QMS Magicolor WX User Manual page 143

5 Remove the black light-shield paper from the OPC belt by
pulling the tab on the front.
6 Firmly slide the cartridge the rest of the way into the printer
until it snaps into place. It is in place when you can see the
green arrows inside the metal frame of the printer.
7 Turn the green end-handle on the cartridge down to close it
and lock the cartridge in place.