Question about Yamaha Mg82cx Stereo Mixer
I have a TRS jack mic and I connected it to the mixer following all the instructions yet the peak indicator never flashed nor any sound had been recognized its basically not working for some reason and I have only head phones for right now.
SOURCE: I have a yamaha Emx312sc
This symptom indicated that you have a faulty OpAmp IC in the Mix circuit board. The IC's involved is the NJM2068M-D and NJM4558M-D. If I'm not mistaken you have more than 15pcs of this IC's in the circuit board that control the mics inputs. This is a 8-pin IC in D package. You must have at least 2 good IC's spare if you are going to DIY to swap or compare the reading of each IC's in the board.
Also, bad solder joints must be consider in that board and in the power supply feeding this board. Check it first, this is hard to spot, I would advice you to work in the brightest area or used table/portable lamp and magnifying glass. Re-solder as much as possible.
Let me know if you need further assistance.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.
Posted on May 09, 2011
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