Replacing Hardware Components
Figure 102: Rear of Power Supply Showing Midplane Connectors
Power supply
input connectors
1224
Power supply
output connectors
Installing a Power Supply
To installa power supply, follow thisprocedure (see Figure 103):
1. Verify that there is no power flowing to the power supply from the external
power source, so that the voltage across the leads of the power cables is 0 V.
Ensure that there is no chance that the cableleads might become active
during the procedure.
2. Verifythat the power switch for the power supply (locatedon the circuit
breaker box) is in the OFF (O) position.
3. Attach an electrostatic discharge (ESD) grounding strap to your bare wris t and
connect the strap toone of the ESD points on the chassis. Make sure the router
is attached to a proper earth ground. For more information about ESD, see
“Preventing ElectrostaticDischarge Damage” on page 226.
4. Place one hand under the power supply and grasp a handle on the faceplate
with the other hand. Slide the power supply into the chassi su ntil it contacts
the midplane.
5. Starting with the bottom screws, tighten (but do not overtighten) the
thumbscrew at each cornerof the powersupply faceplate.
6. Press the switch on thecorresponding circuit breaker to the ON (|)position.
Verifythat on the power supply faceplate the green LED labeled CB ON lights
steadily,the blue LED labeled OUTPUT OK blinks momentarily, then lights
steadily,and the amber LED labeled CB OFF does not l ight.
NOTE: After poweringoff a power supply, wait at least60 seconds before turning
it back on. After powering on a power supply, wait at least 60 seconds before
turning it off.
Replacing Power System Components 199