RE: Question on ELMINATOR SOUND CARD with NO AUDIO Output and X/Y Output.....

Mark,
^^^^^

 One other thing which comes to mind,
and again this may or may not be important,
but when I initially hooked up the Output
from this Sound Board I may have, at least
initially crossed the GND and SOUND OUT from the
Sound Board into the G-80 Power Supply (AMP)
 
 Now I know that the AMP WORKS just fine,
as I have tested it, but now wonder if, when I
did the above I blew something on this Sound Board ???

 Thanks..........
Arcadius............. :-)

-----Original Message-----
From: Stempak Arcadius-ASTEMPA1
Sent: Tuesday, October 01, 2002 5:27 PM
To: 'vectorlist@synthcom.com'
Cc: Stempak Arcadius-ASTEMPA1
Subject: RE: VECTOR: Question on ELMINATOR SOUND CARD with NO AUDIO
Output and X/Y Output.....

Mark,
*****

 O.K. Thank You, and as for White Noise,
actually let me rephrase this, it's more
like Static, if you want to call it that,
I.E. kind of sounds like a SHHHHHHH type of noise.
kind of the old days when you tuned your T.V. to
a Channel Not INS (UHF CHANNEL) and saw STATIC on
the SCREEN while also listening to this type of Noise.

 And again this Noise, or Sound is very
much present the entire time I have this
thing powered up.

 Could there be something wrong with one of
the ROMS which would cause this issue ???

 Better yet do you know Which Number ROMS
actually Store (Contain) the Sound Code ???

 Also verified the Backplane and it's All Clean.
In addition blew out All of the DUST and checked
every connector.

 Thanks.....for all of your assistance....
Appreciate it........

Arcadius........... :-)
-----Original Message-----
From: Mark Jenison [mailto:jenison@enteract.com]
Sent: Tuesday, October 01, 2002 3:49 PM
To: vectorlist@synthcom.com
Subject: Re: VECTOR: Question on ELMINATOR SOUND CARD with NO AUDIO
Output and X/Y Output.....

> I am wondering if I am doing something wrong, but what, especially
> and even with other Boards (X/Y) REMOVED and only the CPU, ROM and SOUND
> Board in the CAGE I still get the same (White Noise) and no audio.
>
> Also would like to get you input on replacing Electrolytic Caps, if
> I recall correctly as long as the Voltage and uF are identical of greater
> you can Sub one cap for another ??? I.E. Replace a 10uF 25Volt with a
> 22uF 35Volt <- does that sound right ???

No, but I'm not an EE. :-). I think the rule is same uF, but higher voltage
is ok.

> Finally and upon looking at the ROM BOARD itself, It only contains 14
ROMS
> which I believe is Normal for ELIMINATOR from U1 to U15 or something like
> that
> however I noted that on this Same ROM Board U29 Socket has a DM74LS245N
> Plugged
> into this Socket, should this part be there ???

Yes, that's correct.

> Just wondering as the
> Schematics
> make no mention of such a part on the ROM BOARD.

If you are still getting white noise, normally I would still suspect the CPU
board, or voltages to the boardset. Are you sure it's white noise, and not
just loud "nothing"? At this point, I'd swap around known good working
parts, but most people don't have this luxury :-). From where you're at
now, I would start using a logic probe, but without a custom extender card,
it's very difficult to do any probing of boards in the cage. I've heard of
people removing the back bus from the cage and setting the cards up so they
can access them; you may want to try that at this point.

--
Mark Jenison
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