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Old 12th Aug 2018, 5:09 pm   #38
mole42uk
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Join Date: Aug 2010
Location: Resolfen, Wales; and Bristol, England
Posts: 2,588
Default Re: Gould 4072 bad PSU

Now I have been running the 'scope again, increasing the AC input to 160V and the PSU heatsinks remain slightly warm with the fan running. I did smell something getting hot though, and switched off after about 20 minutes. The heatsinks on the CCD board were very hot.

I did get a signal display on the screen and upon pressing the Auto Setup button the 'scope tried to present a useful display. I was attempting to provide an input when I decided to switch off to investigate the hot smell.

I'm not sure what the devices are on the CCD board and why they might be getting hot. I just read in the service manual that "the aquisition clock cable from the Digital Timebase must be connected while the instrument is switched on. Operation for extended periods of time without this connected could lead to excessive heat dissipation..." I must check!
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