Vintage Simmons Drums (UK) Users Group

Hello:

I did buy this from someone in the States, and I do have the
schematics for the SDS-V.

After performing the test described below, I'm reading about 12 volts
at the secondary. This is a bit low, since the schematic indicates 15
volts. But, since I've never messed around with one of these units, I
don't know what range I should expect, not to mention the fact that
this equipment is old. Don't know if transformers lose some of their
capacity over time.

I'm not sure I want to plug this into a converter until I know for
sure what I'm dealing with.

I will add that it doesn't look like this transformer is a
replacement, although, as someone suggested in this thread, it may
just be a matter of using a different tap off the trans. If that's the
case, I should think that the fuse would have been replaced. I'm only
basing that on my SDS-7, which was presumably made for US export, and
has a 2 amp fuse, rather than 500 mA, like the SDS-V has.

Anyway, thanks for your kind suggestions, and I welcome any further
insight!

Cheers,

Jim Stewart


--- In Simmons_Drums@yahoogroups.com, "WT" <waveterm@...> wrote:
>
> Jim, did you buy it in Europe or did you buy it from someone in the
states ?
> 
> Before getting a converter I strongly suggest that you verify the
output 
> from the mains transformer.
> 
> This is very dangerous so if you are not 100% sure how to do it,
don?t !!!
> 
> I accept no responsibility for any problems caused by your part.
> 
> * Switch off and disconnect the SDS-V from the poweroutlet
> * Open the SDS-V and locate the transformer
> * Disconnect the secondary winding leads going from the transformer
to the 
> mixer PCB. Make sure they don?t short out each other
>    or touch any metal
> * Re-Connect the power source ( 120V ) and switch on the SDS-V
> * Measure the AC voltage between the two leads
> 
> Tell us what value you are getting.
> 
> It could be that your SDS-V has a transformer made for 220/240V
installed. 
> Hence the low readings from the 15VDC lines.
> 
> Or it could be that one voicecard is pulling the 15VDC down to
roughly 5VDC. 
> This can be checked by removing all voicecards from the frame.
> 
> WT
> 
> ----- Original Message ----- 
> From: "Berk Aarts" <B.E.R.K@...>
> To: <Simmons_Drums@yahoogroups.com>
> Sent: Saturday, September 20, 2008 10:42 AM
> Subject: Betr: Re: [Simmons Drums] SDSV Issues
> 
> 
> > See if I get this correct: You are in the USA where 110 V is the
mains 
> > standard?
> > You have a English piece off gear where the mains is 220 V? Am I
correct??
> > If oyu don't put a powerturner in between, that is not gonna work
(imo)
> > Do you have the scematics, so you are sure you're measuring 5
where it 
> > should
> > be 15Volt?
> > Berk