使用投影仪要注意防尘通风：由于投影机一般有专用风机进行送风制冷，高速气流通过滤尘网后可能携带小粉尘颗粒，相互摩擦产生静电，吸附在成像和光学系统中，影响投影图像。不要关闭电源：投影机关闭后不能马上关闭电源，因为投影机关闭后机器内的温度依然很高，其散热系统仍在工作，马上关闭电源会使热量无法传播，损坏机器。
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