Daewoo KOT-123Q0A Service Manual
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Daewoo KOT-123Q0A Service Manual

Daewoo KOT-123Q0A Service Manual

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Service Manual
Microwave Oven
Model : KOT-123Q0A
Caution

: In this Manual, some parts can be changed for improving, their
performance without notice in the parts list. So, if you need the
latest parts information,please refer to PPL(Parts Price List) in
Service Information Center (http://svc.dwe.co.kr).
DAEWOO ELECTRONICS CO., LTD.
S/M No. : T123Q0A001
http : //svc.dwe.co.kr

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Summary of Contents for Daewoo KOT-123Q0A

  • Page 1 S/M No. : T123Q0A001 Service Manual Microwave Oven Model : KOT-123Q0A Caution : In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).

  • Page 2: Table Of Contents

    PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not operate or allow the oven to be operated with the door open. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other micro- wave source and make repairs as necessary : (1) Interlock operation (2) proper door closing (3) seal and sealing surfaces (arcing, wear and other damage) (4) damage to or loosening of hinges and latches (5) evi- dence of dropping or abuse.

  • Page 3: Safety And Precautions

    SAFETY AND PRECAUTIONS CAUTION This Device is to be Serviced Only by Properly Qualified Service Personnel. Consult the Service Manual for Proper Service Procedures to Assure Continued Compliance with Federal Performance Standard for Microwave Ovens and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy. 1.

  • Page 4: Specifications

    SPECIFICATIONS POWER SUPPLY 120V ~ 60 Hz, SINGLE PHASE WITH GROUNDING MICROWAVE 1400W POWER CONSUMPTION GRILL COMBINATION MICROWAVE ENERGY OUTPUT 900W MICROWAVE FREQUENCY 2450MHz HOOD LIGHT 30 W × OUTSIDE DIMENSIONS (W × × × × 423 mm (22.2 × 16.0 ×...

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION (KOT-123Q)

  • Page 6: Feature Diagram

    EXTERNAL VIEW 2. FEATURE DIAGRAM 1. DOOR SCREEN Allows viewing of food. The screen is transparent to light, but prevents microwave escaping. 2. DOOR LATCH When the door is closed it will automatically shut off. If the door is opened while the oven is operating, magnetron will automatically shut off.

  • Page 7: Control Panel

    EXTERNAL VIEW 3. CONTROL PANEL 8. TIME SET PAD Used to set the cooking time and the present time. 9. DISPLAY Cooking time, power level, indicators and present time are displayed. 10. QUICK START Touch to set the desired reheat time by 30 seconds.

  • Page 8: Operations And Functions

    OPERATIONS AND FUNCTIONS 1. Connect the main lead to an electrical outlet. 2. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray must always be in place during cooking. 3.

  • Page 9: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY Cautions to be observed when troubleshooting Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. It is completely safety during normal operation. However, carelessness in servicing the oven can result in an electrical shock or possible danger from a short circuit.
  • Page 10 DISASSEMBLY AND ASSEMBLY 1. TO REMOVE CABINET AND AIR GRILLE 1) Remove the ten screws from the top, side and rear of the cabinet. 2) Push the cabinet backward. 3) Remove two long screws from the front of the microwave oven that secure the air grill to the oven and pull the top of the air grill out so that the tabs are free of their slots and remove it.
  • Page 11  Caution: In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr) DISASSEMBLY AND ASSEMBLY 3.
  • Page 12 DISASSEMBLY AND ASSEMBLY 4. METHOD TO REDUCE THE GAP BETWEEN THE DOOR SEAL AND THE OVEN FRONT SURFACE 1) To reduce gap located on part ‘ A’ . Loosen two screws on stopper hinge top, and then push • the door to contact the door seal to oven front surface. Tighten two screws.
  • Page 13  Caution: In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr) DISASSEMBLY AND ASSEMBLY 5.
  • Page 14 DISASSEMBLY AND ASSEMBLY 1) Remove four screws which secure the control panel, push up snap fits and draw forward the control panel assembly. 2) Disconnect all the lead wires connected to control panel assembly. 3) Remove the door open lever from the control panel. 4) Remove four screws which secure the PCB assembly to control panel.
  • Page 15 DISASSEMBLY AND ASSEMBLY 7. TO REMOVE MAGNETRON 1) Remove a screw which secure the magnetron. 2) Remove the magnetron from the wave guide. 3) Reverse the above steps for reassembly. NOTE Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage.
  • Page 16 DISASSEMBLY AND ASSEMBLY 8. TO REMOVE WIND GUIDE ASSEMBLY 1) Remove a screw which secure the wind guide assembly. 2) Draw forward the wind guide assembly. 3) Pull the fan from the motor shaft. 4) Remove two screws which secure the motor shaded pole. 5) Remove the motor shaded pole.
  • Page 17 DISASSEMBLY AND ASSEMBLY 10. TO REMOVE THE VENTILATION (VENT) MOTOR 1) Remove the cover *B. 2) Remove six screws for the air guide *B. 3) Remove the air guide *B. Ventilation motor 4) Remove two screws for the vent motor and lift the vent motor.
  • Page 18 DISASSEMBLY AND ASSEMBLY 13. TO REMOVE THE CAVITY LAMP 1) Remove the screws for the air grille and remove the air grille. 2) Push the tab on cavity lamp bracket and lift the cavity lamp bracket. 3) Remove the screw from the cavity lamp bracket. 14.
  • Page 19 DISASSEMBLY AND ASSEMBLY 16. TO REMOVE THE LINE FUSE 1) Remove two screws from the air grill and remove the grill. 2) Remove the screw from the top center tab of the control panel. 3) Without touching the metal ends, remove the defective line fuse from its holder.

  • Page 20: Interlock Mechanism And Adjustment

    INTERLOCK MECHANISM AND ADJUSTMENT The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of micro- wave.
  • Page 21 INTERLOCK MECHANISM AND ADJUSTMENT 2. SECONDARY INTERLOCK SWITCH AND INTERLOCK MONITOR SWITCH When the door is closed, the hook pushes the push lever downward. The push lever presses the button of the interlock monitor switch to bring it under “ OFF” condition and presses the button of the secondary interlock switch to bring it under “...
  • Page 22 INTERLOCK MECHANISM AND ADJUSTMENT 4. Interlock switch replacement Whenever safety interlock switches are replaced: 1) Refer to the following diagram. 2) Check the connection of monitor switch after replacement. 3) Perform the electrical continuity check of interlock switches and microwave emission test mentioned in this manual. SYMBOL COLOR BLUE...

  • Page 23: Troubleshooting Guide

    TROUBLESHOOTING GUIDE Follow the procedures below to check if the oven is defective or not 1) Check grounding before checking trouble. 2) Be careful of the high voltage circuit. 3) Discharge the high voltage capacitor. 4) When checking the continuity of the switches, fuse or high voltage transformer, disconnect one lead wire from these parts and then check continuity with the AC plug removed.
  • Page 24 TROUBLESHOOTING GUIDE CONDITION CHECK RESULT CAUSE REMEDY Outlet has Check continuity of Defetive Replace proper voltage open thermostat. Continuity oven thermostat. Fuse does not open. Check continuity of Open power Replace power supply cord. Continuity supply cord. Normal Replace Defetive touch control circuit Malfunction of Replace...
  • Page 25 TROUBLESHOOTING GUIDE (TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY No microwave Check continuity of Continuity oscillation connecting wire of magnetron. Replace Check the isolation Defective No good high voltage of filament winding transformer transformer Good...
  • Page 26 TROUBLESHOOTING GUIDE (TROUBLE4) The following visual conditions indicate a probable defective touche control circuit or membrane switch assembly. 1. Incomplete segments 1) Segments missing. 2) Partical segments missing. 3) Digit flickering other than normal display slight flickering. 4) “ : 0 ” does not display when power is on. 2.
  • Page 27 TROUBLESHOOTING GUIDE (TROUBLE 6) Microwave Output power is low. First of all, check if output power is really low following “ measurement of the microwave output power” on page 29. CONDITION CHECK RESULT CAUSE REMEDY Output power Check the power Lower than Customer education Decrese in...
  • Page 28 TROUBLESHOOTING GUIDE MEMBRANE KEYBOARD CHECK PROCEDURE 1. Check the pad termination order and nomenclature PCB Termination PCB Connector 2. Type of encoding and pad names BAKED REHEAT SOUP POWER FRESH POTATO VEGETABLE POPCORN FROZEN BEVERAGE MUFFIN QUICK PIZZA START START LESS MORE LIGHT...
  • Page 29 TROUBLESHOOTING GUIDE 3. Key check procedure To determine if the membrane keyboard is defective or not, check the continuity of each pad(KEY) contacts with a multim- eter. pad : Between A and F 15) MORE pad : Between C and J pad : Between A and G 16) AUTO DEFROST pad : Between C and K...

  • Page 30: Measurement And Test

    MEASUREMENT AND TEST 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below. PROCEDURE 1. Microwave power output measurement is made with the microwave oven supplied at rated voltage and operated at ±...

  • Page 31: Microwave Radiation Test

    MEASUREMENT AND TEST 2. MICROWAVE RADIATION TEST CAUTION 1. Make sure to check the microwave leakage before and after repair or adjustment. 2. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy. 3. Do not place your hands into any suspected microwave radiation field unless the safe density level is known. 4.

  • Page 32: Component Test Procedure

    MEASUREMENT AND TEST 3. COMPONENT TEST PROCEDURE • High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. • It is neither necessary nor advisable to attempt measurement of the high voltage. •...
  • Page 33 MEASUREMENT AND TEST 5. Fuse If the fuse in the primary and monitor switch circuit is blown when the door is opened, check the primary and monitor switch before replacing the blown fuse. In case the fuse is blown by an improper switch operation, replace the defective switch and fuse at the same time.

  • Page 34: Wiring Diagram

    WIRING DIAGRAM...

  • Page 35: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. CIRCUIT CHECK PROCEDURE 1) Low voltage transformer check The low voltage transformer is located on the PCB Measuring condition : Input voltage : 120 V / Frequency : 60 Hz Terminal Voltage LOAD NO LOAD AC 24V AC 30V 8-10 AC 2.4V...
  • Page 36 PRINTED CIRCUIT BOARD PRINTED CIRCUITS BOARD MEASUREMENT POINT...
  • Page 37 PRINTED CIRCUIT BOARD 3) Display problems CAUSE MEASUREMENT RESULT REMEDY Poor contact between Check the voltage of 2.4VAC Fix the PIN1&25. P.C.B. and display filament. PIN1&PIN25. Refer to “ The display trou- Defective Display. Replace P.C.B. assembly. ble shooting data” below. White spot Loss of vaccum in the dis- White spot is generated on...
  • Page 38 PRINTED CIRCUIT BOARD 4) When there is no microwave oscillation a. When touching SRART pad, oven lamp does not turn on. Fan motor and turntable motor do not rotate, but cook indicator in display comes on. * Cause : RELAY 2 does not operate. refer to the Circuit Diagram (Point 3).

  • Page 39: Circuit Diagram

    PRINTED CIRCUIT BOARD 2. P.C.B. CIRCUIT DIAGRAM...

  • Page 40: P.c.b.location No

    In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr) PRINTED CIRCUIT BOARD 3. P.C.B.LOCATION NO KOT-123Q0A (3514321600) NAME SYMBOL SPECIFICATION PART CODE Q’...

  • Page 41: Exploded View And Parts List

    EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY Refer to Disassembly and assembly. 2. CONTROL PANEL ASSEMBLY Refer to Disassembly and assembly. 3. TOTAL ASSEMBLY...
  • Page 42  Caution: In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr) EXPLODED VIEW AND PARTS LIST REF.
  • Page 43  Caution: In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr) EXPLODED VIEW AND PARTS LIST REF.

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