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Posted to sci.electronics.components,sci.electronics.design,sci.electronics.repair,alt.engineering.electrical
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Diode identification?
Arfa Daily wrote: "DaveC" wrote in message news.net... Thus spake Palindr~»me: Any chance of reverse-engineering the bit of the circuit it is used in, and producing a bit of a circuit diagram? Not very good at this... just a component-test monkey (c: But it (and its partner) seems to be across a c.t. winding of the SMPS transformer. Electrolytic filter caps "downstream" from these are rated at 25v. There are a dozen more of this type of diode in this SMPS, across other trans. windings. This is a multiple-voltage ps inside a 240v ac motor controller in a Japanese printing press. Thanks, -- DaveC This is an invalid return address Please reply in the news group If it's on the secondary side, it will not be a 'normal' 1A diode. It will be a high speed Schottky type. Not necessarily Shottky actually. ( btw - is it *meant* to have a 'c' in it or not ? ) If you try to use a standard silicon rectifier diode, it will run very hot and fail, in short order. Oh I don't know. A subcontractor once fitted a 1N4004 where I'd specified a UF4004 on a lightly loaded secondary. It ran for many hours before failing ! They did it second time round too ! I reckon that purchasing looked at the part number and reckoned they could substitute. Lovely stuff working with Asians. Funny thing was, my colleagues looked glum since it was our first smps design. I ( in my infinite wisdom ! ) smelt a rat and went to it almost straight off. It was shorted. Just made the thing go into hiccup mode. Graham |
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