| Electronics > Repair |
| DSO-X 3024A Power Supply defect |
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| 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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