Panasonic NN-A890WB Service Manual page 49

14.4. Push Button Keyboard
Check the continuity between the switch terminals, by tapping an appropriate pad on the
keyboard. The keypad matrix is shown on
14.5. Inverter Power Supply
Caution
DO NOT try to repair this inverter power supply). Replace as a
whole H.V. Inverter Unit.
14.6. Inverter Power Supply Unit
Warning
Do not attempt to make any measurements in the high voltage
circuitry of the inverter or magnetron.
Key Board Matrix.
Figure 3
Inveter power supply diagram
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