Programming instructions

Chapter 4 129
Field Replaceable Units
FRU Removal and Replacement
System Board Tray Assembly
The system board contains the CPU, main memory, I/O section, and all of the circuitry and
connections that control how the workstation’s hardware and operating system interact
with each other. If any of the components on the system board are defective, you must
remove and replace the system board.
Because the system board in the B2000 workstation is mounted on a tray, the following
procedures explain how to remove and replace the system board tray assembly as a
complete unit.
Removing the System Board Tray Assembly
Perform the following steps to remove the system board tray assembly:
1. Open the left side panel of the workstation as shown in the section “Opening the Left
Side Panel.”
2. Remove the following internal components from the workstation:
a. Hard disk drive(s) and bracket(s), as shown in the section “Removing a Hard Disk
Drive” on page 104.
b. PCI retainer clip and all I/O cards, as shown in the section “Removing I/O Cards” on
page 111.
c. All memory DIMM cards, as shown in the section “Removing Memory DIMMs” on
page 114.
d. Power supply, as shown in the section “Removing the Power Supply” on page 119.
e. Both the master and slave voltage regulator modules, as shown in the section
“Removing a Voltage Regulator Module” on page 121.
f. Air divider, as shown in Step 3 of the section “Removing the I/O Fan” on page 125.
3. Disconnect all cables from the system board, including the following:
a. CD drive data and audio cables
b. Floppy disk drive data cable
c. I/O fan and speaker cables
d. System fan cable
e. LCD ribbon cable
4. Fold back all of the cables to avoid interference or damage when removing the system
board tray assembly from the workstation chassis.