Panasonic INVERTER NN-A750WB Manual page 37

Caution
1. High voltage is present at the high voltage terminal of the inverter
unit, including the aluminium heat sink.
2. It is not necessary or advisable to attempt to measure this high
voltage.
3. Before touching any oven components, or wiring, always unplug
the oven from its power source and discharge the high voltage
capacitors.
10.1. Primary Latch Switch, Secondary Latch Switch and power relay
B interlocks.
1. Unplug the lead connectors to power relay B and verify the
continuity of the power relay B 1-2 terminals.
2. Unplug the lead connectors to the primary latch switch and
secondary latch switch.
3. Test the continuity of the switches with the door open and closed
with an ohm meter on the lowest scale.
Normal continuity readings should be as followed.
Primary Latch
Switch
Secondary
Latch switch
Power relay B
10.2. Short Switch and Monitor Circuit
1. Unplug the lead wires from the HV inverter primary terminals.
2. Connect the test probes of the ohm meter to these leads
3. Test the continuity of the short switch with the door open and the
door closed using the lowest ohm scale.
Monitor switch
10.3. Magnetron
Door Open Door Closed
infinite 0
(Open)
infinite 0
(Open)
infinite infinite
(Open) (Close)
Door Open Door Closed
0 infinte
(Close)
(Close)
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