Re: Flyback Troubleshooting help

No, you're not going to have a sawtooth in the mode you're running in. And
the ring is fine for the mode you're in.
On Jan 17, 2011 1:39 PM, "Jess Askey" <jess@askey.org> wrote:
> Im going to go put a low value resistor in series with the horizontal
> deflection coil so I can scope the voltage and see the current going
> through the deflection coil (an inductor) and I *should* have a sawtooth
> (or at least a trapezoid) there. After thinking about the ringing point
> that Rodger made, I don't think my statement made any sense as I
> wouldn't see a sawtooth from ground to HOT collector. However, I should
> see a sawtooth voltage across any resistive element in series with the
> H.Deflection coil. Reading directly across the H.Deflection woudn't work
> because it is an inductive load and the voltage is not representative of
> the current and the real thing that has to be a perfect sawtooth is the
> current through the H.Deflection coil.
>
> On 1/17/2011 12:08 PM, Jess Askey wrote:
>> That *is* a good question... why is it ringing? The LOPT primary is
>> also on the horizontal deflection coil so it should be a nice solid
>> sawtooth for correct deflection.... maybe I have a bad retrace or
>> deflection capacitor?
>>
>> The damper diode is connected and tested good. HOT is tested and
>> good... correct part. Yoke is connected and is the correct yoke. I put
>> a similar raster yoke on it just for fun and behavior is the same.
>>
>> The filter cap is good (new) on the 120V B+ to the HOT and LOPT. If I
>> scope the 120V (im running this at 36V) supply, it is actually quite
>> stable with negligible noise.
>>
>> On 1/17/2011 12:56 AM, 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).
>>>
>>
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>
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Received on Mon Jan 17 15:04:38 2011