Electronics > Repair
DSO-X 3024A Power Supply defect
DEHiCKA:
Follow up on the repair.
The main 100uF/420V cap has degraded down to 9uF.
The PSU control board was also fried, so I did not bother to repair it.
Exchanged PSU for Meanwell RPS-400. Works fine now.
I'm glad the cirquit breaker was only 16A / 220V, not 32A or 40A!
HighVoltage:
Congratulations on the successful repair.
Nice that we can buy fitting power supplies for these scopes.
frabre:
Hi DEHiCKA,
I have the same problem of power supply.
I tried to repair but...
Which model of RPS-400: RPS-400-12 or RPS-400-12-C ?
If 400-12: no problem of shielding ?
If 400-12-C: no problem of height ?
Thanks in advance...
DEHiCKA:
Hi, frabre
I have the cheapest RPS-400-12 without cage.
No problem with the shielding, it has a slight audible noise, but otherwise working just fine.
In/Out terminals are differ from original though, so you have to make some kinda adapter.
Madmanguruman:
Just chiming in about shielded vs. unshielded 3x5 power supplies. I recently replaced the same PSU from a DSOX3014A scope with a Murata PQC250-12 and a bit of Mylar to create some creepage between the cable bundles and power supply itself. So far so good, no discernable pick-up or noise issue. I would argue that if you are replacing with a non-caged PSU that you should carefully dress the cables to keep them away from hotspots or from touching any primary-side parts - this is why I added some Mylar under the cable assemblies as they cross the power supply.
Also, to sanity-check the scope before you get a new power supply, you can remove the PSU and connect a 12VDC 10A lab supply directly to the 12V rail (no need for enable or remote sense) - the scope will power-up and operate without these signals. My scope was drawing between 5.5 and 6.5A with a single scope probe connected and the scope capturing data.
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