hp Color 9850mfp EXTERIOR 1.2 Replacing the dust filter 1 and the ozone filter 1 A. Periodically replaced parts/cycle • Dust filter 1: Every 100,000 copies • Ozone filter 1: Every 100,000 copies B. Procedure 1. Loosen 4 screws [1] and remove the side cover 2 [2]. [1] III DIS./ASSEMBLY [1] [2] 2. Pull out the filter replacement duct [1]. [1] 3-3