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EM-W3000W

Microwave Oven

Service Manual

REFERENCE NO. SM-GA0005

Содержание EM-W3000W

Страница 1: ...EM W3000W Microwave Oven Service Manual REFERENCE NO SM GA0005 ...

Страница 2: ...s List 4 1 THE HEATING PRINCIPLE OF MICROWAVE 5 2 THE STRUCTURE AND WORKING PRINCIPLE OF MICROWWAVE OVEN 6 2 1 HIGH VOLTAGE RECTIFYING CIRCUIT 6 2 2 MICROWAVE GENERATER 7 2 3 COOLING SYSTEM 7 2 4 ELECTRIC CONTROL SYSTEM 7 3 TYPICAL CIRCUIT ANALYASIS OF MICROWAVE OVEN 10 4 HOW TO ASSEMBLE AND DISASSEMBLE MICROWAVE OVEN COMPONENTS 11 4 1 THE CABINET 11 4 2 THE DOOR COMBINATION 12 4 3 THE CONTROL PAN...

Страница 3: ...ave guide or transmission line and cavity for proper alignment integrity and connections D Any defective or misaligned components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is released to the owner E A microwave leakage check to verify compliance with the Federal ...

Страница 4: ...3 E EM M W W3 30 00 00 0W W M Mi ic cr ro ow wa av ve e O Ov ve en n E Ex xp pl lo od de e D Dr ra aw wi in ng g ...

Страница 5: ... 1 P15 GA 1000AP30P15 Shock proof rubber 2 B01 GA 1000AP30B01 Foam cushion 2 P16 GA 1000AP30P16 Air duct 1 B02 GA 1000AP30B02 Foam cushion 2 P17 GA 1000AP30P17 Wind baffle 1 B03 GA 1000AP30B03 Owner s manual 1 P18 GA 1000AP30P18 Bracket 1 B04 GA 1000AP30B04 Plastic bag 1 P19 GA 1000AP30P19 Fan blade 1 B05 GA 1000AP30B05 Plastic film 1 P20 GA 1000AP30P20 Fan shroud 1 B06 GA 1000AP30B06 Foam cushion...

Страница 6: ...es per second so do the molecule This kind of molecule swaying producing similar frictional heat from the interference and block of the action strength among the molecule and changed to microscopic microwave heating Microwave heating not only concerned the nature of the matter itself but also closely connected with the electric strength and frequency When the frequency is low the molecule swaying ...

Страница 7: ...ng steadily from a too high temperature If something wrong with the cooling system cause the temperature too high the control system would cut off the power automatically to prevent microwave generator being damaged form the high temperature Now we d like to introduce the working principle of each part of the widely used model mechanical control and touch control microwave oven 2 2 1 1 H HI IG GH ...

Страница 8: ...ld attached to the surface of the anode and would be harmful to the anode In order to reduce the surge voltage the filament of the magnetron must be connected as the FIG 2 3 shown In this figure when the anode current of the magnetron circulates the filament current should flow to the FA end from the lower end 2 2 3 3 C CO OO OL LI IN NG G S SY YS ST TE EM M In the working process of the microwave...

Страница 9: ...he microwave oven would stop operating immediately Provided due to some man made or the appliance itself reasons when the door is open and the safety interlock switches S1 S2 are not automatically cut off due to the existence of the monitor switch S3 which is still at conducted condition the monitor switch would immediately make the 120V voltage short circuited and blow up the fuse and will never ...

Страница 10: ...rowave theory it is a microwave resonant cavity that can contain many kinds of oscillating models simultaneously Microwave enters into the oven cavity through the wave guide and the coupling appliance and most of its energy is absorbed by the food after it is reflected in the cavity repeatedly those which haven t been absorbed will be reflect to the magnetron A good designed oven cavity should hav...

Страница 11: ... FOURTHWAVE LENGTH IMPEDANCE CHANGER Although there is no connecting point from a mechanical point It is sealed at the seam from the point of electricity so it is called CURRENT RESISTANT Recently with the installation of noise filter in the current resistant trough the effect to restrain the microwave leakage include high subharmonic have been much improved 3 3 T TY YP PI IC CA AL L C CI IR RC CU...

Страница 12: ...rmal cutout S6 S6 will be cut off immediately to cut off the power supply to the magnetron and the magnetron will stops working right away The PC board is cut off to prevent the magnetron from being damaged by overheating When the thermal cutout is cut off the magnetron motors and the lamp would stop working simultaneously Moreover the thermal cutout has the self resuming character when the temper...

Страница 13: ...the doorframe from the doorplate FIG 4 2 10 Take off the hook spring with a pointed plier then the hook combination 11 Clamp the window plate with hand push it down according to the arrow direction and take it off To assemble the door combination see sketch 4 2 to 4 5 1 Apply proper silicon grease or lubricating grease on the mark of the hook first then fix the hook on the oven door and the spring...

Страница 14: ...isassemble 1 Pull out the terminal plug of the time and power distributor 2 Take off the screw which fix the control panel with a screwdriver FIG 4 6 3 Take off the control panel To assemble 1 Place the two buckles under the control panel into the two rectangle holes under the oven as FIG 4 6 then make close of the control panel and the oven with being fixed with a screw Plug in the terminal plug ...

Страница 15: ...ure Then put on the seat and the right base board make sure the screw hole are tallied then tighten the four screws for the high voltage winding is earthing here 2 Fix the transformer on the oven as FIG 4 10 tear off the protect paper of the rubber spacer set it between the transformer and the oven make sure the adhesive side is sticked on the oven 3 Plug in all the terminals of the transformer pr...

Страница 16: ...1 and FIG 4 12 4 4 7 7 T TH HE E C CA AP PA AC CI IT TO OR R Firstly do as the 1 2 3 steps of Ⅲ of this part To disassemble 1 Pull the wires of the capacitor out 4 15 2 Loosen and take out the screw which fix the capacitor clip with a screwdriver and take out the clip and the capacitor 4 15 To assemble 1 Place the capacitor in the capacitor clip with the end which have three foot near the diode 4 ...

Страница 17: ...n back 5 As the FIG 4 19 shown fix in the turntable shaft supporter the place in the roller ring and the glass tray as FIG 4 20 4 4 1 10 0 T TH HE E D DO OO OR R S SA AF FT TY Y I IN NT TE ER RL LO OC CK KS S Firstly do as the same with 1 2 3 steps of Ⅲ of this part Steps for dismantling 1 Pull out the terminal plugs of the interlock switch and the pilot switch 2 Loosen out the two screws which fi...

Страница 18: ... terminal plug of the PC board 2 Loosen out the two screws which fix the control panel with a screwdriver FIG 4 6 3 Take off the control panel 4 Take off the three screws which fix the PC board as the FIG 4 22 5 Take off the range terminal plugs as FIG 4 24 shown that is press the two places according to the arrow direction at the figure while pull it up about 2mm then off the row plastic board 6 ...

Страница 19: ... like Pipa pipa 5 5 2 2 S SP PO OT T E EX XA AM MI IN NI IN NG G S ST TE EP PS S O OF F T TH HE E M MI IC CR RO OW WA AV VE E O OV VE EN N 5 5 2 2 1 1 E EX XA AM MI IN NE E T TH HE E M MI IC CR RO OW WA AV VE E I IN NS SU UL LA AT TI IN NG G R RE ES SI IS ST TA AN NC CE E Measure the insulating resistance with a avometer or a megaohmmeter the value should not be less than 2 megaohms Otherwise part...

Страница 20: ...t 3 4V FIG 5 5 If there is no voltage at all it indicates the transformer has broken and should be replaced by a new one If it is enough to 3 4V check the filament resistance of the magnetron measure the filament plug with the R 1 grade of a avometer FIG 5 6 If it is open circuited it indicates the magnetron has broken and should be replaced by a new one It is normal if the resistance very small T...

Страница 21: ...ero to nine megaohms it indicates the high voltage capacitor has broken and should be replaced by a new one If it is normal between the two pole of the capacitor then the insulation between the capacitor pole and the cabinet should be measured with R 10K grade of an avometer The resistance value should be FIG 5 12 If it is short circuited or have a number reading it indicates that the capacitor ha...

Страница 22: ...e oven then adjust the upper screw as FIG 5 15 Loosen out the screw push the door close to the oven to hook the door hook with the plastic parts then tighten the Screw again If the leakage is larger at the right below then adjust the lower screw as FIG 5 15 Loosen the screw push the door close to the oven to hook the door hook with the switch holder tightly then tighten the screw again and open an...

Страница 23: ...r with two screws turn the fan around till it can move flexibly Then install them to the oven and plug in the two terminal plugs If the fan can move flexibly then the winding of the fan motor should be examined Measure the winding with R 100 grade of a avometer if it is open circuited it indicates the winding of the fan motor has broken and should be re placed by a new same model one 5 5 4 4 T TH ...

Страница 24: ...e cause of the excessive leakage 4 Hold the oven in your facility and instruct the owner not to use the unil until the oven has 3 In the event that the oven operates with the door open The following procedures should be followed 1 Tell the user not to operate the oven 2 Hold the oven in your facility until it is investigated and repaired 3 Contact the manufacturer and CDRH FDA immediately 6 6 2 2 ...

Страница 25: ...ime power distributor or the micro switch Fix them 3 The food can be heated but the lamp is not on The lamp broken The plug falls off Change a new lamp Insert the plug again 4 The food can be heated but the turntable tray is not rotating The turntable motor broken The plug fall off Connecting shaft weave broken Change the turntable motor Inset the plug securely Change the weave 5 The oven can heat...

Страница 26: ...ul it or renew it 11 Electricity leaking The earthing insulation resistance of all the motors or the transformer are less than 2 megaohms Test where is the leaking place then repair it or change those damaged components S SP PE EC CI IF FI IC CA AT TI IO ON NS S Power Consumption 120V 60Hz 1450W Microwave Power Output 1000W Operation Frequency 2450MHz Outside Dimensions H W D 11 9 20 5 17 1 in Ove...

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