Panasonic NN-SD452W, NN-ST452W, NN-ST462M

9 DIGITAL PROGRAMMER CIRCUIT

9.1. SCHEMATIC DIAGRAM (NN-SD452W)

NN-SD452W/ NN-ST462M / NN-ST452W

Contents

Main Page Page CONTENTS Page Page Page 2.1. Variable power cooking control 2.2. Inverter power supply circuit 2.3. Turbo defrost, Auto cook 2.4. Sensor cooking 2 DESCRIPTION OF OPERATING SEQUENCE 2.5. Steam sensor and digital programmer circuit 3.1. Check the grounding 3.2. Inverter warnings 3 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING 3.3. Part replacement. 3.4. When the 10A fuse is blown due to the malfunction of the short switch: 3.5. Avoid inserting nails, wire etc. through any holes in the unit during operation. 3.6. Verification after repair 3.7. Sharp edges 4 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 4.3. Low voltage transformer and/or power relays (RY1, RY2) 4.4. Fan motor 4.5. Door assembly Page 4.6. Turntable motor 4.7. Steam sensor 4.8. Inverter power supply 5.1. Primary, Secondary Latch Switch interlocks & Power Relay RY1 5.2. Short Switch 5.3. Magnetron 5.4. key board membrane (Membrane switch assembly) 5 COMPONENT TEST PROCEDURE 5.5. Inverter power supply (U) 5.6. Temperature thermistor 6.1. Adjustment of primary latch switch, secondary latch switch and short switch. 6.2. Measurement of microwave output 6 MEASUREMENTS AND ADJUSTMENTS 7 TROUBLESHOOTING GUIDE DANGER: HIGH VOLTAGES 7.1. (Troubleshooting) Oven stops operation during cooking 7.2. (Troubleshooting) Other problems 7.3. Troubleshooting of inverter circuit (U) and magnetron 7.4. Simple way of H.V. Inverter/magnetron troubleshooting 7.5. How to check the semiconductors using an OHM meter 7.6. H.V. INVERTER MAIN PARTS LIST (Z606YBA00QP) Page 8.2. PARTS LIST 8.3. ESCUTCHEON BASE ASSEMBLY 8.3.1. NN-SD452W 8.3.2. NN-ST462M, ST452W 8.4. DOOR ASSEMBLY Page 8.6. PACKING AND ACCESSORIES