Sharp R-930AW service manual Description and Function of Components

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R-930AK

R-930AW

DESCRIPTION AND FUNCTION OF COMPONENTS

DOOR SENSING AND SECONDARY INTERLOCK SWITCHES

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

DOOR SENSING

SWITCH

MONITOR FUSE

MONITOR SWITCH

SECONDARY

INTERLOCK

SWITCH

OUTER CASE SWITCHES

The two outer case switches are mounted near the power supply cord at the oven cavity rear plate. When the outer case cabinet is installed with the screws, one of the screws pushes the actuator and then the actuator pushes each plungers of the two outer case switches and their contacts are closed. When a cabinet mounting screw which is push- ing the actuator is removed, the two outer case switches interrupt the circuit to the all components.

WARNING

The circuit to all components can be connected to the power supply without the outer case cabinet by reinstall- ing the cabinet mounting screw. BUT AT THAT TIME,

NEVER TOUCH ANY PARTS OF THE HIGH VOLTAGE CIRCUIT TO AVOID ELECTROCUTION.

This outer case mounting screw is pushing the actuator.

Figure D-1. Door sensing switch, monitor switch and secondary interlock switches

MONITOR SWITCH

The monitor switch is mounted on the middle position of latch hook. It is activated (the contacts opened) by the lower latch head 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 and secondary interlock switch fail to open when the door is opened.

Functions:

1.When the door is opened, the monitor switch contact close (to the ON condition) due to their being normally closed. At this time the door sensing and secondary interlock switches are in the OFF condition (contacts open) due to their 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 the secondary interlock switch contacts close. (On opening the door, each of these switches operate inversely.)

3.If the door is opened, and the primary interlock relay and secondary interlock switch contacts 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, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (RE- FER TO CHAPTER “TEST PROCEDURE”).

NOTE: MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY.

 

OUTER CASE

ACTUATOR

CABINET

OUTER CASE

SWITCHES

THERMISTOR

The thermistor is a negative temperature coefficient type. The temperature in the oven cavity is detected through the resistance of the thermistor, and then the control unit causes the heater relay to operate, thus the current to the heating element is turned ON/OFF.

MAGNETRON TEMPERATURE FUSE.

The temperature fuse located on the waveguide is designed to prevent damage to the magnetron if an over heated condition develops in the megnetron due to cooling fan failure, obstructed air guide, dirty or blocked air intake, etc. Under normal operation, the temperature fuse remains closed. However, when abnormally high temperatures are reached within the magnetron, the temperature fuse will open at 302˚F(150˚C) causing the oven to shut down.

CONV. THERMAL CUT-OUT

The thermal cut-out located on the left side of the thermal protection plate (left) is designed to prevent damage to the heater unit if an over heated condition develops in the heating unit due to convection fan failure, thermistor failure, obstructed air ducts, dirty or blocked air intake, etc.

Under normal operation, the thermal cut-out remains closed. However, when abnormally high temperatures are reached within the heater unit, the thermal cut-out will open at 302˚F(150˚C) causing the oven to shut down.

When the thermal cut-out has cooled, the thermal cut-out closes at 266˚F(130˚C).

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Contents Convection Microwave Oven Table of Contents930AK 930AW Before Servicing Requirements Microwave Measurement ProcedureLeakage test Convection Microwave Oven Sharp PLAZA, Mahwah930AK / R-930AW ForewordGeneral Information SpecificationDescription Grounding InstructionsTouch Control Panel Oven DiagramOperation Power Level P-0 to P-90 CookingDescription of Operating Sequence OFF ConditionAutomatic MIX Cooking Condition Convection Cooking ConditionSensor Cooking Condition Preheating ConditionCompu BROIL/ Compu ROAST/ Compu Bake Fire Sensing Feature Microwave ModeCompu Defrost Cooking Cooking SequenceFigure O-1. Oven Schematic-OFF Condition Schematic DiagramFigure O-4. Oven Schematic-Convection Cooking Condition Description and Function of Components Heating Element Troubleshooting GuideConvection Cooking System Damper OPEN-CLOSE MechanismPossible Cause Defective Parts Test Procedure ProblemProcedure Component Test Letter Magnetron Assembly Test Test ProceduresPower Transformer Test High Voltage Rectifier TestSecondary Interlock Switch Test Procedure Component Test LetterMonitor Switch Temperature Fuse TestDamper Switch Test Test Procedures Component Test LetterChecking Temperature in the Convection Mode Thermal CUT-OUT TestTouch Control Panel Assembly Test Outer Case Switch TestKEY Unit Test Relay Test Weight 1ST Stage 2ND Stage 3RD Stage 4TH Stage Level TimeCompu Defrost Test AH Sensor Test Occurrence Cause or CorrectionChecking the initial sensor cooking condition Water load cooking testTesting Method for AH Sensor AND/OR Control Unit Test Procedures Letter Component TestChecking Control Unit R1,R2 22Ω ± R3 4.3kΩ ± 5% 1/4WThermistor Touch Control Panel AssemblyLSIIZA797DR Description of LSITOR Segment data signals Signal similar to P27Segment data signal Key strobe signalStructure of Absolute Humidity Sensor Absolute Humidity Sensor CircuitServicing Outer Case Switches Replacement Component Replacement and Adjustment ProcedurePower Transformer Removal Outer Case RemovalPositive Lock Connector NO-CASE Type Removal High Voltage Rectifier Assembly RemovalMagnetron Removal High Voltage Capacitor RemovalTurntable Motor Removal Damper Assembly RemovalOven Lamp and Lamp Socket Removal FAN Motor RemovalControl Unit and KEY Unit Control Panel Assembly and Control Unit RemovalAfter adjustment, check the following Door Replacement and AdjustmentDoor Adjustment After adjustment, make sure of the followingFigure C-5. Door Replacement and adjustment Door DisassemblyFigure S-1. Pictorial Diagram Control Panel CircuitDIP Cabinet Parts Electrical PartsControl Panel Parts VSDTA123ES/-3 Oven PartsMiscellaneous Door PartsScrews Nuts and Washers Packing and Accessories HOW to Order Replacement PartsModel 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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