NEC PX-50XM4 series Service Manual page 252

CONFIDENTIAL
(3) Blinking in red (Alarm of temperature error)
Since the internal temperature is too high in the product, the temperature protector has been actuated. In such
a case, the following actions should be taken immediately:
1. Turn off the main power supply and pull out the power cord from the wall outlet.
2. Wait for about 60 minutes until the temperature in the main unit lowers.
3. Check whether the heat discharge port is covered with dust or the like. If yes, remove the clogging substance.
4. If the unit is used where the ambient temperature is high, it should be moved to an adequate place (air
temperature ranging from 5°C to 35°C).
5-5