Sharp R-520LK, R-520LW service manual AH Sensor Test, Checking the initial sensor cooking condition

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R - 5 2 0 L K

R-520LW

NAH SENSOR TEST

Checking the initial sensor cooking condition

WARNING : The oven should be fully assembled before following procedure.

(1)The oven should be plugged in at least two minutes before sensor cooking.

(2)Room temperature should not exceed 95½F (35½C).

(3)The unit should not be installed in any area where heat and steam are generated. The unit should not be installed, for example, next to a conventional surface unit. Refer to the “INSTALLATION INSTRUCTIONS” of the operation manual.

(4)Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To permit adequate ventilation, be sure to install so as not to block these vents. There should be some space for air circulation.

(5)Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture with a dry cloth or paper towel.

(6)The Sensor works with food at normal storage temperature. For example, chicken pieces would be at refrigerator temperature and canned soup at room temperature.

(7)Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The sensor will detect the vapor given of by the spray and turn off before food is properly cooked.

(8)If the sensor has not detected the vapor of the food, ERROR will appear and the oven will shut off.

Water load cooking test

WARNING : The oven should be fully assembled before following procedure.

Make sure the oven has been plugged in at least two minutes before checking sensor cook operation. The cabinet should be installed and screws tightened.

(1)Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.

(2)Place the container on the center of tray in the oven cavity.

(3)Open the door.

(4)Touch the TIMER/CLOCK once and the POWER LEVEL pad twice. Close the door and touch the START pad once. Open the door and touch the number pads 1 once and the number pad 4 once. Close the door and touch the START pad. Now, the oven is in the sensor cooking condition, and "AH20", "SENSOR" and "COOK" will appear in the display.

(5)The oven will operate for the first 16 seconds, without generating microwave energy.

NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during first stage of sensor cooking.

(6) After approximately 16 seconds, microwave energy is produced.

If ERROR is displayed or the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below. If the oven stops after 5 minutes and ERROR is displayed, the AH sensor is normal. Check other parts except the AH sensor.

TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT

To determine if the sensor is defective, the simplest method is to replace it with a new replacement sensor.

(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)Remove the AH sensor.

(5)Install the new AH sensor.

(6)Reconnect all leads removed from components during testing.

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

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

(9)Reconnect the oven to the power supply and check the sensor cook operation as follows:

9-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.

9-2. Place the container on the center of tray in the oven cavity.

9-3. Open the door.

9-4. Touch the TIMER/CLOCK pad once and the POWER LEVEL pad twice. Close the door and touch the START pad once. Open the door and touch the number pads 1 once and the number pad 4. Close the door and the touch the START pad.

9-5. The control panel is in automatic Sensor operation.

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Contents 520LW Table of ContentsBefore Servicing Dont Touch Before Servicing When the testing is completedMicrowave Measurement Procedure RequirementsLeakage test Microwave Ovens Sharp PLAZA, Mahwah520LK/R-520LW ForewordGeneral Information SpecificationDescription Grounding InstructionsTouch Control Panel Oven DiagramOperation Power Level P-0 to P-90 CookingDescription of Operating Sequence OFF ConditionMicrowave Sensor Cooking ConditionClock Appears on Display SchematicDescription and Function of Components Troubleshooting Guide Test Procedure Test ProceduresProblem Procedure Component Test Letter Magnetron Assembly TestProcedure Component Test Letter Microwave Output PowerPower Transformer Test Cavity Temperature Fuse Test Procedure Component Test Letter High Voltage Rectifier TestMagnetron Temperature Fuse Test High Voltage Capacitor TestPrimary Interlock Switch Test Replace Temperature FuseRun the oven and check all functions Secondary Interlock System TestTouch Control Panel Assembly Test Procedure Component Test Letter Monitor Switch TestKEY Unit Test Figure of all digits flickerRelay Test Compu Defrost TestMenu 1ST Stage 2ND Stage 3RD Stage STEAKS/CHOPS Level Time Steps Occurrence Cause or Correction Primary on the PWB, this foil pattern acts as a fuseTesting Method for AH Sensor AND/OR Control Unit AH Sensor TestChecking the initial sensor cooking condition Checking Control Unit R1, R2 22Ω ± 1% 1/2W R3 4.3Ω ± 5% 1/4W R4 1MΩ ± 5% 1/4WSensor Dummy Resistor Circuit Indicator Circuit Reset CircuitPower Source Circuit Synchronizing Signal CircuitLSI Description of LSIInternal clock oscillation frequency control input setting Signal similar to ANI3Power source voltage Key strobe signalConverter power source voltage GND0V Converter power source voltageCommon data signal Structure of Absolute Humidity Sensor Absolute Humidity Sensor CircuitOperational Principle of Absolute Humidity Sensor Detector Circuit of Absolute Humidity Sensor CircuitTouch Control Panel Servicing Other PrecautionsServicing of Touch Control Panel Servicing ToolsComponent Replacement and Adjustment Procedure Outer Case RemovalTo prevent an electric shock, take the following pre Re-install Power Transformer RemovalHigh Voltage Rectifier and High Voltage Capacitor Removal Magnetron RemovalControl Panel Assembly Removal Positive Lock Connector NO-CASE Type RemovalGraphic Sheet and Membrane Switch Replacement Oven Lamp and Lamp Socket RemovalTurntable Motor Removal InstallationCooling FAN Motor Removal InstallationRemoval Rear ViewAfter adjustment, check the following Door ReplacementRE-INSTALL After any service, make sure of the followingSealer Film High Voltage Components DiagramCircuit Control Unit Figure S-5 . Printed Wiring Board of Power Unit Parts List Miscellaneous HOW to Order Replacement PartsSCREWS,NUTS and Washers Model NumberOven and Cabinet Parts Control Panel Parts Door Parts Miscellaneous Packing and Accessories Copyright 2006 by Sharp Corporation ALL Rights Reserved

R-520LK, R-520LW specifications

The Sharp R-520LW and R-520LK are innovative microwave ovens that combine advanced technology with user-friendly features to enhance cooking experiences. Designed with modern kitchens in mind, these models embody efficiency, precision, and versatility.

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The R-520LW and R-520LK come equipped with a variety of auto-cook settings that cater to different culinary needs. From popcorn to frozen vegetables, these pre-programmed settings allow users to prepare meals with just a touch of a button, making cooking uncomplicated for all skill levels. The large, user-friendly control panel features intuitive buttons and a digital display, ensuring effortless operation and visibility.

In terms of design, the R-520LW boasts a sleek white finish, while the R-520LK offers a modern black aesthetic. Both models are compact yet spacious, with a generous interior capacity that can accommodate a range of dish sizes. The turntable feature further enhances cooking efficiency by ensuring even cooking all around.

Cleaning and maintaining the R-520LW and R-520LK is a breeze, thanks to their easy-to-wipe surfaces and the interior's cavity that can be easily accessed. The durable construction of these microwaves means they are designed to withstand the rigors of daily use.

In summary, the Sharp R-520LW and R-520LK microwave ovens stand out with their advanced features, such as inverter technology and pre-programmed cooking settings, making them excellent choices for anyone looking to streamline their kitchen tasks. Their stylish designs and user-friendly interfaces further enhance their appeal, making them valuable additions to any modern home.
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