Re: Trouble with Space Wars Monitor

Darn spell checker...it accepted "creak"... I meant, of course, "CREATE a
no-load situation"...Or is that the sound of transistors failing I hear?
Must prooff read!

John ;-#)#

At 12:44 AM 8/14/99 +0000, you wrote:
>On Thu, 12 Aug 1999 22:14:37 -0700, John Robertson <jrr@flippers.com> wrote:
>
> >Great Zonn! (like Great Scott only friendlier ;-)
> >
> >True enough that you can't run the monitor with BOTH the yoke and output
> >>>transistors unplugged, however for testing purposes you -->creak<-- a
> no-load
> >situation if you run the monitor with the yoke alone unplugged. If you have
> >no input signal to the monitor then there is no damage done to the
> >outputs. Consider that a vector monitor is just a rather overbuilt audio
> >amp, with surprisingly similar characteristics, and you will better
> >understand that !@#$%!@#$% things.
> >
> >John :-#)#
> >
> >At 06:54 PM 8/12/99 +0000, you wrote:
> >>On Wed, 11 Aug 1999 10:38:52 -0400, you wrote:
> >>
> >> >I'll try to sum up my problem as clearly as possible, this is my
> first X-Y
> >> >monitor game, so I'm new at this:
> >> >
> >> >Currently, the monitor only displays the upper left quadrant on the
> screen.
> >> >All of the power transistors (Q110, Q111, Q210, Q211) check out OK when
> >> >tested with a diode tester. If I run the monitor with the power
> transistors
> >> >disconnected, I get a nice little rectangle in the middle of the screen.
> >>
> >>For a little while, then you will start noticing smoke coming from
> >>R118, R119, R218, R219 and possibly Q108, Q109, Q208, Q209, as these
> >>parts try their best to drive the yoke alone.
> >>
> >>Running the monitor without the yoke plugged in, and the power
> >>transistors NOT plugged will eventually lead to monitor damage.
>
>Oops I blew it here, what I *meant* to say was:
>
>"Running the monitor WITH the yoke plugged in, and the power
>transistors NOT plugged will eventually lead to monitor damage."
>
>This is the condition that will cause the pre-drivers to try and drive the
>yoke
>without help from the final output transistors, leading to the frying of
>parts.
>
>Sorry about that!
>
>-Zonn

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Received on Sat Aug 14 01:15:54 1999