CAUTION: You must ensure that power connections maintain the proper polarity.
The power source cables might be labeled (+) and (–) to indicate their polarity. There
is no standard color coding for DC power cables. The color coding used by the external
DC power source at your site determines the color coding for the leads on the power
cables that attach to the terminal studs on each power supply.
5. Remove the power cable from the DC power source.
6. Use a Phillips screwdriver to remove the clear plastic cover protecting the terminal
block.
7. Within the terminal block, remove the screw that fastens the power cable lug to
the terminal block.
8. Carefully move the power cable out of the way.
9. Using the removed screw, secure the replacement power cable (see 1) to the
appropriate terminal. Tighten the screw until snug. Do not overtighten.
The screw contains a captive washer used to secure the power cable lug to the
terminal block.
NOTE: Each power supply must be connected to a dedicated DC power feed. For
information about connecting to DC power sources, see “Connecting
Power” on page 84.
10. Dress the power cable appropriately.
11. Replace the clear plastic cover over the terminal block.
12. Verify that the power cable does not block access to router components or drape
where people might trip on it.
13. Press and release the power button to power on the router. Verify that the POWER
LED lights steadily.
Removing a DC Power Supply
The power supplies are located at the right rear of the chassis. A power supply weighs
2.4 lb (1.1 kg).
To remove a DC power supply (see Figure 79 on page 144):
1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and
connect the strap to the ESD point on the chassis, or to an outside ESD point if
the router is disconnected from earth ground. For more information about ESD,
see “Preventing Electrostatic Discharge Damage” on page 201.
2. Press and release the power button to power off the Services Router. Wait for
the POWER LED to turn off.
3. Ensure that the voltage across the DC power source cable leads is 0 V and that
the cable leads cannot become active during installation.
Replacing Power System Components ■143
Chapter 8: Replacing Hardware Components