# Alesis s4 plus - trying to troubleshoot

**URL:** <https://forums.syntaur.com/t/alesis-s4-plus-trying-to-troubleshoot/4231>\
**Category:** Synth Repair\
**Created:** [April 21, 2022, 4:01pm UTC](https://forums.syntaur.com/t/alesis-s4-plus-trying-to-troubleshoot/4231 "2022-04-21T16:01:03Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![toofy](https://forums.syntaur.com/user_avatar/forums.syntaur.com/toofy/32/1052_2.png) [@toofy](https://forums.syntaur.com/u/toofy)\
**Post date:** [April 21, 2022, 4:01pm UTC](https://forums.syntaur.com/t/alesis-s4-plus-trying-to-troubleshoot/4231/1 "2022-04-21T16:01:03Z")

</div>

So I got a used s4 + that has some problems. While it responds to MIDI, and I can switch patch from the page and bank buttons, I am having problems with the GLOBAL and MIX buttons - hitting them both does not start the DEMO, Switching from patch to mix doesn’t work. I tried reseating the flat cable at both sides, cleaning connect with deoxit, etc.

Any ideas? Any S4 + repair manual out there?