Electrolux FMV156DBE service manual Touch Control Panel Assembly, Description of LSI, Lsi

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FMV156DBE

FMV156DSE

FMV156DQE

FMV156DCF

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 Control unit consists of LSI Unit and Power U nit)

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 P20, P21, P22, P25, and P26.

When a key pad is touched, a signal is completed through the key unit and passed back to the LSI through P43, P44, P45 and P46 to perform the function that was requested.

Control Unit

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

In addition, the synchronizing signal is available in order to compose a basic standard time in the clock circuit.

Symbol Voltage Application

VC -5.3V LSI(IC1)

3)Synchronizing Signal Circuit

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

4)Reset Circuit

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

5)Buzzer Circuit

The buzzer is 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, turntable motor, hood motor, and light the oven lamp and hood lamp.

8)Indicator Circuit

This circuit consists of 22 segments and 3 common electrodes using a Light Crystal Display.

9)Back Light Circuit

A circuit to drive the back light (Light emitting diodes LD1-LD4).

DESCRIPTION OF LSI

LSI

The I/O signal of the LSI is detailed in the following table.

Pin No.

Signal

I/O

Description

 

 

 

 

1-2

VL2-VL1

IN

Power source voltage input terminal.

 

 

 

Standard voltage for LCD.

3-6

AN7-AN4

IN

Terminal to change cooking input according to the Model.

 

 

 

By using the A/D converter contained in the LSI, DC voltage in accordance with the Model

 

 

 

in operation is applied to set up its cooking constant.

 

 

 

 

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Contents Over the Range Microwave Oven Models Table of ContentsBefore Servicing Dont Touch Before Servicing When the testing is completedRequirements Microwave Measurement ProcedureLeakage test Electrolux General Information Product SpecificationOven Diagram Control Panel Description of Operating Sequence OperationHorizontal Venting Vertical VentingRE-CIRCULATION Inside Venting Figure O-1. Oven Schematic-Off Condition Functions Description and Function of ComponentsTroubleshooting Guide CK = Check / RE = Replace Microwave Output Power Procedure Component Test Letter Magnetron Assembly TestPower Transformer Test High Voltage Capacitor Test Magnetron Temperature Fuse TestCavity Thermal CUT-OUT Test TEMPERATURE, Replace Temperature Fuse Procedure Component Test LetterPrimary Interlock Switch Test Door Sensing SwitchSecondary Interlock Relay RY2 Monitor Switch TestHood Thermal CUT-OUT Test ProcedureHood FAN Motor Test Before testing Relay Test KEY Unit Test Defrost Center Test Foil Pattern on the Printed Wiring Board Test 1ST Stage 2ND Stage Level TimeRemoval Occurrence Cause or CorrectionSteps Occurrence Cause or Correction Measuring Point Indication of OHM-METER Procedure Component Test Letter Noise Filter TestDescription of LSI Touch Control Panel AssemblyLSI OUT Oven lamp, fan motor and turntable motor driving signal Signal to sound buzzer 2.0 kHzSignal coming from touch key Signal similar to P46Hood lamp driving signal Key strobe signalHood motor driving signal Segment data signalServicing Other PrecautionsShapes of Electronic Components Servicing of Touch Control PanelHood Exhaust Louver Removal Component Replacement and Adjustment ProcedureRe-install Power Transformer RemovalPictorial Diagram Hood FAN Motor RemovalHigh Voltage Rectifier and High Voltage Capacitor Removal Magnetron RemovalHood FAN Thermal CUT-OUT Removal Thermal CUT-OUT Cavity RemovalCooling FAN Motor Removal InstallationSide View Control Panel ASSEMBLY, Control Unit and KEY Unit Removal Positive Lock Connector NO-CASE Type RemovalPositive lock connector Turntable MotorControl Unit and KEY Unit Removal Key unit locationDoor Assembly RE-INSTALL Door Replacementdoor Assembly RemovalDoor Frame Assembly Door DisassemblyChoke Cover Latch SPRING, Latch Head and Door PanelPictorial DiagramFigure S-2. Power Unit Circuit LSI Unit Circuit Figure S-4. Printed Wiring Board Electric Parts Parts ListCabinet Parts Control Panel PartsMiscellaneous Door PartsSCREWS,NUTS, Washers and Other Oven and Cabinet Parts Control Panel Parts Door Parts Miscellaneous Non-replaceable items Packing and AccessoriesFMV156DBE FMV156DSE FMV156DQE FMV156DCF FMV156DBE FMV156DSE FMV156DQE FMV156DCF FMV156DBE FMV156DSE FMV156DQE FMV156DCF
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