DC problem on speaker output

[42001]

Hi guys,

I have a Final S220 subwoofer that makes an awfull noise. I discovered there is 750 mv. DC on the speaker. I replaced all caps inside, but no luck. I also saw Some bad solder connections on the PCB so corrected that. Still 750mv....

What could iT be?

thanks for any help!

 

[AndrewT]

how are you testing the amplifier?

 

[42001]

Hi Andrew, with light bulb

I have shorting plugs on the inputs. DC is 750 mv. on speaker output. My thought was caps....

 

[42001]

IT really is somewhat of a drama to work on this thing.... Everything saturated with glue....

 

[42001]

Glue

Tried to free the trimpots of glue.... That didn't go Well

 

[AndrewT]

Is this a double insulated amplifier/speaker?

 

[42001]

Double insulated

Yes iT is.

 

[AndrewT]

I withdraw from this Thread.

I and you are not permitted to modify any Double Insulated equipment.

It was the pic of the glued joints that alerted me to the risks of accidental shorting.

 

[42001]

Ok Andrew, good point. I guess I Will buy a new plate amp for my sub.

Thank you for trying!

Kind regards,
Sjoerd