Vintage Simmons Drums (UK) Users Group

Hi 

I just joined the group.

A friend just gave me an sds9 brain which has a few problems.   I`m a 
trained tech but mainly deal with analogue gear,& don`t do digital 
too much. I am hoping with a few pointers from you folk to fix it to 
go with my TMI.

Problems so far:

1.  Some of the switches have been robbed to repair another unit.  
Does anyone know which switches are a replacement available from a UK 
supplier preferably.
2. A UK supplier of replacement pots please.
3.  The Snare works, the toms are silent, & I get a low buzz out of 
the kick drum. The buzz comes out of kick individual out & the mix 
out but no other sockets. On opening up the unit I find that 2 chips 
have been pulled out. There are DILs maybe 20 pin on the far right 
hand side of the board.  I took the numbers down but stupidly left 
them at my workshop. 

Any help would be useful & if someone has the diagram that would be 
really useful

Thanks in advance Rob

Hi there!

There are chips (original replacement OEM) on ebay.  They are filter
chips, I believe...the link is:

http://cgi.ebay.com/6pcs-LAST-REV-CEM3372-Oberheim-Akai-Sequential-Circuits_W0QQitemZ7351562180QQcategoryZ38071QQrdZ1QQcmdZViewItem

As far as the potentiometers (the pots/knobs), you can just look at
these, then go to your local electronic supply store & order
these...or if 1 is broke off, just take it there & they can match it.

Just trying to help...hope it helps!




--- In Simmons_Drums@yahoogroups.com, "flinnrob" <flinnrob@a...> wrote:

> Hi 
> 
> I just joined the group.
> 
> A friend just gave me an sds9 brain which has a few problems.   I`m a 
> trained tech but mainly deal with analogue gear,& don`t do digital 
> too much. I am hoping with a few pointers from you folk to fix it to 
> go with my TMI.
> 
> Problems so far:
> 
> 1.  Some of the switches have been robbed to repair another unit.  
> Does anyone know which switches are a replacement available from a UK 
> supplier preferably.
> 2. A UK supplier of replacement pots please.
> 3.  The Snare works, the toms are silent, & I get a low buzz out of 
> the kick drum. The buzz comes out of kick individual out & the mix 
> out but no other sockets. On opening up the unit I find that 2 chips 
> have been pulled out. There are DILs maybe 20 pin on the far right 
> hand side of the board.  I took the numbers down but stupidly left 
> them at my workshop. 
> 
> Any help would be useful & if someone has the diagram that would be 
> really useful
> 
> Thanks in advance Rob

Hi Rob, welcome to the group.

The square push-button switches look the same as the ones used 
on the SDS-8 (can anyone confirm ?), if so, they are available
from maplin.co.uk part no. FF87U.

Regards
Tom W.

--- In Simmons_Drums@yahoogroups.com, "flinnrob" <flinnrob@a...> 
wrote:
> Hi 
> 
> I just joined the group.
> 
> A friend just gave me an sds9 brain which has a few problems.   I`m 
a 
> trained tech but mainly deal with analogue gear,& don`t do digital 
> too much. I am hoping with a few pointers from you folk to fix it 
to 
> go with my TMI.
> 
> Problems so far:
> 
> 1.  Some of the switches have been robbed to repair another unit.  
> Does anyone know which switches are a replacement available from a 
UK 
> supplier preferably.
> 2. A UK supplier of replacement pots please.
> 3.  The Snare works, the toms are silent, & I get a low buzz out of 
> the kick drum. The buzz comes out of kick individual out & the mix 
> out but no other sockets. On opening up the unit I find that 2 
chips 

> have been pulled out. There are DILs maybe 20 pin on the far right 
> hand side of the board.  I took the numbers down but stupidly left 
> them at my workshop. 
> 
> Any help would be useful & if someone has the diagram that would be 
> really useful
> 
> Thanks in advance Rob

Hi 

Thanks for the responses so far.

The chips that are missing are marked iC37 & IC38.  Can anyone verify 
that these are curtis chips & what the curtis part number is ?  

regards Rob


--- In Simmons_Drums@yahoogroups.com, "Tom" <tom@t...> wrote:
> Hi Rob, welcome to the group.
> 
> The square push-button switches look the same as the ones used 
> on the SDS-8 (can anyone confirm ?), if so, they are available
> from maplin.co.uk part no. FF87U.
> 
> Regards
> Tom W.
> 
> --- In Simmons_Drums@yahoogroups.com, "flinnrob" <flinnrob@a...> 
> wrote:
> > Hi 
> > 
> > I just joined the group.
> > 
> > A friend just gave me an sds9 brain which has a few problems.   
I`m 
> a 
> > trained tech but mainly deal with analogue gear,& don`t do 
digital 
> > too much. I am hoping with a few pointers from you folk to fix it 
> to 
> > go with my TMI.
> > 
> > Problems so far:
> > 
> > 1.  Some of the switches have been robbed to repair another 
unit.  
> > Does anyone know which switches are a replacement available from 
a 
> UK 
> > supplier preferably.
> > 2. A UK supplier of replacement pots please.
> > 3.  The Snare works, the toms are silent, & I get a low buzz out 
of 
> > the kick drum. The buzz comes out of kick individual out & the 
mix 
> > out but no other sockets. On opening up the unit I find that 2 
> chips 
> > have been pulled out. There are DILs maybe 20 pin on the far 
right 
> > hand side of the board.  I took the numbers down but stupidly 
left 
> > them at my workshop. 
> > 
> > Any help would be useful & if someone has the diagram that would 
be 

> > really useful
> > 
> > Thanks in advance Rob