Re: Asteroids Deluxe / V2000 problem

I would agree with Andrew, I would suspect Q608, and Q709 or the section
that drives them.

Kevin

On Sat, Nov 27, 2010 at 8:21 AM, Andrew Welburn <andy@andysarcade.net>wrote:

> You should take a picture of it in test mode, the crosshatch shows up
> whats going on a lot better for me.
>
> Is the game pcb 100% ok? slim chance its an op-amp in the DAC section.
>
> It looks just like one of the monitor chassis transistors failing at the
> top end of its range/spec. You say you've changed the u57/u07 but don't
> mention anything about the 3716/3792? I'd guess you have a marginal chassis
> transistor that may well probably check good when metering out of circuit,
> but it will fail under stress in operating conditions, i have had this
> before.
>
> --
> Andrew Welburn
> http://www.andys-arcade.com
>
> ----- Original Message -----
> *From:* Scott Zeiser <scott@zeiser.org>
> *To:* vectorlist@vectorlist.org
> *Sent:* Saturday, November 27, 2010 2:10 PM
> *Subject:* VECTOR: Asteroids Deluxe / V2000 problem
>
> Anybody ever seen this before?
> http://www.youtube.com/watch?v=VH24sa23Er8 (Watch the left side of the
> screen)
>
> Monitor has been recapped, new HV diode, new deflection power transistors
> (U07/U57s), new big blue, AR-II board and game board have also been capped.
> Problem has only gotten worse -- video is out of date, now the left 1/4 of
> the screen is crushed in. Test pattern shows up normally for the most part,
> it's not as smashed in as the game is, but the left edge sort of pulsates
> back and forth...
>
> Recently picked up a cheap non-working AD board from ebay and repaired it.
> Backup board exhibits the same behavior, which points back to the monitor.
> But then recently I've had a friend swap in their deflection board and HV
> cage with no change.
>
> Any ideas?
>
>
>

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Received on Sat Nov 27 11:06:32 2010