Lexmark C720 Service Manual - Page 183
White Spot / Black Spot Service Check, Diagnostic Information
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5024-001 White Spot / Black Spot Service Check A white spot and black spot appears on the paper. FRU 1 OPC Belt Cartridge 2 Transfer Drum 3 Toner Cartridge 4 Transfer Unit Action Foreign particles adhering to the OPC belt or transfer drum. Remove the belt cartridge. • Lightly wipe off the foreign particles using a cotton cloth. • Replace the belt cartridge. OPC belt or transfer drum damaged. Open the transfer unit and check the transfer drum. • Lightly wipe off the foreign particles adhering to the transfer drum using a cotton cloth. • Replace the damaged transfer drum. Foreign particles mixed in the toner. Remove the toner cartridge. Foreign particles adhering to the transfer roller, or the transfer roller is deformed. Replace the transfer unit. Diagnostic Information 2-103
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