870646c@aucs.UUCP (Barry Comer) (04/09/89)
Has there been a problem with the 1084 monitors making a high pitch noise until they warm up(for about 3 mins after starting up)? And if so what can be done to fix it? Later Barry Comer 870646c@aucs.UUCP
840445m@aucs.UUCP (Mic Mac) (04/11/89)
In article <1763@aucs.UUCP> 870646c@aucs.UUCP (Barry Comer) writes: >Has there been a problem with the 1084 monitors making a high pitch noise >until they warm up(for about 3 mins after starting up)? And if so what can >be done to fix it? > Consider yourself lucky. My monitor does this all the time. (1080 monitor). Come to think of it, don't all monitors do this to some extent? -- % Alan W. McKay % % % Acadia University % " The world needs more Socrates % % Wolfville N.S. % walking the streets today " % % CANADA % - S. Corbett %
beh@caen.engin.umich.edu (Bob Hruska) (04/11/89)
From article <1763@aucs.UUCP>, by 870646c@aucs.UUCP (Barry Comer): > Has there been a problem with the 1084 monitors making a high pitch noise > until they warm up(for about 3 mins after starting up)? And if so what can > be done to fix it? > > Later > Barry Comer 870646c@aucs.UUCP I've been getting the exact same high pitch - only it occurs intermitently the whole time the monitor is on. I'm also looking for a fix. -- Bob Hruska University of Michigan Computer Aided Engineering Network (CAEN) INTERNET: beh@caen.engin.umich.edu UUCP: {umix|ucbvax|uunet}!caen.engin.umich.edu!beh
sean@ms.uky.edu (Sean Casey) (04/12/89)
It's the flyback transformer oscillating at a near ultrasonic frequency.
A lot of them tend to do this after a while, I believe that something on
the inside gets the tiniest bit loose.
My solution is to whack the terminal on the side. I don't recommend
you to it to yours.
Sean
--
*** Sean Casey sean@ms.uky.edu, sean@ukma.bitnet
*** What, me worry? {backbone|rutgers|uunet}!ukma!sean
*** ``A computer network should be considerably faster than a slug.'' -Mebah@tippy.uucp (04/12/89)
The high pitched sound (usually intermittant) that you hear is usually
caused by the pincushion transformer vibrating. Replacing it generally
is the only way to stop it. It's a small transformer in the horizontal
sweep section, and costs' about $8.00.
Bob Hahn tippy!bah@newton.physics.purdue.edustan@teroach.UUCP (Stan Fisher) (04/12/89)
In article <11474@s.ms.uky.edu> sean@ms.uky.edu (Sean Casey) writes: >It's the flyback transformer oscillating at a near ultrasonic frequency. >A lot of them tend to do this after a while, I believe that something on >the inside gets the tiniest bit loose. > >My solution is to whack the terminal on the side. I don't recommend >you to it to yours. Back.. wayyyyyy baaack when ;') I used to work on T.V.'s and electrostatic copiers etc. Anything that squealed (like flybacks, coils etc.) we just drooled some super-glue down into the windings, if they were exposed (alot of flybacks are sealed up) and let it dry good before turning it on again (oh yeah, turn it off first). Of course try tightening down any mounting hardware first. The glue would hold those little vibrating windings solid and... no more squeal!!! DISCLAIMER: If you try this, and it trashes your monitor, don't flame me ! All I know is, it worked wayyyyyy baaack when 8^) - Stan Fisher asuvax!mcdphx!teroach!stan Motorola Microcomputer Division, Tempe, Arizona - (602) 438-3228
ranjit@eniac.seas.upenn.edu (Ranjit Bhatnagar) (04/13/89)
>Back.. wayyyyyy baaack when ;') I used to work on T.V.'s and >electrostatic copiers etc. Anything that squealed (like flybacks, >coils etc.) we just drooled some super-glue down into the windings, >if they were exposed (alot of flybacks are sealed up) and let it dry >good before turning it on again (oh yeah, turn it off first). Of >course try tightening down any mounting hardware first. The glue would >hold those little vibrating windings solid and... no more squeal!!! Yow! Test it on some scrap of wire first - if you pick the wrong glue, the solvent will take the lacquer off the wire, and that would be bad. Superglue probably wouldn't, but who knows... Speaking of 1084's, if I wanted to replace the COMP-CHROMA-RGB switch with an electronic switch of some sort (I use my 1084 for watching TV, and I'm worried about wearing out that big clunky mechanical switch), what kind of switch do I need? Something shielded? Something with high power capacity? Something guaranteed to break-before-make contact? A nice relay, a couple of FET's, or what? -- ranjit "Trespassers w" ranjit@eniac.seas.upenn.edu mailrus!eecae!netnews!eniac!... I'd be calling all the hotlines/I'd be missing all my deadlines I'd be standing in the breadlines/I'd be six feet underground