Sharp R-520LK Test Procedures, Problem, Procedure Component Test Letter Magnetron Assembly Test

Page 13

R - 5 2 0 L K

R-520LW

CK = Check / RE = Replace

TEST PROCEDURE

RE

RE

A

B

C

D

E

E

F

F

G

H

RE

RE

CK

I

CK

CK

CK

J

K

L

M

N

CONDITION

PROBLEM

SHORT IN POWER CORD

SHORT OR OPENED WIRING

MAGNETRON

POWER TRANSFORMER

H.V. RECTIFIER ASSEMBLY

HIGH VOLTAGE CAPACITOR

CAVITY TEMPERATURE FUSE

MAGNETRON TEMP FUSE

SECONDARY INTERLOCK SYSTEM

PRIMARY INTERLOCK SWITCH

MONITOR SWITCH

MONITOR FUSE

OVEN LAMP OR SOCKET

COOLING FAN MOTOR

TURNTABLE MOTOR

TOUCH CONTROL PANEL

WRONG OPERATION

LOW VOLTAGE

DIRTY OVEN CAVITY

KEY UNIT

RELAY (RY1)

COMPU DEFROST

FOIL PATTERN ON PWB.

AH SENSOR

POSSIBLECAUSE AND DEFECTIVEPARTS

Home fuse or circuit breaker blows

when power cord is plugged into wall

receptacle

C/T fuse blows when power cord is

OFF

plugged into wall receptacle.

All letters and indicators do not ap-

CONDITION

pear in display when power cord is

first plugged into wall outlet.

Display does not operate properly

when STOP/CLEAR key is touched.

(Buzzer should sound and ":" or time

of day should appear in display.)

Oven lamp does not light when door

is opened.

Oven lamp does not go out when

door is closed.

Oven lamp lights but fan motor and

turntable motor do not operate.

Oven does not go into cook cycle

when START pad is touched

Oven seems to be operating but little

or no heat is produced in oven load.

(Food incompletely cooked or not

cooked at all at end of cook cycle.)

COOKING

Oven goes into a cook cycle but ex-

CONDITION

tremely uneven heating is produced

in oven load (food).

Oven does not cook properly when

programmed for Cooking Power P-50

mode.(Operates properly on Cooking

P-HI (HIGH) mode.)

Oven goes into COMPU DEFROST

but food is not defrosted well.

SENSOR

AH sensor does not end during

sensor cooking condition. (Oven

COOKING

does not shut off after a cup of

CONDITION

water is boiling by sensor cooking)

Oven stops at 16 sec. after starting.

TEST PROCEDURES

	PROCEDURE	COMPONENT TEST
	LETTER	COMPONENT TEST
	LETTER

AMAGNETRON ASSEMBLY TEST

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

2.Open the door and block it open.

3.Discharge high voltage capacitor.

13

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Contents 520LW Table of ContentsBefore Servicing Dont Touch Before Servicing When the testing is completedRequirements Microwave Measurement ProcedureLeakage test Microwave Ovens Sharp PLAZA, Mahwah520LK/R-520LW ForewordGeneral Information SpecificationDescription Grounding InstructionsTouch Control Panel Oven DiagramOperation Power Level P-0 to P-90 CookingDescription of Operating Sequence OFF ConditionMicrowave Sensor Cooking ConditionClock Appears on Display SchematicDescription and Function of Components Troubleshooting Guide Test Procedure Test ProceduresProblem Procedure Component Test Letter Magnetron Assembly TestMicrowave Output Power Procedure Component Test LetterPower Transformer Test Cavity Temperature Fuse Test Procedure Component Test Letter High Voltage Rectifier TestMagnetron Temperature Fuse Test High Voltage Capacitor TestPrimary Interlock Switch Test Replace Temperature FuseRun the oven and check all functions Secondary Interlock System TestTouch Control Panel Assembly Test Procedure Component Test Letter Monitor Switch TestKEY Unit Test Figure of all digits flickerCompu Defrost Test Relay TestMenu 1ST Stage 2ND Stage 3RD Stage STEAKS/CHOPS Level Time Steps Occurrence Cause or Correction Primary on the PWB, this foil pattern acts as a fuseAH Sensor Test Testing Method for AH Sensor AND/OR Control UnitChecking the initial sensor cooking condition R1, R2 22Ω ± 1% 1/2W R3 4.3Ω ± 5% 1/4W R4 1MΩ ± 5% 1/4W Checking Control UnitSensor Dummy Resistor Circuit Indicator Circuit Reset CircuitPower Source Circuit Synchronizing Signal CircuitLSI Description of LSIInternal clock oscillation frequency control input setting Signal similar to ANI3Power source voltage Key strobe signalConverter power source voltage Converter power source voltage GND0VCommon data signal Structure of Absolute Humidity Sensor Absolute Humidity Sensor CircuitOperational Principle of Absolute Humidity Sensor Detector Circuit of Absolute Humidity Sensor CircuitTouch Control Panel Servicing Other PrecautionsServicing of Touch Control Panel Servicing ToolsOuter Case Removal Component Replacement and Adjustment ProcedureTo prevent an electric shock, take the following pre Re-install Power Transformer RemovalHigh Voltage Rectifier and High Voltage Capacitor Removal Magnetron RemovalControl Panel Assembly Removal Positive Lock Connector NO-CASE Type RemovalGraphic Sheet and Membrane Switch Replacement Oven Lamp and Lamp Socket RemovalTurntable Motor Removal InstallationCooling FAN Motor Removal InstallationRemoval Rear ViewAfter adjustment, check the following Door ReplacementAfter any service, make sure of the following RE-INSTALLSealer Film High Voltage Components DiagramCircuit Control Unit Figure S-5 . Printed Wiring Board of Power Unit Parts List Miscellaneous HOW to Order Replacement PartsSCREWS,NUTS and Washers 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.