Sharp R-1480, R-1482, R-1481 Procedure Letter Component Test Relay Test, Compu Defrost Test

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R-1480

R-1481

R-1482

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

NRELAY 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.

4.Disconnect the leads to the primary of the power transformer.

5.Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.

6.After that procedure, re-connect the power supply cord.

7.Remove the outer case and check voltage between Pin No. 7 of the 4 pin connector (A) and the common terminal of the relay RY1 on the control unit with an A.C. voltmeter.

The meter should indicate 120 volts, if not check oven circuit.

RY1 and RY2 Relay Test

These relays are operated by D.C. voltage

Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation. DC. voltage indicated ................... Defective relay.

DC. voltage not indicated ............. Check diode which is connected to the relay coil. If diode is

good, control unit is defective.

 

 

RELAY SYMBOL

 

OPERATIONAL VOLTAGE

 

 

CONNECTED COMPONENTS

 

 

 

 

RY1

 

 

Approx. 24.0V D.C.

 

 

Oven lamp / Fan motor / Stirrer motor

 

 

 

 

 

 

RY2(COOK)

 

 

Approx. 24.0V D.C.

 

 

Power transformer

 

 

 

 

 

 

 

 

RY3

 

 

Approx. 24.0V D.C.

 

 

Turntable motor

 

 

 

 

 

 

 

 

RY4

 

 

Approx. 24.0V D.C.

 

 

Hood motor

 

 

 

 

 

 

 

 

RY5

 

 

Approx. 24.0V D.C.

 

 

Hood motor (HIGH /LOW selection)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

9.Open the door and block it open.

 

 

 

 

 

 

 

 

 

 

 

 

 

10.Discharge high voltage capacitor.

 

 

 

 

 

 

 

 

 

 

 

 

 

11.Reconnect all leads removed from components during testing.

 

 

 

 

 

 

 

 

12.Re-install the outer case (cabinet).

 

 

 

 

 

 

 

 

 

 

 

 

 

13.Reconnect the power supply cord after the outer case is installed.

 

 

 

 

 

 

 

14.Run the oven and check all functions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O

COMPU DEFROST TEST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1) Place one cup of water in the center of the turntable tray in the oven cavity.

 

 

 

 

 

(2) Close the door, touch the " COMPU DEFROST " pad once and touch the Number pad "1" and touch

 

 

the Number pad "5". And then touch the "START" pad.

 

 

 

 

 

 

 

 

(3) The oven is in Compu Defrost cooking condition.

 

 

 

 

 

 

 

 

 

(4) The oven will operate as follows

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WEIGHT

 

1ST STAGE

 

2ND STAGE

3RD STAGE

4TH STAGE

 

 

 

 

 

LEVEL

TIME

 

LEVEL

 

TIME

LEVEL

TIME

LEVEL

 

TIME

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.5lbs

 

70%

35sec.

 

0%

 

40sec.

50%

30sec.

30%

 

35sec.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(5) If improper operation is indicated, the control unit is probably defective and should be checked.

 

 

 

 

 

 

 

 

 

P

FOIL PATTERN ON THE PRINTED WIRING BOARD TEST

 

 

 

 

 

 

 

 

To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on

 

the PWB, this foil pattern acts as a fuse.

 

 

 

 

 

 

 

 

 

 

 

1. Foil pattern check and repairs.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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) Follow the troubleshooting guide given below for repair.

 

 

 

 

 

 

 

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Contents Over the Range Microwave Oven Table of ContentsBefore Servicing Dont Touch Before Servicing When the testing is completedMicrowave Measurement Procedure RequirementsLeakage test Over the Range Microwave Oven Sharp PLAZA, Mahwah1480 / R-1481 / R-1482 ForewordGeneral Information Product SpecificationDescription Grounding InstructionsOven Diagram Description of Operating Sequence OperationOFF Condition Cooking ConditionPower Level P-0 to P-90 Cooking Compu CookCompu Defrost Cooking Vertical Venting Ventilation Methods HOT AIR ExhaustAIR Flow Horizontal VentingFigure O-1. Oven Schematic-Off Condition Description and Function of Components Troubleshooting Guide Stirrer MotorHood Lamp Possible Case Defective Parts Procedure Letter Component Test Magnetron Assembly Test Test ProceduresMicrowave Output Power Power Transformer TestMagnetron Temperature Fuse Test Procedure Letter Component TestHigh Voltage Rectifier Test High Voltage Capacitor TestPrimary Interlock System Test Door Sensing Switch Secondary Interlock Switch TestMonitor Switch Test Primary Interlock Relay RY2Blown Monitor Fuse Test Hood Thermal CUT-OUT TestHood FAN Motor Test Touch Control Panel Assembly Test Before testingWHT 3 KEY Unit Test Weight 1ST Stage 2ND Stage 3RD Stage 4TH Stage Level Time Procedure Letter Component Test Relay TestFoil Pattern on the Printed Wiring Board Test Compu Defrost TestProcedure Component Test Letter Occurrence Cause or CorrectionSteps Occurrence Cause or Correction Touch Control Panel Assembly LSIIZA876DR Description of LSISignal coming from touch key Signal to sound buzzerSignal similar to P27 Digit selection signalSegment data signals Segment data signalKey strobe signal Servicing Other PrecautionsShapes of Electronic Components Servicing of Touch Control PanelHood Exhaust Louver Removal Component Replacement and Adjustment ProcedureRe-install Power Transformer RemovalOuter Case Removal Hood FAN MOTOR, Hood Duct and Oven Lamp Socket RemovalHigh Voltage Rectifier and High Voltage Capacitor Removal Magnetron RemovalHood FAN Thermal CUT-OUT Removal Thermal CUT-OUT Cavity RemovalTemperature Fuse Magnetron Removal Cooling FAN Motor RemovalRear View Control Panel ASSEMBLY, Control Unit and KEY Unit Removal Stirrer Cover and Stirrer FAN InstallationTurntable Motor Removal Stirrer Motor RemovalPositive Lock Connector NO-CASE Type Removal Positive lock connectorStep After adjustment, check the following Door ReplacementDoor Assembly Removal Door Assembly RE-INSTALLAfter any servicing, make sure of the following Door DisassemblyChoke Cover Door FrameFigure S-1. Pictorial Diagram Circuit BFB DIPParts marked * are used in voltage more than Parts ListElectric Parts Cabinet PartsDoor Parts Oven PartsMiscellaneous HOW to Order Replacement PartsSCREWS,NUTS and Washers Model NumberOven and Cabinet Parts Control Panel Parts Door Parts Miscellaneous Copyright 1998 by Sharp Corporation ALL Rights Reserved Packing and Accessories

R-1481, R-1482, R-1480 specifications

Sharp R-1480, R-1481, and R-1482 are popular countertop microwave ovens that exemplify innovation in home cooking technology. These models are designed to cater to modern culinary needs, combining functionality, efficiency, and user-friendly features.

The Sharp R-1480 stands out with its powerful 900 watts of cooking power, ensuring that meals are cooked evenly and thoroughly. This model includes a spacious 1.5 cubic feet capacity, allowing users to cook larger dishes without hassle. One of the most striking features of the R-1480 is its advanced Sensor Cooking technology. This intelligent feature automatically adjusts cooking time and power levels based on the type of food being prepared, delivering optimal results with minimal effort.

The R-1481 model shares many similarities with the R-1480 but introduces additional features that enhance convenience and usability. It also boasts a 900-watt power output and a 1.5 cubic feet interior. What sets the R-1481 apart is its impressive variety of pre-programmed settings. These settings simplify cooking tasks, giving users one-touch access to options for popular foods such as popcorn, pizza, and frozen vegetables. The auto defrost function is another advantage, allowing for quick thawing of meats and seafood based on weight.

Meanwhile, the Sharp R-1482 takes the features of the R-1481 a step further, adding a few unique characteristics. This model incorporates both microwave and grill functionality, allowing for versatile cooking options. Users can enjoy the benefits of grilling their favorite dishes for a perfect finish and flavor infusion. The R-1482 also includes a user-friendly control panel with a large LCD display, ensuring easy navigation through the cooking process.

Across these models, Sharp emphasizes safety and ease of use. The child lock feature provides peace of mind for families, while the easy-to-clean stainless steel interior promotes hygiene and longevity. All models include a turntable for even cooking and reheating, making it easier to prepare meals uniformly.

In conclusion, the Sharp R-1480, R-1481, and R-1482 microwave ovens combine advanced technology with practical features, catering to a diverse range of cooking needs. These models stand as a testament to Sharp’s commitment to quality and innovation in the kitchen, making them excellent choices for anyone seeking efficiency and versatility in their cooking appliances.
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