Lexmark T620 Service Manual - Page 148

4069-5XX/7XX Print Quality - Toner on backside of printed page Service Tip: This is generally caused by loose toner in the machine in the paper path being carried through the printer on the backside of the paper. FRU 1 Hot Roll Fuser Assembly 2 Transfer Roll Transfer Plate Assembly Action Toner is being carried out on the backside of the media. This problem is generally caused by a toner buildup on the fuser hotroll or backup roll. Check the fuser hotroll and backup roll for any noticeable buildup of toner. Repair as necessary. Check the transfer roll for any signs of toner buildup or loose toner around the area of the transfer plate assembly. Clean the area and run another copy. If the problem continues, replace the FRUs in the following order: HVPS system board 2-120 Service Manual