Related Manuals for Daewoo KOC-970T1S
Summary of Contents for Daewoo KOC-970T1S
- Page 1 Service Manual Microwave Oven Model: KOC-970T1S KOC-970T2S KOC-980T10S KOC-980T20S 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) D o not operate or allow the oven to be operated w ith the door open. (b) M ake the follow ing safety checks on all ovens to be serviced before activating the m agnetron or other m icrow ave source, and m ake repairs as necessary: (1) Interlock operation, (2) P roper door closing, (3) S eal and sealing surfaces (arcing, w ear, and other dam age), (4) D am age to or loosening of hinges and latches, (5) E vidence 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 DE L KO C-970T1S KO C-970T2S PO W E R S UP PLY 230V~50H z 230V~50H z M IC RO W AV E 1450W 1450W G RILL 1200W 1200W C O N VE CTIO N 1550W 1550W PO W E R C O N SU M PTIO N A UTO CO O K 1850W... -
Page 5: External View
EXTERNAL VIEW 1. OUTER DIMENSION KOC-970T Fig.2 Side view Fig.1 Front view KOC980T Fig.1 Front view Fig.2 Side view... -
Page 6: Feature Diagram
EXTERNAL VIEW 2. FEATURE DIAGRAM KOC-970T 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 KOC980T 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 W hen blinking, the oven is W hen blinking, the oven is operating in "CO M BI" operating in "W EIG H T cooking m ode. D EFRO ST" cooking m ode. W hen blinking, the oven is W hen blinking, the oven is operating in "G RILL"... -
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 w hich is packed w ith each m agnetron to prevent m icrow ave leakage.
- Page 14 DISASSEMBLY AND ASSEMBLY 6. To remove control panel assembly (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 nine screws which secure the main and sub PCB assembly to control panel.
- Page 15 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 After replacing the door assem bly, perform a check of correct alignm ent w ith the hinge and cavity front plate.
- Page 16 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. Tighten two screws.
- Page 17 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 18 DISASSEMBLY AND ASSEMBLY 12. To remove convection part assembly (KOC980T only) (1) Remove cover *b and cover insulator *b protecting convection part assembly. - release two lances of cover insulator *b. (2) Remove four screws which secure the convection part assembly to the cavity rear plate. (3) Remove a nut holding the convection fan and the pipe.
-
Page 19: 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 20: 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 21 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 22 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 voltage fuse Continuity R eplace high voltage fuse Replace Continuity Defective C heck con tinuity of high...
- Page 23 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. C O N D ITIO N C H EC K R ESU LT C AU SE R EM ED Y A djus t or...
- Page 24 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 25 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 26: 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 27: Electrical Continuity Check Of Interlock Switch
MEASUREMENT AND TEST 2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH NOTE R em ove the power 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 28: Microwave Radiation Test
MEASUREMENT AND TEST 3. MICROWAVE RADIATION TEST WARNING M ake sure to check the m icrowave leakage before and after repair of adjustm ent. Always start m easuring of an unknown field to assure safety for operating personnel from m icrow ave energy. D o not place your hands into any suspected m icrowave radiation field unless the safe density level is know n. -
Page 29: 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. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor. 1. -
Page 30: Wiring Diagram
WIRING DIAGRAM... -
Page 31: Schematic Diagram
SCHEMATIC DIAGRAM... - Page 32 SCHEMATIC DIAGRAM...
- Page 33 SCHEMATIC DIAGRAM...
-
Page 34: Exploded Views And Parts List
EXPLODED VIEWS AND PARTS LIST 1. KOC-970T EXPLODED VIEW... - Page 35 EXPLODED VIEWS AND PARTS LIST PARTS LIST REF NO. PART CODE PART NAME DESCRIPTION REMARK A 00 3511708310 DO O R A S KO C-970T P KC PS W Q 200 CO NTRO L-PA N EL AS KO C-970T1S B 00 P KC PS W Q 230 CO NTRO L-PA N EL AS KO C-970T2S...
- Page 36 EXPLODED VIEWS AND PARTS LIST REF NO. PART CODE PART NAME DESCRIPTION REMARK 3510603610 BR AC KE T H EATE R *T SE CC T0.6 7S312X 40A 1 SC RE W S PE C IA L TT2 H EX FG 4*10 M FZN 3512803000 HE ATER M IRA CLO N 115V 550W...
- Page 37 EXPLODED VIEWS AND PARTS LIST 2. KOC-980T EXPLODED VIEW...
- Page 38 EXPLODED VIEWS AND PARTS LIST PARTS LIST REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK A 00 3511708310 DO O R AS K O C 980T PKC P SW YA00 CO NTRO L-PAN EL AS KO C 980T10S (SIM UL.) B 00 P KC P SW YA00 CO NTRO L-PAN EL AS...
- Page 39 EXPLODED VIEWS AND PARTS LIST REF N O. PAR T CODE PART NA ME DESCRIPTION Q’TY REMA RK F 39 3517302500 F O A M C R 10T *180*30 F 40 3518002400 M A G NE T R O N 2M 218J(M F )I F 41 7S 427W 40A 1...
-
Page 40: Printed Wiring Board
PRINTED WIRING BOARD 1. CIRCUIT CHECK PROCEDURE (1) Low Voltage Transformer(DMR-101FS) check - The low voltage transformer is located on the P.C.B. - Measuring condition (input voltage) : 230 VAC / 50 Hz KOC-970T/980T L.V.T. : DMR-101FS Terminal Voltage 1 - 2 230VAC/50Hz 4 - 5 13.0 VAC... - Page 41 PRINTED WIRING BOARD (3) Display Problems CAUSE MEASUREMENT RESULT REMEDY P oor contact between P.C .B. Fix the pin 1 & 25 on C heck the voltage of display pin 1 & 25 2.6 VA C and display filam ent the P.C.B .
- Page 42 PRINTED WIRING BOARD (4) Case of no microwave oscillation (a) 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 3 (RY3) does not operate. KOC-970T/980T - Check method STAGE...
- Page 43 PRINTED WIRING BOARD - Check method STAGE POINT A POINT B R E LAY 5 O N -5 VD C G N D R E LAY 5 O FF G N D -12 V D C (5) Case of no heating of upper heater When touching “TEMP COOK &...
- Page 44 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. KOC-970T/980T - Check method STAGE POINT A POINT B Door opened O pen -5 V DC Door closed Closed...
-
Page 45: Circuit Diagram
P.C.B. CIRCUIT DIAGRAM 1. KOC-970T/980T... - Page 46 P.C.B. CIRCUIT DIAGRAM KOC-970T/980T PCB ASS’Y PART LIST NAME SYMBOL SPECIFCATION PART CODE Q TY M 208 92X 195 3514314920 PC B M 209 86X 159.5 3514314930 TR A N S P O W ER LV T1 D M R -101FS 5E P V041351 HO LDE R VFD 3513002600...
- Page 47 P.C.B. CIRCUIT DIAGRAM NAME SYMBOL SPECIFCATION PART CODE Q TY CO NN EC TO R W AFE R CN 2 35312-0310 30166M 5030 CO NN EC TO R W AFE R CN 1 35313-0210 30166M 7020 CO NN EC TO R W AFE R CN 4 35328-0610 4C W 3061M X 0...
- Page 48 DAEWOO ELECTRONICS CO., LTD 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX : DWELEC K28177-8 CABLE : “DAEWOOELEC” E-mail : G7F00E@web.dwe.co.kr FAX : 02) 360-8184 TEL: 02) 360-8178~8182 S/M NO. : C970T1S001 PRINTED DATE : JUL. 19988...