Re: Asteroids graphics and sound issue

To wrap this up, I ended up replacing pretty well everything in the scale section I could see on schematics, with nothing working so sent off to Teeray to look at and he fixed it for me by replacing the one chip I didn't replace (Murphy's law!).. H10 the 7404 inverter IC. Thanks to Tim for solving this one!

--- On Tue, 3/23/10, teeray <teeray@earthlink.net> wrote:

> From: teeray <teeray@earthlink.net>
> Subject: Re: VECTOR: Asteroids graphics and sound issue
> To: vectorlist@vectorlist.org
> Received: Tuesday, March 23, 2010, 5:38 PM
>
> >>>>>>-----Original Message-----
> >>>>>>On Sun. 3/21/10, at 2:53 PM, andre
> wrote:
> >>>>>>
> >>>>>>I am fixing an asteroids cocktail
> for a friend. It originally had just the
> >>>>>>p1/2 lights flashing non stop. I
> replaced the eprom sockets and all of the
> >>>>>>ram following the test tones.
> >>>>>>Now it works..sorta..
> >>>>>>
> >>>>>>It has 2 issues.. the first is a
> graphical issue. The gamefield fills the
> >>>>>>screen fine, but everything is
> microscopic.. the ship and asteroids are only
> >>>>>>a couple mm big, and you can see
> the text.. it looks like text.. but far too
> >>>>>>small to read. You can see your
> shots and the ufo's shots. I have replace chips
> >>>>>>in the scaling circuit at K5, K7,
> M7 and swapped a good 7497 through the 4
> >>>>>>socketed banks all with no
> difference. I also tested Q7 and Q9 as good..
> >>>>>>not sure where to go from here.
> >>>>>>
> >>>>>>2nd issue is in the sounds. All
> sounds are fine except for the player's shots,
> >>>>>>and the ufo's firing sounds. They
> sound more like morse code tone when you fire.
> >>>>>>I checked Q1, Q5. Replaced a few
> electrolytics, changed n9 on the basis of
> >>>>>>another repair log, c65.. I do not
> have any ls259's for M10, and have not
> >>>>>>checked the 324 at L8 which I think
> is the only thing in common but not sure
> >>>>>>if that would do it?
> >>>>>>
> >>>>>>
> >>>>>
> >>>>>
> >>>>>On Mon, 3/22/10, 1:10 PM, teeray
> wrote:
> >>>>>
> >>>>>Scale - Check the ls161's D7, C7, B7
> >>>>>
> >>>>>Sound - Check L8, M9
> >>>>>
> >>>>>Tim
> >>>>>
> >>>>>
> >>>>
> >>>>
> >>>>On Mon, 3/22/10, at 9:44 PM, andre wrote:
> >>>>
> >>>>Thanks.. the 4016 at M9 was the sound
> culprit.. after replacing that I lost the
> >>>>thump sound.. So replaced the 555 at N8 and
> got that back.
> >>>>
> >>>>So far in the scale section I have replaced
> E7, M7, F6 and comparator'd
> >>>>B7,C7,D7,A9,M6,A9 and all come out ok...
> The more I look at it it might not just
> >>>>be scale.. everything is very tiny, but I
> notice especially when something
> >>>>explodes, the explosion is along a
> horizontal plane.. it has a brighter dot at
> >>>>each end with smaller dots inbetween with
> the line about a 1/4 inch long. Also, it
> >>>>does not take one of the micro asteroids to
> hit the dot that is the players ship
> >>>>exactly for a collision.. if its about a
> 1/4 inch away on the screen for the ship
> >>>>it will be a collision.. if it was 'just'
> scale I would think the dots would need
> >>>>to physically meet.
> >>>>
> >>>>
> >>>
> >>>On Tue, 3/23/10, 1:36 AM, John Robertson
> wrote:
> >>>
> >>>  If you have a logic probe or 'scope,
> check the inputs to the DACs to make
> >>>sure all data lines are toggling. If the most
> significant bits are not then
> >>>backtrack from there. If all bits are toggling
> then check your +/- 15VDCsupply...
> >>>
> >>>Heck check ALL the voltages first and save some
> time! I think you may have a
> >>>missing supply on the logic board...
> >>>
> >>>John :-#)#
> >>>
> >>>PS, please don't  top post - post under
> the reply - and also do not clip off
> >>>previous portions of messages (you can trim
> small bits if it helps clarity)
> >>>as it gets harder and harder to track the
> progress of the troubleshooting
> >>>process if we have to open older messages to
> see what the original complaint
> >>>was! Thanx.
> >>>
> >>>--
> >>>John's Jukes Ltd. 2343 Main St., Vancouver, BC,
> Canada V5T 3C9
> >>>Call (604)872-5757 or Fax 872-2010 (Pinballs,
> Jukes, VideoGames)
> >>>           
>      www.flippers.com
> >>>"Old pinballers never die, they just flip out"
> >>>
> >>>
> >>
> >>
> >>On Mar 23, 2010 11:30 AM, andre wrote:
> >>
> >>Was not aware every one was top posting.. I am just
> replying from my mail program..
> >>is there some other way to reply so they follow in
> a thread?
> >>
> >>
> >
> >
> >On Mar 23, 2010 4:25 PM, teeray wrote:
> >
> >Could you post a picture of the screen, also one of the
> test screen
> >somewhere for us to see.
> >
> >Does the test screen display OK, just microscopic?
> >
> >Tim
> >
> >
>
> For the picture to look correct but just be small. It has
> to be something
> affecting both the X and Y outputs.
> Maybe F10
>
> Tim
>
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Received on Tue Jul 27 20:19:52 2010