DAEWOO ELECTRONICS KOG-875T0S Service Manual
  1. Manuals
  2. Brands
  3. DAEWOO ELECTRONICS Manuals
  4. Microwave Oven
  5. KOG-875T0S
  6. Service manual
DAEWOO ELECTRONICS KOG-875T0S Service Manual

DAEWOO ELECTRONICS KOG-875T0S Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Service Manual
Microwave Oven
Model : KOG-875T0S
DAEWOO ELECTRONICS CO., LTD.
OVERSEAS SERVICE DEPT.

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the KOG-875T0S and is the answer not in the manual?

Questions and answers

Related Manuals for DAEWOO ELECTRONICS KOG-875T0S

Summary of Contents for DAEWOO ELECTRONICS KOG-875T0S

  • Page 1 Service Manual Microwave Oven Model : KOG-875T0S DAEWOO ELECTRONICS CO., LTD. OVERSEAS SERVICE DEPT.

  • 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) evidence of dropping or abuse.

  • Page 3: Proper Use And Service Precautions

    PROPER USE AND SERVICE 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 trained service personnel should make repairs.) 1) A broken door hinge.

  • Page 4: Specifications

    SPECIFICATIONS POWER SUPPLY 230V ~ , 50Hz, single phase with earthing POWER CONSUMPTION 1,400 W MICROWAVE OUTPUT POWER 900 W (IEC 705) FREQUENCY 2,450 MHZ GRILL POWER CONSUMPTION 1,400 W COMBINATION HEATING POWER CONSUMPTION 2,750 W OUTSIDE DIMENSIONS (W X D X H ) 501 X 320 X 413 mm (19.7 X 12.6 X 16.2 in.) CAVITY DIMENSIONS (W X D X H) 310 X 229 X 320 mm (12.2 X 9.0 X 12.6 in.)

  • Page 5: Names And Function Of Parts

    NAMES AND FUNCTION OF PARTS DEFROST GRILL COMBI WEIGHT TIME PROGRAM COOK WEIGHT TIME DEFROST DEFROST GRILL COMBI +1MIN. PROGRAM COOK 1. Roast Beef 2. Roast Pork 3. Roast Chicken 4. Fish Fillets 5. Vegetable SPEEDY COOK STOP/CLEAE START/CLOCK 1 Door latch—When the door is closed it will 6 Heater—Grill or Combi-Mode has need for the heater.

  • Page 6: Control Panel

    CONTROL PANEL When blinking, the oven is operating in COMBI cooking. When blinking, the oven is operating in GRILL When blinking, the oven is When blinking, the oven operating in WEIGHT DEFROST is operating in DEFROST GRILL COMBI WEIGHT TIME MICROWAVE COOK When blinking, the oven is When blinking, the oven is...

  • Page 7: Operation

    OPERATION TO STOP THE OVEN WHILE THE OVEN IS OPERATING 1. Press (STOP / CLEAR) button. - The (STOP) indicator starts blinking. - You can restart the oven by touching (START) button. - Touch once more to erase all instruction except clock. 2.

  • Page 8: How To Set The Oven Controls

    HOW TO SET THE OVEN CONTROLS TIPS : • Be sure to read the cookbook’s introduction before operating the oven. • Also remember to read this operating instruction for proper safety information and instruction before using the oven. • See the cookbook for specific recipes. •...
  • Page 9 HOW TO SET THE OVEN CONTROLS SETTING THE CONTROLS 1. Press button. The display will show “P-HI”. This oven has 10 power levels from P-HI to P-10. 2. Press the button to select the desired microwave power level. For example: power level 80 Press button two times more.
  • Page 10 WEIGHT WEIGHT DEFROST DEFROST • NOTE : This mode allows you to set weight from 0.1Kg 0.1Kg to 2.9Kg. • During the defrosting operation turn over the food after 4 beeps ound 4 times for cpmplete defrosting. SETTING THE CONTROLS WEIGHT DEFROST 1.
  • Page 11 PROGRAM COOK PROGRAM • NOTE : There is Pre-Programmed cooking of five menu (1-5) • Don’t need to set cooking times, power or function. SETTING THE CONTROLS PROGRAM 1. Press PROGRAM COOK COOK button Then, “AC-1” will show in the display. AUTO COOK 2.
  • Page 12 SPEEDY COOK SPEEDY COOK NOTE : The cooking time increases by 30 seconds from 30 seconds to 5 minutes. SETTING THE CONTROLS START/CLOCK 1. Press button. 2. “30” will appear in the display window. 3. Whenever this button is pressed, cooking time is increased by 30 seconds.

  • Page 13: Interlock Mechanism Functions And Adjustments

    INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS 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 switch When the door is closed, the hook locks the oven door.
  • Page 14 (2) Monitor interlock switch When the door is closed, the hook pushes the lever forward, and pushes the Latch Lever downward the lever press the button of the interlock monitor switch to bring it under ‘OFF’ condition. The latch Lever press the button on the secondary interlock switch to bring it under ‘ON’...

  • Page 15: Precautions For Disassembly And Repair

    PRECAUTIONS FOR DISASSEMBLY AND REPAIR - 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 danger from a short circuit.

  • Page 16: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY 1. To remove cabinet. (Refer to Fig. 1) 1) Remove four screws on cabinet back. 2) Push the cabinet backward. Fig. 1 2. To remove guide wind assembly. (Refer to Fig. 2) 1) Release two screws 2. 2) Remove back-cover 3.
  • Page 17 3. To remove H.V. transformer. (Refer to Fig. 3) 1) Remove four screws 1 which secure the H.V. Transformer bracket to the base plate. 2) Remove the H.V. Transformer 2. Fig. 3 High voltage circuit wiring Mognetron H.V. Copacitor H.V.Diode H.V.
  • Page 18 4. To remove magnetron. (Refer to Fig. 4) 1) Remove three screws 2 which secure the magnetron 1. 2) Remove the magnetron. 3) Reverse the above steps for reassembly. Fig. 4 CAUTION : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage.
  • Page 19 ABS XR-401 COATING 3516907200 BUTTON FUNCTION ABS XR-401 COATING 3516906320 BUTTON FUNCTION ABS XR-401 COATING 3514320400 PCB SUB AS KOC-984T1S 7621301011 SCREW TAPPING T2S PAN 3X10 PW MFZN 3514322000 PCB MAIN AS KOG-875T0S 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN...
  • Page 20 6. To remove door assembly. (Refer to Fig. 7) 1) Remove two screws 1 which secure to hinge. 2) Remove door assembly 2. 3) Remove door above for reassembly taking case to replace fixing glue. 7. To remove door part. (Refer to Fig. 8) (1) Remove the Gasket door.
  • Page 21 8. Method to reduce the gap between the door seal and the oven front surface. (1) To reduce gap located on part ‘A’. 1) Remove the cabinet. 2) Loosen a screw on top door hinge, then push the door to contact the door seal to oven front surface.
  • Page 22 9. To remove tray motor and under Heater. (Refer to Fig. 9) 1) Cut the tray motor cover parts from the base plate (Refer to Fig. 9). 2) Remove two screws 2 which secure the tray motor 1. CUTTING(5EA) Fig. 9...
  • Page 23 10. To remove grill heater assembly. (Refer to Fig. 10) Fig. 10 1) Remove the cabinet. 1 , and remove the Top cover 2. 2) Release two screws 3) Release a screws 3 , and remove Air Guide outlet 4. 4) Release grill Heaters Bracket 5.

  • Page 24: Trouble Shooting Guide

    TROUBLE SHOOTING GUIDE 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 lead wire from these parts and check continuity with the AC plug removed.
  • Page 25 Condition Check Result Cause Remedy Outlet has Check Defective magnetron Replace proper voltage. continuitymagnetron Continuity Fuse does not blow. Check continuity of Defective line filter Replace noise filter board Continuity board Check continuity of Open power supply Adjust. Continuity power supply cord cord Defective touch control Normal...
  • Page 26 (TROUBLE 3) No microwave oscillation even though fan motor rotates. Condition Check Result Cause Remedy No microwave Check continuity of oscillation high voltage fuse Continuity Replace high voltage fuse Check continuity of Defective high Replace Continuity high voltage capacitor voltage transformer terminals with wires removed Check continuity of...
  • Page 27 (TROUBLE 4) Display shows all figures selected, but oven does not start cooking, even though desired program and time are set and start pad is tapped. Condition Check Result Cause Remedy Turn table motor, and Check continuity Malfunction of Adjust or oven lamp do not turn on of primary Primary interlock...
  • Page 28 (TROUBLE 5) The following visual conditions indicate a probable defective touch control circuit or membrance switch assembly 11. Incomplete segments, (A) Segments missing. (B) Partical segments missing. (C) Digit flickering other than normal fluorescent slight DEFROST flickering. GRILL COMBI WEIGHT TIME (D) ”0”...
  • Page 29 BUTTON KEYBOARD CHECK PROCEDURE 1. Type of encoding and button names. TIME GRILL WEIGHT M / W CN101 DEFROST DEFROST HLEM15R-1 SPEEDY +1 min COMBI COOK PROGRAM COOK STOP START CLEAR TACK SWITCH KPT-1115AMX10 100k RA3 RGLD7X104J CA1 B7102M Fig. 11 Key Matrix and circuit diagram The button keyboard consists of 12 keys whose configurations are described above and provides 8 pad terminations to be connected to the touch control circuit as in Fig.

  • Page 30: Measurement

    MEASUREMENT 1. Microwave Output Power 1-1. Standard Method Microwave output power can be checked by indirectly CAUTION : measuring the temperature rise of a certain amount of water 1. Water load should be measured exactly to 1 liter. exposed to the microwave as directed below. 2.
  • Page 31 3-3. Procedures 2-2. Judgement The value of resistance should be applied to the value 1) Prepare 600cc glass or plastic container. specified below. 2) Pour 275±15 milliliters of tap water initially at 68±9˚F (20±5˚C) in the container. Door Open Closed 3) Place it at the center of the tray and set it is a cavity.

  • Page 32: Component Test Procedure

    COMPONENT TEST PROCEDURE 1. High voltage is present at the high voltage terminal of the high voltage transformer during any cook cycle. 2. It is neither necessary nor advisable to attempt measurement of the high voltage. 3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor (see page 20).

  • Page 33: Wiring Diagram

    WIRING DIAGRAM...

  • Page 34: Schematic Diagram

    SCHEMATIC DIAGRAM IDLE CONDITION MICROWAVE COOKING CONDITION...
  • Page 35 GRILL COOKING CONDITION COMBI COOKING CONDITION...

  • Page 36: Exploded Views And Parts List

    EXPLODED VIEWS AND PARTS LIST...
  • Page 37 PART NAME SPEC PART CODE Q’TY DOOR AS KOG-875T0S 3511710030 CONTROL-PANEL AS KOG-875T0S PKCPSWVG00 CAVITY AS KOG-87050S 3516108660 REAR PLATE *0 SBHG-1 T0.6 3516503900 COVER WAVE GUIDE MICA T0.35 3511403800 SCREW TAPPING T1 BIN 4X8 MFNI 7113400814 TRAY RACK AS...

  • Page 38: Printed Wiring Board

    PRINTED WIRING BOARD 1.CIRCUIT CHECK PROCEDURE 1) Low voltage transformer (DMR-984FS) check. The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage: 230VAC/50Hz Terminal Voltage 1 - 3 230VAC /50Hz 6 - 7 10.5 VAC 7 - 8 10.5 VAC 9 - 10 2.6 VAC...
  • Page 39 3) Display problems CAUSE MEASUREMENT RESULT REMEDY Poor contact between P.C.B. Check the voltage of display pin 2.6VAC Fix the pin 1 & 25 on and display filament. 1 & 25 the P.C.B. The display has some trouble Refer to “The display trouble shooting Replace P.C.B.
  • Page 40 4) When there is no microwave oscillation. (1) When touching “M/W” button, oven lamp turns on. Fan motor and turntable motor rotate and cook indicator in display comes on. * Cause : Relay 1 (RY1) dose not operate. Q7 KRC106M G5G-1A-DT MAGNETRON 1N4004...
  • Page 41 CHECK METHOD POINT STAGE RY5 “ON” +5VDC RY5 “OFF” +12VDC 5) When there is not upper heater. When touching “GRILL & COMBI” button, oven lamp turns on. Fan motor and turntable motor rotate and cook indicator in display comes on. * Cause : Relay 2 (RY2) dose not operate.

  • Page 42: Board Diagram

    6) When the door is opened during operation, the count down timer does not stop. 35313-0210 4.7K 100K 4.7K CHECK METHOD POINT STAGE Door opened Open +5VDC Doop closed Closed NOTE : Check the state of the secondary interlock switch. 7) When “...
  • Page 43 P.C.B CURCUIT DIAGRAM...

  • Page 44: Circuit Diagram

    MAIN PCB ASS'Y PART LIST NAME SYMBOL SPECIFICATION PART CODE Q'TY M218 93X213 3514314980 M219 91.5X163 3514314990 BUZZER BM-20K 3515600100 CONNECTOR WAFER 35313-0210 30166M7020 CONNECTOR WAFER 515 80-15 Q4CW215SBD0 CONNECTOR WAFER 35328-0610 4CW3061MX0 CONNECTOR WAFER CN101 515 81-15 4CW215RBD0 DIGITRON SVM-5SS13 DSVM5SS13- HOLDER VFD...

  • Page 46: Sub P.c.b. Ass'y Part List

    DAEWOO ELECTRONICS CO., LTD. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” FAX: 02) 82-32-510-7630 TEL: 02) 82-32-510-7628 http://www.dwe. daewoo.co.kr S/M NO. : G875T0S001 PRINTED DATE: NOV. 1999...

Table of Contents