Sharp R-480J service manual Component Replacement and Adjustment Procedure, Outer Case Removal

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R-480J

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven.

1.Disconnect the oven from the power supply.

2.Make sure that a definite “click” can be heard when the microwave oven door is unlatched. (Hold the door in a closed position with one hand, then push the door open button with the other, this causes the latch leads to rise, it is then possible to hear a “click” as the door switches operate.)

3.Visually check the door and cavity face plate for damage (dents, cracks, signs of arcing etc.).

Carry out any remedial work that is necessary before operating the oven.

Do not operate the oven if any of the following conditions exist;

1.Door does not close firmly.

2.Door hinge, support or latch hook is damaged.

3.The door gasket or seal or damaged.

4.The door is bent or warped.

5.There are defective parts in the door interlock system.

6.There are defective parts in the microwave generating and transmission assembly.

7.There is visible damage to the oven.

Do not operate the oven:

1.Without the RF gasket (Magnetron).

2.If the wave guide or oven cavity are not intact.

3.If the door is not closed.

4.If the outer case (cabinet) is not fitted.

Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of the following removal procedures:

WARNING FOR WIRING

To prevent an electric shock, take the following

 

and Oven cavity.

manners.

 

3) Sharp edge:

1. Before wiring,

 

Bottom plate, Oven cavity, Waveguide flange,

1)

Disconnect the power supply.

 

Chassis support and other metallic plate.

2)

Open the door and wedge the door open.

 

4) Movable parts (to prevent a fault)

3)

Discharge the high voltage capacitor and wait for

 

Fan blade, Fan motor, Switch, Switch lever,

 

60 seconds.

 

Open button.

2. Don't let the wire leads touch to the following parts;

3.

Do not catch the wire leads in the outer case cabinet.

1)

High voltage parts:

4.

Insert the positive lock connector certainly until its

 

Magnetron, High voltage transformer, High

 

pin is locked. And make sure that the wire leads

 

voltage capacitor, High voltage rectifier assembly

 

should not come off even if the wire leads is pulled.

 

and High voltage fuse.

5.

To prevent an error function, connect the wire leads

2)

Hot parts:

 

correctly, referring to the Pictorial Diagram.

 

Oven lamp, Magnetron, High voltage transformer

 

 

OUTER CASE REMOVAL

To remove the outer case, proceed as follows.

1.Disconnect oven from power supply.

2.Open the oven door and wedge it open.

3.Remove the four (4) screws from rear and along the side edge of case.

4.Slide the entire case back about 1 inch (3 cm) to free it from retaining clips on the cavity face plate.

5.Lift the entire case from the oven.

6.Discharge the H.V. capacitor before carrying out any further work.

7.Do not operate the oven with the outer case removed. N.B.; Step 1,2 and 6 from the basis of the 3D checks.

CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPO- NENTS OR WIRING.

POWER TRANSFORMER REMOVAL

1.CARRY OUT 3D CHECKS.

2.Disconnect wire leads from power transformer, magnetron and capacitor terminals.

3.Remove four (4) screws holding transformer to bottom plate.

4.Remove transformer from bottom plate.

Re-install

1. Rest transformer on the bottom plate with its primary

terminals toward front side.

2.Secure the transformer with four (4) screws to bottom plate.

3.Re-connect wire leads (primary and high voltage) to power transformer and filament leads of transformer to magnetron and high voltage capacitor. Refer to

"PICTORIAL DIAGRAM".

4.Re-install outer case and check that oven is operating properly.

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Contents Table of Contents Microwave Oven Model R-480J480J Sharp Corporation OSAKA, Japan Microwave Oven480J General Important InformationProduct Specifications General InformationDescription This Appliance Must be EarthedAppearance View Touch Control PanelOperation Sequence OFF ConditionMicrowave Cooking Condition Variable CookingPower Output Reduction Cooking SequenceSensor Instant Reheat Function of Important Components Troubleshooting Guide ServicingRemember to Check 3D Remember to Check 4RTest Procedure Possible Cause Defective Parts ProblemTest Procedures Procedure Component Test Letter Magnetron TestMicrowave Output Power 1 litre water load Test Procedures Letter Component Test Power Transformer TestHigh Voltage Rectifier Assembly Test High Voltage Capacitor TestProcedure Component Test Letter Switch TestNoise Filter Test Carry OUT 3D Checks Thermal CUT-OUT TestTouch Control Panel Assembly Test Blown Fuse F10A Carry OUT 3D ChecksHigh Voltage Fuse Test KEY Unit Test Relay TestCarry OUT 3D Checks Steps Occurrence Cause or Correction OmifAH Sensor Test Checking the initial sensor cooking conditionTest Procedures Letter Testing Method for AH Sensor AND/OR Control UnitChecking Control Unit Sensor Dummy Resistor CircuitReset Circuit Indicator CircuitPower Source Circuit Synchronizing Signal CircuitLSI Pin No Signal Description Signal coming from touch keySignal similar to P17 Power source voltage GND0VCommon data signal COM8 Common data signal COM7Common data signal COM6 Common data signal COM5Absolute Humidity Sensor Circuit Structure of Absolute Humidity SensorOther Precautions Touch Control Panel ServicingShapes of Electronic Components Servicing of Touch Control PanelComponent Replacement and Adjustment Procedure Power Transformer RemovalOuter Case Removal Positive Lock Connector NO-CASE Type Removal HOW to RE-INSTALL the Turntable Motor CoverMagnetron Removal Turntable Motor RemovalControl Panel Assembly Removal CPU Unit and Power UnitInstallation Oven Lamp and Lamp Socket RemovalPower Supply Cord Replacement After adjustment, check the followingRear View Side ViewDoor Replacement RE-INSTALLRemoval View back side of door frameAfter any service, make sure of the following InstallationSealer Film Preparation for Testing Microwave MeasurementRequirement 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 C ZD1 SP1 VRB RY2CN a CN D D10 RY1 RY3 TTMParts List Packing and Accessories MiscellaneousSCREWS, 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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