Check to make sure that the -12V supply is present at the PCB. Hope this helps.
Joe -----Original Message----- From: time-nuts [mailto:[email protected]] On Behalf Of David Van Horn Sent: Monday, January 14, 2019 1:01 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Thunderbolt Schematics? 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.
