC! >> >> 73 de Kazu JK3GAD/M0CFW >> ______________________________________________________________ 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
