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GE JVM1790BK Service Manual
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GE JVM1790BK Service Manual

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삼
흥
정
판
CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.
Microwave Oven
Service Manual
JVM1790BK/CK/SK/WK

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  • Page 1 삼 흥 정 판 Microwave Oven Service Manual JVM1790BK/CK/SK/WK CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Safety Precautions

    CAUTION SAFETY PRECAUTIONS 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. TABLE OF CONTENTS (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front page SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1...

  • Page 4: Specifications

    SPECIFICATIONS Rated Power Consumption - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1600W (Microwave oven only) 1650W (Convection only) Microwave Output - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1000W (IEC60705) Adjustable 100W through 1000W, 10 steps Frequency - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2450 MHz ±...

  • 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 15A or 20A. B. Avoid placing the unit in a location where there is direct heat or splashing water.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS CONTROL PANEL For Model: JVM1790BK JVM1790CK JVM1790SK JVM1790WK...

  • Page 8: Control Panel Instructions

    CONTROL PANEL INSTRUCTIONS 1. TIME COOK: Touch this pad when setting Microwave 10. TIMER: Touch this pad to set the timer. cooking. 11. CLOCK AM/FM: Touch this pad to enter the time of day. 2. CONVECTION BAKE: Touch this pad when setting 12.

  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM For Model: JVM1790BK JVM1790CK JVM1790SK JVM1790WK DISPLAY ERROR MODE THERMAL SENSOR OPEN THERMAL SENSOR SHORT KEYPANEL SHORTED FOR > 60 SECONDS HUMIDITY SENSOR OPEN HUMIDITY SENSOR SHORT...

  • Page 10: Matrix Circuit For Touch Key Board

    MATRIX CIRCUIT FOR TOUCH KEY BOARD For Model: JVM1790BK / JVM1790CK JVM1790SK / JVM1790WK...

  • 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. Operating the oven with no load may shorten the A. The safety systems incorporated in this model are: life of the magnetron. Whenever cooking dry foods (1) Primary interlock switch (dried fish, bread, etc.) or a small amount of food, (2) Secondary interlock switch...

  • Page 12: Service Information

    SERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY (3) Do not operate the unit until it is completely A. SINCE NEARLY 2,100 VOLTS EXISTS IN SOME repaired, if any of the following conditions exist. CIRCUITS OF THIS UNIT REPAIRS SHOULD BE The unit must not be operated.

  • Page 13: Microwave Leakage Test

    MICROWAVE LEAKAGE TEST CAUTIONS MEASURING MICROWAVE ENERGY LEAKAGE • Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to • Pour 275±15cc of 20±5°C(68±9°F) water in a beaker servicing. which is graduated to 600 cc, and place the beaker •...
  • Page 14 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: (5) Remove 7 screws securing the circuit board. UNIT MUST BE DISCONNECTED FROM ELEC- TRICAL OUTLET WHEN MAKING REPAIRS, RE- PLACEMENTS, ADJUSTMENTS AND CONTIN- UITY CHECKS. WAIT AT LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED.
  • 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) Hold the edges of the plastic fastener with (1) Insert the F.P.C.
  • Page 17 B. REMOVING OVEN FROM WALL C. REMOVING THE OUT CASE(Figure 8) (2 PERSONS REQUIRED) (1) Remove the vent grille by removing two screws securing it to the out case. Oven is hooked on metal tabs at bottom of wall (2) Remove two screws securing it to the air duct. mounting plate and fastened to cabinet by (3) top (3) Remove the base plate by removing four screws cabinet bolts.
  • Page 18 D. 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 Latch Board “ADJUSTMENT PROCEDURE” on page 7-12. Primary Interlock Switch Latch Board...
  • Page 19 E. REMOVING MAGNETRON NOTES: • When removing the magnetron, make sure that its (Figures 11 Through 13) dome does not hit any adjacent parts, or it may be (1) Remove the vent grille by loosening two screws. damaged. (Figure 11) (2) Remove the outcase.
  • Page 20 F. REMOVING STIRRER FAN G. REMOVING DOOR (Figure 16) (Figures 14 and 15) (1) Remove the vent grille by two screws securing it to (1) Remove two screws securing it to the oven the outcase loosening. upper plate by using drive screw. (2) Lift up and draw the door.
  • Page 21 I. ASSEMBLING DOOR K. REPLACING THE HUMIDITY SENSOR (1) When mounting the door assembly to the oven (For sensor model only) assembly, be sure to adjust the door assembly (1) Remove the sensor by removing two screws parallel to the chassis. Also adjust so the door has no securing it to the air duct.
  • Page 22 L. REMOVING THE TURNTABLE MOTOR M. REMOVING CONVECTION HEATER, (1) Remove the turntable. THERMISTOR AND DAMPER MOTOR (2) Remove the turntable shaft VERY CAREFULLY (Figure 23) with a slotted screwdriver. (Figure 21) (1) Remove the outer case. (3) Remove the base plate by removing 7 screws (2) Remove the air duct by removing six screws securing it to the oven cavity.

  • 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 (5) Open the oven door slowly. Watch the door latch, (7) When you achieve the proper sequence of the Secondary Switch. Release Rod and Lever switches in Steps 5 and 6, tighten the latch board on the switches to make sure they are zero to the screws at that point.

  • Page 25: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST A. PRIMARY INTERLOCK SWITCH TEST B. SECONDARY 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.

  • Page 26: Test And Checkout Procedures And Trouble Shooting

    TEST AND CHECKOUT PRECEDURES AND TROUBLESHOOTING Filament Winding - CAUTIONS - Secondary Winding - DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVINGING THE CABINET FROM THE UNIT. PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER.
  • Page 27 COMPONENTS TEST PROCEDURES RESULTS HIGH-VOLTAGE 1. Remove wire leads. CAPACITOR 2. Measure resistance. (ohm meter scale: Normal: Rx1000) Momentarily indicates several ohm, and (1) Terminal to terminal then gradually returns to infinite Ohm-meter Figure 25-a Normal: Infinite. (2) Terminal to case Ohm-meter Figure 25-b HIGH-VOLTAGE...
  • Page 28 COMPONENTS TEST PROCEDURES RESULTS TOUCH KEY Measure the resistance between terminal When When not BOARD pins of connector KEY CONNECTOR. touched touched Resistance NOTE: value Less than More than When reconnecting the FPC connector, 400 ohms 1 mega ohm make sure that the holes on the FPC connector are properly engaged with hooks on the plastic fastener.
  • Page 29 COMPONENTS TEST PROCEDURES RESULTS FAN MOTOR 1. Remove wire leads. Normal: (F.M) 2. Measure resistance. Approximately (ohm meter scale: Rx1) CIRCULATION MOTOR 35-55 20-35 (C.M) Abnormal: Infinite or several. VENTILATION 1. Remove wire leads. MOTOR 2. Measure resistance. High (Black-Blue) 35-45 ohm (ohm meter scale: Rx1) Medium (White-Blue)

  • Page 30: Checkout Procedures

    COMPONENTS TEST PROCEDURES RESULTS POWER RELAY 2 1. Measure continuity. LEVEL (ohm meter scale: Rx1) 2. Remove the lead wires and operate 4 sec 18 sec oven at power level 1 through power 6 sec 16 sec level 10. 8 sec 14 sec 10 sec 12 sec...
  • Page 31 (2) CHECKOUT PROCEDURES FOR RELAY. - PROBLEM (A) - FAN motor and oven lamp turn on without touching START key when the door is closed. Remove the mate connector of I/O GOOD CON from the circuit board. Does the unit still operate? Replace the Defective circuit board...
  • Page 32 (3) CHECKOUT PROCEDURES FOR CIRCUIT 6) Wrong figures appear. BOARD 7) The figures of all digits. The following symptoms indicate a defective circuit 8) Some of the indicators do no flicker light up. board. 9) The clock does not keep time properly. 1) The start function fails to operate but the high voltage Systems, the interlock switches, the door sensing and the relay check good.
  • Page 33 - PROBLEM (B) - Actual oven temperature is not displayed. Convection Combination Cook Cook • Program fast bake cook • Remove neon light • 225°F (use dial) • Program bake cook • Press start • 225°F (use dial) • Press start •...
  • Page 34 - PROBLEM (C) - Damper fail to operate. Microwave Convection Cook Cook • Remove neon light • Program time cook • Program bake cook 30 min • 225°F (use dial) • Press start Press start • Display “PREHEAT OFFSET ON” •...
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  • Page 40: Exploded View

    #EV# EXPLODED VIEW DOOR PARTS FOR MODEL: JVM1790BK JVM1790CK JVM1790WK 13581A 13213A 13552A 13551A WTP004 14026A WTT028 14970A 136501 136502 FOR MODEL: JVM1790SK 13581A 13552A 13213A 13551A WWS016 WTP004 9383EA 14026A HARDWARE BAG WSZ131 WWS016 14970A 13651A -8-1-...
  • Page 41 #EV# CONTROLLER PARTS FOR MODEL: JVM1790BK 24781M JVM1790CK JVM1790WK 23551A 23572A For Model WTT027 JVM1790BK For Model WTP013 JVM1790WK WTT029 JVM1790CK 268711 249401 24810P 23506A FOR MODEL: JVM1790SK 24781M 23551A WTP015 WTP013 WTT027 268711 249401 24810P -8-2-...
  • Page 42 #EV# OVEN CAVITY PARTS For Model JVM1790BK WTT027 WTT027 WTT027 WTT027 JVM1790SK WTT029 34960A For Model WTT029 33550P JVM1790WK JVM1790CK WTT028 33530A WTP013 34021A 33112U 36549S WTT021 34930R 33809A 33740B 63303A For Model JVM1790BK 34931A WMP004 WTT027 JVM1790SK WNH001 For Model...
  • Page 43 #EV# LATCH BOARD PARTS 43501A 43500A 466001 WSZ084 466003 466001 44510A -8-4-...
  • Page 44 #EV# INTERIOR PARTS (I) WTT021 WSZ002 WTT037 WTT028 55238A 54974S 56549F 33390G 55900A 54810C 50CZZH 34370T 56851D WSZ002 56324A 35889A 34930W 55893A 569301 WTT028 54810A WSZ002 56170D 56549B WTT028 WTP013 WTT011 53551S WNH003 WWS005 55300S WTT022 53300B 56322A 55013L 55012A 569302 55900C 56930V...
  • Page 45 #EV# INTERIOR PARTS (II) Before • Discord original for parts supplied. • Change pieces simultaneously. 4931W1A009E After 3550W1A264A WTT030 WNH001 WTP004 53550L 53551F 3034W1A004A 54980H WSZ002 56501A 34931A 50FZZA WTT030 WMP004 WTP018 WTT028 56201A 56912E 352642 WTT028 352641 55262A WTT028 56930G WTT028 WTP004...
  • Page 46 #EV# INSTALLATION PARTS WTT028 65862B 63300M 65862D 63861A VINYL *06-1 *06-2 MINI INSTALLATION WALL UPPER & MANUAL TEMPLATE TEMPLATE MANUAL CARE -8-7-...

  • Page 47: Schematic Diagram Of Pcb

    SCHEMATIC DIAGRAM OF P.C.B 10-1...

  • Page 48: Printed Circuit Board

    PRINTED CIRCUIT BOARD 10-2...
  • Page 49 P/NO : 3828W5S4595 Printed in Korea...

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