Jenn-Air JMV8208AAB Service Manual
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Jenn-Air JMV8208AAB Service Manual

Jenn-Air JMV8208AAB Service Manual

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CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.
Microwave Oven
Service Manual
JMV8208AAB
JMV8208AAQ
JMV8208AAS
JMV8208AAW

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Summary of Contents for Jenn-Air JMV8208AAB

  • Page 1 Microwave Oven Service Manual JMV8208AAB JMV8208AAQ JMV8208AAS JMV8208AAW CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Warning To Service Technicians

    CAUTION WARNING TO SERVICE TECHNICIANS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE 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 microwave source, and make repairs as necessary;...

  • Page 3: Table Of Contents

    FOREWORD Read this Manual carefully.Failure to adhere to or observe the information in this Manual may result in exposing yourself to the Microwave Energy normally contained within the oven cavity. MODEL JMV8208AAB JMV8208AAQ JMV8208AAS JMV8208AAW TABLE OF CONTENTS (Page) SAFETY PRECAUTIONS ........................Inside front page SPECIFICATIONS ..............................

  • Page 4: Specifications

    SPECIFICATIONS Rated Power Consumption ........1700W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output ..........1100W (IEC 60705) Frequency ............2,450 MHz ±50 MHz Power Supply .............120 VAC,60 Hz Rated Current ............14.5 Amp.(Microwave oven+Cook top lamps+Ventilation fan) Magnetron Cooling ..........Forced Air Cooling Rectification ............Rectification Voltage Double Half-Wave Door Sealing ............Choke System Safety Devices ...........Magnetron Thermostat: Open at 145 °C ±5 °C Close at 60 °C ±5 °C...

  • Page 5: Cautions

    CAUTIONS Unlike other appliances,the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connection.

  • Page 6: Installations

    INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. PRECAUTIONS ON INSTALLATION A. Plug the power supply cord into a 120V AC,60Hz, single-phase power source with a capacity of at least 20 amperes. B. Avoid placing the unit in a location where there is direct heat or splashing water.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS CONTROL PANEL...

  • Page 8: Control Panel Instructions

    CONTROL PANEL INSTRUCTIONS 1. DISPLAY: The Display includes a clock and indicators 14. NUMBER: Touch number pads to enter cooking time, to tell you time of day, cooking time setting and cooking power level, quantities, or weights. functions selected. 15. COOK TIME: Touch this pad to to set a cooking time. 2.

  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM (I) *Check the Model No. OVEN 120V THERMOSTAT 60Hz L.V. 1’ 2’ 3’ FUSE 20A TRANS- FORMER CONDENSER MAIN RELAY C/TOP 1 2 3 4 5 6 LAMP HIGH 1’ 2’ 3’ 4’ 5’ 6’ RELAY C/TOP HIGH...

  • Page 10: Schematic Diagram (Ii)

    SCHEMATIC DIAGRAM (II) *Check the Model No. (ADD Noise filter)

  • Page 11: Matrix Circuit For Touch Key Board

    MATRIX CIRCUIT FOR TOUCH KEY BOARD KEY MATRIX...

  • Page 12: General Information For Service

    GENERAL INFORMATION FOR SERVICE GENERAL PRECAUTIONS IN USE FEATURES AND SPECIFICATIONS FEATURES A. Never operate the unit when it is empty. A. The safety systems incorporated in this model are: Operating the oven with no load may shorten the (1) Primary interlock switch life of the magnetron.Whenever cooking dry foods (2) Secondary interlock switch (dried fish,bread,etc.)or a small amount of food,...

  • Page 13: Service Information

    SERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY (3) Do not operate the unit until it is completely repaired,if any of the following conditions exist. The unit must not be operated. A. SINCE NEARLY 4000 VOLTS EXISTS IN SOME (a) The door does not close firmly. CIRCUITS OF THIS UNIT REPAIRS SHOULD BE (b) The hinge is broken.

  • Page 14: Microwave Leakage Test

    MICROWAVE LEAKAGE TEST CAUTIONS EQUIPMENT- • Be sure to check microwave leakage prior to • TESTER ((VOLTS-DC,AC,Ohmmeter) servicing the oven if the oven is operative prior to • Microwave survey meter servicing. - Holaday HI-1500 • The service personnel should inform the HI-1501 manufacture importer, or assembler of any certified - Narda...

  • Page 15: Power Output Measurement

    MEASUREMENT WITH THE OUTER CASE NOTE WHEN MEASURING REMOVED (1) Do not exceed meter full scale deflection. (2) The test probe must be removed no faster than (1) When you replace the magnetron,measure for 1 inch/sec (2.5cm/sec)along the shaded area, microwave energy leakage before the outer case otherwise a false reading may result.

  • Page 16: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES: (4) Remove 5 screws securing the circuit board. UNIT MUST BE DISCONNECTED FROM ELEC- TRICAL OUTLET WHEN MAKING REPAIRS,RE- PLACEMENTS,ADJUSTMENTS AND CONTIN- UITY CHECKS. Circuit Board WHEN RECONNECTING THE WIRE LEADS TO ANY PART,MAKE SURE THE WIRING CONNE- CTIONS AND LEAD COLORS ARE CORRECTLY MATCHED ACCORDING TO THE OVERALL CIR- CUIT DIAGRAM.(ESPECIALLY SWITCHES AND...
  • Page 17 HOW TO REMOVE THE F.P.C. CONNECTOR HOW TO INSERT THE F.P.C. CONNECTOR Follow the steps below as illustrated in Figures 4 Follow the steps below as illustrated in Figures 6 and 5 to remove the F.P.C.connector. and 7 to insert the F.P.C.connector. (1) Insert the F.P.C.connector into the terminal socket securely with the fingers.
  • Page 18 B. REMOVING THE OUT CASE(Figure 8) (1) Remove the vent grille by removing two screws securing it to the out case. (2) Remove two screws securing it to the air duct. (3) Remove the mounting plate by turning the screws (1 or 2 screws)securing it to the out case.
  • Page 19 C REMOVING THE DOOR INTERLOCK SWITCHES (Figures 9,10) (1) Disconnect the wire leads from the interlock switches. (2) Remove two screws securing the Latch Board. (3) Make necessary replacements and check microwave energy leakage according to “ADJUSTMENT PROCEDURES ” on page 7-12. Latch Board Primary Latch Board...
  • Page 20 D. REMOVING MAGNETRON E. REMOVING STIRRER FAN (Figures 11 Through 12) (Figures 13 and 14) (1) Remove the vent grille by loosening two screws. (1) Remove one rivet ASS'Y securing it to the oven (Figure 11) upper plate by using knife blade. (2) Remove the outcase.See page 7-6.
  • Page 21 F. REMOVING DOOR (Figure 15) H. ASSEMBLING DOOR (1) Remove the vent grille by two screws securing it to (1) When mounting the door assembly to the oven the outcase loosening. assembly,be sure to adjust the door assembly (2) Lift up and draw the door. parallel to the chassis.Also adjust so the door has no play between the inner door surface and oven frame NOTES:...
  • Page 22 (3) Carefully pull the ventilation motor ASS'Y out ofthe J. REMOVING THE TURNTABLE MOTOR microwave oven.(See Figure 18-b) (1) Remove the glass tray and rotating ring. (2) Remove the turntable shaft VERY CAREFULLY with a hand.(Figure 19) (3) Remove the base plate by removing 8 screws securing it to the oven cavity.(Figure 20) (4) Disconnect the leadwire from the turntable motor terminals.
  • Page 23 K. REPLACING THE HUMIDITY SENSOR (1) Remove the sensor by removing two screws securing it to the air duct. (See Figure 22) (2) Mount the new humidity sensor to the air duct. Figure 22 7-11...

  • Page 24: Interlock System

    INTERLOCK SYSTEM INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to eliminate completely microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage. ADJUSTMENT PROCEDURES CHECK THE DOOR LATCH AND SWITCH To avoid possible exposure to microwave energy CLOSING.
  • Page 25 TEST THE LATCH AND SWITCH SEQUENCE (7) When you achieve the proper sequence of switches in Steps 5 and 6,tighten the latch board screws at that point. (5) Open the oven door slowly.Watch the door latch, the Secondary Switch.Release Rod and Lever TEST THE MICROWAVE ENERGY LEAKAGE on the switches to make sure they are zero to the body of the switches in the following sequence:...

  • Page 26: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST A. PRIMARY INTERLOCK SWITCH TEST B.S ECONDARY INTERLOCK SWITCH TEST When the door is opened slowly,an audible click Disconnect the wire lead from the secondary should be heard at the same time or successively switch. at intervals and the latches should activate the Connect the ohmmeter leads to the common switches with an audible click (COM)and normally open (NO)terminals of the...

  • Page 27: Test And Checkout Procedures And Troubleshooting

    TEST AND CHECKOUT PRECEDURES AND TROUBLESHOOTING CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT.PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE LEAD WIRES FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. 2.
  • Page 28 COMPONENTS TEST RESULTS 1. Remove wire leads. CAPACITOR 2. Measure resistance. (ohm meter scale: Rx1000) • Terminal to terminal Normal: Momently indicates several ohm, and then gradually returns to infinite • Terminal to case Normal: Infinite. 1. Measure continuity. Forward. Normal:Continuity.
  • Page 29 COMPONENTS TEST RESULTS 1.Remove lead wires. Normal: VENTILATION MOTOR 2.Measure resistance. Approximately 20 to 40 ohms (ohm meter scale:Rx1) Abnormal:Infinite Normal: Approximately 1. Remove wire leads. TURNTABLE MOTOR 2.5 to 3.5 Kohms 2. Measure resistance. Abnormal: (ohm meter scale: Rx1000) Infinite or several.
  • Page 30 COMPONENTS TEST RESULTS Measure the resistance between terminal TOUCH KEY BOARD When When not pins of connector KEY CONNECTOR. touched touched NOTE: Resistance When reconnecting the FPC connector, value More than Less than make sure that the holes on the FPC 1 mega ohm 400 ohms connector are properly engaged with hooks...

  • Page 31: B.checkout Procedures

    B. CHECKOUT PROCEDURES (1) CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION: REPLACE BLOWN FUSE WITH 20 AMPERE FUSE. PROBLEMS CAUSES Fuse blows immediately after the door is closed. Improper operation of the primary interlock,secondary Fuse blows immediately after interlock switches and/or the interlock monitor switch. the door is opened.
  • Page 32 (2)CHECKOUT PROCEDURES FOR RELAY. -PROBLEM (A)- -PROBLEM (A)-- FAN motor turns on without touching Enter/Start key Oven lamp turns on without touching Enter/Start key when the door is closed. when the door is closed. Remove the mate connector of I/O Remove the mate connector of I/O GOOD GOOD...
  • Page 33 (3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit 5) Some segments of one or more digits do not light board. up,or they continue to light up,or segments light 1) Check the input current.If the input current is more when they should not.
  • Page 34 7-22...
  • Page 35 7-23...
  • Page 36 7-24...
  • Page 37 7-25...

  • Page 38: Exploded View

    #EV# EXPLODED VIEW DOOR PARTS FOR MODEL: JMV8208AAB Serial Number ldentification JMV8208AAQ (Figure Check First & Second) JMV8208AAW ex) 1 0 1005 1004 1002 1011 1000 1008 1003 W203 W127 W150 1006 1007 1009 1701 1707 FOR MODEL: JMV8208AAS 1005...

  • Page 39: Controller Parts

    #EV# CONTROLLER PARTS FOR MODEL: JMV8208AAB JMV8208AAQ JMV8208AAW 2006 2004 2381 2002 W106 2000 2009 2008 * Check the Serial No. FOR MODEL: JMV8208AAS 2004 2381 2006 W106 2009 2008 * Check the Serial No.

  • Page 40: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS For Model W107 JMV8208AAB JMV8208AAS For Model For Model JMV8208AAB W142 W142 W121 JMV8208AAW 3010 JMV8208AAS JMV8208AAQ W138 For Model W138 JMV8208AAW 3031 JMV8208AAQ W108 W105 3001 3024 3009 3029 3043 W202 3005 3036 W178 6000...

  • Page 41: Latch Board Parts

    #EV# LATCH BOARD PARTS 4000 W102 4002 4001 4003 4004 4002...
  • Page 42 #EV# INTERIOR PARTS (I) W110 5012 W109 3002 5008 SPECIAL PARTS 3008 5383 W101 5007 5003 3017 5049 W109 5009 W101 3007 5024 5000 W109 5023 3009 5051 3054 5002 W105 5018 W101 W109 W101 5044 3004...
  • Page 43 #EV# INTERIOR PARTS (II - I) Check the rating label of Model Serial No. and order SVC parts according to the Serial No. W109 3027 W150 5001 5027 W144 5412 5016 5011 * Check the W101 Serial No. 5017 5006 5010 5045 W150...
  • Page 44 #EV# INTERIOR PARTS (II - II) Check the rating label of Model Serial No. and order SVC parts according to the Serial No. W109 3027 W150 5001 W144 5027 5412 5016 5011 * Check the W101 Serial No. 5041 5006 5010 5045 W150...
  • Page 45 #EV# INSTALLATION PARTS 6011 6008 6010 6009 VINYL...
  • Page 46 P/NO : 3828W5S3652 Printed in Korea...

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