On Dec 16, 2011, at 11:25 AM, Brooke Clarke wrote: > Just a guess. If line triggering does that there may be a problem with the > power transformer. > Use an Ohm meter to locate the transformer terminals for the AC line and then > check from one of those to all the other terminals. > I suspect there's a short in the transformer. > Look at U502 to see of it's burned up.
Actually, I'm more confused what U502 actually is. The revision M manual calls it both a LM2901 quad comparator (parts list and two sections) as well as a MC12040 phase comparator. The little PCB soldered into U502 has MC12040 silk-screened on it. Kevin _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
