Service Manual - Appliance Factory Parts
Contents
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3. and NC of the Interlock Monitor must close when the door is opened After adjusting the Interlock Monitor Switch make sure that it is correctly connected Mounting of the primary monitor secondary switches to the latch board Door Hook Secondary Interlock Switch Primary Interlock Switch Figure 22 a LATCH 0 1 64 Figure 22 b Door Hook 0 1 64 CHECK THE DOOR LATCH AND SWITCH CLOSING NOTE The outer cover of the microwave oven is removed 1 Set the microwave oven on its side so that you can see the latch board and the switches as shown in Figure 22 a 2 Close the door tightly and check gaps A and B to be sure they are no more than 1 64 0 5 mm See Figure 22 b for close up view of gaps A and B door latches If all gaps are less than 1 64 0 5 mm adjustment of the latch board may not be necessary Go to Steps 5 and 6 to check the sequence of the switches NOTE To correct sequence of the Primary Interlock Switch Secondary Interlock Switch and the Interlock Monitor Switch is very important If any gap is larger than 1 64 0 5 mm you will need to adjust the latch board Go to step 3 and follow all steps in order ADJUST THE LATCH AND SWITCH CLOSING 3 Loosen the two screws holding the plastic latch board as shown 4 With the oven door closed tightly move the latch board upward toward the top of the oven and or away from the door latch until the gaps are
4. NC NC NC NC NC NC 13 4A fA A A Y Y Figure 26 1 2 3 4 5 6 7 8 9 10 11 12 13 Figure 27 7 17 COMPONENTS TEST PROCEDURES RESULTS inui POWER ll ee 2 Check for continuity of relay 7 with an ohm meter LEVEL N Remove wire leads from relay 7 and 1 4 sec 18 sec operate the unit 2 6 sec 16 sec 3 8 sec 14 sec 4 10 sec 12 sec RELAY 5 12 sec 10 sec 6 14 sec 8 sec 7 16 sec 6 sec 8 18 sec 4 sec 9 20 sec 2 sec Figure 28 10 22 0 CAUTION The relay connector 2 White and 5 Red must be correctly connected Relay 6 These two connectors are not inter changeable NOTES A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR 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 B CHECKOUT PROCEDURES 1 CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION REPLACE BLOWN FUSE WITH 20 AMPERE FUSE PROBLEMS CAUSES Fuse blows immediately after the door is closed Improper operation of the primary interlock secondary Fuse blows immediately after the door is opened interlock switches and or the interlock monitor switch Fuse blows when the door is closed and START Malfunction of the high voltage transformer the high key is touched voltage capacitor including the diode
5. 3 Remove the F P C connector from the terminal socket Plastic fastener Connector Terminal socket Figure 4 Plastic fastener Connector Terminal socket Figure 5 HOW INSERT THE F P C CONNECTOR Follow the steps below as illustrated in Figures 6 and 7 to insert the F P C connector 1 Insert the F P C connector into the terminal Socket securely with the fingers 2 Hold the plastic fastener with thumb and forefinger of the other hand and push it slowly into the terminal socket Figure 6 NOTE When reconnecting the F P C connector make sure that the holes on the F P C connector are properly engaged with the hooks on the plastic fastener Lock the level of the plastic fastener into the hook of the terminal socket securely by releasing the fingers Figure 7 Plastic fastener Connector Terminal socket Figure 6 Plastic fastener Connector Terminal socket Figure 7 B REMOVING THE OUTER CASE Figure 8 1 Remove the vent grille by removing two screws securing it to the outer case 2 Remove two screws securing it to the front bracket 3 Remove two screws securing it to the air duct 4 Remove the wall mounting plate by removing the two screws securing it to the outer case Vent Grille 5 Remove the base plate by removing six screws Figure 8 securing it to the outer case Remove the Mount from the out case by removing two screws
6. 2M214 39F Capacitor 1 0uF 2 1 KV AC Diode 350mA 9 0 KV 125 V 30W 125 V 30W Digital up to 99 mim 99 sec in each cooking stage 291556 W x167ne 153 8 D 197 8 W x8 5ne 143 16 D 1 5 Owner s Manual amp Cooking Guide Installation Manual Exhaust Adapter Exhaust Damper Mounting Kit and Two Filters Rotating Ring Assembly 1 1 CAUTIONS Unlike other appliances the microwave oven is high voltage and high current equipment 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 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 All input and output microwave connections repair and use waveguide flange and gasket must be secure NEVER TOUCH any oven components or wiring during never operate the device without a microwave operation energy absorbing load attached BEFORE TOUCHING any parts of the oven always Never look into an open waveguide or antenna remove the power plug from the outlet while the device is energized 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 Proper operation of the microwave oven requires that voltage c
7. amp COOK OFF MODE 120 VAC 60Hz SINGLE PHASE ONLY FUSE 20A O Di BK a o BK L N WH MICRO COMPUTER BOARD OVEN VENT MOTOR GND THERMOSTAT 1 WH 90 C 194 F 35 H RD OVEN LAMP L V TRANSFORMER p TE 4 BL WH BL RY3 T 0 L B WH EN HT S CONDENSER C L HIGH RY2 H IL Bk C L LOW BL WH COOKTOP of c lt EH x LAMPS BL WH RY5 6 4 CY WH VM LO E 8 IL SECONDARY node HK po N 313 C KM e 2 2 NO BK E 11 NO e NO PRIMARY SWITCH BOTTOM TURNTABLE WH 4 MOTOR RY7 3 4 WH NC C MONITOR SWITCH MIDDLE THEMISTOR BK O 00000000000000 o e H V TRANSFORMER 14 H V CAPACITOR ET 5 1 MATRIX CIRCUIT FOR TOUCH KEY BOARD 19 1 K FAN TIMER CHICKEN START PIECE FROZEN 2 5 2 GENERAL INFORMATION FOR SERVICE GENERAL PRECAUTIONS IN USE A Never operate the unit when it is empty Operating the oven with no load may shorten the life of the magnetron Whenever cooking dry foods dried fish bread etc or
8. voltage Systems the interlock switches the door sensing and the relay check good Proper temperature measurement is not obtained The buzzer does not sound or continues to sound Some segments of one or more digits do not light up or they continue to light up or segments light when they should not The unit with a normal relay continuously operates 6 7 8 9 Wrong figures appear The figures of all digits Some of the indicators do no flicker light up The clock does not keep time properly I a NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON 7 20 yano jeuuoN yono 71 2 pue abed LS 4012euu09 Jaye jo eouejsiseJ a nseoyy oe1uoo joejuoo JEULON 10910 J00d E LS Jo eouejsisei F joejuoo amp UJ0N pueog yo joejuoy suny 1 ueuM 981109 Jo pue sjequunu 1284409 mous jou saop ejdsig g W318OHd T 1 eouelsiseJ Suonoeuuoo i 109110 eDeyoA 1 LN
9. EXPOSURE TO EXCESSIVE MICROWAVE ENERGY A Do not operate or allow the oven to be operated with compartments check the magnetron waveguide or the door open transmission line and cavity for proper alignment B Make the following safety checks on all ovens to be integrity and connections serviced before activating the magnetron or other D Any defective or misadjusted components in the microwave source and make repairs as necessary interlock monitor door seal and microwave 1 Interlock operation generation and transmission systems shall be 2 Proper door closing repaired replaced or adjusted by procedures 3 Seal and sealing surfaces arcing wear and other described in this manual before the oven is released damage to the owner 4 Damage to or loosening of hinges and latches E A microwave leakage check to verify compliance with 5 Evidence of dropping or abuse the Federal Performance Standard should be C Before turning on microwave power for any service performed on each oven prior to release to the owner test or inspection within the microwave generating FOREWORD Read this Manual carefully Failure to adhere to or observe the information in this Manual may result in exposing yourself to the Microwave Energy normally contained within the oven cavity TABLE OF CONTENTS Page SAFETY PREGAUTIONS 4 a ero give ada den dg Inside front page SPECIFICATIONS sists sah etuer eon Dee eet ee
10. and notification after monitor should initially be set to the highest scale measurement 2 To prevent false readings the test probe should be held by the grip portion of the handle only and moved along the shaded area in Figure no faster than 1 inch sec 2 5cm sec 3 Leakage with the outer panel removed less than 5mW cm 4 Leakage for a fully assembled oven with door normally closed less than 2mW cm 1mW cm for Canada A After any adjustment or repair to a microwae oven a leakage reading must be taken Record this leakage reading on the repair ticket even if it is zero A copy of this repair ticket and the microwave leakage reading should be kept by repair facility B Should the radiation leakage be more than 2mW cm after determining that all parts are in good condition functoning properly and genuine replacement parts as listed in this manual have been used immediately 5 Leakage for a fully assembeld oven Before the notify PASC latch switch primary is interrupted while pulling the door less than ZmW cm 4 At least once a year have the radiation A Pour 275 15 9025 1 202 of 20 5 68 9 F water in a beaker which is graduated to 600cc and place in the center of the oven B Set the radiation monitor to 2450MHz and use it monitor checked for calibration by its manufacturer following the manufacturer s recommended test Move probe along shaded area procedeu
11. deed te ete ite tid etin ee gs 1 1 GAUTIONS 232 2 eee A AA t A te baa eet ERE UR aet d etu 2 1 INSTAEEATIONS date med beca 3 1 FEATURE DIAGRAMA dedu eta dea al al oce ooa a da cus 4 1 CONTROL PANEE 5 reet tet deste tds 4 2 OVERALL CIRCUIT 5 1 SCHEMATIG DIAGRAM itecto te eR n ehe d fea eaae enden 5 1 MATRIX CIRCUIT FOR 2 2 4 4 4 2 2 00 nrnn nnne rsen nennt nnn 5 2 GENERAL INFORMATION FOR 204 440002 101 00 ener tnr en err sn nennen nennen nennen nnns 6 1 GENERAL PRECAUTIONS IN USE sse eene entente nnns 6 1 OPERATION c theta noie ate uber 6 1 FEATURES AND SPECIFICATIONS FEATURES terere trennen enne 6 1 SERVICE INFORMATION ete ibn eie ttum Da rd a pera 7 1 PRECAUTIONS AND REPAIR SERVICE 5 7 1 PROCEDURE FOR MEASURING MICROWAVE ENERGY 7 2 POWER OUTPUT MEASUREMENT rint inr intr 7 8 DISASSEMBLY INSTRUCTIONS oeni taea aa e aa a a trit trn nenne trente nnne nnn 7 4 INTERLOCK SYSTEM etie A rete Eu RR FERE IE 7 12 INTERLOCK CONTIN
12. 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 COMPONENTS TEST PROCEDURE RESULTS SWITCHES Check for continuity of the Wire leads removed switch with an Ohm meter Door open Primary Switch ER Monitor Switch Secondary Switch ES connected correctly NOTE After checking for the continuity of switches make sure that they are WARNING FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS TYPE NO SZM V16 FA 63 OR VP 533A OF OR V 5230Q FOR PRIMARY SWITCH TYPE NO SZM V16 FA 62 OR VP 532A OF OR V 5220Q FOR MONITOR SWITCH TYPE NO SZM V15 FA 63 TEST AND CHECKOUT PROCEDURES AND TROUBLE SHOOTING CAUTIONS DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVINGING THE CABINET FROM THE UNIT PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER SEE FIGURE 23 ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD 1 LITER OF WATER IN CONTAINER IN THE OVEN A TEST PROCEDURES COMPONENTS TEST PROCEDURES
13. less than 1 64 0 5 mm Hold the latch board tightly in this position until you check the sequence of the switches in steps 5 and 6 TEST THE LATCH AND SWITCH SEQUENCE 5 Open the oven door slowly Watch the door latch the Secondary Switch Release Rod and Lever on the switches to make sure they are zero to the body of the switches in the following sequence Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Switch Adjust the latch board until the switches operate in this sequence See Steps 3 and 4 Close the oven door slowly and be sure it is tightly closed Watch the three switches to make sure they are zero to the body of the switches in the following sequence Interlock Monitor Switch Primary Interlock Switch Secondary Interlock Switch NOTE The Interlock Monitor Switch is an added safety check on the Primary and Secondary Interlock Switches If the Primary and Secondary Interlock Switches allow the oven to operate with the door open the Monitor Switch will blow the fuse 7 When you achieve the proper sequence of switches in Steps 5 and 6 tighten the latch board screws at that point TEST THE MICROWAVE ENERGY LEAKAGE Make sure the microwave energy leakage is below the limit of 1mW cm with a 275 ml water load and 5mW cm with a 275 ml water load without the cabinet when measured with a survey meter 7 13 INTERLOCK CONTINUITY TEST A PRIMARY INTERLOCK SWIT
14. outside diameter of approximately 7 6 190mm 3 The oven and the empty vessel are at ambient temperature prior to the start of the test 4 The initial temperature T1 of the water is 10 2 509 It is measured immediately 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 the 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 1022 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 NOTES For simple test of microwave power output conduct it by heating one litter water for one minute minimum temperature rise should be 15 4 F 8 6 C NOTE WHEN MEASURING 1 Do not exceed meter full scale deflection 2 The test probe must be removed no faster than 1 inch sec 2 5cm 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 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 possib
15. the magnetron the blower motor or the circuit board NOTES If the fuse is blown by an improper switch operation replace all switches and the fuse at the same time After replacing the defective switches with new ones make sure that they are correctly connected Check for microwave energy leakage according to INTERLOCK ADJUSTMENT PROCEDURES on page 7 12 when the primary interlock secondary interlock switches and or the interlock monitor switches are adjusted or replaced 7 18 2 CHECKOUT PROCEDURES FOR RELAY PROBLEM A Vent fan motor and oven lamp turn on without touching START key when the door is closed 5 GOOD Remove the mate connector of I O CON from the circuit board Does the unit still operate je Replace the circuit board Defective RELAY7 Replace RELAY PROBLEM B Vent fan motor and oven lamp turn on When the door is closed and START key is touched pee pe 7 19 Measure the voltage at pin NO 4 5 6 of U01 Voltage reading 0 Vdc Defective k Replace the RELAY7 or poor connection of circuit board RELAY7 Replace RELAYT or correct the connection 3 CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board 1 1 The start function fails to operate but the high
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17. All service adjustments should be made for minimum microwave energy leakage readings Magnetron 4 Figure 13 7 8 E REMOVING DOOR Figure 14 1 Remove the vent grille by removing two screws securing it to the Outer Case loosening 2 Lift up and draw the door NOTES After replacing the door be sure to check that the primary interlock switch the secondary interlock switch and the interlock monitor switch is in good operating normally After replacing the door check for microwave energy leakage with a survey meter Microwave energy leakage must be below the limit of 5mW cm With a 275 ml water load Figure 14 F DISASSEMBLING DOOR Figure 15 1 Remove the dielectric choke by using knife blade or small screw driver etc 2 Remove two screws securing it to the door handle CAUTION Be careful not to damage door seal plate with the screwdriver Figure 15 G ASSEMBLING DOOR 1 When mounting the door assembly to the oven 3 Carefully pull the ventilation motor ASS Y out of assembly be sure to adjust the door assembly the microwave oven See Figure 18 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 Space A ie m Figure 18 H REMOVING THE VENTILATION FAN ASS Y 1
18. CH TEST When the door is opened slowly an audible click should be heard at the same time or successively at intervals and 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 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 closed 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
19. DISCHARGED THE CAPACITOR SHOULD BE DISCHARGED BY USING INSULATED WIRE I E TEST PROBE CONNECTED TO 10K OHM RESISTOR IN SERIES TO GROUND WHEN RECONNECTING THE WIRE LEADS TO ANY PART MAKE SURE THE WIRING CONNE CTIONS AND LEAD COLORS ARE CORRECTLY MATCHED ACCORDING TO THE OVERALL CIR CUIT DIAGRAM ESPECIALLY SWITCHES AND HIGH VOLTAGE CIRCUIT BEFORE A GRILLE HAVE TO REMOVE FIRST A REMOVING POWER AND CONTROL CIRCUIT BOARD Figures 1 2 and 3 1 Remove a screw securing the control panel assembly to the oven cavity 2 Remove the control panel with pushing it upward 3 Remove the connector CN1 and wire leads Relay from the circuit board Control Panel Power Transformer Relay 7 5s Relay 7 4 Remove 3 screws securing the circuit board e Figure 2 5 Remove the FPC connector from the terminal socket following HOW TO REMOVE THE FPC CONNECTOR on the next page 6 Remove the circuit board from the control bracket carefully Control Bracket FPC Connector S1 Circuit Board Figure 3 HOW TO REMOVE THE F P C CONNECTOR Follow the steps below as illustrated in Figures 4 and 5 to remove the F P C connector 1 Hold the edges of the plastic fastener with thumb and forefinger Figure 4 2 Lift up the lever of the plastic fastener from the terminal socket by lightly pressing the lever end with forefinger Figure 5
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22. ORDER NO MOD 0106244C1 E2 Service Manual Microwave Oven NN S251WL NN S251BL Specifications Power Source 120 V AC 60 Hz Power Requirement 13 5 Amps 1 550 W Output 1000 W Full Power IEC 60705 Microwave Frequency 2 450 MHz Timer 99 min 99 sec Outside Dimensions 2916 X 1671e H X 153 D 760mm W x 418mm H x 385mm D Oven Cavity Dimensions 1978 W x 8 5 X 143ne D 505mm W x 227mm H x 360mm D Weight Approx 52 lbs 23 5 kg Specifications subject to change without notice m 0 pP n n 2001 Matsushita Electric Industrial Co Ltd a a rights reserved Unauthorized copying and distribution is a violation of law SAFETY PRECAUTIONS 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 WARNING This product should be serviced only by trained qualified personnel Though this product has been manufactured in compliance with Federal Per
23. Remove the mounting plate by removing two screws securing it to the back plate See Figure 16 2 Remove the two screws securing the MOUNT and one screw securing the ventilation fan ASS Y See Figure 17 Figure 17 REMOVING THE TURNTABLE MOTOR NOTES 1 Remove the turntable Remove the leadwire from the turntable motor VERY 2 Remove the turntable shaft VERY CAREFULLY CAREFULLY with a slotted screwdriver Figure 19 Be sure to grasp the connector not the wires when 3 Remove the base plate by removing 6 screws removing securing it to the oven cavity Figure 20 4 Disconnect the leadwire from the turntable motor terminals 5 Remove the 2 screws securing the turntable motor to the oven cavity ASS Y Figure 21 N Figure 19 Base Plate Terminals els Turntable Motor Figure 21 7 11 INTERLOCK SYSTEM INTERLOCK SYSTEM 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 ADJUSTMENT PROCEDURES To avoid possible exposure to microwave energy leakage adjust the door latches and interlock switches using the following procedure The Interlock Monitor and Primary Interlock Switch act as the final safety switch protecting the user from microwave energy The terminals between
24. Secondary Winding binary Winding Figure 23 RESULTS MAGNETRON Wire leads are removed on high test scale 1 Measure the resistance Across the filament terminals of the magnetron with an ohm meter on Rx1 scale 2 Measure the resistance Between each filament terminal of the magnetron and the chassis ground with an ohm mater Normal reading Less than 1 ohm Normal reading Infinite ohms NOTE Replace the magnetron if the magnetron checks and all of the high voltage component tests are good but the unit still does not heat a load 1 Measure the resistance HIGH VOLTAGE TRANSFORMER Wire leads are removed a Primary winding b Filament winding c Secondary winding 2 Measure the resistance With an ohm meter on highest scale a Primary winding to ground b Filament winding to ground With an ohm meter on Rx1 scale Normal readings Approx 0 3 to 0 5 ohm Less than 0 1 ohm Approx 65 to 120 ohms Normal readings Infinite ohms Infinite ohms NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON COMPONENTS TEST PROCEDURES RESULTS HIGH VOLTAGE CAPACITOR Measure the resistance 1 Terminal to terminal Figure 24 a Normal reading Momentarily indicates several ohms and then gradually returns to infinite ohms Abnormal reading In
25. UITY 7 14 TEST AND CHECKOUT PROCEDURES AND TROUBLE 7 15 A TESI PROCEDU RE S un ete pe eei etel n deste 7 15 B CHECKOUT PROCEDURES sse nennen nren nter 7 18 TROUBLE SHOOTING acia Ee D PER Aa delata 7 21 SCHEMATIC DIAGRAM PGB 2 3 redeat deat A eeu gt d qua aso ge dua ele 8 1 PRINTED CIRCUIT BOARD 24 4 Rete te bee em Ra eee ce 8 2 Rated Power Consumption s eere t D Power Supply Rated Current Magnetron Cooling EM Door Sealing EP Safety Devices mm Magnetron 2 High Voltage Capacitor Lamp ee eet ette Cavity Lamp nece eto RR nee Tempered Safety Glass Tray s Overall Dimensions 2 2 22 224 4 222 22222 Oven Cavity Size Effective Capacity of Oven Cavity eese SPECIFICATIONS 1 550W maximum Microwave oven Cook top lamps Ventilation fan 2 450 MHz 50 MHz 120 60 Hz 13 5 Amp Microwave ovens Cook top lamps Ventilation fan Forced Air Cooling Rectification Voltage Double Half Wave Choke System Oven Cavity Thermostat Open at 90 5 C Fuse 20A Primary Interlock Switch Secondary Interlock Switch Interlock Monitor
26. a small amount of food be sure to put a glass of water into the cooking compartment The glass turntable may become hot after operating be careful when touching it B Aluminum foil should be avoided because it will disrupt cooking and may cause arcing However small pieces may be used to cover some parts of food to slow the cooking Any aluminum foil used should never be closer than 2 5 cm to any side wall of the oven TRIAL OPERATION After installation the following sequences and results should be checked carefully A Put a container filled with water about 1 liter into the oven and close the door tightly B Set cooking time for 10 minutes by touching 1 and then 0 three times 1 0 0 0 appears in the display window C Touch the START key Make sure the cavity light comes on The unit will begin cooking and the display window will show the time counting down by seconds D After about 5 minutes make sure the primary interlock switch the secondary interlock switch and the interlock monitor switch operate properly by opening and closing the door several times Touch the START key each time the door is closed E Continue operating the unit Four long beep sound signal is heard when the time is up The unit will shut off automatically F Confirm the water is hot G Finally measure the output power according to POWER OUTPUT MEASUREMENT on page 7 3 6 1 FEATURES AND SPECIFICATIONS FEATURES A The
27. apacitor by shorting across the two terminals the magnetron be assembled to the waveguide and with an insulated screwdriver cavity Never operate the magnetron unless it is properly installed Be sure that magnetron gasket is properly installed around the dome of the tube whenever installing the magnetron ANTENNA Gasket Chassis Ground COOLING FIN FILAMENT NOTE Touch chassis first then snort to the TERMINALS i rminals capacitor te als MAGNETRON CHASSIS GROUND MAGNETRON Remove your watches whenever working close to or replacing the Magnetron DO NOT touch any parts of the control panel circuit A resulting static electric discharge may damage this P C B THE OVEN IS TO BE SERVICED ONLY NEVER operate the oven with no load BY PROPERLY QUALIFIED SERVICE NEVER injure the door seal and front plate of the oven PERSONNEL cavity NEVER put iron tools on the magnetron NEVER put anything into the latch hole and the interlock Switches area INSTALLATIONS PRECAUTIONS ON INSTALLATION A Plug the power supply cord into a 120V AC 60Hz single phase power source with a capacity of 15A or 20A B Avoid placing the unit in a location where there is direct heat or splashing water C Install the unit on the mounting plate firmly D Place the unit as far away as possible from TV radio etc to prevent interference GROUNDING INSTRUCTIONS For personal safety this appliance m
28. dicates continuity or infinite ohms from the beginning 2 Terminal to case Figure 24 b Normal readings Infinite Abnormal reading Indicates continuity HIGH VOLTAGE DIODE Measure the continuity 1 Forward Figure 25 a Normal readings continuity Abnormal reading Infinite Note Meter reading depend on the battery in the Meter 1 Reverse Figure 25 b Normal readings Infinite Abnormal reading continuity 7 16 COMPONENTS TEST PROCEDURES RESULTS Measure the resistance between terminal When When not pins of connector KEY CONNECTOR Resistance touched ltouchaa NOTE value When reconnecting the FPC connector Less than More than make sure that the holes on the FPC 400 ohms 1 mega ohm connector are properly engaged with hooks on the plastic fastener FPC CONNECTOR MATRIX CIRCUIT FOR Top TOUCH KEY BOARD CONNECTOR KEY CON For detail matrix circuit of each model refer to page 5 2 1 2 3 4 5 6 7 TOUCH KEY miojo MC mcm 5 04 BOARD 8 4 4 4 4 4 4 4 LIGHT FUNCTION T REHEAT POTATO DEFROST 6 1 9 A I fis ff A clock QUCK everace TIMER 7 2 10 A A AA 4 A 47 N C N C PIZZA 8 3 11 A A AA A A A STOP TIMER CHICKEN N C START 9 4 RESET OFF PIECE 12 A A ALTA 4 A 47
29. formance Standard 21 CFR Subchapter J D H H S U S A models or Radiation Emitting Devices Act Health and Welfare Canada Canadian models itis very important all repairs should be made in accordance with procedures described in this manual to avoid being exposed to excessive microwave radiation Check for radiation leakage before and after every servicing according to the procedure for measuring radiation leakage If the unit cannot be repaired on site advise the customer not to use until unit is repaired Any serviceman who learns of any accident pertaining to microwave radiation leakage including the oven operating with open door should immediately notify the appropriate address listed below and Center for Devices and Radiological Health DHHS IN U S A Panasonic Services Company IN PUERTO RICO PSC PASC 50 Meadowland Parkway PSC San Gabriel Industrial Park Secaucus New Jersey 07094 65th Infantry Ave Km 9 5 Attention Technical Service Division Carolina Puerto Rico 00985 201 348 7000 787 750 4300 6 There are special components used in the microwave oven which are important for safety These parts are marked with a on the replacement parts list It is essential that these critical parts should be replaced only with the manufacture s specified parts to prevent microwave leakage shock fire or other hazards Do not modify the orginal design PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE
30. ly cause probe damage RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT 1 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 Should the microwave energy leakage not be more than 2 mW cm 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 3 S 9 The microwave power output P in watts is calculated from the following formula 4187 x AT bis T 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 oe E TURNTABLE DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES UNIT MUST BE DISCONNECTED FROM ELEC TRICAL OUTLET WHEN MAKING REPAIRS RE PLACEMENTS ADJUSTMENTS AND CONTIN UITY CHECKS WAIT AT LEAST ONE MINUTE UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY
31. magnetron oscillating measure the leakage by Check for radiation leakage after every servicing holding the probe perpendicular to the surface being Should the leakage be more than 2 mW cm inform measured PASC immediately After repairing or replacing any 1 Measurement with the outer panel removed Whenever you replace the magnetron measure for radiation leakage before the outer panel is radiation safety device keep a written record for future reference as required by D H H S regulation This requirement must be strictly observed In addition the leakage reading must be recorded on the service installed and after all necessary components are repair ticket while in the customer s home replaced or adjusted Special care should be taken in measuring around the magnetron NOTE The U S Government standard is 5mW cm while in the customer s home 2mW cm stated here is WARNING our own voluntary standard Avoid contacting any high voltage parts 1 Equipment 2 Measurements with a fully assembled oven Electromagnatic radiation monitor After all components including outer panel are e Glass thermometer 212 or 100 C fully assembled measure for radiation leakage 600cc glass beaker around the door periphery the door viewing window the exhaust opening and air inlet 2 Procedure for measuring radiation leakage openings Note before measuring Au 2 1 Do exceed meter full scale deflection Leakage 3 Record keeping
32. ock and indicators to tell you time of day cooking time settings and cooking functions selected Auto Defrost Pad Meat poultry fish Touch on pad to select food type and defrost food by weight Auto Reheat Pad Touch this pad to reheat dinner plate soup sause casserole roll muffin Auto Cook Pad Touch this pad to cook vegetables rice or casseroles Cook Time Pad Touch this pad to set a cooking time Power Level Pad Touch this pad to select a cooking power level Number Pads Touch number pads to enter cooking time power level quantities or weights Timer Pad Touch this pad to set the kitchen timer Clock Pad Touch this pad to enter the time of day 10 11 12 13 14 15 16 17 4 2 Timer Off Pad Touch this pad to stop timer function Function Pad Touch this pad to change the oven s default settings for sound clock display speed defrost weight and demo mode operations Quick Min Pad Touch this pad to set and start quickly at 100 power level Stop Reset Pad Touch this pad to stop oven or clear all entries Start Pad Touch this pad to start a function If you open the door after oven begins to cook retouch START Light On Night Off Pad Touch this pad to turn on the cooktop countertop light Fan High Low Off Pad Touch this pad to turn the fan on or off Menu Pads OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM Note 1 DOOR OPENED
33. r to assure correct results 22 C When measuring the leakage always use the 2 inch 5cm spacer supplied with the probe Probe scanning speed Less than 2 5 cm sec 1 in sec MEASUREMENT WITH THE OUTER CASE REMOVED 1 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 Around the magnetron The waveguide WARNING AVOID CONTACTING ANY HIGH VOLTAGE PARTS MEASUREMENT WITH A FULLY ASSEMBLED OVEN 1 After all components including the outer panels 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 T NOTES Leakage with the outer panels removed less than 5 mW cm 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 cme POWER OUTPUT MEASUREMENT 1 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 2 The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 1 8 3 mm and an
34. safety systems incorporated in this model are 1 Primary interlock switch 2 Secondary interlock switch 3 Interlock monitor switch 4 Choke system 5 Magnetron thermal fuse 6 Oven cavity thermostat Note This thermostat located on the oven cavity will open and stop the unit from operation only if a high temperature is reached such as a fire created by overcooking food Any one of 10 power output levels ranging 100W to 1000W can be selected by the touch control and electronic computer system SERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY A SINCE NEARLY 2 100 VOLTS EXISTS IN SOME CIRCUITS OF THIS UNIT REPAIRS SHOULD BE CARRIED OUT WITH GREAT CARE The filament leads of magnetron carry High Voltage with respect to ground Extreme caution must be exercised Never plug the unit into a power source to determine which component is defective in high voltage section B TO AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY LEAKAGE THE FOLLOWING PRECAUTIONS MUST BE TAKEN BEFORE SERVICING 1 Before the power is applied a Make sure the primary interlock switch the secondary interlock switch and the interlock monitor switch operate properly by opening and closing the door several by opening and closing the door several times Make sure the perforated screen and the dielectric choke of the door are correctly and firmly mounted 2 After power is applied a Make sure the interlock
35. securing it to the outer case and one screw securing it to the ventilation motor ASS Y and cavity Remove the power cord cover from outer case by removing a screw Power cord Mounting Plate Outer Case Base Plate C REMOVING THE DOOR INTERLOCK SWITCHES Figures 9 10 1 Disconnect the wire leads from the interlock switches 2 Remove two screws securing the Door Hook 3 Make necessary replacements and check microwave energy leakage according to ADJUSTMENT PROCEDURE on page 7 12 Door Hook Sar cee re ND Figure 9 a Figure 10 WIRE COLOR SYMBOL COLOR WH WHITE YL YELLOW RD RED GREEN Not Provided Door Hook Secondary Interlock Switch Interlock Monitor Switch Primary Interlock Switch D REMOVING MAGNETRON NOTES Figures 11 Through 13 When removing the magnetron make sure that its 1 Remove vent grille dome does not hit any adjacent parts or it may be 2 Remove mount damaged 3 Remove outer case 4 5 Disconnect the wireleads When replacing the magnetron be sure to install the Remove the Magnetron very carefully magnetron gasket in the correct position and be sure that the gasket is in good condition After replacing the magnetron check for microwave energy leakage with a survey meter Microwave energy leakage must be below the limit of 5 mW cm
36. switch mechanism is operating properly by opening and closing the door b Check microwave energy leakage must bebelow the limit of 5 mW cm All service adjustments should be made for minimum microwave energy leakage readings 3 Do not operate the unit until it is completely repaired if any of the following conditions exist The unit must not be operated a The door does not close firmly b The hinge is broken c The door seal is damaged d The door is bent or warped or there is any other visible damage on the unit that may cause microwave energy leakage NOTE Always keep the seal clean e Make sure that there are no defective parts in the interlock mechanism Make sure that there are no detective parts in the microwave generating and transmission assembly especially waveguide f The following items should be checked after the unit is repaired a The interlock monitor switch is connected correctly and firmly b The magnetron gasket is properly positioned and mounted c The waveguide and the oven cavity are intact no microwave energy leakage d The door can be properly closed and the safety switches work properly e The unit must stop when the door is opened or the time is up The unit must not be operated with any of the above components removed or by passed PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE D Tap the start pad or set the timer and with the WARNING x
37. ust be fully grounded at all times In the event of an electrical short circuit grounding reduces the risk of electrical shock The plug must be plugged into an outlet that is properly installed and grounded CAUTION This unit is equipped with a 3 prong plug for your safety If the wall outlet is a grounded 3 hole type the unit will be grounded automatically Plug with Ground Prong Properly Polarized and Grounded Outlet WARNING Improper use of the grounding plug can result in a risk of electric shock Do not under any circumstances cut or remove the third ground prong from the power cord plug 3 1 FEATURE DIAGRAM Identification Plate amp Menu Label See through Oven Window Glass Tray Oven Air Vent Door Handle Cover do not remove Door Safety J Lock System Control Panel Cooktop Light Grease Filter CONTROL PANEL Panasonic Auto Auto Auto Reheat Defrost Cook 4 Time Level Popcorn 1 2 3 Beverages x 4 5 6 Potatoes 47 7 8 9 Frozen Timer 0 Clock Entr es Timer Quick Chicken Off Function Min Pieces Stop Reset Start 4 44 C Light Fan nl 46 On Night Off High Low Off Display Window The Display includes a cl
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