Canon Satera LBP3900 User Manual page 79

● Move the transport guide back to its original position slowly.
4
Take the toner cartridge out of the protective bag.
There are cuts on both sides of the protective bag, so you can open it by hand.
IMPORTANT
78
CAUTION
Do not take your hands off the transport guide until it moves back to its
original position. The transport guide may snap back to its original
position, and this may result in personal injury.
Keep the protective bag for the toner cartridge. It may be required after taking out
the toner cartridge for printer maintenance.