How do I correctly install a toner cartridge in the MF1538C?
Shake the toner cartridge 5 to 6 times to evenly distribute the toner, then align it with the Toner Cartridge Guide and push it into the correctly color-labeled slot until it stops. Do not touch the drum surface, expose it to light, or touch the electric contact point or Toner Cartridge Memory during installation. (Pages 19-21)
From the official Canon imageCLASS MF1538C Multifunction Laser Printer manual, page 19
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