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GENERAL
5.9
HANDLING CIRCUIT BOARDS
Circuit boards with control electronics are sensitive to
discharges of static electricity (ESD – ElectroStatic
Discharge) when handled. To prevent damaging the
components, special care is therefore required when
handled.
CAUTION: Wearing a ground-connected
bracelet is highly recommended.
Fig. 5
Bracelet
Damage is usually hidden due to the nature of the failure,
and a circuit board can operate impeccably during
commissioning but show signs of problems later.
Charged objects may only be problematic if they are in
close proximity to the electronics. Keep a distance of at
least one metre from expanded polystyrene, protective
plastic and other packaging, synthetic material (e.g.
fleeces) and similar before starting work.
Anti-static protection facilities (e.g. mats, wrist bands
etc) should always be used if available. If not available,
the following handling precautions must be observed ;
touch the boiler earth immediately prior to removing the
part from the packaging. Handle the PCB only at the
edges. Touch earth on a regular basis whilst the board is
being fitted and connected. Do not touch any electronic
components.
10
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A condition for good ESD protection is a ground-
connected bracelet when handling electronics. This
bracelet should be put on before opening the screened
metal bag/packaging or before exposing an installed
board. The bracelet should be worn until the circuit
board is enclosed in its screen packaging or closed
electric box. Replaced, returned circuit boards should
be handled in the same way.
6 720 614 366-24.1I
Fig. 6
6 720 614 366-25.1I
6 720 641 467 (2010/01)
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