HP Laserjet 1200 - Manual (Page 127)

EN Cleaning the printer 125
Cleaning the printer
During the printing process, paper, toner, and dust particles can
accumulate inside the printer. Over time, this buildup can cause
print quality problems, such as toner specks or smearing. To
correct and prevent these types of problems, you can clean the
toner cartridge area and the printer media path. See the following
sections for more information:
● Cleaning the toner cartridge area
● Cleaning the printer media path