AEG MICROMAT 120- Manuals

Page 3 - TABLE OF CONTENTS

SOI 12.06 FV 3/43 599 37 42-75 TABLE OF CONTENTS CAUTION, MICROWAVE RADIATION .................................................................................................... 4 SERVICING / GENERAL INFORMATION ..........................................................................................

Page 5 - SERVICING; WARNING TO SERVICE PERSONNEL; GENERAL INFORMATION; WARNING; IMPORTANT; EARTH

SOI 12.06 FV 5/43 599 37 42-75 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 rectifie...

Page 6 - PRODUCT SPECIFICATIONS; SPECIFICATION; for microwave cooking

SOI 12.06 FV 6/43 599 37 42-75 PRODUCT SPECIFICATIONS SPECIFICATION ITEM DESCRIPTION Power Requirements 230 Volts / 50 Hertz / Single phase, 3 wire earthed Microwave cooking 1.5kW Approx. 6.7A Convection cooking 2.7kW Approx.12A Grill cooking 2.7kW Approx.12A Micro and Grill ................... 2.8 ...

Page 7 - APPEARANCE VIEW; OVEN; EUROPEAN BACK VIEW

SOI 12.06 FV 7/43 599 37 42-75 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. Air-ven...

Page 8 - CONTROL PANEL; button

SOI 12.06 FV 8/43 599 37 42-75 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 m...

Page 11 - OPERATION SEQUENCE; OFF CONDITION; relay; NOTE: Energy save mode; the oven may be set in demo mode.; MICROWAVE COOKING CONDITION; Oven lamp, Turntable motor

SOI 12.06 FV 11/43 599 37 42-75 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 / ...

Page 12 - approx. 3 seconds are needed for heating up the magnetron filament.; GRILL COOKING CONDITION

SOI 12.06 FV 12/43 599 37 42-75 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 st...

Page 13 - DUAL COOKING CONDITION; Programme the desired cooking time by turning the select knob to; MICROWAVE and CONVECTION; the following operations occur:

SOI 12.06 FV 13/43 599 37 42-75 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 a...

Page 14 - AUTOMATIC COOKING; CONVECTION MOTOR OPERATION

SOI 12.06 FV 14/43 599 37 42-75 OPERATION SEQUENCE ON/OFF TIME RATIO In dual cooking, the magnetron operate within a 48 second time base. The following table is the ON / OFF time ratio at each power output of the magnetron. POWER OUTPUT ON TIME OFF TIME 100% 48 sec. 0 sec. 70% 36 sec. 12 sec. 50% 26...

Page 15 - FUNCTION OF IMPORTANT COMPONENTS; DOOR OPEN MECHANISM; Function; TC TRANSFORMER

SOI 12.06 FV 15/43 599 37 42-75 FUNCTION OF IMPORTANT COMPONENTS DOOR OPEN MECHANISM The door can be opened by pulling the door handle. Figure D-1. Door Open Mechanism MONITORED LATCH SWITCH SW1 1. When the oven door is closed, the contacts (COM-NO) of the switch must be closed. And the contacts (CO...

Page 16 - doubler

SOI 12.06 FV 16/43 599 37 42-75 FUNCTION OF IMPORTANT COMPONENTS THERMAL CUT-OUT TC3 170°C (CONV.) This thermal cut-out protects the convection motor against overheating. If the temperature of the thermal cut-out TC3 rises above 170°C because the convection fan is interrupted, the ventilation openin...

Page 17 - FIRE SENSING FEATURE; OPEN JUDGE BY THERMISTOR; DAMPER OPEN-CLOSE MECHANISM; Damper Operation

SOI 12.06 FV 17/43 599 37 42-75 FUNCTION OF IMPORTANT COMPONENTS Figure D-2. Convection Cooking System FIRE SENSING FEATURE The oven will stop its operation when there is a fire in the oven cavity in microwave cooking condition. LSI measures the voltage across the temperature measurement circuit int...

Page 19 - TROBLESHOOTING GUIDE

SOI 12.06 FV 19/43 599 37 42-75 TROBLESHOOTING GUIDE BLOCKED COOLING FAN ● ● ● ● BLOCKED CONVECTION FAN ● ● ● ● NO POWER AT WALL OUTLET ● HOME FUSE OR BREAKER ● ● MIS-ADJUSTMENT OF SWITCHES ● ● ● ● ● ● ● ● ● BLOCKED VENTILATION OPENINGS ● ● ● OPENED WIRE HARNESS ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ●...

Page 20 - TEST PROCEDURES; PROCEDURE; the water is V x

SOI 12.06 FV 20/43 599 37 42-75 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST A 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 ...

Page 21 - value; the rated output power.; MEASUREMENT IF THE POWER IS INSUFFICIENT.; HIGH VOLTAGE TRANSFORMER TEST; secondary winding and filament winding of the high voltage; Secondary

SOI 12.06 FV 21/43 599 37 42-75 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. Place the load on the cen...

Page 23 - CARRY OUT 3D CHECKS.

SOI 12.06 FV 23/43 599 37 42-75 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST E 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 C...

Page 24 - MEASURING POINTS

SOI 12.06 FV 24/43 599 37 42-75 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST H 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 Resistan...

Page 25 - in; CONTROL PANEL ASSEMBLY TEST

SOI 12.06 FV 25/43 599 37 42-75 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, magnet...

Page 26 - At a certain digit, all or some segments do not light up.; CARRY OUT 4R CHECKS

SOI 12.06 FV 26/43 599 37 42-75 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 wit...

Page 27 - diode is good, control unit is defective.; CARRY OUT 3D CHECKS

SOI 12.06 FV 27/43 599 37 42-75 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 C...

Page 28 - JOG CONTROL PANEL ASSEMBLY

SOI 12.06 FV 28/43 599 37 42-75 JOG CONTROL PANEL ASSEMBLY OUTLINE OF JOG CONTROL PANEL The jog control section consists of the following units: (1) Key Unit (2) Control Unit (The Control unit consists of Power unit and CPU unit.) The principal functions of these units and signals communicated among...

Page 29 - SIGNALS AND TIMES FROM LSI; Magnetron high-voltage circuit driving signal.

SOI 12.06 FV 29/43 599 37 42-75 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. Magnetron hig...

Page 30 - Servicing of Touch Control Panel; ) Run the oven and check all functions.

SOI 12.06 FV 30/43 599 37 42-75 SERVICING 1. Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed. CMOS LSI have extremely high impedance at its input and output t...

Page 31 - BUILT IN FRAME ASSEMBLY REMOVAL

SOI 12.06 FV 31/43 599 37 42-75 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. 2. Make sure that a definite "click" can be heard when th...

Page 32 - COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE; OUTER CASE REMOVAL; Remove one (1) screw holding earth side; HIGH VOLTAGE TRANSFORMER REMOVAL

SOI 12.06 FV 32/43 599 37 42-75 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE OUTER CASE REMOVAL 7. Lift the entire case from the oven. 8. Discharge the H.V capacitor before carrying any further work. 9. Do not operate the oven with the outer case removed. N.B. : Step 1, 2 and 8 from the basis of t...

Page 33 - CONTROL PANEL ASSEMBLY REMOVAL; Rear view; Shaft; Side view

SOI 12.06 FV 33/43 599 37 42-75 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CONTROL PANEL ASSEMBLY REMOVAL 1. CARRY OUT 3D CHECKS. 2. Disconnect the main wire harness from the control panel. 3. Remove the one (1) screw holding the control panel to the oven cavity. 4. Lift the control panel assemb...

Page 34 - TURNTABLE MOTOR REPLACEMENT

SOI 12.06 FV 34/43 599 37 42-75 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE TURNTABLE MOTOR REPLACEMENT REMOVAL 1. Disconnect the oven from the power supply. 2. Remove the turntable and roller stay from the oven cavity. 3. Turn the oven over. 4. Cut the three (3) bridges holding the turntable mot...

Page 35 - POSITIVE LOCK; REMOVAL

SOI 12.06 FV 35/43 599 37 42-75 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE CONVECTION MOTOR REMOVAL 1. Remove the one (1) nut and washer from the convection motor shaft. 2. Remove the convection fan from the convection motor shaft. 3. Remove the pipe from the convection motor shaft. 4. Remove th...

Page 36 - GRILL HEATING ELEMENTS REMOVAL; After adjustment, make sure of following:

SOI 12.06 FV 36/43 599 37 42-75 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE GRILL HEATING ELEMENTS REMOVAL 1. CARRY OUT 3D CHECKS. 2. Disconnect wire leads from the thermal cut-out (GRILL). 3. Remove the two (2)screws holding the two (2) terminals of the main wire harness to the two (2) grill hea...

Page 37 - DOOR REPLACEMENT; Choke Cover

SOI 12.06 FV 37/43 599 37 42-75 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE DOOR REPLACEMENT REMOVAL 1. Disconnect the oven from the power supply. 2. Push the door slightly. 3. Remove the door stopper from the choke cover. 4. Lift the door upwards. 5. Now, door assembly is free from oven cavity. ...

Page 38 - MICROWAVE MEASUREMENT; REQUIREMENT; NARDA; TEST DATA AT A GLANCE; GH; WARNING: DISCONNECT THE PLUG WHEN MEASURING RESISTANCE

SOI 12.06 FV 38/43 599 37 42-75 MICROWAVE MEASUREMENT After adjustment of door latch switches, monitor switch and door are completed individually or collectively, the following leakage test must be performed with a survey instrument and it must be confirmed that the result meets the requirements of ...

Page 39 - SCHEMATICS

SOI 12.06 FV 39/43 599 37 42-75 SCHEMATICS Figure O-1(a) Oven Schematic-OFF Condition right after the oven is plugged in. Figure O-1(b) Oven Schematic-OFF Condition when the oven door is opened. SCHEMATIC NOTE:CONDITION OF OVEN 1. DOOR CLOSED 2. PLUGGED IN OVEN. 3. NOTHING APPEARS ON DISPLAY. Note: ...

Page 41 - Figure O-4 Oven Schematic Convection Condition.; the oven cavity temperature rises to 220°C.; the grill heating element will be energized as back up.

SOI 12.06 FV 41/43 599 37 42-75 SCHEMATICS Figure O-3 Oven Schematic-Grill cooking Condition (TOP GRILL mode). Figure O-4 Oven Schematic Convection Condition. SCHEMATIC NOTE:CONDITION OF OVEN 1. DOOR CLOSED 2. COOKING TIME ENTERED. 3. GRILL MODE SELECTED. 4. START KEY TOUCHED. NOTE: The convection c...

Page 43 - PICTORIAL

SOI 12.06 FV 43/43 599 37 42-75 PICTORIAL T: HIGH VOLTAGE TRANS FORME R C: H.V. CAPACITOR H IGH VOLT A G E COMPON EN TS AS Y M ETR IC RE CTIFI E R PO W E R SUP P L Y CORD TC2 : THE R M A L CUT-OUT (GRI L L ) MONITOR SW ITCH OL: O VEN L A MP NEUTRAL LIVE EARTH GH: GRI LL H E ATING EL EM ENT NOISE F I...