Re: 2235 2mV vertical range noise and surprising fixes
regarding the 2235 secondary psu rectifiers:
YES, it is possible to see leaky, shorted or open secondary supply rectifiers,
which results in big ripple. this is FAR less common than bad caps (over 90% of the problems) but it does happen after many years. if I cannot get the bus voltage ripple low enough (just compare to other supplies), that's the next item to replace. I've only had to do it a few times, but that's more than never.
one more thing, I always use a floating device to measure DC volts and ripple, the Fluke 867B graphical multimeter works great for me, I can see everything at once, and no ground interactions.
Walter Shawlee 2
Sphere Research Corp. 3394 Sunnyside Rd.
West Kelowna, BC, V1Z 2V4 CANADA
Phone: +1 (250-769-1834 -:- http://www.sphere.bc.ca
+We're all in one boat, no matter how it looks to you. (WS2)
+All you need is love. (John Lennon)
+But, that doesn't mean other things don't come in handy. (WS2)
+Nature is trying very hard to make us succeed, but nature does not depend on us.
We are not the only experiment. (R. Buckminster Fuller)