Panasonic NN-V673SBBPQ Service Manual page 27

WARNING
There is high voltage present with high current capabilities in the
circuits of the primary and secondary windings, choke coil and heat
sink of the inverter. It is extremely dangerous to work on or near
these circuits with the oven energized. DO NOT measure the voltage
in the high voltage circuit including the filament voltage of the
magnetron.
WARNING
Never touch any circuit wiring with your hand nor with an insulated
tool during operation.
7.3. Part Replacement.
When any part or component is to be replaced, always ensure that the power cord is removed
from the wall outlet.
7.4. When the 10A fuse is blown due to the operation of the short
switch:
WARNING
When the 10A 250V fuse is blown due to the operation of the short
switch, the primary latch switch and short switch must be replaced.
It is also important to change the power relay 1 (RY1) when the
continuity test shows shorted contacts.
1. This is mandatory. Refer to "adjustments and measurements" for
the location of these switches.
2. When replacing the fuse, confirm that it has the appropriate rating
for these models.
3. When replacing faulty switches, be sure the mounting tabs are not
bent, broken or deficient in their ability to hold the switches.
Discharging the high voltage capacitors
17