I think 61°C might be more typical, so 76°C seems pretty darn hot to me. I would make sure that your fan is running, and is mounted the right direction. (It should be blowing *into* the instrument.)
Also make sure that the top instrument cover is installed. (The top cover must be in place so that the internal fan air currents will loop around and pass through vents, including the through-holes in the rear heat sink.) Greg ----- Original Message ----- From: "gonzo ." <cadbl...@hotmail.com> To: "time-nuts" <time-nuts@febo.com> Sent: Monday, February 07, 2011 9:28 AM Subject: [time-nuts] HP 5370A temp Hi all, I just picked up an irresistibly cheap 5370A (so cheap I didn't ask if it worked). So far it checks out ok, but I have some questions for those of you more familiar with this model. 1) The back panel heatsink (4x TO3) is sitting on 76°C (168°F). - is this normal? 2) Several resistors and diodes on the A6 Power Supply Controller show sign of excessive heat (specifically: CR1, R1 & R23). All the A6 voltage rails are within 0.2V. - Is this a normal sign of age or should I be looking for something that's NQR? Judging by the stickers, it's probably spent it's entire life with the side panels on the wrong sides.This may help explain the overheated components. cheers, ian _______________________________________________ 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.