Panasonic NN-A720MB, Manual

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6. When checking the continuity of the switches on the H.V. inverter,
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
cicruit, since static electric discharge may damage this control
panel.
Whilst working on this board ensure that 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
Troubleshooting (No Operation)
Figure 2
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