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Sanyo EM-D975, Service Manual

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Sanyo EM-D975 Service Manual Download Page 26

Right heat insulated   

 

P82 

GA-D900L30RP82  key pads 

1 

P39 GA-D900L30RP39 

  fibre glass (rear) 

1 

 

P83 

GA-D900L30RP83  lower heater holder 

1 

P40 

GA-D900L30RP40  base plate 

1   

  

  

  

  

P41 GA-D900L30RP41 

Label 

2 

 

 

 

 

 

P42 GA-D900L30RP42 

Outer 

enclosure 

1 

 

PART  NO.  PART CODE NO. 

NAME QTY 

P43 GA-D900L30RP43 

Spacer 

1 

 B01 GA-D900L30RB01 

Foam 

cushion 

2 

P44 

GA-D900L30RP44  grill heater nut 

2   

B02 

GA-D900L30RB02  Cardboard 

1 

P45 

GA-D900L30RP45  grill heater collapsible   

2   

B03 

GA-D900L30RB03  Foam cushion 

1 

P46 

GA-D900L30RP46  Motor bracket 

1   

B04 

GA-D900L30RB04  Owner's manual 

1 

  

   

 

B05 

GA-D900L30RB05 

Plastic 

film 

1 

  

   

 

B06 

GA-D900L30PB06 

Plastic 

bag 

1 

  

   

 

B07 

GA-D900L30RB07 

Foam 

cushion 

2 

  

   

 

B08 

GA-D900L30RB08 

Plastic 

bag 

1 

  

   

 

B09 

GA-D900L30RB09 

Packing 

belt 

1 

  

   

 

B10 

GA-D900L30RB10 

Carton 

1 

  

   

 

B11 

GA-D900L30RB11 

Wrapping 

nail 

12 

 
 

EM-D975 Microwave Oven Components List 

PART  NO. 

PART CODE NO. 

NAME 

QTY 

C01 

GA-D900L30RC01 

Fan motor 

1 

C02 

GA-D900L30RC02 

H.V.capacitor 1 

C03 

GA-D900L30RC03 

H.V.diode 1 

C04 

GA-D900L30RC04 

PC board 

1 

C05 

GA-D900L30RC05 

wiring harness 

1 

C06 

GA-D900L30RC06 

Turntable motor 

1 

C07 

GA-D900L30RC07 

heater of Convection    

1 

C08 

GA-D900L30RC08 power 

cord 

1 

C09 

GA-D900L30RC09 

Microswitch  

1 

C10 

GA-D900L30RC10 

Microswitch  

2 

C11 

GA-D900L30RC11 

Oven lamp 

1 

C12 

GA-D900L30RC12 

Thermostat 1 

C13 

GA-D900L30RC13 

H.V.fuse 1 

C14 

GA-D900L30RC14 

Transformer 1 

C15 

GA-D900L30RC15 

Magnetron 1 

 

25

Summary of Contents for EM-D975

Page 1: ...Microwave Oven MODEL EM D975 Service Manual REFERANCE NO SM150008 ...

Page 2: ...G PRINCIPLE OF MICROWWAVE OVEN 4 2 1 HIGH VOLTAGE RECTIFYING CIRCUIT 4 2 2 MICROWAVE GENERATER 4 2 3 COOLING SYSTEM 5 2 4 ELECTRIC CONTROL SYSTEM 5 3 TYPICAL CIRCUIT ANALYASIS OF MICROWAVE OVEN 8 4 HOW TO ASSEMBLE AND DISASSEMBLE MICROWAVE OVEN COMPONENTS 9 4 1 THE CABINET 9 4 2 THE DOOR COMBINATION 10 4 3 THE CONTROL PANEL AND THE DOOR RELEASE MECHANISM 11 4 4 THE MAGNETRON 11 4 5 THE TRANSFORMER...

Page 3: ... wave guide or transmission line and cavity for proper alignment integrity and connections 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 A microwave leakage check to verify compliance with the Federal pe...

Page 4: ... 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 ra...

Page 5: ...ature 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 H V VO OL LT TA AG GE E R RE EC CT...

Page 6: ... 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 anode current Ib mA anode voltage e b kV m Fig 2 4 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 oven the magnetron often makes th...

Page 7: ...t switch S3 still at conducted condition would make the 230V voltage short circuited and fused the fuse and will never let the microwave oven working when the door is open From this we can understand the function of the interlock switch is when the door is unclosed the oven wouldn t work when the door is opened when the oven is working it would stop the working immediately FIG 2 5b 2 2 4 4 2 2 T T...

Page 8: ...illating 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 have a good impedance matching with the magnetron the energy should be less reflect a...

Page 9: ...TANT 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 front door plate Fig 2 9 current resistant constructure oven door noise filter 3 3 T TY YP PI IC CA AL L C CI IR RC CU UI IT T A AN NA AL LY YA AS SI IS S O OF F M MI IC CR RO OW WA AV VE E O OV VE EN N We have introduced ...

Page 10: ...g 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 lowered it will resume to close condition 4 4 H HO OW W T TO O A AS SS SE EM MB BL LE E A AN ND D D DI IS SA AS SS SE EM MB BL LE E M MI IC CR RO OW WA AV VE E O OV VE EN N C CO OM MP PO ON NE EN NT TS S In the fol...

Page 11: ...frame from the doorplate FIG 4 2 r a Fig 4 3 b Take off the hook spring with a pointed plier then the hook combination 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 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 o...

Page 12: ...disassemble Pull out the terminal plug of the time and power distributor Take off the screw which fix the control panel with a screwdriver FIG 4 6 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 4 4 4...

Page 13: ...se board make sure the screw hole are tallied then tighten the four screws for the high voltage winding is earthing here transformer base board screw seat Fig 4 9 Fig 4 10 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 Plug in all the terminals of the transfor...

Page 14: ...nd FIG 4 12 2 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 of this part To disassemble Pull the wires of the capacitor out 4 15 1 2 1 2 3 4 Loosen and take out the screw which fix the capacitor clip with a screwdriver and take out the clip and the capacitor 4 15 Fig 4 13 screw fan motor back board Fig 4 14 fan To assemble Place the capacitor in the capacitor clip ...

Page 15: ... motor with two screws FIG 4 17 Plug in the two wires Assemble and fix the middle base board with two screws FIG 4 18 Turn the oven back 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 Fig 4 19 turntable shaft supporter roller ring Firstly do as th...

Page 16: ...with a screwdriver Means of dismantling 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 Fig 4 22 5 Take off the range terminal plugs as FIG 4 24 shown that is press the two places ...

Page 17: ... wen noise Fig 5 1 glass tray 2 Long time shishi noise 3 Strike sound 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 meg...

Page 18: ...transformer with alternating 10V grade of an avometer the value should be 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 avometer FIG 5 6 If it is open circuited it indicates the magnetron has broken a...

Page 19: ...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 has been punctured or electricity leaked and should be replaced by a same model same capacity one If the resistance ...

Page 20: ...n 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 and close the door repeatedly to check whether the door can operate flexibly whether the hook and the switch are in their normal position If it is not in position then adjust the door hook and the switch holder repeatedly to make them to normal position to put thro...

Page 21: ...ter 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 HE E C CH HA AR RA AC CT TE ER RS S R RE EQ QU UI IR RE EM ME EN NT TS S O OF F M MI IC CR RO OW WA AV VE E A AF FT TE ER R I IT T H HA AS S B BE EE EN N R RE EP PA AI IR RE ED D After being repaired the microwave oven should have a 30 minutes trial operatio...

Page 22: ...l until the oven has 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 I IN NT TE ER RL LO OC CK K A AS SS SE EM MB BL LY Y R RE EP PL LA AC CE EM ME EN NT T A AN ND D A AD DJ JU U...

Page 23: ... 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 wi...

Page 24: ...sition of the door Change the hook 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 8 8 E EM M D D9 97 75 5 e ex xp pl lo od de e d dr ra aw wi...

Page 25: ...19 Sponge 1 P60 GA D900L30RP60 Roller ring 1 P20 GA D900L30RP20 Foot pin 4 P61 GA D900L30RP61 Ring wheel 3 P21 GA D900L30RP21 Foot 4 P62 GA D900L30RP62 Shaft 1 P22 GA D900L30RP22 Inner rotary arm 1 P63 GA D900L30RP63 Washer 1 P23 GA D900L30RP23 Outer rotary arm 1 P64 GA D900L30RP64 Shock proof rubber 2 P24 GA D900L30RP24 Interlock support 1 P65 GA D900L30RP65 Baking plate 1 P25 GA D900L30RP25 Lamp...

Page 26: ...m 1 B06 GA D900L30PB06 Plastic bag 1 B07 GA D900L30RB07 Foam cushion 2 B08 GA D900L30RB08 Plastic bag 1 B09 GA D900L30RB09 Packing belt 1 B10 GA D900L30RB10 Carton 1 B11 GA D900L30RB11 Wrapping nail 12 EM D975 Microwave Oven Components List PART NO PART CODE NO NAME QTY C01 GA D900L30RC01 Fan motor 1 C02 GA D900L30RC02 H V capacitor 1 C03 GA D900L30RC03 H V diode 1 C04 GA D900L30RC04 PC board 1 C0...

Page 27: ... GA D900L30RC16 fuse 1 C17 GA D900L30RC17 thermostat 1 C18 GA D900L30RC18 Convection motor 1 C19 GA D900L30RC19 temperature sensor 1 C20 GA D900L30RC20 wave filter 1 C21 GA D900L30RC21 Heater of grill 1 26 ...

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