Panasonic NN-ST342M, Service Manual

Page 1: ...y Dimensions Net Weight Shipping weight Specifications subject to change without notice 1 270 Watts 5 Single phase 3 wire grounded 2 450 MHz 2M219J Volts AC 50 60Hz 220 800 Watts full microwave power...

Page 2: ...inspection within the microwave generating compartments check the magnetron wave guide or transmission line and cavity for proper alignment integrity and connections D Any defective or misadjusted co...

Page 3: ...2 SCHEMATIC DIAGRAM 4 3 CIRCUIT DESCRIPTION 4 4 SERVICE INFORMATION 5 1 TOOLS AND MEASURING INSTRUMENTS 5 1 MICROWAVE LEAKAGE TEST 5 1 MEASUREMENT OF MICROWAVE POWER OUTPUT 5 3 DISASSEMBLY AND ADJUSTM...

Page 4: ...t recommended for commercial purposes DESCRIPTION Microwave Power for Variable Cooking Power level ITEM Control Complement Rating Label Location Accessories Glass Tray Ro R ller ing Instruction manual...

Page 5: ...ron be assembled to the waveguide and cavity Never operate the magnetron unless it is properly installed Be sure that the magnetron gasket is properly installed around the dome of the tube whenever in...

Page 6: ...at surface at least 10 cm 4 inches from the wall 7 Place the microwave oven as far away as possible from TV RADIO COMPUTER etc to prevent interference EARTHING INSTRUCTIONS This microwave oven is desi...

Page 7: ...king time of day appears in the display window 10 Start Pad After cooking program setting one tap allows oven to begin once during oven operation Start Pad must be pressed again process Another tap ca...

Page 8: ...3 4 5 6 7 8 9 10 Tecla de Palomitas de maiz Tecla de Recalentamiento Autom tico Tecla de Cocci n Autom tica 12 13 Tecla de Potencia Tecla de Descongelaci n Autom tica Tecla de Porciones Peso Tecla de...

Page 9: ...SCHEMATIC DIAGRAM 4 3...

Page 10: ...ge capacitor The negative 4000 Volts DC is applied to the filament of the magnetron WHEN THE OVEN IS SET AT ANY LEVEL EXCEPT MAXIMUM The micom controller controls the ON OFF time of relay 2 by the app...

Page 11: ...ich is graduated to 600 cc and place the beaker on the center of the turntable Set the energy leakage monitor to 2450 MHz and use it following the manufacturer s recommended test procedure to assure c...

Page 12: ...test probe must be removed no faster than 1 inch sec 2 5 cm sec along the shaded area otherwise a false reading may result The test probe must be held with the grip portion of the handle A false read...

Page 13: ...0 55 X T2 T0 X M T T2 Temperature after heating T0 Temperature of bowl M Weight of bowl is measured while the microwave generator is operating at full power Magnetron filament heat up time is not inc...

Page 14: ...MOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from magnetron high voltage transformer and capacitor 3 Remove the screw holding the high voltage transformer to the baseplate to...

Page 15: ...SS Y 7 After rep the motor rotate the removed turntable motor cover 8 Fit the turntable motor cover s projecting part to the base plate slit glass tray lacing Base plate NOTE 1 Remove the wire lead fr...

Page 16: ...OVEN ASSEMBLY Mount the latch board to the oven assembly Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed Tighten the mounting scre...

Page 17: ...circuit in the door open condition When the door is closed meter should indicate an closed circuit When the secondary switch operation is abnormal make the necessary adjustment or replace the switch...

Page 18: ...DURE RESULTS HIGH VOLTAGE TRANSFORMER Wire leads removed MAGNETRON Wire leads removed 1 Measure the resistance Ohm meter scale Rx1 Primary winding Secondary winding Filament winding 2 Measure the resi...

Page 19: ...10000 Measure the continuity Reverse Ohm meter scale Rx10000 Normal Momentarily indicates several ohms and then gradually returns to Normal Normal Abnormal Continuity NOTE When testing the magnetron b...

Page 20: ...primary the secondary and the monitor switches H V D and H V C before replacing the fuse If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time R...

Page 21: ...the resistance Ohm meter scale R x 1000 Normal Abnormal or several Normal Approx 100 200K Abnormal or several NOTE A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY...

Page 22: ...does not work Inserting many plug into one plug outlet and using them at the same time causes overloading Microwave oven plug is not inserted tightly Output power is too low Low AC input voltage Food...

Page 23: ...ng cooking cycle 11 Display time of day does not reappear when cooking is finished 12 Beep sound is not heard when correct key is touched 5 13 TROUBLE 1 The following visual conditions indicate a prob...

Page 24: ...h volt age transformer Malfunction of the monitor switch Replace primary and monitor switches Check continuity of monitor switch with door closed Check continuity of primary switch with door opened Di...

Page 25: ...continuity of secondary switch with door closed Check fan motor Check oven lamp Abnormal Abnormal Normal Defective fan motor Defective oven lamp Replace fan motor Replace oven lamp Loose connection C...

Page 26: ...voltage transformer Check H V transformer normal normal Abnormal Defective high voltage Diode Replace high voltage Diode Check H V diode Abnormal Defective high voltage capacitor Replace high voltage...

Page 27: ...set power level Operates properly on HIGH CONDITION CHECK RESULT CAUSE REMEDY Output is full when you set lower power level Abnormal Disconnect the wire leads from relay 2 and check continuity relay...

Page 28: ...6 1 EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS DOOR PARTS...

Page 29: ...6 2 DOOR PARTS D04 05 S03 D06 01 05 08 D03 D 1 2 3 4 5 6 7 8...

Page 30: ...6 3 CONTROL PANEL PARTS C 05 C18 S03 C01 C55 C 11 15 12 9 10...

Page 31: ...6 4 OVEN CAVITY PARTS 21 25 24 27 26 19 22 64...

Page 32: ...6 5 LATCH BOARD PARTS 28 29 29 30 32...

Page 33: ...INTERIOR PARTS 6 6 34 37 38 39 40 41 42 43 44 45 48...

Page 34: ...6 7 BASE PLATE PARTS 49 50 51 52 54 55 63 58 58 58 58...

Page 35: ...1V0MZP Door AU DoorA ScreenB Silver 1 ScreenB Silver 3 5 4 A317641V0ZP TOP DOOR HINGE 1 5 6 7 A323041V0ZP DOOR KEY SPRING 1 7 8 A301841V0ZP DOOR KEY A 1 9 10 A630Y41T0MRM MEMBRANE SWITCH U 1 9 A833741...

Page 36: ...41V0ZP ORIFICE 1 45 FAN BLADE 1 45 FAN BLADE 1 48 2M219J MAGNETRON 1 49 A300741V0ZP LOWER HINGE 1 50 51 A618841V0ZP CAPACITOR BRACKET 1 52 52 54 55 A100141V0ZP BASE 1 58 A100841V0ZP RUBBER FOOT 4 63 A...

Page 37: ...A41V0MZP Door AU DoorA ScreenB Silver 1 ScreenB Silver 3 5 4 A317641V0ZP TOP DOOR HINGE 1 5 314541V0ZP DOOR SCREEN A 1 6 7 A323041V0ZP DOOR KEY SPRING 1 8 A301841V0ZP DOOR KEY A 1 9 10 A630Y41T0MRP ME...

Page 38: ...44 ORIFICE 1 45 A400841V0ZP FAN BLADE 1 48 2M219J MAGNETRON 1 49 A300741V0ZP LOWER HINGE 1 50 51 A618841V0ZP CAPACITOR BRACKET 1 52 54 55 A100141V0ZP BASE 1 58 A100841V0ZP RUBBER FOOT 4 63 A09047W50B...

Page 39: ...27 4K7 R28 4K7 R29 4K7 R30 4K7 R31 4K7 1 2 3 4 5 6 7 8 9 10 CN2 CON10 B C E Q1 S8050 1 2 GND DOOR CN2 E C B Q6 S8550 B C E Q2 S8050 B C E Q3 S8050 1 2 3 4 RLY1 GRIIL 1 2 3 4 RLY2 MICRO 1 2 3 4 RLY3 LA...

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