11. Gently wipe the LED head surface with soft tissue.
To avoid toner wastage and possible toner sensor
errors, do not change the toner cartridge(s) until
"TONER EMPTY" is displayed.
12. Finally, close the top cover and press down firmly at both
sides so that the cover latches closed.
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CAUTION!
– VarioLink 3550cp Series User's Guide
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