Electrolux E30MO75HSS Technical & Service Manual
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Electrolux E30MO75HSS Technical & Service Manual

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Technical Service Manual
Microwave Oven
BRUSH DIRECTION
Models
E30MO75HSS
E30MO75HPS
Publication #5995532800
P/N 316439273
April 2009

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Summary of Contents for Electrolux E30MO75HSS

  • Page 1 Technical Service Manual Microwave Oven BRUSH DIRECTION Models E30MO75HSS E30MO75HPS Publication #5995532800 P/N 316439273 April 2009...

  • Page 3: Safe Servicing Practices

    All non-insulated electrical terminals, connectors, heaters, etc. are adequately spaced away from all metal parts and panels. • All safety grounds (both internal and external) are correctly and securely connected. • All panels are properly and securely reassembled. © 2008 Electrolux Home Products, Inc.

  • Page 4: Table Of Contents

    Basic Information This Manual has been prepared to provide Electrolux Service Personnel with Operation and Service Information for Electrolux Microwave Ovens EW30MO75HSS and EW30MO75HPS. Table of Contents Section 1 Basic Information Section 4 Component Teardown Safe Servicing Practices .......... Warnings and Cautions ...........
  • Page 5 THIS SERVICE MANUAL IS INTENDED FOR USE BY PERSONS HAVING ELECTRICAL AND MECHANICAL TRAINING AND A LEVEL OF KNOWLEDGE OF THESE SUBJECTS GENERALLY CONSIDERED ACCEPTABLE IN THE APPLIANCE REPAIR TRADE. ELECTROLUX HOME PRODUCTS CANNOT BE RESPONSIBLE, NOR ASSUME ANY LIABILITY, FOR INJURY OR DAMAGE OF ANY KIND ARISING FROM THE USE OF THIS MANUAL.

  • Page 6: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy

    Before servicing an operative unit, perform a microwave emission 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.

  • Page 7: Before Servicing

    Basic Information MICROWAVE OVENS CONTAIN CIRCUITRY CAPABLE OF PRODUCING VERY HIGH VOLTAGE AND CURRENT. CONTACT WITH THE FOLLOWING PARTS MAY RESULT IN A SEVERE, POSSIBLY FATAL, ELECTRICAL SHOCK. INVERTER UNIT, THAT INCLUDES HIGH VOLTAGE CAPACITOR, HIGH VOLTAGE POWER TRANSFORMER, HIGH VOLTAGE RECTIFIER, HEAT SINK ETC., AND MAGNETRON, HIGH VOLTAGE HARNESS ETC..

  • Page 8: Microwave Measurement Procedure Usa

    Basic Information Microwave Measurement Procedure (USA) A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1 mW/cm 2 at any point 5 cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm 2 at any point 5 cm or more from the external surface of the oven.

  • Page 9: Microwave Measurement Procedure Canada

    Basic Information Microwave Measurement Procedure (Canada) After adjustment of the door switches are completed individually or collectively, switch test and microwave leakage test must be performed with survey instrument and test result must be confirmed to meet the requirement of the performance standard for microwave ovens as under mentioned.

  • Page 10: Product Specification

    Basic Information Product Specification Item Description Power Requirements (USA)120 Volts / 13.7 Amperes (Canada) 117 Volts / 13.0 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 900 watts (IEC 705 Test Procedure) Operating frequency of 2450MHz HPS Unit Dimensions (including handle) Width 30”...

  • Page 11: Grounding Instructions

    Basic Information Grounding Instructions 3-Pronged Plug Grounded Receptacle Box This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code, local codes and ordinances. In the event of an electrical short circuit, grounding reduces the risk of Grounding Pin electric shock by providing an escape wire for the electric...

  • Page 12: Oven Diagram

    Basic Information Oven Diagram 1. Control panel 12. Waveguide cover: DO NOT REMOVE. 2. Ventilation openings 13. Time display: 99 minutes, 99 seconds 3. Model / Serial label 14. Popcorn/Bacon Tray 4. Door seals and sealing surfaces 15. Removable turntable - Place the turntable on the 5.

  • Page 13: Section 2 Operation

    Operation 2. 120 volts AC is supplied to the primary winding of Operating Sequence Description the power transformer and is converted to about The following is a description of component functions 3.0 volts AC output on the filament winding, and during oven operation.
  • Page 14 Operation SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. SCHEMATIC DIAGRAM (DOOR CLOSED,COOK OFF CONDITION) NOISE FILTER UNIT CONV. MAGNETRON OVEN THERMAL THERMAL THERMAL CUT-OUT CUT-OUT CUT-OUT (RY1) L.V. TRANSFORMER (RY1) POWER TRANSFORMER (RY3) (RY2) CONTROL UNIT SECONDARY...

  • Page 15: Variable Cooking

    Operation Variable Cooking 4. When the oven temperature reaches the selected preheat temperature, the following operations occur: When Variable Cooking Power is programmed, the A. The heater relay is de-energized by the control 120 volts AC is supplied to the power transformer unit temperature circuit and thermistor, opening intermittently through the contacts of relay (RY-2).
  • Page 16 Operation AUTOMATIC MIX COOKING CONDITION The relationship between the convection and microwave power operations are as follows. Touch HIGH MIX/ROAST or LOW MIX/BAKE pad first. Program desired cooking time by touching the NUMBER pads. The LOW MIX/BAKE pad is preprogrammed for 325°F with 10% microwave power, while the The ON/OFF time ratio does not correspond with the HIGH MIX/ROAST pad is preprogrammed for 300°F with...

  • Page 17: Sensor Cooking Condition

    Operation SENSOR COOKING CONDITION COOKING SEQUENCE 1. Touch SENSOR COOK pad. Using the SENSOR COOK function, the foods are cooked without figuring time, power level or quantity. NOTE: The oven should not be operated on SENSOR When the oven senses enough steam from the food, it immediately after plugging in the unit.
  • Page 18 Operation COMPU BROIL/ COMPU ROAST/ COMPU BAKE 2. The above procedure is repeated. If the difference between the first voltage measured (in step 1) and COMPU BROIL/ ROAST/ BAKE will automatically the voltage measured when the procedure is compute the oven temperature, microwave power and repeated (step 2) is greater than 300mV the LSI cooking time for baking, roasting and broiling.

  • Page 19: Component Descriptions

    Operation MONITOR SWITCH Component Descriptions The monitor switch is mounted on the middle position of DOOR SENSING AND PRIMARY INTERLOCK SWITCH latch hook. It is activated (the contacts opened) by the The door sensing switch, in the third door switch system lower latch head while the door is closed.

  • Page 20: Magnetron Thermal Switch Cut-Out

    Operation MAGNETRON THERMAL CUT-OUT Humidity Sensor Circuit The thermal cut-out, located on the waveguide, is (1) Structure of Absolute Humidity Sensor: designed to prevent damage to the magnetron if an over The absolute humidity sensor includes two heated condition develops in the magnetron due to thermistors as shown in the illustration.
  • Page 21 Operation (3) Detector Circuit of Absolute Humidity Sensor CONVECTION COOKING SYSTEM Circuit: This oven is designed with a hot air heating system This detector circuit is used to detect the output where food is not directly heated by the heating element, voltage of the absolute humidity circuit to allow the but is heated by forced circulation of the hot air produced LSI to control sensor cooking of the unit.
  • Page 22 Operation 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 DAMPER SHAFT relay (RY4). B. Contacts of shut-off relay (RY4) close, the damper motor is energized, opening the damper door.

  • Page 23: Section 3 Troubleshooting And Testing

    Troubleshooting and Testing Troubleshooting Guide When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the “Test Procedure “section.
  • Page 24 Troubleshooting and Testing (SENSOR CONDITION OFF CONDITION COOKING CONDITION (MICROWAVE) (CONVECTION) COOKING) PROBLEM POSSIBLE CAUSE DEFECTIVE PARTS MAGNETRON POWER TRANSFORMER H.V. RECTIFIER ASSEMBLY HIGH VOLTAGE CAPACITOR PRIMARY INTERLOCK SWITCH SECONDARY INTERLOCK SYSTEM MONITOR SWITCH MONITOR FUSE THIRD DOOR SWITCH THERMAL CUT-OUT CONVECTION HEATER THERMISTOR DAMPER MOTOR...

  • Page 25: Test Procedures

    Troubleshooting and Testing Test Procedures Procedure Component Test Letter MAGNETRON ASSEMBLY TEST HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE OBSERVED. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm.
  • Page 26 Troubleshooting and Testing Procedure Component Test Letter POWER TRANSFORMER TEST 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.) 1.
  • Page 27 Troubleshooting and Testing Procedure Component Test Letter HIGH VOLTAGE CAPACITOR 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.
  • Page 28 Troubleshooting and Testing Procedure Component Test Letter SECONDARY INTERLOCK RELAY 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.
  • Page 29 Troubleshooting and Testing Procedure Component Test Letter BLOWN MONITOR FUSE 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.
  • Page 30 Troubleshooting and Testing Procedure Component Test Letter CONVECTION CUT-OUT (on side of the heater duct) 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.
  • Page 31 Troubleshooting and Testing Procedure Component Test Letter DAMPER MOTOR TEST When the power cord is plugged into the wall receptacle and 120 volts A.C. is supplied to the damper motor, the motor operates until the damper is opened and the damper switch closes. Then the damper motor stops operation.
  • Page 32 Troubleshooting and Testing Procedure Component Test Letter NOISE FILTER TEST 1. Disconnect power supply cord, and 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 leads to the primary of the power transformer. NOISE FILTER 5.
  • Page 33 Troubleshooting and Testing Procedure Component Test Letter RELAY 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.
  • Page 34 Troubleshooting and Testing Procedure Component Test Letter AH SENSOR TEST Checking the initial sensor cooking condition: WARNING: The oven should be fully assembled before following procedure. 1. The oven should be plugged in at least two minutes before sensor cooking. 2.

  • Page 35: Section 4 Component Teardown

    Component Teardown TO PREVENT AN ELECTRIC SHOCK, TAKE THE FOLLOWING PRECAUTIONS: 1. BEFORE WIRING: 1) Disconnect the power supply. 2) Open the door and wedge the door open. 3) Discharge the high voltage capacitor and wait for 60 seconds. 2. DO NOT LET WIRE LEADS TOUCH TO THE FOLLOWING PARTS: 1) High voltage parts: Magnetron, High voltage transformer, High voltage capacitor and High voltage rectifier assembly.

  • Page 36: Outer Case Removal

    Component Teardown Outer Case Removal Power Transformer Removal REMOVAL 1. Disconnect the oven power supply cord and remove outer case. 1. Disconnect oven from power supply before 2. Discharge high voltage capacitor. removing outer case. 2. Discharge the high voltage capacitor before touching any oven components or wiring.

  • Page 37: High Voltage Rectifier Removal

    Component Teardown High Voltage Rectifier Removal Turntable Motor/Coupling Removal 1. Disconnect the oven power supply cord and remove 1. Disconnect the power supply cord. outer case. 2. Remove the turntable tray, and the turntable support 2. Discharge high voltage capacitor. out of the oven cavity.

  • Page 38: Fan Motor Removal

    Component Teardown INSTALLATION Fan Motor Removal 1. Install fan motor to fan duct with the two (2) screws. REMOVAL 2. Install the fan blade to the fan motor shaft according 1. Disconnect the oven power supply cord and remove to the following procedure: outer case.

  • Page 39: Power Supply Cord Replacement

    Component Teardown Power Supply Cord Replacement Convection Motor Removal REMOVAL 1. Disconnect the oven power supply cord and remove outer case. 1. Disconnect the power supply cord. 2. Open the door and block it open. 2. Discharge high voltage capacitor. 3.

  • Page 40: Door Sensing Switch, Primary/Third Interlock

    Component Teardown Heater Unit Assembly Removal Long Nose Plier Heating THERMISTOR REMOVAL Element 1. Disconnect the oven power supply cord and remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. Heating Element To discharge the high voltage capacitor, wait for 60 Holder seconds and then short-circuit the connection of Figure 4-4.
  • Page 41 Component Teardown ADJUSTMENT Monitor Switch If the door sensing switch, primary interlock switch, third Latch Hook Left interlock switch and monitor switch do not operate Latch Head properly due to a misadjustment, the following adjustment Primary should be made. Interlock Switch 1.

  • Page 42: Door Replacement

    Component Teardown Door Replacement 1. Disconnect the oven power supply cord and remove The door on a microwave oven is designed to act outer case. as an electronic seal preventing the leakage of 2. Open the door and block it open. microwave energy from the oven cavity during the 3.

  • Page 43: Door Adjustment

    Component Teardown Door Adjustment Door Disassembly 1. Disconnect the power supply cord and remove outer When removing and/or loosening the oven hinges such case. as in door replacement, the following adjustment criteria 2. Open the door and block it open. are taken.

  • Page 44: Control Assembly And Cpu Unit Removal

    Component Teardown Door Disassembly (Continued) Control Assembly And CPU Unit Removal DOOR PANEL ASSEMBLY AND LEFT AND RIGHT LATCH HEAD REMOVAL CONTROL PANEL ASSEMBLY 10. Remove the fourteen (14) screws holding the door 1. Disconnect the oven power supply cord and remove panel assembly to the door frame.

  • Page 45: Wiring Schematic Oven Off Condition

    Wiring Diagrams Wiring Schematic Oven Off Condition FUSE NOISE SUPPRESSION COIL SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. CLOCK APPEARS ON DISPLAY. 0.22 F AC250V 0.0033 F AC125V 0.0033 F AC125V OVEN LAMP RED・PNK TURNTABLE MOTOR FAN MOTOR CONVECTION MOTOR DAMPER MOTOR HEATING...

  • Page 46: Pictorial Diagram

    Wiring Diagrams Pictorial Diagram...
  • Page 47 Parts List DESCRIPTION REF. NO. Q’TY ELECTRICAL PARTS Power supply cord Monitor fuse 20A and monitor switch (V-5220D-070) assembly Noise filter Primary interlock switch/Third door switch/Door sensing switch Magnetron thermal cut-out 125°C Oven thermal cut-out 150°C Oven lamp Oven lamp socket Fan motor Power transformer H.V.
  • Page 48 Parts List DESCRIPTION REF. NO. Q’TY Chassis support Noise unit angle Cushion Magnetron air guide Thermal protection sheet Thermo cover Thermistor harness Side trim L Side trim R Exhaust duct Bottom angle Inlet louver Shipping angle TT mounting angle Door spring R Door spring L Barrier Bearing assy...
  • Page 49 Parts List Oven And Cabinet Parts...
  • Page 50 Parts List Cabinet And Frame Parts...
  • Page 51 Parts List Control And Door Parts CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS Actual wire harness may be different than illustration.
  • Page 52 Parts List Packing and Accessories PACKING AND ACCESSORIES 85 LOW RACK DOOR PROTECTION SHEET TOP BASE PAD 86 HIGH RACK PLASTIC BAG 44 TURNTABLE TRAY 108 INSTALLATION MANUAL 104 OPERATION MANUAL 43 TURNTABLE SUPPORT PACKING CASE PALLET TRAY PAD Not replaceable items.

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