Question about Korg Cx3 61Key Modeled Combo Organ

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Sound problem with KORG CX-3 Combo Organ

Left side of keyboard will generate sound. First key pressed on the right side of the keyboard generates sound, but after that there is no sound (neither left nor right side of keyboard will generate a sound). I have to cycle power to get back to square one. The right side key has an attack, but left side key does not.

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  • Tim Hurd Dec 22, 2012

    I have looked at this for too long, and am pretty conviced this is a motherboard kind of problem.

  • Tim Hurd Dec 22, 2012

    I have discovered that the keyboard is split electronically, and the left side keys are handled by the lower tone generator, and the right side by the upper tone generator. The issue seems to be that when the right side of the keyboard is used, that initial key is processed (in fact, you can presss other keys and while the first one is still pressed, but when I release any of the right side keys, the organ freezes, and no longer processes any other keys, left or right. Scoping out the serial bus between the lowe and upper tone generator DSPs, I see the data bus just go into a loop, continuously sending the same pattern. This is clearly the problem, but I can't figure out what could be causing it. I ran the on-board diagnostics and reset things to the factory state, but to no avail. I suspect it needs a new motherboard, but I haven't found any source for one. Does anyone have any additional information or suggestions? Thanks.

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SOURCE: My Korg CX-3 Combo Organ

From the user manual troubleshooting:

No sound

• Are the other devices or headphones connected

correctly?

Check the connections. ........................................ (see p.6)

• Is the power of your amp or mixer turned on?

• Is the [MASTER LEVEL] knob raised?

• Is the Global mode Group 4 "MIDI Local" parameter

turned On?

Check the setting of this parameter.

• Are the bars of Drawbar 1 or 2 pulled out?
Pull out some of the bars.

Also check out this site and scroll down and do the "Factory reset" by holding down the buttons they say... AND please note that you have to hold them for a while during this.

Posted on Mar 09, 2011

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• Are the other devices or headphones connected

correctly?

Check the connections. ........................................ (see p.6)

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