Lexmark M410 Service Manual - Page 73

4045-XXX 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 Fuser Assembly 2 Transfer Roll 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. Clean the area and run another copy. If the problem continues, replace the FRUs in the following order: HVPS engine board Serial Port Service Check Run the "Serial Wrap Test" on page 3-11. Note: The Serial Wrap Test is designed to check the serial port hardware by using a wrap plug (P/N 1329048) and invoking the Serial Post Diagnostic Test. The test helps isolate the printer from the serial cable and host. The test provides failure information on the display for approximately three seconds. If the test indicates a problem, replace the controller board. Diagnostic Information 2-47