QMS Magicolor 330 Manual page 94

    Caution: Never touch the surface (blue part) of the drum.
Never hit or rub the drum surface: if the OPC drum is scratched,
printing will be degraded.
The OPC drum is extremely sensitive to touch. Any body oil left on the
surface of the drum will prevent toner from adhering to the drum
which results in poor image quality. Any scratches will show in the
image produced.
The OPC drum is also extremely sensitive to bright light and direct
sunlight. Always leave it in its protective bag until you are ready to
install it. Any exposure to light should be limited to two minutes.
If you suspect the drum is damaged due to exposure to light, put the
drum in a dark place to recover. Depending on the amount of expo-
sure, recovery may take up to two hours. Recovery time is dependent
on the amount of exposure sustained. However, recovery is not
guaranteed.
1 Turn off and unplug the printer.
2 Open the printer's front cover.
3 Release the two OPC drum
lock levers to the Unlock
position.