Xerox Phaser 790, Service Manual

Page: 7 / 653

10/00
v Phaser 790/DocuColor 2006
Introduction Initial Issue
Danger label indicates where electrical currents exist when the machine is closed and operat-
ing. Use caution when reaching in the machine.
These symbols indicate components that may be damaged by Electrostatic Discharge (ESD).
Electrostatic Discharge (ESD) Field Service Kit
The purpose of the ESD Protection Program is to preserve the inherent reliability and quality of
electronic components that are handled by the Field Service Personnel. This program is being
implemented now as a direct result of advances in microcircuitry technology, as well as a new
acknowledgment of the magnitude of the ESD problem in the electronics industry today.
This program will reduce Field Service costs that are charged to PWB failures. Ninety percent
of all PWB failures that are ESD related do not occur immediately. Using the ESD Field Service
Kit will eliminate these delayed failures and intermittent problems caused by ESD. This will
improve product reliability and reduce callbacks.
The ESD Field Service Kit should be used whenever Printed Wiring Boards or ESD sensitive
components are being handled. This includes activities like replacing or reseating of circuit
boards or connectors. The kit should also be used in order to prevent additional damage when
circuit boards are returned for repair.
The instructions for using the ESD Field Service Kit can be found in ESD Field Service Kit
Usage in the General Procedures section of the Service Documentation.
Signal Nomenclature
Refer to Figure 2 for an example of Signal Nomenclature.
Figure 2 Signal Nomenclature