QMS Magicolor 330 Manual page 194

 Caution: When moving the printer, do not reinstall the toner
cartridges that have been removed. Reuse will result in print
defects and toner smears. Toner can spill inside the printer,
resulting in malfunction.
1 Open the printer's front cover.
2 Remove the four toner cartridges.
a Press and release the antirotation switch to release the
knob lock.
b Turn the knob clockwise as far as it will go to move the next
toner cartridge to the cartridge opening.
c Turn the toner cartridge counterclockwise to unlock it.
d Remove the cartridge from the printer.
Once a toner cartridge has been removed from the printer, do
not reinstall it. Repeat steps a and b, c, and d to remove all
four toner cartridges.
Reset the antirotation spacer back into the toner cartridge window.