Your problem in the developer unit parts.Please cleane the unit and process the auto process control and the developer initialization settings,Clean the charge corona roller and the transfer belt,and see the used toner bottle(located under transfer section).
Sc542
• ID sensor defective
• ID sensor connector defective
• Poor ID sensor connector connection
• I/O board (IOB) defective
• High voltage supply board defective
• ID sensor dirty
• Defect at ID sensor pattern writing
area of the drum
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