Hi First thing to check is the solder joints on the 9 pin connector. For whatever reason they seem to be an issue. Second is to check the RS-232 driver chip. On most units one or the other takes care of the issue. Having no -12V supply or a blown / shorted negative rail *could* be the issue. Usually it’s not ….
Bob > On Jan 14, 2019, at 2:01 PM, David Van Horn > <[email protected]> wrote: > > I have a couple of thunderbolts that appear to have dead com ports. > Is there a schematic available? > > I have another that is working, so I'm sure it's not the USB serial or cable > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
