Make certain you have read the ViewSonic MANUAL FOCUS & ZOOM DIGITAL KEYSTONE CORRECTION manual thoroughly before attempting the ViewSonic MANUAL FOCUS & ZOOM DIGITAL KEYSTONE CORRECTION bulb replacement on your ViewSonic MANUAL FOCUS & ZOOM DIGITAL KEYSTONE CORRECTION. Without touching the surface of the ViewSonic MANUAL FOCUS & ZOOM DIGITAL KEYSTONE CORRECTION lens, remove the lens tube and set it aside. Write down the number from inside the tube's inner lip for the purpose of make, model or serial number for any future need to buy ViewSonic MANUAL FOCUS & ZOOM DIGITAL KEYSTONE CORRECTION replacement parts. Your bulb should be sitting just beyond the opening of the ViewSonic MANUAL FOCUS & ZOOM DIGITAL KEYSTONE CORRECTION body. Reach in with two fingers and disconnect the ViewSonic MANUAL FOCUS & ZOOM DIGITAL KEYSTONE CORRECTION bulb. Reverse these steps to re-assemble your ViewSonic MANUAL FOCUS & ZOOM DIGITAL KEYSTONE CORRECTION. This concludes the ViewSonic MANUAL FOCUS & ZOOM DIGITAL KEYSTONE CORRECTION review - be sure to read the entire ViewSonic MANUAL FOCUS & ZOOM DIGITAL KEYSTONE CORRECTION manual.