QMS Magicolor WX User Manual page 208

c Remove the media from the transfer unit end of the printer.
d Close the transfer unit and the back cover.
e Push the OPC belt cartridge back into the printer until it
snaps into place. (The cartridge is in place when you can see
the green arrows on the left and right inside metal frame of
the printer.) Push down the green handle to lock the OPC
cartridge in place, and close the manual feed tray.
f Skip to step 5.