Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!husc6!bbn!rochester!cornell!batcomputer!braner From: braner@batcomputer.tn.cornell.edu (braner) Newsgroups: comp.sys.atari.st Subject: Re: High pitched whine -- Definite ouch! Summary: 1040s are fixable. Monitors are worse. Keywords: high resolution video Message-ID: <4783@batcomputer.tn.cornell.edu> Date: 12 May 88 18:00:09 GMT References: <468@unh.UUCP> Reply-To: braner@tcgould.tn.cornell.edu (braner) Distribution: na Organization: Cornell Theory Center, Cornell University, Ithaca NY Lines: 23 [] Over a year ago Atari informed its dealers on how to fix the problem with whining 1040ST's. It turns out that the culprit is the chip that generates the +-12V for the RS232 stuff from the main +5V supply. This chip oscillates, with the help of a capacitor, a resistor and a coil. All three should be replaced with new components of different values. I did it myself on my 1040 with success: complete disappearance of the whine. Ask your local Atari dealer for the info or a fix. (By now I have a hard disk so my ST system is noisy again :-( ) For all of you who suffer(ed) from that whine: Some people (like me) can hear the 15,750 Hz whine emitted by the ST _color_ monitor and all other standard (lo-res) monitors and TV's. It is a lot louder than that 1040 whine. It causes me physical pain. Please be considerate with your fellow people (and animals!) when using these archaic devices. Anxiously awaiting a full transition to higher-resolution video in both broadcasting and computing... - Moshe Braner (Still looking for a used 520ST system)