Canon JX500 Service Manual page 26

3-2-6 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:
Earth-connected conductive mat
Crocodile clips for the purpose of grounding metallic parts of the main unit
Earth-connected wrist-strap
(Use 1MΩ resistance-integrated current control type.)
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 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.
(Use 1MΩ resistance-integrated current control type.)
PCBs and electrical elements must be lifted by holding the edges and avoid direct contact
with terminals.
Electric shock during the service
Wear an earth-connected equipment [e.g., wrist-strap (1MΩ resistance-integrated
current control type)] if the machine is in current carrying condition during the
service.
3-2-7 Attaching and removing cables
Attaching and removing cables with the power still on may cause breakdowns and should be
avoided.
In particular, flat cables are likely to cause short circuits. When attaching or removing cables,
always be sure to turn the power off.