My sp540 is doing the exact same thing, only mine is black and cyan. I have to clean the encoder strip 3 times a day and it's spraying all over the inside. I replaced the dampers, no change. Now I know it's a bad head. I will be installing the new head today. My dealer wanted $1039 for a new head if I put it in myself. I found the dx4 head (brand new Roland) for $790. Good savings.