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  • Page 1 Model: PM14011...

  • Page 2: Table Of Contents

    INTRODUCTION This Microwave Oven Service Manual is printed in a loose-leaf format. Each part is divided into sections relating to a general group of components and each section is subdivided into various parts describing a particular component or service procedure. The subdividing of the subject matter plus the loose leaf form will facilitate the updating of the manual as new or revised components and service procedures are introduced.

  • Page 3: Safety Precautions

    PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY A. Do not operate or allow the oven to be operated with the door open. B. 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. tgδ 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, EMN-109 microwave oven. It mainly consists of latch switch (S1, S2), pilot switch (S3), door hook and starting mechanism of the door interlock switch. There fixed hooks on the oven door, and opened two pilot switch rectangle hole at the corresponding place at the right of...
  • Page 8 conduction ratio control. This oven adopt time and power controller as a whole. When a 120V, 60Hz 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

    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. 2) The widely used seal measurement at present is to assemble a current –...

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

    time, the lamp turned on, the fan motor begins to cool the magnetron. The turntable motor set off to drive the food around and making the food heated evenly. The microcomputer begins reckon the time, when it reached the sets time, power relay are cut off, the power of the lamp, all the motor and the magnetron are cut off, the food –...

  • Page 11: The Door Combination

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

    Aim the head of the magnetron antenna to the hole of the wave guide housing, tighten the four screws of the 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 Ⅲ...

  • Page 14: The Capacitor

    to mount the fan motor, 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

    To assemble, 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 Ⅲ of this part. To disassemble, Turn the microwave oven over (FIG.

  • 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 door to check whether the door is flexible.

  • Page 17: Breakdown Analysis And The Means Of Overhauling

    (6) Fix the control panel on the oven (FIG.4-6). (7) Plug in the terminal plugs of the PC board. 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.
  • Page 18 the microwave leakage measure, measure 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...
  • Page 19 whether the terminal plug of the magnetron and the capacitor have loosened, if it is loosened, pinch it tightly with a pliers. 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 –...

  • Page 20: Repairing Method Of Several Breakdown

    model one. 1. Repair when there occurred large amounts microwave leakage. There are many factors which may cause microwave 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.

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

    copper filament weaved washer must be placed well, the screws must be twist tightly. Then turn on the oven and measure again until it comply with the requirement. If the microwave leakage is larger at those hole position of the window board. The oven should be turned off to inspect whether there are crack among them (fig.5 - 16). If several holes formed a crack, it would enlarge the microwave leakage.

  • Page 22: Critical Parts Servicing

    Place a graduate of about 250ml water on the turntable tray. Close the door, power set high, time set 4 minutes (To those 700W microwave oven) to make the oven operating in normal. When the bell of the timer rings, open the oven door, the water should have boiled.

  • 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 too thin cause the wave guide opening not Thick the copper filament in good earth. washer 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.

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