Re: Death Race Monitor - making some progress

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I might have a BB yoke, send me a picture of yours if you can't fix the RTC
or break in winding. The RTC is a Thermister-perhaps 20 ohms when cold and
200 when hot. They often break...it is a simple fuse essentially.

John :-#)#

At 02:47 AM 13/07/2001, you wrote:
>Ok - looking at the schematics here ...
>ftp://ftp.rossiters.com/pub/ball-brothers-TG20-23.jpg
>
>Under where it says "vertical coil" - I would expect to see some continuity
>between pin 6 and 12 with a small amount of resistance because of RT1 right?
>I'm not getting any reading whatsoever. Even if I put the ohmeter on a really
>high setting. So... if this yoke is truly hosed, I don't know how I'd get it
>fixed. Would it be possible to get a replacement yoke somewhere off an old
>black and white tv? I wouldn't expect it to be anything complicated.
>
>Thanks...
>
>Matt
>
>mccullar@flash.net wrote:
>
> > >Is there anything obvious that maybe I'm overlooking? I even tried
> > >replacing the vertical deflection transistor.
> >
> > Is the vertical yoke still in one piece? See if you're getting continuity
> > between the yoke connection from the circuit board, through the yoke and
> > back. Bad solder joints are common on pins that carry a lot of current,
> > particularly yoke connections.
> >
> > If that's okay, check for open resistors. When a semiconductor shorts, it
> > often cooks a load resistor. Sometimes that's obvious: frying sounds,
> > flash, burning smell. Or the resistor may just open with no visible signs.
> > Check the resistor values (out of circuit, if possible) in the vertical
> > deflection circuit.
> >
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Received on Fri Jul 13 09:26:42 2001