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Stunning 3000A, 2000A, 3000T power supply discovery - MUST READ IF YOU HAVE ONE
EE-digger:
Reply #53 in this thread may be of interest to you: https://www.eevblog.com/forum/repair/dso-x-3024a-power-supply-defect/50/
At 400k+ ohms, the startup voltage was 135 volts. Perhaps not an issue for you but would be on 120v mains.
EE-digger:
Another happy camper with a Murata PQC250-12 installed.
It took a few resistor moves to invert the remote on/off signal and it took a bit more doing to get rid of very annoying acoustic noise whether on or off.
Spoke with Murata and one of the posters and no one has had this problem. I had it on the two supplies I tried.
It comes down mostly to one capacitor (ceramic, 10uF) that sounds like a dentist drill if you gently touch the top with tweezers. My solution was to replace it with a Murata metal mounted cap of same value. You can also get interposer caps. I first made my own interposer before the Muratas arrived by simply mounting the cap piggyback on a 1 Mohm 1206 resistor. I have to say that this was quite good.
If anyone want the on/off inversion info, I'll post it.
Helix70:
--- Quote from: EE-digger on February 10, 2024, 03:00:18 pm ---Another happy camper with a Murata PQC250-12 installed.
It took a few resistor moves to invert the remote on/off signal and it took a bit more doing to get rid of very annoying acoustic noise whether on or off.
Spoke with Murata and one of the posters and no one has had this problem. I had it on the two supplies I tried.
It comes down mostly to one capacitor (ceramic, 10uF) that sounds like a dentist drill if you gently touch the top with tweezers. My solution was to replace it with a Murata metal mounted cap of same value. You can also get interposer caps. I first made my own interposer before the Muratas arrived by simply mounting the cap piggyback on a 1 Mohm 1206 resistor. I have to say that this was quite good.
If anyone want the on/off inversion info, I'll post it.
--- End quote ---
Yes please, my MSOX3014T (early model) power supply just died (GE CCH0125F1-Z03A) and am researching the best replacement options. Having the correct switch position is important to me as it is a work scope and I don't want the risk assessment!
djsb:
I have a Keysight MSO-X3054A. Is this scope affected by this and what should i be looking to replace in the power supply and with what? Thanks.
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