Electrolytic capacitors: check them on the PSU, usually they are the first to look for.
On Sat, Jul 6, 2013 at 12:46 PM, Mark C. Stephens <ma...@non-stop.com.au> wrote: > Checked the PSU voltages on the PSU card next to the 10811. > The -5.2 is reading -4.2. > Took a look with the scope and instead of a nice flat DC I see a 4V Peak to > Peak spike @ 100Hz. > Trying to track down a service manual. > Any ideas on this one guys, if the Pass tranny was shorted, it would be a lot > more than 4.2V unless the overvoltage Zener is able to sink all that > current... > > > -marki > > > -----Original Message----- > From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of Mark C. Stephens > Sent: Saturday, 6 July 2013 8:18 PM > To: time-nuts@febo.com > Subject: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting > normally, PB LEDS scannning and appears to be reading o/k > > I went to use my 5370B todayt and noticed the LEDS on the display are slowly > sort of pulsing bright one after another. > Also all the push button LEDS are going on and off one by one. > The strangest thing is that it appears to be working o/k via HPIB. > > I don't have extender boards but I do have a signature analyser. > > Could it be something silly like one of the PSU regulator has gone kaput? > Has anyone seen this issue before? > > > -marki > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
