Discussion about the Korg PolySix synthesizer

Ha! That's why I wanted a larger picture as I couldn't make it out. You have
to admit it does look like the pin 1 dot at the wrong end, but this would
mean the screen printing on the chip is on upside down! Otherwise it might
be just a fleck of round dirt. I have to say I though the whole repair was
untidy and looking like it might fall to bits down the line some time. I now
routinely change the mask ROM holder when I get one in because all sorts of
nasties can get underneath without otherwise being spotted. 

 

Anyway, where were we. Yes, if the IC is polarised right the battery holder
arrangement might be causing a partial short. Any anyway, what IS that red
goo underneath, I wonder!?

 

Let us know Milan, if you are reading this!

 

Andy

 

From: PolySix@yahoogroups.com [mailto:PolySix@yahoogroups.com] On Behalf Of
Chromatest J. Pantsmaker
Sent: 18 March 2009 17:29
To: PolySix@yahoogroups.com
Subject: Re: [PolySix] Re: Having problems after battery replacement

 

After staring at it for a minute, it looks like the SRAM IC is in
correct to me. I can vaguely make out a "pin-one" notch at the end of
the IC towards the bottom of the picture.

On Wed, Mar 18, 2009 at 3:49 AM, Andrew Jury <andy@networkjabber.com
<mailto:andy%40networkjabber.com> > wrote:
> Hi Milan,

> One big observation is that it looks like the SRAM IC is in back to front!
> There is usually a dot marking pin 1 of the device. This seems to be where
> pin 10 is if you look carefully (this is the chip next to the orange
> connector). Could you take a mega close up picture of this device so we
can
> have a good look at it. It must admit if this was the case then the print
on
> top of the chip is upside down and the patch memory wouldn't work. But
that
> sure as hell looks like the pin 1 dot to me!!

-- 
.sig
-Chromatest J. Pantsmaker
http://www.chromatest.net





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