Sharp R-480J Key Unit, Control Unit, Reset Circuit, Indicator Circuit, Power Source Circuit

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R-480J

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

The touch control section consists of the following units.

(1)Key Unit

(2)Control Unit (The Control Unit consists of Power Unit and LSI Unit).

The principal functions of these units and the signals communicated among them are explained below.

Key Unit

The key unit is composed of a matrix, signals generated in the LSI are sent to the key unit through P00-P07. When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through P14-P17, AIN6 and AIN7 to perform the function that was re- quested.

Control Unit

Control unit consists of LSI, reset circuit, indicator circuit, power source circuit, relay circuit, buzzer circuit, synchro- nizing signal circuit, absolute humidity sensor circuit and back light circuit.

1)Reset Circuit

This circuit generates a signal which resets the LSI to the initial state when power is supplied.

2)Indicator Circuit

This circuit consists of 40 segments and 16 common electrodes using a Liquid Crystal Display.

3)Power Source Circuit

This circuit generates voltages necessary in the con- trol unit from the AC line voltage.

In addition, the synchronizing signal is available in order to compose a basic standard time in the clock circuit.

Symbol

Voltage

Application

VC -5V LSI(IC1)

4)Relay Circuit

A circuit to drive the magnetron, fan motor, turntable motor and light the oven lamp.

5)Buzzer Circuit

The buzzer is responsive to signals from the LSI to emit audible sounds (key touch sound and completion sound).

6)Synchronizing Signal Circuit

The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit.

It accompanies a very small error because it works on commercial frequency.

7)2nd. Interlock Relay Control Switch

A switch to “tell” the LSI if the door is open or closed.

8)Back Light Circuit

A circuit to drive the back light (Light emitting diodes LD10-LD15).

9)Absolute Humidity Sensor Circuit

This circuit detects moisture of the cooking food to allow its automatic cooking.

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Contents Table of Contents Microwave Oven Model R-480J480J 480J Sharp Corporation OSAKA, JapanMicrowave Oven General Important InformationDescription Product SpecificationsGeneral Information This Appliance Must be EarthedAppearance View Touch Control PanelMicrowave Cooking Condition Operation SequenceOFF Condition Variable CookingPower Output Reduction Cooking SequenceSensor Instant Reheat Function of Important Components Remember to Check 3D Troubleshooting GuideServicing Remember to Check 4RTest Procedure Possible Cause Defective Parts ProblemTest Procedures Procedure Component Test Letter Magnetron TestMicrowave Output Power 1 litre water load High Voltage Rectifier Assembly Test Test Procedures Letter Component TestPower Transformer Test High Voltage Capacitor TestNoise Filter Test Carry OUT 3D Checks Procedure Component Test LetterSwitch Test Thermal CUT-OUT TestTouch Control Panel Assembly Test Blown Fuse F10A Carry OUT 3D ChecksHigh Voltage Fuse Test KEY Unit Test Relay TestAH Sensor Test Carry OUT 3D Checks Steps Occurrence Cause or CorrectionOmif Checking the initial sensor cooking conditionChecking Control Unit Test Procedures LetterTesting Method for AH Sensor AND/OR Control Unit Sensor Dummy Resistor CircuitPower Source Circuit Reset CircuitIndicator Circuit Synchronizing Signal CircuitLSI Signal similar to P17 Pin No Signal DescriptionSignal coming from touch key Power source voltage GND0VCommon data signal COM6 Common data signal COM8Common data signal COM7 Common data signal COM5Absolute Humidity Sensor Circuit Structure of Absolute Humidity SensorShapes of Electronic Components Other PrecautionsTouch Control Panel Servicing Servicing of Touch Control PanelComponent Replacement and Adjustment Procedure Power Transformer RemovalOuter Case Removal Magnetron Removal Positive Lock Connector NO-CASE Type RemovalHOW to RE-INSTALL the Turntable Motor Cover Turntable Motor RemovalInstallation Control Panel Assembly RemovalCPU Unit and Power Unit Oven Lamp and Lamp Socket RemovalRear View Power Supply Cord ReplacementAfter adjustment, check the following Side ViewRemoval Door ReplacementRE-INSTALL View back side of door frameAfter any service, make sure of the following InstallationSealer Film Requirement Preparation for TestingMicrowave Measurement Holaday HI Simpson 380MFigure O-1. Oven Schematic-OFF Condition Figure S-1. Pictorial Diagram High Voltage ComponentsFigure S-2. Power unitl Circuit Unit FigureS3.CPUCN a CN D D10 CN CZD1 SP1 VRB RY2 RY1 RY3 TTMParts List SCREWS, Nuts and Washers Packing and AccessoriesMiscellaneous 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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