Sanyo EM-D975 Service Manual
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Sanyo EM-D975 Service Manual

Sanyo EM-D975 Service Manual

Microwave oven
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Microwave Oven

EM-D975
MODEL:
Service Manual
REFERANCE NO. SM150008

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Summary of Contents for Sanyo EM-D975

  • Page 1: Microwave Oven

    Microwave Oven EM-D975 MODEL: Service Manual REFERANCE NO. SM150008...

  • Page 2: Table Of Contents

    THE CHARACTERS REQUIREMENTS OF MICROWAVE AFTER IT HAS BEEN REPAIRED..20 CRITICAL PARTS SERVICING ........................21 IMPORTANT THINGS TO DO PRIOR TO CRITICAL PARTS SERVICING: ........21 Interlock Assembly Replacement and Adjustment................21 COMMON BREAKDOWN OF MICROWAVE OVEN AND MEANS OF REPAIRING........22 EM-D975 explode drawing..........................23 EM-D975 Microwave Oven Parts List ......................24...

  • Page 3: Safety Precautions

    PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY Do not operate or allow the oven to be operated with the door open. 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 4: The Heating Principle Of Microwave

    Microwave is one kind of radio wave whose wavelength is very short, frequency is very high. Therefore, it is called ultrahigh frequency electromagnetic wave. Microwave can heat food mainly result in the mutual affect of the food in the microwave field and the microwave field itself. Under the affect of microwave field, the thermal effect mechanism produced from the mutual affect of the microwave and the food includes two aspects.

  • Page 5: The Structure And Working Principle Of Microwwave Oven

    K Stands for a constant E Stands for the microwave frequency. f Stands for the microwave frequency. Stands for loss angle tangent of the heated matter. Er Stands for relative dielectric constant of the heated matter. Microwave oven can be classified to many kinds according to various construction, volume and control function.

  • Page 6: Cooling System

    Microwave generator is the heart of microwave oven. The quality of a microwave oven mostly depends on the quality of the microwave generator. A microwave generator is mainly composed of magnetron and its power supply circuit, FIG.2-3 is the typical circuit diagram of the present used microwave oven’s generator. The power supply circuit is composed of rectifying circuit and filament circuit.
  • Page 7 Drawing 2-5(a) is the circuit and construction diagram fuse main latch switch of the door interlock switch of brand, EM-D975 microwave oven. It mainly consists of latch switch (S1, S2), pilot switch (S3), door hook and starting mechanism of the door interlock switch.
  • Page 8 conduction ratio control. This oven adopt time and power controller as a whole. When a 230V, 50Hz alternating current is inputted, the time and power motor is always at working condition. At the FIG.2-7, S5 is always conducted. Made the S5 working 30 seconds as a circle, the conduct time can be successively adjusted from 5 seconds to 30 seconds.

  • Page 9: Typical Circuit Analyasis Of Microwave Oven

    8). It is the most liable place where microwave leakage occurs. Especially, after a long time using, the microwave leakage would enlarge at the hinge and the hook. Anyway, mechanic damage would also cause large amount of microwave leakage. Therefore, the main methods designed for preventing microwave leakage of the door are as follows: 1) Assemble a layer of steel filament or a thin metal plate with many holes at the middle of the window to made it is possible to observe the heating as well as shielding the microwave.

  • Page 10: How To Assemble And Disassemble Microwave Oven Components

    circuit is closed, so the control board can function now. When cooking, touch the starting switch to power the timer and the power relay. RY1, RY2 closed the power supply to the anode of the magnetron and the filament, changing the power frequency electric energy to microwave energy, the microwave energy then transferred to the heating chamber for food heating.

  • Page 11: The Door Combination

    six-angle screw To disassemble, Pull out the power plug. Take off the cabinet. hinge(up) Loosen the two six –angle screws of left hinge (up) with a socket wrench (FIG.4 - 2). oven Push the door release button to have the hook out (FIG.4 -3).

  • Page 12: The Control Panel And The Door Release Mechanism

    FIG.4 – 1. Tear off the adhesive protective paper of the lining and stick it on the door as FIG.4 – 1, slip the hook on the doorframe, and fix the doorframe on the door, tighten it with “+” – screws. After assembled, check whether the hook working in normal and whether the hinge (UP) is its position.

  • Page 13: The Transformer

    magnetron vertically, and also tighten the screws of the lampshade (FIG.4 - 8). Plug in the two terminals of the magnetron filament and the thermal cutout. Firstly, do as the 1,2,3, steps at of this part. Dismantling steps for the transformer: (as FIG.4 -9). Pull out all the terminal of the transformer.

  • Page 14: The Capacitor

    Assemble the fan motor as FIG.4 – 14. Drip the glue on the “ place of the fan motor shaft, and fix the fan on the earthing screw motor, make sure it must be fixed to the bottom of the shaft.

  • Page 15: The Turntable Combinatiom

    Insert one end of the diode to one feet of the capacitor’s connect piece. Fix the diode with one screw (pay attention to the polarity of the diode, refer to FIG.4 - 16). Firstly, do as the 1, 2, 3, stops of of this part.

  • Page 16: The Control Panel Of A Typical Microwave Oven

    (2) Assemble the interlock switch and pilot switch to the switch holder, make sure they are assembled correctly. (3) Tightly fix the holder with two screws. (4) Check the position of the hook and the switch holder. screw Close the door, push and pull the low and up part of the latch switch hold door to check whether the door is flexible.

  • Page 17: Breakdown Analysis And The Means Of Overhauling

    Before overhauling a microwave oven, you should judge the breakdown and the cause correctly, then you can repair it with corresponding ways. The overhauling must be proceed in order, any hasty conclusion is not recommendable, otherwise over-working would be done when repair. The microwave oven may occur compound breakdown due to all kinds of different reasons, thus, when overhaul, they all should be taken into consideration.
  • Page 18 around the door crack, those hole position of the window and the air vent at four sides of the oven with the probe of the measure. When measure, the moving speed of the probe should not exceed 25mm per second, and the measuring direction should be the same with the outing direction of the probe should not exceed 25mm per second, and the measuring direction should be the same with the outing direction of the microwave leakage (FIG.5 - 2)..

  • Page 19: Repairing Method Of Several Breakdown

    Pull out the power plug, take off the cabinet, discharge the capacitor, measure the resistance value of the primary winding and the secondary winding of the transformer with an avometer (FIG.5 – 10 and FIG.5 - 9). The resistance value of the primary winding should be about 2.2 ohms, the secondary winding should be about 130 ohms.
  • Page 20 leaking. Following mentioned may be the main causes of microwave leakage: (1) The door deformed, the hinge loosed or damaged that caused the door can not close tightly. (2) The door pressing cover or the embed piece damaged or come off. (3) Obvious damage or uneven of the oven.

  • Page 21: The Characters Requirements Of Microwave After It Has Been Repaired

    replaced with a new door. 2. Means of repair when the oven can heat, but the turntable glass can’t move Firstly, check whether the turntable holder is placed correctly. If it is correct, then pull out the power plug and take down the turntable combination, measure the resistance value of the turntable motor R×1K grade of a avometer.

  • Page 22: Critical Parts Servicing

    voltage is less than 230V. If the voltage below 230V but the water can be boiled after a little more time beating, it is normal. Place a graduate of about 200ml water on the turntable glass tray of the oven, power set middle, time set 4 minutes to make the oven operating in normal.

  • Page 23: Common Breakdown Of Microwave Oven And Means Of Repairing

    PHENOMENON CAUSE REPAIRING MEANS 8A fuse broken. Change a new fuse. The primary and secondary winding of the Change a new transformer. transformer are short – circuited. Change a new capacitor. When starting The earthing or the polarity of the polarity of Change a new pilot switch.

  • Page 24: Em-D975 Explode Drawing

    After long time using, the wear and the rust –eaten enlarged the gap of the door shaft Adjust the hinge to rectify the and the shaft hole, thus cause the door position of the door. 9. The door can’t open crooked.

  • Page 25: Em-D975 Microwave Oven Parts List

    PART CODE NO. NAME PART CODE NO. NAME PART NO. PART NO. GA-D900L30RP01 Oven cavity GA-D900L30RP47 Driving fan blade GA-D900L30RP02 Door GA-D900L30RP48 Driving wheel GA-D900L30RP03 Door window Rotational axis GA-D900L30RP49 GA-D900L30RP04 Door frame bracket (upper) GA-D900L30RP05 screw GA-D900L30RP50 label GA-D900L30RP06 Choke cover GA-D900L30RP51 Rotational axis GA-D900L30RP07 Heat resistant glass Rotational axis...
  • Page 26 GA-D900L30RB04 Owner's manual GA-D900L30RB05 Plastic film GA-D900L30PB06 Plastic bag GA-D900L30RB07 Foam cushion GA-D900L30RB08 Plastic bag GA-D900L30RB09 Packing belt GA-D900L30RB10 Carton GA-D900L30RB11 Wrapping nail EM-D975 Microwave Oven Components List PART NO. PART CODE NO. NAME Fan motor GA-D900L30RC01 H.V.capacitor GA-D900L30RC02 H.V.diode...
  • Page 27 fuse GA-D900L30RC16 thermostat GA-D900L30RC17 Convection motor GA-D900L30RC18 temperature sensor GA-D900L30RC19 GA-D900L30RC20 wave filter Heater of grill GA-D900L30RC21...

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