Electrolux E30MO65GSSB Technical & Service Manual Download Page 44 | Manualshive

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Troubleshooting and Testing

3-20

48

49-53

54-56

57-59

60-64

P10

P07-

P03

P02-

P00

P37-

P35

P34-

P30

OUT

OUT

OUT

OUT

OUT

Segment data signal.

Signal similar to P23.

Key strobe signal.

Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while
one of G-5 line keys on key matrix is touched.

Segment data signal.

Signal similar to P23.

Digit selection signal.

Signal similar to P55.

Digit selection signal.

Signal similar to P55.
Used for initial balancing of the bridge circuit (absolute humidity sensor).

Pin# Signal I/O Description

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42
43
44
45
46
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Summary of Contents for E30MO65GSSB

Page 1: ...Publication 5995557583 P N 316439601 January 2010 Technical Service Manual Microwave Oven Model E30MO65GSSB ...

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: ... 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 Outer Case...

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: ...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 time Convection Temperature for Variable Cooking CONVECTION 100 450 F Temp control LOW MIX BAKE 350 F with 10 microwave power HIGH MIX ROAST 300 F with 30 microwav...

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: ...ckwise 6 Safety door latches The oven will not operate unless the door is securely closed 7 Wave guide cover 8 Door open button 9 Auto Touch control panel 10 Lighted digital display 11 Convection air openings 12 Removable low rack Broiling trivet 13 Removable low rack Baking rack 14 Turntable motor shaft 15 Power supply cord Oven Diagram 1 7 3 10 9 8 2 5 4 12 13 14 15 11 6 6 Touch Control Panel ...

Page 13: ...ament winding voltage heats the magnetron filament and the H V winding voltage is sent to a voltage doubler circuit 4 The microwave energy produced by the magnetron is channeled through the waveguide into the cavity feedbox and then into the cavity where the food is placed to be cooked 5 Upon completion of the cooking time the third transformer oven lamp etc are turned off and the generation of mi...

Page 14: ...Y1 COM RY3 COM RY2 N O RY2 N O RY3 A 9 A 7 CM DM OL FUSE RY2 TTM SCHEMATIC NOTE Condition Of Oven 1 Door closed 2 Cooking Time Programmed 3 Start Pad Touched CONV THERMAL CUT OUT NOISE FILTER MONITOR SWITCH PRIMARY INTERLOCK SWITCH OVEN LAMP FAN MOTOR A5 A3 A1 E 6 CONTROL UNIT DAMPER SWITCH THER MISTOR DOOR SENSING SWITCH AH SENSOR DAMPER MOTOR CONVECTION MOTOR TURNTABLE MOTOR 0 0033µ AC125V 0 003...

Page 15: ...RY1 COM RY3 COM RY2 N O RY2 N O RY3 A 9 A 7 CM DM OL FUSE RY2 TTM 0 022µ AC250V SCHEMATIC NOTE Condition Of Oven 1 Door closed 2 Convection pad touched 3 Desired temperature touched 4 Cooking time programmed 5 Start pad touched CONV THERMAL CUT OUT NOISE FILTER MONITOR SWITCH PRIMARY INTERLOCK SWITCH OVEN LAMP FAN MOTOR A5 A3 A1 E 6 CONTROL UNIT DAMPER SWITCH THER MISTOR DOOR SENSING SWITCH AH SEN...

Page 16: ...y 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 Touc...

Page 17: ...ement to return to selected cooking temperature 4 Upon completion of cooking time the audible signal will sound and oven lamp turntable motor cooling fan motor and convection motor are de energized At the end of the convection cycle if the cavity air temperature is above 275 F the circuit to RY6 will be maintained by the thermistor circuit to continue operation of cooling fan motor until the tempe...

Page 18: ...hen the COMPU DEFROST is selected and the food weight is entered by using the COMPU DEFROST pad the oven will cook according to the special cooking sequence Fire Sensing Feature Microwave Mode This model incorporates a sensing feature which will stop the ovens operation if there is a fire in the oven cavity during microwave cooking This is accomplished by the LSI repeatedly measuring the voltage a...

Page 19: ...ec 64 sec 3 sec Sensing the voltage across temperature measurement circuit 6 sec Sensing Voltage Thermistor Convection Motor 1 LSI This LSI controls the temperature measurement signal AH sensor signal key strobe signal relay driving signal for oven function and indicator signal 2 Power Source Circuit This circuit generates the voltages necessary for the control unit from the AC line voltage 3 Sync...

Page 20: ...s activated the contacts opened by the lower latch head while the door is closed The switch is intended to render the oven inoperative by means of blowing the monitor fuse when the contacts of the relay RY1 and primary interlock switch fail to open when the door is opened Functions 1 When the door is opened the monitor switch contact close to the ON condition due to their being normally closed At ...

Page 21: ...ent THERMISTOR The thermistor is a negative temperature coefficient type The temperature in the oven cavity is detected through the resistance of the thermistor and then the control unit causes the heater relay to operate thus the current to the heating element is turned ON OFF OVEN THERMAL CUT OUT The thermal cut out located on the side of the steam duct is designed to prevent damage to the unit ...

Page 22: ... no hot air will be allowed to leak out the oven cavity Damper Operation 1 When power supply cord is plugged in a When power supply cord is plugged in a signal is sensed in the control unit and operates shut off relay RY4 b Contacts of shut off relay RY4 close the damper motor is energized opening the damper door c When the damper is moved to the open position by the damper cam the damper switch i...

Page 23: ...ircuit 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 are tu...

Page 24: ...Operation 2 12 Notes ...

Page 25: ...pen 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 case...

Page 26: ...Troubleshooting and Testing 3 2 ...

Page 27: ...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 28: ...he 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 dir...

Page 29: ...itor See Warnings and Instructions on page 3 1 4 Isolate the switch and connect the ohmmeter to the common COM and normally open NO terminal of the switch The meter should indicate an open circuit 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 Rein...

Page 30: ...Open the door and block it open 3 Discharge high voltage capacitor See Warnings and Instructions on page 3 1 4 Before performing this test make sure that the primary interlock switch and the secondary interlock relay are operating properly according to the above Test Procedures Disconnect the wire lead from the monitor switch NC terminal Check the monitor switch operation by using the ohmmeter as ...

Page 31: ...cut out An open thermal cut out indicates overheating of the oven cavity 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 MAGNETRON THERMAL CUT OUT on the waveguide 1 Disconnect the power supply cord and then remove outer case 2 Open the door and...

Page 32: ...rge high voltage capacitor See Warnings and Instructions on page 3 1 4 Make sure the heating element is fully cooled and test as follows a Disconnect wire leads and measure the resistance with an ohmmeter On the R x 1 scale the resistance between the heating element terminals should be approximately 10 2 b Disconnect wire leads and measure the insulation resistance with 500V 100M insulation resist...

Page 33: ...ds from the switch terminals and connect ohmmeter leads to the common COM and normally open N O terminals of the switch 1 When switch actuator is pushed by the damper motor cam the meter should be indicated a closed circuit 2 When power cord is plugged into the wall receptacle the damper motor operates and damper cam will start to rotate When the switch actuator is released the meter should be ind...

Page 34: ...or 4 Disconnect the leads to the primary of the power 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...

Page 35: ...ion 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 th...

Page 36: ... keys on the touch screen a certain key produces no signal at all When touching a number key on the touch screen two figures or more are displayed When touching the keys on the touch screen sometimes a key produces no signal 2 3 Other possible problems caused by defective control unit a Buzzer does not sound or continues to sound b Clock does not operate properly c Cooking is not possible d Proper...

Page 37: ...l unit does not respond it is a faulty and must be replaced If a specific pad does not respond the above method may be used after clearing the control unit to determine if the control unit or key pad is at fault RELAY TEST 1 Remove outer case and check voltage between Pin Nos 7 and 9 of the 9 pin connector A on the control unit with an A C voltmeter The meter should indicate 120 volts if not check...

Page 38: ...defective and should be checked PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD PWB IS OPEN To protect the electronic circuits this model is provided with a fine foil pattern added to the primary on the PWB this foil pattern acts as a fuse If the foil pattern is open follow the troubleshooting guide given below for repair Problem POWER ON indicator does not light up At the...

Page 39: ...y and turn off before food is properly cooked 8 After 30 minutes if the sensor has not detected the vapor of the food ERROR will appear and the oven will shut off Water Load Cooking Test Make sure the oven has been plugged in at least five minutes before checking sensor cook operation The cabinet should be installed and screws tightened 1 Fill approximately 200 milliliters 7 2 oz of tap water in a...

Page 40: ...rn off automatically after the water is boiling bubbling If new sensor dose not operate properly the problem is with the control unit CHECKING CONTROL UNIT 1 Disconnect oven from power supply and remove outer case 2 Discharge the high voltage capacitor 3 Disconnect the wire leads from the cook relay 4 Disconnect the sensor connector that is mounted to lower portion of control panel 5 Then connect ...

Page 41: ...mmunicates the damper open close information to LSI Damper opened H level signal 0V GND Damper closed L level signal 5V Temperature measurement input OVEN THERMISTOR By inputting DC voltage corresponding to the temperature detected by the thermistor this input is converted into temperature by the A D converter built into the LSI Digit selection signal The relationship between digit signal and digi...

Page 42: ...ermistor OPEN timing L level 5V Temperature measuring timing Convection cooking Signal to sound buzzer A key touch sound B Completion sound C When the temperature of the oven cavity reaches the preset temperature in the preheating mode or when the preheating hold time 30 minutes is elapsed Timing signal output terminal for temperature measurement OVEN H level GND Thermistor OPEN timing L level 5V ...

Page 43: ... 12 line keys on key matrix is touched Segment data signal Signal similar to P23 Key strobe signal Signal applied to touch key section A pulse signal is input to P24 P27 terminal while one of G 11 line keys on key matrix is touched Segment data signal Signal similar to P23 Key strobe signal Signal applied to touch key section A pulse signal is input to P24 P27 terminal while one of G 10 line keys ...

Page 44: ...signal Signal applied to touch key section A pulse signal is input to P24 P27 terminal while one of G 5 line keys on key matrix is touched Segment data signal Signal similar to P23 Digit selection signal Signal similar to P55 Digit selection signal Signal similar to P55 Used for initial balancing of the bridge circuit absolute humidity sensor Pin Signal I O Description ...

Page 45: ...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 46: ... the high voltage rectifier against the chassis with the use of an insulated screwdriver To discharge the 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 After re installing the transformer secure the transformer wit...

Page 47: ...lding the capacitor holder to the rear cabinet 8 Remove the capacitor from the holder When replacing the silicon rectifier assembly the ground side terminal must be secured firmly with a grounding screw To discharge the 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...

Page 48: ...ng damper motor angle to thermal protection plate right 5 Damper assembly is free 6 Remove one 1 screw holding damper motor to damper motor angle and one 1 screw holding damper switch to damper motor angle 7 Damper motor and switch are free Heater Unit Assembly Removal THERMISTOR REMOVAL 1 Disconnect oven from power supply and remove outer case 2 Discharge high voltage capacitor 3 Disconnect wire ...

Page 49: ... the following illustration Figure 4 2 Heating Element Removal Figure 4 3 Oven Lamp Socket Removal Fan Motor Removal Removal 1 Disconnect the oven power supply cord and remove outer case 2 Discharge high voltage capacitor 3 Disconnect the wire leads from the fan motor 4 Remove one 1 screw holding the fan motor grounding wire to the air guide Right 5 Remove three 3 screws holding the chassis suppor...

Page 50: ...gap between the rotor and the stator of the fan motor because the rotor is easily shaven by pliers and metal pieces may be produced Do not touch the pliers to the coil of the fan motor because the coil may be cut or damaged Do not disfigure bracket by touching with pliers 3 Reset the fan duct assembly to its place 4 Install the tabs of fan duct to the rear cabinet and air guide 5 Install the magne...

Page 51: ... remain isolated from other components and oven chassis by using insulation tape 6 Re connect the power supply cord After checking performance of the touch control panel 1 Disconnect the power supply cord 2 Open the door and block it open 3 Reconnect leads to the primary of power transformer 4 Reinstall the outer case cabinet 5 Reconnect the power supply cord after the outer case is installed 6 Ru...

Page 52: ...g 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 the oven proper in this case you must short both ends of the door sensing switch on PWB of the touch control panel with a jumper which activates an operational state that is equivalent to the oven door being closed As for the se...

Page 53: ... the chassis with the use of an insulated screwdriver Third Door Switch Door Sensing Switch Primary Interlock Switch And Monitor Switch Adjustment If the door sensing switch third door switch primary interlock switch and monitor switch do not operate properly due to a misadjustment the following adjustment should be made 1 Loosen the two 2 screws holding latch hook to the oven cavity front flange ...

Page 54: ...rds Door Adjustment The door can be adjusted by keeping screws of each hinge loose After adjustment make sure of the following 1 Door latch heads smoothly catch latch hook through latch holes and that latch head goes through center of latch hole 2 Deviation of door alignment from horizontal line of cavity face plate is to be less than 1 0mm 3 Door is positioned with its face pressed toward cavity ...

Page 55: ...hes facing up 2 Insert a putty knife thickness of about 0 5mm into the gap between the choke cover and corner portion of door panel as shown in Figure 4 8 to free engaging parts 3 Lift up choke cover 4 Now choke cover is free from door panel Figure 4 8 Door Components As the engaging part of choke cover and door panel are provided at several places do not force any particular part ...

Page 56: ...Component Teardown 4 12 Notes ...

Page 57: ... SENSOR DAMPER MOTOR CONVECTION MOTOR TURNTABLE MOTOR 0 0033µ AC125V 0 022µ AC250V 0 0033µ AC125V NOISE SUPPRESSION COIL HEATIMG ELEMENT MAGNETRON POWER TRANSFORMER H V RECTIFIER CAPACITOR 0 94µ RY4 RY5 RY6 RY1 THIRD DOOR SWITCH MAGNETRON THERMAL CUT OUT OVEN THERMAL CUT OUT 117V 60Hz FM COM RY1 E 5 E 4 E 3 E 2 E 1 F 3 F 2 F 1 RY3 SECONDARY INTERLOCK RERAY N O RY1 COM RY3 COM RY2 N O RY2 N O RY3 A...

Page 58: ...ISTOR 1 2 RED RED RED RED BLK BLK WHT WHT GRN MAGNETRON RED HIGH VOLTAGE COMPONENTS HIGH VOLTAGE CAPACITOR POWER TRANSFORMER P P L BRN ORG RY6 RY4 RY5 CN G RY1 COM RY1 N O RY2 COM ORG RY2 N O RY3 COM RED PNK RY3 N O BRN BRN RED GRY PNK W H T BLK RED GRY G R Y G R Y O R G NOTE Hot ORG wire must be connected to the power transformer terminal nearest to the transformer mounting screw DOOR SENSING SWI...

Page 59: ...Wiring Diagrams 5 3 Control Panel Circuit Diagram ...

Page 60: ...45 R47 C46 C47 R48 R49 CN D CN G CN G CN F CN E ONLY 9X58PJ C7 C9 C5 C6 C21 C4 C2 C22 C1 R3 C3 C60 C50 C30 R45 R91 R92 R93 R64 R80 R81 R73 D70 D71 D72 D73 D74 D75 D76 D77 R72 R71 R70 R79 R78 R77 R76 R75 R74 R86 J8 R90 R7 R100 R40 DAMP SW DOOR SW OVEN TEMP R50 R51 R31 R30 POWER TRANS POWER OL TTM R62 C20 26 CN A ZD2 R2 D3 D4 D1 D2 Q1 Q23 Q26 Q22 E E E E B B B B R63 D26 D21 D20 D7 D22 VRS1 DAMP M CO...

Page 61: ...Parts List 6 1 Key Unit And Door Assembly ...

Page 62: ...Parts List 6 2 Remainder of Parts List is on Page 6 4 ...

Page 63: ...Parts List 6 3 Oven And Cabinet Parts ...

Page 64: ...Parts List 6 4 Packing And Accessories ...

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