When this code appears, the machine has detected that a specific motor (usually the Main Motor or a Drum Motor) isn’t spinning at the correct speed or has failed to start entirely. This stops all printing and copying to prevent mechanical damage. Primary Causes Mechanical Obstruction:
Inspect the encoder strip and sensors
The sensors monitoring the ink levels operate in a harsh environment (high heat, liquid wax). Contamination on an optical sensor or a stuck mechanical float can send a "False Positive" signal to the controller. Xerox Fault Code 043-343
The most common initial fix for logic mismatches is a full power reset. When this code appears, the machine has detected