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MIDEA SERVICE MANUAL
MICROWAVE OVEN
MODEL: Convection
W-Convection
Semi-Convection
November, 2017
This document is published to be used for after sales service only. The content are subject
to change without prior notice.
In interest of user safety the appliance should be restored to its original condition and only
parts identical to those should be applied.
Midea Kitchen Appliance
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Related Manuals for Midea ML2EC10SABS
Summary of Contents for Midea ML2EC10SABS
- Page 1 MIDEA SERVICE MANUAL MICROWAVE OVEN MODEL: Convection W-Convection Semi-Convection November, 2017 This document is published to be used for after sales service only. The content are subject to change without prior notice. In interest of user safety the appliance should be restored to its original condition and only parts identical to those should be applied.
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Page 2: Table Of Contents
CONTENTS CAUTIONS INSTALLATIONS SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS MICROWAVE LEAKAGE TEST MEASUREMENT OF MICROWAVE POWER OUTPUT DISASSEMBLY AND ADJUSTMENT 1. Outer Case Removal . Power Supply Cord Removal 3. Control Panel Assembly Removal 4. Door Assembly Removal 5. High Voltage Transformer Removal 6. -
Page 3: Cautions
CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connection. -
Page 4: Installations
INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. INSTALLING EARTHING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with This microwave oven is designed to be used in a fully a soft, damp cloth. Check for damage such as earthed condition. -
Page 5: Service Information
SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS NECESSARY MEASURING INSTRUMENTS Tools normally used for TV servicing are sufficient. • TESTER(VOLTS-DC, AC., Ohmmeter) Standard tools are listed below. • Microwave survey meter • Diagonal pliers - Holaday HI-1500 • Long nose pliers HI-1501 •... - Page 6 MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED Do not exceed meter full scale deflection. The test probe must be removed no faster than When you replace the magnetron, measure for 1 inch/sec (2.5 cm/sec) along the shaded area, microwave energy leakage before the outer case is otherwise a false reading may result.
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Page 7: Measurement Of Microwave Power Output
MEASUREMENT OF MICROWAVE POWER OUTPUT • Microwave power output measurement is made with is measured while the microwave generator is the microwave oven supplied at its rated voltage and operating at full power. Magnetron filament heat-up operated at its maximum microwave power setting with time is not included. -
Page 8: Door Assembly Removal
4. DOOR ASSEMBLY REMOVAL 5. HIGH VOLTAGE TRANSFORMER REMOVAL 1) Open the door. 2) Remove two screws holding the Hinge 1) Discharge the high voltage capacitor. to the Cavity Ass'y. 2) Disconnect the leadwire from magnetron, high voltage CAUTION : Be careful not to damage Door C transformer, and capacitor. -
Page 9: Air Guide Assembly Removal
8 . AIR GUIDE ASSEMBLY REMOVAL 1 . TURNTABLE MOTOR REMOVAL 1) Disconnect the leadwire from lamp, A.C Relay and 1) Remove the glass tray. monitor resistor and magnetron. 2) Remove the pulley shaft VERYCAREFULLY 3) Lay the unit down on its back. 2) Remove the screw to the cavity. -
Page 10: Pcb Assembly Removal
11 PCB ASSEMBLY REMOVAL 12 INTERLOCK SYSTEM 1) Remove the control panel assembly from the 1) INTERLOCK MECHANISM cavity. The door lock mechanism is a device which has been specially designed to eliminate completely 2) Remove screws which hold the PCB to microwave activity when the door is opened during control panel. -
Page 11: Interlock Continuity Test
INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. TYPE NO. KW3A FOR SWITCHS 2 . SECONDARY INTERLOCK SWITCH TEST 1 . PRIMARY INTERLOCK SWITCH TEST Disconnect the wire lead from the secondary When the door release button is depressed slowly switch. -
Page 12: Component Test Procedure
COMPONENT TEST PROCEDURE CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. - Page 13 COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis Filament NOTE: When testing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition. HIGH VOLTAGE Measure the resistance. Normal: Momentarily indicates CAPACITOR (Ohm-meter scale: Rx1000) several ohms, and then...
- Page 14 COMPONENTS TEST PROCEDURE RESULTS FUSE Check for continuity of the fuse with an Normal Abnormal multi-meter. NOTE: If the fuse is blown, check the primary, the secondary, and the monitor switches, H.V.D. and H.V.C. before replacing the fuse. If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time.
- Page 15 COMPONENTS TEST PROCEDURE RESULTS Check for P.C.B. connector. L.V.Transformer of P.C.B Normal Abnormal Disconnect the 3 pin (Refer to schemetic diagram) connector from P.C.B. 1 3 5 Cooking Start RELAY 2, RELAY 3 Relay 3 OF P.C.B. (Wire leads removed.) Relay 4 Note: Relay Relay 1: Lamp...
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Page 16: Trouble Shooting
TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1. Check grounding before checking for trouble. 2. - Page 17 (TROUBLE 1) The following visual conditions indicate a probable defective control circuit. 1. Incomplete segments. • Segment missing. • Partial segment missing. • Digit flickering (NOTE: Slight flickering is normal.) 2. Colon does not turn on or blink. 3. A distinct change in the brightness of one or more numbers in display. 4.
- Page 18 (TROUBLE 2) Oven does not operate at all ; Display window does not display any figures and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of the Replace primary Check continuity 1. Fuse blows. Continuity. monitor switch. and monitor of monitor switches.
- Page 19 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Replace Defective Check continuity 1.Setting time does No continuity. secondary switch. secondary switch.
- Page 20 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY No microwave Disconnect the Defective P.C.B Replace P.C.B No continuity. oscillation. wire leads from assembly assembly relay 5 and check continuity Continuity.
- Page 21 (TROUBLE 6) Oven does not cook properly when programmed for the set power level (Operates properly on HIGH) CONDITION CHECK RESULT CAUSE REMEDY Defective P.C.B. Replace P.C.B. Output is full when Disconnect the Abnormal. assembly. assembly. you set lower wire leads from power level.
- Page 22 (TROUBLE 8) Convection REMEDY CONDITION CHECK RESULT CAUSE Convection Heater Malfunction the Heater. Abnormal. Replace. operating. heater. is not Normal. Thermostat and Malfunction the Abnormal. Replace. relay3.(Convection) thermostat. Normal. Replace or Wire connection. No continuity. Open or loosen. connect tightly. Lower tempera- Malfunction the Heater.
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Page 23: Attached Files List
ATTACHED FILES LIST 1. Exploded View 2. Spare Parts List 3. Wiring Diagram * Note: The manual may update without prior notice. Please download the latest version on website: https://tsp.midea.com.