Recently, upon returning from an outing, an obvious Tek product had been abandoned
on the front porch of the house. Took it inside and it had been treated well seemingly
over the years. No signs of storage with rats or mice, no grit or grime on the case etc.
Firing it up revealed a marvelous crt display. Woo-Hoo. Both channels seem to have
matching sensitivity and all the knobs and switches are in place like the day it was
unpacked from the shipping box.
Now the wart. I cannot obtain sync. No matter the source, both channels display a
running trace.
Looked at an online manual but became lost in the myriad triggering signal paths.
One thing that did catch my eye was a Tektronix IC, U780, which seemed central
to all triggering.
Before trying to wrap my head around this and going down multiple wrong rabbit
holes, are there known problems to look for in the triggering circuit?
Regards
Chuck
