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14-4 SPARC Enterprise M4000/M5000 Servers Service Manual • August 2009
14.1.1 Accessing the SPARC Enterprise M4000 Backplane
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.
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.
Removing the I/O unit includes multiple steps such as removing labelling and
disconnecting the cables, removing the PCI cassettes, and disconnecting the cable
management arm. See “Removing the I/O Unit” on page 8-10.
3. Remove the XSCF unit.
See “Removing the XSCF Unit” on page 9-4.
Caution – To prevent the equipment rack from tipping over, you must deploy the
antitilt feature, if applicable, before you slide the server out of the equipment rack.
Note – When drawing out the SPARC Enterprise M4000/M5000 Server to the front,
release the cable tie holding the PCI cables on the rear of the server.
4. Remove the top cover.
This step includes deploying the rack’s antitilt features (if applicable), sliding the
server out of the equipment rack, and removing the top cover. See “Removing the
Top Cover” on page 5-5.
Caution – The motherboard unit is a long and heavy assembly that houses the
system motherboard on the underside. Two people are recommended to lift the unit.