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Daewoo KQG-8B7R5SSC, Service Manual, Page: 1 / 37

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Service Manual

Microwave Oven

Model: KQG-8B7R5SSC

S/M No. :

Feb. 2013

✔

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 KQG-8B7R5SSC

Page 1: ...No Feb 2013 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: ...k 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 e A microwave leakage check to verify compliance with the federal performance standard should be per formed on each oven prior to release to the owner TABLE OF CONTENTS SAFETY AND PRECAUTIONS 2 1 FOR SAFE OPERAT...

Page 3: ...rtified 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 ope...

Page 4: ... W COMBINATION 2200 W MICROWAVE ENERGY OUTPUT 800 W MICROWAVE FREQUENCY 2450 MHz OUTSIDE DIMENSIONS W x H x D 465 x 287 x 364 mm CAVITY DIMENSIONS W x H x D 298 x 230 x 330 mm CAVITY VOLUME 23 L NET WEIGHT APPROX 13 7 Kg TIMER 59min 00sec POWER SELECTIONS 5 LEVELS Specifications are subject to change without notice ...

Page 5: ...4 EXTERNAL VIEW 1 OUTER DIMENSION 465 287 364 ...

Page 6: ...e oven for all cooking 8 8 Roller guide This must always be used for cook ing together with the glass cooking tray 9 9 Glass cooking tray Made of special heat resistant glass Food in a proper receptacle is placed on this tray for cooking 0 0 Door viewing screen Allows viewing of food The screen is designed so that light can pass through but not the microwave q q Door hook When the door is closed i...

Page 7: ...i Used to cook grill combi 4 4 Power Def Used to set power level Used to defrost foods by weight or time 5 5 Clock Used to set clock 6 6 Dial knob Used to set the time and weight 7 7 Start Easy cook Used to start the oven opera tion and also increase the reheat time by 30 sec onds 8 8 Stop Clear Used to stop the oven operation or to erase all entries 3 CONTROL PANEL ...

Page 8: ...ype 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 temperature Thi...

Page 9: ... the oven stops cooking and all information retained To erase all infomation press the STOP CLEAR button once more If the oven door is opened during the oven operation all information is retained 11 When using the GRILL or COMBI mode Do not open the door so often the temperature inside the oven decrease and the cooking may not complete in setting time Never touch the oven window and metal interior...

Page 10: ...air 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 th...

Page 11: ...ward 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 12: ...E DOOR AS KOR 637V 1 A10 7122402011 SCREW TAPPING T2S TRS 4X20 MFZN 2 A11 3511718010 DOOR SUB AS KOR 637V 1 REF NO PART CODE PART NAME DESCRIPTION Q TY REMARK 1 Remove the gasket door from door weld as 2 Remove the barrier screen inner from weld as 3 Remove the door frame from door weld as 4 Remove the stopper hinge top from door weld as 5 Remove the spring and the hook 6 Remove the barrier screen...

Page 13: ... Tighten two screws 3 To reduce gap located on part C Loosen the screw on the interlock switch assembly located the top of the oven body Draw the interlock switch assembly inward as possible to engage with the hook on the door bottom Tighten a screw 4 To reduce gap located on part D Loosen the screw on the interlock switch assembly located the bottom of the oven body 4 Method to reduce the gap bet...

Page 14: ...l 6 Reverse the above steps for reassembly B01 3516719080 CONTROL PANEL SUB AS KOR 637V 1 B02 3515501530 WINDOW DISPLAY PMMA 1 B03 3516907490 BUTTON FUNCTION ABS SG 175 SG 0760D COAT 1 B04 3516908540 BUTTON FUNCTION C ABS SG 175 SG 0760D 1 B05 3511605130 DECORATOR RING ABS SG 0760D SG 175 COAT 1 B06 3513404620 KNOB VOLUME ABS SG 0760D SG 175 COAT 1 B07 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3 ...

Page 15: ...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 for a fully assembled oven with door normally closed Metallic gasket plate Ma...

Page 16: ...ove wind guide assembly 1 Remove the screw for earthing 2 Remove the noise filter from the wind guide 3 Remove the 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 reassembly ...

Page 17: ... part from the base plate 4 Remove 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 screws 2 Remove two Heater Brakets 3 Remove Heaters ...

Page 18: ...ion and presses the button of the secondary interlock switch to bring it under ON condition 3 Adjustment steps a Loosen the mounting screw b Adjust interlock switch assembly position Actuation distance of primary and secondary interlock switch shall be adjusted almost 0 7mm c Make sure that lock lever moves smoothly after adjustment is completed d Tighten completely a mounting screw Hook RD GY RD ...

Page 19: ... the terminals and power cord before check the parts listed below CONDITION CHECK Check continuity of interlock monitor switch with door closed Check continuity of pri mary interlock switch con tact with door partially open until interlock moni tor switch contact close COM NC Malfunction of interlock moni tor switch Shorted con tacts of primary interlock switch RESULT Continuity No Continuity No C...

Page 20: ...lay coil Approx 15 VDC Replace NOTE All these switches must be replaced at the same time please refer to Interlock Mechanism And Adjustment 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 magnetron Defective mag netron RESULT No Continuity CAUSE REMEDY Replace Ou...

Page 21: ...on Defective high voltage rectifier Replace Connect megger leads to mag netron terminal and magnetron body Continuity Defective mag netron Replace Check resistance of primary and secondary coil of high voltage transformer 0 Ω or Defective high voltage trans former Replace Check continuity of magnetron with wires removed No Continuity Defective mag netron Replace Check continuity of filament termi ...

Page 22: ... 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 cancel button 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 M W DEF Grill Combi g NOTE Before following the particular steps listed above in...

Page 23: ...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 select...

Page 24: ...abinet 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 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 ...

Page 25: ...meter 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 oth erwise an infinite resistance may be read in both directions A normal diode s resistance will be infinite in one direction and seve...

Page 26: ...25 WIRING DIAGRAM ...

Page 27: ...ram point 4 2 Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage 3 The allowable tolerance of the secondary voltage is within 5 of nominal voltage NO CHECK POINT REMARK 1 IC 1 PIN 2 21 30 34 5VDC 2 IC 1 PIN 35 3 IC 1 PIN 31 OR 32 T T 20ms 50Hz 0V 5V T T 250ns 4MHz 0V 5V NO MEASURE POINT WAVE FORM REMEDY REMARK 1 MP1 DC 5V 0 25V Replac...

Page 28: ...27 Measure Point ...

Page 29: ...28 Measure Point ...

Page 30: ...ation Cause RELAY 3 does not operate refer to Circuit 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 R16 17 zener diode ZD1 STATE POINT A B RELAY 3 ON 5...

Page 31: ...30 2 PCB CIRCUIT DIAGRAM ...

Page 32: ... 5 RD AZ101J 1 21 R CARBON FILM R1 R7 1 6W 220 5 RD AZ221J 7 22 R CARBON FILM R8 9 11 15 21 1 6W 1K 5 RD AZ102J 5 23 R CARBON FILM R12 1 6W 4 7K 5 RD AZ472J 1 24 R CARBON FILM R16 18 1 6W 10K 5 RD AZ103J 3 24 R CARBON FILM R13 1 6W 100K 5 RD AZ104J 1 25 R CARBON FILM R19 1 6W 1M 5 RD AZ105J 1 26 RESONATOR CERA CR1 KBR 4 0MKSTF 5PKBR40MKS 1 27 SW RELAY RY1 RY3 G5G 1A 1C 1P DC12V 5SC0101121 2 28 SW ...

Page 33: ...ly and assembly 3 TOTAL ASSEMBLY EXPLODED VIEW AND PARTS LIST F37 A00 B00 F43 F46 F45 F44 F42 F41 F39 F40 F38 F55 F54 F52 F49 F50 F48 F47 F53 F03 F01 F02 F19 F18 F21 F24 F23 F22 F25 F26 F27 F34 F36 F35 F33 F32 F29 F30 F28 F17 F12 F14 F13 F15 F16 F11 F07 F05 F06 F08 F09 F10 F04 F31 F51 F20 F51 F20 ...

Page 34: ... QUARTZ 115V 500W 240mm B WADEN 2 F13 3518606100 NOISE FILTER DWLF M13 1 F14 7121402511 SCREW TAPPING T2S PAN 4X25 MFZN 2 F15 3963514400 MOTOR SHADED POLE 230V 50HZ OEM 10DWC2 A07 A 1 F16 3512517000 GUIDE WIND PP 1 F17 3511800300 FAN PP 30 GLASS 1 F18 3518003700 MAGNETRON 2M218JFL 6CF 1 F19 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5X12 DACRO 1 F20 3510610900 BRACKET HEATER SECC T0 5 2 F21 727240081...

Page 35: ...M 1 F41 3513811750 LOCK FH 44N 1 F42 3513601600 LAMP BL 240V 25W T25 C7A H187 1 F43 7112401011 SCREW TAPPING T1 TRS 4 10 MFZN 1 F44 3966031600 MOTOR SYNCRO 220 240V 50 60HZ ST 16 MN73MQAD A 1 F45 3518906710 THERMOSTAT OFF 80 ON 70 H 187 NB 1 F46 3513003410 HOLDER THERMOSTAT PP BK 1 F47 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 2 F48 3511405100 COVER WAVE GUIDE MICA T0 5 1 F49 3517400600 COUPLER XA...

Page 36: ...S M NO DAEWOO ELECTRONICS CORP 1 2 Jeo dong 1 il ga Jung gu Seoul Korea C P O BOX 8003 SEOUL KOREA TELEX DWELEC K28177 8 CABLE DAEWOOELEC PRINTED DATE Feb 2013 ...

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