Re: Death Race Monitor - making some progress

Here's some photos of the yoke. I'm guessing the thermistor is tucked under the
wiring or was removed because I don't see it anywhere. Is anyone else familiar
with this yoke? The tube is a b&w Sylvania 22VATP4. Sorry the images aren't
perfectly clear.

ftp://ftp.rossiters.com/pub/bb-yoke1.jpg - this is the inside
ftp://ftp.rossiters.com/pub/bb-yoke2.jpg
ftp://ftp.rossiters.com/pub/bb-yoke3.jpg
ftp://ftp.rossiters.com/pub/bb-yoke4.jpg - continuity good on horizontal windings -
continuity bad on vertical
ftp://ftp.rossiters.com/pub/bb-yoke5.jpg

Thanks for everyone's help.

Matt

John Robertson wrote:

> 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.
> > >
> > > ---------------------------------------------------------------------------
> > > ** To UNSUBSCRIBE from rasterlist, send a message with "UNSUBSCRIBE" in the
> > > ** message body to rasterlist-request@synthcom.com. Please direct other
> > > ** questions, comments, or problems to neil@synthcom.com.
> >
> >---------------------------------------------------------------------------
> >** To UNSUBSCRIBE from rasterlist, send a message with "UNSUBSCRIBE" in the
> >** message body to rasterlist-request@synthcom.com. Please direct other
> >** questions, comments, or problems to neil@synthcom.com.
>
> ---------------------------------------------------------------------------
> ** To UNSUBSCRIBE from rasterlist, send a message with "UNSUBSCRIBE" in the
> ** message body to rasterlist-request@synthcom.com. Please direct other
> ** questions, comments, or problems to neil@synthcom.com.

---------------------------------------------------------------------------
** To UNSUBSCRIBE from rasterlist, send a message with "UNSUBSCRIBE" in the
** message body to rasterlist-request@synthcom.com. Please direct other
** questions, comments, or problems to neil@synthcom.com.
Received on Fri Jul 13 10:42:15 2001