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 ). 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

Chris Starr wrote:

> A scope would definitely tell you if the vector board is sending good signal
> to the deflection circuit in the monitor.
> Anyone else have any good simple suggestions to make sure the vector
> generator board is sending signal ok?
>
> I'm still leaning toward the output transistors. Are you positive they are
> good? Make sure that you have infinite resistance between the transistors
> and the chassis -- disconnect the jumpers from the board and do a diode
> check to check the transistor, and also a continuity check between the
> transistor case and the chassis. It should read open.
>
> Also - what is the low voltage reading?
>
> chris starr
>
> ----- Original Message -----
> From: "Daniel Piraino" <dpiraino@twcny.rr.com>
> To: <vectorlist@synthcom.com>
> Sent: Friday, October 05, 2001 2:41 AM
> Subject: Re: VECTOR: Amplifone DEFLECTION QUESTION
>
> > I never had this problem before until I blew some power transistors. I
> dont
> > believe its the yoke it worked fine before all that. I dont have access to
> a
> > scope so cant check with that.
> > Dan Piraino
> >
> > Chris Starr wrote:
> >
> > > A yoke problem perhaps? But that's worst case.
> > > What does the signal look like for the video board on an oscilloscope?
> > >
> > > sorry - an oscilloscope that does x/y input.
> > >
> > > ----- Original Message -----
> > > From: "Daniel Piraino" <dpiraino@twcny.rr.com>
> > > To: <vectorlist@synthcom.com>
> > > Sent: Friday, October 05, 2001 12:22 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 Sat Oct 6 16:38:47 2001