Question about Dell 2155cn mfp clr laser p/s/f/c prnt usb enet 600dpi 512mb 24ppm du
Makes knocking noise while printing
Posted by Anonymous on
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Posted on Jan 02, 2017
This is a good thing. The 'knocking' noise is actually called a "Thumper". It's purpose is to get the air out of the envelope before it hits the fuser. Air in the envelope typically leads to creases on the envelope itself.
Posted on Feb 27, 2009
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