NEC WT615 - Manual (Page 25)

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2. Installation and Connections
Ambient environmental condition
• Do not place the screen near vents.
Air movement hitting the screen, causing the projected image to ripple.
• Do not illuminate the projector with strong light sources such as halogen lamp.
Doing so can cause the object detection sensor to malfunction, resulting in the projector not turning on.
Precautions for using the electronic pen (WT615 only)
• Use a hard-surface screen because you tap the screen using the electronic pen. Supported screen sizes are 40
to 80" (101.6 to 203.2 cm).
• Keep in mind that the electronic pen tip can cause scratches on the screen surface as the pen tip is made of
hard material.
• Do not use the electronic pen under the following conditions. Otherwise, the electronic pen may not work
properly.
- Near a device such as a CRT monitor or a TV set.
- In a room with the ceiling and walls made of metal which is prone to reflect sound waves.
- In a noisy place or a place where loud sounds can be heard
- In direct sunlight or near an inverter fluorescent lamp.
- Near an air conditioner or air blower
• Do not hold any part ahead of the black ring part of the electronic pen. Otherwise, the electronic pen may not
work properly.
• Do not use two or more electronic pens and projectors at the same time in the same room. Be sure to use the
electronic pen and the projector on a one-to-one basis.
• Operational temperature for electronic pen is 59
° to 95°F (15° to 35°C).