Re: Amplifone DEFLECTION QUESTION

> What should the x and y output voltages read and where is the best place
to read
> them . I tried to read them at the orange and yellow wires and got
readings that
> were below 0. (Ex. 0.6 and 0.2 vdc ).

X and Y signals can swing between -8v and +8v or thereabouts..

If you're measuring these with a multimeter set on DC, you're going to see
some funky things, and nothing that you are going to be able to make
comparisons by.

Even if your meter is set on AC, what you see will not be representative of
anything because this depends on what is being displayed, and how.
Multimeters display an average of what they are metering... because the AC
signal is swinging about like mad one, its not going to help you.

You really want to get an oscilloscope and check the signals properly, there
isn't really an easy alternative way to do it... accurately.

I use a Vectrex and an oscilloscope in combination, as a scope is invaluable
for tracing other problems in the AVG section, and is too precious to tie up
displaying the image (if at all :) Or you could get 2 scopes i suppose :)

> I have replaced all the 2N3904's in the x
> section.
> Could I still be having a problem with the power transistors or the medium
power
> transistors thats making the picture come out distorted like it is.? Could
it be
> a bad diode or resistor even.?
> Dan Piraino

Andy

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Received on Sat Oct 6 17:13:24 2001