10 System Board Overview

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Damage Prevention                      page 10-1
                                       
Handling System Boards and Assemblies  page 10-1
                                       
System Board Description               page 10-3
                                       
Replaceable System Board Components    page 10-4

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10.1 Damage Prevention

Caution -

Use an antistatic mat (part numbers listed in Chapter 12, "Illustrated Parts Breakdown") when working with the system board. An antistatic mat contains the amount of cushioning needed to protect the underside components, to prevent board flexing, and to provide antistatic protection.

10.2 Handling System Boards and Assemblies

Caution -

The system chassis power must be turned off, and the AC power cord must remain plugged in to ensure a proper ground.

Caution -

Hot surface. Avoid contact. Surfaces are hot and may cause personal injury if touched.

Caution -

The system board and related modules and cards have surface- mount components which may break when the board is flexed.

To minimize the amount of board flexing, observe the following precautions:

Hold the system board only by the edges.

Do not place the system board on a hard surface. Use a cushioned antistatic mat. See Chapter 12, "Illustrated Parts Breakdown."

Transport the board in an antistatic bag.

Protect yourself and the equipment by observing the safety precautions described in Table 10-1.

Table 10-1 Safety Precautions

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Item              Problem              Precaution
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AC power cord ESD (Electrostatic Make sure that the power cord connects the system to a grounded electrical
discharge) outlet. The power cord provides a ground path for the cabinet.

Electric shock Make sure that the system power switch is in the OFF position before
opening the system for service.

Wrist strap ESD Wear a wrist strap when handling printed circuit boards.

ESD mat ESD Use the antistatic mat (see Chapter 12, "Illustrated Parts Breakdown") when
working on a printed circuit board. In addition to providing ESD protection,
the mat also cushions the board to prevent breakage of parts mounted on the
bottom of the board.

Printed circuit ESD Handle a printed circuit board by the edges only. Store a board in an
boards antistatic bag.

Cover System damage Replace the cover to keep out foreign objects and to prevent overheating.
and overheating

Filler panels System damage Install filler panels in all unused SBus card or MBus module slots. Open
and overheating slots severely reduce the cooling capability of the system and can lead to
equipment damage.

MBus module, Heat, burns Do not touch the metal heat sinks on the MBus module or the SPAM chip.
SMC chip The heat sinks may be hot enough to cause personal injury.

heat sinks

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