Re: A bad day in My arcade (V2000 help)

> Hooking up Z to the scope changes nothing.... I still see all the
> retrace line like if I didn't hook it up

well then.. if you have X tied to x on your scope, likewise with Y and Z and
your scope still shows the retrace lines then you have no Z..

the very quickest/simplest way of doign this is to just trace the Z on one
of the normal channels, set at about 1ms/div if you don't get a trace, then
you don't got a Z there :) (NOT just hooking Z to the Z on your scope, thast
just confuses things.)

however, that wouldn't explain why your spot killer is not lit.. if your
spot killer is not lit, then you need to look and see if you have the tube
heater going, then you need to rip apart the Z section on the deflection
pcb..

Andy
> No Blooming on the monitor before or after and I do have a HV probe..
> That's how I know Im getting 12kv. But as I understand it.. The normal
> reading should be 14.5kv and im not running that high. I guess I was
> asking if I should be able to see something on the screen (distorted or
> not) if I was running as low as 12kv, and if the answer was NO.. No
> picture at 12 kv, I should replace the diode (which Id rather not do
> unless absolutely necessary)
>
> Christopher X. Candreva wrote:
>
> > On Mon, 15 Jul 2002, Mark E Davidson wrote:
> >
> >
> >>Like I said before.. There is a picture there. (on the scope) so I know
> >>the board is putting out
> >>
> >
> > 'Picture' is not quite a technical term. What you have is x/y
deflection
> > that matches expected output. You've verified that you have X/Y
deflection
> > comming from the board -- that's it. There's a third componant needed
to
> > make a complete picture: Intensity, which provides both relative
shadeing of
> > images and blanking of non-image related movements.
> >
> > (Now, how's THAT for a load of techno-bable :-) Seriously -- defineing
your
> > problem is half the battle.[1]
> >
> >
> >>Would the loss of Z on the game board leave no monitor picture?
> >>
> >
> > Sure. Z is intensity. If Z=0, then the picture will always be at
intensity 0
> > -- blank. Since turning up the brightness shows a picutres, that means
> > deflection is getting there. (OK -- I'm assumeing here that 0 is blank
and
> > +volage is on. It could be inverse logic, etc, but it should be a
waveform,
> > not a steady 0 or +5 or anything)
> >
> > So, hook up the Z -- if the scope blanks too, there's your problem. If
just
> > the retrace lines go away, then it might be Z in the monitor.
> >
> >
> >>Is there a way to test the HV diode? (most likely not.. but I have to
ask)
> >>
> >
> > Other than using an HV probe -- I would say you did by turning up the
> > brightness -- was the picture bloomed ?
> >
> > -Chris
> >
> >
> > [1] I've got an older house with plaster walls, and needed to rewire an
> > outlet, preferabley without knocking holes in plaster. Problem was the
old
> > BX metal-jacket cable was stapled to the uprights, no way to get it out
> > without makeing holes. The old wire was fraying, no way it could be
saved.
> >
> > SO -- define the problem: The old WIRE needed to be replaced. The metal
> > jacket -- the part that couldn't be removed -- was fine. Use the old
wire to
> > pull a new piece of Romex through the old jacket -- problem solved the
> > simple way -- No holes, no mess.
> >
> > ==========================================================
> > Chris Candreva -- chris@westnet.com -- (914) 967-7816
> > WestNet Internet Services of Westchester
> > http://www.westnet.com/
> >
> >
>
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>
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Received on Mon Jul 15 12:11:35 2002