Re: Astec AA16990 PSU failure
Worth trying anyways. Save the old cap, though, in case it is still good. I see a few more small caps, though - one near that daughterboard on the secondary side and two more on the primary side.
Yup.
TL431, KA431, and AS431 are all the same thing, just made by different manufacturers. It's the "431" in the name that designates it's an adjustable shunt.
Same goes for your AS3842 PWM controller - it's an equivalent to a UC3842.
Another point I forgot to mention: are there any potentiometers or variable resistors anywhere in the PSU? Sometimes, those are used for fine-tuning output voltage regulation. Pots are a lot more susceptible to damage from moisture and dust, so if your PSU has one, check it.
Originally posted by powermax
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Originally posted by powermax
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TL431, KA431, and AS431 are all the same thing, just made by different manufacturers. It's the "431" in the name that designates it's an adjustable shunt.
Same goes for your AS3842 PWM controller - it's an equivalent to a UC3842.
Another point I forgot to mention: are there any potentiometers or variable resistors anywhere in the PSU? Sometimes, those are used for fine-tuning output voltage regulation. Pots are a lot more susceptible to damage from moisture and dust, so if your PSU has one, check it.
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