Pioneer DJ DJM-300 Black Fader Maintenance The internal parts of the vertical and horizontal faders have been cleaned. The ALPS faders move very smoothly. Internal cleaning, panel removal, sponge washing, and cleaning of the knob bases were performed. All knobs are free of scratchiness or noise, and their movement has a moderate torque and is smooth. Headphone and microphone operation are good. All functions are in good working order on this DJM-300. We focused on genuine parts and finished the fader maintenance instead of replacing them with new generic parts. The genuine faders move very lightly and smoothly. #AlphaTheta #DJ Mixer #pioneerdj #Brimain Amplifier #Analog Mixer