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Panasonic NN-T221MB Service Manual

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Order Number MOP0107026C2

Microwave Oven

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Summary of Contents for Panasonic NN-T221MB

  • Page 1: Microwave Oven

    Order Number MOP0107026C2 Microwave Oven...
  • Page 2 © 2001 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribu- tion is a violation of law.

  • Page 3: Inverter Warning

    It is very dan- Inverter Layout gerous to operate the inverter circuit board with out a proper ground connection. Figure 2 2 FEATURE CHART FEATURES NN-T221MB Microwave Weight Defrost Weight Reheat Weight Cook Stage Cooking 3 Stage Delay Stand Kg >...

  • Page 4: Control Panel

    3 Control Panel...
  • Page 5 4 Operation and Digital Programmer Test Procedure Operation guide on the display. 4.4. Autoweight Defrost To assist in programming, the next operation will appear on the display. When you are used to operating the oven, you can turn the operating guide off. 4.1.
  • Page 6 4.8. To Set Child Safety Lock 4.9. Demonstration Mode...

  • Page 7: Schematic Diagram

    5 Schematic Diagram...

  • Page 8: Description Of Operating Sequence

    6 Description of Operating Sequence 6.1. Variable power cooking control HIGH VOLTAGE INVERTER POWER SUPPLY (U) controls output power bya signalfrom the Digital Programmer Circuit (DPC). Power relay 1 stays on to supply power to the inverter circuit. The output power is controlled by the drive signal level from the inverter circuit.

  • Page 9: Cautions To Be Observed When Troubleshooting

    7 Cautions to be Observed When Troubleshooting Unlike many other appliances, the microwave oven is a high voltage, high current device. Though it is free from danger in ordinary use, extreme care should be taken during repair. Caution Servicemen should remove their watches whenever work- ing close to or replacing the magnetron.

  • Page 10: Part Replacement

    7.3. Part Replacement. 7.7. Sharp Edges When any part or component is to be replaced, always ensure Caution Use extreme caution when unpacking, installing or moving that the power cord is removed from the wall outlet. the unit, as some exposed edges may be sharp to touch 7.4.

  • Page 11: Disassembly And Parts Replacement Procedure

    8 Disassembly and Parts Replacement Procedure 8.1. Magnetron Caution when replacing the inverter power supply (U) 1. Make sure that grounding plate is in place. 1. Discharge the high voltage capacitors on the inverter cir- 2. Securely tighten the grounding screw through the side of cuit.

  • Page 12: Digital Programmer Circuit (Dpc) And Membrane Key Board

    8.3. Digital Programmer Circuit 8.4. Low voltage transformer and/ (DPC) membrane or power relays (RY1) board. Note Be sure to ground your body to discharge any static NOTE: Ground any static electric built up on your body before before handling the DPC. handling the DPC.

  • Page 13: Door Disassembly

    Figure 6 8.6. Temp Sensor (Thermal Protec- tor) 1. Replace the temperature sensor by replacing the lead- wire harness B as a complete item. 2. Disconnect screw holding temperature sensor to the chassis 3. Disconnect connector CN4 from DPC DU. 4.

  • Page 14: Turntable Motor

    8.8. Turntable Motor 1. Remove the motor cover by breaking off at the 8 spots indicated by the arrows. 2. Disconnect the two lead wires connected to the turntable motor. 3. Remove the turntable motor by removing the two screws. Note: After breaking off the motor cover, make sure that cut-off portions are properly trimmed off or bent inside so that no sharp edges are exposed.

  • Page 15: Component Test Procedure

    9 Component Test Procedure 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.

  • Page 16: Inverter Power Supply

    9.5. Inverter Power Supply Caution DO NOT try to REPAIR this H.V. inverter power supply). Replace as a whole H.V. Inverter Unit. Figure 3 Inverter Power Supply Diagram 9.6. Inverter Power Supply Unit Warning Do not attempt to make any measurements in the high volt- age circuitry of the inverter or magnetron.

  • Page 17: Measurements And Adjustments

    10 Measurements and Adjustments Warning • For continued protection against radiation hazard, replace only with identical parts. • When the 10 amp fuse is blown due to the operation of the short switch, you must replace the primary latch switch and short switch.

  • Page 18: Troubleshooting Guide

    11 TroubleShooting Guide...

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