F
Francisco
Guest
Well, first off. I'm almost an electronics engineer so no problems with
circuits but I never dealt with TV's. Now I have some idea because I've
been touching and fixing little things.
But there is something that I can't find any solution. The horizontal size
of the screen is too big. The yoke is on the output (Colector) of a
transistor (BU206D), there are (in this order) 2 capacitors an inductor
named 'linearity' in parallel to a resistor, the yoke and another inductor
wich you can regulate by moving a cilindrical ferrite nucleus, then gnd.
At home I don't have much instruments to measure anything working, but I
looked at the schematic and I think that all the parts are ok, at least I
can't find what could be wrong.
The variable inductor does reduce a little the horizontal size, but it's
still insuficient, the image is way larger than it should be. Another thing
I discover is that moving a potenciometer near the power supply, the image
gets smaller, but looses linearity at the right, I guess that whats
happening here is that the transistor starts to cut the signal, and thats
why I see that alinearity, correct me if I'm wrong.
I can't find a sollution to this, at least not something that is broken,
could it be just a bad design?, I was thinking about a solution, maybe to
make a larger variable inductor and replace the current one, to reduce
voltage at the yoke, but I'm just guessing.
Well if you can tell me something about this I would be very pleased to here
it. If you need more info just ask.
Thank you.
Francisco
circuits but I never dealt with TV's. Now I have some idea because I've
been touching and fixing little things.
But there is something that I can't find any solution. The horizontal size
of the screen is too big. The yoke is on the output (Colector) of a
transistor (BU206D), there are (in this order) 2 capacitors an inductor
named 'linearity' in parallel to a resistor, the yoke and another inductor
wich you can regulate by moving a cilindrical ferrite nucleus, then gnd.
At home I don't have much instruments to measure anything working, but I
looked at the schematic and I think that all the parts are ok, at least I
can't find what could be wrong.
The variable inductor does reduce a little the horizontal size, but it's
still insuficient, the image is way larger than it should be. Another thing
I discover is that moving a potenciometer near the power supply, the image
gets smaller, but looses linearity at the right, I guess that whats
happening here is that the transistor starts to cut the signal, and thats
why I see that alinearity, correct me if I'm wrong.
I can't find a sollution to this, at least not something that is broken,
could it be just a bad design?, I was thinking about a solution, maybe to
make a larger variable inductor and replace the current one, to reduce
voltage at the yoke, but I'm just guessing.
Well if you can tell me something about this I would be very pleased to here
it. If you need more info just ask.
Thank you.
Francisco