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8-24 SPARC Enterprise M4000/M5000 Servers Service Manual • August 2009
8.4.7 Replacing the I/O Unit DC-DC Converter Riser
Caution – The DC-DC converter (DDC_B#0) that goes in the slot on the DC-DC
Converter Riser has a metal heat sink. The DC-DC converter (DDC_A#0) that goes in
the slot on the I/O board does not. If these converters are installed in the wrong
slots, serious damage to the I/O unit will result.
1. Replace the DC-DC converter (DDC_B#0) onto the DC-DC converter riser. See
Section 8.4.3, “Installing the I/O Unit DC-DC Converter (DDC_A #0 or DDC_B
#0)” on page 8-17.
2. Push gently downward to seat the DC-DC converter riser in the socket in the
I/O unit.
3. Rethread the small cable back through the hole in the bracket
4. Place the metal bracket into position and tighten the three screws that hold the
metal bracket in place.
Reconnect the small cable before tightening the screws to the bracket.
5. Install the I/O unit cover.
6. Tighten the two screws at the front of the I/O unit using a No. 2 screwdriver.
8.4.8 Securing the Server
1. Install the I/O unit.
This step includes installing the I/O unit, restoring the cable management arm,
installing the cassettes and connecting the cables to the correct cards. See
“Installing the I/O Unit” on page 8-11.
2. Power on the server.
This step includes reconnecting power cables, verifying the state of the LEDs,
and turning the keyswitch to the Locked position. See “Powering the Server On
Using Software” on page 4-13.