[sdiy] U-20 questions

[Tony Kalomiris]

At 07:35 AM 6/23/2005 -0400, WeAreAs1 at aol.com wrote:

. . . The reason I ask is because very occasionally, one of the Mask Wave
>ROM IC's can go bad, and you might lose just some of the sounds, or some 
>of the
>key ranges -- but the specific keys that go south would not always be the 
>same
>ones for every patch.  I have seen this happen on U-20's before.  The fix was
>to replace the Mask Wave ROM IC -- about $35.00 from Roland


Rom "C" failed in the test and this is the reason I get no sound sometimes 
- all I get is a very low frequency drone, like when I trigger the MS20 
with no KBRD voltage.

I took the whole darn thing apart AGAIN and this time cleaned the 'tits' 
with swap and isopropyl and light resurfacing with super fine sandpaper.

I tested the diodes , ALL of them, they were fine.IOW no prob in KBRD 
mechanics etc.

After I cleaned it I fired it up and guess what ? All notes play now ! 
(Still in pieces on bench)

Now I put it back together and turned it on, and for some odd reason it 
decided to "Initialise Memory on its own :(

So now I have no sounds , a 'dead' Rom C chip.

So my next move is to reload the sounds.

Where the heck do I get em'  and why doesn't the machine load in it's Rom 
sounds (it loads em from Memory Card only )

Tony


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