Path: utzoo!utgpu!attcan!uunet!lll-winken!lll-tis!ames!haven!umd5!uvaarpa!mcnc!rti!sunpix!matthew From: matthew@sunpix.UUCP ( Sun NCAA) Newsgroups: comp.sys.mac Subject: Re: crash and burn!!! Why no fuse? Message-ID: <224@greens.UUCP> Date: 19 Aug 88 14:55:40 GMT References: <870209@hpcilzb.HP.COM> Organization: Sun Microsystems, Research Triangle Park, NC Lines: 22 In article <870209@hpcilzb.HP.COM>, tedj@hpcilzb.HP.COM (Ted Johnson) writes: > > I came in to work Fri. to see my Unix box belly-up. The power outlet > had shorted together and was now putting out 204v instead of 120V [stuuf deleted] > But it makes me wonder..., WHY DOESN'T MY SE HAVE A FUSE????? > Seems like the $.50 that a fuse costs would be worth it! > Maybe someone at Apple can answer this...? All Apple Computers use a switching power supply which has a natural feature of shutting down the internal power supply oscillator if the "OUTPUT" should become shorted, there-by stopping power transfer across the small transformer. This is all that is required by UL, and makes the machine much more reliable since it doesn't contain a fuse, which could fail (come on now, how may times have you replaced a fuse, Just because it blew?). -- Matthew Lee Stier (919) 469-8300| Sun Microsystems --- RTP, NC 27560| "Wisconsin Escapee" uucp: {medusa, rti}!sunpix!matthew |