Sharp R-1482, R-1480, R-1481 Procedure Letter Component Test, High Voltage Rectifier Test

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R-1480

R-1481

R-1482

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.)

CHIGH VOLTAGE RECTIFIER 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.Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading. If a short is indicated in both directions, or if an infinite resistance is read in both directions, the rectifier is probably defective and should be replaced.

5.Reconnect all leads removed from components during testing.

6.Reinstall the outer case (cabinet).

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

8.Run the oven and check all functions.

NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts.

DHIGH VOLTAGE CAPACITOR 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.If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and check for short or open between the terminals using an ohmmeter.

Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate continuity for a short time and should indicate an open circuit once the capacitor is charged. If the above is not the case, check the capacitor with an ohmmeter to see if it is shorted between either of the terminals and case. If it is shorted, replace the capacitor.

5.Reconnect all leads removed from components during testing.

6.Reinstall the outer case (cabinet).

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

8.Run the oven and check all functions.

ECAVITY THERMAL CUT-OUT 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.A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the temperature of the thermal cut-out reaches approximately 293˚F(145˚C).

An open thermal cut-out indicates overheating of the oven, exchange the oven thermal cut-out and check inside of oven cavity and for improper setting of cooking time or operation of control unit. Check for restricted air flow through the vent holes of the oven cavity, especially the cooling fan and air guide.

5.Reconnect all leads removed from components during testing.

6.Reinstall the outer case (cabinet).

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

8.Run the oven and check all functions.

MAGNETRON TEMPERATURE FUSE 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.A continuity check across the temperature fuse terminals should indicate a closed circuit. If the temperature of the magnetron reaches approximately 302˚F(150˚C), the temperature fuse opens. An open temperature fuse indicates overheating of the magnetron. Check for restricted air flow to the magnetron, especially the cooling fan air guide.

5.Reconnect all leads removed from components during testing.

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Contents Table of Contents Over the Range Microwave OvenBefore Servicing When the testing is completed Dont Touch Before ServicingRequirements Microwave Measurement ProcedureLeakage test Sharp PLAZA, Mahwah Over the Range Microwave Oven1480 / R-1481 / R-1482 ForewordProduct Specification General InformationDescription Grounding InstructionsOven Diagram Operation Description of Operating SequenceOFF Condition Cooking ConditionCompu Cook Power Level P-0 to P-90 CookingCompu Defrost Cooking Ventilation Methods HOT AIR Exhaust Vertical VentingAIR Flow Horizontal VentingFigure O-1. Oven Schematic-Off Condition Description and Function of Components Stirrer Motor Troubleshooting GuideHood Lamp Possible Case Defective Parts Test Procedures Procedure Letter Component Test Magnetron Assembly TestMicrowave Output Power Power Transformer TestProcedure Letter Component Test Magnetron Temperature Fuse TestHigh Voltage Rectifier Test High Voltage Capacitor TestSecondary Interlock Switch Test Primary Interlock System Test Door Sensing SwitchMonitor Switch Test Primary Interlock Relay RY2Hood Thermal CUT-OUT Test Blown Monitor Fuse TestHood FAN Motor Test Before testing Touch Control Panel Assembly TestWHT 3 KEY Unit Test Procedure Letter Component Test Relay Test Weight 1ST Stage 2ND Stage 3RD Stage 4TH Stage Level TimeFoil Pattern on the Printed Wiring Board Test Compu Defrost TestOccurrence Cause or Correction Procedure Component Test LetterSteps Occurrence Cause or Correction Touch Control Panel Assembly Description of LSI LSIIZA876DRSignal to sound buzzer Signal coming from touch keySignal similar to P27 Digit selection signalSegment data signal Segment data signalsKey strobe signal Other Precautions ServicingShapes of Electronic Components Servicing of Touch Control PanelComponent Replacement and Adjustment Procedure Hood Exhaust Louver RemovalPower Transformer Removal Re-installOuter Case Removal Hood FAN MOTOR, Hood Duct and Oven Lamp Socket RemovalMagnetron Removal High Voltage Rectifier and High Voltage Capacitor RemovalHood FAN Thermal CUT-OUT Removal Thermal CUT-OUT Cavity RemovalCooling FAN Motor Removal Temperature Fuse Magnetron RemovalRear View Stirrer Cover and Stirrer FAN Installation Control Panel ASSEMBLY, Control Unit and KEY Unit RemovalTurntable Motor Removal Stirrer Motor RemovalPositive lock connector Positive Lock Connector NO-CASE Type RemovalStep Door Replacement After adjustment, check the followingDoor Assembly Removal Door Assembly RE-INSTALLDoor Disassembly After any servicing, make sure of the followingChoke Cover Door FrameFigure S-1. Pictorial Diagram Circuit DIP BFBParts List Parts marked * are used in voltage more thanElectric Parts Cabinet PartsOven Parts Door PartsHOW to Order Replacement Parts MiscellaneousSCREWS,NUTS and Washers Model NumberOven and Cabinet Parts Control Panel Parts Door Parts Miscellaneous Packing and Accessories Copyright 1998 by Sharp Corporation ALL Rights Reserved

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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