Toner cartridges come with a warranty. You need to run a supplies status page from the information menu which will tell you the statistics of this particular toner. It should tell you how many pages have printed with this supply and how many pages remain. Since percentage cover is a factor if the page shows that you should have 5-15K more pages and it is printing bad, return to place of purchase for refund or exchange. Include a copy of the supplies status page.
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