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8-14 SPARC Enterprise M4000/M5000 Servers Service Manual • August 2009
8.4.1 Accessing the I/O Unit DC-DC Converter
(DDC_A#0 or DDC_B#0)
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.
1. 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 “Powering the
Server Off Using Software” on page 4-12.
Caution – Use proper ESD grounding techniques when handling components. See
“Safety Precautions” on page 1-1.
2. Remove the I/O unit.
This step includes disconnecting and labelling the cables connecting to the PCI
cassettes, removing the cassettes, removing the cable management arm, and
finally removing the I/O unit. See “Removing the I/O Unit” on page 8-10.
8.4.2 Removing the I/O Unit DC-DC Converter
(DDC_A #0 or DDC_B #0)
1. Loosen the two screws at the front of the I/O unit using a No. 2 screwdriver
(
FIGURE 8-9).
2. Push the I/O unit cover slightly forward and then pull the front of the cover up
to remove the cover from the I/O unit.