Panasonic INVERTER NN-A750WB Manual page 38

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.
10.4. Push Button Keyboard
Check the continuity between the switch terminals, by tapping an appropriate pad on the
keyboard. The keypad matrix is shown on
10.5. Inverter Power Supply
Caution
DO NOT try to repair this inverter power supply). Replace as a
whole H.V. Inverter Unit.
Key Board
Inverter Power Supply Diagram
38
Matrix.