Nokia IP740 Installation Guide - Page 29
Monitoring and Replacing a, Power Supply on Nokia Contact, Information
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Connecting Power and Turning the Power On The power supply fans are on when the power supply switch is turned on. Verify that the power supply fans are running after you press the switch. You can check the LEDs on the back of each power supply to ensure that they are both operating correctly. Most importantly, only the left LED (Power OK) should be illuminated on each power supply. For more information about the LEDs, see "Monitoring and Replacing a Power Supply" on page 61. 3. If the power supply fans are not running, check the power supply cord to make sure it is properly connected. If the fans are still not running after this check, contact technical support. See "Nokia Contact Information" on page 3 for more information. IP700 Series Installation Guide 29