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Model: EM-U1000

Microwave Oven

Service Manual

REFERENCE NO. SM1

00006

Содержание 10 Pwr Lvls

Страница 1: ...Model EM U1000W B Microwave Oven Service Manual REFERENCE NO SM1500006 ...

Страница 2: ...0 THE FAN MOTOR 11 1 11 THE CAPACITOR 12 1 12 THE DIOD 12 1 13 THE TURNTABLE COMBINATION 13 1 14 THE DOOR SAFETY INTERLOCKS 13 1 15 THE CONTROL PANEL OF A TYPICAL MICROWAVE OVEN 14 BREAKDOWN ANALYSIS AND THE MEANS OF OVERHAULING 15 1 16 EXAMINING THE BREAKDOWN CAUSES 15 1 17 SPOT EXAMINING STEPS OF THE MICROWAVE OVEN 15 1 18 REPAIRING METHOD OF SEVERAL BREAKDOWN 18 1 19 THE REQUIREMENTS OF MICROWA...

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: ...s direction would change tens billion times 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 t...

Страница 5: ...wave generator to keep the oven working steadily from a too high temperature If something is wrong with the cooking system because the temperature is too high the control system would cut off the power automatically to prevent microwave generator being damaged from the high temperature Now we d like to introduce the working principle of each part of the widely used model mechanical control and tou...

Страница 6: ...face 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 1 1 3 3 C CO OO OL LI IN NG G S SY YS ST TE EM M In the working process of the microwave oven the magnetron of...

Страница 7: ...e 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 l...

Страница 8: ...the typical carton type heating FIG 2 8 The heating chamber is mainly composed of oven door and oven cavity From the microwave 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 cav...

Страница 9: ... 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 T TY YP PI IC CA AL L C CI IR RC CU UI ...

Страница 10: ...tout 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 temperature l...

Страница 11: ...doorframe from the doorplate FIG 4 2 10 Take off the hook spring with pointed pliers 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 on i...

Страница 12: ...e 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 1 1 8 8 T TH HE E M MA A...

Страница 13: ...re 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 stuck on the oven 3 Plug in all the terminals of the transformer preci...

Страница 14: ... FIG 4 12 1 1 1 11 1 T TH HE E C CA AP PA AC CI IT TO OR R Firstly do as the 1 2 and 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 has three foot near the diode 4...

Страница 15: ...ven 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 1 1 1 14 4 T TH HE E D DO OO OR R S SA AF FE ET 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 whi...

Страница 16: ...ntling the PC board and door release mechanism 1 Pull out all the 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 fi...

Страница 17: ...Pipa pipa 1 1 1 17 7 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 1 1 1 17 7 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 multimeter or a megaohmmeter the value should not be less than 2 megaohms Otherwise pa...

Страница 18: ...about 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 multimeter 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 s...

Страница 19: ...int out from zero 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 poles of the capacitor then the insulation between the capacitor pole and the cabinet should be measured with R 10K grade of an multimeter The resistance value should be FIG 5 12 If it is short circuited or has a number reading it indicates that ...

Страница 20: ...ust the screws which fix the interlock holder and the hook If the leakage is the larger side at the right above of the 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...

Страница 21: ...the engine oil can not be sucked up After the bearing being cleaned the felt should be refueled fully with engine oil for when the oven is operating the engine oil empty into the oil bearing slowly Fix the bearing cover 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 ...

Страница 22: ...well 2 Repair the unit at no cost to the owner 3 Investigate the oven and ascertain the 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 ...

Страница 23: ...gnetron or the capacitor loosed Change a new transformer Change the magnetron Change the time 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 brok...

Страница 24: ... 10 The door release button fall off Worn out and aged after long time operating Overhaul 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 ...

Страница 25: ... ne en nt ts s L Li is st t PART NO COMPONENT CODE NO Name QTY C01 GA EM U1000C01 P C board 1 C02 GA EM U1000C02 turntable motor 1 GA EM U1000W03 power cord 1 C03 GA EM U1000C03 power cord 1 C04 GA EM U1000C04 wire harness 1 C05 GA EM U1000C05 transformer 1 C06 GA EM U1000C06 microswitch 2 C07 GA EM U1000C07 microswitch 1 C08 GA EM U1000C08 magnetron 1 ...

Страница 26: ...P34 foam cushion 1 P09 GA EM U1000P09 shockproof rubber 1 P35 GA EM U1000P35 foam cushion 1 P10 GA EM U1000P10 microswitch mounting 1 P36 GA EM U1000P36 plate 1 P11 GA EM U1000P11 power cord holder 1 P37 GA EM U1000P37 plastic bag 1 P12 GA EM U1000P12 air duct 1 P39 GA EM U1000P39 manual 1 P13 GA EM U1000P13 lamp holder 1 P40 GA EM U1000P40 plastic bag 1 P15 GA EM U1000P15 label 1 P41 GA EM U1000P...

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