2General Cautions; General Cautions - Canon MultiPASS MP390 Service Manual

Chapter 3

3.1.2 General Cautions

Damage due to electrostatic discharge
This machine contains contact sensors and printed circuit boards that use ROMs, RAMs, custom chips and other
electronic components that are vulnerable to damage by electrostatic discharge.
Be careful to avoid any damage from electrostatic discharge when conducting service that requires disassembly.
Static electricity warning
Electrostatic discharge can destroy electronic components and alter electrical characteristics. Plastic tools and even
your hands, if they are not earthed, contain sufficient static electricity to damage electronic components.
The following materials may be used as countermeasures against electrostatic discharge:
* An earthed, conductive mat,
* An earthed writs-strap,
* Crocodile clips for the purpose of grounding metallic parts of the main unit.
For service conducted on the user's premises, etc., where such countermeasure materials are not available, the
following countermeasures may be employed.
* Use anti-static bags for the storage and carrying of PCBs and electrical elements.
* Avoid silk and polyester clothing and leather-soled shoes, favoring instead cotton clothes and rubber-soled
shoes.
* Avoid working in a carpeted area.
* Before beginning the work, touch the grounded earth terminals of the main unit in order to discharge any static
electricity.
* Use a wrist-strap and earth the metal parts of the main unit.
* PCBs and electrical elements must be lifted around the edges and their terminals must not be touched.
Caution against electrical shock while working with power on
In cases where service must be carried out with power on, via a connected power cable, be sure to wear an anti-static
wrist-strap or other earth, in order to prevent an electrical path being created through your body.
Application of grease
Grease must not be applied to any parts that are not so designated. If grease comes into contact with the rubber cap
3-2
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