Fulltone Deja-Vibe MDV-2 factory error
Posted: 10 Jun 2023, 20:54
Hello everyone. I have a 2009 fulltone MDV-2 in for repair and the symptoms were: the chorus setting was full volume, and the vibrato setting was much lower in output. I've seen this complaint on the web before with no solution provided.
Both settings the modulation wasn't strong and got weaker when the rate was maxed.
I have found the cause: fulltone built their pedal wrong.
In this unit at least the chorus/vibrato switch was labeled backwards, and the output mixer had very 'none original' values in it. Causing the dry mix in the chorus setting to be unbalanced and weak in modulation and the vibrato setting to be quieter. Attached is a pencil drawing of the issue
Not a clue where these values came from as they are not on any schematics attached to the original Uni-Vibe at all.
As an aside this was a simple repair made difficult by the narrow PCB hole sizes and thick PCB. It's a very crowded board with no labeling either. Also the Bulb was covered in hot glue and touch the roof of the shield so it was resoldered to be in the middle of the box
Both settings the modulation wasn't strong and got weaker when the rate was maxed.
I have found the cause: fulltone built their pedal wrong.
In this unit at least the chorus/vibrato switch was labeled backwards, and the output mixer had very 'none original' values in it. Causing the dry mix in the chorus setting to be unbalanced and weak in modulation and the vibrato setting to be quieter. Attached is a pencil drawing of the issue
Not a clue where these values came from as they are not on any schematics attached to the original Uni-Vibe at all.
As an aside this was a simple repair made difficult by the narrow PCB hole sizes and thick PCB. It's a very crowded board with no labeling either. Also the Bulb was covered in hot glue and touch the roof of the shield so it was resoldered to be in the middle of the box