# Yet another SQ80 Problem

**URL:** <https://forums.syntaur.com/t/yet-another-sq80-problem/227>\
**Category:** Synth Repair\
**Created:** [August 27, 2018, 4:23am UTC](https://forums.syntaur.com/t/yet-another-sq80-problem/227 "2018-08-27T04:23:24Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Woolaboo](https://forums.syntaur.com/user_avatar/forums.syntaur.com/woolaboo/32/62_2.png) [@Woolaboo](https://forums.syntaur.com/u/Woolaboo)\
**Post date:** [August 27, 2018, 4:23am UTC](https://forums.syntaur.com/t/yet-another-sq80-problem/227/1 "2018-08-27T04:23:24Z")

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Hi again!

Found another issue with my SQ80…

I think there is an issue with the aftetouch on a single key. It is fully modulated every time I stike it. Is there any way to disable the after touch in the keyboard settings? Also how could I fix this?

\*\* note I’m still having an issue with the digital noise in my earlier post. I thought it could be the after touch, but I used my DX7 as a controller to the SQ80 and still had the same noise problem. The modulation Problem was resolved by using the DX7 as a controller, but I would like to fix the SQ80 ha

Thanks again!

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**Author:** ![knobtwiddler](https://forums.syntaur.com/user_avatar/forums.syntaur.com/knobtwiddler/32/85_2.png) [@knobtwiddler](https://forums.syntaur.com/u/knobtwiddler)\
**Post date:** [August 27, 2018, 5:31am UTC](https://forums.syntaur.com/t/yet-another-sq80-problem/227/2 "2018-08-27T05:31:52Z")

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Some steps I would try would be to swap that key with the same note from another octave to see if it could be the key itself. A keyboard connector issue is another possibility. I see in the schematics that the pressure circuitry for each key consists of a resistor, transistor, and coil. An open or shorted transistor sounds like a likely candidate. I believe some of that circuit is on the “poly pressure keyboard” circuit board.

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**Author:** ![Sam](https://forums.syntaur.com/letter_avatar_proxy/v4/letter/s/5f9b8f/32.png) [@Sam](https://forums.syntaur.com/u/Sam)\
**Post date:** [August 28, 2018, 9:48pm UTC](https://forums.syntaur.com/t/yet-another-sq80-problem/227/3 "2018-08-28T21:48:03Z")

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On the MIDI page, you can set PRESS = OFF - that will disable aftertouch both locally and via MIDI.

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**Author:** ![Woolaboo](https://forums.syntaur.com/user_avatar/forums.syntaur.com/woolaboo/32/62_2.png) [@Woolaboo](https://forums.syntaur.com/u/Woolaboo)\
**Post date:** [September 2, 2018, 5:51pm UTC](https://forums.syntaur.com/t/yet-another-sq80-problem/227/4 "2018-09-02T17:51:46Z")

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Sam, thank you! It’s an after touch problem. Disabled per your direction and it fixed it. As cool as it is, I never press the keys hard enough to use it, so I’ll keep it disabled. Thanks!!