Summary of KOR-868G
Page 1
Service manual model : kor-868g microwave oven may 2007 s/m no. : r868g7a001.
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-868g7a27 power supply 120v~60hz, single phase with grounding power microwave 1350w consumption grill combination microwave energy output 900w microwave frequency 2450mhz outside dimensions (w x h x d) 495 x 294 x 388 mm (19.5 x 11.6 x 15.3 in) cavity dimensions (w x h x d) 320 x 228 x 38...
Page 5: External View
4 external view 1. Outer dimension 495 384 294.
Page 6
5 1. Door seal door seal maintains the microwave within the oven cavity and prevents microwave leakage. 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. Door screen allows viewing of f...
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 cl...
Page 8: Installation
7 installation 1. Steady, flat location. This microwave oven should be set on a steady, flat surface. 2. Leave space behind and side. All air vents should be kept a clearance. If all vents are covered during operation, the oven may be overheated and, eventually, cause oven failure. 3. Away from radi...
Page 9: Operations and Functions
8 operations and functions 1. Connect the mains 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. Close the door securely. 4. When the oven door is opened, the li...
Page 10: Disassembly and Assembly
9 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 safe during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible da...
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 two 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...
Page 12
11 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 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 ...
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 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’ loosen two s...
Page 14
13 5. To remove control panel parts. 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 fun...
Page 15
14 6. To remove high voltage capacitor. 1) remove a screw which secure the grounding ring terminal of the h.V. Diode and the capacitor holder. 2) remove the h.V. Diode from the capacitor holder. 3) reverse the above steps for reassembly. ◆ high voltage circuit wiring 7. To remove magnetron. 1) remov...
Page 16
15 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. 6) reverse the above steps for reassem...
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: Troubleshooting Guide
17 (trouble 1) oven does not operate at all ; any inputs can not be accepted. Troubleshooting 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 magnetron defective mag- netron result no continuity cause remedy replace outlet has proper volt- age fuse does not blow. Condition check check continuity of primary inter- lock switch malfunction of pri- mary interlock switch result no continuity cause remedy ...
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 rectifi...
Page 21
20 (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 p...
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 procedure 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. 85mm(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 : 120v/frequency : 60hz 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.
Page 28
27 3. When there is no microwave oscillation 1) when touching the start pad, 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 the start pad, oven lamp ...
Page 29
28 2. Pcb circuit diagram.
Page 30
29 3. P.C.B. Location no. No. Name symbol specification part code q'ty 1 buzzer bz1 bm-20k 3515600100 1 2 c array ca1 7p(6) 102 m 50v cn6xb-102m 1 3 capacitor elec ec1 50v rs imf cexe1h109a 1 4 capacitor elec ec2 25v rss 1000uf dezf1e102v 1 5 connector wafer cn1 yw396-02v 3519150520 1 6 connector fi...
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 f11 f12 f13 f14 f15 f16 f17 f18 f19 f20 f21 f22 f23 f24 f25 f26 f27 f28 f29 f30 f31 f32 f33 f34 f35 f36 f37 f39 f38 f40 f41 f42 f43 f01 f...
Page 32
31 no part code part name description q'ty remark a00 3511710720 door as kor-86050s 1 b00 pkcpswnf10 control-panel as kor-860a1a 1 f01 3510805400 cabinet as kor-81150s 1 f02 7272400811 screw taptite tt3 trs 4x8 mfzn 3 f03 3516109900 cavity as kor-86150s 1 f04 7122401211 screw tapping t2s trs 4x12 mf...
Page 33
S/m no. : r868g7a001 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: spet.2006.