Bosch HMC80151UC Service Manual Download | Manualshive

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4.2 Troubleshooting plan - appliance does not function at all

58300000178640_ARA_EN_B

1901 Main St. Irvine, CA. 92614

800-444-9091

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Summary of Contents for HMC80151UC

Page 1: ...is 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 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 for...

Page 2: ...ating elements 13 Removing the hot air motor 14 Removing the magnetron 15 FAULT DIAGNOSTICS 16 Troubleshooting plan fuse is tripping 16 Troubleshooting plan appliance does not function at all 17 Troubleshooting plan appliance does not start 18 Troubleshooting plan no microwave power 19 Troubleshooting plan input module 20 Troubleshooting plan Error Codes of input module 22 Determining the microwav...

Page 3: ...andard values This connection is extremely important for personal safety and function of the appliance When repairs are complete conduct a test in accordance with VDE 0701 or national regulations When repairs are complete conduct a function test When repairs are complete conduct a leak rate test 1 2 Caution Always comply with the following instructions to prevent damage to the appliance or to comp...

Page 4: ...onditions have been specified in the VDE regulation 0700 Part 25 and are as follows The limiting values for the permitted measured values as well as the measurement conditions have been specified in the VDE regulation 0700 Part 25 and are as follows 1 3 1 Normal operation with load 1 3 1 Normal operation with load Setting maximum power setting of the appliance Setting maximum power setting of the ...

Page 5: ...te 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 58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

Page 6: ...y 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 58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

Page 7: ...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 of approx 3 3V Primary side 230V of input voltage 58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

Page 8: ...n EHG tester Note An internal flashover short circuit between cathode and anode cannot usually be established by taking a measurement This is not indicated until the appliance is switched on when high voltage is applied to the magnetron It may also be possible to detect the fault by loud humming noises Before installing the magnetron ensure that the metal seal is ok and is seated correctly 5830000...

Page 9: ...o interrupt microwave generation as soon as the door is opened One of the three switches is the short circuit switch It monitors one of the two other switches and actuates the appliance safety device if the monitored switch does not function Switching sequence Open door Close door 1 Safety switch on right Short circuit switch 2 Safety switch on left Safety switch on left 3 Short circuit switch Saf...

Page 10: ...nto the recesses in front of the hinges Part 10000699 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 58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

Page 11: ...V 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 58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

Page 12: ...the cover from the turntable motor This cover has been punched into the base plate It can easily be removed with side cutters 5 Disconnect the turntable motor 6 Remove the screws which attach the turntable motor to the cooking compartment 7 After repairing or replacing the motor screw the cover to the base plate with a screw 58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

Page 13: ...citor 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 58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

Page 14: ...etron and H V transformer 6 Disconnect the wiring above the upper heat protector assembly 7 Unscrew the upper heat protector assembly from the cavity upper plate and lift out carefully 7 Disconnect the heating elements 8 Remove the hex nuts on the right side of cavity and on the upper of cavity 9 Lift out the upper heating elements from the cavity 58300000178640_ARA_EN_B 1901 Main St Irvine CA 926...

Page 15: ...Disconnect the Hot air motor 8 Remove the hex nut which attaches the inner fan blade to the shaft of the hot air motor 9 Pull out the inner fan blade in the hot air chamber 10 Unscrew the hot air motor bracket 11 Lift out the hot air motor with the bracket and remove the outer fan blade 12 Unscrew the hot air fan motor from the hot air motor bracket 58300000178640_ARA_EN_B 1901 Main St Irvine CA 9...

Page 16: ...etron 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 Also ensure that there is no gap between the hollow conductor and magnetron 58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

Page 17: ...4 4 1 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 58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

Page 18: ...4 2 Troubleshooting plan appliance does not function at all 58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

Page 19: ...4 3 Troubleshooting plan appliance does not start 58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

Page 20: ...4 4 Troubleshooting plan no microwave power 58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

Page 21: ...ayed numerals 4 One or more displayed characters do not illuminate 5 Display does not count down while the time is flashing or does not increase in clock mode 6 Time display jumps visibly during the countdown 7 Display counts down too quickly during the cooking process 8 None of the display symbols is indicated after the cooking cycle has been selected 9 Time is no longer displayed at the end of t...

Page 22: ...58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

Page 23: ...g in mode Display the error code for 3 seconds E 2 Safety time Safety time was reached oven is in off condition until push any button disappear E2 E 3 Damper function failed Will detect only after plug in and will disappear after push any button E 4 Thermistor short If detected revert to plug in mode Display the error code for 3 seconds E17 Preheat fail If detected revert to clock mode Display the...

Page 24: ...crowave proof utensils each with a capacity of 1 l 1 thermometer with immersion sensor Proceed as follows 1 Determine the initial temperature mean value 2 2 min cooking time at max power 3 Determine end temperature mean value 4 Calculate temperature difference 5 Calculate output power 58300000178640_ARA_EN_B 1901 Main St Irvine CA 92614 800 444 9091 ...

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