9
H4-72-02-03
For internal use only
5.
Repairs
5.1
Safety precautions - microwave energy
Service technicians must never be exposed to the microwave radiation which can be
emitted by the magnetron or other components producing microwaves if the appliance
is not connected correctly or operated improperly.
All input and output connections, waveguides, flanges and seals are to be attached and
sealed correctly.
Never operate the appliance without having placed items in the cooking cavity which ab-
sorb the microwaves.
Never look into the open waveguide or the antenna when the. magnetron is live.
The appliance must never be operated without the housing or with the door open.
If the fuse blows, always block the system operability first (all microswitches) before the
appliance is switched on again. If a microswitch is defective, always replace all mi-
croswitches.
Before activation of the magnetron or before repair work, check the following points with all
appliances:
• The door does not close properly at the frame because it is deformed or the hinges are damaged.
• Door or door seal damaged
• Appliance obviously damaged
All defective or incorrectly set components in the locking, control, door locking, microwave generator and
transmission systems must be repaired, replaced or correctly set. Service technicians must first remove
their watches for all work on or near the magnetron.
•
Attention!
The high-voltage capacitor could still be electrically charged about 30 sec. after the appliance has
been switched off. It is advisable to discharge the capacitor each time through both poles using a
suitably insulated cable. Secondary power circuits of the transformer have a high voltage and a low
amperage and for this reason it is extremely dangerous to work near these components if the appli-
ance is plugged into the mains. Never touch cables with your bare hands or with non-insulated tools
when the appliance is in operation.
• Do not measure the electric voltage of a high-voltage circuit or magnetron filament.
• Make sure that the door is not loose or is missing. If the screws are not tightened fully, this could lead
to the discharge of microwaves.
• Before you switch on the appliance, check that all electric connections are tight.
• Ensure with a reasonable procedure that no microwaves are emitted.
• Do not insert any metal objects either through the lamp gap or through any other gap as such objects
could act as an antenna and could result in the emission of microwaves.
