Sometimes the drum gets dirty with grease, stickers or something else.
To clean it, often it is not necessary to remove the drum from the cartridge.
you can clean the OPC without removing it.

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other links:
http://www.emmegiricambi.it/
http://www.samsung.com/it/consumer/pc...
http://store.hp.com/us/en/cat/printers
http://www.brother-usa.com/printer/#....