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SOI 12.06 FV

599 37 42-75

SERVICE MANUAL

MICROWAVE OVENS

ELECTROLUX HOME PRODUCTS

Corso Lino Zanussi,30

Publication No.

I - 33080 PORCIA /PN (ITALY)

599 37 42-75

Tel +39 0434 394850
Fax +39 0434 394096

SOI

Edition: 12.2006

EN/SERVICE/FV

Microwave Oven

GRILL AND CONVECTION

MICROWAVE OVEN

(Micromat Combi)

MCC4060E

MO940CXE

EMC4090X

ZM40STX

ZM40STN

Содержание EMC4090X

Страница 1: ... HOME PRODUCTS Corso Lino Zanussi 30 Publication No I 33080 PORCIA PN ITALY 599 37 42 75 Tel 39 0434 394850 Fax 39 0434 394096 SOI Edition 12 2006 EN SERVICE FV Microwave Oven GRILL AND CONVECTION MICROWAVE OVEN Micromat Combi MCC4060E MO940CXE EMC4090X ZM40STX ZM40STN ...

Страница 2: ...SOI 12 06 FV 2 43 599 37 42 75 ...

Страница 3: ...CATIONS 6 APPEARANCE VIEW 7 CONTROL PANEL 4 OPERATION SEQUENCE 10 FUNCTION OF IMPORTANT COMPONENTS 12 TROUBLESHOOTING GUIDE 13 TEST PROCEDURES 14 JOG CONTROL PANEL ASSEMBLY 22 SERVICING 23 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE 24 MICROWAVE MEASUREMENT 30 TEST DATA A GLANCE 31 SCHEMATIC DIAGRAMS 32 PICTORIAL DIAGRAM 33 ...

Страница 4: ... The parts marked are used at voltage more than 250V Schematic Diagrams WARNING Never operate the oven until the following points are ensured A The door is tightly closed B The door and oven hinges are not defective C The door packing is not damaged D The door is not deformed or warped E There is not any other visible damage with the oven Servicing and repair work must be carried out only by train...

Страница 5: ... the primary of the power transformer REMEMBER TO CHECK 4R 1 Reconnect all leads removed from components during testing 2 Replace the outer case cabinet 3 Reconnect the supply 4 Run the oven Check all functions Microwave ovens should not be run empty To test for the presence of microwave energy within a cavity place a cup of cold water on the oven turntable close the door and set the power to HIGH...

Страница 6: ...icrowave Power for Variable Cooking Repetition Rate 100 HIGH Full power throughout the cooking time 70 MEDIUM HIGH approx 70 of FULL Power 50 MEDIUM approx 50 of FULL Power 30 MEDIUM LOW approx 30 of FULL Power 10 LOW approx 10 of FULL Power Convection temperature control range 250 C 230 C 220 C 190 C 180 C 160 130 C 100 C and 40 C Control Complement 1 COOKING indicator 2 START indicator 3 GRILL i...

Страница 7: ... Control panel 6 Shelf runners 7 Waveguide cover 8 Oven cavity 9 Coupling 10 Door seals and sealing surfaces 11 Door opening handle 12 Air vent intake opening 13 Outer cover 14 Power cord 15 Power supply cord support clip U K BACK VIEW EUROPEAN BACK VIEW 16 Turntable 17 Turntable support 18 High Rack 19 Low Rack 20 Square shelf 21 Square tray ...

Страница 8: ...GUAGE button 9 COOKING MODE knob for microwave cooking for microwave cooking with GRILL for microwave cooking with CONVECTION for GRILL for CONVECTION 10 TIME WEIGHT knob rotate the knob to enter either the cooking defrosting time or weight of food 11 AUTO COOK button 12 COOK FROM FROZEN button 13 AUTO DEFROST button 14 MICROWAVE POWER LEVEL button 15 START QUICK button 16 STOP button 17 CONVECTIO...

Страница 9: ...LANGUAGE button 9 COOKING MODE knob for microwave cooking for microwave cooking with GRILL for microwave cooking with CONVECTION for GRILL for CONVECTION 10 TIME WEIGHT knob rotate the knob to enter either the cooking defrosting time or weight of food 11 AUTO COOK button 12 COOK FROM FROZEN button 13 AUTO DEFROST button 14 MICROWAVE POWER LEVEL button 15 START button 16 STOP button 17 CONVECTION b...

Страница 10: ...ATION button 8 LANGUAGE button 9 COOKING MODE knob for microwave cooking for microwave cooking with GRILL for microwave cooking with CONVECTION for GRILL for CONVECTION 10 TIME WEIGHT knob rotate the knob to enter either the cooking defrosting time or weight of food 11 AUTO COOK button 12 COOK FROM FROZEN button 13 AUTO DEFROST button 14 MICROWAVE POWER LEVEL button 15 START button 16 STOP button ...

Страница 11: ...NG CONDITION HIGH COOKING Enter a desired cooking time by touching the TIME keys and start the oven by touching START key Function sequence Figure O 2 CONNECTED COMPONENTS RELAY Oven lamp Turntable motor RY1 Power transformer RY3 Fan motor RY6 1 The line voltage is supplied to the primary winding of the high voltage transformer The voltage is converted to about 3 3 volts A C output on the filament...

Страница 12: ... a 32 second time base through the relay contact which is coupled with the current limiting relay RY2 The following levels of microwave power are given 32 sec ON 100 HIGH 100 24 sec ON 70 MEDIUM HIGH Approx 70 18 sec ON 50 MEDIUM Approx 50 12 sec ON 30 MEDIUM LOW Approx 30 6 sec ON 10 LOW Approx 10 NOTE The ON OFF time ratio does not exactly correspond to the percentage of microwave power because ...

Страница 13: ...button When the START button is pressed the following operations occur 1 The relays RY1 RY6 and RY7 are energized the oven lamp turntable motor fan motor and convection motor are turned on 2 The relay RY4 is energized and the main supply voltage is applied to the convection heating element 3 The oven will continue to turn the convection heating element on and off to maintain the temperature for th...

Страница 14: ...ro 50 48 Micro 100 Grill 15 Grill 50 48 40 Micro 50 48 D U A L Micro 70 Conv No reduction NOTE 1 If the multiple sequence cooking is carried out in same mode the basis cooking time is calculated from the first 2 Even if the cooking is stopped by the STOP button or opening the door the basis cooking time is calculated from the first 3 If the same cooking mode is repeated within 1 and 15 seconds the...

Страница 15: ...iately after closing of the monitor switch SW3 COM NC contacts CAUTION BEFORE REPLACING A BLOWN FUSE SWITCH SW3 FOR PROPER OPERATION REFER TO CHAPTER TEST PROCEDURE FUSE F1 20A 250V If the wire harness or electrical components are shortcircuited this fuse F1 20A blows to prevent an electric shock of fire hazard FUSE F2 F8A 250V 1 If the wire harness or electrical components are shortcircuited this...

Страница 16: ...ool air This cool air is directed through the air vanes surrounding the magnetron and cools the magnetron This air is channelled through the oven cavity to remove steam and vapours given off from heating food It is then exhausted through the exhausting air vents of the oven cavity CONVECTION MOTOR CM The convection motor drives the convection fan and provide the heated air GRILL HEATING ELEMENT GH...

Страница 17: ...n because a portion of cooling air is channelled through the cavity to remove steam and vapours given off from the heating foods It is then exhausted at the top of the oven cavity into a condensation compartment Convection Cooking Damper is in the closed position so that no hot air will be allowed to leak out the oven cavity Damper Operation 1 When power supply cord is plugged in or when the contr...

Страница 18: ... Open Fire sensing condition Closed TROBLESHOOTING GUIDE When troubleshooting the microwave oven it is helpful to follow the Sequence of Operation in performing the checks Many of the possible causes of trouble will require that a specific test be performed These tests are given a procedure letter which will be found in the Test Procedure section IMPORTANT If the oven becomes inoperative Because o...

Страница 19: ... not operate Oven lamp lights Convection fan motor does not operate Fan motor operates Turntable motor does not operate Oven lamp lights Oven or any electrical parts except fan motor does not stop when cooking time is 0 or STOP button is pressed Oven stops afther 4 minutes and 15 seconds since START button is pressed Except Microwave mode and Dual cook mode Display operate properly but all electri...

Страница 20: ...n the other hand if the temperature of the water with V ml rises ΔT C during this microwave heating period the calorie of the water is V x ΔT The formula is as follows P x t 4 187 V x Δ T 0 55 x mc T2 T0 Our condition for water load is as follows Room temperature around 20 C Water load 1000 g Heating time 47 sec T2 Final Temperature P W 4 187 x V x ΔT t Power supply Voltage Rated voltage Initial t...

Страница 21: ...power should be at least 15 of the rated output power CAUTION 1 C CORRESPONDS TO 90 WATTS REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT B HIGH VOLTAGE TRANSFORMER TEST WARNING High voltages and large currents are present at the secondary winding and filament winding of the high voltage transformer It is very dangerous to work near this part when the oven is on NEVER make any voltage measurements...

Страница 22: ...with high voltage asymmetric rectifier When the asymmetric rectifier is defective check whether magnetron high voltage rectifier high voltage wire or filament winding of the high voltage transformer is shorted CARRY OUT 4R CHECKS NOTE FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER THE BATTERIES OF THE MEASURING INSTRUMENT MUST HAVE A VOLTAGE OF AT LEAST 6 VOLTS BECAUSE OTHERWISE AN INFINITE RE...

Страница 23: ...3D CHECKS Disconnect the leads from the terminals of the thermal cut out Then using an ohmmeter make a continuity test across the two terminals as described in the below Table Thermal Cut out Test Denominazione parte Temperatura in condizione ON circuito chiuso C Temperatura in condizione OFF circuito aperto C Indication of ohmmeter When room temperature is approx 20 C Interr termico TC01 145 C Th...

Страница 24: ...n the terminals as described in the following table MEASURING POINTS INDICATION OF OHMMETER Between N and L Approx 680 kΩ Between terminal N and WHITE Short circuit Between terminal L and RED Short circuit If incorrect readings are obtained replace the noise filter unit CARRY OUT 4R CHECKS J BLOWN FUSE F1 20A CARRY OUT 3D CHECKS If the fuse F1 20A is blown there is a short or a ground in electrica...

Страница 25: ... wire leads to the heating element to be tested check the insulation resistance between the element terminal and cavity using 500V 100MΩ insulation tester The insulation resistance should be more than 10 MΩ in the cold start If the results of above test 1 and or 2 are out of above specifications the heating element is probably faulty and should be replaced CARRY OUT 4R CHECKS M CONTROL PANEL ASSEM...

Страница 26: ...that is the contacts are closed when the door is closed and open when the door is open If the door sensing switch stop switch is good disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the door sensing switch is closed either close the door or short the door sensing switch connecter Use the Key unit matrix indicated on the control panel schematic and plac...

Страница 27: ... the input circuit on the PWB this foil pattern acts as a fuse If the foil pattern is open follow the troubleshooting guide given below for repair Problem POWER ON indicator does not light up CARRY OUT 3D CHECKS STEPS OCCURRENCE CAUSE OR CORRECTION 1 The rated AC voltage is not present between Pin No 1 3 of the 4 pin connector E Check supply voltage and oven power cord 2 The rated AC voltage is no...

Страница 28: ...gnal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit It accompanies a very small error because it works on commercial frequency 4 ACL A circuit to generate a signal which resets the LSI to the initial state when power is supplied 5 Buzzer Circuit The buzzer is responsive to signals from the LSI to emit audible sounds key tou...

Страница 29: ...n repetition according to the power level 10 6 sec 26 sec 10 8 sec 40 sec Grill TOP heating element driving signal Power output On time OFF time 100 48 sec 0 sec 90 44 sec 4 sec 80 40 sec 8 sec 70 36 sec 12 sec 60 32 sec 16 sec 50 26 sec 22 sec 40 22 sec 26 sec 30 16 sec 32 sec 20 12 sec 36 sec To turn on and off the grill heating element relay RY3 L level during grill cooking convection cooking o...

Страница 30: ...nd check all functions A On some models the power supply cord between the touch control panel and the oven itself is so short that the two can t be separated For those models check and repair all the controls sensor related ones included of the touch control panel while keeping it connected to the oven B On some models the power supply cord between the touch control panel and the oven is long enou...

Страница 31: ...ic shock take the following these procedures 1 Before wiring 1 Disconnect the power supply 2 Open the door and wedge the door open 3 Discharge the high voltage capacitor and wait for 60 seconds 2 Don t let the wire leads touch to the following parts 1 High voltage parts Magnetron High voltage transformer High Voltage capacitor and High voltage rectifier assembly 2 Hot parts Grill heating element C...

Страница 32: ...tor 4 Remove one 1 screw holding earth side terminal of the high voltage rectifier assembly to the base plate through the capacitor holder 5 Release the capacitor holder from the base plate 6 Remove the high voltage capacitor from the capacitor holder CAUTION WHEN REPLACING HIGH VOLTAGE RECTIFIER ASSEMBLY ENSURE THAT THE CATHODE EARTH CONNECTION IS SECURELY FIXED TO THE CAPACITOR HOLDER AND BASEPL...

Страница 33: ... using the pliers 2 Remove the fan blade assembly from the shaft of the fan motor by pulling and rotating the fan blade with your hand 3 Now the fan blade is free CAUTION Do not re use the removed fan blade as the fixing hole may be oversize 11 Remove the two 2 screws holding the fan motor to the fan duct 12 Now the fan motor is free INSTALLATION 1 Install the the fan motor to the fan duct with th...

Страница 34: ...oved 2 Remove the one 1 screw holding the earth wire of the power supply cord to the back plate 3 Release the power supply cord from the back plate 4 Remove the two 2 screws holding the rear barrier to the base plate 5 Release the three 3 tabs of rear barrier from the base plate And remove the rear barrier 6 Remove the one 1 screw holding the back plate to the base plate 7 Remove the one 1 screw h...

Страница 35: ...the wire leads as Positive lock connector removal above 3 Lift up the oven lamp from its retaining clips by pushing the tab of the air intake duct 4 Now the oven lamp is free Figure C 3 Oven lamp POWER SUPPLY CORD REPLACEMENT REMOVAL 1 CARRY OUT 3D CHECKS 2 Remove the one 1 screw holding the green yellow wire to the back plate 3 Disconnect the leads of the power supply cord from the noise filter r...

Страница 36: ... the latch hook by moving it back and forward or up and down In and out play of the door allowed by the latch hook should be less than 0 5 mm The horizontal position of the latch hook should be placed where the monitor switch has activated with the door closed The vertical position of the latch hook should be placed where the monitored latch switch and stop switch have activated with the door clos...

Страница 37: ...r frame with eight 8 screws 5 Re install choke cover to door panel by clipping into position 6 Locate door panel hinge pins into cavity hinge location holes 7 Re install the door stopper to the chock cover Note After any service to the door A Make sure that the monitor switch monitored latch switch and stop switch are operating properly Refer to chapter Test Procedures B An approved microwave surv...

Страница 38: ...orm of 600 ml beaker with inside diameter of approx 8 5cm and made of an electrically non conductive material such as glass or plastic The placing of this standard load in the oven is important not only to protect the oven but also to insure that any leakage is measured accurately 4 Close the door and turn the oven ON with the timer set for several minutes If the water begins to boil before the su...

Страница 39: ...ERMISTOR SW4 DAMPER SWITCH SW2 STOP SWITCH CONTROL UNIT T C TRANSFORMER NOISE FILTER F2 FUSE F8A TC3 CONV THERMO CUT OUT LIVE NEUTRAL DAMPER MOTOR CONVECTION MOTOR FAN MOTOR TURNTABLE MOTOR CH CONVECTION HEATING ELEMENT GH GRILL HEATING ELEMENTS C CAPACITOR H V RECTIFIER OVEN LAMP SW3 MONITOR SWITCH ASYMMETRIC RECTIFIER T HIGH VOLTAGE TRANSFORMER F1 FUSE 20A TC2 GRILL THERMAL CUT OFF SW1 MONITORED...

Страница 40: ...WITCH SW2 STOP SWITCH CONTROL UNIT T C TRANSFORMER NOISE FILTER F2 FUSE F8A TC3 CONV THERMO CUT OUT LIVE NEUTRAL DAMPER MOTOR CONVECTION MOTOR FAN MOTOR TURNTABLE MOTOR CH CONVECTION HEATING ELEMENT GH GRILL HEATING ELEMENTS C CAPACITOR H V RECTIFIER OVEN LAMP SW3 MONITOR SWITCH ASYMMETRIC RECTIFIER T HIGH VOLTAGE TRANSFORMER F1 FUSE 20A TC2 GRILL THERMAL CUT OFF SW1 MONITORED LATCH SWITCH TC1 MAG...

Страница 41: ...MER NOISE FILTER F2 FUSE F8A TC3 CONV THERMO CUT OUT LIVE NEUTRAL DAMPER MOTOR CONVECTION MOTOR FAN MOTOR TURNTABLE MOTOR CH CONVECTION HEATING ELEMENT GH GRILL HEATING ELEMENTS C CAPACITOR H V RECTIFIER OVEN LAMP SW3 MONITOR SWITCH ASYMMETRIC RECTIFIER T HIGH VOLTAGE TRANSFORMER F1 FUSE 20A TC2 GRILL THERMAL CUT OFF SW1 MONITORED LATC H SWITCH TC1 MAG THERMAL CUT OFF NOISE SUPRESSION COIL EARTH T...

Страница 42: ...R NOISE FILTER F2 FUSE F8A TC3 CONV THERMO CUT OUT LIVE NEUTRAL DAMPER MOTOR CONVECTION MOTOR FAN MOTOR TURNTABLE MOTOR CH CONVECTION HEATING ELEMENT GH GRILL HEATING ELEMENTS C CAPACITOR H V RECTIFIER OVEN LAMP SW3 MONITOR SWITCH ASYMMETRIC RECTIFIER T HIGH VOLTAGE TRANSFORMER F1 FUSE 20A TC2 GRILL THERMAL CUT OFF SW1 MONITORED LATC H SWITCH TC1 MAG THERMAL CUT OFF NOISE SUPRESSION COIL EARTH THE...

Страница 43: ...ITOR SWITCH OL OVEN LAMP NEUTRAL LIVE EARTH GH GRILL HEATING ELEMENT NOISE FILTER CM CONVECTION MOTOR TC3 THERMAL CUT OUT CONV SW1 MONITORED H V RECTIFIER Black Tube Red wire Long Black Tube SW4 DAMPER SWITCH DM DAMPER MOTOR CH CONVECTION HEATING ELEMENT FM FAN MOTOR TC1 THERMAL CUT OUT MAG TURNTABLE MOTOR LATCH SWITCH SW2 STOP SWITCH THERMISTOR CONTROL PANEL TC1 TRANSFORMER ...

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