Electrolux EW27MO55HSA Technical & Service Manual
  1. Manuals
  2. Brands
  3. Electrolux Manuals
  4. Microwave Oven
  5. EW27MO55HSA
  6. Technical & service manual

Electrolux EW27MO55HSA Technical & Service Manual

Hide thumbs Also See for EW27MO55HSA:
Table of Contents

Advertisement

Quick Links

Technical Service Manual
Microwave Oven
Models
EW27MO55HSA
EW30MO55HSA
Publication #5995532487
P/N 316439272
April 2009

Advertisement

Table of Contents
loading

Related Manuals for Electrolux EW27MO55HSA

Summary of Contents for Electrolux EW27MO55HSA

  • Page 1 Technical Service Manual Microwave Oven Models EW27MO55HSA EW30MO55HSA Publication #5995532487 P/N 316439272 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 EW27MO55HSA and EW30MO55HSA. 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 Case Dimensions 27”...

  • 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 11. Oven light - It will light when oven is operating or 2. Ventilation openings door is open. 3. Model / Serial label 12. Waveguide cover: DO NOT REMOVE. 4. Door seals and sealing surfaces 13.

  • Page 13: Section 2 Operation

    Operation 6. When the door is opened during a cook cycle, third Operating Sequence Description door switch, monitor switch, door sensing switch, the The following is a description of component functions secondary interlock relay and the primary interlock during oven operation. switch are activated with the following results.

  • Page 14: Schematic Diagram

    Operation SCHEMATIC DIAGRAM 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...

  • Page 15: Variable Cooking

    Operation Variable Cooking 2. Heat Potatoes. Moisture and humidity is emitted rapidly. You can smell the aroma as it cooks. When Variable Cooking Power is programmed, the 120 volts AC is supplied to the power transformer intermittently through the contacts of relay (RY2) which is operated by the control unit within an interval second time base.

  • Page 16: Auto Defrost Cooking

    Operation AUTO DEFROST COOKING MONITOR SWITCH The AUTO DEFROST key is a special function key to The monitor switch is mounted on the middle position of defrost meats and poultry faster and better. AUTO DE- latch hook. It is activated (the contacts opened) by the FROST automatically defrosts roast beef, chicken etc..

  • Page 17: 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 18 Operation (3) Detector Circuit of Absolute Humidity Sensor Circuit: This detector 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 then the detector circuit starts to function and the LSI observes the initial voltage available at its AN6 terminal.

  • Page 19: 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 20 Troubleshooting and Testing CONDITION OFF CONDITION COOKING CONDITION (MICROWAVE) 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 TOUCH CONTROL PANEL KEY UNIT RELAY RY-1 RELAY RY-2...

  • Page 21: 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 22 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 23 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 24 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 25 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 26 Troubleshooting and Testing Procedure Component Test Letter TOUCH CONTROL PANEL ASSEMBLY TEST The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into two units, Control Unit and Key Unit and troubleshooting by unit replacement is described according to the symptoms indicated.
  • Page 27 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 28 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 29 Troubleshooting and Testing Procedure Component Test Letter 1. TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor. 1. Disconnect the power supply cord, and then remove outer case. 2.
  • Page 30 Troubleshooting and Testing Notes 3-12...

  • Page 31: 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 32: 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 33: 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 34: 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 35: Power Supply Cord Replacement

    Component Teardown Power Supply Cord Replacement Door Sensing Switch, Primary/Third Interlock Switch and Monitor Switch REMOVAL Replacement 1. Disconnect the power supply cord. 2. Discharge high voltage capacitor. REMOVAL 1. Disconnect the oven power supply cord and remove outer case. To discharge the high voltage capacitor, wait for 60 2.
  • Page 36 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 Primary properly due to a misadjustment, the following adjustment interlock switch should be made. 3rd door switch 1.

  • Page 37: 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 38: 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 39: 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 40 Component Teardown Notes 4-10...

  • Page 41: Wiring Schematic Oven Off Condition

    Wiring Diagrams Wiring Schematic Oven Off Condition...

  • Page 42: Pictorial Diagram

    Wiring Diagrams Pictorial Diagram...

  • Page 43: Parts List

    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 44 Parts List DESCRIPTION REF. NO. Q’TY Thermal protection sheet Thermo cover Duct Side trim L Side trim R Exhaust duct Bottom angle Inlet louver Shipping angle TT mounting angle Door spring R (EW30MO55HS) Door spring R (EW27MO55HS) Door spring L (EW30MO55HS)/(EW27MO55HS) Barrier DOOR PARTS Door frame assembly...
  • Page 45 Parts List Oven And Cabinet Parts...
  • Page 46 Parts List Cabinet And Frame Parts...
  • Page 47 Parts List Control And Door Parts CONTROL PANEL PARTS DOOR PARTS MISCELLANEOUS Actual wire harness may be different than illustration.

  • Page 48: Packing And Accessories

    Parts List Packing and Accessories 41 TURNTABLE TRAY TOP CROSS SUPPORT 85 INSTALLATION MANUAL 81 OPERATION MANUAL DOOR PROTECTION SHEET TOP BASE PAD 40 TURNTABLE SUPPORT PLASTIC BAG BOTTOM BASE PAD VERTICAL CORNER POST TRAY PAD Not replaceable items. PACKING CASE PALLET...

This manual is also suitable for:

Ew30mo55hsa

Table of Contents