Behringer UB1832FX Pro Schematic anyone?

[tubeswell]

My 1832FX went south in the weekend after 8 years of loyal trouble-free operation, and I'm on the hunt for a schematic before I toss it in the garbage heap if anyone can help please. Google is proving it can't be of much use. TIA Pete

[nickb]

Here you goBehringer UB1832FX-PRO-1.pdf

[tubeswell]

TFT Nick :-) Now for the fun part.

[tubeswell]

Is there a separate schematic for the power supply module? (only I was hunting for the picture of the PT and its values) Edit - Ah P13 - I see it I think - 'MTR' left and right (I guess that's German shorthand for 'Mains Transformer') Interesting - is IC6Z a shunt regulator (not being a silicootie buff myself, only it looks vaguely like something in Merlin's 2nd book)?

[mozwell]

UB power supply, switchmode type.
Here is rev F of the schematic, i hope they help you out

[tubeswell]

Most excellent thanks moswell

[Enzo]

No, MTR L and R are for Meter left and Meter right. Note those two are at the input to the LED ladders for the VU meters. That signal comes from page 12, look for a couple JFETs between the CR/Phones faders.

Power supplies come onto the mixer on page 13, lower right. All come from the power supply module.

The download from Elektrotanya is 15 pages, but also lacks the power supply. I linked that over in the other section where you posted.

The power supply is an SMPS like most Behr products. The UB series all seem to use the same SMPS which is type SPSU2. Also used in some Xenyx models.

AHA!! Elektrotanya has a separate file for Behringer SPSU2.

[Enzo]

Oh geez, you guys got it covered while i was typing.

[tubeswell]

No, MTR L and R are for Meter left and Meter right. Note those two are at the input to the LED ladders for the VU meters. That signal comes from page 12, look for a couple JFETs between the CR/Phones faders.

Woe - my bad!

[Enzo]

If that unit is layed out like I think it is, the SMPS is a small enclosure in the bottom, with not enough wire to comfortably open the unit up to work on. I usually dismount the thing from the bottom and stick it out the side while working inside.

If the SMPS seems dead, try it without the mixer connected. If still dead, I always look for shorted rectifiers on the secondary first. UNlike a linear supply, where that blows fuses, on these it just causes a shutdown. Of course if the primary side switching transistor is shorted, then you replace a bunch of parts.

[Enzo]

Layed?


Laid, perhaps.


Them are tough to keep straight.

[tubeswell]

Layed?


Laid, perhaps.


Them are tough to keep straight.

;-)

[tubeswell]

If that unit is layed out like I think it is, the SMPS is a small enclosure in the bottom, with not enough wire to comfortably open the unit up to work on. I usually dismount the thing from the bottom and stick it out the side while working inside.

If the SMPS seems dead, try it without the mixer connected. If still dead, I always look for shorted rectifiers on the secondary first. UNlike a linear supply, where that blows fuses, on these it just causes a shutdown. Of course if the primary side switching transistor is shorted, then you replace a bunch of parts.

Thanks for the tip, I'll take a peek