Sharp R-480J service manual Test Procedure Possible Cause Defective Parts, Problem

Page 10

R-480J

TEST PROCEDURE

POSSIBLE CAUSE

AND

DEFECTIVE PARTS

CONDITION

PROBLEM

Home fuse blows when power supply cord is plugged into wall outlet.

FUSE F10A blows when power supply cord is plugged into wall outlet.

 

Display

does

not

show

OFF

anything

when

power

supply

CONDITION

cord is plugged into wall outlet.

 

Display does not operate properly when STOP/CLEAR pad is touched.

Oven lamp does not light at

door opened. (Display appears.)

Oven does not start when the START pad is touched. (Display appears)

Oven lamp does not light (Display appears.)

Fan motor does not operate. (Display appears.)

Turntable motor assembly does not operate. (Display appears.)

Oven or any electrical parts does not stop when cooking time is 0 or STOP/CLEAR pad is touched.

ON

Oven seems to be operating

CONDITION but little or no heat is produced

 

in oven

load.

(Microwave

 

power level is set at HIGH)

 

Oven does not seems to be

 

operating

properly when

 

MEDIUM

HIGH,

MEDIUM,

 

MEDIUM LOW or LOW is set.

 

(Oven operates properly at HIGH

 

and when the STOP/CLEAR pad

 

is touched the oven stops.)

 

Oven goes into cook cycle but

 

shuts down before end of

 

cooking cycle.

 

 

Oven stops as soon as when

 

the START pad is touched.

 

AH sensor does not end during

 

Sensor

Cooking

condition.

SENSOR

(Oven does not shut off after a

cup of water is boiling by sensor

COOKING

 

 

 

CONDITION cooking.)

 

 

 

Oven stops at 16 sec. after

 

starting.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CK = Check / RE = Replace

A

 

B

 

C

 

D

 

E

 

E

 

E

 

F

 

G

 

G

 

H

 

H

 

I

 

J

 

K

 

L

 

M

 

N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RE

RE

CK

CK

CK

CK

CK

CK

CK

CK

O

MAGNETRON

 

POWER TRANSFORMER

 

H.V. RECTIFIER ASSEMBLY

 

HIGH VOLTAGE CAPACITOR

 

1ST. LATCH SWITCH

 

2ND. N D. INTERLOCK RELAY CONTROL SWITCH

 

MONITOR SWITCH

 

NOISE FILTER

 

THERMAL CUT-OUT (MAGNETRON)

 

THERMAL CUT-OUT (OVEN)

 

FAN MOTOR

 

TURNTABLE MOTOR

 

FUSE F10A

 

HIGH VOLTAGE FUSE

 

TOUCH CONTROL PANEL

 

KEY UNIT

 

RELAY (RY-1, RY-2)

 

FOIL PATERN ON P.W.B.

POWER SUPPLY CORD

OVEN LAMP OR SOCKET

SHORTED WIRE HARNESS

OPENED WIRE HARNESS

WALL OUTLET

HOME FUSE OR BREAKER

WRONG OPERATION

MISADJUSTMENT SWITCH

BLOCKED COOLING FAN

BLOCKED VENTILATION OPENING

AH SENSOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

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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 CookingCooking Sequence Power Output ReductionSensor Instant Reheat Function of Important Components Remember to Check 3D Troubleshooting GuideServicing Remember to Check 4RTest Procedure Possible Cause Defective Parts ProblemProcedure Component Test Letter Magnetron Test Test ProceduresMicrowave 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 TestBlown Fuse F10A Carry OUT 3D Checks Touch Control Panel Assembly TestHigh 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 PanelPower Transformer Removal Component Replacement and Adjustment ProcedureOuter 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 frameInstallation After any service, make sure of the followingSealer 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.