S/M No. : OC154K8003 Service Manual Microwave Oven Model: KOC-154K8SA2 ✔ 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 refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). Feb.
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.
1. 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. 2) A broken door viewing screen. 3) A broken front panel, oven cavity. 4) A loosened door lock. 5) A broken door lock.
2. SPECIFICATIONS MODEL KOC-154K8S POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING MICROWAVE 1550W POWER GRILL 1550W CONSUMPTION CONVECTION 2550W COMBINATION 2950W MICROWAVE ENERGY OUTPUT 950W(IEC705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 582X379.1X518.2mm (22.9x14.9x20.4 in.) CAVITY DIMENSIONS (W X H X D) 390X285.5X383mm (15.4x11.2x15.1 in.) NET WEIGHT APPROX. 23.1kg (50.9 lbs.
2. FEATURE DIAGRAM 8. ROLLER GUIDE This must always be used for cooking together with the turntable tray. 1. DOOR HOOK When the door is closed, it will automatically lock shut. If door is opened while oven is operating, the magnetron will immediately stop operating. 9. METAL TURNTABLE TRAY This is to be used for convection, combination and grill cooking. It rotates during cooking. 2. DOOR VIEWING SCREEN Allows viewing of food. The screen is designed so that light can pass through, but not the microwave.
4. 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 and, eventually, cause failure. 3. Away from Radio and TV sets Poor television reception and radio interference may result if the oven is located close to a TV, Radio, antenna or feeder and so on.
5. CONTROL PANEL DISPLAY WINDOW 1. MICROWAVE - indicator, showing microwaving in progress. 2. DEFROST - indicator, showing defrosting in progress. 3. GRILL(upper grill heater) - indicator, showing griling in progress. ① ② ③ ④ % ⑦ ⑥ ⑤ ⑧ 4. GRILL(lower grill heater) - indicator, showing griling in progress. 5. CONVECTION - indicator, showing convectioning in progress. ⑨ ⑩ ⑪ ⑫ ⑬ ⑭ 7. % - percentage microwave power level indicator. ⑮ ⑯ 8. BARBECUE - indicator ⑰ ⑱ 6. CHILD LOCK - indicator.
6. 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 danger from a short circuit. You are asked to observe the following precautions carefully. 1. Always remove the power plug from the outlet before servicing. 2.
1. To remove cabinet 1) Remove 5 screws on the cabinet back and side. 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 assembly, perform a check of correct alignment with the hinge and cavity front plate.
3. To remove door parts. A01 A09 A02 A03 A08 A04 A07 NO PARTS CODE PARTS NAME DESCRIPTION A01 3512210300 FRAME DOOR PC A10 A06 A05 Q'TY 1 A02 3515204900 STOPPER HINGE *T AS KOC-1B0K0S 1 A03 3511714110 DOOR SEAL AS KOC-154K8S 1 A04 3512302800 GASKET DOOR PBT 1 A05 3513101800 HOOK POM 1 A06 3515101800 SPRING HOOK PW1 1 A07 3517008920 BARRIER-SCREEN *O GLASS T3.
(1) Remove the gasket door from door plate. (2) Remove two screws from the handle assembly secured to door frame. (3) Remove the handle door and barrier screen outer from door frame. (4) Remove the door frame from door plate. (5) Remove the stopper hinge top from door plate. (6) Remove the spring and the hook. (7) Reverse the above steps for reassembly. 4. Method to reduce the gap between the door seal and the oven front surface. (1) To reduce gap located on part ‘A’.
5. To remove control panel parts. NO PARTS CODE PARTS NAME DESCRIPTION Q'TY B01 3511617330 DECORATOR C-PANEL KOC-154K8SA2 1 B02 3511617300 DECORATOR C-PANEL STS T0.
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) Remove a screw which secure the magnetron. (2) Remove the magnetron. (3) Reverse the above steps for reassembly.
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 shaded pole. (7) Remove the motor shaded pole. (8) Reverse the above steps for reassembly. 9. To remove H.V.transformer. (1) Remove four screws holding the H.V transformer. (2) Remove the H.V.transformer.
10. To remove Guide air assembly parts. NO PARTS CODE PARTS NAME DESCRIPTION G01 3512525200 GUIDE AIR PBT G02 3513601600 LAMP BL 240V 25W T25 C7A H187 1 G03 3515102700 SPRING TERMINAL SUS301 T0.5 2 G04 3966310100 MOTOR SYNCRO 220V 2.5W GM-16-24FD12 1 G05 3510609100 BRACKET DAMPER SBHG T0.
11. To remove Top heater assembly parts. REF NO. PART CODE PART NAME DESCRIPTION Q’TY D01 7112401011 SCREW TAPPING T1 TRS 4X10 2 D02 3512523600 GUIDE AIR OUTLET SBHG T0.5 1 D03 3513304000 INSULATOR HEATER *T SECC TO.5 1 D04 3511407600 COVER HEATER *T STS430 T0.4 1 D05 3512806010 REFLECTOR HEATER *T SUS 1 D06 3512803800 HEATER MIRACLON 115V 550W 270MM 2 D07 3510607700 BRACKET HEATER *T SA1D-80 T0.
12. To remove Rear heater assembly parts. REF NO.
13. To remove Motor synchro. And Under heater assembly parts. E04 E01 E03 E02 E05 CUTTING (6EA) REF NO. PART CODE PART NAME DESCRIPTION E01 3512802000 HEATER *U 230V 400W R18374001 1 E02 3511407500 COVER HEATER *U STS430 T0.5 1 E03 3515304000 SUPPORTER HEATER *U STS430 T0.5 1 E04 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI 1 E05 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI 1 1) Cut the Motor syncro. Cover parts from the base plate.
7. 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 switch When the door is closed, the hook locks the oven door. If the door is not closed properly, the oven will not operate. When the door is closed, the hook pushes the lock lever downward.
8. 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. 4) When checking the continuity of the switches, fuse or high voltage tranformer, disconnect one load wire from these parts and check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.
CONDITION CHECK RESULT CAUSE REMEDY Outlet has proper voltage fuse does not blow? Check continuity of magnetron No continuity Defective magnetron. Replace Check continuity of noise filter board No continuity Defective line filter board Replace Check continuity of power supply cord No continuity Open power supply cord Replace No continuity Defective touch control circuit Replace NOTE : All these switches must be replaced at the same time, please refer to (7.
TROUBLE 3) No microwave oscillation even though fan motor rotates.
(TROUBLE 4) Grill heater (upper heater) is not heated; food will not become hot. CONDITION Grill heater is not heated. CHECK RESULT CAUSE REMEDY Check continuity of primary interlock switch No continuity Malfunction of primary Interlock switch Adjust or replace Check continuity of secondary interlock switch No continuity Malfunction of secondary interlock switch Adjust or replace Check continuity of heater No continuity Defective heater Check D.
(TROUBLE 6) Lower heater is not heated; food will not become hot. CONDITION CHECK RESULT CAUSE REMEDY Lower heater Is not heated Check continuity of Primary interlock switch No continuity Malfunction of primary Interlock switch Adjust or Replace Check continuity of secondary interlock switch No continuity Malfunction of secondary interlock switch Adjust or replace Check continuity of heater No continuity Defective heater Check D.
(TROUBLE 8) When “ERROR 2 ERROR 3” come on display.
9. MEASUREMENT AND TEST 9-1. 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 oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1000 ± 5cc of potable water. 2.
9-2. MICROWAVE RADIATION TEST WARNING 1. Make sure to check the microwave leakage before and after repair of adjustment. 2. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy. 3. Do not place your hands into any suspected microwave radiation field unless the safe density level is known. 4. Care should be taken not to place the eyes in direct line with the source of microwave energy. 5.
9-3. 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 from its power source and discharge the capacitor. 1. High voltage transformer 1) Remove connections from the transformer terminals and check continuity.
9-4.
10.
11. EXPLODED VIEW AND PARTS LIST TOTAL ASSEMBLY * From A00 to G00 and P00, refer to 6. Disassembly and assembly.
NO A00 B00 C00 D00 E00 F00 G00 P00 H01 H02 H03 H04 H05 H06 H07 H08 H09 H10 H11 H12 H13 H14 H15 H16 H17 H18 H19 H20 H21 H22 H23 H24 H25 H26 H27 H28 H29 H30 H31 H32 H33 H34 H35 H36 H37 H38 H39 H40 H41 H42 H43 H44 H45 H46 H47 H48 H49 H50 H51 H52 H53 H54 PARTS CODE 3511724960 PKCPSWF240 3512804140 3512804030 3512803900 3511408520 3512525310 3512513400 3516117720 3512523600 3513304000 7121400611 3518904400 3510808620 7112401011 7112401012 35113A5QJ5 7S432X4081 7122401211 7121300811 3518903400 3518003700 3516004
12. PRINTED CIRCUIT BOARD CIRCUIT CHECK PROCEDURE 1. Low voltage transformer check The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage: 220~240V / Frequency: 50Hz Terminal Voltage(load) Voltage(no load) 6-7 AC 17.0 V AC 19.9 V 8-9 AC 1.3 V AC 1.6 V 9-10 AC 1.3 V AC 1.6 V 3 NOTE 1. Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage. 2.
3. Case of no microwave oscillation 1) When touching M/W button, oven lamp turns on and Fan motor and turntable rotate, and cook indicator in display comes on. *Cause: RELAY 1 does not operate. D8 2 Q15 - Check method STATE POINT A POINT B RELAY 1 ON +5V DC GND RELAY 1 OFF GND +24V DC 2) When touching M/W button, oven lamp does not turn on and turntable motor does not rotate but cook indicator in display comes on. *Cause: RELAY 6 does not operate.
4. Case of no heating of upper grill When touching GRILL1 & COMBI button, oven lamp turns on and Fan motor and turntable motor rotate and cook indicator in the display comes on. *Cause: RELAY 4 does not operate. 48 D11 Q5 RY4 STATE POINT A POINT B RELAY 4 ON +5V DC GND RELAY 4 OFF GND +24V DC 5. Case of no heating of lower grill When touching GRILL2 & COMBI button, oven lamp turns on and Fan motor and turntable motor rotate and cook indicator in display comes on.
7. Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop. - Check method POINT A B DOOR OPEN OPEN +5V DC DOOR CLOSED CLOSE GND STATE CHECK NO 1 METHOD Check the stage(ON,OFF) of the door open monitor switch by resistance measurement. 35 REMEDY Replace door open monitor swith.
13. P.C.B.
NO 1 NAME BUZZER LOCATION BZ1 PART CODE 3515600100 SPECIFICATION Q'TY REMARK BM-20K 1 2 C CERA C1~4,7~13 CCZF1H104Z 50V HIKF 0.1uF Z 11 3 C CERA C5,6 CCZB1H102K 50V B 1000pF K 2 4 C ELECTRO EC1 CEXE1H100A 50V RS 10uF (5X11) TP 1 5 C ELECTRO EC2,EC3 CEXF1V221V 35V RSS 220uF (10X12.5) TP 2 6 C ELECTRO EC4 CEXF1V102V 35V RSS 1000uF (13X25) TP 1 7 C ELECTRO EC5 CEXF1H101V 50V RSS 100uF (8X11.
NO NAME LOCATION PART CODE SPECIFICATION Q'TY REMARK 42 SW RELAY RY1,2 5SC0101122 G5G-1A 1C 1P DC24V 2 43 SW RELAY RY3~5 5SC0101124 G5G-1A-DT 1C 1P DC24V 3 44 SW RELAY RY6~9 5SC0101129 CS11-24SH 1C 1P 4 45 TR Q5~8,10~14,17 TZRC106M-- KRC-106M (AUTO) 10 46 TR Q1,4 TZTA1266Y- KTA-1266Y (AUTO) (1015Y) 2 47 TR Q2,3,9,16 TZTC3198GR KTC-3198GR (AUTO) (1815GR) 4 48 TR Q15 TZTC1027Y- KTC-1027Y 1 49 TRANS POWER LVT 5EPV041410 DMR-210FS 1 50 WIRE COPPER J10,11,1
DAEWOO ELECTRONICS CORP. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” S/M NO. : PRINTED DATE: Feb.
