Lexmark T430 Service Manual - Page 89
Toner on back
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Toner on back of page 4048-1xx FRU Print cartridge (not a FRU) Fuser assembly Transfer roller Action Inspect the overall paper path for signs of spilled toner. Gently clean the contaminated areas with a soft cloth. The fuser belt can deposit toner on the back of the paper if toner is building up on the belt edges. This buildup may transfer to the backup roller, later transferring to the back of the paper. Inspect the belt and backup roller for signs of contamination, and replace fuser assembly as necessary. A transfer roller contaminated with toner can cause toner to transfer to the back of printed pages. Inspect the transfer roller for contamination and replace as necessary. Note: Always check the bottom margin following a transfer roll replacement. See "REGISTRATION" on page 3-4 Diagnostic information 2-55