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Midea MM720CFA-PM0C, Service Manual

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Midea MM720CFA-PM0C Service Manual Download Page 16

 

 

 

MOTOR TEST PROCEDURE

 

COMPONENTS TEST 

PROCEDURE 

RESULTS 

Fan Motor 

(Wire leads removed) 

Measure the resistance. 
(Ohm-meter scale:R

×

100) 

 

 

 
Normal:Approx. 47

Ω

 

Abnormal:

∞

 

or Several 

Ω

 

 
 

Turntable Motor 

(Wire leads removed)

 

Measure the resistance. 
(Ohm-meter scale:R

×

1000) 

 

 

 

 
Normal:Approx. 3.2k

Ω

 

Abnormal:

∞

 

or Several 

Ω

 

 

 

NOTE:

   

z

  A MICROWAVE LEAKGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS 

SERVICED FOR ANY REASON.   

z

  MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION. 

z

  WHEN REMOVING THE WIRE LEADS FROM THE PARTS,BE SURE TO GRASP THE 

CONNECTOR ,NOT THE WIRES.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5-8

 

Summary of Contents for MM720CFA-PM0C

Page 1: ...MICROWAVE OVEN MODEL 700W 220V50Hz SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READTHE SAFETY PRECAUTIONS IN THIS MANUAL MM720CFA PM0C...

Page 2: ...r closing 3 seal and sealing surfaces arcing wear and other damage 4 damage to or loosening of hinges and latches 5 evidence of dropping or abuse C Before turning on microwave power for any service te...

Page 3: ...M 4 1 CIRCUIT DESCRIPTION 4 2 SERVICE INFORMATION 5 1 TOOLS AND MEASURING INSTRUMENTS 5 1 MICROWAVE LEAKAGE TEST 5 2 MEASUREMENT OF MICROWAVE POWER OUTPUT 5 3 TROUBLE SHOOTING PROCEDURES 5 4 COMMON BR...

Page 4: ...atch hole and the interlock switches area Unlike other appliances the microwave oven is high voltage and high current equipment Though it is free from danger in ordinary use extreme care should be tak...

Page 5: ...gth 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 field strength and...

Page 6: ...and flat surface at least 10 cm 4 inches from the wall 7 Place the microwave oven as far away as possible from TV RADIO COMPUTER etc to prevent interference BEFORE YOU BEGIN READ THE FOLLOWING INSTRUC...

Page 7: ...OR CLOSED CONDITION ON SECONDARY BL WH FUSE FILTER ASS Y BR GE BL N L SINGLE PHASE ONLY POWER SUPPLY GE N L BL SWITCH BK NO INTERLOCK MONITOR COM NC M BL TM 2 SWITCH UPPER INTERLOCK PRIMARY BK SWITCH...

Page 8: ...r is also directed into the oven to exhaust the vapor in the oven through the upper plate Timer starts rotating 3 2 volts AC is generated from the filament winding of the high voltage transformer This...

Page 9: ...icrowave leakage Check for microwave leakage after every servicing The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 5 mW cm2 Always start measuring...

Page 10: ...n 1 inch sec 2 5 cm sec along the shaded area otherwise a false reading may result The test probe must be held with the grip portion of the handle A false reading may result if the operator s hand is...

Page 11: ...on the center of the turntable which is in the lowest position and the microwave power switched on The time T for the temperature of the water to rise by a value T of 10 2 K is measured where T is th...

Page 12: ...Measure the insulating resistance with a multi meter or a mega ohmmeter The value should not less than 2 mega ohm Otherwise part examination should be taken at once Such as checking whether the motor...

Page 13: ...itor pole and the cabinet FIG 5 6 should be checked If the resistance value between the capacitor pole and the cabinet is the capacitor is normal Then check the earth of the magnetron s two filament t...

Page 14: ...t the upper screw 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...

Page 15: ...cutout is playing its protective role and you should check whether the fan is working in normal Turn off the oven pull out the power plug take down the outer case discharge the capacitor then turn th...

Page 16: ...Turntable Motor Wire leads removed Measure the resistance Ohm meter scale R 1000 Normal Approx 3 2k Abnormal or Several NOTE z A MICROWAVE LEAKGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICE...

Page 17: ...Insert the plug securely 3 Change the weave 5 The oven can heat within 2 3 minutes but can not heat from the fourth minutes 1 The winding of the fan motor in open circuited 2 The fan falls off 3 The...

Page 18: ...ck the electrical continuity 2 2 Make sure the power cord is pulled out and the high voltage capacitor is discharged before the electrical continuity check 2 3 Set the ohmmeter to Low Resistance range...

Page 19: ...3 Check the following items before turning the oven ON 1 Proper door closing seal choke surfaces and hinges 2 No outer case damage 3 Proper interlock and monitor operations Insulation Resistance Test...

Page 20: ......

Page 21: ...MM720CFA PM0C...

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