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Main motor lock error
Failed to detect main motor lock signal for 7 checks in succession (total of 700ms) after main motor started to rotate, or after last lock signal was detected.
Main motor defective
Too much load on the drive mechanism
Motor driver damaged
Have the service people set the machine to add toner(per pixelcount) and test run it for a day or two. If this works it means the sensor in the developer unit that tells the machine to add toner from the cartridge is bad. If that is the case replace the sensor. It sounds like the machine is not adding toner to itself. Have them also test the toner motor.