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Install new toner cartridges.
Remove the toner cartridges and gently rock them
horizontally five or six times to redistribute the toner. Then,
reinstall the cartridges.
One or more toner cartridges may be defective. Check the
toner cartridges, and install new ones, if necessary.
Check your media type—envelopes, glossy stock, labels,
transfer media, and thick stock have to be set in the thick
stock mode.