Samsung ml-7000 Guía Del Usuario

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Caring for Your Printer
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2. Pull up on the LSU cleaner and put it on the LSU.
1. Open the top cover and remove the toner cartridge.
3. Slide the LSU cleaner horizontally across a track on the top of the  
LSU.
Cleaning LSU(Laser Scanning Unit)
To obtain high quality from your printer, clean the LSU when
characters have lines running through them.
For more information on using method, see attached label on the
inside of the top cover.