BEHRINGER KX1200 Keyboard Amp problems.

[Enzo]

Near you I see Behringer service centers in:

WOodbridge

Deltronics
2003 W. 75th Street
Woodridge, IL 60517
Phone: 630-910-6630

and West CHicago

Electronic Express
1809 E. Fabyan Parkway
West Chicago, IL 60185
Email: eeservice@sbcglobal.net
Phone: 630-208-4600
Fax: 630-208-4601


A lot closer than I am.

[Chuck C]

I'm currently doing a repair on this same amp- and funny thing- that same line on the control panel pc board is burned up with part of it pulled up looking like schrapnel! one of the 074C quad op amps nearby is also crispy with a nice burn mark! I'm wondering if the destroyed trace is an in-house mod at Behringer, a faulty part, or the result of poor design. either way, i've got to fix this thing! Eduard, did you get yours to work?

[Jazz P Bass]

Can you identify which op amp & which pc trace?
Attached is the schematic.

[Enzo]

When traces burn off the boards, it is often a ground trace, but whatever trace it is, it usually is the result of something wrong being plugged into the jacks. Usual suspects include the output of some amp plugged into the input of another. And also connecting two pieces of gear with one having a hot chassis.

[Chuck C]

Can you identify which op amp & which pc trace?
Attached is the schematic.

It's IC7 - i think pin 3 is the most fried, if i'm not mistaken. thanks for the schematic!

[Chuck C]

When traces burn off the boards, it is often a ground trace, but whatever trace it is, it usually is the result of something wrong being plugged into the jacks. Usual suspects include the output of some amp plugged into the input of another. And also connecting two pieces of gear with one having a hot chassis.

thanks! i've messaged the amp's owner asking if something as such had been plugged into it. the blown trace is the same one as pictured in this thread.

[J M Fahey]

1) I would have replaced *both* LM3886, because things might have been the opposite of what they appeared to be, as in the hot 3886 might be the good one, trying to do its job and that of a dead partner.
2) that said, it was funny to read this line, straight from the manual

Short-circuit-proof and “indestructible” power amp with 2-stage fan

[Chuck C]

1) I would have replaced *both* LM3886, because things might have been the opposite of what they appeared to be, as in the hot 3886 might be the good one, trying to do its job and that of a dead partner.
2) that said, it was funny to read this line, straight from the manual

I think I would expect some components to let off some heat- as these parts have heat sinks on them (the metal tab?), right? the quad op amps i ordered just came in today- so, i'll see what happens…

Silly, Behringer! that manual is just full of laughs, i bet!