Posted by Seppuku on January 11, 2007 at 23:13:05:
In Reply to: Erratic changes with Volume / Quad Knob Values on Original QS posted by Gary on March 30, 2006 at 11:45:06:
: I have owned an original QS keyboard for many years and for around the last year a few of the 4 quad knobs have started behaving erratically and seem to have a life of their own...
: First of all the volume goes really quiet when you are playing they keyboard (but not when triggered via midi playback) and then cycles loud again.
: The quad knobs seem to keep changing the patch parameters without me even touching them (It's not MIDI controlling them either). I can actually see them changing the values on the LCD without any form of input on the Synth.
: Has anyone else experienced similar problems? I know the synth is getting old now and it's probably some kind of hardware failure but would be nice to know if it can be fixed or whether it's time to invest in a new synth.
: Thanks for you help!
It sounds like you have a loose cable. Open the device and look for a label on the main board called "POTS". There will be a the smallest ribbon connected to it. Unplug it and plug it back in. Trace the cable to the LCD panel and check that connect as well. If you still have problems you may have a large build up dust in the actual sliders/POTS themselves.
PS, make sure the power is off and unplugged