To everyone who replied to my problem, Thank you for everyone's input. I got a great link from A.P. for me to catch up on my reading on switch mode power supplies. I would like to answer Day's question though ... >Since I am involved in the design of dc input pc power supplies, >I look for >anything I can find on SMPS or even linears. but since >replacements are out >in the market at 15$ for an AC PC power supply, why would anyone >want to >repair it? Is this some kind of oddball motherboard? I work in a manufacturing plant and have replaced several machines' power supplies. I have 2 power supplies from separate industrial inkjet coding machines (wherein a replacement power supply costed over US$1,000 each) and a power supply from a CNC machine (replacement power supply costed over US$2,000). Its such a ripoff paying high prices for proprietary equipment but I gotta pay it if I want my machines to run. I noticed that in principle the power supply boxes work the same way as the computer power supply. For my coding machine, its similar except an additional 24 volt output (high ampere) is needed which runs a small pump. For the CNC machine, its identical to a computer power supply except its physical dimensions are rectangular instead of the cube sized ps boxes found in computers. Hope that clarifies why I have to repair them. Oh what joy if I could repair them! It would suck if I had to replace another one. Come to think about it ... I think this is off topic. Sorry! regards ... Oliver To unsubscribe from SURVPC send a message to [EMAIL PROTECTED] with unsubscribe SURVPC in the body of the message. Also, trim this footer from any quoted replies. More info can be found at; http://www.softcon.com/archives/SURVPC.html
