Service Manual KOC-1B5K Microwave Oven, Convection & Grill SEP.
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. PROPER USE AND SERVICE PRECAUTIONS CAUTION This device is to be Serviced only by Properly Qualified Service Personel. Consult the Service Manual for Proper Service Procedures to Assure Continued Safety Operation and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy. 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.
2. SPECIFICATIONS KOC-1B0K9A27,1B4K9A27 MODEL POWER SUPPLY KOC-1B5K9A27 120V AC 60Hz, SINGLE PHASE WITH GROUNDING MICROWAVE POWER CONSUMPTION 1500W OUT POWER 1000W FREQUENCY 2450 MHz GRILL POWER CONSUMPTION 1600W CONVECTION POWER CONSUMPTION 1600W COMBINATION HEATING POWER CONSUMPTION 1600W OUTSIDE DIMENSIONS (WXHXD) CAVITY DIMENSIONS (WXHXD) 560X543X344mm 560X537.5X344mm (22.0X21.3X13.5inch) (22.0X21.2X13.5inch) 368.5X376.5X246mm 14.5X14.8X9.7inch NET WEIGHT Approx. 20.5kg(45.2 lbs.
2. FEATURE DIAGRAM 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 lock shut. If door is opened while oven is operating, the magnetron will immediately stop operating. 3. DOOR VIEWING SCREEN Allows viewing of food. The screen is designed so that light can pass through, but not the microwave. 4. TOP HEATER Turns on when convection, grill and combi cooking is selected. 5.
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 - KOC-1B5K 1 2 3 4 % 7 6 5 8 9 0 q w e a p s o d f i r t y u g DISPLAY WINDOW (INDICATOR) 1. MICROWAVE indicator: show microwave cook in progress. 2. DEFROST indicator: show defrost cook in progress. 3. GRILL(upper grill heater) indicator: show grill cook in progress. 4. GRILL(lower grill heater) indicator: show grill cook in progress. 5. CONVECTION indicator: show convection cook in progress. 6. CHILD LOCK indicator. 7. % percentage microwave power level 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 four screws on cabinet back. 2) Push the cabinet backward. 2. To remove guide wind 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 assemby. NOTE: After replacting the door assembly, perform a check of correct alignment with the hinge and cavity front plate.
3. To remove door parts. - KOC-1B5K REF NO. PART CODE PART NAME DESCRIPTION A01 3512603550 HANDLE DOOR ABS SG-0760D, SG-175 1 A02 3515307410 SUPPORTER HANDLE ABS SG-0760D, SG-175 2 A03 3512204760 FRAME DOOR ABS XR-401, SR-0320 1 A04 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 2 A05 3517001100 BARRIER SCREEN *O SEALING AS KOC-1B5K9S 1 A06 3515204900 STOPPER HINGE *T AS KOC-1B4K0S 1 A07 3516602100 DOOR-PLATE SBHG-1A T0.
(1) Remove the gasket door(A10) from door plate. (2) Remove door plate(A07) from door frame. (3) Remove two screws (A11) from door frame. (4) Remove the door handle (A01) and handle supporter (A02) from door frame. (5) Remove two screws (A04) from door frame. (6) Remove barrier screen *O sealing AS (A05) from door frame. (7) Remove the stopper hinge top(A06) from door plate. (8) Remove the spring(A09) and the hook(A08). (9) Reverse the above steps for reassembly. 4.
5 To remove control panel parts. -KOC-1B5K REF NO.
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 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 reasembly. 9. To remove H.V.transformer. 1) Remove four screws holding the H.V.transformer. 2) Remove the H.V.transformer. 3) Reverse the above steps for reassembly.
10. To remove Top heater assembly parts. REF NO. 1 2 3 4 5 6 7 8 PART CODE 7S312X40A1 3512520500 3513302800 7S312X40A1 3512767000 3510607700 3512803820 3511407600 PART NAME SCREW TAPPING GUIDE AIR OUTLET INSULATOR HEATER *T SCREW TAPPING HARNESS HEATER BRACKET HEATER *T HEATER MIRACLON COVER HEATER *T DESCRIPTION T1 TRS 4*10 MFZN SA1D-80 T0.5 SECC T0.5 T1 TRS 4*10 MFZN KOC-1B0K0S SA1D-80 T0.5 60V 550W STS430 T0.5 1) Remove a screw which secure the wind guide assembly. 2) Pull out Guide air outlet .
11. To remove Lamp assembly parts. REF NO. 1 2 3 4 5 PART CODE 3511407800 3513602600 3513003910 7112401011 3511407810 PART NAME COVER LAMP LAMP HOLDER LAMP AS SCREW TAPPING COVER LAMP DESCRIPTION STS430 T0.5 HALOGEN 120V 20W KOC-1B0K5A T1 TRS 4*10 MFZN T/GLASS T2.0 1) Pull out the Lamp assembly. 2) Remove a screw which secures Holer Lamp Assembly. 3) Pull out Lamp and Holder lamp as from Cover lamp . 4) Detach Lamp from Holder lamp as . 5) Pull out Cover lamp from Cover lamp .
12. To remove Rear heater assembly parts. REF NO.
13. To remove Motor Synchro and Under heater assembly parts. 5 4 3 2 1 CUTTING (6EA) REF NO. 1 2 3 4 5 PART CODE 7S312X40A1 3511407500 3515304000 3512805100 7113400814 PART NAME SCREW TAPPING COVER HEATER *U SUPPORTER HEATER *U HEATER *U SCREW TAPPING DESCRIPTION T1 TRS 4*10 MFZN STS430 T0.5 STS430 T0.5 120V 400W 1SOPE4543002 T1 BIN 4X8 MFNI 1) Cut the Motor syncro cover parts from the base plate. 2) Remove a screw and pull out Motor syncro. 3) Remove a screw which secures Under heater assembly.
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 button of the microswitch.
8. TROUBLE SHOOTING 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 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 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. A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of 3mm, an external diameter of approximately 190mm and a height of approximately 90mm. The mass of the container is determined. 2.
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.
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. 2) Normal readings should be as follows : Secondary winding .
4.
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11. EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY Refer to 6. Disassembly and assembly. 2. CONTROL PANEL ASSEMBLY Refer to 6. Disassembly and assembly. 3.
✔ 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).
✔ 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).
12. PRINTED CIRCUIT BOARD (KOC-1B5K) 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 Terminal Voltage(olad) 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 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. 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 does not rotate but cook indicator in display comes on. *Cause: RELAY 1 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 rotate, and cook indicator in display comes on. *Cause: RELAY 2 does not operate. STATE POINT A POINT B RELAY 2 ON +5V DC GND RELAY 2 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 rotate and cook indicator in display comes on. *Cause: RELAY 7 does not operate.
7. Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop. B A 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. 36 REMEDY Replace door open monitor swith.
B A 13. P.C.B.
PCB ASS’Y PART LIST NO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 NAME PCB MAIN PCB SUB BUZZER CAPACITOR CERAMIC CAPACITOR CERAMIC CAPACITOR ELECTRO CAPACITOR ELECTRO CAPACITOR ELECTRO CAPACITOR ELECTRO CAPACITOR ELECTRO CONNECTOR FILM CONNECTOR WAFER CONNECTOR WAFER CONNECTOR WAFER DIODE SWITCHING DIODE RECTIFYING DIODE ZENER DIODE ZENER DIODE ZENER DIODE ZENER DIODE ZENER DIGITRON HOLDER VFD IC MICO
13. P.C.B.
PCB ASS’Y PART LIST NO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 NAME PCB MAIN PCB SUB BUZZER CAPACITOR CERAMIC CAPACITOR CERAMIC CAPACITOR ELECTRO CAPACITOR ELECTRO CAPACITOR ELECTRO CAPACITOR ELECTRO CAPACITOR ELECTRO CONNECTOR FILM CONNECTOR WAFER CONNECTOR WAFER CONNECTOR WAFER DIODE SWITCHING DIODE RECTIFYING DIODE ZENER DIODE ZENER DIODE ZENER DIODE ZENER DIODE ZENER DIGITRON HOLDER VFD IC MICOM RESISTOR RESISTOR RESISTOR RESI
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: Sep.
