Frigidaire FMV157GS Service Manual
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Frigidaire FMV157GS Service Manual

Over the range microwave oven
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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.
Publication # 5995528261
OVER THE RANGE MICROWAVE OVEN
SERVICE MANUAL
Models
FMV157GS
FMV157GB
FMV157GM
FMV157GQ
FMV157GC
! ATTENTION !
November 2008
CFMV157GS
CFMV157GB
CFMV157GM
CFMV157GQ
CFMV157GC
Part # 316439269

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  • Page 1 OVER THE RANGE MICROWAVE OVEN SERVICE MANUAL Models FMV157GS CFMV157GS FMV157GB CFMV157GB FMV157GM CFMV157GM FMV157GQ CFMV157GQ FMV157GC CFMV157GC ! ATTENTION ! 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.

  • Page 2: Table Of Contents

    https://appliancetechmanuals.com CONTENTS TABLE OF CONTENTS Page PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY..............3 BEFORE SERVICING..............................3 WARNING TO SERVICE PERSONNEL........................4 MICROWAVE MEASUREMENT PROCEDURE......................5 FOREWORD AND WARNING ............................. 6 PRODUCT SPECIFICATIONS .............................

  • Page 3: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy

    FMV157GS FMV157GB FMV157GM FMV157GQ FMV157GC PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPO- SURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not operate or allow the oven to be operated with the door open. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other...

  • Page 4: Warning To Service Personnel

    FMV157GS FMV157GB FMV157GM FMV157GQ FMV157GC WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of pro- ducing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (Example) High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier...

  • Page 5: Microwave Measurement Procedure

    FMV157GS FMV157GB FMV157GM FMV157GQ FMV157GC MICROWAVE MEASUREMENT PROCEDURE A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm at any point 5cm or more from the external surface of the oven, measured prior to...

  • Page 6: Foreword And Warning

    https://appliancetechmanuals.com SERVICE MANUAL ELECTROLUX OVER THE RANGE MICROWAVE OVEN FMV156DBE / FMV156DSE FMV156DQE / FMV156DCF FOREWORD This Manual has been prepared to provide Electrolux Home Prod- ucts Service Personnel with Operation and Service Information for the ELECTROLUX OVER THE RANGE MICROWAVE OVENS, FM- V156DBE, FMV156DSE, FMV156DQE, FMV156DCF.

  • Page 7: Product Specifications

    https://appliancetechmanuals.com FMV157GC PRODUCT SPECIFICATION ITEM DESCRIPTION Power Requirements 120 Volts / 15 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 1000 watts (IEC TEST PROCEDURE) Operating frequency of 2450MHz Case Dimensions Width 29-7/8" Height 16-13/32 Depth 15-1/32" Cooking Cavity Dimensions Width 20-1/4"...
  • Page 8 https://appliancetechmanuals.com FMV157GC Electrical Requirements The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE GROUNDING PIN FROM THE PLUG. The power supply cord and plug must be connected to a separate 120 Volt AC, 60 Hz, 15 Amp. or more dedicated line, using a grounded receptacle.
  • Page 9 https://appliancetechmanuals.com CONTROL PANEL Page 9...

  • Page 10: Operation

    https://appliancetechmanuals.com FMV157GC OPERATION DESCRIPTION OF OPERATING SEQUENCE of the primary interlock switch, and door sensing switch The following is a description of component functions dur- is mechanically associated with the door so that it will ing oven operation. function in the following sequence. OFF CONDITION (1) When the door opens from a closed position, the secondary interlock relay, door sensing switch, and...
  • Page 11 https://appliancetechmanuals.com VENTILATION METHODS HOT AIR EXHAUST 1. VERTICAL VENTING For this venting method, hot air rising from the conventional range below is drawn in by the hood fan motor through the grease filters at the right and left sides of the base cover, up through the right and left sides of the oven cavity, then discharged vertically at rear center top of the oven, into the customer's vent system.
  • Page 12 https://appliancetechmanuals.com FMV157GC SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. CLOCK APPEARS ON DISPLAY. Figure O-1. Oven Schematic-Off Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. COOKING TIME PROGRAMMED. 3. VA R I A B L E C O O K I N G C O N T RO L "HIGH".
  • Page 13 https://appliancetechmanuals.com FMV157GC DESCRIPTION AND FUNCTION OF COMPONENTS CAUTION: BEFORE REPLACING A BLOWN MONITOR DOOR OPEN MECHANISM FUSE TEST THE DOOR SENSING SWITCH, The door is opened by pulling the door handle, refer to the SECONDARY INTERLOCK RELAY (RY2), RE- Figure D-1. LAY (RY1), PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER Latch heads...

  • Page 14: Troubleshooting Guide

    https://appliancetechmanuals.com FMV157GC TROUBLESHOOTING GUIDE Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is con- nected. 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.
  • Page 15 https://appliancetechmanuals.com...

  • Page 16: Test Procedure

    https://appliancetechmanuals.com FMV157GC TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER MAGNETRON ASSEMBLY 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. 4. 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 17 https://appliancetechmanuals.com FMV157GC TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) HIGH VOLTAGE RECTIFIER TEST 1. Disconnect the power supply cord, and then remove outer case. 2.
  • Page 18 https://appliancetechmanuals.com FMV157GC TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE TEMPERATURE FUSE. 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.
  • Page 19 https://appliancetechmanuals.com FMV157GC TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER SECONDARY INTERLOCK RELAY (RY2) 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. Disconnect two (2) wire leads from the male tab terminals of the Secondary Interlock Relay. Check the state of the relay contacts using a ohmmeter.
  • Page 20 https://appliancetechmanuals.com FMV157GQ TEST PROCEDURES FMV157GC PROCEDURE COMPONENT TEST LETTER HOOD THERMAL CUT-OUT 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. 4. A continuity check across the thermal cut-out terminals should indicate an open circuit unless the temperature of the thermal cut-out reaches approximately 158½F(70½C) or more.
  • Page 21 https://appliancetechmanuals.com FMV157GC TEST PROCEDURES 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 22 https://appliancetechmanuals.com FMV157GC TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER When testing is completed, 1) Disconnect the power supply cord. 2) Open the door and block it open. 3) To discharge high voltage capacitor, wait for 60 seconds. 4) Reconnect all leads removed from components during testing. 5) Re-install the hood intake duct R.
  • Page 23 https://appliancetechmanuals.com FMV157GC TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER 7. After that procedure, re-connect the power supply cord. 8. Check voltage between normal open terminal of the relay RY2 and the normal open terminal of the relay RY1 on the control unit with an A.C. voltmeter. The meter should indicate 120 volts, if not check oven circuit.
  • Page 24 https://appliancetechmanuals.com TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER STEPS OCCURRENCE CAUSE OR CORRECTION Only pattern at "a" is broken. *Insert jumper wire J1 and solder. Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d". 6) Make a visual inspection of the varistor. Check for burned damage and examine the transformer with a tester for the presence of layer short-circuit (check...
  • Page 25 https://appliancetechmanuals.com FMV157GC TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER NOISE FILTER 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. 4. Disconnect the leads to the primary of the power transformer. 5.

  • Page 26: Touch Control Panel Assembly

    https://appliancetechmanuals.com FMV157GC TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units Symbol Voltage Application as shown in the touch control panel circuit. -5.3V LSI(IC1) (1) Key Unit 3) Synchronizing Signal Circuit (2) Control Unit (The Control unit consists of LSI Unit and The power source synchronizing signal is available in Power U nit)
  • Page 27 https://appliancetechmanuals.com FMV157GC Pin No. Signal Description Back light circuit (Light emitting diodes) driving signal. To input signal which communicates the door open/close information to LSI. Door close "H" level signal (0V). Door open "L" level signal (-5V). 9-10 AN1-AN0 Terminal not used. 11-13 P57-P55 Terminal not used.
  • Page 28 https://appliancetechmanuals.com FMV157GC Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one of G7 line keys on key matrix is touched. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one of G6 line keys on key matrix is touched.
  • Page 29 https://appliancetechmanuals.com FMV157GC SERVICING 1. Precautions for Handling Electronic Components transformer. This unit uses CMOS LSI in the integral part of the circuits. 4) Re-install the outer case (cabinet). When handling these parts, the following precautions 5) Re-connect the power supply cord after the outer should be strictly followed.

  • Page 30: Component Replacement And Adjustment Procedure

    https://appliancetechmanuals.com FMV157GC COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE: Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in severe, possibly fatal, electric shock. (Example) High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
  • Page 31 https://appliancetechmanuals.com 5. Pull the hood exhaust louver from the oven cavity by Push pushing the right and left tabs of the hood exhaust louver Hood exhaust to remove. louver 6. Now, the hood exhaust louver is free. Tab (left ) Push Tab (right) REMOVAL OF OVEN FROM WALL (Two persons recommended to remove the oven)
  • Page 32 https://appliancetechmanuals.com FMV157GQ FMV157GC the hood duct and release the snap band from the hood duct.Remove one (1) screw holding the 6. Now, the hood fan motor is free. Hood fan motor on the rear cavity 5. Remove the hood fan motor from the oven cavity top plate by lifting it up.
  • Page 33 https://appliancetechmanuals.com FMV157GQ COOLING FAN MOTOR REMOVAL FMV157GC 1. Disconnect the power supply cord, remove the Hood 5. Disconnect the wire leads from the control panel. Exhaust louver from the cavity. (Refer to procedure 6. Remove two (2) screws holding the fan motor to fan of "Removal of Hood Exhaust louver".) duct.
  • Page 34 https://appliancetechmanuals.com FMV157GC TURNTABLE MOTOR AND FOOD LAMP SOCKETS REMOVAL 1. Disconnect the power supply cord. 8.Now the turntable motor is free. 2. Open the door and block it open. HOOD LAMP SOCKET 3. Remove the three (3) screws holding the base cover to 9.
  • Page 35 https://appliancetechmanuals.com FMV157GC fixing plate. 3. When attaching the key unit to the key fixing plate, adjust 14.Release the two (2) tabs holding the power unit to the the upper edge and right edge of the key unit to the correct key fixing plate.
  • Page 36 https://appliancetechmanuals.com FMV157GC After adjustment, check the following. Latch heads 1. In and out play of door remains less than 0.5mm when Latch hook in the latched position. First check upper position of latch hook, pushing and pulling upper portion of door toward the oven face.
  • Page 37 https://appliancetechmanuals.com FMV157GC DOOR DISASSEMBLY 1. Disconnect the power supply cord. DOOR FRAME ASSEMBLY 2. Open the door and block it open. 11.Remove two (2) screws holding the door panel to the 3. To discharge the high voltage capacitor, wait for 60 door frame assembly.

  • Page 38: Schematic Diagram

    https://appliancetechmanuals.com Page 38...

  • Page 39: Wiring Diagram

    https://appliancetechmanuals.com YW-32 DOOR OG:ORANGE BR:BROWN SENSING YW:YELLOW WH:WHITE WH-31 SWITCH RD:RED BK:BLACK YW-32 BL:BLUE GY:GREY BK-17 PK:PINK T/TABLE GN:GREEN WH-31 WH-15 MOTOR WH-15 BK-24 GROUND WH-7 HARNESS LEADS BL-25 WH-16 MOTOR PARTS LEADS GY-26 GN-23 OG-18 BL-20 OG-18 YW-6 OVEN BR-22 BK-17 LAMP...

  • Page 40: Exploded Parts Diagram

    https://appliancetechmanuals.com OVEN,CABINET Page 40...
  • Page 41 https://appliancetechmanuals.com FMV157G OVEN,CABINET POS. NO DESCRIPTION POS. NO DESCRIPTION Cover, waveguide Grille, exhaust Cover, unit base, black Cover, control shield, right Base, transformer, right side Cover, lamp, oven cavity Magnetron Hardware Kit, installation Thermostat, cutout, magnetron 33 # Filter, charcoal, inside exhaust Thermostat, cutout, oven cavity 34 # Motor, turntable...
  • Page 42 https://appliancetechmanuals.com CONTROL PANEL,DOOR,MISC. Page 42 11/07...
  • Page 43 https://appliancetechmanuals.com FMV157G CONTROL PANEL, DOOR, MISC. POS. NO DESCRIPTION Control Assembly Frame, control panel Panel, control mount, bracket Control Board, printed circuit Door Assembly Handle Assy, w/holder Panel, outer door Panel, glass, outer door Panel, inner door Spring, door latch 11 # Latch, door Frame, choke cover, inner door...

  • Page 44: Packing And Accessories

    https://appliancetechmanuals.com PACKING AND ACCESSORIES 31 TURNTABLE TRAY INSTALLATION INSTRUCTIONS TOP PAD GREASE FILTER (x 2) 70 TOP/WALL TEMPLATE DOOR PROTECTOR OPERATION MANUAL INSTALL MATERIAL ASSEMBLY WRAP COVER EXHAUST DAMPER ASSEMBLY ACCESSORY PACK DOOR PAD BOTTOM PAD Non-replaceable items PACKING CASE Page 44...

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