Sun Microsystems 220R service manual How to Remove the Power Distribution Board, Before You Begin

5.3How to Remove the Power Distribution Board

5.3.1Before You Begin

Complete these tasks:

Section 2.1 “How to Power Off the System” on page 54

Section 6.1 “How to Remove a Power Supply” on page 160

Section 2.4 “How to Position the System for Service” on page 60

Section 2.6 “How to Remove the System Cover” on page 65

4Section 2.8 “How to Avoid Electrostatic Discharge” on page 69 Section 6.3 “How to Remove the Fan Tray Assembly” on page 164

Caution - Unplug the AC power cord(s) from the back of the system before performing this procedure. Attempting to remove the power distribution board while the AC power cord is plugged into a power source can result in serious personal injury.

Note - You need to remove the system power supplies before attempting to remove the power distribution board.

5.3.2What to Do

1.Disconnect the CPU core voltage power cable and the CPU core voltage power sense cable from the power distribution board at connectors J0202 and J0203.

For information about cable connector locations, see Section 5.5 “How to Connect the System Cables” on page 155.

2.Disconnect the UltraSCSI data cable from the main logic board at connector J1801.

3.Disconnect the I/O power cable from the power distribution board at connector J0210.

4.Disconnect the main power cable from the power distribution board at connectors J0201 and J0207.

Removing and Replacing Backplanes and Cables 147