What the thread found

• Chattering in an FMG.6 motor is typically caused by deterioration or contamination of the potentiometer, which causes the motor controller to receive inconsistent position signals and oscillate between values.
• Cleaning the potentiometer with DeoxIT or Servisol super 10 fader and switch cleaner may resolve chattering, though the potentiometer tracks can flake off during cleaning if severely damaged.
• Contact cleaner can successfully restore proper motor function when internal components have become dirty or oxidized.
• Applying grease inside an FMG.6 motor to the clutch or other components can permanently damage the motor beyond repair.

Depends on

• The original potentiometer for the SLD-100 is discontinued and may not be available for replacement.
• Success of cleaning depends on the severity of potentiometer deterioration; severely damaged potentiometers may not be salvageable.
• Opening and repairing the FMG.6 motor requires careful handling to avoid losing small parts like grub screws and to avoid applying lubricants to components that should remain dry.
• The discussion occurred in 2012 and involved a motor model that was already considered redundant at that time.

Parts

Follow Focus

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