General Cautions - Canon MultiPASS C755 Service Manual

MultiPASS C755 Chapter 2: Assembly and Disassembly

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.
The following materials may be used as countermeasures against electrostatic discharge:
• an earthed, conductive mat,
• an earthed wrist-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, favouring 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 lifted around the edges and their terminals must not be touched.
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 of the purge unit or wire, the BJ cartridge nozzle may become blocked and the cartridge
rendered unusable. Also, never use any other than the specified type of grease. Otherwise, plastic parts
and rubber parts may melt or be otherwise deformed.
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.
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.
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.
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