Clean the outside of your pc's printer with Simple Green or another
similar cleaner.
Check the fan. It's important to check the operation of the
fan while the printer is running. Some fans run only after the
printer gets hot, so testing this may take some time. A stopped
fan will cause a gradual overheating condition that is serious,
but not instantly fatal to the printer.
Blow dust out of the printer only if there is no major toner
spill.
Clean out toner spills. Toner — especially color laser toner
— is hazardous to your health.
If you have to vacuum the printer out, use a toner vacuum with a
micro-toner filter like the ones made by 3M.
Check and replace the fuser wand that is usually marked with
word "Hot." Caked-up toner on this wand will destroy
your printer's fuser and cause image defects.
Clean the ozone filter. In most laser printers this filter is
made of carbon. If there is a lot of dust on this filter you can
order a new one to replace it. If a new filter is not available,
simply remove it and blow out the dust with canned air.
Clean the roller. There are two types of rollers in printers:
hard plastic and rubber. Plastic rollers can only be cleaned
with alcohol. Rubber rollers can be cleaned with Goof-Off, which
is available at most office supply stores. It smells awful, but
works well to rejuvenate rubber rollers. Try not to get Goof-Off
on any plastic parts, as it will damage them.