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Troubleshooting and Testing

3-4

Procedure

Letter

B

C

Component Test

POWER TRANSFORMER TEST

1.   Disconnect the power supply cord, and then remove outer case.
2.   Open the door and block it open.
3.   Discharge high voltage capacitor. (See Warnings and Instructions on page 3-1)
4.   Disconnect the primary input terminals and measure the resistance of the transformer with an

ohmmeter. Check for continuity of coils with an ohmmeter. On the R x 1 scale, the resistance

of the primary coil should be less than 1 ohm and the resistance of the high voltage coil should

be approximately 90 ohms; the resistance of the filament coil should be less than 1 ohm.

5.   Reconnect all leads removed from components during testing.
6.   Reinstall the outer case (cabinet).
7.   Reconnect the power supply cord after the outer case is installed.
8.   Run the oven and check all functions.

HIGH VOLTAGE RECTIFIER TEST

1.   Disconnect the power supply cord, and then remove outer case.
2.   Open the door and block it open.
3.   Discharge high voltage capacitor. (See Warnings and Instructions on page 3-1)
4.   Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the

resistance across the terminals and observe, reverse the leads to the rectifier terminals and
observe meter reading. If a short is indicated in both directions, or if an infinite resistance is

read in both directions, the rectifier is probably defective and should be replaced.

5.   Reconnect all leads removed from components during testing.
6.   Reinstall the outer case (cabinet).
7.   Reconnect the power supply cord after the outer case is installed.
8.   Run the oven and check all functions.

NOTE:

Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts.

DO NOT TOUCH THE COMPONENTS OF THE POWER TRANSFORMER WHILE POWER
TRANSFORMER IS ENERGIZED. IT IS DANGEROUS BECAUSE THIS HAS HIGH VOLTAGE
COMPONENTS. (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO
DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.)

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Summary of Contents for EI27MO45GSA

Page 1: ...Publication 5995534665 P N 316439275 April 2009 GRAIN DIRECTION ALL PARTS Technical Service Manual Microwave Oven Models EI27MO45GSA EI30MO45GSA ...

Page 2: ......

Page 3: ...ation of any safety device 5 Use ONLY REPLACEMENT PARTS CATALOGED FOR THIS APPLIANCE Substitutions may defeat compliance with Safety Standards Set For Home Appliances 6 GROUNDING The standard color coding for safety ground wires is GREEN or GREEN with YELLOW STRIPES Ground leads are not to be used as current carrying conductors It is EXTREMELY important that the service technician reestablish all ...

Page 4: ...d Door Switch Door Sensing Switch 2 4 Monitor Switch 2 5 Cooling Fan Motor 2 5 Turntable Motor 2 5 Monitor Fuse 2 5 Cavity Temperature Fuse 2 5 C T Temperature Fuse 2 5 Humidity Sensor Circuit 2 6 Section 3 Troubleshooting and Testing Warnings and Cautions 3 1 Troubleshooting Guide Chart 3 2 Test Procedures 3 3 Circuit Testing Charts 3 12 Section 4 Component Teardown Warnings and Cautions 4 1 Oute...

Page 5: ...NO OTHER VISIBLE DAMAGE WITH THE OVEN SERVICING AND REPAIR WORK MUST BE CARRIED OUT ONLY BY TRAINED SERVICE PERSONNEL CERTAIN INITIAL PARTS ARE INTENTIONALLY NOT GROUNDED AND PRESENT A RISK OF ELECTRICAL SHOCK ONLY DURING SERVICING SERVICE PERSONNEL DO NOT CONTACT THE FOLLOWING PARTS WHILE THE APPLIANCE IS ENERGIZED INVERTER UNIT THAT INCLUDES HIGH VOLTAGE CAPACITOR HIGH VOLTAGE POWER TRANSFORMER ...

Page 6: ...ion check as per the Microwave Measurement Procedure outlined in this service manual If microwave emissions level is in excess of the specified limit contact ELECTROLUX HOME PRODUCTS INC immediately If the unit operates with the door open service person should 1 Tell the user not to operate the oven 2 Contact Electrolux HOME PRODUCTS INC and Food and Drug Administration s Center for Devices and Ra...

Page 7: ...r case is installed 4 Run the oven and check all functions Microwave ovens should not be run empty To test for the presence of microwave energy within a cavity place a cup of cold water on the oven turntable close the door and set the power to HIGH and then set the microwave timer for two 2 minutes When the two minutes has elapsed timer at zero carefully check that the water is now hot If the wate...

Page 8: ...e water container shall be a low form of 600 ml 20 oz beaker with an inside diameter of approx 8 5 cm 3 1 2 in and made of an electrically nonconductive material such as glass or plastic The placing of this standard load in the oven is important not only to protect the oven but also to insure that any leakage is measured accurately 4 Set the cooking control on Full Power Cooking Mode 5 Close the d...

Page 9: ...ately 4 Set the cooking control on Full Power Cooking Mode 5 Close the door and select a cook cycle of several minutes If the water begins to boil before the survey is completed replace it with 275 ml of cool water C Leakage test with enclosure installed 1 Grasp probe of survey instrument and hold it perpendicular to gap between door and the body of the oven 2 Move the probe slowly not faster than...

Page 10: ...onds Microwave Power for Variable Cooking Repetition Rate P HI Full power throughout the cooking time P 90 approx 90 of Full Power P 80 approx 80 of Full Power P 70 approx 70 of Full Power P 60 approx 60 of Full Power P 50 approx 50 of Full Power P 40 approx 40 of Full Power P 30 approx 30 of Full Power P 20 approx 20 of Full Power P 10 approx 10 of Full Power P 0 No power throughout the cooking t...

Page 11: ...edicated line using a grounded receptacle When installing this appliance observe all applicable codes and ordinances A short power supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord Where a two pronged wall receptacle is encountered it is the personal responsibility and obligation of the customer to contact a qualified electrician and have it replaced w...

Page 12: ...is operating or door is opened 6 Oven door with see through window 7 Ventilation openings Rear 8 Auto Touch control panel 9 Time display Digital display 99 minutes 99 seconds 10 Wave guide cover 11 Power supply cord Oven Diagram Some one touch cooking features uch as add 30 sec are disabled after three minutes when the oven is not in use These features are automatically enabled when the door is op...

Page 13: ...avity where the food is placed to be cooked 5 Upon completion of the cooking time the power transformer oven lamp etc are turned off and the generation of microwave energy is stopped The oven will revert to the OFF condition 6 When the door is opened during a cook cycle the monitor switch door sensing switch third door switch primary switch relay RY1 and secondary interlock relay are activated wit...

Page 14: ...GRY GRY GRY WHT WHT WHT WHT WHT WHT WHT ORG ORG BRN BRN RED YLW BLK FILTER SCHEMATIC NOTE Condition Of Oven 1 Door Closed 2 Cooking Time Programmed 3 Variable Cooking Control High 4 Start Pad Touched B1 F1 F2 F3 TTM FM OL B2 L 120 VAC 60Hz H GRN GND GND N BLK RED RED CAVITY TEMP FUSE C T FUSE BLK BLU COM COM COM N O N O N O RY1 OVEN LAMP RELAY CONTROL UNIT SECONDARY INTERLOCK RELAY RY2 NOISE FILTE...

Page 15: ...ry cooking is determined by experiment with each food category and inputted into the LSI An example of how the sensor works BAKED POTATOES 1 Potatoes at room temperature Vapor is emitted very slowly 2 Heat Potatoes Moisture and humidity is emitted rapidly You can smell the aroma as it cooks 3 Sensor detects moisture and humidity and calculates cooking time and variable power COOKING SEQUENCE 1 Tou...

Page 16: ... completion sound 6 Synchronizing Signal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit It accompanies a very small error because it works on commercial frequency 7 Door Sensing Switch A switch to tell the LSI if the door is open or closed 8 Absolute Humidity Sensor Circuit This circuit detects moisture of the cooking food ...

Page 17: ...are replaced as an assembly TURNTABLE MOTOR The turntable motor rotates the turntable located on the bottom of the oven cavity so that foods on the turntable cook evenly during cooking The turntable may turn in either direction MONITOR FUSE 1 The monitor fuse blows when the contacts COM NO of the primary switch remain closed with the oven door open and when the monitor switch closes 2 If the wire ...

Page 18: ...tor circuit is used to detect the output voltage of the absolute humidity circuit to allow the LSI to control sensor cooking of the unit When the unit is set in the sensor cooking mode 16 seconds clearing cycle occurs first then the detector circuit starts to function and the LSI observes the initial voltage available at its AN6 terminal With this voltage given the switches SW1 to SW5 in the LSI a...

Page 19: ...t open 3 To discharge high voltage capacitor wait for 60 seconds and then short circuit the connection of the high voltage capacitor that is the connecting lead of the high voltage rectifier against the chassis with the use of an insulated screwdriver 4 Reconnect the leads to the primary of the power transformer 5 Reinstall the outer case cabinet 6 Reconnect the power supply cord after the outer c...

Page 20: ...ven heating is produced in oven load food Oven does not cook properly when programmedforCookingPowerP 50 mode OperatesproperlyonCooking P HI HIGH mode Oven goes into COMPU DEFROST but food is not defrosted well AH sensor does not end during sensor cooking condition Oven does not shut off after a cup of water is boiling by sensor cooking Oven stops at 16 sec after starting OFF CONDITION PROBLEM CON...

Page 21: ... procedure must be followed carefully 1 Fill the measuring cup with 16 oz 453 cc of tap water and measure the temperature of the water with a thermometer or thermocouple temperature tester Stir the thermometer or thermo couple through the water until the temperature stabilizes Record the temperature of the water 2 Place the cup of water in the oven Operate oven at POWER 10 HIGH selecting more than...

Page 22: ...e power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor See Warnings and Instructions on page 3 1 4 Isolate the rectifier from the circuit Using the highest ohm scale of the meter read the resistance across the terminals and observe reverse the leads to the rectifier terminals and observe meter reading If a short is indicated in both dire...

Page 23: ...tage capacitor See Warnings and Instructions on page 3 1 4 A continuity check across the cavity temperature fuse terminals should indicate a closed circuit unless the temperature of the cavity temperature fuse reaches approximately 302 F 150 C An open cavity temperature fuse indicates overheating of the oven exchange the cavity temperature fuse and check inside of oven cavity and for improper sett...

Page 24: ...with the door open and a closed circuit with the door closed If improper operation is indicated replace the third door interlock switch 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions SECONDARY INTERLOCK SYSTEM TEST DOOR SENSING SWITCH DOOR SENS...

Page 25: ...n 3 Discharge high voltage capacitor See Warnings and Instructions on page 3 1 4 Before performing this test make sure that the primary switch is operating properly according to the above Switch Test Procedure Disconnect the wire lead from the monitor switch COM terminal Check the monitor switch operation by using the ohmmeter as follows When the door is open the meter should indicate a closed cir...

Page 26: ...on tape 6 After that procedure re connect the power supply cord 1 Key Unit 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Check Key unit ribbon connection before replacement 5 Reconnect all leads removed from components during testing 6 Re install the outer case cabinet 7 Reconnect the power supply cord after the...

Page 27: ...sound or continues to sound b Clock does not operate properly c Cooking is not possible When testing is completed 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Reconnect all leads removed from components during testing 5 Re install the outer case cabinet 6 Reconnect the power supply cord after the outer case is ...

Page 28: ...and RY2 Relay Test These relays are operated by D C voltage Check voltage at the relay coil with a D C voltmeter during the microwave cooking operation DC voltage indicated Defective relay DC voltage not indicated Check diode which is connected to the relay coil If diode is good control unit is defective 8 Disconnect the power supply cord and then remove outer case 9 Open the door and block it ope...

Page 29: ...ower transformer 5 Using an ohm meter check between the terminals as described in the following table If incorrect readings are obtained replace the noise filter 6 Reconnect all leads removed from components during testing 7 Re install the outer case cabinet 8 Reconnect the power supply cord after the outer case is installed 9 Run the oven and check all functions MENU 1ST STAGE 2ND STAGE STEAKS CH...

Page 30: ... voltage is delivered to the RY1 driving circuit and RY2 control circuit Magnetron high voltage circuit driving signal To turn on and off the cook relay RY2 The signals holds L level during microwave cooking and H level while not cooking In other cooking modes variable cooking the signal turns to H level and L level in repetition according to the power level Not Used To input signal which communic...

Page 31: ...nal applied to touch key section A pulse signal is input to P53 P57 and P80 terminal while one of G6 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to P53 P57 and P81 terminal while one of G7 line keys on key matrix is touched Key strobe signal Signal applied to touch key section A pulse signal is input to P53 P57 and P82 terminal w...

Page 32: ...Troubleshooting and Testing 3 14 Notes ...

Page 33: ...igh voltage capacitor before touching any oven components or wiring after removing outer case AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY PLEASE FOLLOW INSTRUCTIONS BELOW BEFORE OPERATING THE OVEN 1 Disconnect the power supply cord 2 Make sure that a definite click can be heard when the microwave oven door is unlatched Hold the door in a closed position with one hand then push the door open button...

Page 34: ...nnect wire leads primary and high voltage from power transformer and the filament leads from the magnetron and capacitor terminals 5 Remove four 4 screws holding transformer to bottom plate 6 Remove transformer from bottom plate Re Install 1 Rest transformer on the bottom plate with its primary terminals toward the oven face plate 2 Secure transformer with four screws to bottom plate 3 Re connect ...

Page 35: ...er case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect the high voltage wire A from the high voltage capacitor See Wiring Diagram 5 Disconnect the high voltage wire of high voltage rectifier assembly from the magnetron 6 Disconnect the filament lead short one of the power transformer from the high voltage capacitor 7 Remove one 1 screw holding capacitor holder wi...

Page 36: ...nsulated screwdriver Oven Lamp Socket Terminals Magnetron Duct Positive Lock Connector Terminal Push Pull down 1 2 Lever Positive lock connector Figure 4 2 Oven Lamp Socket Figure 4 3 Positive Lock Connector Positive Lock Connector No Case Type Removal 1 Disconnect oven from power supply and remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Push the lever of ...

Page 37: ... Install the fan blade to the fan motor shaft according to the following procedure 1 Hold the center of the bracket which supports the shaft of the fan motor on the flat table 2 Apply the screw lock tight into the hole for shaft of the fan blade 3 Install the fan blade to the shaft of fan motor by pushing the fan blade with a small light weight ball peen hammer or rubber mallet 3 Reset the fan duc...

Page 38: ...ls check and repair all the controls sensor related ones included of the touch control panel while keeping it connected to the oven b On some models the power supply cord between the touch control panel and the oven proper is long enough that they may be separated from each other For those models it is possible to check and repair the controls of the touch control panel while keeping it apart from...

Page 39: ... Before attaching a new key unit wipe off remain ing adhesive on the control panel frame surfaces completely with a soft cloth soaked in alcohol 2 When attaching key unit to control panel frame adjust upper edge and right edge of the key unit to the correct position of control panel frame 3 Place the key unit firmly to the control panel frame by rubbing with soft cloth not to scratch To discharge ...

Page 40: ...ed screwdriver Door Sensing Switch Primary Switch Third Door Switch And Monitor Switch Adjustment 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor If the door sensing switch primary switch secondary switch and monitor switch do not operate properly due to a misadjustment the following adjustment should be made 4 Loos...

Page 41: ...latch head and latch spring are free 16 Remove door screen from door frame 17 Now door frame is free After adjustment check the following 1 In and out play of door remains less than 0 5mm when in the latched position First check upper position of latch hook pushing and pulling upper portion of door toward the oven face Then check lower portion of the latch hook pushing and pulling lower portion of...

Page 42: ...Cover Figure 4 8 Door Replacement and Adjustment Adhesive Tape Backing Film Sealer Film Figure 4 9 Sealer Film The door on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave energy from the oven cavity during the cook cycle This function does not require that the door be airtight moisture condensation tight or light tight Therefore occasional appearance o...

Page 43: ... N O RY1 OVEN LAMP RELAY CONTROL UNIT SECONDARY INTERLOCK RELAY RY2 NOISE C1 C2 C3 PRIMARY INTERLOCK SWITCH THIRD DOOR SWITCH COM N O OVEN LAMP TURNTABLE MOTOR FAN MOTOR DOOR SENSING SWITCH MONITOR SWITCH N C COM HUMIDITY SENSOR HIGH VOLTAGE HIGH VOLTAGE CAPACITOR RECTIFIER MAGNETRON POWER TRANSFORMER GRY GRY GRY GRY WHT WHT WHT WHT WHT WHT WHT ORG ORG BRN BRN RED YLW BLK FILTER Wiring Schematic O...

Page 44: ...nected to the l a n i m r e t h t i w N k r a m n o e h t r e w o p y l p p u s cord K L B T H W H N E T O N The g n i d n u o r g conductor of the r e w o p y l p p u s cord has n e e b d e d n u o r g y b r e w o p w e r c s g n i x i f d r o c y l p p u s The screw must s y a w l a be t h g i t t p e k M O C O N R O O D G N I S N E S H C T I W S K N P GRN GRN y t i v a c n e v O o t GRN K N P G...

Page 45: ...Wiring Diagrams 5 3 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 8 2 1 3 4 5 6 7 1 2 3 4 8 7 6 5 IC 2 CF CF Wiring Diagram ...

Page 46: ...Wiring Diagrams 5 4 Notes ...

Page 47: ... Q TY 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 Open button Open button spring Screw 3mm x 6mm User caution label H V Capacitor band Chassis support Latch hook Switch lever Magnetron duct Fan blade Fan duct Bottom filler Waveguide cover Turntable motor packing Sensor duct 1 1 1 1 1 5 1 1 1 1 1 1 1 1 1 1 CABINET PARTS 35 36 37 38 39 40 41 Mag cushion Door assembly Door frame assembly Latch head ...

Page 48: ...manual High voltage wire A NHW caution label Special screw Special screw Screw 4mm x 12mm Screw 4mm x 12mm Screw 3mm x 8mm 1 1 1 1 1 1 1 1 5 3 1 4 58 59 60 Screw 4mm x 8mm Special screw Torx tamper proof screw Screw 2 1 ELECTRICAL PARTS REF NO DESCRIPTION Q TY 61 62 63 Screw Outercase screws Built in height label 1 17 5 1 1 SCREWS NUTS AND WASHERS UL screw label ...

Page 49: ...6 3 16 30 49 4 29 34 57 54 12 32 47 46 14 57 9 33 54 54 26 10 7 55 57 58 58 25 60 8 53 6 6 27 53 24 15 15 15 15 56 56 56 48 11 59 56 59 61 61 56 57 5 28 5 56 6 52 35 1 56 13 2 3 x4 62 63 31 Oven And Cabinet Parts ...

Page 50: ...Parts List 6 4 Actual wire harness may be different from illustration 51 45 43 42 41 39 38 22 18 23 21 20 17 19 36 37 40 E L E C T R O L U X Control And Door Parts ...

Page 51: ...eable items DOOR PROTECTION SHEET PLASTIC BAG PACKING CASE TOP PAD ASSEMBLY INTO THE OVEN CAVITY 47 TURNTABLE TRAY 50 OPERATION MANUAL BOTTOM PAD ASSEMBLY TRAY HOLDER 46 TURNTABLE SUPPORT On Top Of Oven Packing and Accessories ...

Page 52: ...Parts List 6 6 Notes ...

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