S/M No. : G867T9A001 Service Manual KOC-1B0K Microwave Oven, Convection & Grill MAY.
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 POWER SUPPLY 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) 560(22.0)X543(21.3)X344(13.5)mm (inch) CAVITY DIMENSIONS (WXHXD) 368.5(14.5)X376.5(14.8)X246(9.7)mm (inch) 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. 2. Leave space behind and side. All air vents should be kept a clearance. If all vents are covered during operation, the oven may be overheated and, eventually, cause oven 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. 4.
5. CONTROL PANEL - KUC-1B0K 1 2 3 4 % Clock 0 Less More Co mb i W M/ e nv 9. language : Press to select the language. 10. clock : Use to set clock. 11. less : Use to remove time from cooking. 12. more : Use to add time to cooking. 13. m/w : Press to select microwave power level. 14. combi : Press to select combi cooking mode. 15. auto defrost : Press to select defrost menu. 16. convection : Press to select convection temperature. 17. grill : Press to select grill. 18.
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 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 assemby. NOTE: After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate.
3. To remove door parts. - KUC-1B0K A04 A02 A09 A03 A05 A06 A07 A10 A08 A01 REF NO. PART CODE PART NAME DESCRIPTION A01 3512204700 FRAME DOOR PC 1 A02 3517006900 BARRIER-SCREEN*O TEMP GLASS T3.
1) Remove the gasket door(A09) from door seal as(A01). 2) Remove the door frame (A04) from door seal as(A01). 3) Remove the stopper hinge top(A08) from door seal as(A01). 4) Remove the spring(A03) and the hook(A02). 5) Remove the barrier screen outer(A07) from door frame(A04). 6) Remove two screws(A06) from door seal as(A01). 7) Remove the door handle (A05) from door seal as(A01). 8) Reverse the above steps for reassembly. 4. Method to reduce the gap between the door seal and the oven front surface.
5. To remove control panel parts. - KUC-1B0K 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 7112401011 3512520500 3513302800 7112401011 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 7112401011 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.
10.
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.
NO A00 B00 PART CODE 3511714000 3511714070 PKCPSWLG40 PKCPSWAD40 PART NAME DOOR AS CONTROL-PANEL AS STOPPER HINGE *U AS DESCRIPTION KOC-1B0K0S KOC-1B4K9A KOC-1B0K9A27 KOC-1B4K9A KOR-121M0A Q'TY 1 1 F01 3515202800 F02 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 1 F03 3510313500 BASE SBHG T0.
NO PART CODE PART NAME DESCRIPTION Q'TY F41 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI 4 F42 3963513010 MOTOR SHADED POLE 120V 60HZ MW10XA-T03 1 F43 3511800900 FAN PBT 1 F44 7402704600 RING C CR-5 SK5 1 F45 3512803800 HEATER MIRACLON 60V 550W 270MM 2 F46 3512766900 HARNESS CONVEC *B KOC-1B0K0S 1 F47 3511407400 COVER *B SA1D-80 T0.5 1 F48 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 F49 3511407300 COVER MOTOR *B SA1D-80 T0.
12. PRINTED CIRCUIT BOARD (KOC-1B0K9A27) 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(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 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. - 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 4 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 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 motor 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 - 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. 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
12. PRINTED CIRCUIT BOARD (KOC-1B4K9A27) 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. 46 REMEDY Replace door open monitor swith.
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
