Esd-Related Note: Electrostatic Discharge (Esd) - Bernina 330 Service And Maintenance Manual

1.4 ESD-related note: Electrostatic Discharge (ESD)

Electrostatic charges are caused by:
If this static electricity discharges through electronic components, these may
be partially or irreparably damaged. Electrostatically charged persons
represent the greatest danger for components. This can be dissipated by
controlled electrostatic discharge.
Protection of electrical and electronic components against electrostatic discharges
Please note the following points:
1. Always work at a stationary, ESD-compliant workstation equipped with the appropriate ESD protective
devices including conductive table and/or floor mat, earth connection box and earthing wristband when doing
service work.
The cable of the earthing wristband must have a built-in resistance of 1 M ohm to ensure protection.
2. Always put on an earthing wristband before starting to work. Always remove any synthetic parts like plastic
bags, covers etc. from your workstation.
3. Only open ESD protective packaging at your ESD-proof workstation while wearing an earthing wristband.
Electronic components must only be placed on conductive table mats.
Packing is carried out under the same conditions.
4. Only use conductive ESD-capable plastic/foil pouches and ESD transport boxes for dispatching electronic
components – even if the components might be faulty.
5. To prevent consequential damage or harm, treat faulty PCBs in the same manner as new ones.
BERNINA International AG · Seestrasse 161 · CH-8266 Steckborn · Switzerland
a person's walking (influence)
friction between and
(triboelectricity)
separation of two insulating materials
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