Panasonic NN-CT890SBPQ, Service Manual

Page: 19 / 45

NN-CT890SBPQ
19
WARNING!
DISCHARGE THE HIGH VOLTAGE CAPACITORS
For about 30 seconds after the oven is turned off, an elec-
tric charge remains in the high voltage capacitors in the
inverter power supply circuit board.
When replacing or checking parts, remove the power plug
from the outlet and short the inverter output terminal of the
magnetron filament terminals to the chassis ground with an
insulated handle screwdriver to discharge. Please be sure
to touch the chassis ground side first and then short to the
output terminals.
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.
Inverter Grounding
Figure 2
Discharging the high voltage capacitors
Figure 3