Sharp R-1481, R-1480, R-1482 service manual Touch Control Panel Assembly

Page 23

R-1480

R-1481

R-1482

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

The touch control section consists of the following units as shown in the touch control panel circuit.

(1)Key Unit

(2)Control Unit

The principal functions of these units and the signals com- municated among them are explained below.

Key Unit

The key unit is composed of a matrix, signals generated in the LSI are sent to the key unit through P00 - P07.

When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through R24 - R27 to perform the function that was requested.

Control Unit

Control unit consists of LSI, power source circuit, synchro- nizing signal circuit, ACL circuit, buzzer circuit, relay circuit and indicator circuit.

1)LSI

This LSI controls the key strobe signal, relay driving signal for oven function and indicator signal.

2)Power Source Circuit

This circuit generates voltages necessary for the control unit from the AC line voltage.

Symbol

Voltage

Application

 

 

 

VC

-5.1V

LSI(IC1)

VP

-28V

Fluorescent display tube : Grid

 

 

and anode voltage

3)Synchronizing Signal Circuit

The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit. It incorporates a very small error because it works on commercial frequency.

4)ACL Circuit

A circuit to generate a signals which resetting the LSI to the initial state when power is applied.

5)Buzzer Circuit

The buzzer responds to signals from the LSI to emit audible sounds (key touch sound and completion sound).

6)Door Sensing Switch

A switch to inform the LSI if the door is open or closed.

7)Relay Circuit

To drive the magnetron, fan motor, stirrer motor, turnta- ble motor, hood motor, and light the oven lamp and hood lamp.

8)Indicator Circuit

Indicator element is a Fluorescent Display.

Basically, a Fluorescent Display is a triode having a cathode, a grid and an anode. Usually, the cathode of a Fluorescent Display is directly heated and the filament serves as cathode.

The Fluorescent Display has 8-digits, 15-segments are used for displaying figures.

VF1-VF2 2.7Vac

Filament of fluorescent dis-

 

play tube

 

(VF1 to VF2 voltage)

 

 

21

Page 22 Page 24
Image 23
Page 22 Page 24
Contents Over the Range Microwave Oven Table of ContentsBefore Servicing Dont Touch Before Servicing When the testing is completedLeakage test Microwave Measurement ProcedureRequirements Foreword Sharp PLAZA, MahwahOver the Range Microwave Oven 1480 / R-1481 / R-1482Grounding Instructions Product SpecificationGeneral Information DescriptionOven Diagram Cooking Condition OperationDescription of Operating Sequence OFF ConditionCompu Defrost Cooking Power Level P-0 to P-90 CookingCompu Cook Horizontal Venting Ventilation Methods HOT AIR ExhaustVertical Venting AIR FlowFigure O-1. Oven Schematic-Off Condition Description and Function of Components Hood Lamp Troubleshooting GuideStirrer Motor Possible Case Defective Parts Power Transformer Test Test ProceduresProcedure Letter Component Test Magnetron Assembly Test Microwave Output PowerHigh Voltage Capacitor Test Procedure Letter Component TestMagnetron Temperature Fuse Test High Voltage Rectifier TestPrimary Interlock Relay RY2 Secondary Interlock Switch TestPrimary Interlock System Test Door Sensing Switch Monitor Switch TestHood FAN Motor Test Blown Monitor Fuse TestHood Thermal CUT-OUT Test WHT 3 Touch Control Panel Assembly TestBefore testing KEY Unit Test Compu Defrost Test Procedure Letter Component Test Relay TestWeight 1ST Stage 2ND Stage 3RD Stage 4TH Stage Level Time Foil Pattern on the Printed Wiring Board TestSteps Occurrence Cause or Correction Procedure Component Test LetterOccurrence Cause or Correction Touch Control Panel Assembly LSIIZA876DR Description of LSIDigit selection signal Signal to sound buzzerSignal coming from touch key Signal similar to P27Key strobe signal Segment data signalsSegment data signal Servicing of Touch Control Panel Other PrecautionsServicing Shapes of Electronic ComponentsHood Exhaust Louver Removal Component Replacement and Adjustment ProcedureHood FAN MOTOR, Hood Duct and Oven Lamp Socket Removal Power Transformer RemovalRe-install Outer Case RemovalThermal CUT-OUT Cavity Removal Magnetron RemovalHigh Voltage Rectifier and High Voltage Capacitor Removal Hood FAN Thermal CUT-OUT RemovalRear View Temperature Fuse Magnetron RemovalCooling FAN Motor Removal Stirrer Motor Removal Stirrer Cover and Stirrer FAN InstallationControl Panel ASSEMBLY, Control Unit and KEY Unit Removal Turntable Motor RemovalStep Positive Lock Connector NO-CASE Type RemovalPositive lock connector Door Assembly RE-INSTALL Door ReplacementAfter adjustment, check the following Door Assembly RemovalDoor Frame Door DisassemblyAfter any servicing, make sure of the following Choke CoverFigure S-1. Pictorial Diagram Circuit BFB DIPCabinet Parts Parts ListParts marked * are used in voltage more than Electric PartsDoor Parts Oven PartsModel Number HOW to Order Replacement PartsMiscellaneous SCREWS,NUTS and WashersOven 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.
Top Page Image Contents