Re: Flyback Troubleshooting help

Rodger Boots wrote:
>
> John, it's a raster monitor, not vector.
>
> So why is it ringing in the first place? Is the damper diode
> connected? Is the horizonal output transistor the correct part? Is
> the correct yoke winding connected? Is the filter capacitor on the
> power supply to the output transformer working (should be DC to the
> transformer, very little AC).
>
Hi Rodger,

The ring test works for the transformer used in vectors as much as in
flybacks used in raster monitors. You are applying a known signal to a
transformer and checking the output levels...

The ring test is a check to see if the high frequency transformer
(flyback in rasters) dampens too quickly - a ring of 5 to 7 times (or
more) indicates a transformer that is unlikely to have any shorted
windings. Damping diodes (usually in the HOT) are used to suppress the
ring of course...

John :-#)#

-- 
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Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
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