Solution
On MF4150, when the LCD displays [OUT OF TONER/CHANGE TONER], or toner level is low by pressing [Toner Gauge], redistribute toner in the toner cartridge. If the message persists, replace the toner cartridge.
On MF4122, when the printout has vertical white streaks, or toner level is low by pressing [Toner Gauge], redistribute the toner inside the cartridge. If the problem persists, replace the cartridge.
1. Lift the scanning platform (A) until it is locked, and open the printer cover (B).
(A): Scanning platform
(B): Printer cover
2. Remove the toner cartridge.
3. Gently rock the toner cartridge five or six times to distribute toner evenly.
4. Hold the toner cartridge by its handle.
The arrow (A) on the toner cartridge should be facing away from you and pointing down.
(A): Arrow
CAUTION
Do not open the drum protective shutter on the toner cartridge. Print quality may deteriorate if the drum surface is exposed to light or is damaged.
NOTE
Always hold the toner cartridge by its handle.
5. Align the protrusion (A) on the right side of the toner cartridge with the bottom edge of the guide (B) inside the machine, then insert the toner cartridge into the machine along the guide.
(A): Protrusion
(B): Guide
6. Push the toner cartridge to make sure it is properly set in the machine.
7. Close the printer cover and lower the scanning platform.
CAUTION
Be careful not to get your fingers caught.