Sun Microsystems SPARC classic X, Service Manual

Page: 117 / 198

Chapter 10 System Board Overview 10-3
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,” for the part number.
■
Transport the board in an antistatic bag.
Protect yourself and the equipment by observing the safety precautions described in
TABLE 10-1
.
The following items are customer replaceable units.
TABLE 10-1
Safety Precautions
Item Problem Precaution
AC power cord ESD (Electrostatic
discharge) Make sure that the power cord connects the system to a
grounded electrical outlet. The power cord provides a ground
path for the system unit.
Electric shock Make sure that the system power switch is in the standby
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
boards ESD Handle a printed circuit board by the edges only. Store a board
in an antistatic bag.
Cover System damage and
overheating Replace the cover to keep out foreign objects and to prevent
overheating.
Filler panels System damage and
overheating Install filler panels in all unused SBus board slots. Open slots
severely reduce the correct airflow in the system and can lead to
equipment damage.