Sharp R-930AW Operation, Description of Operating Sequence, OFF Condition, Cooking Condition

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R-930AK

R-930AW

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

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

OFF CONDITION

Closing the door activates the door sensing switch and secondary interlock 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. (Figure O-1).

1.The display will show "SHARP SIMPLY THE BEST PRESS CLEAR AND PRESS CLOCK".

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

NOTE: When the door is opened, the oven lamp comes on.

2.A signal is input to the control unit, energizing the coil of shut-off relay (RY-4). RY4 contacts close, completing a circuit to the damper motor. The damper motor now operates moving the damper to the open position, thereby closing the contacts of the damper switch inputs a signal to the control unit. The coil of relay RY-4 is de-energized, opening its contacts, thereby turning off the damper motor.

COOKING CONDITION

Program desired cooking time Variable Cooking Control by touching the NUMBER pads and the power level pad. When the START pad is touched, the following operations occur:

1.The contacts of 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

RY-2

Power transformer

RY-3

Heating element

RY-4

Damper motor

RY-5

Convevtion motor

RY-6

Fan motor

2.120 volts A.C. is supplied to the primary winding of the power transformer and is converted to about 3 volts A.C. output on the filament winding, and approximately 2360 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, the primary interlock relay and the secondary interlock switch are activated with the

following results. The circuits to the turntable motor, the cooling fan motor, and the high voltage components are de-energized, the oven lamp remains on, and the digital read-out displays the time still remaining in the cook cycle when the door was opened.

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

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

(2)When the door is closed from the open position, the monitor switch contacts first open, and then the contacts of the primary interlock relay and the secondary interlock

switch close.

If the primary interlock relay and the secondary interlock switch fail with their 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 and the secondary interlock switch, causing the moni- tor fuse to blow.

POWER LEVEL P-0 TO P-90 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). RY-2 is operated by the control unit within an varying time base. Microwave power operation is as follows:

VARI-MODE

ON TIME

OFF TIME

Power 10(P-HI)

32 sec.

0 sec.

(100% power)

 

 

Power 9(P-90)

30 sec.

2 sec.

(approx. 90% power)

 

 

Power 8(P-80)

26 sec.

6 sec.

(approx. 80% power)

 

 

Power 7(P-70)

24 sec.

8 sec.

(approx. 70% power)

 

 

Power 6(P-60)

22 sec.

10 sec.

(approx. 60% power)

 

 

Power 5(P-50)

18 sec.

14 sec.

(approx. 50% power)

 

 

Power 4(P-40)

16 sec.

16 sec.

(approx. 40% power)

 

 

Power 3(P-30)

12 sec.

20 sec.

(approx. 30% power)

 

 

Power 2(P-20)

8 sec.

24 sec.

(approx. 20% power)

 

 

Power 1(P-10)

6 sec.

26 sec.

(approx. 10% power)

 

 

Power 0(P-0)

0 sec.

32 sec.

(0% power)

 

 

Note: The ON/OFF time ratio does not correspond with the percentage of microwave power, because approx. 2 seconds are needed for heating of the magnetron filament.

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Contents Table of Contents Convection Microwave Oven930AK 930AW Before Servicing Leakage test Microwave Measurement ProcedureRequirements Sharp PLAZA, Mahwah Convection Microwave Oven930AK / R-930AW ForewordSpecification General InformationDescription Grounding InstructionsOven Diagram Touch Control PanelPower Level P-0 to P-90 Cooking OperationDescription of Operating Sequence OFF ConditionConvection Cooking Condition Automatic MIX Cooking ConditionSensor Cooking Condition Preheating ConditionFire Sensing Feature Microwave Mode Compu BROIL/ Compu ROAST/ Compu BakeCompu Defrost Cooking Cooking SequenceSchematic Diagram Figure O-1. Oven Schematic-OFF ConditionFigure O-4. Oven Schematic-Convection Cooking Condition Description and Function of Components Troubleshooting Guide Heating ElementConvection Cooking System Damper OPEN-CLOSE MechanismTest Procedure Problem Possible Cause Defective PartsTest Procedures Procedure Component Test Letter Magnetron Assembly TestPower Transformer Test High Voltage Rectifier TestProcedure Component Test Letter Secondary Interlock Switch TestMonitor Switch Temperature Fuse TestTest Procedures Component Test Letter Damper Switch TestChecking Temperature in the Convection Mode Thermal CUT-OUT TestKEY Unit Test Outer Case Switch TestTouch Control Panel Assembly Test Compu Defrost Test Weight 1ST Stage 2ND Stage 3RD Stage 4TH Stage Level TimeRelay Test Occurrence Cause or Correction AH Sensor TestChecking the initial sensor cooking condition Water load cooking testTest Procedures Letter Component Test Testing Method for AH Sensor AND/OR Control UnitChecking Control Unit R1,R2 22Ω ± R3 4.3kΩ ± 5% 1/4WTouch Control Panel Assembly ThermistorDescription of LSI LSIIZA797DRTOR Signal similar to P27 Segment data signalsSegment data signal Key strobe signalAbsolute Humidity Sensor Circuit Structure of Absolute Humidity SensorServicing Component Replacement and Adjustment Procedure Outer Case Switches ReplacementPower Transformer Removal Outer Case RemovalHigh Voltage Rectifier Assembly Removal Positive Lock Connector NO-CASE Type RemovalMagnetron Removal High Voltage Capacitor RemovalDamper Assembly Removal Turntable Motor RemovalOven Lamp and Lamp Socket Removal FAN Motor RemovalControl Panel Assembly and Control Unit Removal Control Unit and KEY UnitDoor Replacement and Adjustment After adjustment, check the followingDoor Adjustment After adjustment, make sure of the followingDoor Disassembly Figure C-5. Door Replacement and adjustmentFigure S-1. Pictorial Diagram Circuit Control PanelDIP Control Panel Parts Electrical PartsCabinet Parts Oven Parts VSDTA123ES/-3Screws Nuts and Washers Door PartsMiscellaneous HOW to Order Replacement Parts Packing and AccessoriesModel Number DescriptionOven Control Panel Parts Door Parts Miscellaneous 930AK 930AW
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R-930AW specifications

The Sharp R-930 series of microwave ovens, including the R-930AK, R-930AW, and R-930CS models, represent a blend of advanced technology and user-centric design. These units are well-suited for modern kitchens, offering convenience, versatility, and efficiency that meet the needs of busy households.

One of the standout features of the R-930 series is the powerful Inverter Technology. Unlike traditional microwaves that rely on pulsing power to cook food at lower settings, Inverter Technology delivers a steady stream of cooking power. This results in more even heating, improved texture, and better overall cooking results for delicate dishes like custards and sauces.

The spacious interior of these models provides ample room for cooking a variety of dishes simultaneously. The R-930 series is designed with a turntable that ensures uniform cooking by rotating food as it heats. Additionally, these microwaves often come with a variety of pre-programmed settings for popular dishes, making it easier for users to prepare meals with minimal effort. These presets take the guesswork out of cooking and help ensure consistent results every time.

The R-930AK and R-930AW models are particularly noted for their sleek and modern aesthetic, available in stylish black and white exteriors, respectively. Both models also feature user-friendly controls, which include a digital display and intuitive buttons, ensuring that even those new to microwave cooking can navigate settings with ease.

Another characteristic that distinguishes the R-930CS is its advanced sensor cooking technology. This feature monitors the cooking process and automatically adjusts power levels and cooking times to achieve optimal results. This takes the hassle out of determining how long to cook various foods, especially those that require specific attention to avoid overcooking or undercooking.

The Sharp R-930 series also emphasizes safety and convenience. Child safety locks are integrated into the design to prevent unauthorized use, making it a practical choice for families with young children. Moreover, the easy-clean interior ensures that spills and splatters can be quickly wiped away, maintaining hygiene and preserving the appliance's appearance.

In summary, the Sharp R-930AK, R-930AW, and R-930CS models are proficient microwave ovens equipped with innovative technologies and thoughtful features that cater to a variety of cooking needs. With their combination of inverter cooking technology, spacious interiors, sleek designs, and user-friendly controls, these models are ideal choices for anyone looking to enhance their culinary capabilities in a fast-paced world.
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