8-10 SPARC Enterprise M4000/M5000 Servers Service Manual • December 2010
8.3 I/O Unit Replacement
The I/O units are cold replacement components.
8.3.1 Accessing the I/O Unit
Caution – There is an electrical hazard if the power cords are not disconnected. All
power cords must be disconnected to completely remove power from the server.
● Power off the server.
This step includes turning the key switch to the Service position, confirming that the
POWER LED is off, and disconnecting power cables. See Section 4.4.1, “Powering the
Server Off Using Software” on page 4-12.
8.3.2 Removing the I/O Unit
Caution – Use proper ESD grounding techniques when handling components. See
Section 1.1, “Safety Precautions” on page 1-1.
1. Disconnect and label all the cables that connect to the I/O unit.
2. Remove the cassettes from the I/O unit.
See Section 8.1.2, “Removing the PCI Cassette” on page 8-5.
3. Disconnect the cabinet end of the cable management arm.
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