Sun Microsystems SPARCclassic Service Manual page 115

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:
4 Hold the system board only by the edges.
4 Do not place the system board on a hard surface. Use a cushioned antistatic mat.
See Chapter 12, for the part number.
4 Transport the board in an antistatic bag.
Protect yourself and the equipment by observing the safety precautions described in
Table 10–1.
Safety Precautions
TABLE 10–1
Item Problem
AC power cord ESD
(Electrostatic
discharge)
Electric shock
Wrist strap ESD
ESD mat ESD
Printed circuit ESD
boards
Cover System damage
and overheating
Filler panels System damage
and overheating
The following items are customer replaceable units.
Precaution
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.
Make sure that the system power switch is in the
standby position before opening the system for service.
Wear a wrist strap when handling printed circuit
boards.
Use the antistatic mat (see Chapter 12) 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.
Handle a printed circuit board by the edges only.
Store a board in an antistatic bag.
Replace the cover to keep out foreign objects and to
prevent 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.
101
System Board Overview