Re: Star Trek sound problem

Lewis,

I had a problem like this once. From my repair notes, I found a similar
entry. Your solution might not be exactly the same, but maybe you can
follow my debugging logic.

Symptoms: Phaser, coin drop music, intro music, red alert all stick last
note

Check outputs of U43, 42, 41; look ok. Check processor; no signal on pin 2;
replace processor; no change. Pull up resistor at R10, R9, R8; pulling up R9
removes whine; reconnect and pullup pins R14, R13, R12; pulling up R13
removes whine. Shorting pins 1 and 2 of U4 removes whine after music is
over. Replace U4; no change. U13 is 3 of the inputs/outpus to U4, so I
replace U13; sounds are fixed.

Final fix: Replace U13 (DAC)

----- Original Message -----
From: "Lewis D'Aubin" <ldaubin@bellsouth.net>
To: <vectorlist@vectorlist.org>
Sent: Tuesday, May 05, 2009 11:02 PM
Subject: Re: VECTOR: Star Trek sound problem

> Hello everybody,
>
> Anyone out there familiar with Sega architecture - particularly the sound
> board in a Star Trek? I've got one that's misbehaving slightly. When
> playing a synthesized tone, the tone doesn't decay properly - it just
> keeps sustaining. Everything else sounds great. Here's an audio example
> I recorded this afternoon.
>
> http://www.consortiumofgenius.com/arcade/star_trek.mp3
>
> If you listen carefully, you can hear it do the same thing when you dock
> at a space station. Those sounds should decay, not keep going.
>
> Hopefully this is just a cap I need to replace somewhere. Any ideas on
> where to look?
>
> (PLEASE no critiques of my gameplay based on this audio! You'd suck too
> attempting to hold a laptop on the CP between your hands while you're also
> trying to rotate a spinner!!!)
>
> Cheers,
>
> -Lewis
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> chris@westnet.com

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Received on Wed May 6 19:35:12 2009