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| Keysight 3000 4000 MSOX4154A P-CLOCK failure |
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| EE-digger:
Christmas morning findings ... Santa left a tiny, super quiet Harbor Freight compressor under the tree. The sound level of these things is unreal. Could have saved 30 years of canned air purchases and resided in the electronics lab. New observations and updated theory on scope... With scope sitting on my bench, left vents toward a "leaky" window so somewhat cooler at that end, failed 100%, all day yesterday. On my lap, exhaust against my leg, left and right vents blocked by my hands, passed after about 3 minutes of warming :) Now, Christmas morning, fails on power-up and when warmed BUT, after 5 minutes of LEFT vents covered in tape, unit passes and continues to pass for several hours so far. :) :) SMPS areas are no longer bathed in cooler air that's pulled in. This is now a steady state condition in that the SMPS areas are warmer, not ramping (which could have pointed to a connection). I thought this was the crystal oscillator end but looking at Dave's teardown, this end is all SMPS circuits on both sides of board. This also makes me very happy because mothers of BGA packages may not be involved :) So now, I'm leaning or at least open to the possibility that there may be a power supply problem. Why, why, oh why, can't an instrument in this price range give a complete dump of system status and supply voltages ? :bullshit: :bullshit: :bullshit: So while I wait for comment from Keysight, I'm holding out hope for a simple solution for the New Year ! |
| electr_peter:
Agilent/Keysight DSOX2000A, MSOX2000A, DSOX3000A, MSOX3000A (possibly DSOX3000T and MSOX3000T) had issues with internal SMPS. Based on your experience, SMPS issue remains :( Forum topic dso-x-3024a-power-supply-defect |
| EE-digger:
I don't think the problem is with the main supply (at least not yet). But thanks for the link as it's a real eye-opener for the 3000 series, along with good alternative solutions. |
| JacobPilsen:
--- Quote from: EE-digger on December 25, 2021, 05:28:46 pm ---there may be a power supply problem. --- End quote --- Have you made any progress??? |
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