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  |