Electronics > Beginners
Power Supply Repair
cdev:
Those caps sound okay to me. Their ESR is getting very low at the higher frequency.
The DE-5000 is the best meter of its kind for under 4 times the price.
Other people with more experience should weigh in but those capacitors sound to me to be not unlikely to have still been okay.
patrickoneal:
I've already replaced them and now the machine works fine. That's why I'm confused about the apparent good readings on all of them.
tautech:
--- Quote from: patrickoneal on December 04, 2018, 02:05:27 am ---I've already replaced them and now the machine works fine. That's why I'm confused about the apparent good readings on all of them.
--- End quote ---
Except these two:
Cap 4: 47µf 63V measured at 10kHz: 43.9µf 0.53 ohms
Cap 5: 33µf 63V measured at 10kHz: 27.7µf 0.80 ohms.....particularly this one.
They're related to proper operation of the SMPS and probably both across the Vcc of the controller circuitry.
If they're not right it won't kick off.
bitseeker:
I've heard of caps that, despite seeming to be OK, would not work properly in a particular circuit. It could be that they were leaky or some other characteristic besides capacitance and ESR affected their behavior. It's also possible there was a bad solder joint, as you said.
nickeevblog10:
Not sure I have an idea here or not about the readings on meters for components when testing but, what may be a reason the op got multimeter readings that did not seem to be correct is perhaps because unless the meter is turned off after taking a reading and then turned back on before a second reading is taken the second reading may not appear to be correct because of stored power in the meter measuring process.
My UTI-61E automatically OL's but my first digital multi meter (NZ$20) seemed to not read consistently correctly and this seemed to be the reason I should get the new UTI-61E meter.
After I realized the Uni-T would OL automatically after each reading I began to use my $20 digital multi meter again but this time around turning it off after a single reading and readings came back to expected levels.
Lesson learned.
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