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Old 5th Jun 2019, 11:22 pm   #17
Pamphonica
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Join Date: Mar 2008
Location: Virginia Water, Surrey, UK.
Posts: 1,685
Default Re: Marconi 2024 not powering up

For longer-term reliability I would replace all the electrolytics in the power supply if it's currently "on the bench". The localised heat in those switchmode power supplies dries the caps out and shortens their lives.
I have found that caps from reputable suppliers (RS, Farnell etc) rated at 105 degrees C seem to work very well. All have good low ESRs.
I have even had to replace 6 surface-mount tantalums recently on a single-board 500MHz oscilloscope (Tektronix) to get it working agains. Caps, caps, caps....!
The Marconi 2024/2025 sig-gens are actually very good workhorses, as the military found out. They bought them in large numbers.
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