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  1. petter
  2. MODX Series Synthesizers
  3. Saturday, 27 February 2021
Hi!

I bought a used MODX8 last year, and at some point (exact date I can't recall) the system output stopped working properly. By that I mean the stereo signal that is sent to both the L/R and headphone physical outputs is sending the left signal at a set level constantly, regardless of the master volume knob, while the right signal is controlled by the knob. Even at full, the right doesn't output as much as L. I thought this was an issue with either the outputs, the cables, interface, mixer or speakers, but after eliminating all of those possibilities, I noticed the same behaviour in the headphones, mirroring what happens with the L/R outputs (which also eliminates the possibility of left only sending mono). I've checked the board and the manual, factory reseted it, updated firmware, double checked everything. There has to be something wrong with either a connection or some digital component/setting that's outside of the "brain" of the board, but before the physical outputs.

Has anybody had this experience that can help me out? I guess I probably have to open it up, but what to look for and what to fix, I have absolutely no clue. I'm currently in another city until summer, so can't actually open it before then, but all the info I can get until that is very welcome :)
Responses (2)
Bad Mister
Yamaha
Accepted Answer Pending Moderation
Has anybody had this experience that can help me out? I guess I probably have to open it up, but what to look for and what to fix, I have absolutely no clue. I'm currently in another city until summer, so can't actually open it before then, but all the info I can get until that is very welcome :)
I can tell you that just opening the unit and looking inside will give no more insight into the problem. I would immediately take it to an authorized service center... you purchased it used so you are not entitled to warranty service, but it should be looked at by an authorized service technician. They will be able to determine what is wrong with the instrument, and then you can make an informed decision as to what you want to do. But don’t wait, reach out for help, now.

Contact your regional Yamaha distributor (listed in the back of your owner’s manual)... or use the Service Locator on the main Yamaha.com site.
You can call Yamaha or the Service Center directly.

Question: Have you been using the Official Yamaha PA150 Power Adaptor?
  1. more than a month ago
  2. MODX Series Synthesizers
  3. # 1
Accepted Answer Pending Moderation
A bad volume pot or a bad solder joint on the ground pin on the volume pot can cause this.

A Yamaha repair tech should be able to take care of it easily.
  1. more than a month ago
  2. MODX Series Synthesizers
  3. # 2
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