Panasonic NN-SD452W - Manuals

Page 4 - CONTENTS

1 SCHEMATIC DIAGRAM 5 2 DESCRIPTION OF OPERATING SEQUENCE 6 2.1. Variable power cooking control 6 2.2. Inverter power supply circuit 6 2.3. Turbo defrost, Auto cook 6 2.4. Sensor cooking 6 2.5. Steam sensor and digital programmer circuit 7 3 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING 8 3.1. Check ...

Page 5 - SCHEMATIC DIAGRAM

1 SCHEMATIC DIAGRAM 5 NN-SD452W / NN-ST462M / NN-ST452W

Page 6 - control; DESCRIPTION OF OPERATING SEQUENCE

2.1. Variable power cooking control High Voltage Inverter Power Supply (U) controls output powerby the signal from Digital Programmer Circuit (DPC). Powerrelay always stay on, but PWM (Pulse Width Modulation) signalcontrols microwave output power. NOTE: The ON/OFF time ratio does not correspond with...

Page 7 - programmer circuit

Explanation of the Auto Sensor Cooking process 1. During the first 10 second period there is no microwave activity. When calculating the T2 time by using theformula below make sure this 10 seconds is subtractedfrom the T1 time. In other words, T1 time starts at theend of the 10 second period. 2. T1 ...

Page 10 - DISASSEMBLY AND PARTS REPLACEMENT

4.1. Magnetron 1. Discharge the high voltage capacitor. 2. Remove 1 screw holding air guide A on the magnetron. 3. Remove 1 screw holding air guide A on cavity top plate. 4. Remove 1 screws holding thermistor on the magnetron. 5. Remove 1 screw holding air guide A on the wave guide, then remove the ...

Page 15 - COMPONENT TEST PROCEDURE

WARNING 1. High voltage is present at the output terminals of the High VoltageInverter (U) including aluminum heat sink during any cook cycle.2. It is neither necessary nor advisable to attempt measurement of thehigh voltage.3. Before touching any oven components, or wiring, always unplugthe power c...

Page 17 - output; MEASUREMENTS AND ADJUSTMENTS

6.1. Adjustment of primary latch switch, secondary latch switchand short switch. 1. Mount the Primary latch switch, the Secondary latch switch and the Short switch to the door hook assembly as shownin illustration. NOTE: No specific individual adjustments during installation of the Primary latch swi...

Page 18 - TROUBLESHOOTING GUIDE

7 TROUBLESHOOTING GUIDE DANGER: HIGH VOLTAGES 1. DO NOT RE-ADJUST PRESET CONTROL on the H.V.Inverter (U). It is very dangerous to repair or adjust without proper test equipment because this circuit generates very large current and high voltage. Operating a misaligned inverter circuit is dangerous. 2...

Page 21 - How to check the semiconductors using an OHM meter

7.4. Simple way of H.V. Inverter/magnetron troubleshooting Purpose: Simple way (3/23 seconds rule) of identifying whether it’s Magnetron, Inverter, or others. Set-up: The unit under question is connected through the Ammeter as shown below. Procedure: Follow the matrix table below to identify the pro...

Page 23 - EXPLODED VIEW AND PARTS LIST

8 EXPLODED VIEW AND PARTS LIST 8.1. EXPLODED VIEW 23 NN-SD452W / NN-ST462M / NN-ST452W

Page 30 - DIGITAL PROGRAMMER CIRCUIT

9 DIGITAL PROGRAMMER CIRCUIT 9.1. SCHEMATIC DIAGRAM (NN-SD452W) 30 NN-SD452W / NN-ST462M / NN-ST452W