Принтер выдает ошибку. Принтер brother dcp-6690cw выдает ошибку 70. В чем может быть причина?

Error 70,71
Symptom - Cannot detect the ON/OFF state of cap lift cam switch.
Probable Cause - Solution - Cap lift cam switch defective - Replace the maintenance unit.
ASF encoder sensor defective; ASF motor defective - Replace the ASF motor ASSY.
Main PCB defective - Replace the main PCB.