Bosch HMV8050 Service Manual
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Bosch HMV8050 Service Manual

Bosch HMV8050 Service Manual

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삼
흥
정
판
MICROWAVE OVEN
SERVICE MANUAL
MODEL: HMV8050
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

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  • Page 1 삼 흥 정 판 MICROWAVE OVEN SERVICE MANUAL MODEL: HMV8050 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

    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 ........Microwave 1500 W Convection 1500 W Microwave Output ..........Microwave 850 W (IEC60705) Convection 1350 W Frequency ............2450 MHz ± 50 MHz Power Supply .............120 V~ 60 Hz Rated Current ............Microwave 13.0 A Convection 13.0 A Magnetron Cooling ..........Forced Air Cooling Rectification ............Rectification Voltage Double Half-Wave Door Sealing ............Choke System Safety Devices ...........Magnetron Thermostat: Open at 150 °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 13. CUSTOM SET: Touch this pad to change the oven’s to tell you time of day, cooking time settings, and default settings for sound, clock, display speed, and cooking functions selected.

  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM...

  • Page 10: Matrix Circuit For Touch Key Board

    MATRIX CIRCUIT FOR TOUCH KEY BOARD KEY MATRIX CUSTOM MICRO. CONV. COMBI. COOK (VENT) (VENT) (VENT) LIGHT AUTO SOFTEN MELT ON/OFF ON/OFF TIME SET 5-SPEED SPEED SENSOR SENSOR SENSOR AUTO AUTO POPCORN COOK REHEAT DEFROST 30 SEC. COMBI CUSTOM AUTO KITCHEN TURNTABLE MORE...

  • 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.

  • 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.

  • 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 OUTSIDE 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 4 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 Circuit Board 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) Insert the F.P.C.
  • Page 17 B. REMOVING THE OUTSIDE CASE (Figure 8) (1) Remove the vent grille by removing two screws securing it to the outside 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 NOTES: • When removing the magnetron, make sure that its (Figures 11 Through 13b) 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 outside case.
  • Page 20 E. REMOVING STIRRER FAN F. REMOVING DOOR (Figure 16) (Figures 14 and 15) (1) Remove the vent grille by removing two screws (1) Remove two screws securing it to the oven securing it to the outside case loosening. upper plate by using drive screw. (2) Lift up and remove the door.
  • Page 21 H. ASSEMBLING DOOR J. 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 K. REMOVING THE TURNTABLE MOTOR L. REMOVING CONVECTION HEATER (1) Remove the turntable. AND THERMISTOR (Figure 23) (2) Remove the turntable shaft VERY CAREFULLY (1) Remove the out case. with a slotted screwdriver. (Figure 21) (2) Remove the air duct by removing six screws (3) Remove the base plate by removing 7 screws securing it to the oven front plate, guide air and 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 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. 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 (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 CAPACITOR 1. Remove wire leads. 2. Measure resistance. (ohm meter scale: Rx1000) Normal: • Terminal to terminal Momently indicates several ohm, and then gradually returns to infinite • Terminal to case Normal: Infinite. DIODE Some inexpensive meters 1.
  • Page 28 COMPONENTS TEST RESULTS VENTILATION MOTOR 1. Remove wire leads. Normal: 2. Measure resistance. Approximately (ohm meter scale: Rx1) 60 to 80 ohm DAMPER MOTOR (D.M) 1. Remove wire leads. Normal:Approximately TURNTABLE MOTOR (T.M) 2. Measure resistance. STIRRER MOTOR (S.M) (ohm meter scale: Rx1000) 2.3-3.5 2.6-3.5 100-170 Kohm...
  • Page 29 COMPONENTS TEST RESULTS TOUCH KEY BOARD Measure the resistance between terminal When When not pins of 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: 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 START/ENTER Oven lamp turns on without touching START/ENTER key when the door is closed. key 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 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 33: Troubleshooting

    C. TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE TOASTER AND MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1.
  • Page 34 (TROUBLE 1) The following visual conditions indicate a probable defective control circuit. 1. Incomplete segments. • Segment missing. • Partial segment missing. • Digit flickering (NOTE: Slight flickering is normal.) 2. Colon does not turn on or blink. 3. A distinct change in the brightness of one or more numbers in display. 4.
  • Page 35 (TROUBLE 2) Microwave oven does not operate at all, Display window does not display any figures, and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of the Replace fuse, Check continuity 1. Fuse blows. Continuity. monitor switch. primary, monitor of monitor switches, and switch (with...
  • Page 36 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START/ENTER pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Defective Replace Check continuity 1.Setting time does No continuity. secondary switch. secondary switch.
  • Page 37 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY Defective P.C.B No microwave Disconnect the Replace P.C.B No continuity. assembly oscillation. wire leads from assembly relay 8 and check continuity Continuity.
  • Page 38 (TROUBLE 6) Convection oven does not operate at all or convection cook is bad. CONDITION CHECK RESULT CAUSE REMEDY Defective Relay Replace Relay Check the Relay Convection indicator Abnormal. 10 of P.C.B. light but oven does assembly. not go into cook cycle when START/ENTER Normal.

  • Page 39: Exploded View

    #EV# EXPLODED VIEW INTRODUCTION INSTALLATION PARTS OVEN CAVITY PARTS INTERIOR PARTS LATCH BOARD PARTS DOOR PARTS CONTROL PANEL PARTS...
  • Page 40 #EV# DOOR PARTS 1005 1004 1000 W200 1381 1701 1006 W201 1009 1007 1702...
  • Page 41 #EV# CONTROLLER PARTS 2004 2381 2006 W105 2008 * 07...
  • Page 42 #EV# OVEN CAVITY PARTS 3010 W142 3031 W105 3001 3024 3009 3029 3103 3057 6001 W202 3005 W109 W178 6000 5382 3037 3032 9000 W121 3011 3025 3026...
  • Page 43 #EV# LATCH BOARD PARTS 4001 4000 4002 W111 4003 4002 4004...
  • Page 44 #EV# INTERIOR PARTS (I) W109 W110 W101 5052 3048 W109 5003 5012 3044 5007 5002 5000 3002 3012 5018 W101 5023 3006 5009 W109 3008 5024 5067 5008 W109 5062 5029 3206 W119 W121 W125 W141 W105 W124 3207 5403 W121 5021 5411...
  • Page 45 #EV# INTERIOR PARTS (II) W172 W178 5045 5385 W136 5800 5056 5011 W202 3021 W109 5382 3051 W106 W109 5006 5412 W140 W109 5016 W136 W109 5037 5010 3027 5001 5041 5410 5014 W140...
  • Page 46 #EV# INSTALLATION PARTS 6011 6008 6010 6009 VINYL COOKING WALL *06-1 UPPER *06-2 INSTALLATION & GUIDE TEMPLATE TEMPLATE MANUAL CARE LABEL...
  • Page 47 March, 2008 P/NO : MFL07543202 Printed in Korea...

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