Panasonic NN-A890WB Service Manual page 38

13.2. Inverter power supply (U)
1. Discharge the high voltage capacitors
2. Unplug the H.V. Lead wires from the magnetron
3. Remove the connector CN701 and CN702 from the inverter PCB
4. Remove the two screws holding the inverter base to the chassis
(See figure 3)
5. Remove the one screw holding the inverter earth wire to the oven
chassis.
6. Carefully remove the inverter PCB and support base from the
oven.
7. Remove the air guide E by un-clipping the catch hooks
8. Remove the four screws holding the PCB to the inverter support
base.
Caution when replacing the inverter power supply (U)
1. Make sure that grounding plate is in place
2. Securely tighten the grounding screw through the side of the
chassis (Base).
3. Securely connect the 3 lead wire connectors
4. Make sure that the heat sink has enough space (gap) from the
oven. Take care not to touch any lead wire to the aluminium heat
Screws to remove the magnetron
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