Re: Amplifone DEFLECTION QUESTION

The picture is not being drawn in quarters. I know what you mean by that, its
happened to me before. In this case the picture is being distorted. Here is a
diagram to explain. Its like the left top corner was pulled into the center of
the screen taking the rest of the picture with it and distorting it.
                                        top
                          no | ' |
                          picture ' |
                                | ' |
                                | ' picture
                                | ' |
                                | ' |
                                      bottom
thanks,
Dan Piraino

Tek wrote: '

> In almost all cases, when the vectors are only drawn in a certain quarter of
> it, the amps are probably good but there is one supply voltage gone. The X
> and Y amps need a + voltage to move to one side, and a - voltage to move the
> beam to the other side. so when only one of the two supplies is available,
> everything gets drawn in one particular quarter because there is only one
> quarter in the monitor where only ont type of supply is needed:
>
> for example, if the monitor uses a positive voltage to move the beam up and
> right, that is the only quater of the screen that would work if there is no
> negative supply:
>
> -+ | ++
> |
> -----------
> |
> -- | --
>
> I don't have an amplifone :( (Need one for my Star Wars) so I am not sure if
> this is as the screen is layed out on that type of monitor but you get the
> idea. Check the positive and negative supplies, preferrably at the power
> transistors.
>
> Mendel
>
> ----- Original Message -----
> From: Daniel Piraino <dpiraino@twcny.rr.com>
> To: <vectorlist@synthcom.com>
> Sent: Friday, October 05, 2001 6:22 AM
> Subject: VECTOR: Amplifone DEFLECTION QUESTION
>
> >
> > I have been working on an Amplifone board that I have gotten to the point
> of running
> > without blowing transistors. I found the culprit and fixed it but there is
> a problem
> > im not sure of. The screen is sqewd. To explain what it looks like it
> would be like
> > if you took the top left corner of the screen and pulled it to the middle
> of the
> > screen. Nothing is draw to the top of the screen or to the left side of
> the screen.
> > Everything is being drawn to the bottom right of the screen. I was
> wondering if it
> > could be a capacitor that went bad. I havent checked them yet but I will.
> If you
> > understand what Im saying and have an idea let me know.
> > Thanks,
> > Dan Piraino
> >
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Received on Fri Oct 5 12:06:22 2001