Juniper MX240 Hardware Manual page 388

9. Replace the clear plastic cover over the terminal studs on the faceplate.
10. Verify that the power cabling is correct, that the cables are not touching or blocking access to router
components, and that they do not drape where people could trip on them.
11. Verify that the INPUT OK LED on the power supply is lit green.
12. On each of the DC power supplies, switch the DC circuit breaker to the center position before moving
it to the on (—) position.
NOTE: The circuit breaker may bounce back to the off (O) position if you move the breaker
too quickly.
Observe the status LEDs on the power supply faceplate. If the power supply is correctly installed and
functioning normally, the PWR OK, BRKR ON, and INPUT OK LEDs light green steadily.
NOTE: If more than one power supply is being installed, turn on all power supplies at the
same time.
NOTE: An SCB must be present for the PWR OK LED to go on.
Figure 136: Installing a DC Power Supply in the Router
392