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PRINTED CIRCUIT BOARD

2. P.C.B. CIRCUIT DIAGRAM

Содержание KOG-370A0S

Страница 1: ...Service Manual Microwave Oven Model KOG 370A0S KOG 390A0S KOG 390A0N DAEWOO ELECTRONICS CO LTD S M No G370A0S002 ...

Страница 2: ...ating the magnetron or other microwave source and make repairs as necessary 1 Interlock operation 2 Proper door closing 3 Seal and sealing surfaces arcing wear and other damage 4 Damage to or loosening of hinges and latches 5 Evidence of dropping or abuse c Before turning on power to the microwave oven for any service test or inspection within the microwave generating compartments check the magnet...

Страница 3: ...certified oven unit is found to servicing a microwave emission check should be performed prior to servicing the oven a inform the manufacturer importer or assembler b repair the unit at no cost to the owner c attempt to ascertain the cause of the excessive leakage d 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...

Страница 4: ... 4 x 8 7 x 12 0 in 320 x 244 x 338mm 12 6 x 9 6 x 13 3 in NET WEIGHT APPROX 13 7Kg 30 2lbs APPROX 15 8Kg 34 9lbs TIMER 59 min 90 sec FUNCTION SELECTIONS MICROWAVE POWER SELECTIONS 10 LEVELS CAVITY VOLUM E 0 7 Cu Ft 0 9 Cu Ft MODEL KOG 390A0N POWER SUPPLY 220V 50Hz SINGLE PHASE W ITH EARTHING POWER CONSUMPTION MICROWAVE 1250W GRILL 1050W COMBINATION 2250W MICROWAVE ENERGY OUTPUT 900W MICROWAVE FREQ...

Страница 5: ... EXTERNAL VIEW 1 OUTER DIMENSION 465 495 279 29 4 360 388 ...

Страница 6: ...er the shaft in the center of the ovens cavity floor This is to remain in the oven for all cooking 9 ROLLER GUIDE This must always be used for cooking together with the glass cooking tray 10 GLASS COOKING TRAY Made of special heat resistant glass Food in a proper receptacle is placed on this tray for cooking 11 DOOR VIEWING SCREEN Allows viewing of food The screen is designed so that light can pas...

Страница 7: ...er level 11 DEFROST Used to defrost foods for time 12 KITCHEN TIMER Used as a minute timer to delay the start of cooking or to set a holding time after cooking 13 CLOCK Used to set clock 14 STOP CLEAR Used to stop the oven operation or to delete the cooking data 15 START EASY COOK Used to start the oven and also used to set a reheat time M W DEF GRILL COMBI TIMER g Auto Cook 1 Bread 2 Soup 3 Baked...

Страница 8: ...le 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 is colder than room ...

Страница 9: ...the oven door is opened during the oven operation all information is retained 11 If the START pad is touched and the oven does not operate check the area between the door and door is closed securely The oven will not start cooking under the door is completely closed or the program has been reset 12 When using the GRILL or COMBI mode Do not open the door so often the temperature inside the oven dec...

Страница 10: ...repair work 2 Warning about the electric charge in the high voltage capacitor For about 30 seconds after the operation stopped and 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 15A fuse is blown out due to...

Страница 11: ...cabinet backward 2 To remove door assembly 1 Remove a screw 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 ...

Страница 12: ... POLYESTER T0 1 1 A07 3512300200 GASKET DOOR PP 1 A08 3513100700 HOOK POM 1 A09 3515101300 SPRING HOOK PW1 1 REF NO PART CODE PART NAME DESCRIPTION QTY REMARK A01 3512204110 FRAME DOOR ABS XR 401 H 2938 1 A02 3517003150 BARRIER SCREEN O ACRYL 1 A03 3515304410 SUPPORTER BARR S O PP 1 A04 3515204100 STOPPER HINGE T AS KOR 63150S 1 A05 3511705620 DOOR WELD AS KOR 81250S 1 A06 3517002900 BARRIER SCREE...

Страница 13: ...r from door frame 8 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 Loosen a screw on stopper hinge top and then push the door to contact the door seal to oven front surface Tighten a screw 2 To reduce gap located on part B Loosen two screws on stopper hinge under and then push the door to contact ...

Страница 14: ...R 401 H 2938 1 B06 441G430171 SPRING BUTTON SWP DIA0 7 1 B07 3516906910 BUTTON DOOR OPEN ABS XR 401 H 2938 1 REF NO PART CODE PART NAME DESCRIPTION QTY REMARK B01 3518521720 SW ITCH MEMBRANE KOG 390A0S 1 B02 3516720210 CONTROL PANEL ABS XR 401 H 2938 1 B03 PKMPMSBW 00 PCB MAIN AS KOG 390A0S 1 B04 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 4 B05 3513702710 LEVER DOOR OPEN ABS XR 401 H 2938 1 B06 44...

Страница 15: ...ly 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 NOTE Never ins...

Страница 16: ... 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 3 Reverse the above steps for reassembly ...

Страница 17: ...move the tray motor cover 5 Remove a screw which secure the tray motor 6 Remove the tray motor 7 Reverse the above steps for reassembly except for securing the tray motor cover with screw 11 To remove heater assembly 1 Remove the three nuts 2 Remove the insulator heater assembly 3 Reverse the above steps for reassembly DISASSEMBLY AND ASSEMBLY ...

Страница 18: ... SUS 1 C02 3515000600 SPACER INSULATOR I C3771BD 2 C03 3513301100 INSULATOR HEATER SPP T0 8 1 C04 3512803400 HEATER 230V 1000W 1R67994001 1 KOG 390A0S 3512803500 220V 1000W 1S0PE47503 KOG 390A0N C05 7002500613 SCREW MACHINE TRS 5X6 MFCR 1 C06 7002400413 SCREW MACHINE TRS 4X4 MFCR 2 DISASSEMBLY AND ASSEMBLY ...

Страница 19: ...k pushes the lock lever downward The lock lever presses the button of the interlock monitor switch to bring it under NO 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 Tighten comp...

Страница 20: ...ls and power cord before check the parts listed below CHECK RESULT CAUSE REMEDY Fuse blows Continuity No Continuity Continuity 0 infinite Ω or Approx 150 310 normal Replace NOTE 1 Replace NOTE 1 Replace Replace Check continuity of primary winding of low voltage transformer Malfunction of interlock monitor switch Defective low voltage transformer Check continuity of interlock monitor switch with do...

Страница 21: ... filter board No Continuity Defective line filter board Replace NOTE All these switches must be replaced at the same time please refer to Interlock Mechanism And Adjustment CONDITION CHECK RESULT CAUSE REMEDY Turn table motor and oven lamp do not turn on No Continuity Adjust or replace Adjust or replace Replace Replace Malfunction of primary interlock switch No Continuity 0 V Approx 15 VDC Check c...

Страница 22: ...elay coil REMEDY Replace Replace Replace Replace Replace Replace Replace Replace No m icrowave oscillation Check continuity of high voltage rectifier in forward and backward direction with DC megger Check continuity of high voltage capacitor terminals with wires rem oved Connect megger leads to magnetron terminal and magnetron body Check resistance of primary and secondary coil of high voltage tra...

Страница 23: ...ly jumps in time while counting down 9 Display counts down noticeably too fast while cooking 10 Display does not show the time of day when clear pad is touched 11 Oven lamp and turntable motor do not stop although cooking is finished Check if the RELAY 2 contacts close if they are close replace touch control circuit CONDITION CHECK RESULT CAUSE REMEDY Display does not show programming at all even ...

Страница 24: ...essel the load is immediately placed on the center of the shelf which is in the lowest normal position 4 Microwave power is switched on 5 Heating time should be exactly A seconds Refer to table as following Heating time is measured while the microwave generator is operating at full power The filament heat up time for magnetron is not included 6 The initial and final temperature of water is selecte...

Страница 25: ...he door cabinet 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 clo...

Страница 26: ...the ohmmeter 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 an...

Страница 27: ... WIRING DIAGRAM ...

Страница 28: ...K 1 IC1 PIN 2 21 30 34 5VDC 2 IC1 PIN 35 T 20ms 50Hz 3 IC1 PIN 31 OR 32 T 250 ns 4MHz NO MEASURE POINT WAVE FORM REMEDY REMARK 1 MP1 DC 5V 0 25V Replace VL1 EC1 NO LOAD 2 MP2 DC 12V 2 0V Replace EC2 D12 13 14 NO LOAD NOTE 1 Refer to Circuit Diagram point 4 2 Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage 3 The allowable tolerance ...

Страница 29: ... PRINTED CIRCUIT BOARD MP1 MP2 Measure Point ...

Страница 30: ...ircuit Diagram point 6 Check method 5 When the door is opened during operation the count down timer does not stop refer to Circuit Diagram Point 1 Check method 6 When the digital clock does not operate properly refer to Circuit Diagram Point 5 If clock does not keep exact time you must check resistor R15 16 zener diodeZD1 POINT STATE A B RELAY 2 ON 5VDC GND RELAY 2 OFF GND 12VDC POINT STATE A B RE...

Страница 31: ... PRINTED CIRCUIT BOARD 2 P C B CIRCUIT DIAGRAM ...

Страница 32: ...1 7P 6 1 8 100K J RA 87X104J 1 15 RESISTOR R1 R7 1 6W 330 5 RD AZ331J 7 16 RESISTOR R8 10 12 14 22 1 6W 1K 5 RD AZ102J 5 17 RESISTOR R11 20 21 1 6W 100K 5 RD AZ104J 3 18 RESISTOR R13 1 6W 100 5 RD AZ101J 1 19 RESISTOR R15 17 1 6W 10K 5 RD AZ103J 3 20 RESISTOR R18 1 6W 1M 5 RD AZ105J 1 21 RESISTOR R19 1 4W 51 5 RD 4Z510J 1 22 REGULATOR VL1 MC7905C 1MC7905C 1 23 TRANSISTOR Q1 5 8 11 KRA 102M TZRA102...

Страница 33: ... 1 15 RESISTOR R1 R7 1 6W 330 5 RD AZ331J 7 16 RESISTOR R8 10 12 14 22 1 6W 1K 5 RD AZ102J 5 17 RESISTOR R11 20 21 1 6W 100K 5 RD AZ104J 3 18 RESISTOR R13 1 6W 100 5 RD AZ101J 1 19 RESISTOR R15 17 1 6W 10K 5 RD AZ103J 3 20 RESISTOR R18 1 6W 1M 5 RD AZ105J 1 21 RESISTOR R19 1 4W 51 5 RD 4Z510J 1 22 REGULATOR VL1 MC7905C 1MC7905C 1 23 TRANSISTOR Q1 5 8 11 KRA 102M TZRA102M 9 24 TRANSISTOR Q6 KTA 127...

Страница 34: ... EXPLODED VIEW AND PARTS LIST 1 DOOR ASSEMBLY Refer to Disassembly and assembly 2 CONTROL PANEL ASSEMBLY Refer to Disassembly and assembly 3 TOTAL ASSEMBLY ...

Страница 35: ...CORD NYLON66 1 F12 7112401011 SCREW TAPPING T1 TRS 4 10 MFZN 1 F13 7122401211 SCREW TAPPING T2S TRS 4 12 MFZN 1 F14 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 1 F15 7S627W 50X1 NUT HEX NUT FLANGE M5X0 8P MFZN 1 F16 4414A25110 FUSE 250V 15A 65TS 1 4414A25100 FUSE 250V 15A MDA15 1 F17 3518606100 NOISE FILTER DWLF M13 1 F18 7121403011 SCREW TAPPING T2S PAN 4X30 MFZN 2 F19 3963513100 MOTOR SHADED POLE ...

Страница 36: ... F42 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 1 F43 3966310100 MOTOR SYNCRO 220V 2 5W GM 16 24FD12 1 3966310110 MOTOR SYNCRO 220V 2 5W M2LJ49ZT52 1 F44 3518905300 THERMOSTAT OFF 75 ON 65 H 187 NB 1 F45 3513003400 HOLDER THERMOSTAT PBT 1 F46 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 1 F47 4078502031 BUTTON LOCKING PP HONAM A353 2 F48 3511405100 COVER WAVE GUIDE MICA T0 35 1 F49 3517400620 COUPLER ...

Страница 37: ...ORD NYLON66 1 F12 7112401011 SCREW TAPPING T1 TRS 4 10 MFZN 1 F13 7122401211 SCREW TAPPING T2S TRS 4 12 MFZN 1 F14 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 1 F15 7S627W 50X1 NUT HEX NUT FLANGE M5X0 8P MFZN 1 F16 4414A25110 FUSE 250V 15A 65TS 1 4414A25100 FUSE 250V 15A MDA15 1 F17 3518606100 NOISE FILTER DWLF M13 1 F18 7121403011 SCREW TAPPING T2S PAN 4X30 MFZN 2 F19 3963513100 MOTOR SHADED POLE 2...

Страница 38: ...M 1 F41 3513601600 LAMP BL 240V 25W T25 C7A H187 1 F42 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 1 F43 3966310100 MOTOR SYNCRO 220V 2 5W GM 16 24FD12 1 3966310110 MOTOR SYNCRO 220V 2 5W M2LJ49ZT52 1 F44 3518905300 THERMOSTAT OFF 75 ON 65 H 187 NB 1 F45 3513003400 HOLDER THERMOSTAT PBT 1 F46 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 1 F47 4078502031 BUTTON LOCKING PP HONAM A353 2 F48 3511405100 COV...

Страница 39: ... 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 8179 8180 PRINTED DATE JUN 1999 ...

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