Sharp R-520LW, R-520LK service manual Power Transformer Removal, Magnetron Removal, Re-install

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R - 5 2 0 L K

R-520LW

CAUTION: 1. Disconnect oven from power sup- ply before removing outer case.

2.DISCHARGE THE HIGH VOLTAGE CA- PACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.

NOTE: When replacing the outer case, the 2 special Torx screws must be reinstalled in the same locations.

Special screw

Screw Driver

(Type: TORX T20 H or GTXH20-100)

POWER TRANSFORMER REMOVAL

1.Disconnect the power supply cord and then remove outer case.

2.Open the oven door and block it open.

3.Discharge high voltage capacitor.

4.Disconnect wire leads (primary and high voltage) from power transformer and the filament leads from the magnetron and capacitor terminals.

5.Remove two (2) screws holding transformer to bottom plate.

6.Remove transformer from bottom plate.

Re-install

1.Rest transformer on the bottom plate with its primary terminals toward the oven face plate.

2.Secure transformer with four 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" on page 30.

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

HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL

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 high voltage wire A from the high voltage capacitor.

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

6.Disconnect the filament lead (short one) of the power transformer from the high voltage capacitor.

7.Remove one (1) screw holding capacitor holder with the high voltage rectifier to the base plate.

8.Disconnect rectifier terminal from capacitor. High voltage rectifier assembly is now free.

9.Remove capacitor holder. Capacitor is now 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.

MAGNETRON REMOVAL

Removal

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 wire leads from magnetron.

5.Remove the two (2) screws holding the chassis support to the magnetron and the oven cavity front flange.

6.Slide the magnetron duct slightly so that the two (2) screws at left hand side of the magnetron appear.

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

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

9.Now, the magnetron is free.

Re-install

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

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

3.Hold the chassis support to the oven cavity front plate and the magnetron with the two (2) screws.

4.Reconnect the wire leads to the magnetron. Refer to "PICTORIAL DIAGRAM" on page 30.

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 MOUNT- ING SCREWS ARE TIGHTENED SECURELY

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Contents Table of Contents 520LWBefore Servicing When the testing is completed Dont Touch Before ServicingMicrowave Measurement Procedure RequirementsLeakage test 520LK/R-520LW Sharp PLAZA, MahwahMicrowave Ovens ForewordDescription SpecificationGeneral Information Grounding InstructionsOven Diagram Touch Control PanelDescription of Operating Sequence Power Level P-0 to P-90 CookingOperation OFF ConditionSensor Cooking Condition MicrowaveSchematic Clock Appears on DisplayDescription and Function of Components Troubleshooting Guide Problem Test ProceduresTest Procedure Procedure Component Test Letter Magnetron Assembly TestProcedure Component Test Letter Microwave Output PowerPower Transformer Test Magnetron Temperature Fuse Test Procedure Component Test Letter High Voltage Rectifier TestCavity Temperature Fuse Test High Voltage Capacitor TestRun the oven and check all functions Replace Temperature FusePrimary Interlock Switch Test Secondary Interlock System TestProcedure Component Test Letter Monitor Switch Test Touch Control Panel Assembly TestFigure of all digits flicker KEY Unit TestRelay Test Compu Defrost TestMenu 1ST Stage 2ND Stage 3RD Stage STEAKS/CHOPS Level Time Primary on the PWB, this foil pattern acts as a fuse Steps Occurrence Cause or CorrectionTesting 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 Power Source Circuit Reset CircuitIndicator Circuit Synchronizing Signal CircuitDescription of LSI LSIPower source voltage Signal similar to ANI3Internal clock oscillation frequency control input setting Key strobe signalConverter power source voltage GND0V Converter power source voltageCommon data signal Operational Principle of Absolute Humidity Sensor Absolute Humidity Sensor CircuitStructure of Absolute Humidity Sensor Detector Circuit of Absolute Humidity Sensor CircuitServicing of Touch Control Panel Other PrecautionsTouch Control Panel Servicing Servicing ToolsComponent Replacement and Adjustment Procedure Outer Case RemovalTo prevent an electric shock, take the following pre High Voltage Rectifier and High Voltage Capacitor Removal Power Transformer RemovalRe-install Magnetron RemovalGraphic Sheet and Membrane Switch Replacement Positive Lock Connector NO-CASE Type RemovalControl Panel Assembly Removal Oven Lamp and Lamp Socket RemovalInstallation Turntable Motor RemovalRemoval InstallationCooling FAN Motor Removal Rear ViewDoor Replacement After adjustment, check the followingRE-INSTALL After any service, make sure of the followingSealer Film Diagram High Voltage ComponentsCircuit Control Unit Figure S-5 . Printed Wiring Board of Power Unit Parts List SCREWS,NUTS and Washers HOW to Order Replacement PartsMiscellaneous 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.

One of the defining characteristics of both the R-520LW and R-520LK is their powerful 900-watt output, which allows for speedy cooking and reheating. This high wattage ensures that food is cooked evenly and retains its moisture, preventing the common issue of dry or unevenly heated meals. Furthermore, the inclusion of multiple cooking power levels provides users with flexibility, making it easy to select the ideal setting for various types of food.

Both models feature Sharp's signature Inverter Technology. Unlike traditional microwaves that use a turn-on and turn-off cycling method, inverter technology delivers a steady stream of cooking power. This results in more consistent heating, allowing delicate foods such as fish or custards to be cooked perfectly without overcooking the edges. This technology not only enhances the quality of cooked food but also improves the overall efficiency of the microwave.

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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