R-480J

 

TEST PROCEDURES

 

 

PROCEDURE

COMPONENT TEST

LETTER

 

B.Continuity check must be carried out with measuring instrument which is set to the highest resistance range.

C.A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10MΩ after it has been charged.

D.A short-circuited capacitor shows continuity all the time.

E.An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ resistance.

F.When the internal wire is opened in the high voltage capacitor shows an infinite resistance.

G.The resistance across all the terminals and the chassis must be infinite when the capacitor is normal. If incorrect reading are obtained, the high voltage capacitor must be replaced.

CARRY OUT 4R CHECKS.

ESWITCH TEST

CARRY OUT 3D CHECKS.

Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table.

Table: Terminal Connection of Switch

Plunger Operation

COM to NO

COM to NC

COM;

Common terminal

Released

Open circuit

Short circuit

NO;

Normally open terminal

Depressed

Short circuit

Open circuit

NC;

Normally close terminal

 

 

 

 

 

If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.

CARRY OUT 4R CHECKS.

FNOISE FILTER TEST CARRY OUT 3D CHECKS.

Disconnect the leads from the terminals of the noise filter. Using an ohmmeter, check between the terminals as de- scribed in the following table.

N

 

L

 

 

FUSE

 

NOISE SUPPRESSION COIL

F10A

 

 

MEASURING POINT

INDICATION OF OHMMETER

 

 

Between N and L

Open circuit

Between terminal N and WHITE

Short circuit

 

 

Between terminal L and RED

Short circuit

LINE CROSS CAPACITOR

0.068∝/AC250V

0.0022∝/AC 250V 0.0022∝/AC 250V

If incorrect readings are obtained, replace the noise filter unit.

WHT

RED

 

 

CARRY OUT 4R CHECKS.

 

 

GTHERMAL CUT-OUT TEST

CARRY OUT 3D CHECKS.

Disconnect the leads from the terminals of the thermal cut-out. Then using an ohmmeter, make a continuity test across the two terminals as described in the table below.

CARRY OUT 4R CHECKS.

Table: Thermal cut-out Test

 

Temperature of "ON"

Temperature of "OFF"

Indication of ohmmeter

Parts Name

condition (closed circuit) (˚C)

condition (open circuit) (˚C)

(When room temperature

 

 

 

is approx. 20˚C)

Thermal cut-out 145˚C

This is not resetable type.

Above 145˚C

Closed circuit.

 

 

 

 

If incorrect readings are obtained, replace the thermal cut-out.

An open circuit thermal cut-out 145˚C (MAGNETRON) indicates that the magnetron has over- heated, this may be due to restricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit.

An open circuit thermal cut-out 145˚C (OVEN) indicates that the foods in the oven may catch fire, this may be due to over heating produced by improper setting of the cooking time or failure of the control panel.

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Sharp R-480J Procedure Component Test Letter, Switch Test, Noise Filter Test Carry OUT 3D Checks, Thermal CUT-OUT Test
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R-480J specifications

The Sharp R-480J is a notable microwave oven that combines advanced technology with practical design, catering to both everyday cooking needs and more complex culinary tasks. This model is designed for consumers seeking reliability and efficiency in their kitchen appliances.

One of the standout features of the Sharp R-480J is its powerful 900-watt output. This high wattage allows for faster cooking times, making meal preparation a breeze. The microwave also offers multiple power levels, which provides the user with the flexibility to cook a variety of dishes. Whether you are reheating leftovers, defrosting meats, or cooking fresh vegetables, the R-480J delivers consistent and thorough results.

The microwave is equipped with a spacious interior, accommodating larger dishes with ease. Its turntable design ensures even cooking by allowing food to rotate during the cooking process. This feature minimizes cold spots in the food, ensuring that meals are heated uniformly.

User-friendliness is a key aspect of the Sharp R-480J. The appliance comes with an intuitive control panel featuring pre-programmed settings for common food items such as popcorn, pizza, and dinner plates, making it easy for users to select the right cooking time and power level with just a few button presses. Additionally, the digital display shows cooking times and power levels clearly, enhancing the overall cooking experience.

The R-480J also incorporates advanced sensor cooking technology. This innovative feature detects humidity levels emitted by food and adjusts cooking time accordingly. This means users can achieve perfect results without constantly monitoring the microwave, allowing for greater convenience and efficiency in daily cooking.

Moreover, the microwave's sleek and modern design fits well into various kitchen aesthetics. Its easy-to-clean surfaces minimize maintenance efforts, while the compact build allows it to be placed in smaller kitchens without taking up too much space.

In conclusion, the Sharp R-480J microwave oven stands out for its powerful performance, user-friendly features, and practical design. Its combination of high wattage, multiple power levels, and sensor cooking technology makes it a versatile appliance for any kitchen. Whether tackling daily meals or experimenting with new recipes, the R-480J is equipped to meet diverse cooking needs with ease and efficiency.
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