Specifications

Replacing Power Components (SSG 550 Only)  49
Servicing the Device
Removing a Power Supply Unit
To remove an AC power-supply unit (PSU) from a device:
1. Attach an ESD grounding strap to your bare wrist, and connect the strap to the
ESD point on the device.
2. Unplug the power cord from the power-source receptacle.
3. Unplug the power cord from the appliance inlet on the power-supply faceplate.
4. With your thumb, slide the metal ejector tab on the power-supply faceplate to
the right, and hold it in place to unlock the PSU.
Figure 17: Sliding AC/DC Power Supply Ejector Tab
5. Grasp the handle on the power-supply faceplate, and pull firmly to start
removing the power supply. Slide it halfway out of the chassis as shown in
Figure 17.
6. Place one hand underneath the power supply to support it, then slide it
completely out of the chassis.
To remove a DC PSU:
1. Attach an ESD grounding strap to your bare wrist, and connect the strap to the
ESD point on the device.
CAUTION: Do not leave a power supply slot empty while the device is operational.
The power supply or a blank power-supply faceplate must remain in the chassis
for proper airflow.
Metal
ejector tab
NOTE: If you are not reinstalling a power supply into the emptied slot, install a blank
power-supply faceplate over the slot.
WARNING: Before removing a DC PSU, you must shut off current to the DC feed
wires that lead to the PSU.