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Service Manual - Daewoo

1. ASS V PART LIST NO NAME SYMBOL SPECIFCATION PART CODE 1 BUZZER 21 BM 20K 3515600100 1 2 ARRAY 1 5P 4 102 M 50V CNAXB 102M 1 3 C1 11 104 50V Z AXIAL CCZF1H104Z 11 4 C ELECTRO 50V RS 10uF CEXE1H100A 1 5 ELECTRO 2 50V RSS 100uF CEXF1H101V 1 6 ELECTRO EC3 4 50V RSS 220uF CEXF1H221V 2 7 C ELECTRO EC5 35V RSS 1000uF CEXF1V102V 1 8 CONNECTOR WAFER CN1 35313 0210 30166M7020 1 9 CONNECTOR WAFER CN2 35312 0310 30166M5030 1 10 CONNECTOR FILM CN3 HLEM15S 1 4CW215SBDO 1 11 CONNECTOR WAFER CN4 35328 0610 4CW3061MX0 1 12 DIODE 01 6 8 14 17 144148 DZN4148 14 13 DIODE D15 16 18 21 1N4004A DZN4004A 6 14 DIODE ZENER 201 UZ 3 3BSB DZUZ3R3BSB 1 15 DIODE ZENER ZD2 UZ 3 9BSB DZUZ3R9BSB 1 16 DIODE ZENER ZD3 UZ 24BSB DZUZ24BSB 1 17 DIODE ZENER ZD4 UZ 5 6BSB DZUZ5R6BSB 1 18 DISPLAY VFD DP1 SVM 5MS06 DSVM5MS06 1 19 HOLDER VFD DPH1 PP 3513002000 1 20 PCB MAIN M236 95x235 3514323520 1 21 ARRAY RA1 5P 4 1 8 100K J RA 85X104J 1 22 GARBON FILM R28 1 2W 27 5 RD 22270JS 1 23 R CARBON FILM R20 25 1 2W 200 590 RD 2Z201JS 6 24 R CARBON FILM R1 1 4W 6 8 5 0 47689 1 25 7 1 6W 200 5 RD AZ201J 1 26 R CARBON FILM R2 6 17 19 26 1 6W 1K 5 RD AZ102J 6 27 R FILM R3 5 11 1 6W 10K 5 RD AZ103J 3 28 R CARBON
2. 22 TROUBLE 6 The following visual conditions inditions indicate a probable defective touch control Circuit or button P C B assembly Incomplete segments 1 segment missing 2 partial segments missing 3 digit flickering other than normal fluorescent slight flickering 2 A distinct change in the brightness of one or more numbers exists in the Exo DAQT LS displav 3 One or more digits in the displav are not on when thev should be j l 4 Display does not count down or up with time cooking or clock operation 9 5 Oven is programmable and cooks normally but no display shows A sp u2 6 Display obviously jumps 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 RY4 contacts close and if they are close replace touch control circuit CONDITION CHECK RESULT CAUSE REMEDY Display does Check each button for
3. NO PART CODE PART NAME DESCRIPTION Q TY A00 3511714520 DOOR AS KOC 924T0S 1 B00 3516725640 CONTROL PANEL AS KOC 924T0S 1 3516725650 KOC 924T5S FO1 3516003700 SPECIAL SCREW TT3 HEX 4 8 FLG MFZN 2 F02 3512521000 GUIDE ROLLER AS KOC 1BOKOS 1 F03 3517205200 TRAY METAL SPP 0 6 1 FO4 3517202611 TRAY RACK AS 961 05 117MM 1 F05 3517401900 COUPLER PTFE 1 F06 3511408300 COVER WAVE GUIDE MICA T0 35 1 F07 3516112320 CAVITY AS KOC 924T0S 1 F08 3512767000 HARNESS HEATER KOC 1BOKOS 1 F09 3510607700 BRACKET HEATER T SA1D 80 T0 5 1 F10 3512803800 HEATER MIRACLON 115V 550W 270MM 2 F11 3511407600 COVER HEATER T STS430 0 5 1 F12 7112401011 SCREW TAPPING T1 TRS 4 10 MFZN 1 F13 3512520500 GUIDE AlR OUTLET SA1D 80 T0 5 1 F14 3513303000 INSULATOR HEATER T SECC T0 5 1 F15 7112401011 SCREW TAPPING T1 TRS 4 10 MFZN 2 F16 7121400611 SCREW TAPPING T2S PAN 4 6 MFZN 1 F17 3518906310 THERMOSTAT OFF 100 ON 60 V 187 1 F18 7112401011 SCREW TAPPING T1 TRS 4 10 SE MFZN 2 F19 3519450 5 KOC924TOS CORD POWER AS 3 1 5 80 80 120 RTML 1 0 924 05 1 35113A5QM5KOC924T59 3 1 0 80 80 120 RTML 1 4M KOC 924T5S F20 3511800100 FAN GF20 1 F21 3963513010 MOTOR SHADED POLE 230 25W 15 01 1 F22 3512515300 GUIDE WIND PP 1 F23 3518605001 KOC 92470S NOISE FILTER DWLF M05 KOC 924T0S 1 3618605500 KOC 924T5S DWLF MO7 KOC 924T5S F24 78312X40M1 SCREW SPECIAL T1 TRS 4710 SE MFZN 1
4. 24 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 Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the test PROCEDURE 1 Prepare Microwave Energy Survey Meter 600cc glass beaker and glass thermometer 100 C 212 F 2 Pour 275cc 15cc of tap water initially at 20 5 C 68 9 F in the 600 cc glass beaker with an inside diameter of approx 95 mm 3 5 3 Place it at the center of the tray and set it in a cavity 4 Close the door and operate the oven 5 Measure the leakage by using Microwave Energy Survey Meter with dual ranges set to 2450 2 1 Measured radiation leakage must not exceed the value prescribed below Leakage for a fully assembled oven with door normally closed must be less than 4mW Cm2 2 When measuring the leakage always use the 5 cm 2 in space cone with probe Hold the probe perpendicular to the cabinet and door Place the space cone of the probe on the door cabinet door seem door viewing
5. 3 KA A 4 3 1 OUTER DIMENSION 4 3 2 FEATURE DIAGRAM 1 eed edet e a dese EUR cet dr Pee quete Re e 5 4 INSTALLATION E 6 5 CONTROL PANEL i 7 6 DISASSEMBLY AND ASSEMBLY nr in L cu 8 7 INTERLOCK MECHANISM AND ADJUSTMENT nanne 18 8 TROUBLE SHOOTING GUIDE ae neneneeneneneeneneeseneennneenenennnnenenaenennenenennenennenenenneneneenenvenenennenennenen 19 9 MESUREMENT AND TEST E 24 9 1 MEASUREMENT OF THE MICROWAVE POWER OUTPUT 24 9 2 MICROWAVE RADIATION 25 9 3 COMPONENT TEST PROGEDURE 2 t a s e t ERE 26 9 4 COMPONENT ACT ON re ctii 27 10 WIRING DIAGRAM O 28 11 EXPLODED VIEW AND PARTS LIST eneneneeneneeneneenenennennennnenennenenaenenennenennenenvenenennenennenenvenenneneneneenenennenenn 30 11 1 DOOR ASSEMBLY 30 11 2 CONTROL PANEL 30 11 3 TOTAL ASSEMBLY un eneen 30 12 PRINTED CIRCUIT BOARD 33 13 P C B CIRCUIT DIAGRAM 37 1 SAFETY AND PRECAUTIONS 1 FOR SAFE OPERATION Damage that allows the microwave energy that cooks or heats the food t
6. Malfunction of sub Replace not show continuity of the button pcb assembly control box programming sub assembly at all even if keyboard is touched TROUBLE 7 When ERROR 2 ERROR 3 come on display CONDITION CHECK RESULT CAUSE REMEDY ERROR 2 amp Check continuity of thermistor 00 or infinite gt Replace Replace ERROR 3 resistance of thermistor come on ispl ae Approx 200 300kQ room temperature gt i gt NUN Check continuity of heater M Replace convection upper lower SOUTH pas gt gt continuity Defective touch Replace control circuit 23 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 At the start of the test the oven and the empty container at ambient temperature Water having an initial temperature of 10 C 1 C is used for the test The water temperature is measured immediately before it is poured into the container 3 A quantity of 1000g 5g of water is added to the container and its actual ma
7. 924 05 12 KOC 924T5S amperes 230V 50Hz Power supply cord is about 1 2 meters long The voltage used must be the same as specified on this oven Using a higher voltage may result in a fire or other accident causing oven damage Using low voltage will cause slow cooking We are not responsible for damage resulting from use of this oven with a voltage of ampere fuse other than those specified This appliance 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 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 Do not operate the oven if it is colder than room temperature EARTHING INSTRUCTIONS This appliance must be earthed In the event of an electrical short circuit earthing reduces the risk of the electric shock by providing an escape wire for the electric current This appliance is equipped with a cord having a earthing wire with a earthing plug The plug must be plugged into an outlet that is properly installed and earthed WARNING Improper use of the earthing plug can result in a risk of electric shock Consult a qualified electrician of serviceman if the earthing instructions are not completely understood or if doubt exists as to whether
8. 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 Key check point NO CHECK POINT REMARK 1 IC1 PIN 20 21 5VDC 5 2 IC1 PIN 22 Sy vm Ov LI T 20 ms 50Hz 3 PIN 8 OR 9 T 250 ns 4MHz Check method NO MEASURE POINT WAVE FORM REMEDY REMARK 1 MP1 DC 5V 5 Replace ZD4 EC1 NO LOAD 2 MP2 DC 24V 20 Replace D18 21 EC5 NO LOAD NOTE Each measure point must be measured with GND points 33 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 MW m De RY1 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 1 does not operate LAMP In TRAY B RY4 Xie l B pos E Sa Q7 STATE POINT A POINT B RELAY 4 ON 5V DC GND RELAY 4 OFF GND 24V DC 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 A el FAN RY5 STATE POINT A POIN
9. 1 F54 3518400400 DIODE HV HVR 1X 3AB 12KV 187 1 F55 3518302300 CAPACITOR HV 2100VAC 1 1OUE 187 1 F56 3518701400 FUSE HV BKV 0 7A 1 F57 3518118910 TRANS HV DW R10S0 92T 1 F58 7147401011 SCREW TAPPING T2 FLG HEX 4 10 MFZN 4 F59 3512101400 FOOT DASE 310 4 F60 7112401011 SCREW TAPPING T1 TRS 4 10 MFZN 5 F61 3510313600 BASE SBHG T0 8 1 F62 7272400811 SCREW TAPTITE TT3 TRS 4 8 MFZN 1 F63 3515202800 STOPPER HINGE U AS KOR 121M0A 1 F64 7112401011 SCREW TAPPING T1 TRS 4710 MFZN 1 F65 3966510200 MOTOR SYNCRO 230V 25W GM 16 24FD24 1 F66 441BE15203 MOTOR SYNCRO GM 20 24FDB2 KOC 924T0S01 924T5S01 1 F67 3512300301 GASKET C2700W 1 0 924 0501 924 5501 1 F68 7113400814 SCREW TAPPING T1 BIN 4X8 KOC 924T0S01 924T5S01 1 F69 3512521200 GUIDE ROTARY TEFLON 92470501 92475501 1 F70 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN KOC 924T0S01 924T5S01 1 F71 3517605700 UTENSIL BAR AS 910 0501 KOC 924T0S01 924T5S01 1 32 12 PRINTED CIRCUIT BOARD CIRCUIT CHECK PROCEDURE 1 Low voltage transformer check The low voltage transformer is located on the P C B Measuring condition Input voltage 230V Frequency 50Hz NOTE 1 Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage 2 The allowable tolerance of the secondary voltage is within 5 of nominal voltage 2 Voltage Check Terminal Voltage load Voltage no load 6 7 AC 17
10. F25 7121403011 SCREW TAPPING 125 PAN 4 30 MFZN 2 F26 3510803500 CABINET SECC T0 6 1 F27 78312X40M1 SCREW SPECIAL T1 TRS 410 SE MFZN 4 F28 7112401011 SCREW TAPPING T1 TRS 4 10 MFZN 1 F29 3511407300 MOTOR B SA1D 80 T0 5 1 F30 7112401011 SCREW TAPPING T1 TRS 410 MFZN 1 F31 3511407900 COVER B SA1A 80 70 5 1 F32 3511800800 FAN PP GF20 1 F33 3512767600 HARNESS CONVECTION KOC 924T0S 1 F34 7402704600 RINGC CR 5 SK5 1 F35 3963514300 MOTOR SHADED POLE 230V 50HZ MW10CA TO2 1 F36 3513303400 INSULATOR HEATER B SBHG 1 T0 5 1 NO PART CODE PART NAME DESCRIPTION QTY F37 3511409800 COVER HEATER B SA1D 80 T0 5 1 F38 3511800700 FAN CONVECTION SA1D 80 T0 5 1 F39 3512801800 HEATER 230V 1400W 1R18344 1 F40 3513002300 HOLDER HEATER SUS304 T0 5 3 F41 7400104011 WASHER PLAIN PW 1 4 MFZN 1 F42 3512718320 HARNESS MAIN KOC 924T0S 1 F43 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5 12 DACR 1 F44 3518002900 MAGNETRON 2M218J F P 1 F45 7122401211 SCREW TAPPING T2S TRS 4 12 MFZN 1 F46 3513601600 LAMP BL 240V 25W T25 C7A H187 1 F47 3513700800 LEVER LOCK POM 1 F48 4415A17352 SW MICRO VP 533A OF SPNO 187 200 2 F49 3513816000 LOCK PP 1 F50 3513702100 LEVER SW MICRO POM KOG 846T0S 1 F51 4415A66910 SW MICRO VP 531 OF SZM V16 FA 61 2 F52 7S422X4081 SCREW SPECIAL TT3 TRS 4 8 SE MFZN 1 F53 3513003200 HOLDER HV CAPACITOR SECC T0 6
11. MAIN AS KOC 924T0S KOC 924T5S 1 B09 7121301011 SCREW TAPPING T2S PAN 3 10 MFZN 5 B10 3514323820 PCB SUB AS KOC 924T0S KOC 924T5S 1 B11 3516909050 BUTTON FUNCTION B ABS SG 175 SG 0760D COAT 1 Pull out the Main PCB assembly B08 Remove four screws B09 which secure the PCB Sub ASS Y Pull out the Sub PCB assembly B10 Pull out ten buttons from the control panel Pull out Decorator control panel BO3 from the control panel Pull out Window display B02 from the control panel Reverse the above steps for reassembiv 12 1 2 3 4 5 Pull out the Knob volume B01 from the Sub PCB assembly 7 8 9 10 Remove the screw which secure the control panel push up two snap fits and draw forward the control panel assembly Remove four screws B07 which secure the PCB Main ASS Y 6 To remove high voltage capacitor 9 1 Remove 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 reassembiv 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 reassembiv CAUTION Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage Whenever repair work is carried out on magnetron check t
12. screen the exhaust air vents and the suction air vents 3 Measuring should be 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 25 3 COMPONENT TEST PROCEDURE High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle e t 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 Approx 100 21094 Filament winding Approx 0 Primary winding Approx 1 2 Q 2 High voltage capacitor 1 Check continuity of capacitor with meter on the highest OHM scale 2 A normal capacitor will show continuity for a short time and then indicate 10MQ once the capacitor charged 3 A shorted capacitor will show continuous continuity 4 An open capacitor will show constant 10MQ 5 Resistance between each terminal and chassis should be infinite 3
13. the appliance is properly earthed and either If it is necessary to use an extension cord use only 3 wire extension cord that has a 3 blade earthing plug and a 3 slot receptacle that will accept the plug on the appliance The marked rating of the extension cord should be equal to or greater than the electrical rating of the appliance or Do not use an extension cord 5 CONTROL PANEL x o e P KOC 924T0S 924T5S OA O 5 LO 42 6 e LB J KOC 924T0S01 924T5S01 Indicators on the display window 1 COMBI When blinking the oven is operating in COMBI mode 2 GRILL When blinking the oven is operating in GRILL mode 3 MW When blinking the oven is operating in MICROWAVE COOK mode 4 Auto Cook When blinking the oven is operating in AUTO COOK mode 5 Loek When lighting the oven is in CHILD LOCK mode 6 Convection When blinking the oven is operating in CONVECTION mode D Defrost Weight When blinking the oven is operating in WEIGHT DEFROST mode Defrost Time When blinking the oven is operating in TIME DEFROST mode 9 DISPLAY Cooking ti
14. AR ELEMENT TION FAN MANUAL MODE M W GRILL 1 GRILL 2 GRILL 3 COMBI 1 COMBI 2 COMBI 3 COMBI 4 COMBI 5 CONVECTION100 130 CONVECTION140 150 CONVECTION160 250 ONE TOUCH CAKE BREAD CRUSTY AUTO MODE ROAST BEEF ROAST CHICKEN ROAST PORK BAKED FISH BAKED POTATO BAKED POTATO ROAST POTATO FRESH VEGETABLES FROZEN VEGETABLES CASSEROLE 27 NOULSNOVW NH AAA 3913 Hg KOLSIMHAHL MOTHA HOLON NY NOLLOSANOO NO N38 NONE XE BOLON 9 39 JUHM HM 10 ame 19 3 09 3I0N HNBOSSNVEL ASSY TORINOD Filet AVY Wd NIE ABU NOLOSANOO NOLLO3ANOO BAM Od HOLON HOLMS 181050255 L B w NO 340 000 35070 4000 01100 1 28 924 05 924 55 10 WIRING DIAGRAM 0 39 ct 5 1 gt Au e i mm 584 o m ASW ALT INT KNO vv SVHd 31915 Addis 83 08 o ERES HM ON 100 HOLMS HOU
15. DY _ Check continuity of No Malfunction of Adjust or c iial primary interlock switch continuity primary Interlock replace not heated switch 2 2 i Adjust or Check continuity of No Malfunction of secondary interlock switch continuity secondary replace interlock switch Check continuity of No Replace niet Healer continuity Defective heater Check D C voltage gt Ov l Defective touch Replace being supplied to control circuit RELAY RY2 coil Approx gt Faulty contacts of 3 Replace 24V DC RELAY RY2 or open relay coil TROUBLE 5 1 Convection heater is not heated food will not become hot 2 Convection fan motor does no rotate CONDITION CHECK RESULT CAUSE REMEDY TT Malfunction of Adjust or 1 Convection y Check continuity of Lem No heater is not primary interlock switch continuity primary Interlock replace heated switch 2 Convection fanand gt Check continuity of No Malfunction of gt Adjust or motor does secondary interlock i continuity secondary replace not rotate switch interlock switch Check continuity of No Replace ee Def heater or motor U ee ed ee Check D C voltage gt 0 Defective touch Replace being supplied to control circuit RELAY RY3 RY6 coil gt Approx gt Faulty contacts of gt Replace 24V DC RELAY RY3 RY6 or open relay coil
16. FILM R12 1 6W 47K 5 RD AZ473J 1 29 R FILM R9 13 16 27 1 6W 100K 5 RD AZ104J 6 30 R CARBON FILM R4 1 6W 1M 5 RD AZ105J 1 31 METAL FILM R8 1 4W 10K 1 RN 421002F 1 32 METAL FILM R10 1 4W 120K 1 RN 421203F 1 33 RESONATOR CERA CRI CRT4 00MS 5P4ROOMTS 1 34 HD404318S 147S924T00 1 35 TRANSISTOR Q1 KTA 1266Y TZTA1266Y 1 36 TRANSISTOR Q2 4 10 KRC 106M TZRC106M 8 37 TRANSISTOR 011 KTC 3198GR TZTC3198GR 1 38 TRANS POWER LVT1 DMR 210FS SEPVO41410 1 39 SW RELAV RY1 3 G5G 1A DT DC24V 55 0101124 3 40 SW RELAY RY4 6 CS11 24SH 1C 1P 55 0101129 3 41 WIRE COPPER J2 3 7 8 10 12 16 17 19 20 22 1 0 52 TIN COATING 85801052GY 12 42 WIRE COPPER 5 6 13 15 18 21 23 1 0 52 TIN COATING 85801052GV 8 43 WIRE COPPER J4 9 1 0 52 TIN COATING 85801052GV 2 44 WIRE FLAT WF1 15 90 WH C WSJ 159007 1 45 PCB SUB M237 90 200 3514323620 1 46 CONNECTOR FILM 101 HLEM15R 1 4CW215RBD0 1 47 SWTACT SW101 108 110 111 KPT 1115AM 5850101293 10 48 SW ROTARV SW109 SDB161PVB17F 5810109002 1 49 WIRE COPPER J101 103 1 0 52 TIN COATING 85801052GY 3 50 WIRE COPPER SJ1 924158 only 85801052GY 1 WIRE COPPER SJ4 924T0S01 only 85801052GY 1 WIRE COPPER SJ1 4 924T5S01 only 85801052GY 2 WIRE COPPER 924T0S only 85801052GV 0 38 S M NO C924T0S002 DAEWOO DAEWOO ELECTRONICS CO LTD 686 AHYEON DONG MAPO GU SEOUL KOREA BOX 8003 SEOUL KOREA TELEX DWELEC K28177 8 CABLE DAEWOOELEC PRINTED DATE May 2002
17. High voltage diode 1 Isolate the diode from the circuit by disconnecting the leads 2 With 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 and several hundred k Q in the other direction 4 Magnetron For complete magnetron diagnosis refer to Measurement of the Microwave Power Output Continuity checks can only indicate and open filament or a shorted magnetron To diagnose for an open filament or a shorted magnetron 1 Isolate magnetron from the circuit by disconnecting the leads 2 A continuity check across magnetron filament terminals should indicate 0 1 or less 3 A continuity check between each filament terminal and magnetron case should read open 5 Fuse If the fuse in the primary and monitor switch circuit is blown when the door is opened check the primary and monitor switch before replacing the blown fuse In case the fuse is blown by an improper switch operation replace the defective switch and fuse at the same time Replace just the fuse if the switches operate normally 26 4 COMPONENT ACTION COOKING MODE MAGNE TRON UPPER ELEMENT LOWER ELEMENT RE
18. MOUNTING BRACKE BRACKET PRIMARY INTERLOCK SWITCH PRIMARY INTERLOCK SWITCH INTERLOCK MONITOR SWITCH INTERLOCK MONITOR SWITCH DON SWITCH DOM SWITCH DOOR LATCH DOOR LATCH SECONDARY SECONDARY INTERLOCK SWITCH INTERLOCK SWITCH CONDITION DOOR OPEN CONDITION DOOR CLOSE 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 Then the button of the primary interlock switch bring it under ON condition 2 Secondary interlock switch and interlock monitor switch When the door is 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 ADJUSTMENT Interlock monitor switch When the door is closed the interlock monitor switch should be opened before other switches are closed When the door is opened the interlock monitor switch should be closed after other switches are opened 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 completely two mounting screws NOTE Mic
19. NON E YOON Ad KOC 924T0S01 924T5S01 NOULSNOWN LONLINOMIJN ce 31 YOLON 3003098 WO 08 de SOLON NLL MOTBA N30 0 SOLON 3 X0 M WIND 10 SOD 3000 enl a M ASSY gd 5 z ANB N AVY BH Wi AVT MA i m yd Y NOLO3ANDO kejl e I F P 7 AWWONODIS Tri mua Y HH W Waan V i 3 s lii Ng EE 39 S 9 lt m PED nu a sidt W ka 881 9 f e o j f ASSY OAT NN i TIONS TT ul Qu Alddfs o Dof DOT y HM WN 0 y HOLS RUNS 3L HIH 29 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 Va 30
20. S M No 924705002 Service Manual Microwave Oven Model KOC 924T0S KOC 924T5S KOC 924T0S01 KOC 924T5S01 DAEWOO ELECTRONICS LTD http svc dwe co kr May 2002 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 b Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source and make repairs if 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 magnetron wave guide or transmission line and cavity 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 lt nnenennnneneneeneneenrneeneneneeneneeansenaenenennenennenenneneneenenennenenvenenenneneneenennenenennenenensen 2 2 SPECIFICATIONS
21. T B RELAY 5 ON 5V DC GND RELAY 5 OFF GND 24V DC 34 4 Case of no heating of top grill When touching GRILL or 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 GRILL RY2 STATE POINT A POINT B RELAY 2 ON 5V DC GND RELAY 2 OFF GND 24V DC 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 B A Tan qs B i CONV D11 18 GRILL RES Eo Q4 RY3 STATE POINT A POINT B RELAY 3 ON 5V DC GND RELAY 3 OFF GND 24V DC 35 6 Case of no stopping of the count down timer When the door is opened during operation the count down timer does not stop A B CN1 1 l O T ANN T 23 2 QO D6 T R3 C2 POINT A B STATE DOOR OPEN OPEN 5V DC DOOR CLOSED CLOSE GND CHECK NO METHOD REMEDY Check the stage ON OFF of the door open 1 monitor switch by resistance Replace door open monitor swith measurement 36 13 PC B CIRCUIT DIAGRAM ers an ee ae 9 n 5858838388558 37
22. TURNTABLE TRAY Rotates during cooking and ensure even distribution of Microwaves It can also be used as a cooking utensil 9 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 oven for all cooking 11 CONVECTION OUTLET amp FAN 12 OVEN FRONT PLATE 13 DOOR SEAL Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage 14 BARBECUE BAR KOC 924T0S01 KOC 924T5S01 Not seen This is used barbecue cooking 4 INSTALLATION Steady flat location This microwave oven should be set on a steady flat surface This microwave oven is designed for counter top use only 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 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 Position the oven as far from them as possible Away from heating appliances and water taps Keep the oven away from hot air steam or splash when choosing a place to position it or the insulation might be adversely affected and breakdowns occur Power supply e Check your local power source This microwave oven requires a current of approximately 15
23. TY VOLUME 1 0 Cu Ft MODEL KOC 924T5S KOC 924T5S01 POWER SUPPLY 230V 50HZ SINGLE PHASE WITH EARTHING MICROWAVE 1500W POWER GRILL 1150W CONSUMPTION CONVECTION 1450W COMBINATION 1500W MICROWAVE ENERGY OUTPUT 1000W IEC705 MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS W X H X D 542X329X515mm 21 3X13 0X20 3 in CAVITY DIMENSIONS W X H X D 350X230X355mm 13 8X9 1X14 0 in NET WEIGHT APPROX 20kg 44 1 Ibs TIMER 60 minutes FUNCTION SELECTIONS MICROWAVE GRILL CONVECTION COMBINATION BBQ POWER SELECTIONS 10 LEVELS CAVITY VOLUME 1 0 Cu Ft Specifications are subject to change without notice 3 EXTERNAL VIEW 1 OUTER DIMENSION 542 ooo L 329 515 TAI 2 FEATURE DIAGRAM 1 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 2 DOOR VIEWING SCREEN Allows viewing of food The screen is designed so that light can pass through but not the microwave 3 METAL RACK 4 TOP HEATER Turns on when convection grill and combi cooking is selected 5 OVEN LAMP Automatically turns on during oven operating 6 SAFETY INTERLOCK SYSTEM 7 CONTROL PANEL 8
24. ation 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 Use an insulated screwdriver and wear rubber gloves when servicing the high voltage side 3 Discharge the high voltage capacitor before touching any oven components or wiring 1 Check the grounding Do not operate on a two wire extension cord The microwave oven is designed to be used while grounded It is imperative therefore to make sure it is grounded properly before beginning 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 20A fuse is blown out due to the operation of the monitor switch replace primary interlock switch secondary interlock switch and interlock monitor switch 5 After repair or replacement of parts make sure that the screws are properly tightened and all electrical connections are tightened 6 Do not operate without cabinet CAUTION Service personnel should remove their watches whenever working close to or replacing the ma
25. convection B 5 Remove four screws 6 and then pull out the Rear heater assembly Remove a Nu t and the pull out the Fan convection0 Pull out the 2 from the Cover Heater B 7 Remove two screw and then separate the Insulator heater B 8 and Motor shaded pole Remove the C Ring and then pull out from Motor shaft 3 4 5 6 Remove three screws 9 and then separate the Cover heater B 7 and the Insulator heater B 8 7 8 9 10 Reverse the above steps for reassebly 16 12 To remove Barbecue motor svncro and Guide rotary part REF NO PART CODE PART NAME DESCRIPTION Q TY REMARK 1 441BE5203 MOTOR SYNCRO GM 20 24FDB2 1 2 3512300301 GASKET C2700W T1 0 1 3 7113400814 SCREW TAPPING T1 BIN 4X8 MFNI 2 4 3512521200 GUIDE ROTARY TEFLON 1 5 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 1 1 2 FIS RS 3 4 Remove a screw 3 and then pull out Motor 1 Pull out the Gasket 2 from the Motor syncro Remove a screw 5 and then pull out Rotary guide Reverse the above steps for reassembly 17 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 SITOH MOUNTING SWITCH
26. door plate Remove the door frame from door plate Remove the stopper hinge top from door plate Remove the spring and the hook Remove the handle door and barrier screen outer from door frame Reverse the above steps for reassembly 3 4 5 6 7 4 Method to reduce the gap between the door seal and the oven front surface 1 To reduce gap located on part A Loosen two screws on stopper hinge 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 11 5 To remove control panel parts l 255 eee eeeee PART CODE PART DESCRIPTION Q TY REMARK B01 3513406310 KNOB VOLUME ABS SG 175 SG 0760D 1 B02 3515501820 WINDOW DISPLAY PMMA 1 B03 3511608100 DECORATOR C PANEL SUS430 T0 5 H L 1 B04 3516003940 SPECIAL DOUBLE 51 161 TO 15 1 B05 3516725220 CONTROL PANEL ABS XR 401 SG 0320G 1 B06 3516909040 BUTTON FUNCTION A ABS SG 175 SG 0760D COAT 1 B07 71222401211 SCREW TAPPING T2S TRS 4 12 MFZN 4 B08 3514323740 PCB
27. e gt D high voltage capacitor terminals high voltage with wires removed transformer Check continuity of TP Continuity gt Defective high Replace L_ high voltage rectifier in forward in backward voltage rectifier and backward direction direction with DC megger Connectmeggerleadsto M gt Continuity Defective gt 2 gt magnetron terminal and magnetron magnetron body gt Check D C voltage gt 0V gt Defective Replace being supplied to touch control RELAY RY1 coil circuit Approx Faulty contacts of Replace 24V DC RELAY RY1 or open relay coil 1 Check resistance of primary 0006 Defective Replace and secondary coil of high high voltage voltage transformer transformer t Check continuity of filament No continuity Defective high Replace terminal of high voltage voltage transformer transformer D Check continuity of m No continuity gt Defective Replace magnetron heater with wires magnetron removed 21 TROUBLE 4 Grill heater upper heater is not heated food will not become hot CONDITION CHECK RESULT CAUSE REME
28. gnetron WARNING When servicing the appliance take care when touching or replacing high potential parts because of electrical shock or exposing microwave These parts are as follows HV Transformer Magnetron HV Capacitor HV Diode 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 REF NO PART CODE PART NAME DESCRIPTION Q TY REMARK A01 3512603620 HANDLE DOOR S455G 1 A02 3511608300 DECORATOR DOOR R SUS430 T0 5 H L 1 A03 3512204820 FRAME DOOR ALLOY PC ABS 1 A04 700150301 1 SCREW MACHINE PAN 5 30 MFZN 2 A05 3515101800 SPRING HOOK PW1 1 A06 3513101200 HOOK POM 1 A07 3512302400 GASKET DOOR PBT 1 A08 3516602200 DOOR PLATE SBHG 3A 0 7 1 A09 3515304800 SUPPORTER HINGE T SCP 1 T2 0 1 A10 3517007000 BARRIER SCREEN I TEMP GLASS T2 0 1 A11 3511608700 DECORATOR DOOR T 505430 T0 5 H L 1 12 3511608400 DECORATOR DOOR L SUS430 T0 5 H L 1 A13 3511608200 DECORATOR DOOR U SUS430 T0 5 H L 1 1 Remove the gasket door from door plate 2 Remove screws from
29. he microwave leakage It shall not exceed 4mW cm for a fully assembled oven with door normally closed Metallic Magnetron Wave guide Magnetron antenna antenna a Filament terminal lt MAGNETRON gt Metallic gasket plate 13 8 To remove wind guide assembly 1 Remove a screw for earthing 2 Remove the noise filter from the wind guide 3 Remove a screw which secure the 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 reasembiv 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 14 10 To remove Top heater assembly parts REF PART CODE PART NAME DESCRIPTION QTY REMARK 1 7112401011 SCREW TAPPING 1 TRS 4 10 MFZN 1 2 3512520500 GUIDE OUTLET SA1D 0 5 1 3 3513303000 INSULATOR HEATER T SECC 0 5 1 4 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 2 5 3512767000 HARNESS HEATER 1 0 05 1 6 3510607700 BRACKET SA1D 0 5 1 7 3512803800 MIRACLON 115V 550W 270 2 8 3511407600 COVER HEATER T STS430 T0 5 1 1 Re
30. k continuity of No Malfunction of Heplace both primary and secondary Continuity interlock switch interlock switch with door closed Continuity Check continuitv of Continuit gt Shorted contacts primary interlock switch contact of primary with door partially open until interlock Switch interlock monitor switch contact close COM NC close Q or infinite Replace Check continuity of Defective low p primary winding of low voltage voltage transformer Approx transformer gt 4800 6200 normal Disconnect high voltage gt Fuse again Defective Replace fuse and operate the unit blows high voltage transformer 19 CONDITION CHECK RESULT CAUSE REMEDY Outlethas Check continuity of f Defective gt Replace proper magnetron continuily magnetron voltage fuse does not blow Check continuity of noise filter No Defective line Bead board continuity filter board p Check continuity of 0 No j Open power Replace power supply cord continuity supply cord No f Defective touch Replace continuity control circuit NOTE All these switches must be replaced at the same time please refer to 7 Interlock mechanism and adjust for adjustment instructions TROUBLE 2 Display shows all figures selected but oven does not start cooking e
31. manufacturer immediately 2 3 4 5 IMPORTANT The wire in this mains lead coloured in accordance with the following code Green and yellow Earth Blue Neutral Brown Live As the colours of the wires in the mains lead of this appliance may not correspond with the coloured markings identifying the terminals in your plug proceed as follows The wire which is coloured green and yellow must be connected to the terminal in the plug which is marked with the letter E earth symbol or coloured green and yellow The wire which is coloured blue must be connected to the terminal which is marked with the letter N or coloured black The wire which is coloured brown must be connected to the terminal which is marked with the letter 1 or coloured red NOTE This oven is designed for counter top use only 2 SPECIFICATIONS MODEL KOC 924T0S KOC 924T0S01 POWER SUPPLY 230V 50HZ SINGLE PHASE WITH EARTHING MICROWAVE 1500W POWER GRILL 1150W CONSUMPTION CONVECTION 2550W COMBINATION 3000W MICROWAVE ENERGY OUTPUT 1000W IEC705 MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS W X H X D 542X329X515mm 21 3X13 0X20 3 in CAVITY DIMENSIONS W X H X D 350X230X355mm 13 8X9 1X14 0 in NET WEIGHT APPROX 20kg 44 1 Ibs TIMER 60 minutes FUNCTION SELECTIONS MICROWAVE GRILL CONVECTION COMBINATION BBQ POWER SELECTIONS 10 LEVELS CAVI
32. me power level indicators and time are displayed g When blinking you can input the weight of food for cooking 2 BARBECUE When blinking the oven is operating in barbecue KOC 924T0S01 924T5S01 only Buttons on the control panel f AUTO COOK Press to select the auto cook menu 2 COMBI Press to select the combi cooking mode B GRILL Press to select the grill cooking mode MW Press to select a microwave power level b CONVECTION Press to select convection temperature WEIGHT DEFROST Press to select the weight defrosting cooking KOC 924T0S 924T5S only AUTO DEFROST Press to select the auto defrosting cooking KOC 924T0S01 924T5S01 only 47 TIME DEFROST Press to select the time defrosting cooking 924 05 924 55 only BARBECUE Press to select the barbecue cooking KOC 924T0S01 924T5S01 only CLOCK Press to set the clock DIAL KNOB Turn the dial knob to the cooking time the weight of food or the quantity of food STOP CLEAR Press to stop the oven operation or to delete programmed cooking data 07 START SPEEDY COOK Press to start a programmed cooking or for the speedy start In the case the microwave cooking time increases to 5 minutes by 30 seconds every pressing 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 oper
33. move a screw 1 and pull out Guide air outlet 2 2 Remove two screws 4 and pull out insulator heater t 3 3 4 5 6 7 Pull out the Top heater assembly Pull out the Harness heater 5 Pull out the Braket heater t from the Cover heater t 8 Pull out the Heater miraclon 7 from the Cover heater t 8 Reverse the above steps for reassembly 15 11 To remove Rear heater assembly parts REF NO PART CODE PART NAME DESCRIPTION QTY REMARK 1 3511407300 COVER MOTOR B SA1D 80 T0 5 1 2 7112401011 SCREW TAPPING TRS 4710 MFZN 1 3 7112401011 SCREW TAPPING T1 TRS 4710 MFZN 1 4 3511407900 COVER B SA1D 80 T0 5 1 5 3512767600 HARNESS CONVECTION KOC 924T0S 1 6 7113400814 SCREW TAPPING T1 BIN 4 8 MFNI 4 7 3511409800 COVER HEATER B SA1D 80 T0 5 1 8 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 HOLDER HEATER 505430 T 5 3 12 3512801800 HEATER 230V 1400W 1R18344 1 13 7400104011 WASHER PLAIN PW 1 4 MFZN 1 14 7051400811 SCREW MACHINE PAN 4 8 SW MFZN 2 15 3963514300 MOTOR SHADED POLE 230V 50HZ MW10CA T02 1 16 3511800800 FAN P P GF20 1 17 7402704600 RING CR 5 SK5 1 1 Remove a screw 1 and pull out Cover motor 2 2 Remove a screw 3 and pull out Cover Pull out the Harness
34. o escape will result in poor cooking and may cause serious bodily injury to the operator IF ANY OF THE FOLLOWING CONDITIONS EXIST OPERATOR MUST NOT USE THE APPLIANCE Only a trained service personnel should make repairs 1 A broken door hinge A broken door viewing screen A broken front panel oven cavity A loosened door lock A broken door lock The door gasket plate and oven cavity surface should be kept clean No grease soil or spatter should be allowed to build up on these surfaces or inside the oven DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN The microwave oven has concealed switches to make sure the power is turned off when the door is opened Do not attempt to defeat them DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL 2 FOR SAFE SERVICE PROCEDURES 1 If the oven is operative prior to servicing a microwave emission check should be performed prior to servicing the oven 2 If any 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 open the service person should tell the user not to operate the oven and contact the
35. rowave emission test should be performed after adjusting interlock mechanism If the microwave emission exceed 4mW cm readjust interlock mechanism 18 8 TROUBLE SHOOTING GUIDE Following the procedure below to check if the oven is defective or not 1 2 3 4 your meter NOTE When electric parts are checked be sure the power cord is not inserted the wall outlet Check grounding before trouble checking Be careful of the high voltage circuit Discharge the high voltage capacitor 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 Check wire harness wiring and connection of the terminals and power cord before check the parts listed below TROUBLE 1 Oven does not operate at all any inputs can not be accepted CONDITION CHECK RESULT CAUSE REMEDY Fuse blows gt Check continuity of gt Continuity gt Malfunction of interlock monitor switch with Interlock door closed GOMoNC monitor switch COM NC L No continuity Chec
36. ss obtained The container is then immediately placed in the centre of the oven shelf which is in its lowest normal position The oven is operated and the time for 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 low heat capacity 4 The microwave power output is calculated from the formula P 4 187 mw 2 Ti 0 55 mc Te To t where P is the microwave power output in watts mw is the mass of the water in grams me is the mass of the container in grams To is ambient temperature in degrees Gelsius is the initial temperature of the water in degree Gelsius Tz is the final temperature of the water in degrees Celsius t 15 the heating time in seconds excluding the magnetron filament heating up time The microwave power output is stated in watts rounded off to the nearest 50W CAUTION 1 Water load should be measured exactly to 1 liter 2 Input power voltage should be exactly specified voltage Refer to SPECIFICATIONS 3 Ambient temperature should be 20 2 C 68 3 6 F Heating time for power output T gt To A second 70 64 60 56 52 49 47 44 42 40 38 W 600 650 700 750 800 850 900 950 1000 1050 1100
37. ven though desired program and time are set and start button is tapped CONDITION CHECK RESULT CAUSE REMEDY inui Malfunction of i Turn table Check continuity of No xY A Adjust or motor and primarv interlock switch continuitv primary Interloc replace oven lamp switch do not turn on Check continuity of No Malfunction of Adjust or PPI secondarv interlock d continuity gt secondary esi replace and D O M switch Interlock and D O M switch Check D C voltage FTO ov l Defective touch gt Replace being supplied to control Circuit RELAY RY4 coil gt Approx gt Fault contacts 3 Replace 24V DC of RELAY RY4 or open relay coil 20 TROUBLE 3 No microwave oscillation even though fan motor rotates CONDITION CHECK RESULT CAUSE REMEDY No gt Check continuity of gt No gt Defective Replace microwave high voltage fuse continuity high voltage oscillation fuse gt No microwave oscillation Check continuity of gt Continuily gt Defectiv

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