Sharp R-216LS service manual Description of Operating Sequence, OFF Condition, Cooking Condition

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R216LS

CHAPTER 6. OPERATION

[1] DESCRIPTION OF OPERATING SEQUENCE

The following is a description of component functions during oven operation.

1. OFF CONDITION

Closing the door activates door sensing switch and secondary inter- lock switch. (In this condition, the monitor switch contacts are opened.)

When oven is plugged in, 120 volts A.C. is supplied to the control unit. through the noise filter (Figure O-1).

1)The display will show flashing "88:88".

2)To set any program or set the clock, touch the STOP/CLEAR pad. The display will clear, and " : " will appear.

2. COOKING CONDITION

Program desired cooking time by touching the NUMBER pads. And program the power level by touching the POWER LEVEL pad.

When the START pad is touched, the following operations occur:

1)1.The contacts of the relays are closed and components connected to the relays are turned on as follows.

(For details, refer to Figure O-2)

RELAY

CONNECTED COMPONENTS

RY-1

oven lamp/turntable motor/fan motor

RY-2

power transformer

2)120 volts A.C. is supplied to the primary winding of the power trans- former and is converted to about 3.35 volts A.C. output on the fila- ment winding, and approximately 2000 volts A.C. on the high voltage winding.

3)The filament winding voltage heats the magnetron filament and the H.V. winding voltage is sent to a voltage doubler circuit.

4)The microwave energy produced by the magnetron is channelled through the waveguide into the cavity feed-box, and then into the cavity where the food is placed to be cooked.

5)Upon completion of the cooking time, the power transformer, oven lamp, etc. are turned off, and the generation of microwave energy is stopped. The oven will revert to the OFF condition.

6)When the door is opened during a cook cycle, monitor switch, door sensing switch, secondary interlock switch and primary interlock relay are activated with the following results. The circuits to the oven lamp, turntable motor, the cooling fan motor, and the high volt- age components are de-energized, and the digital read-out dis- plays the time still remaining in the cook cycle when the door was opened.

7)The monitor switch is electrically monitoring the operation of the secondary interlock switch and primary interlock relay (RY2) and is mechanically associated with the door so that it will function in the following sequence.

a)When the door opens from the closed position, the secondary interlock switch, door sensing switch and primary interlock relay (RY2) open their contacts. Then the monitor switch contacts close.

b)(2)When the door is closed from the open position, the monitor switch contacts open first. Then the contacts of the secondary interlock switch and door sensing switch close.

If the secondary interlock switch and primary interlock relay (RY2) fail with the contacts closed when the door is opened, the closing of the monitor switch contacts will form a short circuit through the monitor fuse, primary interlock relay (RY2) and secondary interlock switch, causing the monitor fuse to blow.

3. POWER LEVEL COOKING

When Variable Cooking Power is programmed, the 120 volts A.C. is supplied to the power transformer intermittently through the contacts of relay (RY-2) which is operated by the control unit within a 32 second time base. Microwave power operation is as follows:

VARI-MODE

ON TIME

OFF TIME

P-HI (100% power)

32 sec.

0 sec.

P-90 (approx. 90% power)

30 sec.

2 sec.

P-80 (approx. 80% power)

26 sec.

6 sec.

P-70 (approx. 70% power)

24 sec.

8 sec.

P-60 (approx. 60% power)

22 sec.

10 sec.

P-50 (approx. 50% power)

18 sec.

14 sec.

P-40 (approx. 40% power)

16 sec.

16 sec.

P-30 (approx. 30% power)

12 sec.

20 sec.

P-20 (approx. 20% power)

8 sec.

24 sec.

P-10 (approx. 10% power)

6 sec.

26 sec.

P-0 (0% power)

0 sec.

32 sec.

NOTE: The ON/OFF time ratio does not correspond with the per- centage of microwave power, because approx. 3 seconds are needed for heating of the magnetron filament.

4. POWER OUTPUT REDUCTION

If the oven is set for more than 20 minutes at 80, 90 or 100% power level, after the first 20 minutes the power level will automatically adjust itself to 70% power to avoid overcooking.

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Contents Model R-216LS Adjustment Procedure Precautions for Using Lead Free SolderComponent Replacement Microwave Measurement PROBefore Servicing After repairing When the testing is completedBefore Servicing Requirements Microwave Measurement ProcedurePreparation for testing Leakage testForeword and Warning ForewordProduct Description 1 Specifications DescriptionGrounding Instructions Oven DiagramGeneral Information OvenTouch Control Panel Description of Operating Sequence Power Level CookingPower Output Reduction OFF ConditionOff Condition Schematic Door Closed Clock Appears on DisplayOven Schenatic Cooking ConditionDescription and Function of Components Troubleshooting Guide Troubleshooting ChartProcedure B Power Transformer Test Test ProceduresProcedure a Magnetron Assembly Test Procedure C High Voltage Rectifier TestProcedure F Secondary Interlock Switch Test Procedure D High Voltage Capacitor TestProcedure E Temperature Fuse Oven Test Procedure F Primary Interlock System TestProcedure H Blown Minitor Fuse Test Procedure G Monitor Switch TestPrimary Interlock Relay RY2 Key Unit Procedure I Noise Filter TestProcedure J Touch Control Panel Assembly Test Control UnitProcedure K KEY Unit Test Procedure L Relay TestProcedure M Defrost Test Procedure N Foil Pattern on the Printed Wiring Board TestR216LS Outline of Touch Control Panel Touch Control Panel AssemblyPrecautions for Handling Electronic Components Servicing for Touch Control PanelOther Precautions Servicing ToolsEmploying lead-free solder Precautions for Using LEAD-FREE SolderUsing lead-free wire solder SolderingComponent Replacement and Adjustment PROCE- Dure Outer Case RemovalReinstall Power Transformer RemovalPositive Lock Connector NO-CASE Type Removal Magnetron RemovalGraphic Sheet and Membrane Switch Replacement Control Panel Assembly RemovalTrol Panel Assembly Removal Turntable Motor Removal Power Supply Cord ReplacementCooling FAN Motor Removal Make Sure That the FAN Blade Rotates Smooth After Installed InstallationAdjustment Make Sure That the Axis of the Shaft is not SlantedAfter adjustment, check the following Door ReplacementAfter any service, make sure of the following Figure C-7. Door Replacement Sealer FilmDiagrams Pictorial Diagram FigureControl Panel Circuit Figure S-2 Liquid Crystal DisplayUnit Printed Wiring Board Figure S-3DIP 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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