Panasonic NN-V673SBBPQ, Service Manual

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9.2. 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.
Door Open Door Closed
Monitor switch 0 infinite
9.3. Magnetron
Continuity checks can only indicate an open filament or a shorted magnetron. To diagnose an
open filament or shorted magnetron.
1. Isolate the magnetron from the circuit by disconnecting the HV
leads.
2. A continuity check across the magnetron filament terminals
should indicate one ohm or less.
3. A continuity check between each filament terminal and the
magnetron case should read open.
9.4. Push Button Keyboard
Check the continuity between the switch terminals, by tapping an appropriate pad on the
keyboard. The keypad matrix is shown on
P.29 .
9.5. Inverter Power Supply
Caution
DO NOT try to repair this inverter power supply). Replace as a whole
H.V. Inverter Unit.
Inverter Power Supply Diagram
29