Oki PRINTER MPS420B - Manual (Page 50)

Consumables and Maintenance > 50
11. Pressing gently down on the cartridge to ensure that it is firmly seated, push the
colored lever towards the rear of the printer (8). Push the lever all the way
forward until the pointers on the drum and the toner are aligned (8a). This will
lock the cartridge into place and release toner into the image drum unit.
12. Gently wipe the LED array surface (9) with a soft tissue.
13. Close the top cover and press it down to latch it closed.
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8a
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