Chevrolet TrailBlazer, Руководство по обслуживанию, Страница: 202 / 677

CAUTION
Many electronic components are considered to be "static sensitive". This means that their
electronic components are vulnerable to damage from the natural static electricity that
builds up on people and other objects if not properly discharged.
In the event of static damage, components might fail immediately or might continue to
operate, but suffer unexpected failure later. To eliminate the problem you and the work
place where you handle static sensitive components must be designed to discharge any
static electricity that might build up and do so in a safe manner. "Safe" means safe to you
and the component/device being handled. Static electricity arises when non-conducting
materials move (rub) over each other. Electronic components can be damaged at very low
voltages, starting from as low as five volts. Static electricity is generated every time you
move, but the principal causes are walking on a man made surface (nylon carpet),
movement in your chair (clothes against the fabric of the seat) and movement between
your clothes and yourself. As a rule man made materials (nylon, polyester) are more
vulnerable than natural materials such as leather and cotton. Voltages of hundreds to low
thousands are common. The "snap" of a static discharge that you can hear on a dry day
occurs at voltages far in excess of those at which damage might occur in electronic
devices. Thus you will not be aware if you are carrying dangerous levels of static, you
must assume that you are. To protect an electronic device, you, your tools, your work
bench and the electronic device must be at the same potential. Practically speaking that
potential value is ground.
In order to discharge any static electricity that might build up, you need to discharge it to
ground. For the most technicians, the best way to achieve this is by wearing an
appropriate wrist strap. The wrist strap will have a wire to ground to discharge any body
potential. The ground wire MUST contain a series resistor of at least 1 million ohms, (10M
is a good value) this will avoid an accidental induction of current into the wrist band if the
ground lead comes in contact with live current.
Cleanliness and Care, Shop Practice
It should be understood that proper cleaning and protection of machined surfaces
and friction areas is part of the repair procedure. This is considered standard shop
practice even if not specifically stated.
When any internal engine parts are serviced, care and cleanliness is important.
When components are removed for service, they should be marked, organized or
retained in a specific order for reassembly.
At the time of installation, components should be installed in the same location and
with the same mating surface as when removed.
An automobile engine is a combination of many machined, honed, polished and
lapped surfaces with tolerances that are measured in millimeters or thousandths of
an inch. These surfaces should be covered or protected to avoid component
damage.
A liberal coating of clean engine oil should be applied to friction areas during
assembly.
Proper lubrication will protect and lubricate friction surfaces during initial operation.