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5 Service Manual
For internal use only
1.1 Microwave warnings
The microwave oven generates high voltages which may lead to serious or even fatal injury -
it is essential to observe the safety regulations contained in this repair manual at all times.
Always disconnect the microwave from the mains prior to removing or installing components. Never
attempt to measure voltage on the inverter, the magnetron or high-voltage conducting wire. This
high-voltage circuit generates voltages exceeding 4000 volts.
Always connect the microwave oven to a residual current overload circuit breaker prior to measuring
electric currents.
Check to ensure that the power required by the oven does not exceed the nominal power of the
mains power supply.
Pull the plug out of the mains socket and discharge the high-voltage capacitors of the converter
switch prior to removing or installing components.
Connect the microwave oven with a twin-wire extension cable. The microwave oven must be
earthed. Looking for faults on a microwave oven that is not earthed is extremely dangerous.
Carry out a functional test when repair work has been completed.
Carry out a microwave leakage current test when repair work has been completed.
1.2 Electric connection
Only connect the appliance to sockets with a safety fuse of at least 16 A. Please also check to
ensure that the main fuse in your home has a minimum output of at least 16 A so that it will not sud-
denly trip when the microwave oven is in operation.
Before operation, check whether the mains voltage is the same as that indicated on the name/rating
plate of the appliance and whether the socket outlet is effectively earthed. The manufacturer
assumes no liability for damage which occurs through the non-observance of these regula-
tions.
1.3 Converter switch warnings
The converter switch generates current of more than 4000 volts! Never attempt to measure the volt-
age in this switch.
The aluminium dissipater on the converter switch gets very hot! Allow the dissipator to cool down
prior to removing the converter switch.
Pull the plug out of the mains socket and discharge the high-power capacitors of the conversion
switch before removing the converter switch.
The converter switch must be earthed. After replacing the converter switch tighten the earth terminal
and the earthed leads to the microwave oven casing. A converter switch with no earth connection
may be dangerous.
5


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