DSS 930 and DSC 950 Change from 110 Volt to 220 Volt ??

Hello Robert,

There are several models with extra terminals on the transformer.
( extra is more than two on the primary side of the transformer)

These extra terminals are connected to the mains-supply-pcb.

On most of these pcb's are possibilities to change the wiring. Not the transformatorterminals, but the special blank & short wires on the pcb
are intended for selecting the voltage.

You will probably need a detailed description of the pcb before you can switch voltages unless you really understand what you are changing.

Hello Herman,

thanks for your help.
Do you have personal experiences on that?
I am also searching for a service manual as i post it,
hopefully it wil descripted there.
Maybe you will have an idea where i can get that info.

Thanks

Robert

My personal experience is with changing the set from 220 to 240 volt.

I figured out the resistance between the primary wires of the transformer in order to change the setting.
On one speaker it worked fine, but I found another kind of transformer (with only two primair wires) when I opened the second speaker.

That was over two years ago, so I can't remeber any details.

Hi m8,

I just joined today and saw your message.

I have the DSC950 myself and the service manual. According to it you can change the voltage, in other words the transformer is fit for both 110 and 230 VAC.

If you are still here and interested, I am willing to help out.

Greetz,

m0vieman.

Hi m0vieman,

thanks for your help again.
Iam still interested on both equipments.
How we can proced?

Thanks

Robert

Hi,

I'll screw the thing open and will look into the schematics. I might find out how to simply change the voltage...

That is what you want to do, change from 110 to 230, right?

Hang in there...

Greetz,

m0vieman

@m0vieman wrote:

...I'll screw the thing ...

hahaha, jij spreekt leuk engels 😛

Je weet toch dat je apparatuur met net zoveel liefde als een vrouw behandelen moet... 😆

Groetjes,

m0vieman.

I don't know if you have solved your problem. I had the same and did as follows. The primary transformer consists of 2 sections. In 110V these are switched in parallel. To make then 220V you switch them in series.
I hope this picture clarifies things a bit.

a b c d
o-www-o o-www-o primary side
==========
o--mmm--o secondary side (no need to change anything)

For 110V a is connected to c and b to d. The 110V supply is connected to ac and bd.

For 220V disconnect all above and connect b to c. The 220V supply is connected to a and d.

In case you are not sure connect a resistor in series to prevent the whole thing from damaging in case you made a mistake. With a 120E resistor you limit the peak current to 2A. That should prevent any lasting damage. Next measure the secondary voltages, if these are OK then you connected everything correctly. Now remove the protection resistors and you're finished.

😀 😀 😀 😀 😀 😀
Hello jurgeng,

thanks a lot, sounds logic.
How do you that,do you a scematic,or dit you search in the hard way on the circuit board?
What about the long term experience with your speakers,because the frequency is changed from 60 to 50 Hz(20%)?
Maybe the transformer have enough "overpower"
or have the two windings now in series
instead of parallel(internal losses-means heating) will help?

I will try your suggestions asap

thanks again

Robert

"How do you that,do you a schematic,or did you search in the hard way on the circuit board? "

I am an electronic engineer, so I did some thinking and then confirmed my thinking by doing.

The frequency change does not matter in this case. I will not bother you with the details how a transformer works. You can check http://en.wikipedia.org/wiki/Transformer

If I have time I will make a photo of what I did. This should help you a lot to make the correct connections.

@jurgeng wrote:

...and then confirmed my thinking by doing.

*m0vieman hands over fire-extinguisher* 😈

If this doesn't help, please call 911. 😛

P.S: I am kidding of course. LOL

Greetz. 😉