Safety Considerations; Esd Considerations - HP C2858A Service Manual

SAFETY CONSIDERATIONS

The Safety Symbols used with Hewlett-Packard instruments are illustrated in the front mat-
ter of this manual. WARNING and CAUTION symbols and instructions must be reviewed
before service work is performed. These warnings and cautions must be followed for your
protection and to avoid damage to the plotter.
The ac power outlet (mains) must have a protective earth
W A R N I N G
(ground) terminal. Serious shock hazard leading to
death or injury may result if the plotter is not properly
grounded.
DO NOT allow water to run onto electrical components
and circuits, or through openings in the enclosure, as this
can create a shock hazard.
Disconnect the plotter from the power source prior to
performing any maintenance.

ESD CONSIDERATIONS

Integrated circuits can be damaged by electrostatic discharge. To prevent damage to the plot-
ter circuits from high voltage electrostatic discharge, take the following precautions:
1. Do not wear clothing that is subject to static build-up.
2. Do not handle integrated circuits (ICs) in carpeted areas.
3. Do not remove an IC or a PCA from its conductive foam pad or conductive packag-
ing until you are ready to install it.
4. Ground your body while disassembling and working on the plotter.
5. After removing a cover from the plotter, attach a clip lead between the PCA common
and earth ground. Touch all tools to earth ground to remove static charges before
using them on the plotter.
6. After removing any PCA from the plotter, place it on a conductive foam pad or into
its conductive packaging to prevent ESD damage to any ICs on the PCA.
Removal and Replacement
6-3