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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!
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on May 09, 2011
I got a yamaha FG180 guitar from a friend with only 2 strings on, so I shall put new strings on it, but I can't figure out the system on this one. How to put the strings on?
seems to be a standard acoustic setup to me. If it doesn't have all the string pins in it, you'll need to get some. you simply pull out the pin, put the string in, then wind it up on the machine heads (tuners) On this one you may need to put the strings through from the inside, I'm not sure about this particular model. I like a double wrap to start on the bass strings, but that's a choice I make. You could go with nylon strings, get ball end, they're easier to use than plain. It takes a bit of know how to do plain, thy have to be wrapped just right on the pins.
on Nov 02, 2019
How to clean contacts on yamaha p90 keyboard.
If you are talking about cleaning the rubber contacts I wouldn't bother. Once they start to fail then it is best to replace them. You can do this either for the octave giving problems or best to replace complete set. Main part is VY84670R your piano has 6 octaves of these. with a shorter part at either end.
on Oct 24, 2019
How do I fix my yamaha psr s750?
Try a master reset to start with.
Turn keyboard off
Turn on whilst holding down highest note on keyboard
Once screen display has complete release key
This will reset to factory settings.
If this doesn't work report back and we can maybe try other solutions.
Becketts Music Ltd
on Aug 23, 2019
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