Jenn-Air JMV8208ACB Service Manual
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Jenn-Air JMV8208ACB Service Manual

Jenn-Air JMV8208ACB Service Manual

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CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.
Microwave Oven
Service Manual
JMV8208ACB/S

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Summary of Contents for Jenn-Air JMV8208ACB

  • Page 1 Microwave Oven Service Manual JMV8208ACB/S CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
  • Page 2 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

    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 JMV8208ACB/S TABLE OF CONTENTS (Page) SAFETY PRECAUTIONS ........................Inside front page SPECIFICATIONS ..............................

  • Page 4: Specifications

    SPECIFICATIONS Rated Power Consumption ........1500W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output ..........1000W (IEC 60705) Frequency ............2,450 MHz ±50 MHz Power Supply .............120 VAC,60 Hz Rated Current ............13.0 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 120V 60Hz 1 2 3 1’ 2’ 3’ FUSE 20A MICOM CONTROLLER ASS’Y L.V.TRANSFORMER CONDENSER OVEN MAIN THERMOSTAT RELAY 110ßC/0ßC 230ßF/32ßF 1’ 2’ 3’ 4’ 5’ 6’ C/TOP LAMP HIGH RELAY 1 2 3 M.G.T HIGH C/TOP LAMP THERMOSTAT...

  • Page 10: Matrix Circuit For Touch Key Board

    MATRIX CIRCUIT FOR TOUCH KEY BOARD KEY MATRIX...

  • Page 11: 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 12: 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 13: 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 14: 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 15: 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 16 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 17 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 18 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 19 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 20 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 21 (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 22 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 23: 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 24 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 25: 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 26: 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 27 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 28 COMPONENTS TEST RESULTS 1. Remove lead wires. VENTILATION MOTOR 2. Measure resistance. Normal: (ohm meter scale:Rx1) Approximately 20 to 40 ohms Abnormal:Infinite 1. Remove wire leads. TURNTABLE MOTOR Normal: Approximately 2. Measure resistance. 2.5 to 3.5 Kohms (ohm meter scale: Rx1000) Abnormal: Infinite or several.
  • Page 29 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 30: 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 31 (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 32 (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.
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  • Page 37: Exploded View

    #EV# EXPLODED VIEW DOOR PARTS FOR MODEL: JMV8208ACB 1005 1004 1002 1011 1000 1008 1003 W203 W127 W150 1006 1007 1009 1701 1707 FOR MODEL: JMV8208ACS 1005 1004 1002 1000 1008 1381 W203 W127 1006 1007 1009 1701 1707...
  • Page 38 #EV# CONTROLLER PARTS FOR MODEL: JMV8208ACB 2006 2004 2381 2002 W106 2000 2009 2008 FOR MODEL: JMV8208ACS 2004 2381 2006 W106 2009 2008...
  • Page 39 #EV# OVEN CAVITY PARTS W142 W142 3010 3031 W105 3001 3024 3009 3029 3043 W202 3005 3036 W178 6000 3045 3018 3037 3032 W121 3011 3025 3026...
  • Page 40 #EV# LATCH BOARD PARTS 4000 W102 4002 4001 4003 4004 4002...
  • Page 41 #EV# INTERIOR PARTS (I) W110 5012 W109 3002 5008 SPECIAL PARTS 3008 5383 W101 5007 W204 5003 3017 5049 W109 5009 3007 W101 5024 5046 5000 W109 5023 3009 5051 3054 W105 5002 5018 W101 W109 W101 3057 W108 5044 3004...
  • Page 42 #EV# INTERIOR PARTS (II) W109 W150 3027 5027 5001 W144 5011 5016 5041 W101 5412 5006 5010 5045 W150 5029 5056 3045 3033 5014 5037 5413...
  • Page 43 #EV# INSTALLATION PARTS 6011 6008 6010 6009 6009 VINYL...
  • Page 44 P/NO : 3828W5S4065 Printed in Korea...

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