Epson PowerLite 1715c - Manual (Page 150)

150 Maintaining the Projector
8. Push down the corner marked PUSH until it snaps in.
9. Once the lamp is fully inserted, tighten its screws.
10. Replace the lamp cover, then tighten its screw.
11. Turn the projector over.
12. Slide the air filter out and remove it.
13. Slide in the new air filter until it clicks in place.
14. Reset the lamp timer as described in the next section.