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| LeCroy WaveRunner 606Zi starting only every Nth try |
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| Martin72:
If it's not the battery, you could look at the outputs from the internal power supply with a scope. Whether a line sags during startup or generally has too much ripple, both of which indicate a defective capacitor. |
| tooki:
I can say with nearly 100% certainty that it’s the power supply: at work, in another department I used to work in, my former coworker has repaired 3 or 4 LeCroys with that exact problem, including his 606Zi and the 8254M on my bench. (Thats 3 or 4 out of 5 units I’m aware of.) IIRC, it’s the 5V standby rail that fails. It manifests as intermittent failure to boot, with the failure rate increasing until becomes unable to boot at all. The fix is to replace a few bulged capacitors on the PSU board. At least in the units we saw, the bulging was fairly obvious, at least compared to all the non-bulged caps on the same board. I told our LeCroy rep that I consider it very questionable that they installed cheap (Capxon, IIRC) caps on devices in this price range, where I consider it an absolutely reasonable expectation for them to use only top-quality parts. Penny pinching a few bucks of caps on a high-markup $10K+ device is ridiculous. So: --- Quote from: 0xdeadbeef on April 17, 2024, 04:17:52 pm ---Which brings me to my actual question: is this a known issue for this series and if so: can it be repaired with minimum effort? --- End quote --- Yes and absolutely. Figuring out how to gain access to the power supply board actually takes more time than replacing the caps, because of the 606Zi’s weird front panel. My former coworker said he found instructions online somewhere showing how to open it, so look for that rather than wasting time trying to figure it out yourself. |
| Kosmic:
@0xdeadbeef if you end up opening the PSU make sure you have a ESR / LCR meter at hand. Worth testing capacitors even if they physically look good. |
| 0xdeadbeef:
I just found this Chinese teardown/repair and indeed it looks like a PITA to get the power module out... https://www.sy2k.com/2018/lecroy-waverunner-610zi-teardown-repair/ And, there's this video as well: https://www.youtube.com/watch?app=desktop&v=q-bKj7J1fM4 |
| tooki:
I think the effort is worth it to prevent a multi-€10K device from landing in the trash! |
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