Light brush and lots of vacuum, vacuum, vacuum to loosen and remove as much as possible. Use a true HEPA vac or your truckmount with a Dust-Downer. You don't want to spread this through the air.
Surround the stains with StainZone. Remove as much as possible with PIG and dry extraction. No water. If / when you don't get any further results, apply StainZONE. use according to directions.
That will work for most printer inks. However, the age of the stain, what the home-owner may have already tried and the condition of the carpet (protected or not, worn and abraded versus nearly new, etc.) will all effect the outcome.