Wharfedale subwoofer on 220v only. How can I make this 110v

[Gusss]

So I picked up this active subwoofer, but it only works on 220v. Its working fine, except I don’t have 220v.

Getting an external transformer would be my last option, is there an “on board” solution, a doable one?
I haven’t been able to find schematics on this one…
thanks

 

[George S.]

Probably that set of jumpers set the transformer secondary output voltage.
There's probably two secondary windings in the transformer.
For 220, they're wired in series.
For 110, they're wired parallel.
With it in hand and a ohm meter, I could figure it out.
But from here, that's all I can say.
Proceed cautiously.
Perhaps identify the transformer and find the data sheet. Configuration data should be there
Those boards are probably somewhat generic and have commonality with other products. Perhaps other similar products have documentation.

 

[J!m]

Looks like a SMPS so it can be replaced with a different one.

Just need the output voltage and amperage and spec a new one.

 

[Gusss]

Here is what I found…
The two big caps are in series… and there is a J1 that is supposed to be jumpered….

 

[George S.]

Cool! J1 110V.
Have to wonder if a 220V jumper needs removed.
May want to draw the circuits on a piece of paper and make sure it makes sense.
First time powering it, use a Variac and DBT to bring it up slow, if you have them available.

 

[Gusss]

Done… fixed… thanks for the help… only J1 had to be jumpered/bridged…

 

[mr_rye89]

It's strange that the SMPS doesn't detect the input voltage. Easy fix anyways

 

[Gepetto]

It's strange that the SMPS doesn't detect the input voltage. Easy fix anyways

It does not have a PFC (power factor correction circuit) Kyle