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Electrolux FGMO205KFA Service Manual
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Electrolux FGMO205KFA Service Manual

Electrolux FGMO205KFA Service Manual

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All About
Servicing
MICROWAVE OVENS
With Electronic Controls
Electrolux Major Appliances; North America
250 Bobby Jones Expwy
Augusta, GA 30907
Publication #5995557609
™
Part # 316439603
January 2009

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Summary of Contents for Electrolux FGMO205KFA

  • Page 1 All About Servicing MICROWAVE OVENS With Electronic Controls ™ Electrolux Major Appliances; North America 250 Bobby Jones Expwy Augusta, GA 30907 Publication #5995557609 Part # 316439603 January 2009...

  • Page 3: Section 1 Basic Information

    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. © 2010 Electrolux Home Products, Inc.

  • Page 4: Table Of Contents

    Section 1 Basic Information This Manual has been prepared to provide Electrolux Service Personnel with Operation and Service Information for Electrolux Microwave Ovens FGMO205KFA, FGMO205KBA, FGMO205KWA and FPMO209KFA. Table of Contents Section 1 Basic Information Section 3 Troubleshooting and Testing Safe Servicing Practices ........
  • 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.

  • Page 7: Before Servicing

    Section 1 Basic Information WARNING Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with the following parts may result in a severe, possibly fatal, Don't Touch! electrical shock. Danger High Inverter unit, that includes High Voltage Capacitor, Voltage High Voltage Power Transformer, High Voltage Rectifier, Heat sink etc., and Magnetron, High Voltage Harness etc..

  • Page 8: Microwave Measurement Procedure Usa

    Section 1 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

    Section 1 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

    Section 1 Basic Information Product Specification Item Description Power Requirements (USA)120 Volts / 14.2 Amperes, 1700 Watts 60 Hertz Single phase, 3 wire grounded Power Output 1200 watts (IEC 705 Test Procedure) Operating frequency of 2450MHz Case Dimensions (excluding handle) Width 24”...

  • Page 11: Grounding Instructions

    Section 1 Basic Information Grounding Instructions Grounded 3-Pronged Plug 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 electric shock by providing an escape wire for the electric current.

  • Page 12: Oven Diagram

    Section 1 Basic Information Oven Diagram 1. One touch door open button. Push to open door. 10. Microwave oven light. It will light when microwave 2. Microwave oven door with see-through window. oven is operating or door is open. 3. Safety door latches. The Microwave Oven will not 11.

  • Page 13: Section 2 Operation

    Section 2 Operation Operating Sequence Description 6. When the door is opened during a cook cycle, the monitor switch, door sensing switch, primary The following is a description of component functions interlock switch, relay (RY1) and secondary during oven operation. interlock relay are activated with the following results.
  • Page 14 Section 2 Operation Figure 2-1. Oven Off Condition Figure 2-2. Oven ON (Cooking) Condition...

  • Page 15: Power Level P-0 To P-90 Cooking

    Section 2 Operation An example of how the sensor works: POWER LEVEL P-0 TO P-90 COOKING (BAKED POTATOES) When Variable Cooking Power is programmed, the Potatoes at room temperature. Vapor is emitted 120 volts A.C. is supplied to the power transformer very slowly.

  • Page 16: Cooking Sequence

    Section 2 Operation Component Descriptions COOKING SEQUENCE 1. Operate the oven in sensor cooking mode by DOOR OPEN MECHANISM referring to the operation manual. The door is opened by pulling the door handle, refer to NOTE the Figure 2-3. The oven should not be operated on Sensor Cooking immediately after plugging in the unit.

  • Page 17: Turntable Motor

    Section 2 Operation Functions: CAVITY TEMPERATURE FUSE 1. When the door is opened, the monitor switch The cavity temperature fuse located on the top of the contact close (to the ON condition) due to their oven cavity, is designed to prevent damage to the oven being normally closed.

  • Page 18: Humidity Sensor Circuit

    Section 2 Operation Humidity Sensor Circuit (3) Detector Circuit of Absolute Humidity Sensor Circuit: This detector circuit is used to detect the output 1. Structure of Absolute Humidity Sensor: voltage of the absolute humidity circuit to allow the The absolute humidity sensor includes two LSI to control sensor cooking of the unit.

  • Page 19: Section 3 Troubleshooting And Testing

    Section 3 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 Section 3 Troubleshooting and Testing...

  • Page 21: Test Procedures

    Section 3 Troubleshooting and Testing Test Procedures Procedure Component Test Letter MAGNETRON ASSEMBLY TEST WARNING 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. 1.
  • Page 22 Section 3 Troubleshooting and Testing Procedure Component Test Letter POWER TRANSFORMER TEST WARNING 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 fi lament and high voltage.) 1.
  • Page 23 Section 3 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 Section 3 Troubleshooting and Testing Procedure Component Test Letter PRIMARY INTERLOCK SWITCH 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 25 Section 3 Troubleshooting and Testing Procedure Component Test Letter MONITOR SWITCH 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 Section 3 Troubleshooting and Testing Procedure Component Test Letter KEY UNIT 1. Re-install the outer case (cabinet). 2. Reconnect the power supply cord after the outer case is installed. 3. Run the oven and check all functions. The following symptoms indicate a defective key unit. a) When touching the pads, a certain pad produces no signal at all.
  • Page 27 Section 3 Troubleshooting and Testing Procedure Component Test Letter KEY UNIT 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 Section 3 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 29 Section 3 Troubleshooting and Testing Procedure Component Test Letter FOIL PATTERN ON THE PRINTED WIRING BOARD TEST To protect the electronic circuits, this model is provided with a fi ne foil pattern added to the primary on the PWB, this foil pattern acts as a fuse. Fuse check and repairs.
  • Page 30 Section 3 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 31 Section 3 Troubleshooting and Testing Procedure Component Test Letter 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 32 Section 3 Troubleshooting and Testing Procedure Component Test Letter R1, R2 : 22Ω ± 1% 1/2W R3 : 4.3Ω ± 5% 1/4W R4 : 1MΩ ± 5% 1/4W Sensor Dummy Resistor Circuit NOISE FILTER TEST 1. Disconnect the power supply cord, and then remove outer case. 2.

  • Page 33: Section 4 Component Teardown

    Section 4 Component Teardown WARNING To prevent an electric shock, take the following precautions: 1. Before wiring: A. Disconnect the power supply. B. Open the door and wedge the door open. C. Discharge the high voltage capacitor and wait for 60 seconds. 2.

  • Page 34: Outer Case Removal

    Section 4 Component Teardown Outer Case Removal Power Transformer Removal Remove the oven from the wall and proceed as follows: REMOVAL 1. Disconnect the power supply cord. 1. Disconnect the power supply cord and then remove 2. Open the door and block it open. outer case.

  • Page 35: High Voltage Rectifi Er And High Voltage Capacitor Removal

    Section 4 Component Teardown High Voltage Rectifi er And High Voltage Magnetron Removal Capacitor Removal 1. Disconnect the power supply cord and then remove outer case. 1. Disconnect the power supply cord and then remove 2. Open the door and block it open. outer case.

  • Page 36: Oven Lamp And Lamp Socket Removal

    Section 4 Component Teardown Oven Lamp And Lamp Socket Removal Positive Lock® Connector (No-Case Type) Removal 1. Disconnect the power supply cord and remove outer case. 1. Push the lever of positive lock connector. ® 2. Open the door and block it open. ®...

  • Page 37: Servicing The Touch Control Panel

    Section 4 Component Teardown Servicing The Touch Control Panel 4. Disconnect the leads to the primary of the power transformer. Precautions For Handling Electronic Components 5. Ensure that these leads remain isolated from other components and oven chassis by using insulation This unit uses CMOS LSI in the integral part of the tape.

  • Page 38: Control Panel Assembly Removal

    Section 4 Component Teardown B. Servicing the touch control panel with power Control Panel Assembly Removal supply from an external power source: 1. Disconnect the power supply cord and remove outer Disconnect the touch control panel completely from the case. oven proper, and short both ends of the door sensing 2.

  • Page 39: Cooling Fan Motor Removal

    Section 4 Component Teardown Cooling Fan Motor Removal 3. Apply the screw lock tight into the hole (for shaft) of the fan blade. Removal 4. Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, lightweight, ball 1.

  • Page 40: Door Sensing Switch, Primary Interlock Switch And Monitor Switch Removal

    Section 4 Component Teardown Absolute Humidity Sensor Removal 6. Remove latch hook assembly from oven flange. 7. Push outward on the two (2) retaining tabs holding 1. Disconnect the power supply cord and remove outer switch in place. case. 8. Switch is now free. At this time switch lever will be 2.

  • Page 41: Door Replacement

    Section 4 Component Teardown 6. Secure the screws with washers firmly. Door Replacement 7. Check all of the switches operation. If any switch REMOVAL has not activated with the door closed, loosen screw 1. Disconnect the power supply cord. and adjust the latch hook position. 2.

  • Page 42: Sealer Film

    Section 4 Component Teardown After any servicing, 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.

  • Page 43: Section 5 Wire Diagrams

    Section 5 Wiring Diagrams Wiring Schematic Oven OFF Condition...

  • Page 44: Wiring Diagram

    Section 5 Wiring Diagrams Wiring Diagram...

  • Page 45: Section 6 Parts List

    Section 6 Parts List Control Panel And Door Parts...
  • Page 46 Section 6 Parts List...
  • Page 47 Section 6 Parts List Oven And Cabinet Parts...
  • Page 48 Section 6 Parts List Packing And Accessories...

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Fgmo205kbaFpmo209kfaFgmo205kwa

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