PERIUK(rice cooker)

8/10/2019 PERIUK(rice cooker)

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ACTIVITY 4

TOPIC: RICE COOKER

OBJECTIVES:

1. To familiarize yourself with the operation and control panel of the rice cooker

2. To state the functions of each control of the rice cooker

3.

To measure the resistance readings of the rice cooker heating elements

4. To open and expose each component in the rice cooker

5. To familiarize yourself with each component of the rice cooker

6.

To state the function of each component of the rice cooker

7. To sketch and label the pictorial view of the rice cooker

8.

To draw the schematic diagram of the rice cooker circuit

TOOLS AND EQUIPMENT USED

1. Multimeter

2. Megger ohmmeter

3. Test pen

4.

Phillip and star screw driver set

5. Long nose plier

6. Diagonal cutter

Figure 1: Rice Cooker


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PROCEDURE

1. The service manual provided was referred and the rice cooker was operated.

2.

The specification label was located and read, and then the information was recorded

in Table 1.

Brand: MAGIC

Model No: CFXB05-2

Voltage: 240V

Frequency: 60Hz

Power: 700W

3.

The front panel of the rice cooker was observed and the observation was recorded in

the report especially the control knob of the rice cooker.

4. An appropriate tool, the back cover of the rice cooker unit was open up and the

electrical connection of the rice cooker was observed. The block diagram and the

possible circuit diagram of the rice cooker were drawing in the spaces provided.

Figure 2: Block Diagram of the Electrical Connection of the Rice Cooker

Table 1: Specification of Rice Cooker

THERMOSTATPOWER

SUPPLY

240V

MICRO SWITCH

HEATING

ELEMENT

OUTPUT/

READY TO USE


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5. Power supply plug of the rice cooker was removed from the 240 Volt AC main

supply socket.

6. An appropriate tool was used, the back cover of the rice cooker was open up and the

electrical connection of the rice cooker electrical system was observed.

7.

The power plugs were not connected to the main supply socket. The work was doing

with the power OFF.

8. The multimeter or megger ohmmeter was used, the insulation resistance and short

circuit tests of the L (live), N (neutral), E (earth) connection of the supply cables were

doing. The reading was recorded in the Table 2.

Wires Insulation Test (OHM) Short Circuit Test (OHM)

L and N

L and E

N and E

9. An each component in the rice cooker compartment was dismantled and the labelled

exploded view of the circuit showing the correct connection of the rice cooker

electrical circuit was draw. For the convenience, the service manual was referred.

Figure 3: Circuit Diagram of the Electrical Connection of the Rice Cooker

Table 2: Insulation and Short Circuit Tests


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10. The component was identified and the function of each component was written down

in Table 3.

Components Functions

Heating elements Element in an electrical device which convertselectricity into heat

thermostat As the heat generating and controlling unit

LED for cook and warm

mode

To tell that the switch in cook condition or warm

condition

screw As connector the iron

Power supply cord To give the power supply 240v

Inner pot Water and rice are placed when cooking rice

Switch for cook and warm As switch when cook and warm the rice

Rice cooker main body As body the rice cooker and to isolate part from

heating element and other body

Micro switch To move from a position of cooking to warming or

vice versa

Thermo fuse To break the current work when the heat exceeds

the fair due to the damage of rice cookers

11. A multimeter was used, a continuity and resistance tests to the heating element was

doing and the reading was recorded in the Table 4.

Points Ohmmage Reading

Body to L terminal

L to N terminal

Body to N terminal

Table 3: The function of each component

Table 4: Continuity and Resistance Test


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12. The common problem of the Iron was stated. The possible causes also stated and the

idea was suggested to solve the problems.

Problem Possible Causes Solutions

Rice does not

cook Heating elements are

broken Change heating elements

Rice cooker does

not work Fuse is defective Change the new fuse

The rice cooker

smokes when

plug it in and turn

it on.

Spilled food on the

heating element or

metal housing.

Unplug the rice cooker,

let it cool to room

temperature and wipe off

the spills with a clean,

damp cloth or sponge.Towel-dry before using it

again.

13.

Any defective component was replaced, and the component was reassembling back to

normal. After that, the instructor was checking the work

14.

The rice cooker was tested and the safety aspects were not forgotten.

Table 5: Problem, causes and solutions


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LABELED EXPLODED VIEWS

LABELED PART:

1)

Inner pot

2) Rice cooker main body

3) Detachable power cord

4)

Inner lid

5) Condensation cup

6) Control panel

1

3

2

4

6

5


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COMPONENT VIEW PART

Rice cooker main body

Port of electrical plug

Cover

LED for cook and warm mode

Switch for cook and warm mode

Inner lid

Heating element


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Heating element

Micro switch

Outside of cooking chamber

Pressure sensor

Thermostat

Condition when no load Condition when there load

Thermo fuse


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QUESTIONS

1. What are the effects of the line frequency (50 Hz) to the operation of the iron?

Iron operating at 50Hz because most electronic equipment in Malaysia is set to a

frequency of 50Hz. This line frequency is a most efficient for the 240 volt that supply

for domestic uses.

2. How does a megger ohmmeter help your to decide that the rice cooker is safe?

Megger ohmmeter is used to apply the insulation and short circuit tests on the

connection of the supply cable to trace that the iron in safe condition. After done the

testing the result must show that for a good condition reading is not less than 1M for

the every connection of phase(L and N),(L and E),(N and E).

3. How does a rice cooker work?

When the rice is cooked and the cooking button is pressed, the button will be stuckthere and the heater will start working. Because there is water in the pot, then the

temperature will not exceed 100 degrees Celsius. Heating element will continue to

heat up the pot and eventually the water in the pot will be reduced because turned into

vapour and absorbed into the rice. When water run out, the temperature of the rice is

no longer stuck at 100 degrees Celsius. When the temperature beyond the boiling

point, the thermostat has been set at a certain temperature will track the rise and cut

the heater circuit. At this time the pot will change from function to function heats only

the cooking.


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DISCUSSIONS

At the end of practice, we can identify some of the damage that occurs in a rice

cooker such as rice does not cook, this is causes by heating elements are broken. The other

problem is the rice cooker does not work and the rice cooker smokes when plug it in and turn

it on, this is causes by fuse is defective and spilled food on the heating element or metal

housing. So for the solution, we can change the heating elements to a new set of heating

element. Then for the fuse is defective, we can change a new fuse so it can function. The

solution for last problem that the rice cooker smokes when plug it in and turn it on is first,

unplug the rice cooker and let it cool to room temperature. And then, wipe off the spills with

a clean, damp cloth or sponge. Wipe with a dry towel before using it again.


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CONCLUSION

As a conclusion, after we had done doing the experiment, we know the operation of

the rice cooker. We also know how to open all the part in the rice cooker and we can detect

the part that is always problem and broken. Rice cooker categorized as heating equipment.

The function of rice cooker is to cook rice. The damage of rice cooker is heating elements are

broken, fuse is defective and there have spilled food on the heating element or metal housing.

If the damage is not serious, we can repair. As an example if the damage is related to the

heating element, we need to change the new heating element.

Besides that, we also learn about the operation of the rice cooker. When the rice is

cooked and the cooking button is pressed, the button will be stuck there and the heater will

start working. Because there is water in the pot, then the temperature will not exceed 100

degrees Celsius. Heating element will continue to heat up the pot and eventually the water in

the pot will be reduced because turned into vapour and absorbed into the rice. When water

run out, the temperature of the rice is no longer stuck at 100 degrees Celsius. When the

temperature beyond the boiling point, the thermostat has been set at a certain temperature will

track the rise and cut the heater circuit. At this time the pot will change from function to

function heats only the cooking.

We also know the important reason we need to learn the ways to repair our electronic

component. That is because in our daily, we are used many things that is related to the

component electronic. Furthermore, we can practice the knowledge that we learned about this

rice cooker to repair our broken rice cooker at home especially if the damaged part is just a

little and easy to repair.


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REFERENCES

1.

http://home.howstuffworks.com/rice-cooker1.htm

2.

http://baikitvkuantan.blogspot.com/

3.

http://myplasticfreelife.com/2011/07/how-i-fixed-my-broken-rice-cooker-the-

complete-illustrated-instructions/

4.

http://www.dummies.com/how-to/content/simple-solutions-for-slow-cooker-

dilemmas.html

5.

http://www.electronicspoint.com/threads/rice-cooker.256567/

6.

http://www.doityourself.com/forum/electric-small-kitchen-home-appliances/497043-

oster-rice-cooker-blown-temperature-switch-thermostat.html#b

ATTACHMENTS
http://home.howstuffworks.com/rice-cooker1.htmhttp://home.howstuffworks.com/rice-cooker1.htmhttp://baikitvkuantan.blogspot.com/http://baikitvkuantan.blogspot.com/http://myplasticfreelife.com/2011/07/how-i-fixed-my-broken-rice-cooker-the-complete-illustrated-instructions/http://myplasticfreelife.com/2011/07/how-i-fixed-my-broken-rice-cooker-the-complete-illustrated-instructions/http://myplasticfreelife.com/2011/07/how-i-fixed-my-broken-rice-cooker-the-complete-illustrated-instructions/http://myplasticfreelife.com/2011/07/how-i-fixed-my-broken-rice-cooker-the-complete-illustrated-instructions/http://myplasticfreelife.com/2011/07/how-i-fixed-my-broken-rice-cooker-the-complete-illustrated-instructions/http://www.dummies.com/how-to/content/simple-solutions-for-slow-cooker-dilemmas.htmlhttp://www.dummies.com/how-to/content/simple-solutions-for-slow-cooker-dilemmas.htmlhttp://www.dummies.com/how-to/content/simple-solutions-for-slow-cooker-dilemmas.htmlhttp://www.dummies.com/how-to/content/simple-solutions-for-slow-cooker-dilemmas.htmlhttp://www.dummies.com/how-to/content/simple-solutions-for-slow-cooker-dilemmas.htmlhttp://www.electronicspoint.com/threads/rice-cooker.256567/http://www.electronicspoint.com/threads/rice-cooker.256567/http://www.doityourself.com/forum/electric-small-kitchen-home-appliances/497043-oster-rice-cooker-blown-temperature-switch-thermostat.html#bhttp://www.doityourself.com/forum/electric-small-kitchen-home-appliances/497043-oster-rice-cooker-blown-temperature-switch-thermostat.html#bhttp://www.doityourself.com/forum/electric-small-kitchen-home-appliances/497043-oster-rice-cooker-blown-temperature-switch-thermostat.html#bhttp://www.doityourself.com/forum/electric-small-kitchen-home-appliances/497043-oster-rice-cooker-blown-temperature-switch-thermostat.html#bhttp://www.doityourself.com/forum/electric-small-kitchen-home-appliances/497043-oster-rice-cooker-blown-temperature-switch-thermostat.html#bhttp://www.doityourself.com/forum/electric-small-kitchen-home-appliances/497043-oster-rice-cooker-blown-temperature-switch-thermostat.html#bhttp://www.doityourself.com/forum/electric-small-kitchen-home-appliances/497043-oster-rice-cooker-blown-temperature-switch-thermostat.html#bhttp://www.electronicspoint.com/threads/rice-cooker.256567/http://www.dummies.com/how-to/content/simple-solutions-for-slow-cooker-dilemmas.htmlhttp://www.dummies.com/how-to/content/simple-solutions-for-slow-cooker-dilemmas.htmlhttp://myplasticfreelife.com/2011/07/how-i-fixed-my-broken-rice-cooker-the-complete-illustrated-instructions/http://myplasticfreelife.com/2011/07/how-i-fixed-my-broken-rice-cooker-the-complete-illustrated-instructions/http://baikitvkuantan.blogspot.com/http://home.howstuffworks.com/rice-cooker1.htm

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PERIUK(rice cooker)