HP 750 - Manual (Page 55)

6-3 Removal and Replacement C4705-90000
Safety Precautions
(Safety symbols ' Immediately after the table of contents.)
Review WARNING and CAUTION symbols and instructions before you service the plotters.
Follow these warnings and cautions for your protection and to avoid damaging the plotter.
Serious shock hazard leading to death or injury may result if
you do not take the following precautions:
Ensure that the ac power outlet (mains) has a protective earth
(ground) terminal.
Switch the plotteroff, and disconnect it from the power
source prior to performing any maintenance.
Prevent water or other liquids from running onto electrical
components or circuits, or through openings in the enclosure.
WĂAĂRĂNĂIĂNĂG
Electrostatic Discharge (ESD) Precautions
To prevent damage to the plotter circuits from highĆvoltage electrostatic discharge (ESD)
1 Do not wear clothing that is subject to static buildĆup.
2 Do not handle integrated circuits (ICs) in carpeted areas.
3 Do not remove an IC or a printed circuit assembly (PCA) from its conductive foam pad or
conductive packaging until you are ready to install it.
4 Ground (earth) your body while disassembling and working on the plotter.
5 After removing a cover from the plotter, attach an earthing (ground) 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.
Reassembly
Most of the procedures in this chapter describe how to disassemble the plotter. Unless
otherwise specified, reassemble the parts in the reverse order of disassembly.