Need Schematic Sunfire True Subwoofer Junior

[Jack Crow]

Hi all,
Did a web search and failed to come up with a drawing for...

Sunfire True Subwoofer Junior

It's a home 'bass box' unit.

The amp is well and truly blown up, all kinds of bad semi's.

Ideas welcome.

Jack Crow

[budm]

Re: Need Schematic Sunfire True Subwoofer Junior

Do you have any pictures?
Is this the one you have?
http://s807.beta.photobucket.com/use...37108149752414

[Jack Crow]

Re: Need Schematic Sunfire True Subwoofer Junior

Mr B,
That looks a lot like the unit I have. Mine has some subtle changes. As in using ribbon cables rather than discrete wires making the PSU jumper.

I failed to take photos, managed to mess up the USB system in my computer.

Did get a print of a similar unit that made much more power.
The circuit looks similar.

Right now I have a bunch of shorted and leakey semiconductors.

I don't want to waste the clients time and money by buying counterfeit transistors.

The main output transistors are OBS and I am real leery about ordering them from Chinese vendors on the web.

The FET's im on more firm ground, I can get them from Mouser.

Do you have a schematic?
As my dog would say,
Beg Beg, whine and whimper?

Thanks in advance.
Jack Crow

[budm]

Re: Need Schematic Sunfire True Subwoofer Junior

Did you try contacting Sufire?
http://www.sunfire.com/service.asp
http://www.thecarversite.com/shell.htm

[Jack Crow]

Re: Need Schematic Sunfire True Subwoofer Junior

B
Yes I called them, talked to a techie type there.

They do not issue drawings or schematics.

So Im still stuck.

The client found a page of carver drawings and that is where the 'close' document came from.

Jack Crow

[vsierra]

Re: Need Schematic Sunfire True Subwoofer Junior

budm,
My pcb matches the one in your photobucket library. I was wondering if you know which are the filtering caps that need replaced to fix humming sound on these subs. Help much appreciated.

Victor

[Ray Gianelli]

Re: Need Schematic Sunfire True Subwoofer Junior

budm,
My pcb matches the one in your photobucket library. I was wondering if you know which are the filtering caps that need replaced to fix humming sound on these subs. Help much appreciated.

Victor

I know this is an old post, but if you still have a hum issue try tightening up the grounds inside the unit.

[jworthin]

Re: Need Schematic Sunfire True Subwoofer Junior

Old post but a common problem: The 13V supplies are usually the source of the (no input cables connected) hum problems. On the power board replace C45, C46, C40, C39, C38 and C37. On the input preamp board replace: C7, C15, C17, C31, C32, C41 and C42. Use low ESR and low ripple caps. This applies to 2700W plate amps that have serial numbers that do not start with '96' (the year of production).

BTW: C18 (100uF) on the preamp is the cap that goes bad in the sleep/wake circuit.