MX-3500N, MX-3501N, MX-4500N, MX-4501N (serv.man21). User's Guide (Supplied as pdf file on m c's Hard Disk Drive). - Sharp Copying Equipment User Guide / Operation Manual. Page 59

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58
8
Clean the laser unit.
(1) Point the cleaner down and slowly insert 
the tool into the hole that you wish to clean.
Be sure to point the cleaner down.
(2) Insert the cleaning tool all the way into the 
hole and then pull it back out.
Pull the cleaning tool out until you feel the tip of the tool 
leave the cleaning surface of the laser unit.
(3) Repeat step (2) two or three times and then 
remove the cleaning tool.
9
Repeat step 8 to clean all holes in the 
laser unit (4 holes).
There are a total of 4 holes to be cleaned in the laser unit, 
including the hole cleaned in step 8. Clean all holes.
10
Push the waste toner box into the 
machine.
Push the waste toner box firmly in until it clicks into place.
Holes
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