Re: Tempest resets at specific point in attract

You don't have any spare Alu chips do you? the 2901's. You could try
swapping them out one at a time, and see if it's a math chip causing the
fault.

On Fri, Jul 6, 2012 at 11:56 AM, andre <livnfree_can@yahoo.com> wrote:

> Swapped the 1495's back in.. Verified one was dead in Y in socket closest
> to inside of pcb. Symptom was the entire image shifted down a half a screen
> when the dead one was put in the socket.
> voltages tested and solid.
> Took board back and re-soldered the connector pins for the wire harness,
> checked and verified continuity across the installed loom. It seemed to run
> ok when I first put boardset back in. I let it run again while doing other
> things and thought it might be solved. Went back after 10-15 minutes and it
> was doing the same resetting on the 'Tempest' screen. The clicking I
> verified as both coin counters counting 1 credit when it resets.
> Took board out and socketed the dac08. Grabbed a new one and put in
> socket, went back to storage to test it out. It does the same thing but
> started the reset immediately in the attract cycle and resets when the word
> 'tempest' is still very small. Usually it would take a few mintues running
> fine before it would start to reset. This time though when it resets it
> seems to let out a loud squawk like a partial low rom tone when it
> resets... every time. Old DAC-08 back in socket does the same thing.
> No chips are overly hot, or more than usual, as I thought before that the
> fact it took a while to start resetting might be thermal related.
>
> *From:* Kevin Moore <talon.k@gmail.com>
> *To:* vectorlist@vectorlist.org
> *Sent:* Thursday, June 28, 2012 8:30:22 AM
> *Subject:* Re: VECTOR: Tempest resets at specific point in attract
>
> That tempest text is generally a bad Dac08
>
> Kevin
>
>
> On Thu, Jun 28, 2012 at 8:35 AM, Andre <livnfree_can@yahoo.com> wrote:
>
> Have a tempest pcb that played blind in a working cab. Found a couple pins
> touching between a cap and resistor by the y 1495's. Pulled the legs apart
> and screen came up, but entire image shifted half off bottom of screen. One
> of the 1495's was dead. Replaced and seems to work fine... but...
>
> In attract mode it does an odd thing. Everything looks ok until it gets to
> the screen where the word 'tempest' comes towards you. The roman numerals
> in front of the word 'atari' fade out to black, but the word atari is fine.
> When the word 'tempest' zooms towards you, the word trails do not fade out
> but stay on the screen so the entire mass of tempest words start to ripple
> severely.. by ripple its not a physical monitor ripple but a fade to black
> ripple.. actually looks like the ripple effect you see when you try and
> film or take a picture (the camera viewfinder image) of a running crt, but
> way worse.
> As I let it cycle a couple times through attract watching what it did, it
> eventually just would reset when the tempest words shot out about 1/3 of
> the way. There is a coin door click and the attract is starting over
> instantly. Its not monitor or cab as works fine with original boardset. Any
> ideas?
> --
> Sent from my Android phone.
>
>
>
>
>

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Received on Fri Jul 6 13:27:06 2012