Panasonic NN-V673SBBPQ Service Manual page 43

Caution
1. Do not try to repair this H.V. Inverter power supply. Replace as a
whole unit. When returning the inverter unit pack in the original
inverter box.
2. Do not adjust the preset volume on the H.V. Inverter. It is very
dangerous to repair or adjust without sufficient test equipment,
this circuit handles very high violate and current.
3. Ensure a good ground connection before beginning any
troubleshooting.
4. Be careful of the high voltage circuit and take necessary
precautions when troubleshooting.
5. Discharge the high voltage capacitors on the inverter.
6. When checking the continuity of the components on the H.V.
inverter circuit, disconnect one lead wire from these parts and
then check the continuity with the AC plug removed. To do
otherwise may result in a false reading or damage to your meter.
When disconnecting a plastic connector from a terminal, you must
hold the plastic connector and not the lead wire, otherwise the
lead wire may become open circuit.
7. Do not touch any parts of the circuitry on the digital programmer
circuit, since static electric discharge may damage this control
panel.
Whilst working on this board ensure that your body is connected
to ground to discharge any static charge.
8. 240 VAC is present on the digital programmer circuit. (Terminals
of the power relays and the primary circuit of the low voltage
transformer). When troubleshooting, be cautious of possible
electric shock.
Before troubleshooting, operate the microwave oven following the correct operating procedures
in the instruction manual in order to find the exact cause of any trouble, since operator error may
be mistaken for the ovens malfunction.
Figure 1
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