Silver - Panasonic
Contents
1. CONDITION CHECK RESULT CAUSE REMEDY TEC ip Replace 1 Setting time does Check continuity Detective 3 ah down of secondary Pr INO secondary switch secondary switch when touching switch with START pad door closed L continuity _ Check the con nection between Defective Replace P C B gt gt connector and No comu assembly assembly P C B assembly Continuity Loose connection 3 en tightly 2 Fan motor or Defective fan oven lamp Check fan motor gt Abnormal motor y a do not turn on Defective oven Replace oven Check oven lamp Abnormal Normal TROUBLE 4 Oven seems to be operation but output power is low CONDITION CHECK RESULT CAUSE REMEDY Output is low Check the Lower than 90 of Decrease in power Suggest customer power source rating voltage source voltage contact local voltage with load electric power Normal Uy eo qualified electrician Disconnect the wire leads from anginal Defective P C B Replace P C B gt relay 2 and check assembly assembly on and off time with multitester Normal Measure the enam Defective Replace output power magnetron magnetron NOTE Refer to Page 52. 2 1 INSTALLATIONS 3 1 OPERATING INSTRUCTIONS 4 1 FEATURES Sita due 4 1 CONTROL PANE ee dece re rete Ram 4 1 OPERATING SEQUENGE 3 cette endete co eer En eee e sipe 4 2 SCHEMATIC DIAGRAM ts eto SE t ot e t ed esi 4 3 CIRCUIT DESCRIPTION iuc Sie beds Des 4 4 SERVICE INFORMATION nn n n 5 1 TOOLS AND MEASURING 5 1 MIGROWAVE LEAKAGE TEST ce tee Cette oes 5 1 MEASUREMENT OF MICROWAVE POWER OUTPUT aaa 5 3 DISASSEMBLY AND 8 5 3 INTERLOCK CONTINUITY TEST oe te ee ek teet tenen ere tnde ee lan 5 7 COMPONENT TEST PROCEDURE i t rn nun eedem 5 8 TROUBLE SHOOTING Ss iere iE Rte siegen rudi 5 12 EXPLODED VIEW nima a ok ann oae ou d tas y nue namen naa aenea eek mk RR RR 6 1 REPLACEMENT PARTS LIST n 7 1 SCHEMATIC DIAGRAM OF P C B an a aha 8 1 POWER LEVEL amp ACCESSORIES Control Complement Microwave Power for Variable Cooking Power level High 800 Watts Medium 550 Watts Med 440 W
3. 1m aJ o sl 8 50 si 52 N 54 AN 3 3 3 3 4 4 A300741V0ZP LOWER HINGE 4 LA keowoerrone CAPAGTTOR ICE ponts s woweze Pussen roor A09047W50BP CUSHION RUBBER 6 Baseplate 7 4 SCHEMATIC DIAGRAM 7 85 265VAC CN100 MOTOR D106 UF4002 ARA 2 E102 4704 25 RX L TRO R105 5 3 330R BUZL BUZZER 100 2208 4 3V 2 ZERO PCRI7C vee R36 E EE Tk 2 RE R8 2K key in EAS R9 2 key in 2 4 z m eum RIO 2 A3 2 Bc Ru RG amp 1 LARA CONTO UN ns R27 4K7 d SWD R2 AK 4148 wel R2 4K7 SWB R30 IKT NI 4 7 de LAMP FAN 4 MICRO GRILL KSCAN3 12 SDA KSCANO vec SHO9P26 28PIN O luF N Q6 R37 38 gt ss 1 7K 10k ET MOTOR Q7 58550
4. Turntable Motor PCB ASSEMBLY REMOVAL 1 Remove the control panel assembly from the cavity 2 Remove screws which hold the PCB to the control panel 3 Disconnect the flat cable from the PCB and take off the PCB 5 6 L INTERLOCK SYSTEM 1 INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage 2 MOUNTING OF THE PRIMARY MONITOR SECONDARY SWITCHES TO THE LATCH BOARD ADJUSTMENT DIRECTION t PRIMARY SWITCH MONITOR SWITCH a SECONDARY SWITCH 3 INSTALLATION AND ADJUSTMENT OF THE LATCH BOARD TO THE 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 screw Check for play in the door by pushing the door release button Door movement should be less than 0 5 mm 1 64 inch Don t push the door release button while making adjustment Make sure that the latch moves smoothly after adjustment are completed and that the screws are tight Make sure the primary monitor and secondary switches operate properly by following the continuity test procedure FIG 1 CAUTION CHECK THE CORRECT POSITION MAGNE
5. assembly assembly 5 13 TROUBLE 2 Oven does not operate at all Display window does not display any figures and no input is accepted CONDITION CHECK RESULT CAUSE REMEDY 1 Fuse blows Check continuity Continuity Malfunction of the Replace primary of monitor monitor switch and monitor switch with switches door closed Replace fuse No continuity Check continuity Replace primary capacitor and operate the unit Continuity Shorted contact at 7 of primary 4 the primary switch and monitor switch with switches door opened No continuity Disconnect one Normal Defective high Replace high side of the wire voltage capacitor voltage capacitor gt lead connected from transformer Ll F sebl ws oain Defective high volt Replace high volt to the high 9 age transformer age transformer voltage NOTE All these switches must be replaced at the same time Refer to page 5 6 5 7 5 14 TROUBLE 3 Display shows all figures set but oven does not start cooking while desired program times are set and START pad is touched
6. CAVITY i BR e THERMAL CUT OUT N 190 0 BR OVER SUPPLY R SINGLE PHASE RD ONLY FILTER ASSY FI FUSE O ee H V 8 CAPACITOR Nm INTERLOCK MONITOR SWITCH e 5 AW 77 i HV DIODE WF Ww W TC W TS WH BL 3 HIGH VOLTAGE TRANSFOMER OTOR RI BL W ELAY BL 3 5 SECONDARY INTERLOCK SWITCH y 00 BL qu CONTROL P W B ASS Y CONDITION NOTE DOOR CLOSED OD OVEN LAMP COOK OFF ED FAN MOTOR TURNTABLE MOTOR BEFORE SERVICING Discharge the high voltage Capacitor by shorting the negative high voltage Terminal of it to chassis ground 4 3 SYMBOL COLOR BR BROWN RD RED CIRCUIT DESCRIPTION GENERAL DETAILS The low voltage transformer supplies the necessary voltage to the micom controller when power cord is plugged in When the door is closed the primary switch is ON the secondary switch is ON and the monitor switch opens contact COM and NO WHEN SELECTING COOKING POWER LEVEL AND TIME The micom controller memorizes the function you set The time you set appears in the display window Each indicator light turns on to indicate that the stage has been set WHEN TOUCHING THE START PAD The coil of the relay is energized by the micom controller Power input is supplied to the high voltage transformer through the fuse to the primary switch and relay 2 Turntable
7. NOTE 1 When removing the magnetron make sure its dome does not hit any adjacent parts or it may be damaged 2 When replacing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition 3 After replacing the magnetron check for microwave leakage with a survey meter around the magnetron Microwave energy must be below the limit of 5 mW cm With a 275 ml water load Make sure that gasket is rigidly attached to the magnetron To prevent microwave leakage tighten the mounting screws properly making sure there is no gap between the waveguide and the magnetron Magnetron Magnetron Magnetron Gasket Waveguide Bracket Dome Waveguide J REMOVING THE TURNTABLE MOTOR 1 Remove the glass tray 2 Remove the pully shaft VERY CAREFULLY 3 Lay the unit down on its back 4 Remove the turntable motor cover The turntable base cover is easily removed by pinching the six parts with a wire cutting 5 Disconnect the leadwire from the turntable motor terminals 6 Remove the screw securing the turntable motor to the oven cavity ASS Y 7 After replacing the motor rotate the removed turntable motor cover 8 Fit the turntable motor cover s projecting part to the base plate slit NOTE 1 Remove the wire lead from the turntable motor VERY CAREFULLY 2 Be sure to grasp the connector not the wires when removing
8. Output is full when Disconnect the Defective P C B Replace P C B you set lower wire leads from assembly assembly power level relay 2 and check continuity relay 2 Operate the unit 5 17 EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS i f LEER SVIRU A BASE PLATE PARTS DOOR PARTS CONTROL PANEL PARTS LATCH BOARD PARTS 6 1 DOOR PARTS 6 2 CONTROL PANEL PARTS trn A ie II EE EMAL ur taa MANN 7 OVEN CAVITY PARTS LATCH BOARD PARTS 6 5 INTERIOR PARTS 6 6 BASE PLATE PARTS 6 7 REPLACEMENT PARTS LIST NOTE 1 When ordering replacement part s please use part number s shown in this part list Do not use description of the part 2 Important safety notice Components identified by A mark have special characteristics important for safety When replacing any of these components use only manufacture s specified parts For Model NN ST342M RPM Retno ParNameaDescrton PesSe Remans as AX eave poner jeweswze ror Doom unse o s A jewsswze poonsomema 3 s LA pono i s
9. oor neva Cono weweraneswron i _ _ escureneonsneer 1 Do _ 3 jeosssnvowze 3 3 as escureacketate i 3s Jio Der orto coven jwwoewze roter ame i mee Jarionervonzr i as ___ _ Jenackerwarensenune 3 s jewwowee Puers o 7 1 REPLACEMENT PARTS LIST For Model NN ST342M RPM A632641V0ZP TURNTABLE MOTOR A302041V0ZP DOOR HOOK A A614141V0ZP MICROSWITCH d EN E OA MONITOR EM E ieu TI AN 1 Aosone roze LEAD WIRE HARNESS 1 A momwee ruses A jwsvevze nosem f Wowwwoze rwworn _______ once 1 FANBLADE A ___ 1 LOWERHINGE _____ AN jeweevuze 1 steservoze CAPACITOR BRACKET __ _ AN _ 1 A woes f ease Atooeetvoze aueaenroor fa hosos7wsos CUSHION RUBBER 1 Baseplate 7 2 REPLACEMENT PARTS LIST NOTE 1 When ordering replacement part s please use part number s shown in this part list Do not use description of th
10. BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY A Do not operate or allow the oven to be operated with the door open B Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source and make repairs as necessary 1 interlock operation 2 proper door closing 3 seal and sealing surfaces arcing wear and other damage 4 damage to or loosening of hinges and latches 5 evidence of dropping or abuse C Before turning on microwave power for any service test or 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 components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is released to the owner E A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to release to the owner CAUTION MICROWAVE RADIATION DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY CONTENTS Page SAFETY PRECAUTIONS Inside front cover SPECIFICATIONS A nr 1 1 CAUTIONS
11. rotates PRIMARY FUSE SWITCH j MONITOR 2 SWITCH SECONDARY A 97 SWITCH MICOMCONTROLLER YN The fan motor rotates and cools the magnetron by blowing the air coming from the intake on the backplate The air is also directed into the oven to exhaust the vapor in the oven through the left side Cooking time starts counting down 3 2 volts AC is generated from the filament winding of the high voltage transformer This 3 2 volts is applied to the magnetron to heat the magnetron filament through two noise preventing choke coils A high voltage of approximately 2100 volts AC is generated in the secondary of the high voltage transformer which is increased by the action of the high voltage diode and charging of the high voltage capacitor The negative 4000 Volts DC is applied to the filament of the magnetron WHEN THE OVEN IS SET ANY LEVEL EXCEPT MAXIMUM The micom controller controls the ON OFF time of relay 2 by the applied signal to vary the average output 4 4 power of microwave oven as POWER LEVEL refer to page 1 1 WHEN THE DOOR IS OPENED DURING COOKING Both the primary switch and relay 2 are cut off primary winding voltage of the high voltage transformer ON OFF of relay 2 is coupled electrically with opening and closing of the secondary switch When the door is opened the secondary switch is opened a
12. should not be installed in any area where heat and steam are generated because they may damage the electronic or mechanical parts of the unit Do not install the oven next to a conventional surface unit or above a conventional wall oven 5 Use microwave oven in an ambient temperature less than 104 F 40 C 6 Place the microwave oven on a sturdy and flat 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 10cm EARTHING INSTRUCTIONS This microwave oven is designed to be used in a fully earthed condition It is imperative therefore to make sure it is properly earthed before servicing WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT The wires in this mains lead are colored in accordance with the following code Green and yellow Earth Blue Neutral Brown Live As the colors of the wires in the mains lead of this appliance may not correspond with the colored markings identifying the terminals in your plug proceed as follows The wire which is colored green and yellow must be connected to the terminal in the plug which is marked with the letter E or by the earth symbol or colored green or green and yellow The wire which is colored blue must be connected to the terminal in the plug which is marked with the letter N or colored black The wire which is colored brown must be connect
13. side edges of the case The outer case must be moved backward to be lifted off B POWER SUPPLY CORD 1 Remove the outer case 2 Disconnect two terminals and remove one screw of the earth terminal CAUTION DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING refer to page 2 1 C CONTROL PANEL ASSEMBLY 1 Disconnect the leadwire from the Timer motor 2 Remove the screws for securing the control panel 3 Lift control panel ASS Y from the oven by the tab unhooked D DOOR ASSEMBLY REMOVAL 1 Open the door 2 Remove two screws holding the Hinge to the Cavity Ass y CAUTION Be careful not to damage Door C by screwdriver 3 Lift up and pull the door NOTE 1 After replacing the door be sure to check that the primary switch monitor switch and secondary switch operate normally After replacing the door check for microwave energy leakage with a survey meter Microwave energy must be below the limit of 5 mW cm with a 275 ml water load 3 When mounting the door assembly to the oven assembly be sure to adjust the door assembly parallel to the chassis Also adjust so the door has no play between the inner door surface and oven frame assembly If the door assembly is not mounted properly microwaves may leak from the clearance between the door and the oven Remove door Assembly A A ES f N HES S 2 gt 2 gt NG Remove door Assembly
14. 3 for measuring of microwave power output 5 15 TROUBLE 5 No microwave oscillation even though oven lamp and fan motor Display operates properly CONDITION CHECK RESULT CAUSE REMEDY No microwave Disconnect the No continuity Defective P C B Replace P C B oscillation wire leads from assembly assembly relay 2 and check continuity Continuit of relay2 ne Operate the unit Check H V Defective high Replace high transformer none voltage voltage transformer transformer normal Check H V brormai Defective high Replace high capacitor voltage capacitor voltage capacitor normal Check H V Defective high Replace high diode panera voltage Diode voltage Diode normal Check Defective Replace Magnetron magnetron magnetron normal Check Defective Replace High voltage Diode Abnormal gt High voltage Diode High voltage Diode 5 16 TROUBLE 6 Oven does not cook properly when programmed for the set power level Operates properly on HIGH CONDITION CHECK RESULT CAUSE REMEDY
15. 50 sec Outside Dimensions 485 W x 287 H x 400 D mm Cavity Dimensions 315 W x 227 H x 349 D mm Net Weight 12 7kg approx Shipping weight 13 7 kg approx Specifications subject to change without notice p m GO anasonic Panasonic Corporation 2012 Unauthorized copying and distribution is a violation of law WARNING This product should be serviced only by trained qualified personnel This service manual covers products for following markets When troubleshooting or replacing parts please refer to the country identifications shown below for your applicable product specification For Peru Chile RPH For Panama Mexico CAUTION About lead free solder PbF Distinction of PbF PCB PCBs manufactured using lead free solder will have a PbF stamp on the PCB Caution Pb free solder has a higher melting point than standard solder Typically the melting point is 30 40 C higher Please use a high temperature soldering iron In case of the soldering iron with temperature control please set it to 370 10 e Pb free solder will tend to splash when heated too high about 600 C SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy PRECAUTIONS TO BE OBSERVED
16. EST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION WHEN REMOVING THE WIRE LEADS FROM THE PARTS BE SURE TO GRASP THE CONNECTOR NOT THE WIRES 5 11 TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER EVALUATE THE COMPLAINT CAREFULLY IF THE FOLLOWING SYMPTOMS APPLY PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL CAUTIONS 1 Check grounding before checking for trouble 2 Be careful of the high voltage circuit 3 Discharge the high voltage capacitor See page 2 1 4 When checking the continuity of the switches or of the high voltage transformer disconnect one lead wire from these parts and then check continuity with the AC plug removed To do otherwise may result in a false reading or damage to your meter 5 Do not touch any part of the circuitry on the digital programmer circuit since static electric discharge may damage this control panel Always touch yourself ground while working on this panel to discharge any static charge built up in your body CONDITION CAUSE REMEDY Microwave oven Inserting many plug into one Avoid using other electrical does not work
17. Order No MOD1208378CE Service Manual Microwave Oven Model No NN ST342M 25L Silver Latin America A WARNING This service information is designed for experienced repair technicians only and is not designed for use by the general public It does not contain warnings or cautions to advise non technical individuals of potential dangers in attempting to service a product Products powered by electricity should be serviced or repaired only by experienced professional technicians Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death IMPORTANT SAFETY NOTICE There are special components used in this equipment which are important for safety These parts are marked by A in the Schematic Diagrams Circuit Board Diagrams Exploded Views and Replacement Parts List It is essential that these critical parts should be replaced with manufacturer s specified parts to prevent shock fire or other hazards Do not modify the original design without permission of manufacturer Specifications NN ST342M RPM NN ST342M RPH Power Requirement 220 Volts AC 50 60 2 120 Volts AC 60 Hz 1 270 Watts 5 9A 50Hz 6 2A 60Hz 1 270 Watts 10 3 A Single phase 3 wire grounded Single phase 3 wire grounded Power Output 800 Watts full microwave power IEC60705 Microwave Frequency 2 450 MHz Magnetron 2M219J Timer 0 99 min and
18. R42 ATK 2 3 4 5 7 8 8 1 Panasonic
19. TRANSFORMER SEE PAGE 2 1 2 ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD 1 LITER OF WATER IN CONTAINER IN THE OVEN COMPONENTS TEST PROCEDURE RESULTS HIGH VOLTAGE TRANSFORMER Wire leads removed FILAMENT WINDING TERMINAL SECONDARY WINDING 1 Measure the resistance Ohm meter scale Rx1 Primary winding Approx 1 4 ohm Secondary winding Approx 90 ohm Filament winding Less than 1 ohm 2 Measure the resistance Ohm meter scale Rx1000 Primary winding to ground Normal Infinite Filament winding to ground Normal Infinite MAGNETRON Wire leads removed 1 Measure the resistance Ohm meter scale Rx1 Normal Less than 1 ohm Filament terminal 2 Measure the resistance Ohm meter scale Rx1000 Normal Infinite Filament to chassis 5 8 COMPONENTS TEST PROCEDURE RESULTS NOTE When testing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition HIGH VOLTAGE CAPACITOR Measure the resistance Ohm meter scale Rx1000 Terminal to terminal Normal Momentarily indicates several ohms and then gradually returns to 10M ohms Measure the resistance Ohm meter scale Rx1000 Terminal to case Normal HIGH VOLTAGE DIODE NOTE Some inexpensive meters may indicate infinite resistance in both direction Measure the conti
20. TRON H V TRANSFORMER H V CAPACITOR PRIMARY INTERLOCK CONTINUITY TEST WARNING FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS TYPE NO KW3A FOR SWITCHS A PRIMARY INTERLOCK SWITCH TEST When the door release button is depressed slowly with the door closed an audible click should be heard at the same time or successively at intervals When the button is released slowly the latches should activate the switches with an audible click If the latches do not activate the switches when the door is closed the switches should be a adjusted in accordance with the adjustment procedure Disconnect the wire lead from the primary switch Connect the ohmmeter leads to the common COM and normally open NO terminal of the switch The meter should indicate an open circuit in the door open condition When the door is closed the meter should indicate a closed circuit When the primary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch COMPONENTS TEST PROCEDURE B SECONDARY INTERLOCK SWITCH TEST Disconnect the wire lead from the secondary switch Connect the ohmmeter leads to the common COM and normally open NO terminals of the switch The meter should indicate a open circuit in the door open condition When the door is clos
21. as been brought into compliance f the oven operates with the door open the service personnel should Tell the user not to operate the oven Contact the manufacturer The service personnel should check all surface and vent openings for microwave leakage Check for microwave leakage after every servicing The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 4 mW cm Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage 5 1 NECESSARY MEASURING INSTRUMENTS TESTER VOLTS DC AC Ohmmeter Microwave survey meter Holaday HI 1500 HI 1501 Narda 8100 8200 Inch scale 600 cc non conductive material beaker glass or plastic inside diameter approx 8 5 3 2 in Cylindrical and made of borosilicate glass vessel max thickness 3 mm outside diameter approx 190mm height approx 90mm Glass thermometer 100 C or 212 F 1 deg scale MEASURING MICROWAVE ENERGY LEAKAGE e Pour 275 15 of 20 5 C 68 9 F water a beaker which 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 correct result When measuring the leakage always use the 2 inch bcm spacer supplied with the probe Operate the oven at its maximum output Measure the microw
22. atts Defrost 220 Watts 80 Watts Rating Label Location Accessories Instruction manual Glass Tray Roller Ring This microwave oven is designed for household use only It is not recommended for commercial purposes 1 1 CAUTIONS Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free from danger in ordinary use extreme care should be taken during repair DO NOT operate on a 2 wire extension cord during repair and use NEVER TOUCH any oven components or wiring during operation BEFORE TOUCHING any parts of the oven always remove the power plug from the outlet For about 30 seconds after the oven stops an electric charge remains in the high voltage capacitor When replacing or checking you must discharge the high voltage capacitor by shorting across the two terminals with an insulated screwdriver D CQ 4 AH Remove your watches whenever working close to or replacing the Magnetron NEVER operate the oven with no load NEVER injure the door seal and front plate of the oven cavity NEVER put iron tools on the magnetron NEVER put anything into the latch hole and the interlock switches area MICROWAVE RADIATION Personnel should not be exposed to the microwave energy which may radiate from the magnetron or other microwave generating device if it is improperly used or connection All input and outpu
23. ave radiation using and electromagnetic radiation monitor by holding the probe perpendicular to the surface being measured Move probe along shaded area Probe scanning speed Less than 2 5 cm sec 1in sec MEASUREMENT WITH OUTER CASE REMOVED When you replace the magnetron measure for microwave energy leakage before the outer case is installed and after all necessary components are replaced or adjusted Special care should be taken in measuring the following parts Circled area of below Fig Around the magnetron The waveguide WARNING AVOID CONTACTING ANY HIGH VOLTAGE PARTS AX DA SVS V MEASUREMENT WITH A FULLY ASSEMBLED OVEN After all components including the outer case are fully assembled measure for microwave energy leakage around the door viewing window the exhaust opening and air inlet openings Microwave energy leakage must not exceed the values prescribed below NOTE Leakage with the outer case removedless than 5 mW cm sq Leakage for a fully assembled oven Before the latch switch primary is interrupted with the door in a slightly opened position less than 2 mW cm sg 5 2 NOTES WHEN MEASURING Do not exceed meter full scale deflection The 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 gr
24. detiene temporalmente el proceso de cocci n Otro toque cancela todas sus instrucciones y la hora del d a aparece en la pantalla 13 Tecla de Encender Un toque permite al horno empezar su funci n Si la puerta est abierta la tecla Pausa Cancelar se oprime una vez durante la operaci n del horno la tecla de Encender debe oprimirse otra vez para reanudar el trabajo del horno Bip Cuando una tecla es presionada correctamente se escuchar un bip Si una tecla es presionada y no escucha un bip significa que la unidad no acept o no pudo aceptar la instrucci n El horno har 2 veces pip entre las etapas programadas Al final de cada programa completado el horno har 5 veces bip 4 AUTO WEIGHT DEFROST Desired Stop Desired Cancel weight su 5 AUTO WEIGHT REHEAT Desired Stop Desired Cancel on gt weight Start 6 CHILD LOCK This oven has a CHILD LOCK feature TO SET CHILD LOCK Press start pad three times L appear in the display TO CANCEL CHILD LOCK Press stop cancel pad three times gt L disappears SCHEMATIC DIAGRAM MAGNETRON PRIMARY INTERLOCK SWITCH UPPER
25. e part 2 Important safety notice Components identified by A mark have special characteristics important for safety When replacing any of these components use only manufacture s specified parts For Model NN ST342M RPH perno Prnames sserpien eval 2 __ Door Au Ooorarscreoreysmer s ewewue oos Ji Da ___ T gt Ls A pese i s LA ewm _______ p emesve a s fremevoze Jooorkeva Jo 5407 peovarroune wewenane snnt 3 Ls peserrouee escurcreon sheer 3 Pio pessevoze uemerane suns a LA escurcreowease i ememwe Jo Las perzrarvozo _ i i Lm Jreossenvoze Jozune coven T La jemoswze router ana 3 2647 Jenmooanvonzp oaawereoowy 3 as ___ _Jenackerwarensemune 3 La pues 7 3 REPLACEMENT PARTS LIST For Model NN ST342M RPH A632641T0RP TURNTABLE MOTOR IEEE A302041V0ZP DOOR HOOK A A614141V0ZP MICROSWITCH 27 28 29 MICROSWITCH 2 MICHOSWITCHMONITOR 2 172 aces 3 jesse ccomwmue O fonao eewmewenss LA
26. ed meter should indicate an closed circuit When the secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch C MONITOR SWITCH TEST Disconnect the wire lead from the monitor switch Connect the ohmmeter leads to the common COM and normally closed NC terminals of the switch The meter should indicate closed circuit in the door open condition When the door is closed meter should indicate an open circuit When the monitor switch operation is abnormal replace with the same type of switch NOTE After repairing the door or the interlock system it is necessary to do this continuity test before operating the oven RESULTS SWITCHES Wire leads removed Check for continuity of the switch with an Ohm meter Door closed Door open Primary Switch Type No KW3A e t c NO d ES a Monitor Switch Type No KW3A NC COM Secondary Switch IE S NO NOTE After checking for the continuity of switches make sure that are correctly connected Type No KW3A 5 7 COMPONENT TEST PROCEDURE CAUTIONS 1 DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE
27. ed to the terminal in the plug which is marked with the letter L or colored red OPERATING INSTRUCTIONS FEATURES See Through oven window Oven Front Plate Control Panel Safety Door Lock System Glass Tray Roller Ring CONTROL PANEL Panasonic Alto Medio Baja 1 1 roi 8 Descongelaci n Nivel de Potencia Descongelaci n Turbo Recalentamiento 4 10k 5 Automatica m Cocci n Autom tica Ds Verduras 2 5 Verduras Congeladas 6 Cocci n Papas Autom tica 6 9 Pasta Fresca Pasta Seca m orci n cm 7 Pescado Pollo Cron meti 9 Pausa Cancelar Encender 1 0 NN ST342M 4 1 NN ST342M RPM Display Window Micro Power Pad Time Pads Turbo Defrost Pads Auto Reheat Pad Auto Cook Pads Serving Weight Pad Timer Clock Pad Stop Reset Pad Before cooking One tap clears all your instructions During cooking One tap temporarily stops the cooking process Another tap cancels all your instructions and colon or time of day appears in the display window 10 Start Pad After cooking program setting one tap allows oven to begin functioning If door is opened or Stop Reset Pad is pressed once during oven operation Start Pad must be pressed again to restart oven Beep Sound When a pad is pressed correctly a beep will be heard If a pad is pressed and no beep is hea
28. iately before the water is added to the vessel After addition of the water to the vessel the load is immediately placed on the center of the turntable which is in thd lowest position and the microwave power switched on The time T for the temperature of the water to rise by a value A T of 10 2 K is measured where T is the time in seconds and AT is the temperature rise The initial and final water temperatures are selected so that the maximum difference between the final water temperature and the ambient temperature is 5 K The microwave power output P in watts is calculated from the following formula 4187 x AT 0 55 X T2 To XM T Tz Temperature after heating To 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 included about 3 sec The water is stirred to equalize temperature throughout the vessel prior to measuring the final water temperature Stirring devices and measuring instruments are selected in order to minimize addition or removal of heat WATER LOAD EP SZ TURNTABLE NOTES For simple tests of micromave power output conduct it by heating one litre water for one minute minimum temperature rise should be 6 C DISASSEMBLY AND ADJUSTMENT A OUTER CASE REMOVAL 1 Disconnect the power supply cord from the outlet 2 Remove the screws from the rear and along
29. ip portion of the handle A false reading may result if the operator s hand is between the handle and the probe When testing near a corner of the door keep the probe perpendicular to the surface making sure the probe horizontally along the oven surface this may possibly cause probe damage RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT After adjustment and repair of any microwave energy interruption or microwave energy blocking device record the measured values for future reference Also enter the information on the service invoice The microwave energy leakage should not be more than 4 mW cm sq after determining that all parts are in good condition functioning properly and genuine replacement parts which are listed in this manual have been used At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer MEASUREMENT OF MICROWAVE POWER OUTPUT Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of 100025 g of potable water The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190mm The oven and the empty vessel are at ambient temperature prior to the start of the test The initial temperature T1 of the water is 10 2 C It is measured immed
30. n 74 e F d VA 5 4 E HIGH VOLTAGE TRANSFORMER REMOVAL 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 F ORIFICE ASSEMBLY REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from fan motor noise filter and high voltage capacitor 3 Remove the two screws holding the orifice ASS Y to the oven cavity and remove the high voltage diode earth screw 4 Remove the screw of the capacitor bracket 5 Remove the two screws holding the fan motor ASS Y to the Orifice ASS Y G HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL 1 Discharge the high voltage capacitor 2 Disconnect the leadwire from fan motor noise filter and high voltage capacitor 3 Remove the screw holding the Orifice the oven earth screw 4 Remove the screw holding the high voltage capacitor bracket AIR GUIDE ASSEMBLY REMOVAL 1 Disconnect the leadwire from lamp A C Relay and monitor resistor and magnetron 2 Remove the screw to the cavity I MAGNETRON REMOVAL 1 Disconnect the leadwire from the high voltage transformer and high voltage capacitor 2 Remove the air guide 3 Carefully remove the mounting screws holding the magnetron and the waveguide 4 Remove the magnetron until the tube is clear from the waveguide
31. nd when the door is closed the secondary switch is closed The cooking time stops counting down Relay stops functioning As the door is opened if the contact of primary switch and relay 2 and or secondary switch fails to open the fuse opens due to the large current surge caused by the monitor switch activation which in turn stops magnetron oscillation PRIMARY SWITCH FUSE MONITOR SWITCH TRANS FORMER NDARY 97 SWITCH MICOM CONTROLLER SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS Tools normally used for TV servicing are sufficient Standard tools are listed below Diagonal pliers Long nose pliers Phillips screwdriver Flat blade screwdriver Wrench size 5mm Nutdriver size 5mm Adjustable wrench Soldering iron Solder Vinyl insulation tape Polishing cloth MICROWAVE LEAKAGE TEST CAUTIONS Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to servicing The service personnel should inform the manufacture importer or assembler of any certified oven unit found to have a microwave emission level in excess of 5 mW cm and should repair any unit found to have excessive emission levels at no cost to the owner and should ascertain the cause of the excessive leakage The service personnel should instruct the owner not to use the unit until the oven h
32. nuity Forward Ohm meter scale Rx10000 Normal Continuity Abnormal e Measure the continuity Reverse Ohm meter scale Rx10000 5 9 Normal Abnormal Continuity COMPONENTS TEST PROCEDURE RESULTS FUSE Check for continuity of the fuse with an Normal Abnormal multi meter NOTE If the fuse is blown check the 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 Replace just the fuse if the switches operate normally THERMAL Below specified Above specified CUT OUT LN temperature temperature gt 5274 LI L V Transformer of P C B Check for P C B connector Normal Abnormal Refer to schemetic diagram Disconnect the 3 pin connector from P C B ze RELAY 2 OF P C B Cooking Start Wire leads removed Note Relay Relay 1 Fan motor N Turntable motor Oven lamp Relay 2 Microwave 5 10 COMPONENTS TEST PROCEDURE RESULTS FAN MOTOR Wire leads removed Measure the resistance Ohm meter scale R x 100 Normal 100 500 2 Abnormal ee or several TURNTABLE MOTOR Wire leads removed Measure the resistance Ohm meter scale R x 1000 Normal Approx 100 200K Abnormal ce or several NOTE A MICROWAVE LEAKAGE T
33. one or more numbers in display One or more digits in the display are not lighting Display indicates a number different from one touched for example key in 5 and 3 appears in the display Specific numbers for example 7 or 9 will not display when key pad is touched Display does not count down with time blinking or up with clock operation Display obviously jumps in time while counting down Display counts down too fast while cooking Each indicator light does not turn on after setting cooking cycle different from one touched 4 Random programming when touching other pads 5 Display is fixed at some figure and can not accept any input 11 Display time of day does not reappear when cooking is finished 12 Beep sound is not heard when correct key is touched CONDITION CHECK RESULT CAUSE REMEDY 1 No input can be Check the conn Continuity Defective PCB Replace PCB programmed ection between assembly assembly membrane key assembly and we Loose Connect them PCB assembly Pe connection tightly 2 Some inputs Replace key Everything works Defective key Replace key cannot be membrane as specified membrane membrane programmed assembly and assembly assembly check operation Still have 3 Display shows a trouble Defective PCB Replace PCB number or figure
34. plug outlet and using appliances when you use the them at the same time microwave oven causes overloading Microwave oven plug is not Insert microwave oven plug inserted tightly securely Output power is too low Low AC input voltage gt Use the microwave oven at adequate line voltage Food temperature is too low gt This may not be a defect It is possible that the food should be cooked for a longer time period Sparks occurring Using metallic ware and Do not use metallic ware for allowing it to touch the oven cooking except where noted wall in the cooking guide Ceramic ware trimmed in Do not use any type of gold or silver powder is used cookware with metallic trimming Uneven cooking Inconsistent intensity of gt 1 Wrap the thinner part with microwave by their aluminum foil characteristics 2 Use plastic wrap or lid 3 Stir once or twice while cooking soup cocoa or milk etc Turntable drags or makes d E e nn nn noise 9 Excessive weight on tray or Distribute food evenly Cook improperly balanced smaller portions and or use lighter weight cookware 5 12 TROUBLE 1 The following visual conditions indicate a probable defective control circuit Incomplete segments e Segment missing Partial segment missing e Digit flickering NOTE Slight flickering is normal Colon does not turn on or blink A distinct change in the brightness of
35. rd the unit did not or cannot accept the instruction The oven will beep twice between programmed stages At the end of any complete program the oven will beep 5 times CONTROL PANEL Panasonic Descongelaci n g kg M s Menos Alta Potencia 800W 2 1 ms 3 4 mL m 6 7 5 8 9 10 11 1 2 Pausa Cancelar Encender 1 3 NN ST342M OPERATING SEQUENCE The following is a description of component functions during oven operation 1 SETTING THE CLOCK Stop Set the time Cancel Clock gt is gt Clock NOTE You can set 24 hour clock 2 CANCEL FUNCTION Touch the Stop Cancel pad whenever you need to cancel an entry or a function currently in use The display will either return to the last item entered or to the clock 3 MICROWAVE COOKING Stop Cancel Desired cooking time Desired cooking power Start NN ST342M RPH 1 Tecla de Palomitas de maiz 2 Tecla de Recalentamiento Autom tico 3 Tecla de Cocci n Autom tica 4 Tecla de Potencia 5 Tecla de Descongelaci n Autom tica 6 Tecla de Porciones Peso 7 Tecla de Minuto Autom tico 8 Tecla de M s Menos 9 Teclas num ricas 10 Tecla de Cron metro 11 Tecla de Reloj 12 Tecla de Pausa Cancelar Antes de Cocinar Un toque habilita sus instrucciones Durante la cocci n Un toque
36. t microwave connections waveguide flange and gasket must be secure never operate the device without a microwave energy absorbing load attached Never look into an open waveguide or antenna while the device is energized Proper operation of the microwave oven requires that the magnetron 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 installing the magnetron ANTENNA GASKET COOLING FIN FILAMENT TERMINALS MAGNETRON CHASSIS GROUND MAGNETRON THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL INSTALLATIONS BEFORE YOU BEGIN READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY INSTALLING 1 Empty the microwave oven and clean inside it with a soft damp cloth Check for damage such as misaligned door damage around the door or dents inside the cavity or on the exterior 2 Put the oven on a counter table or shelf that is strong enough to hold the oven and the food and utensils you put in it The control panel side of the oven is the heavy side Use care when handling 3 Do not block the vent and the air intake openings Blocking vent or air intake openings can cause damage to the oven and poor cooking results Make sure the microwave oven legs are in place to ensure proper air flow 4 The oven
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