Bosch HMV9302 - 1.8 cu. Ft. Microwave Service Manual
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Bosch HMV9302 - 1.8 cu. Ft. Microwave Service Manual

Service manual
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See also: Use and Care Manual , Instruction and Installation Manual

MICROWAVE OVEN

SERVICE MANUAL
MODEL: HMV9302
HMV9303
HMV9305
HMV9306
HMV9307
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

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Summary of Contents for Bosch HMV9302 - 1.8 cu. Ft. Microwave

  • Page 1: Microwave Oven

    MICROWAVE OVEN SERVICE MANUAL MODEL: HMV9302 HMV9303 HMV9305 HMV9306 HMV9307 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............................

  • Page 4: Specifications

    SPECIFICATIONS Rated Power Consumption..........1,500W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output..............1000W (IEC 60705) Adjustable 100W through 1000W, 10 steps Frequency ................2,450 MHz 50 MHz Power Supply................120 VAC, 60 Hz Rated Current ...............13 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 Thermal Fuse:...

  • 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: Installation

    INSTALLATION 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...

  • Page 8: Control Panel Instructions

    CONTROL PANEL INSTRUCTIONS 1. Display: The Display includes a clock and 14. Kitchen Timer: Touch this pad to set the kitchen indicators to tell you time of day, cooking time timer. See page 10 for more information. settings and cooking functions selected. 15.

  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM...

  • Page 10: Matrix Circuit For Touch Key Board

    MATRIX CIRCUIT FOR TOUCH KEY BOARD VENT HELP PROGRAM HI/LO/OFF LIGHT CONTROL AUTO HI/LO/OFF SET-UP DEFROST EASY KITCHEN LESS CLOCK COOK TIMER LIGHT FAVORITE TIME POWER TIMER RECIPE DEFROST LEVEL T/TABLE STOP QUICK HOLD START ON/OFF CLEAR DEFROST WARM SENSOR SENSOR SENSOR SENSOR...

  • Page 11: General Information For Service

    GENERAL INFORMATION FOR SERVICE FEATURES AND SPECIFICATIONS GENERAL PRECAUTIONS IN USE 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 MEASURING MICROWAVE ENERGY CAUTIONS 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: 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 moved 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 3 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 INSERT THE F.P.C. CONNECTOR HOW TO REMOVE THE F.P.C. CONNECTOR Follow the steps below as illustrated in Figures 6 Follow the steps below as illustrated in Figures 4 and 7 to insert the F.P.C. connector. and 5 to remove the F.P.C. connector. (1) Insert the F.P.C.
  • 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 PROCEDURE” on page 7-12. Latch Board Secondary Interlock Switch...
  • Page 19 D. 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) •...
  • Page 20 E. REMOVING STIRRER FAN F. REMOVING DOOR (Figure 16) (Figures 14 and 15) (1) Remove the vent grille by two screws securing it to (1) Remove one rivet ASS'Y securing it to the oven the outcase loosening. upper plate by using knife blade. (2) Lift up and draw the door.
  • Page 21 H. ASSEMBLING DOOR (3) Carefully pull the ventilation motor ASS'Y out of the microwave oven. (See Figure 19-b) (1) When mounting the door assembly to the oven assembly, be sure to adjust the door assembly parallel to the chassis. Also adjust so the door has no play between the inner door surface and oven frame assembly.
  • Page 22 K. REMOVING THE TURNTABLE MOTOR NOTES: • Remove the leadwire from the turntable motor VERY (1) Remove the turntable. CAREFULLY. (2) Remove the turntable shaft VERY CAREFULLY • Be sure to grasp the connector not the wires when with a slotted screwdriver. (Figure 20) removing.

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

  • Page 26: Test And Checkout Procedures And Trouble Shooting

    TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTING - CAUTIONS - Secondary - DISCONNECT THE POWER SUPPLY CORD Winding 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 Filament...
  • Page 27 COMPONENTS TEST PROCEDURES RESULTS Measure the resistance: Normal reading: (1) Terminal to terminal Momentarily indicates several ohms, and then gradually returns to infinite ohms. Abnormal reading: Ohm- Indicates continuity or infinite ohms meter from the beginning. HIGH-VOLTAGE Figure 25-a CAPACITOR (2) Terminal to case Normal readings: Infinite.
  • Page 28 COMPONENTS TEST PROCEDURES RESULTS Measure the resistance between terminal When When not pins of connector KEY CONNECTOR. Resistance touched touched 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: Checkout Procedures

    COMPONENTS TEST PROCEDURES RESULTS POWER Check for continuity of relay 2 with an LEVEL ohm-meter. (Remove wire leads from relay 2 and 4 sec 18 sec operate the unit.) 6 sec 16 sec 8 sec 14 sec Relay 2 10 sec 12 sec RELAY2 12 sec...
  • Page 30 (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 31 (3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit 6) Wrong figures appear. board. 7) The figures of all digits. 1) The start function fails to operate but the high 8) Some of the indicators do no flicker light up. voltage Systems, the interlock switches, the door 9) The clock does not keep time properly.
  • Page 32 7-21...
  • Page 33 7-22...
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  • Page 37: Exploded View

    #EV# EXPLODED VIEW DOOR MODEL : HMV9302 HMV9303 HMV9305 HMV9306 HMV9307 1005 1004 1002 1000 1381 W200 1701 1006 W201 1009 1007 1702...
  • Page 38 #EV# CONTROL PANEL 2004 2381 2006 2008 W105 For Model For Model HMV9302 HMV9306 HMV9303 HMV9305 HMV9307 W138 W142 * 07...

  • Page 39: Oven Cavity

    #EV# OVEN CAVITY For Model For Model HMV9302 HMV9306 HMV9303 HMV9305 HMV9307 W108 W138 W142 3010 3038 3031 W109 W138 W142 3029 3001 W121 6001 3014 3036 3032 5038 3018 W121 5036 6000 3028 3033 3026 W121...
  • Page 40 #EV# LATCH BOARD 4001 4000 4002 W102 W111 4003 4002 4004...
  • Page 41 #EV# INTERIOR (I) 3002 5009 3012 W101 5046 5002 W108 3008 5049 5000 5018 3034 W101 W104 5008 W101 5058 5024 W108 5020 5043 3009 5044 5019 3037 5035 W101 3004 W108...
  • Page 42 #EV# INTERIOR (II) W140 3027 W105 5045 W146 5015 5001 5012 5038 5022 5041 W136 W109 W101 5010 5011 5016 5006 W109 5007 5037 5014 W109...
  • Page 43 #EV# INSTALLATION 6011 6008 6010 6009 COOKING OWNERS SERVICE INSTALLATION TEMPLATE GUIDE MANUAL MANUAL MANUAL LABEL...
  • Page 44 February, 2004 P/NO : 3828W5S3298 Printed in Korea...

This manual is also suitable for:

Hmv9305Hmv9302Hmv9306Hmv9307Hmv9303

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