Xref: utzoo comp.sys.3b1:1278 comp.sys.att:12239
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!rutgers!tut.cis.ohio-state.edu!VAX1.CC.UAKRON.EDU!neoucom.edu!wtm
From: wtm@uhura.neoucom.EDU (Bill Mayhew)
Newsgroups: comp.sys.3b1,comp.sys.att
Subject: Re: External 3B1 Monitor Project Status; and help needed
Message-ID: <1991May05.153912.9311@uhura.neoucom.EDU>
Date: 5 May 91 15:39:12 GMT
References: <38657@cup.portal.com>
Organization: Northeastern Ohio Universities College of Medicine
Lines: 32

Horizontal width is virtually always controlled by an inductor, not
a pot.  Check in the vicinity of the flyback transformer.  There
should be a cardboard tube about 10mm in diamter and 30-40 mm in
length with a large bolus of litz wire near the top.  The width is
controlled by moving a powdered iron slug up and down inside the
tube (hence changing the reluctance of the coil).  Adjustment is
accomplished via a plastic hex wrench.

The coil should have a profile something like this:

                    _
                 __| |__
                 |     |  <- coil
                 |     |
                 --| |--
                   | |  <- cardboard tube
                   | |
                  _|_|_       <-  circuit board


As far as delaying the video.  Hmmm.  I don't know.  Perhaps the
width adjustment will take care of that?..


Bill


-- 
Bill Mayhew      NEOUCOM Computer Services Department
Rootstown, OH  44272-9995  USA    phone: 216-325-2511
wtm@uhura.neoucom.edu   ....!uunet!aablue!neoucom!wtm
via internet: (140.220.001.001)