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Your printer says a supply is low, and the supply turns out to be two different things: a toner cartridge and a drum unit. They sit together, they wear out at different speeds, they cost different amounts, and replacing the wrong one is the most common way printer owners waste money. This guide explains what each part does, how long each lasts, and the exact test that tells you which one your print problem is actually coming from. The 20-second version Toner cartridge: the container of toner po

Your printer was fine yesterday. Today every page has lines down it, or the text looks washed out, or there are dots marching down the margin in perfect formation. Print quality problems feel random, but they almost never are: each defect pattern points at a specific part, and most of them you can diagnose in ten minutes with nothing but a test page and a ruler. This guide works symptom by symptom. Find yours, run the test, and you will know whether the fix is two minutes of cleaning, a setting,