Sharp R-480J service manual Magnetron Removal, Turntable Motor Removal

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R-480J

MAGNETRON REMOVAL

Removal

1.CARRY OUT 3D CHECKS.

2.Disconnect wire leads from magnetron.

3.Remove the two (2) screws holding the magnetron air duct to magnetron. And slide magnetron air duct slightly so that two (2) screws at left hand side of magnetron appear.

4.Carefully remove the four (4) screws holding magnetron to waveguide flange.

5.Remove magnetron with care so that magnetron antenna is not hit by any metal object around antenna.

6.Now, the magnetron is free.

Re-install

1. Re-install the magnetron to waveguide flange with care

so that magnetron antenna is not hit by any metal object.

2.Secure the magnetron with four (4) screws.

3.Hold the magnetron air duct to the magnetron and secure the magnetron air duct with two (2) screws.

4.Re-connect the wire leads to the magnetron. Refer to

"PICTORIAL DIAGRAM".

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

CAUTION: WHEN REPLACING MAGNETRON, BE SURE THE R.F. GASKET IS IN PLACE AND MOUNTING SCREWS ARE TIGHTENED SECURELY

HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL

1.CARRY OUT 3D CHECKS.

2.Disconnect the wire lead from the fan motor.

3.Remove the fan duct from the oven cavity.

4.Remove two (2) screws holding the fan motor to the oven cavity back plate and remove it.

5.Disconnect the wire lead of high voltage rectifier assembly from the magnetron.

6.Disconnect high voltage fuse from the capacitor.

7.Disconnect filament lead of the power transformer from the capacitor.

8.Remove one (1) screw holding the capacitor holder to the bottom plate.

9.Remove one (1) screw holding high voltage rectifier assembly to the capacitor holder.

10.Remove the capacitor holder

11.Disconnect the high voltage rectifier assembly from capacitor.

12.Now, capacitor and rectifier assembly are free.

CAUTION: WHEN REPLACING HIGH VOLTAGE REC- TIFIER AND HIGH VOLTAGE CAPACITOR, GROUND SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY WITH A GROUNDING SCREW.

TURNTABLE MOTOR REMOVAL

1.Disconnect oven from power supply.

2.Remove turntable and turntable support from oven cavity.

3.Lay the oven on it's backside. Remove the turntable motor cover by snipping off the material in four portions.

4.Where the portions have been snipped off bend portions flat. No sharp edge must be evident after removal of the turntable motor cover.

5.Disconnect wire leads from turntable motor. (See "Positive lock connector removal")

6.Remove two (2) screws holding turntable motor to oven cavity.

7.Remove an o-ring and a washer from the turntable motor shaft.

8. Now the turntable motor is free.

HOW TO RE-INSTALL THE TURNTABLE MOTOR COVER

1.Remove the one (1) screw which is fixed on the bottom plate left near by the turntable motor cover. This screw will be used at the following step 3.

2.Insert the two (2) tabs of the turntable motor cover into the two (2) slits of the bottom plate left.

3.Hold the turntable motor cover to the bottom plate left with the one (1) screw which is prepared at the above step 1.

4.Now the turntable motor cover is re-installed.

POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL

Push the lever of positive lock® connector. Pull down on the positive lock® connector.

CAUTION: WHEN CONNECTING THE POSITIVE LOCK® CONNECTORS TO THE TERMINALS, IN- STALL THE POSITIVE LOCK® SO THAT THE LEVER FACES YOU (SERVICE PERSON).

Terminal

Positive lock® connector

1

Push

Lever

2

Pull down

Figure C-1 Positive lock®connector

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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 CookingCooking Sequence Power Output ReductionSensor Instant Reheat Function of Important Components Servicing Troubleshooting GuideRemember to Check 3D Remember to Check 4RProblem Test Procedure Possible Cause Defective PartsProcedure Component Test Letter Magnetron Test Test ProceduresMicrowave Output Power 1 litre water load 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 TestBlown Fuse F10A Carry OUT 3D Checks Touch Control Panel Assembly TestHigh Voltage Fuse Test 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 PanelPower Transformer Removal Component Replacement and Adjustment ProcedureOuter Case 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 frameInstallation After any service, make sure of the followingSealer Film 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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