R - 5 2 0 L K

R-520LW

 

TEST PROCEDURES

PROCEDURE

COMPONENT TEST

LETTER

 

 

 

L

FOIL PATTERN ON THE PRINTED WIRING BOARD TEST

 

To protect the electronic circuits, this model is provided with a fine foil pattern added to the

 

primary on the PWB, this foil pattern acts as a fuse.

1.Foil pattern check and repairs.

1)Disconnect the power supply cord, and then remove outer case.

2)Open the door and block it open.

3)Discharge high voltage capacitor.

4)Follow the troubleshooting guide given below for repair.

STEPS

OCCURRENCE

CAUSE OR CORRECTION

 

 

 

1

Only pattern at "a" is broken.

*Insert jumper wire J1 and solder.

2

Pattern at "a" and "b" are broken.

*Insert the coil RCILF2003YAZZ between "c" and "d".

 

 

 

5)Make a visual inspection of the varistor. Check for burned damage and examine the transformer with a tester for the presence of layer short-circuit (check the primary coil resistance which is approximately 563ý ± 10%).If any abnormal condition is detected, replace the control unit assembly.

6)Reconnect all leads removed from components during testing.

7)Re-install the outer case (cabinet).

8)Reconnect the power supply cord after the outer case is installed.

9)Run the oven and check all functions.

 

 

 

RY2

 

 

a

 

c

J1

b

d

 

 

 

L1

 

 

 

 

VRS1

 

2. Follow the troubleshooting guide given below, if indicator does not light up after above check and

repairs are finished.

 

1)

Disconnect the power supply cord, and then remove outer case.

2)

Open the door and block it open.

 

3)

Discharge high voltage capacitor.

 

4)

Disconnect the leads to the primary of the power transformer.

5)

Ensure that these leads remain isolated from other components and oven chassis by using

 

 

insulation tape.

 

6)

After that procedure, re-connect the power supply cord.

7)

Follow the troubleshooting guide given below for repair.

 

 

 

 

 

STEPS

OCCURRENCE

CAUSE OR CORRECTION

 

 

 

The rated AC voltage is not present between

 

 

 

1

the normal open terminal of the relay RY1 and

Check supply voltage and oven power cord.

 

 

 

the normal open terminal of the relay RY2.

 

 

 

 

 

 

 

 

2

The rated AC voltage is present at primary side

Low voltage transformer or secondary circuit defective.

 

 

 

of low voltage transformer.

Check and replace control unit assembly.

 

 

 

 

 

8)

Disconnect the power supply cord, and then remove outer case.

9)

Open the door and block it open.

 

10)

Discharge high voltage capacitor.

 

11)

Reconnect all leads removed from components during testing.

12)

Re-install the outer case (cabinet).

 

13)

Reconnect the power supply cord after the outer case is installed.

14)

Run the oven and check all functions.

 

(5) The oven will operate for the first 16 seconds, without generating microwave energy.

20

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Sharp R-520LW, R-520LK Primary on the PWB, this foil pattern acts as a fuse, Steps Occurrence Cause or Correction
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R-520LK, R-520LW specifications

The Sharp R-520LW and R-520LK are innovative microwave ovens that combine advanced technology with user-friendly features to enhance cooking experiences. Designed with modern kitchens in mind, these models embody efficiency, precision, and versatility.

One of the defining characteristics of both the R-520LW and R-520LK is their powerful 900-watt output, which allows for speedy cooking and reheating. This high wattage ensures that food is cooked evenly and retains its moisture, preventing the common issue of dry or unevenly heated meals. Furthermore, the inclusion of multiple cooking power levels provides users with flexibility, making it easy to select the ideal setting for various types of food.

Both models feature Sharp's signature Inverter Technology. Unlike traditional microwaves that use a turn-on and turn-off cycling method, inverter technology delivers a steady stream of cooking power. This results in more consistent heating, allowing delicate foods such as fish or custards to be cooked perfectly without overcooking the edges. This technology not only enhances the quality of cooked food but also improves the overall efficiency of the microwave.

The R-520LW and R-520LK come equipped with a variety of auto-cook settings that cater to different culinary needs. From popcorn to frozen vegetables, these pre-programmed settings allow users to prepare meals with just a touch of a button, making cooking uncomplicated for all skill levels. The large, user-friendly control panel features intuitive buttons and a digital display, ensuring effortless operation and visibility.

In terms of design, the R-520LW boasts a sleek white finish, while the R-520LK offers a modern black aesthetic. Both models are compact yet spacious, with a generous interior capacity that can accommodate a range of dish sizes. The turntable feature further enhances cooking efficiency by ensuring even cooking all around.

Cleaning and maintaining the R-520LW and R-520LK is a breeze, thanks to their easy-to-wipe surfaces and the interior's cavity that can be easily accessed. The durable construction of these microwaves means they are designed to withstand the rigors of daily use.

In summary, the Sharp R-520LW and R-520LK microwave ovens stand out with their advanced features, such as inverter technology and pre-programmed cooking settings, making them excellent choices for anyone looking to streamline their kitchen tasks. Their stylish designs and user-friendly interfaces further enhance their appeal, making them valuable additions to any modern home.
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