Jamo sub200

[svetdts]

My friends,i need a schematic of that subwoofer.

[Khron]

Re: Jamo sub200

"Welcome to the club"

I got one of these, faulty, a couple weeks ago, and i'm in the process of "deducing" the schematic from the board, but it might be a while before i'm done with that...

[svetdts]

Re: Jamo sub200

"Welcome to the club"

I got one of these, faulty, a couple weeks ago, and i'm in the process of "deducing" the schematic from the board, but it might be a while before i'm done with that...

I'm grateful

[Khron]

Re: Jamo sub200

Well, i think / hope i'm done lifting the schematic.

I'm attaching a screenshot of the current state - i laid out parts as close as i could to how they're laid out on the board, to try to have a 1:1 or WYSIWYG sort of thing, to ease my labor

Next step is to rearrange the parts so they make more sense topology-wise.

I renamed all the parts with their corresponding silkscreen names, and i filled in the resistor values. I didn't really bother with the caps (especially since the ceramics aren't labeled in any way).

[Khron]

Re: Jamo sub200

Well, this is as far as i got. I *can* recognize some of the "building blocks", but some look a bit odd.

There *might* be a couple small errors (i can't guarantee the accuracy of the IC1B-IC1C region on the bottom, it looks a bit fishy), but at least for now, i've had enough of schematic-lifting

Hope it helps, though

Now i just gotta hook it up to a signal generator and try to follow the signal path with my scope. Hope i can pinpoint the issue soon/easily - the sub works, but only at a veeeeeeeeeeery low volume

[svetdts]

Re: Jamo sub200

Hi, Khron666, you are great,thank you very much.

[Khron]

Re: Jamo sub200

For what it's worth, the issue in mine proved to be the (cheap) pots...

No matter, i just used a couple wire jumpers to "skip over" the volume pot (so it runs basically at full-blast) and the frequency pot (so it's crossed over as high as it'll go)

Neither of those concern me, 'cause i'm doing the filtering / processing "in the box" (computer) anyway

[svetdts]

Re: Jamo sub200

my sub amp play with distortion

[sekerac]

Re: Jamo sub200

Hi svetdts,

my sub200 Jamo plays with hum or distortion too (it is not 50Hz, it's like irregular crackle..), did you solve problem with your sub, do you any idea, what was wrong?