I have a boss OD-20. It functions normally except the write button, It used to function normally with sporadic not functionality. Now when its pressed, the write light will flicker but not blink as it should.

The interesting part is that I can reset the unit(unfortunately I lost all my presets that work) but that requires the use of the write button so the button itself works. Also If I set all the parameters to 0, or about <9 oclock the write function works perfectly well. as soon as any of the knobs get turned past about 9(its very little distance) I can no longer save. Changing the distortion type has no effect on the write button's functionality.

Its pretty late so I hope thats a halfway decent description. If anyone has any ideas as to the cause or repair I would greatly appreciate it. There are self test modes, but I havn't gotten to that stage yet.