Bosch HMV5053C Manual
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Bosch HMV5053C Manual

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All About
Servicing
OVER THE RANGE
This manual is designed to be used by qualified service personnel only.
Due to the complexity and the risk of high-voltage electrical shock,
Bosch does not recommend that customers service their own units.
MICROWAVE OVENS
This material is intended for the sole use of BSH authorized persons
and may contain confidential and proprietary information. Any
unauthorized review, use, copying, disclosure, or distribution in any
format is prohibited.
HMV505 U
HMV505 C

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  • Page 1 This manual is designed to be used by qualified service personnel only. Due to the complexity and the risk of high-voltage electrical shock, Bosch does not recommend that customers service their own units. MICROWAVE OVENS This material is intended for the sole use of BSH authorized persons and may contain confidential and proprietary information.

  • Page 2: Safe Servicing Practices

    Section 1 Basic Information Safe Servicing Practices Avoid personal injury and/or property damage by observing important Safe Servicing Practices. Following are some limited examples of safe practices: 1. DO NOT attempt a product repair if you have any doubts as to your ability to complete the repair in a safe and satisfactory manner.

  • Page 3: Table Of Contents

    Section 1 Basic Information This Manual has been prepared to provide Authorized Service Personnel with Operation and Service Information for Bosch Microwave Hood C ombination Models: HMV5053U, HMV5053C. Table of Contents Section 1 Basic Information Section 3 Troubleshooting and Testing Safe Servicing Practices ........
  • Page 4 Section 1 Basic Information WARNING Certain in ternal parts are intentionally not grounded and present a risk of electrical shock only during servicing. Service personnel - do not contact the following parts while the appliance is energized: Inverter unit, that includes high voltage capacitor, high voltage power transformer, high voltage rectifier, heat sink, etc., magnetron, high voltage harness etc.;...

  • Page 5: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwave Energy

    If the unit operates with the door open, service person should: 1. Tell the user not to operate the oven. 2. Contact BOSCH Home Service and Food and Drug Administration’s Center for Devices and Radiological Health immediately. Service personnel should inform BSH Home Appliances of any certified unit found with emissions in excess of 5mW/cm2.

  • Page 6: Before Servicing

    Section 1 Basic Information WARNING Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with the following parts may result in a severe, possibly fatal, Don't Touch! electrical shock. Danger High High Voltage Circuit, that includes High Voltage Capacitor, Voltage High Voltage Power Transformer, High Voltage Rectifier, Heat sink etc., and Magnetron, High Voltage Harness etc..

  • Page 7: Microwave Measurement Procedure Usa

    Section 1 Basic Information Microwave Measurement Procedure (USA) A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1 mW/cm 2 at any point 5 cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm 2 at any point 5 cm or more from the external surface of the oven.

  • Page 8: Microwave Measurement Procedure Canada

    Section 1 Basic Information Microwave Measurement Procedure (Canada) After adjustment of the door switches are completed individually or collectively, switch test and microwave leakage test must be performed with survey instrument and test result must be confirmed to meet the requirement of the performance standard for microwave ovens as under mentioned.

  • Page 9: Product Specification

    Section 1 Basic Information Product Specification Item Description Power Requirements (USA)120 Volts / 14.8 Amperes, 1650 Watts 60 Hertz Single phase, 3 wire grounded Power Output 0 watts (IEC 705 Test Procedure) Operating frequency of 2450MHz Width 29.88 ” Case Dimensions (excluding handle) Height 17.56”...

  • Page 10: Grounding Instructions

    Section 1 Basic Information Grounding Instructions 3-Pronged Plug Grounded Receptacle Box This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed and grounded in accordance with the National Electrical Code, local codes and ordinances. In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric current.

  • Page 11: Oven Diagram

    Section 1 Basic Information Oven Diagram 4. Vent Top The microwave oven is designed to make 5. Glass Turntable: your cooking experience as enjoyable and The turntable reverses rotation each time the productive as possible. To get you up and microwave oven door is opened and closed.

  • Page 12: Section 2 Operation

    Sect ion 2 Oper at ion Oper at ing Sequence Descript ion 6. When the door is opened during a cook cycle, monitor switch, door sensing switch, primary The following is a description of component functions interlock switch, and secondary interlock relay are during oven operation.

  • Page 13: Ventilation Methods Hot Air Exhaust

    Section 2 Operation VENTILATION METHODS HOT AIR EXHAUST POWER LEVEL P-0 TO P-90 COOKING When Variable Cooking Power is programmed, the 1. Vertical Venting 120 volts A.C. is supplied to the power transformer For this venting method, hot air rising from the intermittently through the contacts of relay (RY2) which conventional range below is drawn in by the hood fan is operated by the control unit within an interval second...
  • Page 14 Section 2 Operation For HMV505 U:...
  • Page 15 Section 2 Operation For HMV505 C:...

  • Page 16: Touch Control Panel Assembly Outline

    Section 2 Operation Touch Control Panel Assembly Outline 7. Relay Circuit To drive the magnetron, fan motor, turntable motor, The touch control section consists of the following units. hood motor, and light the oven lamp and hood lamp. (1) Key unit 8.

  • Page 17: Monitor Switch

    Section 2 Operation MONITOR SWITCH THERMAL CUT-OUT (HOOD) The monitor switch is activated (the contacts opened) This thermal cut-out located on the right base plate. It by the latch head on the door while the door is closed. is designed to automatically turn on the hood fan motor The switch is intended to render the oven inoperative, by whenever the hot air rising from the conventional range means of blowing the monitor fuse, when the contacts of...

  • Page 18: Section 3 Troubleshooting And Testing

    Section 3 Troubleshooting and Testing Troubleshooting Guide When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which will be found in the “Test Procedure “section.
  • Page 19 Section 3 Troubleshooting and Testing HUMIDITY SENSOR...

  • Page 20: Test Procedures

    Section 3 Troubleshooting and Testing Test Procedures Procedure Letter Component Test MAGNETRON ASSEMBLY TEST WARNING High voltages are present during the cook cycle, so extreme caution should be observed. Discharge the high voltage capacitor before touching any oven components or wiring. 1.
  • Page 21 Section 3 Troubleshooting and Testing Procedure Component Test Letter POWER TRANSFORMER TEST WARNING Do not touch the components of the power transformer while power transformer is energized. It is dangerous because this has high voltage components. (High voltages are present at the high voltage terminal, so do not attempt to measure the f lament and high voltage.) 1.
  • Page 22 Section 3 Troubleshooting and Testing Procedure Component Test Letter HIGH VOLTAGE CAPACITOR TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. (See Warnings and Instructions on page 3-1) 4.
  • Page 23 Section 3 Troubleshooting and Testing Procedure Component Test Letter PRIMARY INTERLOCK SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. (See Warnings and Instructions on page 3-1) 4.
  • Page 24 Section 3 Troubleshooting and Testing Procedure Component Test Letter MONITOR SWITCH TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. (See Warnings and Instructions on page 3-1) 4.
  • Page 25 Section 3 Troubleshooting and Testing Procedure Component Test Letter HOOD FAN MOTOR TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. If the motor does not turn, touch the FAN button once and check voltage between pins “1” and “2”...
  • Page 26 Section 3 Troubleshooting and Testing Procedure Component Test Letter KEY UNIT NOTES: 1. Check key unit ribbon connection before replacement. 2. Reconnect all leads removed from components during testing. 3. Re-install the hood intake duct R with two (2) screws.1. Re-install the outer case (cabinet).
  • Page 27 Section 3 Troubleshooting and Testing Procedure Component Test Letter KEY UNIT TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. (See Warnings and Instructions on page 3-1) 4.

  • Page 28: Section 4 Component Teardown

    Section 4 Component Teardown WARNING To prevent an electric shock, take the following precautions: 1. Before wiring: A. Disconnect the power supply. B. Open the door and wedge the door open. C. Discharge the high voltage capacitor and wait for 60 seconds. 2.

  • Page 29: Hood Exhaust Louver Removal

    Section 4 Component Teardown Removal Of Oven From Wall NOTE The following adjustments or component replacement NOTE can be performed without removing the oven from the Two persons are recommended to remove the oven wall: from a wall installation. 1. Hood lamps, sockets, grease filter and charcoal filter. 2.

  • Page 30: Outer Case Removal

    Section 4 Component Teardown Outer Case Removal Power Transformer Removal Remove the oven from the wall and proceed as follows: REMOVAL 1. Disconnect the power supply cord. 1. Disconnect the power supply cord, remove oven 2. Open the door and block it open. from wall, then remove outer case.

  • Page 31: Capacitor Removal

    Section 4 Component Teardown High Voltage Diode And High Voltage Magnetron Removal Capacitor Removal 1. Disconnect the power supply cord, remove oven from wall, then remove outer case. 1. Disconnect the power supply cord, remove oven 2. Open the door and block it open. from wall, then remove outer case.

  • Page 32: Hood Fan Motor Removal

    Section 4 Component Teardown Hood Fan Motor Removal Cooling Fan Motor Removal 1. Disconnect the power supply cord, remove oven 1. Disconnect the power supply cord, remove oven from wall, then remove outer case. from wall, then remove outer case. 2.
  • Page 33 Section 4 Component Teardown Servicing The Touch Control Panel 4. Disconnect the leads to the primary of the power transformer. Precautions For Handling Electronic Components 5. Ensure that these leads remain isolated from other This unit uses CMOS Logic Unit in the integral part of the components and oven chassis by using insulation circuits.

  • Page 34: Turntable Motor And Food Lamp Sockets Removal

    Section 4 Component Teardown B. Servicing the touch control panel with power Turntable Motor And Food Lamp Sockets supply from an external power source: Removal Disconnect the touch control panel completely from the 1. Disconnect the power supply cord. oven proper, and short both ends of the door sensing 2.
  • Page 35 Section 4 Component Teardown Control Assembly And PCB Stirrer Motor Removal Removal 1. Disconnect the power supply cord, remove oven 1. Disconnect the power supply cord. from wall, then remove outer case. 2. Open the door and block it open. 2.

  • Page 36: Door Sensing Switch, Primary Interlock Switch And Monitor Switch Removal

    Section 4 Component Teardown Door Sensing Switch, Primary Interlock Door Sensing Switch, Primary Interlock Switch And Monitor Switch Removal Switch, And Monitor Switch Adjustment 1. Disconnect the power supply cord and remove outer case. 1. Disconnect the power supply cord, remove oven 2.

  • Page 37: Door Replacement

    Section 4 Component Teardown Door Replacement After adjustment, check the following. 1. In and out play of door remains less than 0.5mm REMOVAL when in the latched position. First check upper 1. Disconnect the power supply cord. position of latch hook, pushing and pulling upper 2.

  • Page 38: Door Disassembly

    Section 4 Component Teardown NOTE Upper Door Hinge Pin Hood Exhaust The door on a microwave oven is designed to act as an Louver electronic seal preventing leakage of microwave energy Upper Oven from oven cavity during cook cycle. This function Re-Install Hinge does not require that door be air-tight, moisture-tight...
  • Page 39 Section 4 Component Teardown Sensor Humidity and Stirrer Motor Removal CHOKE COVER 8. Insert a putty knife (thickness of about 0.5mm) 1. Disconnect the power supply cord, remove oven into the gap A between the choke cover and door from wall, then remove outer case. stopper and between the choke cover and the door 2.
  • Page 40 For authorized servicers, additional assistance is available by contacting our Technical Support Team at (800) 444-9091. Visit QuickFinder at http://portal.mch.bshg.com/portal. 583000001195114 ARA EN C JUNE 2016 Copyright by BSH Home Appliances Corporation 1901 Main Street, Suite 600, Irvine CA 92614 800 444-9091 This material is intended for the sole use of BSH authorized persons and may contain confidential and proprietary information.

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