Bosch HMC54151UC/01 Service Manual
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Bosch HMC54151UC/01 Service Manual

Speed microwave ovens
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S
M
ERVICE
ANUAL
for
This manual contains information that is necessary for
servicing the following Bosch Speed Microwave Ovens:
HMC54151UC
This manual is designed to be used by qualified service
Speed Microwave Ovens
personnel only. Due to the complexity and the risk of
high-voltage electrical shock, Bosch does not
recommend that customers service their own units.
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.
HMC54151UC

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Summary of Contents for Bosch HMC54151UC/01

  • Page 1 ERVICE ANUAL This manual contains information that is necessary for servicing the following Bosch Speed Microwave Ovens: HMC54151UC This manual is designed to be used by qualified service Speed Microwave Ovens personnel only. Due to the complexity and the risk of high-voltage electrical shock, Bosch does not recommend that customers service their own units.

  • Page 2: Table Of Contents

    REPAIR INSTRUCTION 1 SAFETY·································································2 FAULT DIAGNOSTICS······································· 16 Danger ·················································································2 Troubleshooting plan - fuse is tripping································ 16 Caution!················································································2 Troubleshooting plan - appliance does not function at all ··· 17 Leak test (leak detection measurement) ·······························3 Troubleshooting plan - appliance does not start ················· 18 Troubleshooting plan - no microwave power ······················...

  • Page 3: Safety

    Caution! SAFETY Danger Always comply with the following instructions to prevent damage to the appliance or to components: Repairs may be carried out by an electrician only! • Comply with ESD instructions! Improper repairs may endanger and injure the user! •...

  • Page 4: Leak Test (Leak Detection Measurement)

    Leak test (leak detection measurement) Leak test (leak detection measurement) 1.3.2 Abnormal operation (no-load operation) Setting: maximum power setting of the appliance The leak rate is the microwave energy which escapes despite the The leak rate is the microwave energy which escapes despite the Load: none (no-load operation) intact sealing systems.

  • Page 5: Components

    Set to insulation resistance. COMPONENTS High-voltage diode Blocking direction = infinite. The high-voltage diode can be tested like a standard diode. Use an EHG tester for this. • Full continuity in conducting direction. • Infinite in blocking direction. Set to insulation resistance. Conducting direction = full continuity.

  • Page 6: High-Voltage Capacitor

    High-voltage capacitor The high-voltage capacitor can be tested by ‘ohmic’ measurement’ (resistance measurement range 20 ΜΩ). A correctly functioning capacitor indicates transient continuity. The resistance then increases proportionally with the load. A defective capacitor (e.g. short-circuit) indicates permanent continuity. The measuring instrument must indicate infinitely between the connection and housing.

  • Page 7: High-Voltage Transformer

    High-voltage transformer This transformer supplies the heater voltage for the magnetron and the operating voltage for doubling the voltage. • Input voltage 230 V • Heater voltage approx. 3.3 V • Operating voltage approx. 2300 V The operating voltage cannot be measured!! Heater voltage approx.

  • Page 8: Magnetron

    Magnetron The magnetron can be tested by ‘ohmic’ measurement´ only. The volume resistance of the terminals F and FA should be less than 1 Ω. The insulation resistance between the two terminals and the housing should be infinite. Measure the resistance with an EHG tester. Note: An internal flashover (short-circuit between cathode and anode) cannot usually be established by taking a measurement.

  • Page 9: Safety Switches

    4.5.1 Switching sequence Safety switches Each door switch independently switches off the power supply for the microwave oven when the door is opened. Microwave ovens usually feature at least three safety switches. The switching sequence is specified by the arrangement and is as These switches are supported by the switch brackets.

  • Page 10: Repair

    REPAIR Removing the door 1. Open the door and insert the "HOLDERS" into the recesses in front of the hinges. 2. Carefully close the door and lift out of the hinge thrust bearings. NOTE: After re-installing the door, ensure that the safety switches function normally.

  • Page 11: Removing The Bottom Heating System

    Removing the bottom heating system 1. Remove the housing. 2. Discharge the HV capacitor. 3. Take the turntable out of the appliance. 4. Disconnect the heating system. 5. Unscrew the heating system on the bottom and right. 6. Slide the heating system to the right and then lift out of the appliance.

  • Page 12: Removing The Turntable Motor

    Removing the turntable motor 1. Take the metal plate out of the appliance. 2. VERY CAREFULLY prise out the turntable shaft with a flat screwdriver. 3. Place the appliance on its back. 4. Remove the cover from the turntable motor. This cover has been punched into the base plate.

  • Page 13: Removing The Cooling Fan

    Removing the cooling fan 1. Remove the housing. 2. Discharge the HV capacitor. 3. Unscrew the H.V. diode. 4. Disconnect the magnetron. 5. Disconnect the fan motor. 6. Unscrew and remove the cooling fan assembly. 7. Unscrew the fan retaining plate and remove in the direction of the structure.

  • Page 14: Removing The Upper Heating Elements

    Removing the upper heating elements 1. Remove the housing. 2. Discharge the HV capacitor. 3. Unscrew the cooling fan assembly, and lift out. 4. Disconnect the magnetron and the H.V. transformer. 5. Unscrew and remove magnetron and H.V. transformer. 6. Disconnect the wiring above the upper heat protector assembly. 7.

  • Page 15: Removing The Hot Air Motor

    Removing the hot air motor 1. Remove the housing. 2. Discharge the HV capacitor. 3. Remove the rear cover. 4. Disconnect the Hot air assembly. 5. Remove oven sensor. 6. Unscrew the Hot air assembly and lift out carefully. 7. Disconnect the Hot air motor. 8.

  • Page 16: Removing The Magnetron

    Removing the magnetron 1. Remove the housing. 2. Discharge the HV capacitor. 3. Remove the magnetron TCO. 4. Disconnect the magnetron. 5. Remove the left air guide. 6. Unscrew the magnetron. NOTE: When re-installing the magnetron, ensure that the fastening screws are tightened to prevent microwave energy from escaping.

  • Page 17: Fault Diagnostics

    FAULT DIAGNOSTICS Troubleshooting plan - fuse is tripping The appliance does not function at all; there are no symbols/numerals on the display and no inputs are accepted. Page 16 of 23 pages ______________________________________________________________________________________________________________________________________________________________________________ Copyright by BSH Home Appliances Corporation 1901 Main Street, Suite 600, Irvine CA 92614 700_ 58300000192890_ARA_EN_A 800 444-9091 This material is intended for the sole use of BSH authorized persons and may contain confidential and proprietary information.

  • Page 18: Troubleshooting Plan - Appliance Does Not Function At All

    Troubleshooting plan - appliance does not function at all Page 17 of 23 pages ______________________________________________________________________________________________________________________________________________________________________________ Copyright by BSH Home Appliances Corporation 1901 Main Street, Suite 600, Irvine CA 92614 700_ 58300000192890_ARA_EN_A 800 444-9091 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.

  • Page 19: Troubleshooting Plan - Appliance Does Not Start

    Troubleshooting plan - appliance does not start Page 18 of 23 pages ______________________________________________________________________________________________________________________________________________________________________________ Copyright by BSH Home Appliances Corporation 1901 Main Street, Suite 600, Irvine CA 92614 700_ 58300000192890_ARA_EN_A 800 444-9091 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.

  • Page 20: Troubleshooting Plan - No Microwave Power

    Troubleshooting plan - no microwave power Page 19 of 23 pages ______________________________________________________________________________________________________________________________________________________________________________ Copyright by BSH Home Appliances Corporation 1901 Main Street, Suite 600, Irvine CA 92614 700_ 58300000192890_ARA_EN_A 800 444-9091 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.

  • Page 21: Troubleshooting Plan - Input Module

    Troubleshooting plan - input module The following statuses indicate a potentially defective input module. 1. Display segments incomplete. • Segment is missing. • Partial segment is missing. • Character is flickering (note: slight flickering is normal). 2. Comma/decimal point is not displayed or is flashing. 3.
  • Page 22 Page 21 of 23 pages ______________________________________________________________________________________________________________________________________________________________________________ Copyright by BSH Home Appliances Corporation 1901 Main Street, Suite 600, Irvine CA 92614 700_ 58300000192890_ARA_EN_A 800 444-9091 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.

  • Page 23: Troubleshooting Plan - Error Codes Of Input Module

    Troubleshooting plan - Erro r Codes of input module. Error Codes Explaination Error Codes Problems Thermistor open E 1: Safety time E 2: Damper function failed E 3: Thermistor short E 4 : Preheat fail (not reached target temperature within 15min). E17 : E 1: Thermistor open: If detected, revert to plug in mode (Display the error code for 3 seconds).

  • Page 24: Determining The Microwave Output Power

    Determining the microwave output power The output power P is determined by heating a specific volume of water (cold tap water). Required aids: • 2 microwave-proof utensils, each with a capacity of 1 l. • 1 thermometer with immersion sensor. Proceed as follows: 1.

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