SOI 05.09 FV
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599 71 58-20
1 -
INTRODUCTION
1.1 -
PURPOSE OF THIS MANUAL
The purpose of this manual is to provide service engineers with technical information concerning the new
magnetic induction hob fitted to free-standing cookers, enabling them to diagnose malfunctions and to repair
the appliances.
1.2 - ESD - ELECTROSTATIC DISCHARGE AND ITS EFFECT ON THE COMPONENTS
The interface for the control unit is not fitted with an internal device to protect against electrostatic discharge.
When effecting repairs, therefore, the service engineer must check for stabilization of the potential on the
oven casing (i.e. discharge any static electricity by touching the oven casing) in order to prevent the
possibility of overload, which might damage the circuit boards.
The same care is necessary when handling circuit boards supplied as spare parts (i.e. not yet fitted to the
appliance), which must be removed from the protective bag in ESD only after stabilizing the potential (i.e.
discharging any static electricity) and only then installed in the appliance.
Important
: The theory behind the process of electrostatic charge and discharge is not discussed in this
Manual, since the tangible effects are considered to be more important. However, the effects are felt
frequently when touching a metal handle and feeling the electrostatic discharge in the form of a minor shock.
But what happens when stabilization of the potential takes place with semi-conductor components (i.e.
components on a circuit board, such as integrated circuits, microprocessors etc.)?
Stabilization of the potential takes place across the internal structure of the semi-conductor component. This
does not necessarily lead to the immediate destruction of the component; subsequent malfunctions across
damaged internal connections may be more harmful, and these occur only as a result of overheating or
current overloads.
It is true that almost all sensitive semi-conductor components (such as MOS circuits) have been improved
by the addition of protective measures, but the internal structures of these components are today smaller
than, for example, ten years ago, which tends to increase their sensitivity to the previous levels.
Important!
Which components are susceptible to damage by static electricity during repairs?
All circuit boards featuring control and command accesses (door switches, food probes etc.), bare tracks
and microprocessors, as well as any other circuits with free access.
Examples:
- Programmers connected to the food probe and the door switch.
- Programmers whose control processors are accessible (due to their high costs, the protective systems
are only partial).
- W.O.E.C. control units.
- S.O.E.C. control units.
- C.H.E.C. control units.
- KRONOS control units.
- Interface boards to electronically-controlled gas hob
- Induction hob board
1.3 - GENERAL DESCRIPTION
With this type of hob, the food is cooked by magnetic induction.
The system comprises a
Tiger Induction
electronic module with two cooking zones designed to suit
saucepans of a given type.
