Sharp R-216LS service manual Description and Function of Components

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R216LS

[3] DESCRIPTION AND FUNCTION OF COMPONENTS

1. DOOR OPEN MECHANISM

The door is opened by pushing the open button on the control panel, refer to the Figure D-1.

When the open button is pushed, the open button pushes up the switch lever, and then the switch lever pushes up the latch head. The latch heads are moved upward and released from latch hook. Now the door will open.

Door

Latch Hook

 

Door Sensing

Latch

Switch

 

Heads

 

 

Monitor Switch

Switch Lever

Secondary

 

 

Interlock Switch

Figure D-1. Door Open Mechanism.

2.DOOR SENSING AND SECONDARY INTERLOCK SWITCHES

The secondary interlock switch is mounted in the lower position of the latch hook and the door sensing switch in the primary interlock system is mounted in the upper position of the latch hook. They are activated by the latch heads on the door. When the door is opened, the switches interrupt the power to all high voltage components. A cook cycle can- not take place until the door is firmly closed thereby activating both interlock switches. The primary interlock system consists of the door sensing switch and primary interlock relay located on the control circuit board.

3. MONITOR SWITCH

The monitor switch is activated (the contacts opened) by the latch head on the door while the door is closed. The switch is intended to render the oven inoperative, by means of blowing the monitor fuse, when the contacts of the primary interlock relay (RY2) and secondary interlock switch fail to open when the door is opened.

Functions:

1)When the door is opened, the monitor switch contacts close (to the ON condition) due to their being normally closed. At this time the primary interlock relay (RY2) and secondary interlock switch are in the OFF condition (contacts open) due to its being normally open contact switches.

2)As the door goes to a closed position, the monitor switch contacts are first opened and then the door sensing switch and secondary interlock switch contacts close.

3)If the door is opened, and the primary interlock relay (RY2) and the secondary interlock switch contact fail to open, the monitor fuse blows simultaneously with closing of the monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE DOOR SENSING SWITCH, PRIMARY INTERLOCK RELAY (RY2), SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE").

NOTE: MONITOR FUSE AND MONITOR SWITCH ARE REPLACED

AS AN ASSEMBLY.

4. TURNTABLE MOTOR

The turntable motor rotates the turntable located on the bottom of the oven cavity, so that the food on the turntable is cooked evenly. The turntable may turn in either direction.

5. COOLING FAN MOTOR

The cooling fan motor drives a blade which draws external cool air. This cool air is directed through the air vents surrounding the magne- tron and cools the magnetron. This air is channelled through the oven cavity to remove steam and vapours given off from the heating foods. It is then exhausted through the exhausting air vents at the oven cav- ity.

6. TEMPERATURE FUSE (OVEN)

The temperature fuse, located on the top of the oven cavity, is designed to prevent damage to the oven by fire. If the food load is overcooked, by either error in cook time or defect in the control unit, the temperature fuse will open.

Under normal operation, the temperature fuse remains closed. How- ever, when abnormally high temperatures are reached within the oven cavity, the temperature fuse will open at 302°F(150°C), causing the oven to shut down.

7. THERMAL CUT-OUT (OVEN)

The thermal cut-out, located on the top of the oven cavity, is designed to prevent damage to the oven by fire. If the food load is overcooked, by either error in cook time or defect in the control unit, the thermal cut- out will open.

Under normal operation, the oven thermal cut-out remains closed. However, when abnormally high temperatures are reached within the oven cavity, the oven thermal cut-out will open at 293°F(145°C), caus- ing the oven to shut down.

8. MONITOR FUSE

1)The monitor fuse blows when the contacts (COM-NO) of the pri- mary interlock relay (RY2) and the secondary interlock switch remain closed with the oven door open and when the monitor switch closes.

2)If the wire harness or electrical components are short-circuited, this monitor fuse blows to prevent an electric shock or fire hazard.

9. NOISE FILER

The noise filter prevents the radio frequency interference that might flow back in the power circuit.

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Contents Model R-216LS Precautions for Using Lead Free Solder Component ReplacementAdjustment Procedure Microwave Measurement PROBefore Servicing When the testing is completed After repairingBefore Servicing Microwave Measurement Procedure Preparation for testingRequirements Leakage testForeword and Warning ForewordProduct Description 1 Specifications DescriptionOven Diagram General InformationGrounding Instructions OvenTouch Control Panel Power Level Cooking Power Output ReductionDescription of Operating Sequence OFF ConditionSchematic Door Closed Clock Appears on Display Oven SchenaticOff Condition Cooking ConditionDescription and Function of Components Troubleshooting Guide Troubleshooting ChartTest Procedures Procedure a Magnetron Assembly TestProcedure B Power Transformer Test Procedure C High Voltage Rectifier TestProcedure D High Voltage Capacitor Test Procedure E Temperature Fuse Oven TestProcedure F Secondary Interlock Switch Test Procedure F Primary Interlock System TestProcedure G Monitor Switch Test Procedure H Blown Minitor Fuse TestPrimary Interlock Relay RY2 Procedure I Noise Filter Test Procedure J Touch Control Panel Assembly TestKey Unit Control UnitProcedure K KEY Unit Test Procedure L Relay TestProcedure M Defrost Test Procedure N Foil Pattern on the Printed Wiring Board TestR216LS Touch Control Panel Assembly Precautions for Handling Electronic ComponentsOutline of Touch Control Panel Servicing for Touch Control PanelOther Precautions Servicing ToolsPrecautions for Using LEAD-FREE Solder Using lead-free wire solderEmploying lead-free solder SolderingComponent Replacement and Adjustment PROCE- Dure Outer Case RemovalPower Transformer Removal Positive Lock Connector NO-CASE Type RemovalReinstall Magnetron RemovalControl Panel Assembly Removal Graphic Sheet and Membrane Switch ReplacementTrol Panel Assembly Removal Power Supply Cord Replacement Turntable Motor RemovalCooling FAN Motor Removal Installation AdjustmentMake Sure That the FAN Blade Rotates Smooth After Installed Make Sure That the Axis of the Shaft is not SlantedDoor Replacement After adjustment, check the followingAfter any service, make sure of the following Figure C-7. Door Replacement Sealer FilmDiagrams Pictorial Diagram FigureControl Panel Circuit Figure S-2 Liquid Crystal DisplayPrinted Wiring Board Figure S-3 DIPUnit CodeMeno Parts Guide Oven Parts Oven Parts Parts Code Price NEW Description Rank MarkDoor and Control Panel Parts Door and Control Panel Parts „INDEX

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.
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