Question about Behringer UB2222FXPRO - Eurorack Ub2222fx-pro
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Posted on Jan 02, 2017
I will give you something to try and beyond that, you have to replace the fader.
Try spraying a LITTLE CRC 226 into the fader slot. Procure this at a Home Depot store in a small blue spray can in the electrical department. (about $2.60) DO NOT USE CONTACT CLEANER such as De-Oxit.
Spray a bit in and see if it improves the situation.
IF NOT what has happened is the sliding fingers have worn through and folded back and dug into the resistance element in the fader. That is fatal!
The faders, once you find the right type are not very expensive say less than $5 BUT there are usually massive number of screws to take out and knobs to remove to get the board out. SOMETIMES the ones you get have to have the "handle" shortened by a quarter inch. Do this with tin snips and clean off burrs with a file.
You need to match the resistance, the hole pattern, AND the "taper" which for those will be an "audio taper" The fader will have a part number on the side and MOST are made by "ALPS". Digikey and Mouser are my usual sources online.
Un-soldering the old fader takes care and solder removal tools. DO NOT force the leads out till the solder is all out and the lead is free. You will lift the circuit traces off the board.
Clean the residue of soldering flux when done and re-assemble.
Posted on Oct 27, 2009
It appears that both these use a 50K pot in the identical circuit and it is UNLIKELY they re-engineered very much so it is likely they use the same pot.
Behringer parts service should be able to tell you.
Posted on Apr 28, 2010
The utput fader has probably been broken. If the knob takes a hit, it breaks the resistance element. The part is inexpensive but it takes a lot of work to access and replace the part.
Posted on Jul 17, 2010
It is quite possible that you have bought a set that has a faulty preamplifier. The equaliser needs many such mixing preampflifer IC's mostly coupled together and it could be that there is a failure in one or several of the channels, the stages of the preamplifier. You must use a signal test to identify the faulty stage. You will need some help to go through these circuits and identify the op amps that are faulty. Try to check for voltage on the op amp stages and test with an audio signal for the section in fault. Hope you try. Good day.
Posted on Aug 11, 2010
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