Sun Microsystems 220R - Manual (Page 147)

5.3 How to Remove the Power Distribution
Board
5.3.1 Before You Begin
Complete these tasks:
4 Section 2.1 “How to Power Off the System” on page 54
4 Section 6.1 “How to Remove a Power Supply” on page 160
4 Section 2.4 “How to Position the System for Service” on page 60
4 Section 2.6 “How to Remove the System Cover” on page 65
4 Section 2.8 “How to Avoid Electrostatic Discharge” on page 69
4 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.
5.3.2 What 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