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Daewoo KQG-868G7S Service Manual

Other manuals for KQG-868G7S: Operating Instructions & Cook Book
Manual is about: Daewoo Electronics MICROWAVE OVEN OPERATING INSTRUCTIONS KQG-868G7S

Summary of KQG-868G7S

  • Page 1

    Service manual microwave oven model: kqg-868g7s daewoo electronics corp. S/m no. : kqg868g7s1 may. 2004 ✔ 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 pri...

  • Page 2

    1 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- w...

  • Page 3: Safety and Precautions

    2 safety and precautions 1. For safe operation damage that allows the microwave energy (that cooks or heats the food) to escape will result in poor cooking and may cause serious bodily injury to the operator. If any of the following conditions exist, operator must not use the appliance. (only a trai...

  • Page 4: Specifications

    3 model kqg-868g7s power supply 230v 50hz 12a, single phase with earthing microwave 1350 w power consumption grill 1050 w combination 2200 w microwave energy output 900w microwave frequency 2450mhz outside dimensions (w x h x d) 495 x 294 x 394 mm cavity dimensions (w x h x d) 320 x 237 x 343 mm (12...

  • Page 5: External View

    4 external view 1. Outer dimension 1 2 3 4 5 q 0 7 9 8 6 2. Feature diagram 1 door seal - door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 2 cover heater 3 heating element 4 oven cavity 5 safety interlock system 6 metal rack 7 coupler - this fits over t...

  • Page 6

    5 0 9 8 2 4 w 1 e q 5 6 3 7 3. Control panel 1 display - cooking time, power level, present time are displayed. 2 auto cook - used to cook using a program or to reheat. 3 auto defrost - used to defrost foods.(for weight) 4 power - used to set power level. 5 defrost - used to defrost food.(for time) ...

  • Page 7: Installation

    6 1. Steady, flat location this microwave oven should be set on a steady, flat surface. This microwave oven is designed for counter top use only. 2. Leave space behind and side all air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually,...

  • Page 8: Operations and Functions

    7 operations and functions 1. Connect the mains lead to an electrical socket-outlet. 2. After placing the food in a suitable utensil, open the oven door and put it on the glass turntable, glass turntable must always be in place during cooking. 3. Close the door securely. 4. When the oven door is ope...

  • Page 9: Disassembly and Assembly

    8 disassembly and assembly cautions to be observed when trouble shooting. 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 electric shock or possible...

  • Page 10

    9 1. To remove cabinet 1) remove three screws on cabinet back. 2) push the cabinet backward. 2. To remove door assembly 1) remove a screws which secure the stopper hinge top. 2) remove the door assembly from top plate of cavity. 3) reverse the above for reassembly. Note : after replacing the door as...

  • Page 11

    10 3. To remove door parts. Ref no. Part code part name description q’ty remark a01 3512207900 frame door abs sg-175 sg-0760d 1 a02 3516005720 speical double tape tesa 4967 0.16t 35mm 0.78 a03 3517008210 barrier-screen *o acryl t1.5 smog 1 a04 3515204100 stopper hinge *t as kor-63150s 1 a05 35117118...

  • Page 12

    11 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. (2) to reduce gap located on part ‘b’. • loose...

  • Page 13

    5. To remove control panel parts. (1) remove five screws from the pcb manual as. (2) remove the lever door open from the control panel. (3) remove the button door open and the spring from the control panel. (4) remove the pcb manual as from the control panel. (5) remove the switch membrane, the butt...

  • Page 14

    13 note : never install the magnetron without the metallic gasket plate which is packed with each magnetron to pre- vent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 4mw/cm 2 for a fully assembled oven with door normally closed...

  • Page 15

    14 8. To remove wind guide assembly. 1) remove a screw for earthing. 2) remove the noise filter from the wind guide. 3) remove a screw which secure the wind guide assembly. 4) draw forward the wind guide assembly. 5) pull the fan from the motor shaft. 6) remove two screws which secure the motor shad...

  • Page 16

    15 10. To remove tray motor 1) remove the coupler in the cavity. 2) turn the set upside down. 3) cut the tray motor cover part from the base plate. 4) remove the tray motor cover. 5) remove a screw which secure the tray motor. 6) remove the tray motor. 7) reverse the above steps for reassembly excep...

  • Page 17

    16 12. To remove heater parts c05 c04 c03 c01 c02 heater top assembly : 3512803600 ref no. Part code part name description q’ty remark c01 3512765100 harness heater koc-970t1s teflon 1 c02 7112401011 screw tapping t1 trs 4x10 mfzn 2 c03 3510607800 bracket heater *t sbhg t0.5 2 c04 3512803700 heater ...

  • Page 18

    17 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 microwave. (1) primary interlock sw...

  • Page 19: Trouble Shooting Guide

    18 following the procedure below to check if the oven is defective or not. 1) check earthing before trouble checking. 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 ...

  • Page 20

    19 condition check check continuity of magnetron defective magnetron result no continuity cause remedy replace outlet has proper volt- age fuse does not blow. Condition check check continuity of primary interlock switch malfunction of primary interlock switch result no continuity cause remedy adjust...

  • Page 21

    20 (trouble 3) no microwave oscillation even though fan motor rotates. Check result cause condition remedy check continuity of high voltage capacitor terminals with wires removed continuity defective high voltage transformer defective high voltage fuse 1 replace no microwave oscillation check contin...

  • Page 22

    21 (trouble 4) the following visual conditions indicate a probable defective touch 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 po...

  • Page 23: 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 ove...

  • Page 24

    23 2. Microwave radiation test procedures 1. Prepare microwave energy survey meter, 600cc glass beaker, and glass thermometer 100˚c(212˚f). 2. Pour 275cc±15cc of tap water initially at 20±5˚c(68±9˚f) in the 600cc glass beaker with an inside diameter of approx. 95mm(3.5in.). 3. Place it at the center...

  • Page 25

    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. • before touching any oven components or wiring, always unplug the oven fro...

  • Page 26: Wiring Diagram

    25 wiring diagram.

  • Page 27: Printed Circuit Board

    26 1. Circuit check procedure 1. Low voltage transformer check the low voltage transformer is located on the p.C.B. Measuring condition: input voltage: 230v / frequency: 50hz 2. Voltage check - key check point - check method note 1. Refer to circuit diagram (point 4). 2. Secondary side voltage of th...

  • Page 28

    27 mp2 mp1.

  • Page 29

    28 3. When there is no microwave oscillation 1) when touching start button, oven lamp does not turn on. Fan motor do not rotate, but cook indicator in display comes on. ✻ cause : relay 2 does not operate. → refer to circuit diagram (point 3) - check method 2) when touching start button, oven lamp tu...

  • Page 30

    29 2. P.C.B. Circuit diagram.

  • Page 31

    30 3. P.C.B. Location no. No name symbol specification part code q'ty remark 1 buzzer bz1 bm-20k 3515600100 1 2 c array ca1 7p(6) 1000pf m 50v cn6xb-102m 1 3 capacitor cera c5 102 50v z axial cczb1h102k 1 4 capacitor cera c1~4,6,d6 104 50v z axial cczf1h104z 6 5 capacitor elec ec1 50v rs 1mf cexe1h1...

  • Page 32: Exploded View and Parts List

    31 1. Door assembly refer to disassembly and assembly. 2. Control panel assembly refer to disassembly and assembly. 3. Total assembly exploded view and parts list.

  • Page 33

    32 ✔ 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 no part code part name description q'ty a00 3511725100 door as...

  • Page 34

    S/m no. : kqg868g7s1 daewoo electronics corp. 686, ahyeon-dong mapo-gu seoul, korea c.P.O. Box 8003 seoul, korea telex: dwelec k28177-8 cable: “daewooelec” printed date: may. 2004.