Thanks Chris. I'm beginning to think my 5370B is heading towards a boat anchor.
We (as in all time-nut owners of 5370s) seriously need to research a replacement part/circuit for the 7061/7062 parts. Jim On 22 December 2015 at 07:44, Christopher E. Brown <[email protected]> wrote: > > You might want to re-scope the start and stop channel outputs where they > cross A4 and > verify against the front panel labels. > > The signal line crossing A4 that lines up with frontpanel start is start > and the one that > lines up with stop is stop. > > > I mention this because the A3 board is a carry over from another unit and > the start/stop > labeling on the board itself is reversed from the 5370B front panel labels > and the parts > list follows the board labeling. So, if you read front panel and lookup > P/N in list you > get the wrong one. > > > The safe thing is to follow back from the output crossing A4 that is > failing and > physically pull the hybrid and read the P/N on the mounting frame. It > should be a metal > can in a screw together frame, the part is socketed. > > > Once the A3 is out, do not remove the screws in frame, they just clamp the > frame to part. > Whole thing is held in by the collar on the pot shaft. > > > For a 5370B > > 5088-7061 (start channel hybrid) > 5088-7062 (stop channel hybrid) > > the manual lists it reversed, and they are actually different parts (not > just diff > mounting frames) with crossed up triggers. > > > 7061 (actual start manual lists as stop) is the one that usually fails and > is almost > impossible to find. Took me several years (and the help of another nut > with a parts unit) > to get a working one. 7062 is much easier to find. > > > On 12/13/2015 11:26 AM, Jim Palfreyman wrote: > > Oops yes! I looked up the wrong item. I meant A3U1 which is 5088-7061 > > > > Jim > > > > > > On Sunday, 13 December 2015, Cok <[email protected]> wrote: > > > >> According to the partlist A4U1 and A4U2 seems to be TL072CP opamps. > >> > >>> > >>> [email protected] said: > >>> > >>>> I have gone through the troubleshooting process from the manual and it > >>>> seems > >>>> to point to A4U2 (Schmidt trigger) being faulty. > >>>> > >>> I'd put a scope on it to check. > >>> > >>> Before I dive into this, does anyone have any advice? Most important > being > >>>> the Schmidt trigger - where do I get one? > >>>> > >>> You need more info - the manufacturer's part number or something like > >>> that. > >>> > >>> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
