Re: Battlezone Shaky vectors

Thanks for that..... Everything seems ok so far.... Yes got a scope hooked
up....

Forgot to mention that when in the diagnostic mode, the vectors are
perfect.. eg steady / rock solid.... So I would expect the shakes there
too if it were a psu problem....( to much of a rush to post the problem and
not enough explanation , sorry.!! ) ..... Its really quite puzzling.... :-)

I thought that it may be something to do with the centering... but unlikely
as it uses two separate analogue switches for the x and y and its shaking a
little on both axis..... ( Btw....I had a similar problem on my starwars
which was cured when I re-capped the HV unit.) This Monitor I'm using to
test asI rebuilt it, the scope on xy mode shakes too..

I'm also thinking that the Dac08 might be at fault ( or something to do with
the reference voltages/bips and associated circuitry ???) Presumably its a
fixed value in the diagnostics..so thats why its ok ? I may try and borrow
the dac from another non working board to see if it cures it.....

I've replaced the TL084/82's during the course of repairing the window
circuit, so they are ok.

Any ideas whould be appreciated.....

Many thanks,
Regards,
Colin

----- Original Message -----
From: peter jones <highwayman2000@mail.ru>
To: <vectorlist@vectorlist.org>
Sent: Wednesday, October 05, 2005 10:58 PM
Subject: Re: VECTOR: Battlezone Shaky vectors

>
> -----Original Message-----
> From: "Colin Davies" <colin.w.davies@btopenworld.com>
> To: <vectorlist@vectorlist.org>
> Date: Wed, 5 Oct 2005 22:42:37 +0100
> Subject: VECTOR: Battlezone Shaky vectors
>
> > Hi Guys,
> >
> > Got my first battlezone cpu / math box running after a bit of fighting
with a solding iron, only casualties are a burned finger so far...
> >
> > Main problems found were a couple of bad counters on the timer which
showed up with a probe / comparator, and a shorted capacitor on the sample
and hold / window circuit only giving me the top half of the screen...
> >
> > Ok... the vectors are little bit wobbly / shaky... Its been suggested to
have a prod at the vector timer circuit, but I would appreciate some
trobleshooting tips please if anone has seen this before....
> >
>
> got a scope?
> if yes then check all your power lines, and if you can set the scope for
x-y mode try using it as a monitor.
>
> no point wasting time on the pcb till you know the rest is good.
> and check your edge-connector isnt getting warm at the ends. !!!
>
> *all* my atari b&w vector pcb's (atleast 6) have signs of burning from
this problem - it's not if but when.
>
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Received on Wed Oct 5 18:29:33 2005