Daewoo KOC-972T0S Service Manual
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Daewoo KOC-972T0S Service Manual

Daewoo KOC-972T0S Service Manual

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Service Manual
Microwave Oven
Model: KOC-972T0S
DAEWOO ELECTRONICS CO., LTD.
S/M No. : C972T0S002
KOC-972T2S
KOC-982T1S
KOC-982T2S
KOC-983T1S
KOC-983T2S
KOC-984T1S
KOC-984T2S
KOC-985T1S
KOC-985T2S

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  • Page 1 S/M No. : C972T0S002 Service Manual Microwave Oven Model: KOC-972T0S KOC-972T2S KOC-982T1S KOC-982T2S KOC-983T1S KOC-983T2S KOC-984T1S KOC-984T2S KOC-985T1S KOC-985T2S DAEWOO ELECTRONICS CO., LTD.

  • 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 w ith the door open. (b) M ake the following safety checks on all ovens to be serviced before activating the m agnetron or other m icrowave source, and m ake repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other dam age), (4) Dam age to or loosening of hinges and latches, (5) Evidence of dropping or abuse.

  • Page 3: Safety And Precautions

    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 trained service personnel should make repairs.) (1) A broken door hinge.

  • Page 4: Specifications

    SPECIFICATIONS M O D E L KO C -972T 0S K O C-972T 2S P O W E R S U P P LY 230V ~50H z 230V~50H z M IC RO W AVE 1450W 1450W G R ILL 1200W 1200W C O N VE C T IO N 1550W...

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION KOC-972T KOC-982T/983T/984T/985T...

  • Page 6: Feature Diagram

    EXTERNAL VIEW 2. FEATURE DIAGRAM KOC-972T 1. Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 2. Door hook - When the door is closed, it will automatically shut. If the door is opened while the oven is operating, the magnetron will immediately stop operating.
  • Page 7 EXTERNAL VIEW KOC-982T/983T/984T/985T 1. Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 2. Door hook - When the door is closed, it will automatically shut. If the door is opened while the oven is operating, the magnetron will immediately stop operating.

  • Page 8: Installation

    This appliance is supplied with cable of special type, which, if damaged, must be repaired with cable of same type. Such a cable can be purchased from DAEWOO and must be installed by a Qualified Person. 6. Examine the oven after unpacking for any damage such as: A misaligned door, broken door or a dent in cavity.

  • Page 9: Control Panel

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

  • Page 10: Disassembly And Assembly

    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 danger from a short circuit. You are asked to observe the following precautions carefully.
  • Page 11 DISASSEMBLY AND ASSEMBLY 1. To remove cabinet (1) Remove four screws on cabinet back. (2) Push the cabinet backward. 2. To remove guide wind assembly (1) Remove two screws for earthing and for fixing to rear-plate. (2) Remove the noise filter from the guide wind. (3) Pull the fan from the motor shaft.
  • Page 12 DISASSEMBLY AND ASSEMBLY 3. To remove H.V.transformer (1) Remove four screws which secure the H.V.transformer to the base plate. (2) Remove the H.V.transformer. (3) Reverse the above steps for reassembly. 4. To remove high voltage capacitor (1) Remove a screw which secure the grounding ring terminal of the H.V.
  • Page 13 DISASSEMBLY AND ASSEMBLY 5. To remove magnetron (1) Remove three screws which secure the magnetron. (2) Remove the magnetron. (3) Reverse the above steps for reassembly. CAUTION N ever install the m agnetron w ithout the m etallic gasket plate which is packed w ith each m agnetron to prevent m icrow ave leakage.
  • Page 14 DISASSEMBLY AND ASSEMBLY 6. To remove control panel assembly KOC-972T, KOC-982T (1) Remove a screw which secure the control panel assembly to the oven front plate. At the same time, draw forward the control panel assembly from the oven front plate. (2) Remove nine screws which secure the main and sub PCB assembly to control panel.
  • Page 15 DISASSEMBLY AND ASSEMBLY KOC-983T (1) Remove a screw which secure the control panel assembly to the oven front plate. At the same time, draw forward the control panel assembly from the oven front plate. (2) Remove ten screws which secure the main and sub PCB assembly to control panel.
  • Page 16 DISASSEMBLY AND ASSEMBLY KOC-984T (1) Remove a screw which secure the control panel assembly to the oven front plate. At the same time, draw forward the control panel assembly from the oven front plate. (2) Remove the dial knob. (3) Remove ten screws which secure the main and sub PCB assembly to control panel.
  • Page 17 DISASSEMBLY AND ASSEMBLY KOC-985T (1) Remove a screw which secure the control panel assembly to the oven front plate. At the same time, draw forward the control panel assembly from the oven front plate. (2) Remove the dial knob. (3) Remove ten screws which secure the main and sub PCB assembly to control panel.
  • Page 18 DISASSEMBLY AND ASSEMBLY 7. 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 steps for reassembly. NOTE A fter replacing the door assem bly, perform a check of correct alignm ent with the hinge and cavity front plate.
  • Page 19 DISASSEMBLY AND ASSEMBLY KOC-983T (1) Remove the gasket door. (2) Remove the door seal ass’y. (3) Remove the hook and spring. (4) Remove the barrier-screen *o. REF. NO. PART CODE P ART NAM E DESCRIPTION REMA RK A 01 3511708400 DO O R SE A L AS K O C-971C0S A 02...
  • Page 20 DISASSEMBLY AND ASSEMBLY KOC-984T, KOC-985T (1) Remove the gasket door. (2) Remove a screw holding the handle. (3) Remove the handle from the frame door. (4) Remove the door seal ass’ y. (5) Remove the hook and spring. (6) Remove the barrier-screen *o. REF.
  • Page 21 DISASSEMBLY AND ASSEMBLY 9. 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. •...
  • Page 22 DISASSEMBLY AND ASSEMBLY 10. To remove motor syncro and under heater (1) Cut the syncro motor cover parts from the base plate. (2) Remove two screws which secure the motor syncro and supporter to bracket syncro motor. (3) Remove two screws and under heater assembly in cavity 11.
  • Page 23 DISASSEMBLY AND ASSEMBLY KOC-982T,KOC-983T,KOC-984T,KOC-985T (1) Remove two screws which secure the cover insulator *t to top plate. (2) Remove the harness between heaters. (3) Remove two screws for removing heater brackets. (4) Remove heaters. (5) Reverse the above steps for reassembly. 12.

  • Page 24: 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 microwave. 1.

  • Page 25: Trouble Shooting Guide

    TROUBLE SHOOTING GUIDE Following 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 26 TROUBLE SHOOTING GUIDE CON DITION CHECK RESULT CAUSE REM EDY R eplace C heck con tinuity of D efective O utlet has m agn etron C ontinuity m agn etron proper voltage Fuse does not blow. R eplace D efective C heck con tinuity of noise C ontinuity noise filter board...
  • Page 27 TROUBLE SHOOTING GUIDE (TROUBLE 3) No microwave oscillation even though fan motor rotates. CON DITION CHECK RESULT CAUSE REM EDY N o m icrowave C heck con tinuity of high oscillation Continuity voltage fuse R eplace high voltage fuse Replace Continuity Defective C heck con tinuity of high...
  • Page 28 TROUBLE SHOOTING GUIDE (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. CON DITION CHECK RESULT CAUSE REM EDY A djus t or M alfunction C heck con tinuity of Turn table...
  • Page 29 TROUBLE SHOOTING GUIDE (TROUBLE 6) The following visual conditions indicate a probable defective touch control circuit or button P.C.B. assembly. 1. Incomplete segments (1) Segments missing (2) Partial segments missing (3) Digit flickering other than normal fluorescent slight flickering (4) 0 does not display when power is on. 2.
  • Page 30 TROUBLE SHOOTING GUIDE BUTTON KEYBOARD CHECK PROCEDURE 1. Type of button names (key metrix and circuit diagram) The tact switch keyboard consists of 10 keys which configurations are described above. 2. Key check procedure To determine if the tact switch keyboard is defective or not, check the continuity of each button(key) contacts with a multimeter.

  • Page 31: 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 wit the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1000 ±...

  • Page 32: Electrical Continuity Check Of Interlock Switch

    MEASUREMENT AND TEST 2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH NOTE R em ove the pow er plug from the w all receptacle before testing. PROCEDURE 1. Primary interlock switch (1) Disconnect two connectors from primary interlock switch. (2) Connect the ohm-meter leads between the terminals of the primary interlock switch. 2.

  • Page 33: Microwave Radiation Test

    MEASUREMENT AND TEST 3. MICROWAVE RADIATION TEST WARNING M ake sure to check the m icrow ave leakage before and after repair of adjustm ent. A lw ays start m easuring of an unknow n field to assure safety for operating personnel from m icrow ave energy. D o not place your hands into any suspected m icrow ave radiation field unless the safe density level is know n.

  • Page 34: Component Test Procedure

    MEASUREMENT AND TEST 4. 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 35: Wiring Diagram

    WIRING DIAGRAM...

  • Page 36: Schematic Diagram

    SCHEMATIC DIAGRAM        ...
  • Page 37 SCHEMATIC DIAGRAM         ...
  • Page 38 SCHEMATIC DIAGRAM     ...

  • Page 39: Exploded Views And Parts List

    EXPLODED VIEWS AND PARTS LIST 1. KOC-972T EXPLODED VIEW...

  • Page 40: Parts List

    EXPLODED VIEWS AND PARTS LIST PARTS LIST REF NO. PAR T CODE PART NAM E DES CRIPTION Q TY REMA RK A 00 3511708320 D O O R A S K O C-972T PK C P SW Q 300 C O N T R O L-PA N E L A S K O C-972T 0S B 00 PK C P SW Q 300...
  • Page 41 EXPLODED VIEWS AND PARTS LIST REF NO. PAR T CODE PART NAM E DES CRIPTION Q TY REMA RK F 35 3513002900 H O LD E R H E AT E ER B R AS S C 3604B D F 36 7391800011 N UT H E X 6N -1-8 M FZ N...
  • Page 42 EXPLODED VIEWS AND PARTS LIST 2. KOC-982T/983T/984T/985T EXPLODED VIEW...
  • Page 43 EXPLODED VIEWS AND PARTS LIST PARTS LIST REF NO. PART CODE PART NAME DESCRIPTION REMARK 3511708380 DOOR AS KOC-984T 3511708390 DOOR AS KOC-985T 3511710830 DOOR AS KOC-983T 3511708320 DOOR AS KOC-982T PKCPSWYB00 CONTROL-PANEL AS KOC-984T(SIMULTANEOUS) PKCPSWYC00 CONTROL-PANEL AS KOC-985T(SIMULTANEOUS) PKCPSWYE00 CONTROL-PANEL AS KOC-983T(SIMULTANEOUS) PKCPSWQ350...
  • Page 44 EXPLODED VIEWS AND PARTS LIST REF NO. PART C ODE PART NAM E DESC RIPTION RE MARK F 33 7S 422X4081 S CR E W S P E C IA L T T 2 T R S 4*8 S E M F Z N F 34 3517502700 P RO T E CT O R H E ATE R...

  • Page 45: Printed Wiring Board

    PRINTED WIRING BOARD 1. CIRCUIT CHECK PROCEDURE 1. Low Voltage Transformer check • The low voltage transformer is located on the P.C.B. • Measuring condition (input voltage) : 230 VAC / 50 Hz KOC-972T/982T KOC-983T/984T/985T L.V.T. : DMR -101FS L.V.T. : DMR -984FS Term inal Voltage Term inal...
  • Page 46 PRINTED WIRING BOARD 3. Display Problems CA USE MEASUREME NT RESULT R EMEDY P oor contact betw een C heck the voltage of display pin 1 & 2.6 VA C Fix the pin 1 & P.C.B . and display 25 on the P.C .B . filam ent T he display has som e R efer to T he display trouble...
  • Page 47 PRINTED WIRING BOARD 4. Case of no microwave oscillation (1) Situation : When touching M/W button, oven lamp turns on, fan motor and turntable motor rotate and cook indicator in the display comes on. • CAUSE : Relay 1 (RY1) does not operate. KOC-972T/982T KOC-983T/984T/985T •...
  • Page 48 PRINTED WIRING BOARD • Check method STAGE POINT A POINT B R ELAY O N +5 V D C G N D R ELAY O F F G ND +12 V D C 5. Case of no heating of upper heater When touching TEMP COOK &...
  • Page 49 PRINTED WIRING BOARD 7. Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop. KO C-972T/982T KO C-983T/984T/985T • Check method STAGE POIN T A POINT B D oor opened O pen +5 V D C...

  • Page 50: Circuit Diagram

    P.C.B. CIRCUIT DIAGRAM 1. KOC-972T/982T...
  • Page 51 P.C.B. CIRCUIT DIAGRAM KOC-972T/982T PCB ASS’ Y PART LIST NAME SYMBOL SPECIFCATION PART CODE Q′TY M212 93X197 3514314940 M213 84X192 3514314950 TRANS POWER LVT1 DMR-101FS 5EPV041351 HOLDER VFD PP KOR-9930 3513002000 BUZZER BM-20K 3515600100 DIGITRON SVM-5SS13 DSVM5SS13- RESONATOR CERA CST4.00MGW 5PCST400MG MB89143AP-171,972T 141SC871C0...
  • Page 52 P.C.B. CIRCUIT DIAGRAM KOC-983T/984T/985T...
  • Page 53 P.C.B. CIRCUIT DIAGRAM KOC-983T/984T/985T PCB ASS’Y PART LIST Q ′ ′ ′ ′ TY N AM E SYM B OL SPEC IFC ATIO N PAR T C OD E M218 93X213 3514314980 M219 91.5X163 3514314990 BUZZER BM-20K 3515600100 CONNECTOR WAFER 35312-0310 30166M5030 CONNECTOR WAFER...

This manual is also suitable for:

Koc-972t2sKoc-983t1sKoc-983t2sKoc-982t1sKoc-984t1sKoc-982t2s ... Show all

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