Chapter 1 Preparation — Precautions for useENGLISH - 19f Prevent hot and cool air from the air conditioning system to blow directly to the ventilation ports (intake and exhaust) of theprojector.+15°- 15°100 mm (4") or longer500 mm (20") or longer 1 000 mm (40") or longer1 000 mm (40") or longerf Do not install the projector in a confined space.When installing the projector in a confined space, provide air conditioning or ventilation separately. Exhaust heat mayaccumulate when the ventilation is not enough, triggering the protection circuit of the projector.SecurityWhen using this product, take safety measures against the following incidents.f Personal information being leaked via this productf Unauthorized operation of this product by a malicious third partyf Interfering or stopping of this product by a malicious third partyTake sufficient security measures. (x pages 104, 121)f Make your password difficult to guess as much as possible.f Change your password periodically.f Panasonic Corporation or its affiliate companies will never ask for your password directly. Do not divulge your password incase you receive such inquiries.f The connecting network must be secured by a firewall, etc.f Set a password for the web control and restrict the users who can log in.DIGITAL LINK(Only for PT-EZ580, PT-EW640 and PT-EX610)“DIGITAL LINK” is a technology that uses a twisted-pair-cable to transmit video, audio, Ethernet, and serial control signals.The projector supports the optional Digital Interface Box (Model No.: ET-YFB100G) and the “XTP transmitter” of ExtronElectronics. For the twisted-pair-cable transmitter of other manufacturers of which the operation has been verified with thisprojector, refer to Panasonic website (http://panasonic.net/avc/projector/). Note that the verification for devices of othermanufacturers has been made for the items set by Panasonic Corporation, and not all the operations have been verified. Foroperation or performance problems caused by the devices of other manufacturers, contact the respective manufacturers.Cautions on userTo get a good picture qualityf In order to view a beautiful image in higher contrast, prepare an appropriate environment. Draw curtains or blinds overwindows and turn off any lights near the screen to prevent outside light or light from indoor lamps from shining onto thescreen.rDo not touch the surface of the Projection Lens with your bare hands.If the surface of the Projection Lens becomes dirty from fingerprints or anything else, this will be magnified and projected ontothe screen.Attach the lens cover supplied with the projector or the optional Projection Lens when you do not use the projector.