70CHAPTER 6: MAINTAINING HARDWARE
6Connect the power cords to separate AC power sources on separate power grids or to a UPS/backup power system.
WARNING: Do not power on the switch until you reconnect all the components.
Replacing a Power Supply
To replace a power supply, you need:
■An antistatic wrist strap
■A screwdriver
WARNING: When installing or replacing the power supply when the power is on, do not touch any naked wire, terminal, or any other part of the product labeled Dangerous Voltage. Always wear the antistatic wrist strap when replacing the supply.
Use the following steps to replace a power supply:
1Loosen the captive screws in the supply that you want to replace.
2Support the power supply you are removing with one hand and gently pull the handle with the other hand until it slides out of the slot.
3If you are not going to install another power supply in this slot, install a blanking plate on the chassis for
4Remove the new power supply from the package and check the input mode.
5Support the power supply in one hand and hold the handle with another hand. Align the supply with the guides in the chassis and slide the supply gently into the slot.
CAUTION: As you are inserting the power supply, if the pin terminal springs up, the pin cannot be seated into the hole and the system will sound an alarm. If the power supply has not been inserted properly, you should slide it out and insert it again to avoid breaking or cracking the power terminals.
6Fasten the captive screws.
CAUTION: If the captive screws cannot be fastened, the power supply may not have been properly seated. Remove and replace the supply.
Over time, the filter on the power supply accumulates dust, which interferes with the heat dissipation of the chassis. It is important to periodically clean the filter as described below:
1Remove the gauze filter by gently pulling it from the front of the power supply.
2Take the filter to a fresh water supply and clean it.
3Leave the filter to dry. Do not use heat to dry the filter as this may cause it to distort.
4When the filter is completely dry, gently push it back into the front of the power module.
CAUTION: Do not clean the filter while it is in position at the front of the power supply. Attempts to do so could result in damage to the equipment or severe electrical shock.
