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Check that the printer is on a hard, level surface.
Reinstall the OPC belt cartridge. If necessary, replace the
OPC belt cartridge.
One or more toner cartridges may be defective.
Check the toner cartridges, and install new ones, if
necessary.
If a wide horizontal white line appears,
Ensure that the transfer unit was closed.
Replace the transfer roller.
If there is insufficient gloss of the printed image,
Check the fuser oil condition.
If there is insufficient fusing and the image comes off when
the printed image is rubbed,
Check your media type—envelopes, glossy stock, labels,
transfer media, and thick stock have to be set in the thick
stock mode.