# Help trying to resurrect an SQ-80 **URL:** \ **Category:** Synth Repair\ **Tags:** sq-80, ensoniq, no-audio\ **Created:** [December 24, 2025, 6:03am UTC](https://forums.syntaur.com/t/help-trying-to-resurrect-an-sq-80/9276 "2025-12-24T06:03:22Z")\ **Posts on this page:** 1\ **Showing post:** 6
**Author:** ![Travis](https://forums.syntaur.com/user_avatar/forums.syntaur.com/travis/32/1382_2.png) [@Travis](https://forums.syntaur.com/u/Travis)\ **Post date:** [December 27, 2025, 11:23pm UTC](https://forums.syntaur.com/t/help-trying-to-resurrect-an-sq-80/9276/6 "2025-12-27T23:23:13Z")
It’s normal for there to be a good amount of ripple on the display voltage (Vbb) in my experience. I don’t think yours is necessarily out of spec. 0.275 V out of 50 V is less than a 1% ripple so should be fine. The display offset should be a 9 VAC sine wave with a +8 to +11 V DC offset. So with the scope on DC make sure the middle of the sine wave is between 8 to 11 V. Or use a multimeter set to DC. [Power supply schematic](http://audiopro.r-massive.com/Ensoniq/Schematics/Ensoniq%20SQ80%20PSU%20schematics%20(600%20DPI).jpg) --- _[View the full topic](https://forums.syntaur.com/t/help-trying-to-resurrect-an-sq-80/9276)._