1. Empty the waste toner cartridge using a vacuum cleaner.
2. Toward the top right of the bay into which the waste toner cartridge fits, there is a recess. On the left side of the recess, there is a black rocker switch that is activated when the waste toner cartridge is inserted.
3. LEAVE THIS SWITCH ALONE. THERE IS ABSOLUTELY NO NEED TO DISABLE OR REMOVE THE SWITCH. It is there for a purpose -- to advise you when it is time to replace or empty the waste toner cartridge. If it’s not working, you either have to remember to check the cartidge all the freaking time, or run the risk of the thing filling to bursting point and beyond and filling your printer, and a wide area around it, with toner dust.
4. Find the protrusion on the cartridge that fits into the recess. If you are incapable of doing this, go back to kindgergarten and practice on lego.
5. Even if you have vacuumed almost all the dust from your waste toner cartridge, it may well be that this protrusion, which on its inside is small and narrow and a refuge from the air currents that sucked most of the cartridge clean when you vacuumed, is still full of toner dust.
6. THEREFORE, take a Q-Tip or contrive something similar, and bend it into a hook or U-shape. You will find that you can easily insert it into the cartridge through the hole adjacent to the protrusion, and wipe the inside of the protrusion clear of toner dust.
7. Now, replace the waste toner cartridge that you have vacuumed out and Q-tipped. The light sensor in the printer will now be able to shine through the protrusion in the waste toner cartridge.
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