Egb - Siemens EH675TK11E Repair Instruction

2.3

EGB

2.3.1 Concept
EGB = "Elektrostatisch Gefährdete Bauelemente" (Electrostatic-
Sensitive Devices)
(Component sensitive to electrostatic shock)
2.3.2 Pictogram
Electronic devices with components that are sensitive to
electrostatic shock (EGB in German) are marked with the
pictogram shown here.
2.3.3 General specifications
The use of cutting-edge electronic technology in current electrical
appliances guarantees high levels of profitability, protection of the
environment, easy handling, operability and safety. Such high-
performance technology can only be handled by qualified technicians
with specialised knowledge.
All electronic modules and constructive units incorporate elements
with a potentially dangerous electrostatic voltage.
2.3.4 Dangerous components
Amongst others, these constructive elements are threatened by
electrostatic voltage:
►
µProcessors
206_58300000141095_ara_en_k.doc – 04.10.a
►
ICs
►
Transistors
►
Tiristors
►
Triacs
►
Diodes
►
etc.
2.3.5 Causes and effect
The human body can generate electrostatic charges in certain
environmental situations. This charge is favoured by dry air and the
coating on insulated floors.
People can transfer an electrostatic voltage:
►
of up to 35,000 volts when standing on a non-conductive
carpet.
►
of up to 12,000 volts when standing on a non-conductive PVC
floor.
►
of up to 1.800 volts when sitting in a padded chair.
The electrostatic voltage in the human body is transferred to electronic
devices and components that are sensitive to electrostatic shock by
touching them, sometimes resulting in damage depending on the
circumstances.
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