To remove a power supply:
1. Make sure that the voltage across the DC power source cable leads is 0 V and
that there is no chance that the cables might become active during the removal
process.
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.
2. For a nonredundant power supply, power off the system. See Powering Off the
T640 Router. For redundant power supplies, check that the other power supply
is functional.
3. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and
connect the strap to one of the ESD points on the chassis. For more information
about ESD, see Preventing Electrostatic Discharge Damage to an M Series, MX
Series, or T Series Routing Platform.
4.
Switch the circuit breakers on the power supply faceplate to the off position (O).
NOTE: After powering off a power supply, you must wait at least 60 seconds before
turning it back on.
5. Remove the clear plastic cover protecting the terminal studs on the faceplate.
6. Using a 7/16-in. (11 mm) nut driver, remove the nuts and washers from the
terminal studs (see Figure 1).
2 ■ Removing a T640 Two-Input 160-A Power Supply
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