Inverter Warning - Panasonic NN-V673SBBPQ Service Manual

1. Inverter warning

The inverter board looks like a normal printed circuit board. However, this printed circuit board
supplies the magnetron tube with very high voltage and current.
The inverter PCB:
1. Produces very high voltage and current.
2. Has an Aluminium heat sink which becomes very hot.
3. Has capacitors in the circuitry that hold a high voltage charge
even when the oven is not operating.
Do not
1. Do not touch the high voltage circuitry. When replacing the board
take extreme care to avoid possible electric shock.
2. Do not touch the aluminium heat sink as it is part of the high
voltage circuit and becomes very hot.
3. Do not attempt to repair the inverter PCB as this can be very
dangerous. Replace the high voltage, inverter circuit as a complete
unit.
4. Do not adjust or tamper with the pre-set volume on the inverter
board. It is very dangerous to adjust this pre-set without proper
test equipment.
5. Do not operate the microwave oven when the inverter grounding
plate and fixing screw is loose. It is very dangerous to operate the
inverter circuit board with out a proper ground connection.
Figure 1
2