Vintage Simmons Drums (UK) Users Group

Dear Michael & Jesper, I want really thank you for your help.
Michael: with the hint you gave me, I'll try to explain the problem 
to a repair shop. Here in Italy I can't find a specialist of these 
units, so it's good to start with an idea of what can be wrong.
In case I have no luck here I will ask you the contact of Thierry.
Thank you so much.
Giame - www.lovelyrita.it

--- In Simmons_Drums@yahoogroups.com, "Michael Buchner" 
<buchnerelectronics@...> wrote:
>
> Hello,
> the diagnostic is difficult without the SDS9 on the table, but 
I'll try. You don't need a stereo pad to check, if you work with 
button mode or midi. Open the unit to check several things. (If you 
are not experienced, let a repair shop do it). All following parts 
are on the main PCB, most located in the area around the eprom 
sockets. First: Check for signal yes/no at pin4 on rim DAC (IC 31). 
If no, check, if counters IC 27 and 28 are working (you should hear 
different frequencies of the counter stages, if you have no scope). 
Is the very low beep you were talking of changing in frequency, if 
you alter the rims pitch?
> Your trigger LED is working, so you should have an envelope at pin 
14 of IC 31, verify that (check also the 3.9k resistor). If you have 
working counters and the envelope is present, change IC 31 .If you 
can hear a raw rim noise at the DACs output (pin 4), check signal 
flow to IC 33 pin 6. If you can hear the snare sound, this IC is not 
dead and you are lucky, because it is an expensive one (CEM 3372). 
Check all parts in the signal path from IC 31 to IC 33. IC 33 mixes 
the snare and the rim together (and more...), if you can hear the 
snare, all parts after IC33 are ok. There is also a CV regulating 
the balance between snare and rim sounds, you should test that on 
pin 5 of IC 33: If you alter the snare/rim balance, something must 
happen with the CV there (and the snare sound should fade out at 
least). If no change in voltage is noticed, you should check demux 
IC 65 and s/h TL074 (IC 13).
> If you need the schematics, no problem. If you need the unit 
repaired, ask Thierry EPPHERRE from france, he is the specialist 
(godfather) for SDS9.
> Good Luck.
> Michael
> 
>   ----- Original Message ----- 
>   From: giamesimmons 
>   To: Simmons_Drums@yahoogroups.com 
>   Sent: Thursday, January 03, 2008 7:38 PM
>   Subject: Re: [Simmons Drums] sds9 proms dead? 2
> 
> 
>   There's a dedicated channel for the rimshot consisting of two 
proms: 
>   one for rimshot and one for cross stick, you can program if you 
want 
>   to use rimshot A or rimshot B..
>   However the input for the trigger signal is only one jack 
stereo: tip 
>   for the snare and sleeve for rimshot. The rimshot so is 
activates 
>   when you strike the border of the dual zone pad connected to 
this 
>   stereo input. All of this in theory because I don't have the 
dual 
>   zone pad... however I can trigger from a midi keyboard and the 
>   rimshot channel don't want to work...
>   If I put the snare prom into the rimshot slot, it don't work.
>   If I put the rimshot prom into the snare slot: it's ok...
>   Giame
> 
>   --- In Simmons_Drums@yahoogroups.com, jesper <jesper@> wrote:
>   >
>   > giamesimmons skrev:
>   > > 
>   > > 
>   > > No, I'm doing test with the button tap function, that allow 
me to 
>   test
>   > > the sounds without striking the pads...
>   > > To tell the truth, I'm not sure to have the stereo pad, as I 
>   tried all
>   > > the pads with a stereo cable in the snare jack input, but no 
one 
>   seems
>   > > to trigger the rimshot channel (no led lit). They should be 
all 
>   sds9
>   > > pads because they have the rubber surface, even if they have 
a XLR
>   > > connector. I read that the snare pad should have a grey 
>   coloured "O" on
>   > > the Simmons logo...but I haven't. So I tested with button 
tap 
>   function
>   > > or with MIDI, using a keyboard as controller..
>   > 
>   > OK, back to original post then;
>   > 
>   > > "On my sds9 I can't get the rimshot sound. I made different 
>   tests: I
>   > > know for shure that the proms are good, because if I put the 
>   rimshot
>   > > prom in the socket of the snare, I can hear their sound.
>   > > I know also that the channel triggers correctly, because 
when I 
>   put
>   > > the unit in manual tap mode and press the button of the 
rimshot
>   > > channel, I can see the trigger light on, and I can hear I 
very low
>   > > beep sound from the output... so I have to guess it's the 
internal
>   > > circuit that hold proms that is dead ?....I'm not so expert 
with 
>   this
>   > > stuff..."
>   > 
>   > I don't follow 100% then. Is the rimshot a dedicated prom and a
>   > dedicated channel or is it an add-on to the snare so to speak?
>   > 
>   > If you put the snare prom in the rimshot socket then? Any 
sound?
>   > 
>   > -- 
>   > electronically yours, jesper
>   > - -- --- ---- ----- ---- --- -- -
>   > www.electronic-obsession.se
>   > www.myspace.com/machinepop
>   > - -- --- ---- ----- ---- --- -- -
>   >
> 
> 
> 
>    
> 
> [Non-text portions of this message have been removed]
>