Daewoo KOR-131G0A Service Manual Download Page 24

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CONDITION

CHECK

RESULT

Continuity

Continuity in

backward

direction

0 Ω

¡Ä

Continuity

0 V

Approx

15 VDC

CAUSE

Defective

high voltage

transformer

Defective

high voltage

rectifier

Defective

magnetron

Defective

magnetron

Defective

high voltage

transformer

Defective

high voltage

transformer

Defective

touch control

circuit

Faulty

contacts of

RELAY

(RY1) or open

relay coil

REMEDY

Replace

No microwave

oscillation

Check continuity of high

voltage rectifier in

forward and backward

direction with DC

megger

Check continuity of high

voltage capacitor

terminals with wires

removed

Connect megger leads to

magnetron terminal and

magnetron body

Check resistance of

primary and secondary

coil of high voltage

transformer

Check continuity of

magnetron with wires

removed

Check continuity of

filament terminal of high

voltage transformer

Check D.C. voltage

being supplied to

RELAY (RY1) coil

Continuity

TROUBLE SHOOTING GUIDE

(

TROUBLE 3 )

No microwave oscillation even though fan motor rotates.

Summary of Contents for KOR-131G0A

Page 1: ... 131S4A DAEWOO ELECTRONICS CO LTD S M No R131GH0A01 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: ...ngsafetychecksonallovenstobeservicedbeforeactivatingthemagnetronorothermicrowave 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 microwav...

Page 3: ...he oven 2 If any 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 operate...

Page 4: ...UMPTION MICROWAVE 1400W 1500W GRILL COMBINATION MICROWAVE ENERGY OUTPUT 1000W 1100W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS W X H X D 563 x 318 x 418 mm 22 1 x 12 5 x 16 5in CAVITY DIMENSIONS W X H X D 380 x 246 x 386 mm 14 9 x 9 7 x 15 2in NET WEIGHT APPROX 16 5kg 36 4lbs TIMER 99min 99 sec 59min 99sec KOR 131S4 FUNCTION SELECTIONS MICROWAVE POWER SELECTIONS 10 LEVELS CAVITY VOLUME 1 3 Cu ...

Page 5: ...4 EXTERNAL VIEW 1 OUTER DIMENSION ...

Page 6: ...D Protects the microwave outlet from splashes of cooking foods 5 OVEN LAMP Automatically turns on during oven operating 6 SAFETY INTERLOCK SYSTEM 7 CONTROL PANEL 8 GLASS COOKING TRAY Made of special heat resistant glass The tray must always be in proper position before operating Do not cook food directly on the tray 9 OVEN FRONT PLATE 10 DOOR OPENING BUTTON To open the door push the door opening b...

Page 7: ...ed to cook or reheat 5 More Used to add time to cooking 6 Less Used to remove time from cooking 7 Auto Defrost Used to defrost foods for weight 8 Power Used to set power level 9 Defrost Used to defrost foods for time 10 Kitchen Timer Used as a minute timer delay cooking hold setting after cooking 11 Clock Used to set clock 12 Stop Clear Used to stop the oven operation or to delete the cooking data...

Page 8: ...Used to add time to cooking 5 Less Used to remove time from cooking 6 Auto Defrost Used to defrost foods for weight 7 Power Used to set power level 8 Defrost Used to defrost foods for time 9 Kitchen Timer Used as a minute timer delay cooking hold setting after cooking 10 Clock Used to set clock 11 Stop Clear Used to stop the oven operation or to delete the cooking data 12 Start Speedy cook Used to...

Page 9: ...ed to add time to cooking 6 Less Used to remove time from cooking 7 Auto Defrost Used to defrost foods for weight 8 Power Used to set power level 9 Defrost Used to defrost foods for time 10 Kitchen Timer Used as a minute timer delay cooking hold setting after cooking 11 Clock Used to set clock 12 Stop Clear Used to stop the oven operation or to delete the cooking data 13 Start Speedy cook Used to ...

Page 10: ... 7 Auto defrost Used to defrost foods for weight 8 Minute plus Used to cook at 100 or to increase the cooking time by simply touching the pad 9 Clock Used to set clock 10 Power level More less Used to set power level Used to increase or decrease the cooking time for Sensor Auto cooking 11 Kitchen timer Used as a minute timer to delay the start of cooking or to set a holding time after cooking 12 S...

Page 11: ...pproximately 12 amperes 120 Volts 60 Hz grounded outlet Power supply cord is about 0 8 meters long 1 A short power supply cord is provided to reduce the risks resulting from becoming entangled in or tripping over a longer cord 2 Longer cord sets or extension cords are available and may be used if care is exercised in their use 3 If a long cord or extension cord is used 1 The marked electrical rati...

Page 12: ...e STOP CLEAR pad is touched during the oven operation the oven stops cooking and all information retained To erase all information except the present time touch the STOP CLEAR pad once more If the oven door is opened during the oven operation all information is retained 10 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...

Page 13: ...ginning 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 du...

Page 14: ...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 reassembly NOTE After replacing the door assembly perform a check of correct alignment with the hinge and cavity front plate ...

Page 15: ...ME DOOR ABS XR 401 SR 0320M KOR 130A 1 3512204500 FRAME DOOR ABS XR 401 SR 0320M KOR 131G H 1 A02 3517006500 BARRIER SCREEN O PEPT T0 25 1 A03 3515202900 STOPPER HINGE T AS KOR 121M0A 1 A04 3511713600 DOOR PAINTING AS KOR 131G0A 1 A05 3517006400 BARRIER SCREEN I PE T0 1 1 A06 3512302200 GASKET DOOR PP 1 A07 3513101400 HOOK POM 1 A08 3515101900 SPRING HOOK PW 1 1 Caution In this Service Manual some...

Page 16: ...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 DISASSEMBLY AND ASSEMBLY ...

Page 17: ...0A 1 3518522400 SWITCH MEMBRANE KOR 131G0A 1 3518522410 SWITCH MEMBRANE KOR 131H0A 1 3518522430 SWITCH MEMBRANE KOR 131S4A 1 B02 3516723900 CONTROL PANEL ABS AF 345 VE 0855 KOR 130A 1 3516723910 CONTROL PANEL ABS AF 345 VE 0855 KOR 131G H 131S 1 B03 PKMPMSXV00 PCB AS KOR 130G0A KOR 130A0A KOR 131G H0A 1 3514323400 PCB AS KOR 131H4A KOR 131H G4A S4A 1 B04 7122401211 SCREW TAPPING T2S TRS 4 12 MFZN ...

Page 18: ...ly 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 install the magnetron without the metallic gasket plate which is packed with each magnetron to pre vent microwave leakage Whenever repair work is carried out on magnetron check the microwave leakage It shall not exceed 4mW cm2 f...

Page 19: ... 131H and KOR 130A 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 reassembly ...

Page 20: ...r from the guide wind 4 Pull the fan from the motor shaft 5 Remove two screws which secure the motor shaded pole 6 Remove the motor shaded pole 7 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 DISASSEMBLY AND ASSEMBLY ...

Page 21: ...pushes the lock lever downward and also presses the button of the interlock monitor switch to bring it under NO condition The lock lever 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 c...

Page 22: ... 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 door closed Replace fuse Check continuity of primary interlock switch contact with door partially open until interlock monitor switch contact close Shorted contacts of primary int...

Page 23: ...ck switch Replace Check continuity of power supply cord Replace 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 Check continuity of primary interlock switch Check continuity of secondary interlock switch Check D C voltage being supplie...

Page 24: ...ace Replace Replace Replace Replace No microwave oscillation Check continuity of high voltage rectifier in forward and backward direction with DC megger Check continuity of high voltage capacitor terminals with wires removed Connect megger leads to magnetron terminal and magnetron body Check resistance of primary and secondary coil of high voltage transformer Check continuity of magnetron with wir...

Page 25: ...isplay obviously 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 programmin...

Page 26: ... vessel 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 selec...

Page 27: ...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...

Page 28: ...ith 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 directio...

Page 29: ...28 WIRING DIAGRAM ...

Page 30: ...1 IC1 PIN 2 21 30 34 5VDC 2 IC1 PIN 35 T 16 7ms 60Hz 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 ...

Page 31: ...30 MP1 MP2 PRINTED CIRCUIT BOARD Measure Point ...

Page 32: ...s opened during operation the count down timer does not stop æ refer to Circuit Diagram Point 1 Check method 5 When the digital clock does not operate properly æ refer to Circuit Diagram Point 5 Ø 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 RELAY 1 ON 5VDC GND RELAY 1 OFF GND 12VDC POINT S...

Page 33: ...32 PRINTED CIRCUIT BOARD 2 P C B CIRCUIT DIAGRAM ...

Page 34: ... 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 9 11 KRA 106M TZRA106M 8 24 TRANSISTOR Q6 KTA 1266Y TZTA1266Y 1 25 TRANS POWER LVT1 DMR 631P 5EPU035302 1 26 WIRE COPPER J1 J21 1 0 52 TIN COATING 85801052GY 21 27 WIRE COPPER SJ3 5 1 0 52 TIN COATIN...

Page 35: ...K 5 RD AZ104J 3 18 RESISTOR R13 1 6W 100 5 RD AZ101J 1 19 RESISTOR R15 17 R19 1 6W 10K 5 RD AZ103J 4 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 9 11 KRA 106M TZRA106M 8 24 TRANSISTOR Q6 KTA 1270Y TZTA1270Y 1 25 TRANS POWER LVT1 DMR 631P 5EPU035302 1 26 WIRE COPPER J1 J21 1 0 52 TIN COATING 85801052GY 21 27 WIRE...

Page 36: ...MARK 1 IC1 PIN 2 21 30 34 5VDC 2 IC1 PIN 35 T 16 7ms 60Hz 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 toler...

Page 37: ...36 PRINTED CIRCUIT BOARD PRINTED CIRCUIT BOARD MP1 MP2 MP3 Measure Point ...

Page 38: ...thod 4 When the door is opened during operation the count down timer does not stop æ Refer to Circuit Diagram Point 1 Check method 5 When the digital clock does not operate properly æ Refer to Circuit Diagram Point 5 Ø If clock does not keep exact time you must check resistor R25 26 zener diodeZD3 POINT STATE A B RELAY 2 ON 5VDC GND RELAY 2 OFF GND 12VDC POINT STATE A B RELAY 1 ON 5VDC GND RELAY 1...

Page 39: ...fter 1 2 minutes R20 24 connecting status of humidity sensor must be checked before checking point A B C D 7 When the oven is plugged in or during operation the display does not turn on æ Refer to Circuit diagram Point 7 Check method NO CHECK POINT REMARK Tolerance 1 A 0 5V Â VALUE Â 3 5V 2 B 11 3Vdc 5 3 C 4 4Vdc 5 4 D 2 2Vdc 5 POINT WAVE FORM A 5VDC B 10 8VDC 1V ...

Page 40: ...39 PRINTED CIRCUIT BOARD 2 PCB CIRCUIT DIAGRAM ...

Page 41: ... DZUZ3R3BSB 1 19 DIODE ZENER ZD2 3 UZ 4 7VB 1 2W DZUZ4R7BSB 2 20 DIODE ZENER ZD4 UZ 5 1BSC 1 2W DZUZ5R1BSB 1 21 DIODE ZENER ZD5 6 UZ 12BSC 1 2W DZUZ12BSC 2 22 HOLDER LCD DPH ARS SG 175 3513003500 1 23 LCD DP1 KXN33180DAP DKXN33180D 1 24 LED LED1 5 DLG 314D DDLG314D 5 25 IC MICOM IC1 TMP87CK29N 1K81 13GS161S2A 1 26 IC IC2 LM358 OP AMP 1CPLM358 1 27 PCB MAIN M172 87 x 175 3514323200 1 28 R ARRAY RA1...

Page 42: ... 2 7 8 KRC 106M TZRC106M 4 47 TRANSISTOR Q3 9 10 KTC 3198GR TZTC3198GR 3 48 TRANSISTOR Q4 KRA 106M TZRA106M 1 49 TRANSISTOR Q5 KTA 1266Y TZTA1266Y 1 50 TRANS POWER LVT1 DMR 161P 5EPU035303 1 51 WIRE COPPER J1 4 7 16 1 0 25 TIN COAT 85801052GY 6 52 WIRE COPPER J5 6 8 12 1 0 25 TIN COAT 85801052GY 4 53 WIRE COPPER J9 11 13 15 1 0 25 TIN COAT 85801052GY 5 NO NAME SYMBOL SPECIFCATION PART CODE Q TY PR...

Page 43: ...42 1 DOOR ASSEMBLY Refer to Disassembly and assembly 2 CONTROL PANEL ASSEMBLY Refler to Disassembly and assembly 3 TOTAL ASSEMBLY 1 KOR 131G KOR 131H and KOR0130A EXPLODED VIEW AND PARTS LIST ...

Page 44: ...TOR SHADED POLE 120V 30W OEM 15DWX1 A03 1 F14 3512520000 GUIDE WIND PP 1 F15 3511800100 FAN PP GF20 1 F16 3518002200 MAGNETRON 2M218J MF P 1 F17 3516003800 SPECIAL SCREW T2 FLANGE 5X8 MFZN 1 F18 7272100811 SCREW TAPTITE TT3 TRS 4X8 MFZN 1 F19 3513003200 HOLDER HV CAPACITOR SECC T0 6 1 F20 3518302200 CAPACITOR HV 2100VAC 0 98uF 187 1 F21 3518400400 DIODE HV HR 1X 3AB 12KV 187 1 F22 3518116710 TRANS...

Page 45: ...003400 HOLDER THERMOSTAT PBT 1 F40 7272400811 SPECIAL TAPTITE TT3 TRS 4X8 MFZN 2 F41 3511406200 COVER WAVE GUIDE HEATPROOF PP 1 F42 3517400620 COUPLER XAREC 1 F43 441X336020 ROLLER KOR 100 S TEFLON 3 F44 3512519300 GUIDE ROLLER PP 5113MF6 A353R 1 F45 441X335A10 TRAY BORO S1 GLASS NFG 1 EXPLODED VIEW AND PARTS LIST Caution In this Service Manual some parts can be changed for improving their perform...

Page 46: ...45 EXPLODED VIEW AND PARTS LIST 2 KOR 131H4 and KOR 131G4 ...

Page 47: ...HV HR 1X 3AB 12KV 187 1 F22 3518116740 TRANS HV DW N11A0 13T 1 F23 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 4 F24 3510313400 BASE SBHG T0 7 1 F25 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 5 F26 3512100900 FOOT PP DASF 130 2 F27 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 1 F28 3515202800 STOPPER HINGE U AS KOR 121M0A 1 F29 3512717410 HARNESS MAIN KOR 131H4A 1 F30 4415A17352 SW MICRO VP 533A OF ...

Page 48: ...47 EXPLODED VIEW AND PARTS LIST 3 KOR 131S4 ...

Page 49: ...N 4 F24 3510313400 BASE SBHG T0 7 1 F25 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 5 F26 3512100900 FOOT PP DASF 130 2 F27 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 1 F28 3515202800 STOPPER HINGE U AS KOR 121M0A 1 F29 3512717410 HARNESS MAIN KOR 131H4A 1 F30 4415A17352 SW MICRO VP 533A OF SPNO 187 200G 2 F31 4415A66600 SW MICRO VP 532A OF SPNC 187 200G 1 F32 4415A66910 SW MICRO VP 531A OF SZM V16 F...

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