Lexmark X500n Service Manual - Page 103
White spot / black spot service check
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White spot / black spot service check 7100-XXX A white spot and black spot appear on paper. Problem area 1 Photodeveloper cartridge 2 Transfer belt unit 3 Toner cartridge 4 Transfer roller Action There are foreign particles adhering to photodeveloper OPC belt. Remove photodeveloper cartridge (see "Photodeveloper cartridge removal" on page 4-8). Lightly wipe off foreign particles using a cotton cloth. If problem persists, replace photodeveloper cartridge. There are foreign particles adhering to transfer belt unit. Remove transfer belt unit (see "Transfer belt unit removal" on page 4-5). Lightly wipe off foreign particles using a cotton cloth. If problem persists, replace transfer belt unit. Foreign particles mixed in toner. Replace toner cartridge. There are foreign particles adhering to transfer roller, or transfer roller is deformed. Replace transfer roller. See "Transfer roller removal" on page 4-6. Diagnostic information 2-65