Figure 5-8- Page 154

ROUTINE MAINTENANCE 5 - 5

HL7050_US_UG_FM5.5

5

Put the new toner cartridge firmly into the printer.   If you put it 
in properly, the blue lock lever will lift automatically. 

Figure 5-8

6

Close the top cover of the printer.

7

If the LCD shows CARTRIDGE ERROR, take out the toner 
cartridge and then put it back into the printer again.