Sharp R-480J Test Procedures Letter, Testing Method for AH Sensor AND/OR Control Unit

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R-480J

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

 

 

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. Close the door.

9-4. Touch the CLOCK pad once, the POWER LEVEL pad twice, the START pad once, the number pad 1 once and the number pad 4 once.

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

9-6. The oven turns off automatically, and the time for detecting moisture will be displayed.

If new sensor dose not operate properly, the problem is with the control unit, and refer to explanation below.

CHECKING CONTROL UNIT

(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)Disconnect the sensor connector that is mounted to control panel.

(5)Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.

(6)Disconnect the leads to the primary of the power transformer.

(7)Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.

(8)After that procedure, re-connect the power supply cord.

(9)Check the sensor cook operation proceed as follows:

9-1. Touch the CLOCK pad once, the POWER LEVEL pad twice, the START pad once and the number pad 1 once and the number pad 4 once.

9-2. The control panel is in the sensor cooking operation.

9-3. After approximately 25 seconds, push plunger of select switch for more than 3 seconds. This condition is same as judgement by AH sensor.

9-4. After approximately 3 seconds, the display shows “ X X . X X “ which is the time for detecting moisture.

If the above is not the case, the control unit is probably defective. If the above is proper, the AH sensor is probably defective.

(10)Disconnect the power supply cord, and then remove outer case.

(11)Open the door and block it open.

(12)Discharge high voltage capacitor.

(13)Disconnect the dummy resistor circuit from the sensor connector of control panel.

(14)Carry out necessary repair.

(15)Reconnect all leads removed from components during testing and repairing.

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

(17)Reconnect the power supply cord after the outer case is installed. Run the oven and check all functions.

(18)Carry out "Water load cooking test" again and ensure that the oven works properly.

R1,R2 : 22Ω ± 1% 1/2W

R3 : 4.3kΩ ± 5% 1/4W

R4 : 1MΩ ± 5% 1/4W

To connector (F) on Control Unit.

F-1

1

 

 

 

2

 

 

COM

F-2

R1

 

3

 

 

 

 

 

 

F-3

 

R2

R3

R4

 

CONNECTOR

 

 

 

 

Plunger

NC

NO

COM

NO

NC

Sensor Dummy Resistor Circuit

15

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Contents Microwave Oven Model R-480J Table of Contents480J Microwave Oven Sharp Corporation OSAKA, Japan480J General Important InformationGeneral Information Product SpecificationsDescription This Appliance Must be EarthedTouch Control Panel Appearance ViewOFF Condition Operation SequenceMicrowave Cooking Condition Variable CookingSensor Instant Reheat Power Output ReductionCooking Sequence Function of Important Components Servicing Troubleshooting GuideRemember to Check 3D Remember to Check 4RProblem Test Procedure Possible Cause Defective PartsMicrowave Output Power 1 litre water load Test ProceduresProcedure Component Test Letter Magnetron Test Power Transformer Test Test Procedures Letter Component TestHigh Voltage Rectifier Assembly Test High Voltage Capacitor TestSwitch Test Procedure Component Test LetterNoise Filter Test Carry OUT 3D Checks Thermal CUT-OUT TestHigh Voltage Fuse Test Touch Control Panel Assembly TestBlown Fuse F10A Carry OUT 3D Checks Relay Test KEY Unit TestOmif Carry OUT 3D Checks Steps Occurrence Cause or CorrectionAH Sensor Test Checking the initial sensor cooking conditionTesting Method for AH Sensor AND/OR Control Unit Test Procedures LetterChecking Control Unit Sensor Dummy Resistor CircuitIndicator Circuit Reset CircuitPower Source Circuit Synchronizing Signal CircuitLSI Signal coming from touch key Pin No Signal DescriptionSignal similar to P17 Power source voltage GND0VCommon data signal COM7 Common data signal COM8Common data signal COM6 Common data signal COM5Structure of Absolute Humidity Sensor Absolute Humidity Sensor CircuitTouch Control Panel Servicing Other PrecautionsShapes of Electronic Components Servicing of Touch Control PanelOuter Case Removal Component Replacement and Adjustment ProcedurePower Transformer Removal HOW to RE-INSTALL the Turntable Motor Cover Positive Lock Connector NO-CASE Type RemovalMagnetron Removal Turntable Motor RemovalCPU Unit and Power Unit Control Panel Assembly RemovalInstallation Oven Lamp and Lamp Socket RemovalAfter adjustment, check the following Power Supply Cord ReplacementRear View Side ViewRE-INSTALL Door ReplacementRemoval View back side of door frameSealer Film After any service, make sure of the followingInstallation Microwave Measurement Preparation for TestingRequirement Holaday HI Simpson 380MFigure O-1. Oven Schematic-OFF Condition High Voltage Components Figure S-1. Pictorial DiagramFigure S-2. Power unitl Circuit FigureS3.CPU UnitZD1 SP1 VRB RY2 CN CCN a CN D D10 RY1 RY3 TTMParts List Miscellaneous Packing and AccessoriesSCREWS, Nuts and Washers Not replaceable items84-21 Control Panel Parts Door Parts Miscellaneous Copyright 2004 by Sharp Corporation ALL Rights Reserved

R-480J specifications

The Sharp R-480J is a notable microwave oven that combines advanced technology with practical design, catering to both everyday cooking needs and more complex culinary tasks. This model is designed for consumers seeking reliability and efficiency in their kitchen appliances.

One of the standout features of the Sharp R-480J is its powerful 900-watt output. This high wattage allows for faster cooking times, making meal preparation a breeze. The microwave also offers multiple power levels, which provides the user with the flexibility to cook a variety of dishes. Whether you are reheating leftovers, defrosting meats, or cooking fresh vegetables, the R-480J delivers consistent and thorough results.

The microwave is equipped with a spacious interior, accommodating larger dishes with ease. Its turntable design ensures even cooking by allowing food to rotate during the cooking process. This feature minimizes cold spots in the food, ensuring that meals are heated uniformly.

User-friendliness is a key aspect of the Sharp R-480J. The appliance comes with an intuitive control panel featuring pre-programmed settings for common food items such as popcorn, pizza, and dinner plates, making it easy for users to select the right cooking time and power level with just a few button presses. Additionally, the digital display shows cooking times and power levels clearly, enhancing the overall cooking experience.

The R-480J also incorporates advanced sensor cooking technology. This innovative feature detects humidity levels emitted by food and adjusts cooking time accordingly. This means users can achieve perfect results without constantly monitoring the microwave, allowing for greater convenience and efficiency in daily cooking.

Moreover, the microwave's sleek and modern design fits well into various kitchen aesthetics. Its easy-to-clean surfaces minimize maintenance efforts, while the compact build allows it to be placed in smaller kitchens without taking up too much space.

In conclusion, the Sharp R-480J microwave oven stands out for its powerful performance, user-friendly features, and practical design. Its combination of high wattage, multiple power levels, and sensor cooking technology makes it a versatile appliance for any kitchen. Whether tackling daily meals or experimenting with new recipes, the R-480J is equipped to meet diverse cooking needs with ease and efficiency.
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