[10] Procedure I: NOISE FILTER TEST

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

R216LS

NOISE FILTER

2.Open the door and block it open.

3.Discharge high voltage capacitor.

4.Disconnect the lead wires from the terminal the noise filter. Using an ohmmeter, check between the terminals as described in the following table. If incorrect reading are obtained, replace the noise filter.

5.Reconnect all leads removed from components during testing.

6.Reinstall the outer case (cabinet).

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

8.Run the oven and check all functions.

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.

NL

FUSE 15A

LINE CROSS CAPACITOR

0.22μF / AC 250V

NOISE SUPPRESSION COIL

LINE BYPASS

LINE BYPASS

CAPACITOR

CAPACITOR

0.0033μF / AC 250V

0.0033μF / AC 250V

WHITE

RED

[11] Procedure J: TOUCH CONTROL PANEL ASSEMBLY TEST

The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter and ohmmeter.

In this service manual, the touch control panel assembly is divided into two units, Control Unit and Key Unit, and troubleshooting by unit replacement is described according to the symptoms indicated.

Before testing,

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.

1. Key Unit

NOTE:

1)Check key unit ribbon connection before replacement.

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

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

4)Run the oven and check all functions.

The following symptoms indicate a defective key unit.

a)When touching the pads, a certain pad produces no signal at all.

b)When touching a number pad, two figures or more are displayed.

c)When touching the pads, sometimes a pad produces no signal.

If the key unit is defective.

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)Replace the key unit.

5)Reconnect all leads removed from components during testing.

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

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

8)Run the oven and check all functions.

2. Control Unit.

The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure K) to determine if control unit is faulty.

1)In connection with pads.

a)When touching the pads, a certain group of pads do not produce a signal.

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Sharp R-216LS Procedure I Noise Filter Test, Procedure J Touch Control Panel Assembly Test, Key Unit, Control Unit

R-216LS specifications

The Sharp R-216LS is a versatile microwave oven that combines affordability with a range of features designed to enhance your cooking experience. Compact yet powerful, this model is especially suitable for small kitchens or dorm rooms, where space is at a premium.

One of the standout features of the Sharp R-216LS is its impressive 800 watts of cooking power. This ensures quick and efficient heating, allowing users to prepare meals in a fraction of the time compared to conventional ovens. The microwave also features a variety of power levels, providing flexibility for different types of cooking and reheating tasks, from defrosting frozen food to cooking delicate items like baked goods.

The R-216LS comes equipped with a spacious 20-liter capacity, which is surprisingly roomy for its size. This allows for ample space to heat up large dishes or multiple servings at once. The interior is designed with easy cleaning in mind, featuring a non-stick coating that prevents food from adhering to the surfaces and simplifies maintenance.

In terms of usability, the Sharp R-216LS boasts a user-friendly interface with straightforward knobs and buttons. It includes a timer and a range of pre-programmed cooking options, enabling users to cook a variety of foods with just the touch of a button. This is particularly beneficial for those new to microwave cooking or for busy individuals looking to save time.

The microwave also incorporates advanced technologies, including inverter microwave technology, which provides a continuous stream of cooking power for more even heating and defrosting. This ensures that your food is cooked thoroughly without the risk of hot and cold spots.

Safety is another priority in the design of the R-216LS. It features a child safety lock, which prevents accidental operation, making it a perfect choice for families with young children. The model also has an automatic shut-off feature, ensuring that the microwave turns off when not in use.

In summary, the Sharp R-216LS is a compact microwave that offers a blend of power, convenience, and safety features, making it an excellent choice for anyone seeking a reliable cooking appliance. Whether for reheating leftovers, cooking meals, or defrosting ingredients, this microwave is designed to meet the diverse needs of modern kitchens. With its combination of thoughtful design and functionality, the R-216LS stands out as a worthy investment for those looking for efficiency and performance in their cooking appliances.