Service Manual - Appliance Factory Parts
Contents
1. OWNERS service 702 D 704 gt tos MANUAL MANUAL MANUAL LABEL TEMPLATE lt 06 1 gt TEMPLATE lt 06 2 gt 8 8 P NO MFL305029012. FPC CONNECTOR Top COOK REHEAT pin ADD 30S SEAFOOD POURLTY 4 44 A BEEF option KITCHEN cLocK MORE LESS 4 EE A A A Figure 29 N C N C N C N C N C N C 4 A A A A A Figure 28 VH RA DEF COMPONENTS TEST PROCEDURES RESULTS RELAY8 1 2 Measure continuity ohm meter scale Rx1 Remove the lead wires and operate oven at power level 1 through power level 10 Figure 30 OPEN 4 6 sec 8 10 12 sec 14 sec 16 sec 18 o AON DO a I 20 sec k o 22 sec RELAY11 Measure continuity ohm meter scale Rx1 Remove the lead wires and operate oven Grill Cooking Grill Cooking Start HEATER ELEMENT Remove the wire leads Measure resistance ohm meter scale Rx1 Normal Approximately 15 to 25 ohms Abnormal Infinite or several VENTILATION MOTOR Remove the lead wires Measure resistance lt ohm meter scale Rx1 Normal Approximately 20 to 40 ohms Abnormal Infinite TURNTABLE MOTOR Remove the wire leads Measure resistance ohm meter scale Rx1000 Normal A
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4. MODEL 721 81622 SEARS 18182 DIVISION 22 BASIC FIELD MANUAL FOR MICROWAVE HOOD COMBINATION MODEL 721 81622600 721 81623600 721 81629600 April 2006 CAUTION SAFETY PRECAUTIONS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY Do not operate or allow the oven to be operated with the door open 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 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 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 A Microwave leakage check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the owner Proper operation of the microwave ovens requires that the magnetron be assembl
5. TEST AND CHECKOUT PRECEDURES AND TROUBLESHOOTING FILAMENT SECONDARY CAUTIONS WINDING WINDING 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 25 ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD 1 LITER OF WATER IN CONTAINER IN THE OVEN PRIMARY WINDING Figure 25 A TEST PROCEDURES COMPONENTS TEST PROCEDURES RESULTS 1 Measure the resistance Across the filament terminals of the magnetron with Normal reading an ohm meter on Rx1 scale Less than 1 ohm 2 Measure the resistance Between each Normal reading MAGNETRON filament terminal of the magnetron and Infinite ohms Wire leads are the chassis ground with an ohm meter removed on high test scale 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 Remove the wire leads 2 Measure resistance ohm meter scale Rx1 Normal readings a Primary winding Approx 0 3 to 0 5 ohm HIGH VOLTAGE b Secondary winding Approx 65 to 120 ohms TRANSFORMER c Filament winding Less than 0 1 ohm Wire leads are removed 3 Measure resistance ohm meter scale Rx1000 Normal readings a Primary windi
6. Figure 21 Wire Leads Turntable Motor Figure 22 INTERLOCK SYSTEM INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to stop the microwave activity when the door is opened during cooking and 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 COM and of the Interlock Monitor must close when the door is opened After adjusting the Interlock Monitor Switch make sure that it is correctly connected T Latch Board Y Secondary Interlock Switch Interlock Monitor Switch Primal Interlock Switch Figure 23 LATCH 0 1 64 Figure 24 LATCH BOARD 0 1 64 CHECK THE DOOR LATCH AND SWITCH CLOSING NOTE The outer cover of the microwave oven is removed 1 Setthe microwave oven on its side so that you can see the latch board and the switches as shown in Figure 23 2 Close the door tightly and check gaps A and B to be sure they are no more than 1 64 inch 0 5 mm See Figure 24 for close up view of gaps A and B door latches If all gaps are less than 1 64 inch 0 5 adjustment of the latch bo
7. The meter should indicate a open circuit in the door open position When the door is closed the 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 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 open Primary Switch peus Monitor Switch Secondary Switch NOTE After checking for the continuity of switches make sure that they are connected correctly 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 V16 FA 63 OR VP 533A OF OR V 5230Q FOR SECONDARY SWITCH
8. 4 2 Lift up the lever of the plastic fastener from the terminal socket by lightly pressing the lever end with forefinger Figure 5 3 Remove the F P C connector from the terminal socket Plastic fastener F P C Connector Terminal socket Figure 4 Plastic fastener Connector Terminal socket Figure 5 HOW TO 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 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 3 Lock the plastic fastener into the hook of the terminal socket securely Figure 7 Plastic fastener Connector Terminal socket Figure 6 Plastic fastener Connector Terminal socket Figure 7 REMOVING THE OUTER CASE Figure 8 1 Remove the vent grille by removing the two screws securing it to the outer case 2 Remove the two screws securing it to the front bracket 3 Remove the two screws securing it to the air duct 4 Remove the mounting plate by turning the two Screws securing it to the outer case b Remove the base plate by removing the four screws securing it to the outer case Remo
9. 6 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 INTERLOCK CONTINUITY TEST A PRIMARY INTERLOCK SWITCH TEST When the door is opened slowly an audible click should be heard at the same time or successively at intervals 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
10. AND SPECIFICATIONS FEATURES 6 1 SERVICE INFORMATION E 7 1 PRECAUTIONS AND REPAIR SERVICE mmm 7 1 MICROWAVE LEAKAGE TEST mene nennen sense 7 2 POWER OUTPUT MEASUREMENT nennen enne 7 3 DISASSEMBLY nenenne eene 7 4 INTERLOCK SYSTEM 7 12 INTERLOCK CONTINUITY TEST 7 14 TEST AND CHECKOUT PROCEDURES AND TROUBLE SHOOTING 7 15 A TEST PROCEDURES eene nennen nnne eene enne nenne nnne nnne 7 15 B CHECKOUT PROCEDURES Henne eene eene eene 7 18 C TROUBLE SHOOTING mHmenen eene nennen nennen nnne enne 7 21 EXPLODED VIEW rennen 8 1 PART REFERENCE LIST 9 1 SPECIFICATIONS Rated Power Consumption Microwave Output Frequency Power Supply Rated Current Magnetron Cooling Rectification Door Sealing Safety Devices Magnetron High Voltage Capacitor High Voltage Diode Cook top Lamp Cavity Lamp Timer Tray Overall Dimensions Oven Cavity Size Effective Capacity of Oven Cavity Accessories 1650W maximum Microwave oven Cook top lamps Ventilation fan 1000W IEC60705 Adjustable 100W through 1000W 10 steps 2450 MHz 50 MHz 120 VAC 60 Hz 14Amp Microwave oven Cook top lamp Ventilation fan Forced Air Cooling Rectification Voltage Double Half Wave Choke System Oven TCO Open at 90 C 5 Grill Heater Open at 145 C 5 C Fuse 20A Primary Interlock Switch Seco
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12. HE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY 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 CONN ECTIONS AND LEAD COLORS ARE CORRECTLY MATCHED ACCORDING TO THE OVERALL CIR CUIT DIAGRAM SPECIFICALLY SWITCHES AND HIGH VOLTAGE CIRCUIT A REMOVING POWER AND CONTROL CIRCUIT BOARD Figures 1 2 and 3 1 Remove the screw securing the control panel assembly to the oven cavity 2 Remove the control panel by pushing it upward 3 Remove the connectors CN1 CN5 wire leads RY8 RY11 and sensor wire connector from the circuit board Control Panel u zei 8 Figure 1 7 4 4 Remove the three screws the circuit board Ro Circuit Board Figure 2 b 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 HOW 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
13. The service technician should instruct the owner not to use the unit until the oven has been brought into compliance If the oven operates with the door open the service technician should Tell the user not to operate the oven The service technician 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 technician from radiation leakage EQUIPMENT TESTER VOLTS DC AC Ohmmeter Microwave survey meter Holaday 1500 HI 1501 Narda 8100 8200 600 cc non conductive material beaker glass or plastic inside diameter approx 3 inch 8 5 cm Glass thermometer 100 or 212 F 1 deg scale MEASURING MICROWAVE ENERGY LEAKAGE Pour 275 15cc of 20 5 C 68 9 F water in a beaker which is graduated to 600 cc and place the beaker on the center of the turntable Set the energy leakage monitor to 2 450 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 microwave radiation using and electromagnetic radiation monitor by holding the probe perpendicular to the surface bein
14. ard may not be necessary Go to Steps 5 and 6 to check the sequence of the switches NOTE The 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 inch 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 8 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 less than 1 64 inch 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 and watch the door 7 When you achieve the proper sequence of latch secondary switch release rod and lever on switches in Steps 5 and 6 tighten the latch board the switches so they activate in the following screws at that point sequence TEST THE MICROWAVE ENERGY LEAKAGE Primary Interlock Switch Secondary Interlock Switch Interlock Monitor Switch 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 Adjust the latch board until the switches operate in cabinet when measured with a survey meter this sequence See Steps 3 and 4
15. d therefore a voltage reading of approximately 4 7 VDC to 6 4 VDC will be read depending on meter battery strength etc Note If the meter leads were reversed negative voltage of the same amount would be seen Normal Approximately 4 7 6 4V COMPONENTS TEST PROCEDURES RESULTS STEP 3 Test the diode for reverse biasing Procedure Normal 1 Using the same scale on the meter connect Approximately OV the positive side of the battery to the anode of the diode as illustrated in Figure 27 3 2 The diode should be reverse biased therefore a reading of 0 volt or a value displayed in mV will be seen The display will be erratic changing values rapidly in the mV scale 40 00 Cx mA com Figure 27 1 Figure 27 2 Figure 27 3 Measure the resistance between terminal When When not EE connector KEY CONNECTOR Resistance touched touched When reconnecting the FPC connector value 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 MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR KEY CON For detail matrix circuit of each model TOUCH KEY refer to page 5 2 BOARD 2E 1sE 44E d5E dseF d7 1 2 8 4 5 6 7 A AZ uw A 8 9 0 MICRO POWER EXPRESS DEF L A A A A A VENT VENT STOP ON OFF 5 SPEED CLEAR START A 42 A A A 44 A
16. ed to the wave guide 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 Routine service safety procedures should be exercised at all times Untrained technicians should not attempt service without a thorough review of the test procedures and safety information contained in this manual 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 MODEL 721 81622 721 81623 721 81629 TABLE OF CONTENTS Page SAFETY PRECAUTIONS nennen nennen nnne nenne Inside front page SPECIFICATIONS n 1 1 CAUTIONS 2 1 INSTALLATIONS 3 1 OPERATING INSTRUCTIONS 4 1 CONTROL PANEL M 4 1 CONTROL PANEL INSTRUCTIONS renes 4 2 OVERALL CIRCUIT DIAGRAM nnne enean nennen nennen nas sehen eene eene 5 1 SCHEMATIC DIAGRAM nennen nennen nennen nennen sent 5 1 MATRIX CIRCUIT FOR TOUCH KEY BOARD nennen eene ennemis 5 2 GENERAL INFORMATION FOR SERVICE nennen eene 6 1 GENERAL PRECAUTIONS IN USE enne ennn nennen 6 1 TRIAL OPERATION enne nane 6 1 FEATURES
17. en and the empty vessel are at ambient Temperature TO prior to the start of the test 4 The initial temperature T1 of the water is 10 1 C 50 F 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 b The time T for the temperature of the water to rise by a value AT of 10 1 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 6 The microwave power output P in watts is calculated from the following formula 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 8 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 4 When testing near a corner of the door keep the probe perpendicular to the surface making sure the probe is moved horizontally along the oven surface RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT 1 After adjustment and repair of any microwave energy interruption or microwave energy block
18. g measured Move probe along shaded area Probe scanning speed Less than 1 inch sec 2 5 cm 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 2 Microwave energy leakage must not exceed the values described below 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 cm 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 1000 5 g of potable water 2 The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 1 8 inch 3 mm and an outside diameter of approximately 7 6 inch 190mm 3 The ov
19. ing device record the measured values for future reference Also enter the information on the service invoice 2 The microwave energy leakage should not be more than 2 mW cn after determining that all parts are in good condition functioning properly and genuine replacement parts which are listed in this manual have been used 3 At least once a year have the electromagnetic energy leakage monitor checked for calibration by its manufacturer 4187 Mw T2 T1 0 55Mc T2 TO T is measured while the microwave generator is operating at full power Magnetron filament heat up time is not included about 3 sec 7 The water is stirred to equalize temperature throughout the vessel prior to measuring the final water temperature 8 Stirring devices and measuring instruments are selected in order to minimize addition or removal of heat Where P is the microwave power output in watts Mw is the mass of the water in grams Mc is the mass of the container in grams TO is the ambient temperature in C is the initial temperature of the water in T2 is the final temperature of the water in jC 15 the heating time in seconds excluding the magnetron filament heat up time TURNTABLE DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES UNIT MUST BE DISCONNECTED FROM THE ELECTRICAL OUTLET WHEN MAKING REPAIRS RE PLACEMENTS ADJUSTMENTS AND CONTIN UITY CHECKS WAIT AT LEAST ONE MINUTE UNTIL T
20. is pad to turn the fan on or off Fan amp 5 Speed Touch this pad to choose one of 5 fan speeds High Night Off Sw Touch this pad to turn the light on high night or off OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM 120 VAC 60Hz SINGLE PHASE ONLY GND Note FUSE 20A 1 DOOR OPENED amp COOK OFF MODE NOISE FILTER ASM WH BK So MICRO COMPUTER BOARD GND VENT MOTOR OVEN m 9 Q a any 3 1 q p 9010 C gt tH T ale B RD OVEN LAMP BK BL LV 1 1213141516 A TRANSFORMER 112151415161 Y E oL BK RD RD H BL BR CONDENSER RY4 H El VM Pel ly COOKTOP H ler LAMP PK GRILL HEATER 7 THERMOSTAT 14510 C Aller BL YL C TURNTABLE MOTOR n M B A Ay GRILL GRILL HEATER RY YL YL O O BK YL RD ABSOLUTE NC oF a MONITOR YL HUMIDITY SWITCH 8 MIDDLE T H V TRANSFORMER RECTIFIER PRIMARY GND SWITCH H V CAPACITOR BOTTOM MAGNETRON OPTIONAL FUNCTION CONTROL MODULE WIRE COLORS FOR SENSOR MODEL ONLY SYMBOL COLOR BK BL BR GY GN YL WHITE RD BK EU 2345678 123 RED 32 1 YELLOW PINK BLUE 8 PIN CONNECTOR CN1 3PIN CN4 BROWN CONNECTOR CN5 CONNECTOR GN GREEN FOR SENSOR GY GREY Displa
21. ndary Interlock Switch Interlock Monitor Switch 2M289 M47J1 Capacitor 1 04F 2 1 KV AC Diode 350mA 9 0 KV 125 V 30 W or 40 W Digital up to 99 mim 99 sec in each cooking stage Tempered Safety Glass 29756 1 6716 1 555 0 209 2 W x9 s 14 D 1 6 Owner s Manual amp Cooking Guide Installation Manual Exhaust Adapter Exhaust Damper Mounting Kit and Two Filters Rotating Ring Assembly Shelf Tray 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 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 NEVER operate the oven with no load NEVER damage the door seal and front plate of the oven cavity NEVER put iron tools on the magnet
22. nergy 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 19 2 PROCEDURES FOR RELAY PROBLEM Oven lamp turn on without touching START key when the door is closed 5 Remove the mate connector of I O D Quo CON from the circuit board Does the unit still operate IS Replace the circuit board Defective RELAY1 Replace RELAY1 PROBLEM B Oven lamp turn on when the door is closed and START key is touched GOOD 7 20 Measure the voltage at pin NO 35 of 001 Voltage reading 5 Vdc jp Defective Replace the RELAY1 or poor circuit board connection of RELAY1 Replace RELAY1 or correct the connection 3 CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board 1 The start function fails to operate but the high voltage Systems the interlock switches the door sensing and the relay check good The unit with a normal relay continuously operates 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 sho
23. ng to ground Infinite b Filament winding to ground Infinite NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON 7 15 COMPONENTS TEST PROCEDURES RESULTS H V CAPACITOR gt DE SY 1 Check DC 9V battery before performing tests 2 Select the DCV scale on the meter 3 Using the meter battery and jump wire connect the items as illustrated in figures Terminal to terminal Figure 26 Terminal to case Figure 26 Normal Approximately 9V Abnormal Approximately OV Normal Approximately OV or a value displayed in mV will be seen H V DIODE RECTIFIER STEP 1 Test the diode to see if it is shorted Procedure 1 Select the ohm scale on the meter 2 Place the meter leads across the diode as pictured in Figure 27 1 The reading should be 40M ohm OL or a reading of infinity 3 Reverse the meter leads The reading should again indicate a reading of infinity If the diode shows infinity in BOTH directions it is NOT shorted 4 If the diode is not shorted proceed to step 2 STEP 2 Test the diode for forward biasing Procedure 1 Select the DCV scale on the meter 2 Using the meter battery and jumper wire connect the items as illustrated in Figure 27 2 This has the positive side of the battery connected to the cathode of the diode The diode should be forward biase
24. oking functions selected 2 MICRO The feature will allow you to cook food with microwave function 3 GRILL This feature will allow you to brown and crisp food quickly 4 COMBI This feature will allow you to cook food with the microwave and the grill function at the same time 5 Beef or Pork Touch this pad to allow you cook hamburger patties beef steaks and pork chops easily with grill fuction 6 Seafood Touch this pad to allow you cook shrimp fish fillet lobster tails easily with grill fuction 7 Poultry Touch this pad to allow you cook chicken pieces chicken breasts and chicken nuggets easily with grill fuction 8 Sensor popcorn Touch this pad to pop popcorn with the sensor feature The oven s sensor will tell the oven how long to cook depending on the amount of humidity it detects from the popcorn 9 Sensor Cook Touch this pad to cook baked patato frozen vegetable fresh vegetable canned vegetable frozen entree and rice The oven s sensor will tell the oven how long to cook depending on the amount of humidity coming from the food 10 Sensor Reheat Touch this pad to reheat casserole dinner plate pizza slice and soup sauce The oven s sensor will tell the oven how long to cook depending on the amount of humidity coming from the food 11 Soften Touch this pad to soften Butter Ice Cream Cream Cheese or Frozen Juice 12 Melt Touch this pad to melt Butter or Margarine Chocolate Cheese o
25. overcooking food B 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 APPROXIMATELY 2100 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 b 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 switch mechanism is operating properly by opening and closing the door b Check microwave energy leakage It must be below the limit of 5 mW cm All service adjustments should be made for minimum microwave energy leakage readings 7 1 3 Do not operate the unit until it is completely repaired if any of the following conditions exist The uni
26. pproximately 2 5 to 3 5 Kohms Abnormal Infinite or several ABSOLUTE HUMIDITY SENSOR FOR SENSOR MODEL Disconnect sensor connector from micom computer board Measure resistance terminal to terminal ohm meter scale Rx1000 Normal Approximately BK RD 6 0 Kohms RD WH 3 0 Kohms BK WH 3 0 Kohms Abnormal Infinite or approx 0 ohm NOTES A MICROWAVE ENERGY TEST 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 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 interlock switches and or the interlock monitor switch the door is opened 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 the magnetron the blower motor or the circuit board NOTES f the fuse is blown 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 e
27. prevent interference GROUNDING INSTRUCTIONS For personal safety this appliance must 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 OPERATING INSTRUCTIONS CONTROL PANEL O 3 2 Micro Grill Combi 4 6 AUTO GRILL Seafood Poultry p _ O SMART TOUCH SENSOR Cook Reheat aD Soften Melt 2 1 2 3 43 E 11 4 5 6 Defrose 7 8 9 Defrost 49 im a 8 3 Power More 6 a e STARTA STOP Less Enter Clear 02 a 93 1 Clock Option 25 9 3 amp 5 D On Off 5 Speed High Night off 4 1 CONTROL PANEL INSTRUCTIONS 1 Display The display includes a clock and indicators to tell you time of day cooking time settings cook powers quantities weights and co
28. r handle CAUTION Be careful not to damage door seal plate with the screwdriver Door Screen Figure 16 ASSEMBLING DOOR 1 When mounting the door assembly to the oven assembly be sure to adjust the door assembly parallel to the chassis Also adjust the door so there is 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 M re t REMOVING THE VENTILATION FAN ASSEMBLY 1 Remove the mounting plate by removing the two screws securing it to the back plate See Figure 17 2 Remove the two screws securing the MOUNT ALL and one screw securing the ventilation fan assembly See Figure 18 Figure 18 3 Carefully pull the ventilation motor assembly out of the microwave oven See Figure 19 Figure 19 J REMOVING THE TURNTABLE MOTOR 1 Remove the turntable 2 Remove the turntable shaft VERY CAREFULLY with a slotted screwdriver Figure 20 3 Remove the base plate by removing eight screws securing it to the oven cavity Figure 21 4 Disconnect the leadwire from the turntable motor terminals 5 Remove the two screws securing the turntable motor to the oven cavity assembly Figure 22 NOTES Remove the leadwire from the turntable motor VERY CAREFULLY Be sure to grasp the connector not the wires when removing Figure 20
29. r Marshmallow 13 Auto Defrost Touch this pad followed by Number Pads to thaw frozen meat by weight 4 2 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Express Defrost Touch this pad to express defrost GROUND BEEF 1 0 LBS TOUCH START will appear in the display Time Defrost Touch this pad followed by Number Pads to thaw frozen meat by weight More Touch this pad to add 10 seconds of cook time each time you press it Less Touch this pad to subtract 10 seconds of cook time each time you press it Power Touch this pad after the cook time has been set to set the amount of microwave energy released to cook the food The higher the number the higher the microwave power or cooking speed ADD 30 SEC Touch this pad to set and start quickly at 10096 power level Number Pads Touch number pads to enter cooking time power level quantities or weights Start Enter Touch this pad to start a function or enter all entries If you open the door after the oven begins to cook touch Start Enter again Stop Clear Touch this pad to erase an incorrect command cancel a program during cooking or to clear the Display Clock Touch this pad to enter the correct time of day Kitchen Timer Touch this pad to set the kitchen timer Option Touch this pad to change the oven default setting for sound clock display speed and defrost weights Fan amp On Off Touch th
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31. ron NEVER put anything into the latch hole and the interlock switches area MICROWAVE RADIATION Technicians 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 output 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 TECHNICIANS INSTALLATIONS BEFORE YOU BEGIN READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY PRECAUTIONS ON INSTALLATION A Plug the power supply cord into a 120V 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 telephone etc to
32. ron check for microwave energy leakage with a survey meter The microwave energy leakage must be below the limit of 5 mW cm All service adjustments should be made for minimum microwave energy leakage readings Outcase Figure 12 Magnetron Figure 13 REMOVING GRILL HEATER Figure 14 1 Remove the outer case 2 Remove the air duct by removing six screws securing it to the oven front plate guide air and glasswool L cover 3 Disconnect the wire leads of air duct 4 Remove the upper insulator by removing one Screw b Remove the four screws securing the heater terminal and two net screws securing the heater barrier 6 Remove the heater holding bracket and remove the grill heater from the cavity Figure 14 F REMOVING DOOR Figure 15 1 Remove the vent grille by removing the two screws securing it to the outer case 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 operate normally After replacing the door check for microwave energy leakage with a survey meter Microwave energy leakage must be below the limit of 5mW crr With a 275 ml water load Figure 15 G DISASSEMBLING DOOR Figure 16 1 Remove the dielectric choke by using knife blade or small screw driver etc 2 Remove the two screws securing it to the doo
33. t 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 f Make sure there are no defective parts in the microwave generating and transmission assembly specifically the waveguide 4 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 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 technician 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
34. to any side wall of the oven TRIAL OPERATION After installation the following sequences and results should be checked carefully A B Put a container filled with water about 1 liter into the oven and close the door tightly Set cooking time for 10 minutes by touching 1 and then 0 three times 1 0 0 0 appears in the display window 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 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 Continue operating the unit Two short and a long beep sound signal is heard when the time is up The unit will shut off automatically Confirm the water is hot Finally measure the output power according to POWER OUTPUT MEASUREMENT on page 7 3 6 1 FEATURES AND SPECIFICATIONS FEATURES A The safety systems incorporated in this model are 1 Primary interlock switch 2 Secondary interlock switch 3 Interlock monitor switch 4 Choke system 5 Magnetron thermostat 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
35. uld not 2 3 4 5 Wrong figures appear The figures of all digits Some of the indicators do no flicker light up 6 7 8 9 The clock does not keep time properly NOTE A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON 7 21 yono jeuJON joejuoo joejuoo 1991002 1004 yo TBWION 11009 eoe deu LS jo joejuoo yooYyD joeuooul eoueijsisaH eoueisisoJ WON 71 2 pue p 4 ass 716 Jaye JO eoueisiseJ SINSEIA 12902 JO pue sjequinu 1284100 Moys jou seop W31GOHd eouelsiseJ 094409 9911020 81 Z uo DNIMOT8 ISNA HOS SIUNAFIOHA 100903HO 88S ISNA 2 20 pue SANSEIN 1 15 ALIAVO E AlddNS H3MOd L SI p109 jddns ueym ejdsip ur
36. ve the Mount All from the outer case by removing the two screws securing it to the outer case 6 Remove the four screws from the rear section 7 Remove the outer case by pushing it back Vent Grille 7 Mount All Mounting Out Case Controller Figure 8 REMOVING THE DOOR INTERLOCK SWITCHES Figures 9 10 1 Disconnect the wire leads from the interlock switches 2 Remove the two screws securing the Latch Board 3 Make necessary replacements and check microwave energy leakage according to ADJUSTMENT PROCEDURE on page 7 12 Latch Board Secondary Latch Board Interlock Switch Interlock Monitor Switch Primary Interlock Switch Figure 10 Figure 9 WIRE COLOR SYMBOL COLOR WH WHITE BK BLACK BR RD YL PK BL GY GN GREEN N P Not Provided 7 7 D REMOVING MAGNETRON Figures 11 Through 13 1 Remove the vent grille 2 Remove the mount all 3 Remove the outer case 4 Disconnect the wireleads b Remove the three screws and Magnetron very carefully T Mount All Figure 11 NOTES When removing the magnetron make sure that its dome does not hit any adjacent parts or damage may occur 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 After replacing the magnet
37. y Likely Failure Condition Recommended Repair Procedure F 4 Humidity Sensor Connect a new sensor to the board If no failure For sensor model Failure code appears when starting sensor function replace control system assembly MATRIX CIRCUIT FOR TOUCH KEY BOARD KEY MATRIX J 2 3 4 5 6 1 2 3 4 5 6 T Se E A A 8 9 0 MICRO POWER GRILL A A A 2 2 LIGHT STOP ENTER SOFTEN MELT ON OFF 5 SPEED CLEAR START 4 COOK REHEAT ADD 308 SEAFOOD POURLTY et uA PEA COMBI KITCHEN CLOCK MORE LESS TIMER EP A A en N C N C N C N C N C N C 13 a L A A A A JA 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 a small amount of food be sure to put a glass of water into the cooking cavity The glass turntable may become hot after operating be careful when touching it 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 1 inch 2 5 cm
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