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1. Attach an Electrostatic Discharge (ESD) wrist strap to the ESD grounding point on the back of the chassis, and place the other end around your wrist (see Connecting Electrostatic Discharge Wrist Strap for details).
2. Disconnect -48VDC power to the DC Power Supply being replaced by shutting off circuit breaker or removing fuse on facilities power distribution panel or similar operation.
3. Verify the POK LED is off on the DC Power Supply being replaced.
4. Ensure that power is no longer present on power cables using a voltmeter.

5. Remove clear plastic protective cover on terminal strip.

   Caption
   0 Figure 1 Removing the plastic protective cover

6. Disconnect RTN and -48V connections by loosening two terminal strip screws using the #2 Philips screwdriver.

   Caption
   0 Figure 1 Disconnecting the RTN and -48V connections

7. Disconnect Chassis Power Supply Ground connection by removing the screw securing the green chassis ground Ground wire to the DC Power Supply using the #2 Philips screwdriver.
8. Disengage the DC Power Supply latch by moving the latch to the left.
9. Pull on the loop handle to slide the DC Power Supply out of the SBC chassis.
10. Install the replacement DC Power Supply into the

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    chassis by sliding it forward until the latch clicks in place.
11. Reconnect the green chassis ground green Power Supply Ground wire to the DC Power Supply using the torque driver supply and tighten the screw to 13.9 in/lb.
12. Reconnect the RTN and -48V cables to the terminal strip screws and tighten to 13.9 in/lb using the torque driver.
13. Reinstall the clear plastic protective cover on the terminal strip.
14. Apply power to the DC Power Supply by turning the circuit breaker or installing the fuse on facilities power distribution panel or similar operation.
15. Verify that the POK green LED on the newly-replaced Power Supply is solid green.
16. From the application, verify that no Power Supply alarms are generated. 

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