User`s guide

2-8
Installing and Connecting to the Network
2. Observe the power-up sequence again.
3. If the power-up sequence is still abnormal, contact Cabletron
Systems Technical Support, See Chapter 1, Getting Help.
Replacing the Power Supply
It is critical that the power supply inserted into the top slot of the
ATX chassis be installed very carefully if you are installing it while
the ATX is powered on. Failure to use caution while installing the
power supply could cause it to come in contact with the bottom of
the Packet Processing Engine (PPE) board, causing the PPE to short
circuit.
The power supply must slide straight into the chassis underneath
the tabs shown in black in Figure 2-4 and rest on its metal support
bracket, also shown in Figure 2-4.
Caution: If you attempt to slide the power supply into the chassis at an
angle, or if you position the power supply above the tabs shown
in Figure 2-4, you risk short circuiting the PPE board.