Electrolux FMV156DBE service manual Description and Function of Components, Functions

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FMV156DBE

FMV156DSE

FMV156DQE

FMV156DCF

DESCRIPTION AND FUNCTION OF COMPONENTS

DOOR OPEN MECHANISM

The door is opened by pulling the door handle, refer to the Figure D-1.

 

Latch heads

 

Latch hook

 

Door sensing

Door

switch

 

 

Monitor switch

Primary interlock switch

Figure D-1. Door Open Mechanism

DOOR SENSING SWITCH, PRIMARY INTERLOCK SWITCH

The primary interlock switch is mounted in the lower position of the latch hook, the door sensing switch in the primary interlock system is mounted in the upper position of the latch hook is mounted on upper position of the latch hook. They are activated by the latch heads on the door. When the door is opened, the switches interrupt the circuit to all components. A cook cycle cannot take place until the door is firmly closed thereby activating both interlock switches. The primary interlock system consists of the door sensing switch and secondary interlock relay located on the control circuit board.

MONITOR SWITCH

The monitor switch is activated (the contacts opened) by the latch head on the door while the door is closed. The switch is intended to render the oven inoperative, by means of blowing the monitor fuse, when the contacts of the second- ary interlock relay (RY2) and primary interlock switch fail to open when the door is opened.

Functions:

1.When the door is opened, the monitor switch contact close (to the ON condition) due to their being normally closed. At this time the secondary interlock relay (RY2), primary interlock switch are in the OFF condition (contacts open) due to their being normally open contact switches. And the contacts of relay (RY1) are in the ON condition (contacts close).

2.As the door goes to a closed position, the monitor switch contacts are first opened and then the door sensing switch and the primary interlock switch contacts close. (On opening the door, each of these switches operate inversely.)

3.If the door is opened, and the secondary interlock relay (RY2) and primary interlock switch contacts fail to open, the monitor fuse blows simultaneously with closing of the

CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE DOOR SENSING SWITCH, SECONDARY INTERLOCK RELAY (RY2), RE- LAY (RY1), PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE").

NOTE: MONITOR FUSE AND MONITOR SWITCH ARE REPLACED AS AN ASSEMBLY.

THERMAL CUT-OUT (HOOD )

This thermal cut-out located on the right base plate. It is designed to automatically turn on the hood fan motor whenever the hot air rising from the conventional range below causes the temperature at the thermal cut-out to rise to 140OF (60OC) or higher, thus removing this hot air from around microwave oven. When the temperature around the thermal cut-out drops to 113OF (45OC) or lower, the thermal cut-out shuts off the hood fan motor.

THERMAL CUT-OUT (CAVITY )

This thermal cut-out is located on the top of the oven cavity. It is designed to prevent damage to the oven unit if the food in the oven catches fire due to overheating produced by improper setting of cooking time or failure of control unit.

Under normal operation, the thermal cut-out remains closed. However, the thermal cut-out will open at 293OF (145OC) causing the oven to shut down.

TURNTABLE MOTOR

The turntable motor rotates the turntable located on the bottom of the oven cavity, so that the foods on the turnta- ble cook evenly during cooking. Turntable will turn in either direction.The turntable motor can be turned off by touching TURNTABLE ON/OFF pad.

COOLING FAN MOTOR

The cooling fan motor drives a blade which draws external cool air. This cool air is directed through the air vanes sur- rounding the magnetron and cools the magnetron.This air is

channelled through the oven cavity to remove steam and vapors given off from the heating foods. It is then exhausted

through the exhausting air vents at the oven cavity.

HOOD FAN MOTOR

The hood fan motor is a one-speed, single-phase, double pole induction type, requiring a hood fan capacitor. It is located outside the upper rear part of the oven cavity, is to remove, from around the oven, hot air rising from the conventional electric or gas range over which it is installed.

This air is then expelled either vertically or horizontally through the customer supplied duct system, or discharged

back into the kitchen.

HOOD LAMP

The hood lamps are mounted at the hood lamp angle on the base cover. The hood lamps can be turned off and on

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Contents Table of Contents Over the Range Microwave Oven ModelsBefore Servicing When the testing is completed Dont Touch Before ServicingMicrowave Measurement Procedure RequirementsLeakage test Electrolux Product Specification General InformationOven Diagram Control Panel Operation Description of Operating SequenceVertical Venting Horizontal VentingRE-CIRCULATION Inside Venting Figure O-1. Oven Schematic-Off Condition Description and Function of Components FunctionsTroubleshooting Guide CK = Check / RE = Replace Procedure Component Test Letter Magnetron Assembly Test Microwave Output PowerPower Transformer Test Magnetron Temperature Fuse Test High Voltage Capacitor TestCavity Thermal CUT-OUT Test Procedure Component Test Letter TEMPERATURE, Replace Temperature FusePrimary Interlock Switch Test Door Sensing SwitchMonitor Switch Test Secondary Interlock Relay RY2Procedure Hood Thermal CUT-OUT TestHood FAN Motor Test Before testing KEY Unit Test Relay TestFoil Pattern on the Printed Wiring Board Test Defrost Center Test1ST Stage 2ND Stage Level TimeOccurrence Cause or Correction RemovalSteps Occurrence Cause or Correction Procedure Component Test Letter Noise Filter Test Measuring Point Indication of OHM-METERTouch Control Panel Assembly Description of LSILSI Signal to sound buzzer 2.0 kHz OUT Oven lamp, fan motor and turntable motor driving signalSignal coming from touch key Signal similar to P46Key strobe signal Hood lamp driving signalHood motor driving signal Segment data signalOther Precautions ServicingShapes of Electronic Components Servicing of Touch Control PanelComponent Replacement and Adjustment Procedure Hood Exhaust Louver RemovalPower Transformer Removal Re-installPictorial Diagram Hood FAN Motor RemovalMagnetron Removal High Voltage Rectifier and High Voltage Capacitor RemovalHood FAN Thermal CUT-OUT Removal Thermal CUT-OUT Cavity RemovalInstallation Cooling FAN Motor RemovalSide View Positive Lock Connector NO-CASE Type Removal Control Panel ASSEMBLY, Control Unit and KEY Unit RemovalPositive lock connector Turntable MotorKey unit location Control Unit and KEY Unit RemovalDoor Replacementdoor Assembly Removal Door Assembly RE-INSTALLDoor Disassembly Door Frame AssemblyChoke Cover Latch SPRING, Latch Head and Door PanelDiagram PictorialFigure S-2. Power Unit Circuit LSI Unit Circuit Figure S-4. Printed Wiring Board Parts List Electric PartsCabinet Parts Control Panel PartsDoor Parts MiscellaneousSCREWS,NUTS, Washers and Other Oven and Cabinet Parts Control Panel Parts Door Parts Miscellaneous Packing and Accessories Non-replaceable itemsFMV156DBE FMV156DSE FMV156DQE FMV156DCF FMV156DBE FMV156DSE FMV156DQE FMV156DCF FMV156DBE FMV156DSE FMV156DQE FMV156DCF
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