QMS Magicolor 6100, Operation Manual

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Remove the toner cartridges and gently rock them five
or six times to redistribute the toner. Then, reinstall the
cartridges.
Install new toner cartridges.
Reinstall the OPC belt cartridge. If necessary, replace
the OPC belt cartridge.
The laser lens may be dirty. Clean the lens as described
in chapter 2, “Every Day Operations and Printer Care.”
The corona wire inside the OPC belt cartridge might be
dirty. Clean the corona wire as described in chapter 2,
“Every Day Operations and Printer Care.”
One or more toner cartridges may be defective. Check
the toner cartridges, and install new ones, if necessary.
Reinstall the OPC belt cartridge. If necessary, replace
the OPC belt cartridge.
If a wide vertical white band appears:
Check the transfer drum surface. If necessary, clean the
oil off the surface.
Ensure that the transfer unit is closed.