Pioneer RMF-V4011R - Manual (Page 31)

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INSTALLATION AND ASSEMBLY
(10) Condensation
One problem that occurs in the winter season is "Condensation". When the temperature of the room in which the multi-
projection unit system is installed rises suddenly, condensation occurs on the screen and lens, thereby the system cannot
display its best performance. In such cases, turn off the power once, leave the system off for one hour, and turn on the power
again. Increasing the room temperature gradually is another method.