Chapter 22-8F-2-21Be sure to shift down the locking lever until it is fully horizontal;otherwise, no supply of toner will be made.2.2.3 Installing the Drum Unit 0006-6766iR2270 / iR2870 / iR3570 / iR4570 / / iR2270N / / iR2870N / / iR3570N // iR2230 / / iR3530 / / / /1) Remove the two screws [1] and detach the front cover unit [2] as slidingit to the left.F-2-222) Remove the waste toner box [1].F-2-233) Open the right door [1].F-2-244) Remove the lock screw[1] of the developing assembly pressure lever.F-2-255) Turn the developing assembly pressure lever [1] to the left and release thepressure.F-2-266) Remove the one screw [1] and take out the dummy drum [2].F-2-27F-2-287) Remove the package of the drum unit, which is provided with the product,and remove the two drum pressure release blocks [1].