Daewoo KOC-624Q0S Service Manual Download Page 1

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Service Manual

Microwave Oven

Model: KOC-621Q0S

KOC-624Q0S

DAEWOO ELECTRONICS CO., LTD.

S/M No. :

C621Q0S002

http : //svc.dwe.co.kr

Feb. 2002

✔

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).

Summary of Contents for KOC-624Q0S

Page 1: ...M No C621Q0S002 http svc dwe co kr Feb 2002 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 ...

Page 2: ...justed 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 A microwave leakage check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the owner TABLE OF CONTENTS 1 SAFETY AND...

Page 3: ...y 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...

Page 4: ...800W IEC705 MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS W X H X D 470X285X356mm 18 5X11 2X14 0 in CAVITY DIMENSIONS W X H X D 295X167X300mm 11 6X6 6X11 8 in NET WEIGHT APPROX 15kg 33 1 lbs TIMER Oven 99 minutes M W 60 minutes Grill 30 minutes FUNCTION SELECTIONS MICROWAVE GRILL OVEN COMBINATION POWER SELECTIONS 10 LEVELS CAVITY VOLUME 0 6 Cu Ft Specifications are subject to change without notic...

Page 5: ...ot the microwave 13 TOP HEATER Turns on when convection grill and combi cooking is selected 14 OVEN LAMP Automatically turns on during oven operating 15 SAFETY INTERLOCK SYSTEM 16 CONTROL PANEL 17 UNDER HEATER 18 METAL RACK 19 TURNTABLE TRAY Rotates during cooking and ensure even distribution of Microwaves It can also be used as a cooking utensil 10 TRAY GUIDE This must always be used for cooking ...

Page 6: ...maged 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 temperature This may occur dur...

Page 7: ...ess to select weight time defrost mode 3 grill Press to select grill 4 combi Press to select combi cooking mode 5 temp Press to select temperature 6 10m Press to set time and weight 7 1m Press to set time and weight 8 10s Press to set time 9 clock Use to set clock 10 auto cook Press to select auto cook menu 11 stop clear Press once to stop a programme and twice to cancel a programme 12 start speed...

Page 8: ...ht time defrost mode 3 grill Press to select grill 4 combi Press to select combi cooking mode 5 temp Press to select temperature 6 10m Press to set time and weight 7 1m Press to set time and weight 8 10s Press to set time 9 clock Use to set clock 10 auto cook Press to select auto cook menu 11 stop clear Press once to stop a programme and twice to cancel a programme 12 start speedy cook Press to st...

Page 9: ...ng 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 15A fuse is blown out due...

Page 10: ...h the hinge and cavity front plate 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 ...

Page 11: ...A08 3515101700 SPRING HOOK PW1 1 1 Remove the gasket door A06 from door plate 2 Remove the door frame A01 from door plate A04 3 Remove the stopper hinge top A03 from door plate A04 4 Remove the spring A08 and the hook A07 5 Remove the barrier screen outer A02 from door frame A01 6 Reverse the above steps for reassembly Caution In this Service Manual some parts can be changed for improving their pe...

Page 12: ...511606700 DECORATOR DOOR R SUS430 1 A14 3515307800 SUPPORTER HANDLE KOR 164H0A 2 A15 3512603210 HANDEL DOOR KOC 624 X 1 1 Remove the gasket door A01 from door plate 2 Remove the door frame A08 from door plate 3 Remove two screws A09 from door plate 4 Remove the door handle A15 and handle supporter A14 from door plate 5 Remove the four door decorators A10 A13 from door frame 6 Remove the stopper hi...

Page 13: ...e 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 M W 1 Roast Beef 3 Roast Chicken 5 Vegetable Auto Cook M W Def Grill Temp g 2 Roast Pork 4 Fish Fillets Grill Combi Temp Clock Combi KOC 621Q Stop Clear Defrost 1000g 100g 10m 1m 10s Auto Cook Start Speedy cook A B NOTE A small gap may be accepta...

Page 14: ...SCREW TAPPING T1 TRS 4X12 MFZN 4 1 Remove four screws B04 which secure the PCB AS B03 2 Pull out the PCB AS B03 from control panel B02 3 Reverse the above steps for reassembly Caution In this Service 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 informatio...

Page 15: ...its and draw forward the control panel assembly 2 Remove four screws which secure the PCB assembly to control panel 3 Disconnect membrane tail from the connector of the PCB assembly 4 Detach membrane from the control panel 5 Pull out the decorator c panel from the control panel 6 Reverse the above steps for reassembly Caution In this Service Manual some parts can be changed for improving their per...

Page 16: ...h door normally closed Magnetron antenna 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 secure th...

Page 17: ...e 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 18: ... SCREW TAPPING T1 TRS 4 10 MFZN 2 2 3511409700 COVER INSU T AS KOC 621Q0S 1 3 3512513110 GUIDE AIR OUTLET SA1D 80 T0 5 1 4 7392500011 NUT HEX 6N 2 5 MFZN 1 5 7392500011 NUT HEX 6N 2 5 MFZN 1 6 3512803300 HEATER 230V 1150W 1B08965 1 Caution In this Service Manual some parts can be changed for improving their performance without notice in the parts list So if you need the latest parts information pl...

Page 19: ... PART CODE PART NAME DESCRIPTION Q TY REMARK 1 7122400811 SCREW TAPPING T2S TRS 4 8 MFZN 1 2 7113400814 SCREW TAPPING T1 BIN 4 8 MFNI 1 3 3512802000 HEATER U 230V 400W R1837400 1 4 3515304000 SUPPORTER HEATER STS430 T0 5 1 5 3511404410 COVER HEATER U STS430 2B HL T0 6 1 CUTTING 8EA Caution In this Service Manual some parts can be changed for improving their performance without notice in the parts ...

Page 20: ... closed 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 two mounting screws b Adjust interlock switch assembly position c Make sure that lock lever moves smoothly after adjustment is complet...

Page 21: ...n of 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 conta...

Page 22: ...tment 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 ...

Page 23: ...ds to magnetron terminal and magnetron body Continuity Defective magnetron 2 1 Check resistance of primary and secondary coil of high voltage transformer 0 Ω 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 ...

Page 24: ... Adjust or replace Defective touch control circuit 0V Approx 13V DC Replace Check continuity of heater Defective heater No continuity Replace TROUBLE 5 Fan motor does no rotate CONDITION CHECK Check continuity of primary interlock switch Malfunction of primary Interlock switch RESULT No continuity Adjust or replace Fan does not rotate Check D C voltage being supplied to RELAY RY6 coil Faulty conta...

Page 25: ... for continuity of the pad Malfunction of Membrane RESULT Normal CAUSE REMEDY Replace C PANEL assembly Display does not show programming at all even if keyboard is touched TROUBLE 7 The following visual conditions indicate a probable defective touch control Circuit or Membrane 1 Incomplete segments 1 segment missing 2 partial segments missing 3 digit flickering other than normal fluorescent slight...

Page 26: ...inuity of thermistor resistance of thermistor Defective thermistor RESULT 0Ω or infinite Replace Err 2 or Err 3 come on display Check continuity of heater upper lower Defective touch control circuit Replace Approx 200k 300kΩ room temperature Defective heater No continuty continuity Replace ...

Page 27: ...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 selected so that the maximum difference between the ambient and final water temp...

Page 28: ...e 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 in from any metal If it does not erroneous reading may result M W 1 Roast Beef 3 Roast Chicken 5 Vegeta...

Page 29: ...mmeter 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 seve...

Page 30: ...29 9 4 COMPONENT ACTION COOKING MODE MANUAL M W MODE GRILL COMBI TEMP DEFROST AUTO ROAST BEEF COOK ROAST PORK ROAST CHICKEN FISH FILLETS VEGETABLE MAGNETRON UPPER ELEMENT LOWER ELEMENT ...

Page 31: ...30 10 WIRING DIAGRAM ...

Page 32: ...31 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 33: ... 1 F30 TRANS HV DW R80S0 62T 3518118710 1 F31 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 3516003700 4 F32 BASE SBHG T0 8 3510310800 1 F33 FOOT DASF 310 3512101400 4 F34 SCREW TAPPING T1 TRS 4 10 MFZN 7112401011 5 F35 SCREW TAPTITE TT3 TRS 4X8 MFZN 7272400811 2 F36 STOPPER HINGE U AS KOR 121M0A 3515202800 1 F37 HARNESS MAIN KOC 621Q0S 3512718900 1 F38 SW MICRO VP 533A OF SPNO 187 200G 4415A17352 1 F39 SW M...

Page 34: ...ion to 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 10 Voltage olad DC 13V Voltage no load DC 14V NO CHECK POINT REMARK 1 IC1 PIN 55 64 5VDC 5 2 IC1 PIN 17 3 IC1 PIN 30 OR 31 T 20 ms 50Hz 5V 0V T T 250 ns 4MHz 5V 0V T NO MEASURE POINT WAVE FORM REMEDY REMARK ...

Page 35: ...Y 5 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 6 does not operate STATE RELAY 1 ON RELAY 1 OFF POINT A 5V DC GND POINT B GND 13V DC M W RY1 B G5G 1A DT 12V D2 1N4148 Q10 A C106M 8 STATE RELAY 5 ON RELAY 5 OFF POINT A 5V DC GND POINT B GND 13V DC LAMP TRAY RY5 D15 1N4148 B CS11 12SH 12V ...

Page 36: ...ating of lower grill When touching TEMP button oven lamp turns on and Fan motor and turntable rotate and cook indicator in display comes on Cause RELAY 4 does not operate STATE RELAY 3 ON RELAY 3 OFF POINT A 5V DC GND POINT B GND 13V DC UPPER GRILL RY3 G5G 1A DT 12V D4 1N4148 B Q11 C106M A 14 STATE RELAY 4 ON RELAY 4 OFF POINT A 5V DC GND POINT B GND 13V DC LOWER GRILL RY4 CS11 12SH 12V D14 1N4148...

Page 37: ...count down timer does not stop POINT STATE DOOR OPEN DOOR CLOSED A OPEN CLOSE B 5V DC GND A B CN1 D O M SW 1 2 35313 0210 D1 1N4148 R1 1K 5V R4 10K C1 104Z 7 CHECK NO METHOD REMEDY 1 Check the stage ON OFF of the door open Replace door open monitor swith monitor switch by resistance measurement ...

Page 38: ...37 13 P C B CIRCUIT DIAGRAM ...

Page 39: ...W 4 7K Ohm 5 RD AZ472J 2 24 RESISTOR R5 R9 R17 R18 1 6W 100K Ohm 5 RD AZ104J 4 25 RESISTOR R31 1 6W 1M Ohm 5 RD AZ105J 1 26 RESISTOR R33 1 6W 200 Ohm 5 RD AZ201J 1 27 RESISTOR R10 R16 1 6W 330 Ohm 5 RD AZ331J 7 28 RESISTOR R41 R43 1 2W 27 Ohm 5 RD 2Z270JS 3 29 RESISTOR R6 1 6W 5 88K Ohm 1 RN AZ5881F 1 30 RESISTOR R7 1 6W 16 9K Ohm 1 RN AZ1692F 1 31 RESISTOR R8 1 6W 1 30K Ohm 1 RN AZ1301F 1 32 RESI...

Page 40: ...S M NO C621Q0S002 DAEWOO ELECTRONICS CO LTD 686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA TELEX DWELEC K28177 8 CABLE DAEWOOELEC PRINTED DATE Feb 2002 ...

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