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Your laser printer recently began printing a vertical black line near the edge of every printed page. What should you do to resolve this problem?
Answer: Replace the toner cartridge. Toner, the laser equivalent of ink, is a fine powdery mixture of pigment typically made from iron or carbon and an easily melted polymer or wax binder. When the toner cartridge is almost empty, the laser printer may begin to print a black line on the side of each page. Another cause of vertical black lines is a scratch on the drum. The cartridge contains the drum.