Daewoo KOC-9N7T7S Service Manual Download

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Model : KOC-9N7T7S

S/M No : C9N7T7S001

JAN . 2005

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.

Microwave Oven

Summary of Contents for KOC-9N7T7S

Page 1: ...05 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 Microwave Oven ...

Page 2: ... for proper alignment integrity and connections d Any defective or misadjusted components in the interlock monitor door seal and microwave generation and transmission systems shall be repaired replaced or adjusted by procedures described in this manual before the oven is released to the owner TABLE OF CONTENTS 1 SAFETY AND PRECAUTIONS 2 2 SPECIFICATIONS 3 3 EXTERNAL VIEW 4 3 1 OUTER DIMENSION 4 3 ...

Page 3: ...certified oven unit is found to servicing a microwave emission check should be performed prior to servicing the oven 1 inform the manufacturer importer or assembler 2 repair the unit at no cost to the owner 3 attempt to ascertain the cause of the excessive leakage 4 tell the owner of the unit not to use the unit until the oven has been brought into compliance 3 If the oven operates with the door o...

Page 4: ...C 705 MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS W X H X D 542X329X514 1mm 21 3X13 0X20 2 in CAVITY DIMENSIONS W X H X D 350X230X355mm 13 8X9 1X14 0 in NET WEIGHT Approx 18Kg 39 6 lbs TIMER 60 minutes FUNCTION SELECTIONS Microwave Grill Convection Combination POWER SELECTIONS 10 LEVELS CAVITY VOLUME 1 0 Cu Ft SPECIFICATION ARE SUBJECT TO CHANGE WITHOUT NOTICE 2 SPECIFICATIONS ...

Page 5: ...4 3 EXTERNAL VIEW 542 329 514 1 1 OUTER DIMENSION ...

Page 6: ...matically turns on during oven operating 16 SAFETY INTERLOCK SYSTEM 17 CONTROL PANEL 18 TURNTABLE TRAY Rotates during cooking and ensure even distribution of Microwaves It can also be used as a cooking utensil 19 ROLLER GUIDE This must always be used for cooking together with the turntable tray 10 COUPLER This fits over the shaft in the center of the ovens cavity floor This is to remain in the ove...

Page 7: ... 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 If any of the above are visible DO NOT INSTALL and notify dealer immediately 7 Do not operate the oven if it...

Page 8: ... Con vection When blinking the oven is operating in CONVECTION g When blinking the oven is operating in weight input mode 2 2 Auto cook Used to cook or reheat 3 3 Combi Used to select combi 4 4 Weight Defrost Used to defrost foods 5 5 Grill Used to select grill 6 6 MW Used to set power level of micro wave 7 7 Time Defrost Used to defrost foods 8 8 Convection Used to select convection and selected ...

Page 9: ...nning repair work 2 Warning about the electric charge in the high voltage capacitor For about 30 seconds after the operation has stopped electric charge remains in the high voltage capacitor When replacing or checking parts short between oven chassis and the negative high terminal of the high voltage capacitor by using a properly insulated screwdriver to discharge 4 When the fuse is blown out due ...

Page 10: ...rd 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 9 ...

Page 11: ...LE DOOR ABS SG 0760D SG 175 1 3 To remove door parts 1 Remove the gasket door from door plate 2 Remove the door frame from door plate 3 Remove screws from door frame 4 Remove the handle from door frame 5 Remove the decorator door from door frame 6 Remove the stopper hinge top from door plate 7 Remove the spring and the hook 8 Remove barrier screen outer from door frame 9 Reverse the above steps fo...

Page 12: ...inge top and then push the door to contact the door seal to oven front surface Tighten two screws 2 To reduce gap located on part B Loosen two screws on stopper hinge under and then push the door to contact the door seal to oven front surface Tighten two screws NOTE A small gap may be acceptable if the microwave leakage does not exceed 4mW cm2 ...

Page 13: ... SPRAY 1 1 Remove the screw which secure the control panel push up two snap fits and draw forward the control panel assembly 2 Remove four screws B07 which secure the PCB Main ASS Y 3 Pull out the Main PCB assembly B08 4 Remove four screws B09 which secure the PCB Sub ASS Y 5 Pull out the Sub PCB assembly B10 6 Pull out the Knob volume B01 from the Sub PCB assembly 7 Pull out ten buttons from the ...

Page 14: ...r normally closed Magnetron antenna MAGNETRON Metallic gasket plate Cooling fin Filament terminal 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 secu...

Page 15: ... 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 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 ...

Page 16: ...RS 4X10 MFZN 1 2 3512520500 GUIDE AIR OUTLET SA1D T0 5 1 3 3512804900 HEATER REFLECTOR STS430 T0 5 1 4 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 2 5 3510607700 BRACKET HEATER T SA1D T0 5 2 6 3512805800 HEATER MIRACLON 230V 800W 270MM 1 7 3511410300 COVER HEATER T SA1D T0 5 1 Caution In this Service Manual some parts can be changed for improving their performance without notice in the parts list So...

Page 17: ...ING T1 TRS 4 10 MFZN 1 3 7112401011 SCREW TAPPING T1 TRS 4 10 MFZN 1 4 3511407900 COVER B SA1D 80 T0 5 1 5 3512767610 HARNESS CONVECTION KOC 924T0S ALTERNATE 1 6 7113400814 SCREW TAPPING T1 BIN 4 8 MFNI 4 8 3511409800 COVER HEATER B SA1D 80 T0 5 1 7 3513303400 INSULATOR HEATER B SBHG 1 T0 5 1 9 7113400814 SCREW TAPPING T1 BIN 4 8 MFNI 3 10 3511800700 FAN CONVECTION SA1D 80 T0 5 1 11 3513002300 HOL...

Page 18: ...osed the hook pushes the lock lever downward The lock lever presses the button of the interlock monitor switch to bring it under OFF condition and presses the button of the secondary interlock switch to bring it under ON condition 3 Adjustment steps a Loosen the one mounting screw b Adjust interlock switch assembly position c Make sure that lock lever moves smoothly after adjustment is completed d...

Page 19: ...f the terminals and power cord before check the parts listed below CONDITION CHECK Check continuity of interlock monitor switch with door closed COM NC Check continuity of both primary and secondary interlock switch with door closed Malfunction of Interlock monitor switch Malfunction of interlock switch RESULT Continuity No continuity CAUSE REMEDY Replace COM NC Fuse blows Replace Shorted contacts...

Page 20: ...st for adjustment instructions TROUBLE 2 Display shows all figures selected but oven does not start cooking even though desired program and time are set and start button is tapped CONDITION CHECK Check continuity of primary interlock switch Malfunction of primary interlock switch RESULT No continuity CAUSE REMEDY Adjust or replace Turn table motor and oven lamp do not turn on Check D C voltage bei...

Page 21: ... to magnetron terminal and magnetron body Continuity Defective magnetron 2 1 Check resistance of primary and secondary coil of high voltage transformer 0 or Defective high voltage transformer Replace Check continuity of high voltage fuse No microwave oscillation No continuity 2 Check continuity of magnetron heater with wires removed No continuity Defective magnetron Replace 1 Check continuity of f...

Page 22: ...eck continuity of heater Defective heater No continuity Replace TROUBLE 5 1 Convection heater is not heated food will not become hot 2 Convection fan motor does no rotate CONDITION CHECK Check continuity of primary interlock switch Malfunction of primary Interlock switch RESULT No continuity Adjust or replace 1 Convection heater is not heated 2 Convection fan and motor does not rotate Check D C vo...

Page 23: ...y does not count down or up with time cooking or clock operation 5 Oven is programmable and cooks normally but no display shows 6 Display obviously jumps in time while counting down 7 Display counts down noticeably too fast while cooking 8 Display does not show the time of day when clear button is touched 9 Oven lamp and turn table motor do not stop although cooking is finished Check if the RELAY ...

Page 24: ... the water temperature to attain 20 C 2 C is measured The oven is then switched off and the final water temperature is measured within 60s NOTE 1 The water stirred is before its temperature is measured NOTE 2 Stirring and measuring devices are to have a low heat capacity 4 The microwave power output is calculated from the formula where P is the microwave power output in watts mW is the mass of the...

Page 25: ...net door seem door viewing screen the exhaust air vents and the suction air vents 3 Measuring should be in a counter clockwise direction at a rate of 1 in sec If the leakage of the cabinet door seem is unknown move the probe more slowly 4 When measuring near a corner of the door keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 i...

Page 26: ... set on the highest resistance scale measure the resistance across the diode terminals Reverse the meter leads and again observe the resistance reading Meter with 6V 9V or higher voltage batteries should be used to check the front back resistance of the diode otherwise an infinite resistance may be read in both directions A normal diode s resistance will be infinite in one direction and several hu...

Page 27: ...26 4 COMPONENT ACTION COOKING MODE MAGNE UPPER REAR CONVEC TRON ELEMENT ELEMENT TION FAN M W GRILL COMBI CONVECTION ROAST PORK ROAST BEEF ROAST CHICKEN BAKED FISH FRESH VEGETABLES MANUAL MODE AUTO MODE ...

Page 28: ...27 10 WIRING DIAGRAM ...

Page 29: ...28 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 TOTAL ASSEMBLY ...

Page 30: ...UIDE AIR OUTLET SA1D 80 T0 5 1 F13 3512804900 HEATER REFLECTOR STS430 T0 5 1 F14 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI 2 F15 7112401011 SCREW TAPPING T1 TRS 4 10 MFZN 1 F16 3510607700 BRACKET HEATER T SA1D 80 T0 5 1 F17 7121400611 SCREW TAPPING T1 PAN 4 6 MFZN 1 F18 3518903000 THERMOSTAT OFF 140 ON 125 H 187 1 F19 7112401011 SCREW TAPPING T1 TRS 4 10 MFZN 2 F20 35113V5QJ5 CORD POWER AS 3X1 5 80...

Page 31: ...T0S 1 F51 4415A17352 SW MICRO VP 533A OF SPNO 187 200G 1 F52 3513816000 LOCK PP 1 F53 3513700800 LEVER LOCK POM 1 F54 4415A66910 SW MICRO VP 531A OF SZM V16 FA 61 2 F55 3518571000 SWITCH PUSH MP101C 1 F56 7S422X4081 SCREW SPECIAL TT3 TRS 4X8 SE MFZN 1 F57 3513003200 HOLDER HV CAPACITOR SECC T0 6 1 F58 3518400400 DIODE HV HVR 1X 3AB 12KV 187 1 F59 3518302301 CAPACITOR HV 2100VAC 1 10UF 187 80MM 1 F...

Page 32: ... fluctuation of power source voltage 2 The allowable tolerance of the secondary voltage is within 5 of nominal voltage NOTE Each measure point must be measured with GND points Terminal 6 7 8 9 9 10 Voltage load AC 17 0 V AC 1 3 V AC 1 3 V Voltage no load AC 19 9 V AC 1 6 V AC 1 6 V NO CHECK POINT REMARK 1 IC1 PIN 26 27 5VDC 5 2 IC1 PIN 28 3 IC1 PIN 8 OR 9 T 20 ms 50Hz 5V 0V T T 250 ns 4MHz 5V 0V T...

Page 33: ...32 MEASUREPOINT MP1 GND MP2 ...

Page 34: ... indicator in display comes on Cause RELAY 4 does not operate 3 When touching M W button oven lamp turn on and turns on and fan motor does not rotate but cook indicator in display comes on Cause RELAY 5 does not operate STATE RELAY 1 ON RELAY 1 OFF POINT A 5V DC GND POINT B GND 24V DC M W D8 Q5 B A RY1 16 STATE RELAY 4 ON RELAY 4 OFF POINT A 5V DC GND POINT B GND 24V DC LAMP TRAY D14 Q8 B A RY4 23...

Page 35: ...perate 5 Case of no heating of convection grill When touching CONVECTION button oven lamp turns on and Fan motor and turntable rotate and cook indicator in display comes on Cause RELAY 3 does not operate STATE RELAY 2 ON RELAY 2 OFF POINT A 5V DC GND POINT B GND 24V DC TOP GRILL D9 Q6 B A RY2 32 STATE RELAY 3 ON RELAY 3 OFF POINT A 5V DC GND POINT B GND 24V DC CONV GRILL D13 Q7 B A RY3 33 ...

Page 36: ...peration the count down timer does not stop POINT STATE DOOR OPEN DOOR CLOSED A OPEN CLOSE B 5V DC GND CN1 1 2 D6 R17 5V R6 C9 15 R4 A B D O M SW CHECK NO METHOD REMEDY Check the stage ON OFF of the door open 1 monitor switch by resistance Replace door open monitor swith measurement ...

Page 37: ...36 13 P C B CIRCUIT DIAGRAM ...

Page 38: ...6 TP 1 23 EC4 CEXF1H221V C ELECTRO 50V RSS 220MF 10X16 TP 1 24 Q01 TZRC106M TR KRC106M AUTO 1 25 Q02 TZTA1266Y TR KTA1266Y AUTO 1015Y 1 26 Q04 TZTC3198GR TR KTC3198GR 1815GR 1 27 Q05 TZRC106M TR KRC106M AUTO 1 28 Q06 TZRC106M TR KRC106M AUTO 1 29 Q07 TZRC106M TR KRC106M AUTO 1 30 Q08 TZRC106M TR KRC106M AUTO 1 31 Q09 TZRC106M TR KRC106M AUTO 1 32 Q10 TZRC106M TR KRC106M AUTO 1 33 RA1 RA 88X104J R ...

Page 39: ...01052GY WIRE COPPER 1 0 52 TIN COATING 1 76 J09 85801052GY WIRE COPPER 1 0 52 TIN COATING 1 77 J10 85801052GY WIRE COPPER 1 0 52 TIN COATING 1 78 J11 85801052GY WIRE COPPER 1 0 52 TIN COATING 1 79 J12 85801052GY WIRE COPPER 1 0 52 TIN COATING 1 80 J13 85801052GY WIRE COPPER 1 0 52 TIN COATING 1 81 J14 85801052GY WIRE COPPER 1 0 52 TIN COATING 1 82 J15 85801052GY WIRE COPPER 1 0 52 TIN COATING 1 83...

Page 40: ...RD 2Z201JS R CARBON FILM 1 2 200 OHM J SMALL 1 124 R27 RD 2Z201JS R CARBON FILM 1 2 200 OHM J SMALL 1 125 R28 RD 2Z201JS R CARBON FILM 1 2 200 OHM J SMALL 1 126 R29 RD 2Z201JS R CARBON FILM 1 2 200 OHM J SMALL 1 127 R30 RD AZ102J R CARBON FILM 1 6 1K OHM J 1 128 R31 RD 2Z270JS R CARBON FILM 1 2 27 OHM J SMALL 1 129 ZD1 DZUZ3R3BSB DIODE ZENER UZ 3 3BSB 3 32 3 53V 1 130 ZD2 DZUZ3R9BSB DIODE ZENER UZ...

Page 41: ...686 AHYE ON DONG MAPO GU S E OUL KOR E A C P O BOX 8003 S E OUL KOR E A PRINTED DATE JAN 2005 DAEWOO ELECTRONICS CORP ...

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