40 SPARCstation 20 Service Manual • July 1996
Symbols
The following symbols are used throughout this manual:
TABLE 5-1 Safety Precautions
Item Problem Precaution
AC power cord Electric shock Unplug the AC cord from the AC wall socket before
working on the power supply.
Grounding Leave the AC power cord plugged into the AC wall
outlet when replacing drives, SIMMs, chips, or the
system board. Leaving the AC power cord plugged into
the wall outlet provides a grounding path for the wrist
strap, which you must wear while servicing the system.
Power-On/ Standby switch Remove DC power from the system by pressing the
Standby switch before unplugging a working unit or
connecting a replacement unit.
NOTE—If not set to standby before being unplugged,
the power supply will turn on automatically when it is
plugged in again, even if the power-on/standby switch
or keyboard buttons are not touched.
Wrist strap ESD Wear a grounded wrist strap when handling printed
circuit boards, drives, or other components such as
SIMMs.
ESD mat ESD An approved antistatic mat, when used with a wrist
strap, provides protection from static damage. The mat
also cushions and protects small parts that are attached
to printed circuit boards. Chapter 12 lists the part
number of the mat.
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 after performing service on the
system.
SBus and MBus
slot filler panels
System damage and
overheating
Install filler panels in all unused SBus and MBus slots.
Openings on the back panel reduce the cooling
capability of the system.
Heat sinks on
MBus module, and
system board
Heat, burns Do not touch the metal heat sinks on the MBus module
or the system board. The heat sinks can be hot enough to
cause personal injury.
To Next Page
Loading...
Need help?
General
