Cautions To Be Observed When Troubleshooting - Panasonic NN­GS595A Service Manual

10/24/2016
3 CAUTIONS TO BE OBSERVED WHEN
TROUBLESHOOTING
Unlike many other appliances, the microwave oven is a high voltage, high current device. It is free from danger in ordinary use,
though extreme care should be taken during repair.
Caution
Servicemen should remove their watches whenever working close to or replacing the magnetron.
3.1 Check the grounding
Do not operate on a two wire extension cord. The microwave oven is designed to be grounded when used. It is imperative,
therefore, to ensure the appliance is properly grounded before beginning repair work.
3.2 Inverter warnings
DANGER, HIGH VOLTAGE AND HIGH TEMPERATURE (HOT/LIVE) OF THE INVERTER POWER SUPPLY (U)
The High Voltage Inverter Power Supply handles very high voltage and current for the magnetron tube. Though it is free from
danger in ordinary use, extreme care should be taken during repair.
The aluminum heat sink is also energized with high voltage (HOT), do not touch when the AC input terminals are energized. The
power device Collector is directly connected to the aluminum heat sink.
The aluminum heat sink may be HOT due to heat energy, therefore, extreme care should be taken during servicing.
H.V. Inverter warning
WARNING FOR INVERTER POWER SUPPLY (U) GROUNDING
Check the High Voltage Inverter Power Supply circuit grounding. The high voltage inverter power supply circuit board must have a
proper chassis ground. The inverter grounding bracket must be connected to the chassis. If the inverter board is not grounded it will
expose the user to very high voltages and cause extreme DANGER! Be sure that the inverter circuit is properly grounded via the
inverter grounding bracket.
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