Brother International HL-5440D Basic User's Guide - English - Page 119
Cleaning the drum unit
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Routine Maintenance Cleaning the drum unit 5 If your printout has white or black dots at 3.7 in. (94 mm) intervals, the drum may have foreign material, such as glue from a label stuck on the drum surface. Follow the steps below to solve the problem. a Make sure that the front cover is closed and the power cord is plugged in. b Turn on the machine and wait until the machine is in Ready mode. c Press Go two times. The machine will print the drum dot check sheet. d Leave the machine turned on for 10 minutes for the internal fan to cool the extremely hot parts inside the machine. e Turn off the machine's power switch. 5 f Press the front cover release button and then open the front cover. g Take out the drum unit and toner cartridge assembly. 113