Electrolux MCC4060E Service Manual
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Electrolux MCC4060E Service Manual

Electrolux MCC4060E Service Manual

Grill and convection microwave oven (micromat combi)
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© ELECTROLUX HOME PRODUCTS
Corso Lino Zanussi,30
I - 33080 PORCIA /PN (ITALY)
Tel +39 0434 394850
Fax +39 0434 394096
SOI
Edition: 12.2006
SOI 12.06 FV
Publication No.
599 37 42-75
EN/SERVICE/FV
SERVICE MANUAL
MICROWAVE OVENS
Microwave Oven
GRILL AND CONVECTION
MICROWAVE OVEN
(Micromat Combi)
MCC4060E
MO940CXE
EMC4090X
ZM40STX
ZM40STN
599 37 42-75

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  • Page 1 SERVICE MANUAL MICROWAVE OVENS Microwave Oven GRILL AND CONVECTION © ELECTROLUX HOME PRODUCTS Publication No. MICROWAVE OVEN Corso Lino Zanussi,30 (Micromat Combi) I - 33080 PORCIA /PN (ITALY) 599 37 42-75 Tel +39 0434 394850 MCC4060E Fax +39 0434 394096...
  • Page 2 SOI 12.06 FV 2/43 599 37 42-75...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS CAUTION, MICROWAVE RADIATION....................4 SERVICING / GENERAL INFORMATION ....................5 PRODUCT SPECIFICATIONS ........................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...

  • Page 4: Caution, Microwave Radiation

    CAUTION CAUTION MICROWAVE RADIATION DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR OR OTHER PARTS THAT CONDUCT MICROWAVE ENERGY. GENERAL IMPORTANT INFORMATIONS This Manual has been prepared to provide Service Engineers with Operation and Service Information. It is recommended that service engineers carefully study the entire text of this manual, so they will be qualified to render satisfactory customer service.

  • Page 5: Servicing / General Information

    SERVICING WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with the following parts will result in electrocution High voltage capacitor, High Voltage transformer, Magnetron, High voltage rectifier assembly, High voltage wires. REMEMBER TO CHECK 3D REMEMBER TO CHECK 4R 1) Disconnect the supply.

  • Page 6: Product Specifications

    PRODUCT SPECIFICATIONS SPECIFICATION ITEM DESCRIPTION Power Requirements 230 Volts / 50 Hertz / Single phase, 3 wire earthed Power Consumption Microwave cooking 1.5kW Approx. 6.7A Convection cooking 2.7kW Approx.12A Grill cooking 2.7kW Approx.12A Micro and Grill ....2.8 kW Approx. 12.7 A Dual cooking Micro and Convection ..

  • Page 7: Appearance View

    APPEARANCE VIEW OVEN 1. Fixing points (4 points) 2. Grill heating element 3. Convection heating element 4. Oven lamp 5. Control panel 6. Shelf runners 7. Waveguide cover 8. Oven cavity 9. Coupling 10. Door seals and sealing surfaces. 11. Door opening handle 12.

  • Page 8: Control Panel

    CONTROL PANEL MCC4090E Digital display and indicators: 1. COOKING indicator 2. START indicator 3. GRILL indicator 4. CONVECTION indicator 5. MICROWAVE indicator 6. INFORMATION indicator Operating keys: 7. INFORMATION button 8. LANGUAGE button 9. COOKING MODE knob for microwave cooking for microwave cooking with GRILL for microwave cooking with CONVECTION for GRILL...
  • Page 9 CONTROL PANEL EMC4090X Digital display and indicators: 1. COOKING indicator 2. START indicator 3. GRILL indicator 4. CONVECTION indicator 5. MICROWAVE indicator 6. INFORMATION indicator Operating keys: 7. INFORMATION button 8. LANGUAGE button 9. COOKING MODE knob for microwave cooking for microwave cooking with GRILL for microwave cooking with CONVECTION for GRILL...
  • Page 10 CONTROL PANEL MO040CXE ZM4060STX ZM4090X ZM4090STN Digital display and indicators: 1. COOKING indicator 2. START indicator 3. GRILL indicator 4. CONVECTION indicator 5. MICROWAVE indicator 6. INFORMATION indicator Operating keys: 7. INFORMATION button 8. LANGUAGE button 9. COOKING MODE knob for microwave cooking for microwave cooking with GRILL for microwave cooking with CONVECTION...

  • Page 11: Operation Sequence

    OPERATION SEQUENCE OFF CONDITION Closing the door activates the monitored latch switch and the stop switch. IMPORTANT When the oven door is closed, the contacts COM - NC of the monitored switch must be open. When the microwave oven is plugged in a wall outlet (230V / 50Hz), the line voltage is supplied to the noise filter.
  • Page 12 OPERATION SEQUENCE The circuit to the turntable motor is cut off when the contacts (COM-NO) of the monitored latch switch SW1 are made open. The oven lamp remains on even if the oven door is opened after the cooking cycle has been interrupted, because the relay RY1 stays closed.
  • Page 13 OPERATION SEQUENCE PRE-HEATING (by 160°C - 250°C) Turn select knob to CONVECTION Programme the desired convection temperature of 160°C - 250°C by pressing the CONVECTION 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.
  • Page 14 OPERATION SEQUENCE ON/OFF TIME RATIO NOTE: 1. If the multiple sequence cooking is carried out in In dual cooking, the magnetron operate within a 48 same mode, the basis cooking time is calculated second time base. The following table is the ON / OFF from the first.

  • Page 15: Function Of Important Components

    FUNCTION OF IMPORTANT COMPONENTS 3. If the door is opened and the monitored latch DOOR OPEN MECHANISM switch SW1 contacts (COM-NO) fail to open, the fuse F2 F8A blows immediately after The door can be opened by pulling the door handle. closing of the monitor switch SW3 (COM-NC) contacts.
  • Page 16 FUNCTION OF IMPORTANT COMPONENTS THERMAL CUT-OUT TC3 170°C (CONV.) FAN MOTOR FM This thermal cut-out protects the convection motor The fan motor drives a blade which draws external cool against overheating. If the temperature of the thermal air. This cool air is directed through the air vanes cut-out TC3 rises above 170°C because the convection surrounding the magnetron and cools the magnetron.
  • Page 17 FUNCTION OF IMPORTANT COMPONENTS DAMPER OPEN-CLOSE MECHANISM Grill Heating Convection Door Oven Cavity Elements Passage Damper position is set automatically by damper motor DM, damper switch and motor cam. Convection These components are operated by a signal that Heating Element judges if microwave cooking or convection cooking Cooling operation is selected by the CPU unit.
  • Page 18 FUNCTION OF IMPORTANT COMPONENTS 4. Operation of damper is shown below. Cooking Mode Operation of Damper Microwave cooking Open Convection cooking Closed Grill; during backed up with Closed Convection heating element Grill; afther convection heting Open element backed up has stopped Dual (Microwave and Convection) Closed Dual (Microwave and Grill)
  • Page 19 TROBLESHOOTING GUIDE BLOCKED COOLING FAN ● ● ● ● BLOCKED CONVECTION FAN ● ● ● ● NO POWER AT WALL OUTLET ● HOME FUSE OR BREAKER ● ● MIS-ADJUSTMENT OF SWITCHES ● ● ● ● ● ● ● ● ● BLOCKED VENTILATION OPENINGS ●...

  • Page 20: Test Procedures

    TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECK Isolate the magnetron from high voltage circuit by removing all leads connected to the filament terminal.
  • Page 21 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Measuring method: 1. Measure the initial temperature of the water before the water is added to the vessel. (Example: The initial temperature T1 = 11°C) 2. Add the 1 litre water to the vessel. 3.
  • Page 22 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST HIGH VOLTAGE RECTIFIER TEST CARRY OUT 3D CHECKS. Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested using an ohmmeter set to its highest range. Connect the ohmmeter across the terminal B+C of the high voltage rectifier and note the reading obtained.
  • Page 23 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST SWITCH TEST CARRY OUT 3D CHECKS. Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table. Table: Terminal Connection of Switch Plunger Operation COM to NO COM to NC COM;...
  • Page 24 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST MOTOR WINDING TEST CARRY OUT 3D CHECKS. Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the two terminals as described in the table below. Table: Resistance of Motor Motors Resistance Ω...
  • Page 25 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 3. If the fuse F2 F8A is blown, there could be shorts in the asymmetric rectifier or there is a ground in wire harness. A short in the asymmetric rectifier may be occurred due to short or ground in H.V. rectifier, magnetron, high voltage transformer or H.V.
  • Page 26 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 2. Control Panel The following symptoms indicate a defective control unit. Before replace the control unit, perform the Jog and Switch unit test (Procedure N) to determine if control unit is faulty. 2-1.In connection with buttons. a) When touching the buttons, a certain group of buttons do not produce a signal.
  • Page 27 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST DC. voltage indicated ..Defective relay. DC. voltage not indicated ..Check diode which is connected to the relay coil. If diode is good, control unit is defective. RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENT Approx.18.0 V D.C.

  • Page 28: Jog Control Panel Assembly

    JOG CONTROL PANEL ASSEMBLY OUTLINE OF JOG CONTROL PANEL The jog control section consists of the following units: 4) ACL A circuit to generate a signal which resets the LSI to (1) Key Unit the initial state when power is supplied. (2) Control Unit (The Control unit consists of Power unit and CPU unit.) 5) Buzzer Circuit...
  • Page 29 SIGNALS AND TIMES FROM LSI Signal to sound buzzer A: Tact switch touch sound. B: Completion sound. C: When the temperature of the oven cavity reaches the preset temperature in the preheating mode, or when the preheating hold time (30 minutes) is elapsed.

  • Page 30: Servicing

    SERVICING 6) Run the oven and check all functions. 1. Precautions for Handling Electronic A. On some models, the power supply cord Components This unit uses CMOS LSI in the integral part of the between the touch control panel and the oven itself is circuits.

  • Page 31: Component Replacement And Adjustment Procedure

    COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1. Disconnect oven from power supply. 1. Door does not close firmly. 2. Make sure that a definite "click" can be heard 2.
  • Page 32 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE OUTER CASE REMOVAL To remove the outer case, proceed as follows. 7. Lift the entire case from the oven. 1. Disconnect oven from power supply. 8. Discharge the H.V capacitor before carrying any 2. Open door and wedge it open. further work.
  • Page 33 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CONTROL PANEL ASSEMBLY REMOVAL 1. CARRY OUT 3D CHECKS. 4. Lift the control panel assembly and pull it 2. Disconnect the main wire harness from the forward. Now, the control panel assembly is free. control panel. 3.
  • Page 34 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE TURNTABLE MOTOR REPLACEMENT 7. Remove the two (2) screws holding the turntable REMOVAL 1. Disconnect the oven from the power supply. motor to the oven cavity back plate. 2. Remove the turntable and roller stay from the 8.
  • Page 35 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CONVECTION MOTOR REMOVAL 5. Remove the cooling fan from the convection motor 1. Remove the one (1) nut and washer from the shaft. convection motor shaft. 6. Remove the two (2) screws holding the convection 2.
  • Page 36 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE GRILL HEATING ELEMENTS REMOVAL 1. CARRY OUT 3D CHECKS. 7. Remove the one (1) screw holding the grill heater 2. Disconnect wire leads from the thermal cut-out angle to the grill heater reflector. (GRILL). 8. Straighten the two (2) tabs of the grill heater angle 3.

  • Page 37: Test Procedures

    COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE DOOR REPLACEMENT REMOVAL 1. Disconnect the oven from the power supply. 6. Locate door panel hinge pins into cavity hinge 2. Push the door slightly. location holes. 3. Remove the door stopper from the choke cover. 7.

  • Page 38: Microwave Measurement

    MICROWAVE MEASUREMENT After adjustment of door latch switches, monitor Recommended instruments are: switch and door are completed individually or NARDA 8100 collectively, the following leakage test must be NARDA 8200 performed with a survey instrument and it must be HOLADAY HI 1500 confirmed that the result meets the requirements SIMPSON 380M of the performance standard for microwave oven.
  • Page 39 SCHEMATICS SCHEMATIC Note: NOTE:CONDITION OF OVEN AC CORD CONNECTION 1. DOOR CLOSED BRN: BROWN 2. PLUGGED IN OVEN. BLU: BLUE 3. NOTHING APPEARS ON DISPLAY. G-Y: GREEN AND YELLOW STRIPE /15: SECTION AREA OF 1.5mm MIN. “ ” Indicates components with potential above 250V.
  • Page 40 SCHEMATICS SCHEMATIC Note: NOTE:CONDITION OF OVEN AC CORD CONNECTION 1. DOOR CLOSED BRN: BROWN 2. “ . 0” APPEARS ON DISPLAY. BLU: BLUE G-Y: GREEN AND YELLOW STRIPE /15: SECTION AREA OF 1.5mm MIN. “ ” Indicates components with potential above 250V.
  • Page 41 SCHEMATICS SCHEMATIC NOTE:CONDITION OF OVEN NOTE: The convection cooking will be carried out as back up until 1. DOOR CLOSED the oven cavity temperature rises to 220°C. 2. COOKING TIME ENTERED. 3. GRILL MODE SELECTED. 4. START KEY TOUCHED. CONTROL UNIT SW4: SW2:...
  • Page 42 SCHEMATICS SCHEMATIC Note: NOTE:CONDITION OF OVEN AC CORD CONNECTION 1. DOOR CLOSED BRN: BROWN 2. COOKING TIME ENTERED. BLU: BLUE 3. DUAL MODE PAD TOUCHED ONCE. G-Y: GREEN AND YELLOW STRIPE 4. CONVECTION TEMPERATURE SELECTED. /15: SECTION AREA OF 1.5mm MIN.
  • Page 43 PICTORIAL C: H.V. CAPACITOR NEUTRAL H.V. RECTIFIER LIVE EARTH SOI 12.06 FV 43/43 599 37 42-75...

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