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Author
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Topic: Boy, was I incredibly stupid!
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Osi Osgood
Film God
Posts: 10204
From: Mountian Home, ID.
Registered: Jul 2005
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posted May 08, 2017 11:28 AM
OK, I might be beaing just a little harsh on myself, but I'm suprised that I never realized, or discovered this before ...
I have had an ailing CHINON 9500 projector. Ailing, because it's had a terrible "sqeal-ly" sound, you turn up the volume and you get this incredibly high pitched (makes dog's cry in pain) screech. I tried and tried to figure this out.
Then, the other day, I was adjusting the "knobs" on the "motherboard" of the projector, (where all the transistors and such are), you know, the little knobs to adjust the speed of the projector, and being that I had the front cover off, and to get a better view of the knobs, I accidentally placed one of my hands underneath the projector, where there is a long metal "sheet" (the best way i can put it), which covers the whole bottom of the motherboard, and I guess it's supposed to keep the solders from touching anything else.
But the strange thing was that when my fingers pressed up on that metal "sheet, the audio screech completely left, leaving crystal clean sudio!
So, after doing my adjusting, I put the projector on it's back and found that one of the little screws that keeps it in place was a little loose. I tightened the screw and voila! The screech is completely gone.
I mean, I suffered for months with that screech and the thought that all it took was tightening an insignificant screw, is really embarrassing in a way, but I am so relieved.
So now, for all you projector repairmen (and women) on this forum, exactly why did this simple repair fix the problem? Does that long piece of thin metal, serve as some kind of "ground" for the projector or what?
I'd certainly like to know!
![[Smile]](smile.gif)
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"All these moments will be lost in time, just like ... tears, in the rain. "
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