RE: Tron Monitor - Some Life

James,

Have you replaced the electrolitic capacitors (cap kit) yet ? That should be
the first step.

Breno

>From: "James McGovern" <James@retroblast.com>
>Reply-To: rasterlist@vectorlist.org
>To: <rasterlist@vectorlist.org>
>Subject: RASTER: Tron Monitor - Some Life
>Date: Thu, 17 Mar 2005 00:19:31 -0500
>
>A step in the right direction tonight. I resoldered a few of the jumper
>wires on the 130VDC trace along the front edge of the PCB. I now have a
>picture of sorts on screen wheras before I had nothing.
>
>Current issues are:
>
>1. REALLY bad horizontal (vertical for tron) tearing (or is it bleeding?)
>,
>nearly 2 inches long.
>
>2. It appears I have three images on screen, or the picture is rolling so
>much I am getting an animation, picket fence effect and seeing three
>images.
>
>3. Was not quite able to get the image to stabilize vertically (that is
>really horizontally for Tron, but vertically as the monitor sits now)
>
>Anyone have any ideas on any one or more of the three issues? Pics here:
>http://forum.arcadecontrols.com/index.php/topic,33450.msg291163.html#msg291163
>
>
>
>
>----- Original Message -----
>From: "James McGovern" <James@RetroBlast.com>
>To: <rasterlist@vectorlist.org>
>Sent: Wednesday, March 16, 2005 8:49 PM
>Subject: Re: RASTER: No picture on k4900 - dumb VOM question
>
>
> > So next steps and results are:
> >
> > - Examine the jumper wire J33 as well as other jumper wires on the
>130VDC
> > trace. (Done and look visually intact and ok)
> >
> > - Inspect chassis for bad solders and or hairline cracks in pcb, (done
>and
> > looks ok, have not resoldered anything yet. )
> >
> > Measure voltage at the metal case of Q352, the transistor on the side of
>the
> > chassis closest to the HV unit.
> >
> > Question: I am a bit confused by the statement, "Measure the voltage at
>the
> > metal case." Does this mean that my red lead will go on the metal
>housing
> > on the outside of the chassis with the COM lead to the chassis frame?
> >
> > Is it that white compound that unsulates the frame from the metal case?
> >
> > In the pic below you can see the transistor, Q352 in the yellow box to
>the
> > right.
> >
> >
> > pic is here:
> >
>http://forum.arcadecontrols.com/index.php/topic,33450.msg290847.html#msg290847
> >
> >
> >
> > ----- Original Message -----
> > From: "James McGovern" <James@RetroBlast.com>
> > To: <rasterlist@vectorlist.org>
> > Sent: Monday, March 14, 2005 1:45 PM
> > Subject: RASTER: No picture on k4900 - dumb VOM question
> >
> >
> > > I had a little time to look through the k4900 manual and flowchart.
>One
> > of
> > > the first items to test according to the flowchart is:
> > >
> > > "Check the regulated power supply at resistor r503...terminal closest
>to
> > the
> > > fuse should read +130vdc"
> > >
> > > So my question is, I am assuming that I place the red test lead on my
>VOM
> > on
> > > the r503 terminal closest to the fuse as directed...where though do I
> > place
> > > the common lead?
> > >
> > > You can see the flowchart and the manual here (
> > > http://home.earthlink.net/~rescuetron/ ) in today's post or in the
> > > "Pictures and Documents" section in the sidebar.
> > >
> >
> >
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> > >
> > >
> >
> >
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> >
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Received on Thu Mar 17 07:44:10 2005