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Frigidaire CGMV173KB Servicing

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All About
Servicing
OVER THE RANGE
MICROWAVE OVENS
1.7 Cu. Ft. Model With Standard And
Electronic Controls
Electrolux Major Appliances; North America
250 Bobby Jones Expwy
Augusta, GA 30907
Publication #5995546412
Part # 316439600
August 2009

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  Summary of Contents for Frigidaire CGMV173KB

  • Page 1 All About Servicing OVER THE RANGE MICROWAVE OVENS 1.7 Cu. Ft. Model With Standard And Electronic Controls ™ Electrolux Major Appliances; North America 250 Bobby Jones Expwy Augusta, GA 30907 Publication #5995546412 Part # 316439600 August 2009...
  • Page 3: Section 1 Basic Information

    Section 1 Basic Information Safe Servicing Practices Avoid personal injury and/or property damage by observing important Safe Servicing Practices. Following are some limited examples of safe practices: 1. DO NOT attempt a product repair if you have any doubts as to your ability to complete the repair in a safe and satisfactory manner.
  • Page 4: Table Of Contents

    Section 1 Basic Information This Manual has been prepared to provide Service Personnel with Operation and Service Information for Frigidaire Microwave Ovens CGMV173KB, CGMV173KW and CGMV174KF. Table of Contents Section 1 Basic Information Section 3 Troubleshooting and Testing Safe Servicing Practices ........1-1 Warnings and Cautions .........
  • Page 5 Section 1 Basic Information WARNING 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, high voltage rectifier, heat sink, etc., magnetron, high voltage harness etc.;...
  • Page 6: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy

    Section 1 Basic Information Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy 1. Do not operate or allow the oven to be operated with the door open. 2. Make the following safety checks on all ovens to be serviced before activating the magnetron or other micro wave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse.
  • 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 Voltage 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 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 9: 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 10: Product Specification

    Section 1 Basic Information Product Specification Item Description Power Requirements 120 Volts / 14.0 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1000 watts (IEC 705 Test Procedure) Operating frequency of 2450MHz Case Dimensions (excluding handle) Width 29-15/16” Height 16-3/8”...
  • Page 11: Grounding Instructions

    Section 1 Basic Information Grounding Instructions 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. Oven door with see-through window. 11. Auto-Touch control panel. 2. Door hinges. 12. Time display: Digital display, 99 minutes, 99 seconds. 3. Waveguide cover. DO NOT REMOVE. 13. Ventilation openings. 4. Turntable motor shaft. 14.
  • Page 13: Section 2 Operation

    Section 2 Operation Operating Sequence Description 6. When the door is opened during a cook cycle, monitor switch, door sensing switch, primary The following is a description of component functions interlock switch, third door switch 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: Ventilation Methods Hot Air Exhaust

    Section 2 Operation VENTILATION METHODS HOT AIR EXHAUST POWER LEVEL P-0 TO P-90 COOKING When Variable Cooking Power is programmed, the 1. Vertical Venting 120 volts A.C. is supplied to the power transformer For this venting method, hot air rising from the intermittently through the contacts of relay (RY2) which conventional range below is drawn in by the hood fan is operated by the control unit within an interval second...
  • Page 16: Sensor Cooking Condition

    Section 2 Operation SENSOR COOKING CONDITION COOKING SEQUENCE 1. Operate the oven in sensor cooking mode by Using the SENSOR COOK function, the foods are cooked referring to the operation manual. without figuring time, power level or quantity. When the oven senses enough steam from the food, it relays the NOTE information to its microprocessor which will calculate the...
  • Page 17: Touch Control Panel Assembly Outline

    Section 2 Operation Touch Control Panel Assembly Outline 7. Relay Circuit To drive the magnetron, fan motor, turntable motor, The touch control section consists of the following units. stirrer motor, hood motor, and light the oven lamp (1) Key unit and hood lamp.
  • Page 18: Component Descriptions

    Section 2 Operation Component Descriptions MONITOR SWITCH The monitor switch is activated (the contacts opened) DOOR OPEN MECHANISM by the latch head on the door while the door is closed. The switch is intended to render the oven inoperative, The door is opened by pulling the door handle, refer to by means of blowing the C/T fuse, when the contacts of the Figure 2-3.
  • Page 19: Thermal Cut-Out (Hood)

    Section 2 Operation THERMAL CUT-OUT (HOOD ) STIRRER MOTOR This thermal cut-out is located on the right base plate. It The stirrer motor drives the stirrer fan to stir the is designed to automatically turn on the hood fan motor microwave radiation from the waveguide.
  • Page 20: Humidity Sensor Circuit

    Section 2 Operation HUMIDITY SENSOR CIRCUIT (3) Detector Circuit of Absolute Humidity Sensor Circuit: 1. Structure of Absolute Humidity Sensor: This detector circuit is used to detect the output The absolute humidity sensor includes two voltage of the humidity circuit to allow the LSI to thermistors as shown in the illustration below.
  • Page 21: 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 22 Section 3 Troubleshooting and Testing Home fuse blows when power cord is plugged into wall receptacle. C /T fuse blows when power cord is plug- ged into wall receptacle. Display does not illuminate when power cord is first plugged into wall receptacle. Display does not operate properly when S TOP clear pad is touched.
  • Page 23: 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 24 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 25 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 26 Section 3 Troubleshooting and Testing Procedure Component Test Letter PRIMARY INTERLOCK SWITCH AND THIRD DOOR 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 27 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 28 Section 3 Troubleshooting and Testing Procedure Component Test Letter HOOD THERMOSTAT 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 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.
  • Page 30 Section 3 Troubleshooting and Testing Procedure Component Test Letter CONTROL UNIT The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure M) to determine if control unit is faulty. 1. In connection with pads. a) When touching the pads, a certain group of pads do not produce a signal.
  • Page 31 Section 3 Troubleshooting and Testing Procedure Letter Component Test KEY UNIT (MEMBRANE 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 32 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 33 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 34 Section 3 Troubleshooting and Testing Procedure Component Test Letter HUMIDITY 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 3 Troubleshooting and Testing Procedure Component Test Letter TESTING METHOD FOR HUMIDITY 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 36 Section 3 Troubleshooting and Testing Procedure Component Test Letter 10. Disconnect the power supply cord, and then remove outer case. 11. Open the door and block it open. 12. Discharge high voltage capacitor. 13. Disconnect the dummy resistor circuit from the sensor connector of control panel. 14.
  • Page 37: 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 38: Hood Exhaust Louver Removal

    Section 4 Component Teardown Removal Of Oven From Wall NOTE (Two persons recommended to remove the oven) The following adjustments or component replacement 1. Disconnect the power supply cord, and uncoil the can be performed without removing the oven from the power supply cord.
  • Page 39: Power Transformer Removal

    Section 4 Component Teardown Power Transformer Removal Hood Fan Motor, Hood Duct, Oven Lamp Socket And AH Sensor Removal REMOVAL 1. Disconnect the power supply cord, remove the oven 1. Disconnect the power supply cord and remove the from wall, and remove outer case. (Refer to oven from wall and remove outer case.
  • Page 40: Magnetron Removal

    Section 4 Component Teardown Magnetron Removal OVEN LAMP SOCKET 15. Screw the oven lamp out from the lamp socket. 1. Disconnect power supply cord, remove oven from 16. Remove the lamp socket from the lamp angle. wall and remove outer case (Refer to procedure 17.
  • Page 41: High Voltage Rectifi Er And High Voltage Capacitor Removal

    Section 4 Component Teardown High Voltage Rectifi er And High Voltage Turntable Motor Removal Capacitor Removal 1. Disconnect the power supply cord. 2. Open the door and block it open. 1. Disconnect power supply cord, remove oven from 3. Remove the three (3) screws holding the base cover wall and remove outer case (Refer to procedure to the oven cavity of “Removal of Oven from Wall”...
  • Page 42: Thermal Cut-Out (Cavity) Removal

    Section 4 Component Teardown Thermal Cut-Out (Cavity) Removal Cooling Fan Motor Removal 1. Disconnect power supply cord, remove oven from REMOVAL wall and remove outer case (Refer to procedure 1. Disconnect the power supply cord, remove the oven of “Removal of Oven from Wall” and “Outer Case from wall and remove outer case (Refer to proce- Removal”.) dure of “Removal of Oven from Wall”...
  • Page 43: Oven Lamp Removal

    Section 4 Component Teardown Oven Lamp Removal 4. Install the fan blade to the shaft of fan motor by pushing the fan blade with a small, light weight, ball 1. Disconnect the power supply cord. peen hammer or rubber mallet. 2.
  • Page 44: Stirrer Motor Removal

    Section 4 Component Teardown Stirrer Motor Removal Servicing The Touch Control Panel 1. Disconnect the power supply cord and remove the Precautions For Handling Electronic Components oven from wall and outer case. (Refer to procedure This unit uses CMOS LSI in the integral part of the of “Removal of Oven from Wall”...
  • Page 45 Section 4 Component Teardown 4. Disconnect the leads to the primary of the power B. Servicing the touch control panel with power transformer. supply from an external power source: 5. Ensure that these leads remain isolated from other Disconnect the touch control panel completely from the components and oven chassis by using insulation oven proper, and short both ends of the door sensing tape.
  • Page 46: Control Panel Assembly And Control Unit Removal

    Section 4 Component Teardown Control Panel Assembly And Control Unit 6. Tear away the graphic sheet from the control panel frame. Removal 7. Tear away the membrane switch from the control 1. Disconnect the power supply cord. panel frame. 2. Open the door and block it open. 3.
  • Page 47: Stop Switch (Door Sensing Switch), Primary

    Section 4 Component Teardown Stop Switch (Door Sensing Switch), Stop Switch (Door Sensing Switch), Primary Interlock Switch, Third Door Primary Interlock Switch, Third Door Switch And Monitor Switch Removal Switch And Monitor Switch Adjustment 1. Disconnect the power supply cord and remove the Removal oven from wall and remove outer case.
  • Page 48: Door Replacement

    Section 4 Component Teardown Door Replacement After adjustment, check the following. 1. In and out play of door remains less than 0.5mm Removal when in the latched position. First check upper 1. Disconnect the power supply cord and remove the position of latch hook, pushing and pulling upper oven from wall and remove outer case.
  • Page 49: Door Disassembly

    Section 4 Component Teardown Door Disassembly NOTE Removal After any service to the door: 1. Disconnect the power supply cord and remove the 1. Make sure that door sensing switch and secondary oven from wall and remove outer case. (Refer to interlock switch are operating properly.
  • Page 50 Section 4 Component Teardown Latch Spring, Latch Head And Door Panel Door Glass For CGMV173KW/KB 13. Release the latch spring from the tab of the latch 13. Remove one (1) screw holding the glass stopper to head and tab of the door panel. the door frame.
  • Page 51: Section 5 Wire Diagrams

    Section 5 Wiring Diagrams Wiring Schematic Oven ON Condition...
  • Page 52: Pictorial Component Diagram

    Section 5 Wiring Diagrams Pictorial Component Diagram...
  • Page 53: Wiring Diagram

    Section 5 Wiring Diagrams Wiring Diagram...
  • Page 54: Control Board

    Section 5 Wiring Diagrams Control Board...
  • Page 55: Section 6 Parts List

    Section 6 Parts List Control Panel Parts DESCRIPTION CONTROL PANEL PARTS AND MISCELLANEOUS Control unit Panel sub. assembly 31-1 Key sheet (Graphic sheet) 31-2 FPC (Membrane switch) 31-3 Control panel See Note 1. 31-4 Key fixing angle 31-5 Screw :3mm x 8mm Screw :3mm x 8mm Installation material assembly Grommet...
  • Page 56: Oven And Cabinet Parts List

    Section 6 Parts List Oven And Cabinet Part Listing NOTE: Parts marked "*" may cause undue microwave exposure. Parts marked "∆" are used in voltage more than 250V. DESCRIPTION DESCRIPTION Capacitor holder ELECTRIC PARTS Stirrer cover assembly High voltage rectifier ∆...
  • Page 57: Oven And Cabinet Parts Exploded View

    Section 6 Parts List Oven and Cabinet Parts Exploded View...
  • Page 58: Door Parts For Cgmv173Kw & Cgmv173Kb

    Section 6 Parts List Door Parts For CGMV173KW & unitl July 2009 production CGMV173KB DESCRIPTION DOOR PARTS FOR CGMV173KW / CGMV173KB Door stopper (NOTE: unitl July 2009 production) Door assembly Door frame Latch head Latch spring Choke cover assembly (NOTE: unitl July 2009 production) Choke cover assembly (NOTE: from August 2009 production) Sealer film...
  • Page 59: Door Parts For Cgmv174Kf

    Section 6 Parts List Door Parts For CGMV174KF unitl July 2009 production DESCRIPTION DOOR PARTS FOR CGMV174KF Door stopper (NOTE: unitl July 2009 production) Door assembly Door frame assembly Latch head Latch spring Choke cover assembly (NOTE: unitl July 2009 production) Choke cover assembly (NOTE: from August 2009 production) Sealer film Door handle...
  • Page 60 Section 6 Parts List Packing and Accessories DESCRIPTION PACKING AND ACCESSORIES Exhaust damper assembly Turntable tray Installation material assembly Installation instruction Operation manual Top template Wall template Grease filter 2 Rack TOP P AD DOOR P R OTE C TOR P R OTE C TION S HE E T WR AP C OVE R TUR NTABLE TR AY...

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