Case 2: If either of the two power supplies partially fails, the "Power Indicator" LED on the front
panel is green and no alarm sounds. On the back of the unit, the "Power Supply Status" LED for
the unit that has partially failed is yellow. This is the power supply to replace.
Static-Sensitive Devices
CAUTION:
Electrostatic discharge (ESD) can damage electronic components.To prevent damage to any
printed circuit boards, it is important to handle them very carefully. The following measures are
generally sufficient to protect your equipment from ESD damage.
■
Be sure that the appliance chassis is properly grounded through the AC power cord or enclosure
frame.
■
Touch a grounded metal object before removing the power supply from the anti-static bag.
■
Put on the grounding wrist strap, handle the power supply by its edges only, and do not touch
components on the bottom.
Single Power Supply Replacement
1. Ensure that the power cord is unplugged from the failed power supply module. Then, while
holding onto the handle, press the red locking tab on the bottom right of the power supply in
toward the handle.This will disengage the power supply.
2. Pull the power supply module straight out. Check to make sure that the replacement power
supply module is the same type as the one previously removed.
3. Carefully push the replacement power supply module straight into the appliance until you hear
the release tab click into place.
Sophos Web Appliance | Getting Started | 21
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