Canon LBP3900 Printer User Manual


 
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Close the front cover.
Close the front cover completely.
IMPORTANT
Make sure that the front cover does not open (make sure that there is no space
between the front cover and the printer and that the front cover is stable). If the
front cover is not closed completely, this may result in poor print quality.
If you cannot close the front cover, check if the toner cartridge is installed properly.
If you try to close the front cover forcefully, this may result in damage to the printer.
Do not leave the front cover open for a long time after installing the toner cartridge.