Vintage Simmons Drums (UK) Users Group

Hi everyone;

I recently aquired an SDS-9 in defective state. Apart from two broken pots
it appears to crash its software frequently (it only starts up on occasion).

Anyway, after taking it apart there seems to be a lot of "rot" or corrosion
around several IC's; most notably the processor (and also a couple of other
chips). Interestingly this is definitely NOT coming from the battery (which
is located pretty much across the board). There is no clear pattern which
IC's are affected; some are close to openings (so in theory it could be
spilled liquids) but others are not.

While it is clear to me that I probably need to swap at least the processor
and perhaps a couple of other chips I certainly would like to find out what
causes this. Not all the corrosion seems to be really aggressive; around
some IC's it's a bit like a white residue. I remember seeing something
similar in an SDS-8. Could this be flux or flux removal gone wrong?

Last but not least: I think the Simmons enclosures are pretty good
contenders for "worst mechanical design" in terms of disassembling and
assembling. The SDS-8 was pretty bad and the SDS-9 is not much different...

Malte Rogacki skrev 2014-01-17 00:08:
> Last but not least: I think the Simmons enclosures are pretty good
> contenders for "worst mechanical design" in terms of disassembling and
> assembling. The SDS-8 was pretty bad and the SDS-9 is not much different...

Ever been inside a Roland SH-101? 32 screws on such a basic synth. ;)
And I think both the SDS-III and SDS-IV are a delight to get into. They 
even stand wll "undressed" for testing.

But yes, I got the point! :D

-- 
electronically yours, jesper

- -- --- ---- ----- ---- --- -- -
www.electronic-obsession.se

I will add that the SDSV is great to work on if you never need to work on anything but the cards !

i had to save an enclosure last year and the boards were riveted to the chassis!  You also need to desolder a 20+ pin header that connects the mix/power board to the back board thats riveted to the chassis.
 
total PITA.

Once you are there you had better do all the caps and such because it's total bullshart.

I actually popped the rivets and used screws and detachable headers so the unit will come apart in 20 years when it's time for another cap job.

lol.

 
NEW ALLIANCE EAST!!!!

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On Monday, January 20, 2014 3:21 AM, jesper <jesper@...> wrote:
 
  
Malte Rogacki skrev 2014-01-17 00:08:
> Last but not least: I think the Simmons enclosures are pretty good
> contenders for "worst mechanical design" in terms of disassembling and
> assembling. The SDS-8 was pretty bad and the SDS-9 is not much different...

Ever been inside a Roland SH-101? 32 screws on such a basic synth. ;)
And I think both the SDS-III and SDS-IV are a delight to get into. They 
even stand wll "undressed" for testing.

But yes, I got the point! :D

-- 
electronically yours, jesper

- -- --- ---- ----- ---- --- -- -
www.electronic-obsession.se