Hi all, Have decided to get stuck into fault finding my 5650A again. With no replies from FEI over the past 2 months, have decided to trace out the PCB the good old fasioned way, however the only IC on the 1 inch square PCB PCB has me completely lost.
So to the question, has any one ever come across a device marking of 27M4Bl or possibly a bad i(I) not an L(l)?? It's a SMD 14 pin Case751, with Gnd on pin 11 and Vcc on pin 4. This device is on the Rubidium lamp PCB and forms part of the Rb thermal control circuit. I am leaning towards a quad op amp, but it's possible failure makes it very difficult to diagnose, it could also be a comparator. Any suggestions are welcome. Regards Gerald _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts