VCR 'sharpness' control

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Article #18352

#18352

From: Harry Lee
Date: Tue, 05 Jan 1988 17:03

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My SONY Betamax SL-HF 400 vcr has a problem on 'sharpness' control, nothing
happened on pictures' sharpness when I tried to adjust it.
It uses a potentiometer to change the dc voltage on the base or gate 
of a transistor.  When I swept the potentiometer the changing voltage
responsed fine.  But where does this control voltage go ?   How does a vcr
sharpness function work ?
Any idea, comment will be highly appreciated.

BTW, I noticed that if you shut off the Hi-Fi function you will get a better
picture from a HiFi vcr.   It is true on SL-HF 400, others ?  don't know yet.

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watmath!clyde!rutgers!super.upenn.edu!eecae!upba!unocss!hdr!harry
From: harry@hdr.UUCP (Harry Lee)
Newsgroups: sci.electronics,rec.video
Subject: VCR 'sharpness' control
Keywords: VCR Sharpness
Message-ID: <166@hdr.UUCP>
Date: 5 Jan 88 17:03:29 GMT
Organization: HDR Systems, Inc.  Omaha, NE
Lines: 11