Re: Wells-Gardner 19K46xx won't come up.

Matt,
Look along the edge of the main PCB, you'll probably need to remove it
first. WG used jumpers or zero ohm resistors which are notorious for
opening. This will cause the overvoltage at B+ and shut down the monitor.
 Good luck.

sm.
 
--- "Matt J. McCullar" <mccullar@flash.net> wrote:
> I just got this monitor as part of a trade and it's got a problem I'm
> sorta scratching my head over. I had a very similar problem several
> years ago and can't quite remember how I fixed it then.
>
> It's a Wells-Gardner 19K46xx-series monitor. This one has the plug-in
> boards that connect to the main PCB. The problem with this is, it won't
> start up. No high voltage, no deflection, etc. The B+ line is much
> higher than it should be... say about 165 volts, instead of 127 volts.
>
> The power-regulator board doesn't appear to have any shorted or open
> transistors on it, but I'm wondering about a little thermistor called
> TH501. I seem to recall that if this thing gets too high in resistance,
> it will cause the power regulator to make the B+ go too high, which
> causes the horizontal-drive circuitry to shut off.
>
> Has anyone else run into something similar? What should I look for?
> Open resistor elsewhere in the monitor? Bad flyback? Bad thermistor?
>
> Thanks!!!! I'm dying to get this monitor up and running.
>

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Received on Tue Sep 26 09:29:01 2000