Remove the two screws from the back cover, unplug the power and transducer jacks from the PC board, and remove the back cover. Next, remove the control knobs from the front of the case (the allen size is 1.5mm). Remove the four screws that hold the PC board in place and remove the board.

Using compressed air, blow out all of the brush dust from in and around the wheel assembly and wash the front case, inside and out, with soap and water.

To clean the brush contacts, make a tool by stapling a small piece of fine sandpaper to the end of a popsicle stick. Connect the rear case power jack to the PC board and turn the unit on. Be careful of the spinning wheel! Insert the tool you made between the board and the spinning wheel. Clean the three brass rings until they are shinny. Clean the three brass rings until they are shinny. Run the unit for at least 30 minutes at room temperature to re-seat the brushes. This should increase your light intensity to where it was when the unit was new.

If the brush contacts are worn significantly, you should replace them. You can order a brush kit here. Be sure to read the instructions available before you order, so you are sure you can do the job.

If you want to send it in for us to do, it will cost you around $70 plus shipping and it will be here for about five days.