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Summary of Contents for Kleenmaid MWG4511
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Page 1: Microwave Oven
MICROWAVE OVEN SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT，READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Cover Page... -
Page 2: Table Of Contents
REPAIR INSTRUCTION Removing High-voltage Capacitor and Diode ··················· 1 SAFETY·································································2 3.10 Removing Air guide Assembly··········································· 11 Danger ·················································································2 3.11 Removing Magnetron ·· ·· · ··· ··············································· 12 Caution!················································································2 3.12 Removing Pcb Assembly··················································· 12 Leak test (leak detection measurement) ·······························3 3.13 Removing Turntable Motor ··... -
Page 3: Safety
SAFETY Danger Caution! Repairs may be carried out by an electrician only! Always comply with the following instructions to prevent damage to the appliance or to components: Improper repairs may endanger and injure the user! To prevent electric shocks, always comply with the following •... -
Page 4: Leak Test (Leak Detection Measurement)
Leak test (leak detection measurement) Leak test (leak detection measurement) The leak rate is the microwave energy which escapes despite the The leak rate is the microwave energy which escapes despite the 1.3.2 Abnormal operation (no-load operation) intact sealing systems. intact sealing systems. -
Page 5: Components
COMPONENTS High-voltage diode Set to insulation resistance. 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 • Heater voltage approx. 3.3 V approx. 3.3V • Operating voltage approx. 2300 V The operating voltage cannot be measured!! Primary side 230V of input voltage... -
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
Safety switches Microwave ovens usually feature at least three safety switches. 2.5.1 Switching sequence These switches are supported by the switch brackets. Each door switch independently switches off the power supply for the The basic function of these switches is to interrupt microwave microwave oven when the door is opened. -
Page 10: Repair
REPAIR Discharge the high-voltage capacitor before testing! Caution!: Removing Under Air Guide Removing Trim Assembly 1. Open the door, remove the Screw B from the installation hole. 1. Remove the screws holding the under Air Guide to Cavity Assembly. 2. Pull the Microwave oven out. 3. -
Page 11: Removing Outer Case
Removing Door Assembly Removing Outer Case 1. Disconnect the power supply cord from the outlet. 1. Open the door. 2. Remove the screws from the rear and along side edges of the 2. Remove two screws holding the Hinge to the cavity Assembly. case. -
Page 12: Removing High-Voltage Transformer
Removing High Voltage Transformer 3. 9 Removing High-Voltage Capacitor and Diode 1. Discharge the high voltage capacitor. 1. Discharge the high voltage capacitor. 2. Disconnect the leadwire from magnetron, high voltage transformer, 2. Disconnect the leadwire from fan motor, noise filter and high voltage and capacitor. -
Page 13: Removing Magnetron
3.11 Removing Magnetron 3.12 Removing PC B Assembly 1. Remove the control panel assembly from the cavity. 1. Disconnect the leadwire from the high voltage transformer and control panel. 2. Remove the screws which hold the PCB to the high voltage capacitor. 3. - Page 14 3. 1 Removing Turntable Motor 1. Remove the glass tray. 2. Remove the pully shaft VERY CAREFULLY. 3. Lay the unite down on its back. 4. Remove the turntable motor cover. The turbtable base cover is easily removed by pinching the six parts with a wire cutting.
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Page 15: Fault Diagnostics
FAULT DIAGNOSTICS Troubleshooting plan - when getting a complaint When you get a complaint from your customer, evaluate the complaint carefully. If the following sysmptoms apply, please instruct the customer in the proper use of the microwave oven. This can eliminate an unnecessary service call. CAUTIONS 1. - Page 16 Troubleshooting plan - when getting a complaint CONDITION CAUSE REMEDY Microwave oven Avoid using other electrical Inserting many plug into one does not work. appliances when you use the plug outlet and using microwave oven. them at the same time (causes overloading).
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Page 17: Troubleshooting Plan - Probable Defective Control Circuit
Troubleshooting plan - Probable defective control circuit The following visual conditions indicate a probable defective control circuit. CONDITION CHECK RESULT CAUSE REMEDY 1. No input can be Defective PCB Replace PCB Check the conn- Continuity. programmed. assembly. assembly. ection between membrane key Loose Connect them... - Page 18 Troubleshooting plan - Oven does not operate at all Oven does not operate at all, display window does not display any figures and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Replace primary Malfunction of the Check continuity 1. Fuse blows. Continuity.
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Page 19: Troubleshooting Plan - Oven Does Not Operate At All
Troubleshooting plan - Oven does not operate at all CONDITION CHECK RESULT CAUSE REMEDY Check continuity Defective Replace No continuity. 2. Fuse does not of oven oven thermostat. oven thermostat. blow. thermostat. Continuity. Check continuity Defective mag- Replace mag- No continuity. of magnetron netron thermostat. - Page 20 4.4 Troubleshooting plan - Oven does not start cooking Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Replace Defective Check continuity 1.Setting time does No continuity.
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Page 21: 4.5 Troubleshooting Plan - Output Power Is Low
4.5 Troubleshooting plan - Output power is low Oven seems to be operation but output is low. CONDITION CHECK RESULT CAUSE REMEDY Check the Lower than 90% of Decrease in power Suggest customer Output is low. rating voltage. power source source voltage contact local voltage. -
Page 22: Troubleshooting Plan - Oven Does Not Cook Properly
Troubleshooting plan - Oven does not cook properly Oven does not cook properly when programmed for the set power level (Operates properly in HIGH) CONDITION CHECK RESULT CAUSE REMEDY Defective P.C.B. Replace P.C.B. Output is full when Disconnect the Abnormal. assembly. -
Page 23: Troubleshooting Plan - Grill
Troubleshooting plan - Grill REMEDY CONDITION CHECK RESULT CAUSE 1. Heater is not Malfunction the Heater. Abnormal. Replace. operating. heater. Normal. Thermostat and Malfunction the Abnormal. Replace. heater relay(Grill) thermostat. Normal. Replace or Wire connection. No continuity. Open or loosen. connect tightly.
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