5
H4-72-02-03
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.
