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INSTALLATIONS 

 

INSTALLING 

1. Empty the microwave oven and clean inside it with 

a soft, damp cloth. Check for damage such as 

misaligned door, damage around the door or dents 

inside the cavity or on the exterior. 

 

2. Put the oven on a counter, table, or shelf that is 

strong enough to hold the oven and the food and 

utensils you put in it. (The control panel side of the 

oven is the heavy side. Use care when handling.) 

 

3. Do not block the vent and the air intake openings. 

Blocking vent or air intake openings can cause 

damage to the oven and poor cooking results. 

Make sure the microwave oven legs are in place to 

ensure proper air flow. 

 

4. The oven should not be installed in any area where 

heat and steam are generated, because they may 

damage the electronic or mechanical parts of the 

unit. 

Do not install the oven next to a conventional 

surface unit or above a conventional wall oven. 

 

5. Use microwave oven in an ambient temperature 

less than 104°F(40°C). 

 

6. Place the microwave oven on a sturdy 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 INSTRUCTIONS COMPLETELY 

EARTHING INSTRUCTIONS 

This microwave oven is designed to be used in a fully 

earthed condition. 

It is imperative, therefore, to make sure it is properly 

earthed before servicing 

WARNING-   

THIS  APPLIANCE 

MUST BE EARTHED 

IMPORTANT

 

 

The wires in this mains lead are colored in 

accordance with the following code: 

Green-and-yellow:              Earth 
Blue:                                      Neutral 
Brown:                                  Live

 

As the colors of the wires in the mains lead of this 

appliance may not correspond with the colored 

markings identifying the terminals in your plug, 

proceed as follows. 

 

The wire which is colored 

green-and-yellow 

must be 

connected to the terminal in the plug which is marked 

with the letter 

or by the 

earth symbol 

(

 ) or 

colored 

green 

or 

green-and-yellow

 

The wire which is colored 

blue 

must be connected to 

the terminal in the plug which is marked with the letter 

or colored 

black

 

The wire which is colored 

brown 

must be connected 

to the terminal in the plug which is marked with the 

letter 

or colored 

red

3-1 

Summary of Contents for MM720CRK-PM0C

Page 1: ...MICROWAVE OVEN MODEL 700W 220V50Hz SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT READTHE SAFETY PRECAUTIONS IN THIS MANUAL MM720CRK 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: ...MM720CRK PM0C...

Page 21: ...MM720CRK PM0C...

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