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Daewoo KOR-868G7S Service Manual

Summary of KOR-868G7S

  • Page 1

    Service manual microwave oven model: kor-868g7s daewoo electronics corp. S/m no. : r868g7s001 http : //svc.Dwe.Co.Kr jun. 2003 ✔ 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...

  • 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 kor-868g7s power supply 230v-50hz, single phase with earthing power microwave 1350w consumption grill combination microwave energy output 900w microwave frequency 2450mhz outside dimensions (w x h x d) 495 x 294 x 384 mm (19.5 x 11.6 x 15.1 in) cavity dimensions (w x h x d) 320 x 237 x 343 m...

  • Page 5: External View

    4 external view 1. Outer dimension.

  • Page 6

    5 1 1 door seal door seal maintains the microwave within the oven cavity and prevents microwave leakage. 2 2 door hook when the door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating. 3 3 door screen allows viewing o...

  • Page 7

    6 0 9 8 2 6 1 4 3 5 7 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 (by weight) 4 power used to set power level. 5 defrost used to defrost foods.(by time) 6 clock used to set clock. 7 time ...

  • Page 8: Installation

    7 installation 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 a...

  • Page 9: Operations and Functions

    8 operations and functions wattage output chart the power-level is set by pressing the power pad. The chart shows the display, the power level and the percentage of power. This section includes useful information about oven operation. 1. Plug power supply cord into a 230v 50hz power outlet. 2. After...

  • Page 10: Disassembly and Assembly

    9 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 safe during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible d...

  • Page 11

    10 1. To remove cabinet 1) remove three screws on cabinet back. 2) push the cabinet backward. 2. To remove door assembly 1) remove one screw 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 ...

  • Page 12

    Ref no. Part code part name description q’ty remark a01 3512207900 frame door abs sg-175 sg-0760d 1 a02 2te16a27cl double tape 0.16t x 27mm clear 550m - a03 3517008200 barrier-screen*o san t1.5 1 a04 3515204100 stopper hinge*t as kor-63150s 1 a05 3511711800 door painting as kor-866t0s 1 a06 35170060...

  • Page 13

    12 4. Method to reduce the gap between the door seal and the oven front surface. (1) to reduce gap located on part ‘a’ loosen a 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’ loosen two scr...

  • Page 14

    Ref no. Part code part name description q’ty remark b01 3516911300 button door open abs sg-175, sg-0760d 1 b02 3518522240 membrane kor-868g7s 1 b03 441g430171 spring button swp dia 0.7 1 b04 3516729700 control panel abs sg-175 sg-0760d 1 b05 3516911100 button function-a abs sg-175 sg-0760d 1 b06 pkm...

  • Page 15

    14 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 16

    15 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 17

    16 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 18: Trouble Shooting Guide

    17 (trouble 1) oven does not operate at all ; any inputs can not be accepted. Trouble shooting guide following the procedure below to check if the oven is defective or not. 1. Check grounding before trouble checking. 2. Be careful of the high voltage circuit. 3. Discharge the high voltage capacitor....

  • Page 19

    18 condition check check continuity of primary inter- lock switch malfunction of pri- mary interlock switch result no continuity cause remedy adjust or replace turn table motor and oven lamp do not turn on check continuity of secondary interlock switch malfunction of sec- ondary interlock switch no ...

  • Page 20

    19 (trouble 3) no microwave oscillation even though fan motor rotates. Condition check result check continuity of high voltage capacitor terminals with wires removed continuity cause defective high voltage trans- former remedy replace no microwave oscillation check continuity of high voltage fuse re...

  • Page 21

    20 (trouble 4) the following visual conditions indicate a probable defective touch control circuit or membrane switch assembly. 1 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...

  • Page 22: Measurement and Test

    21 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 ...

  • Page 23

    22 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 24

    23 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 ...

  • Page 25: Wiring Diagram

    24 wiring diagram.

  • Page 26: Printed Circuit Board

    25 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 printed circuit board no check point remark 1 ic 1 pin 2, 21, 30, 34 -5...

  • Page 27

    26 measure point mp1 mp2.

  • Page 28

    27 3. When there is no microwave oscillation 1) when touching start pad, oven lamp does not turn on. Fan motor does 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 pad, oven lamp turns ...

  • Page 29

    28 2. Pcb circuit diagram.

  • Page 30

    29 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 c1~4,6 104 50v z axial cczf1h104z 5 5 capacitor elec ec1 50v rs 1mf cexe1h109a 1 6 capacitor elec ec...

  • Page 31: Exploded View and Parts List

    30 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 32

    Ref no. Part code part name description q'ty remark a00 3511712790 door as kor-868g7s 1 b00 pkcpswaq20 control-panel as kor-868g7s 1 f01 3510805400 cabinet kor-86150s 1 f02 7112401011 screw tapping t1 trs 4x10 mfzn 3 f03 3516109900 cavity as kor-86150s 1 f04 7112401011 screw tapping t1 trs 4x10 mfzn...

  • Page 33

    S/m no. : r868g7s001 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: jun. 2003.