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S/M No. : R131G2A001
Service Manual
Micro Wave Oven
Model: KOR-131G2A KOR-131H2A KOR-130A2A
DAEWOO ELECTRONICS CO., LTD.
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 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 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. (e) 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
SAFETY AND PRECAUTIONS ................................................................................................. 3
FOR SAFE OPERATION ............................................................................................................................... 3 FOR SAFE SERVICE PROCEDURES .......................................................................................................... 3
SPECIFICATIONS....................................................................................................................... 4 EXTERNAL VIEW ...................................................................................................................... 5
OUTER DIMENSION .................................................................................................................................... 5 FEATURE DIAGRAM ................................................................................................................................... 6 CONTROL PANEL ........................................................................................................................................ 7
INSTALLATION.......................................................................................................................... 10 OPERATIONS AND FUNCTIONS............................................................................................ 11 DISASSEMBLY AND ASSEMBLY ........................................................................................... 12 INTERLOCK MECHANISM AND ADJUSTMENT ............................................................... 19 TROUBLE SHOOTING GUIDE ................................................................................................ 20 MEASUREMENT AND TEST.................................................................................................... 24
MEASUREMENT OF THE MICROWAVE POWER OUTPUT .................................................................. 24 MICROWAVE RADIATION TEST .............................................................................................................. 25 COMPONENT TEST PROCEDURE ............................................................................................................. 26
WIRING DIAGRAM.................................................................................................................... 27 PRINTED CIRCUIT BOARD..................................................................................................... 28
CIRCUIT CHECK PROCEDURE.................................................................................................................. 28 P.C.B. CIRCUIT DIAGRAM ......................................................................................................................... 31 P.C.B. LOCATION NO .................................................................................................................................. 32
EXPLODED VIEW AND PARTS LIST .................................................................................... 33
DOOR ASSEMBLY ....................................................................................................................................... 33 CONTROL PANEL ASSEMBLY .................................................................................................................. 33 TOTAL ASSEMBLY...................................................................................................................................... 33
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SPECIFICATIONS
MODEL POWER SUPPLY POWER CONSUMPTION MICROWAVE GRILL COMBINATION MICROWAVE ENERGY OUTPUT MICROWAVE FREQUENCY OUTSIDE DIMENSIONS (W X H X D) CAVITY DIMENSIONS (W X H X D) NET WEIGHT TIMER FUNCTION SELECTIONS POWER SELECTIONS CAVITY VOLUME
KOR-131G2A 120V~60Hz, SINGLE PHASE WITH GROUNDING 1500W
1100W 2450MHz 563 x 318 x 418 mm (22.1 x 12.5 x 16.5 in.) 380 x 246 x 386 mm (14.9 x 9.7 x 15.2 in.) APPROX. 16.5 Kg ( 36.4 lbs.) 99 min. 99 sec. MICROWAVE 10 LEVELS 1.3 Cu.Ft.
À ¢ SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
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DISASSEMBLY AND ASSEMBLY
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REF.NO
PART CODE
3518522420 3518522400 3518522410
PART NAME
SWITCH MEMBRANE SWITCH MEMBRANE SWITCH MEMBRANE CONTROL-PANEL CONTROL-PANEL PCB AS SCREW TAPPING LEVER DOOR OPEN SPRING BUTTON BUTTON DOOR OPEN BUTTON DOOR OPEN
DESCRIPTION
KOR-130A0A/130A2A KOR-131G0A/131G2A KOR-131H0A/131H2A ABS AF-345, VE-0855 (KOR-130A) ABS AF-345, VE-0855 (KOR-131G/H) KOR-131G2A/130A2A/131H2A T2S TRS 4x12 MFZN PP SWP DIA 0.7 ABS AF-345, VE-0855 (KOR-131G/H) ABX AF-345, VE-0855 (KOR-130A0A)
QTY
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3516723900 3516723910 3514322650 7122401211 3513702800 441G430171 3516908110 3516908100
1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly. 2) Remove the door open lever from the control panel. 3) Remove three screws which secure the PCB assembly to control panel. 4) Disconnect membrane tail from the connector of the PCB assembly. 5) Detach membrane from the control panel. 6) Remove door open button and button spring from the control panel. 7) Reverse the above steps for reassembly.
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CONDITION Fuse blows.
CHECK
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
RESULT
Continuity No Continuity Continuity
CAUSE
Malfunction of interlock monitor switch
REMEDY
Replace NOTE 1
Shorted contacts of primary interlock switch.
Replace NOTE 1
Check continuity of primary winding of low voltage transformer
0 or infinite Approx. 150~310 (normal)
Defective low voltage transformer
Replace
Disconnect one side of the lead wire connected form high voltage transformer to the high voltage capacitor and operate the unit
Normal
Defective high voltage capacitor Defective high voltage transformer
Replace
Fuse again blows
Replace
CONDITION
Outlet has proper voltage Fuse does not blow.
CHECK
Check continuity of magnetron Check continuity of power supply cord
RESULT
No Continuity No Continuity Normal
CAUSE
Defective magnetron Open power supply cord Defective touch control circuit Malfunction of secondary interlock switch
REMEDY
Replace
Replace
Replace
Display do not shown countdown
Replace
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Turn table motor, and oven lamp do not turn on
CHECK
Check continuity of primary interlock switch
RESULT
No Continuity
CAUSE
Malfunction of primary interlock switch Malfunction of secondary interlock switch Defective touch control circuit Faulty contacts of RELAY (RY2) or open relay coil
REMEDY
Adjust or Replace
Check continuity of secondary interlock switch
No Continuity
Adjust or Replace
Check D.C. voltage being supplied to RELAY (RY2) coil
0V
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Approx 15 VDC
Replace
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CONDITION
No microwave oscillation
CHECK
Check continuity of high voltage capacitor terminals with wires removed Check continuity of high voltage rectifier in forward and backward direction with DC megger
RESULT Continuity
CAUSE Defective high voltage transformer
REMEDY Replace
Continuity in backward direction
Defective high voltage rectifier
Replace
Connect megger leads to magnetron terminal and magnetron body
Continuity
Defective magnetron
Replace
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
0 or
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Replace
No Continuity
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Replace
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Replace
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Replace
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Display does not show programming at all, even if keyboard is touched.
CHECK
Check each pad for continuity of the membrane keyboard for the following keyboard check procedure
RESULT
Normal
CAUSE
Malfunction of touch control circuit of control box sub-assembly Malfunction of the membrane keyboard
REMEDY
Replace control box sub-assembly
Abnormal
Replace the membrane keyborad
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PRINTED CIRCUIT BOARD
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PRINTED CIRCUIT BOARD
3. P.C.B. LOCATION NO
NO
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 BUZZER C ARRAY CAPACITOR ELEC CAPACITOR ELEC CONNECTOR WAFER CONNECTOR WAFER CONNECTOR WAFER DIODE RECTIFY DIODE RECTIFY DIODE ZENER DIODE ZENER LED DISPLAY PCB MAIN R ARRAY RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR RESISTOR REGULATOR TRANSISTOR TRANSISTOR TRANS POWER WIRE COPPER WIRE COPPER IC MICOM RESONATOR CERA SW RELAY SW RELAY CAPACITOR CERA CAPACITOR CERA RESISTOR
NAME
SYMBOL
BZ1 CA1 EC1 EC2 CN1 CN3 CN2 D1~6,9~12,15 D13,14 ZD1 ZD2 DP1 M158 RA1 R1~R7
R8,10,12,14,22,12
SPECIFICATION
BM-20K 7P(6) 102 M 50V 16V RSS 100uF 25V RSS 1000uF YW396-02AV YW396-05AV FCZ254-11 1N4148 1N4004A MTZ 5.1VB 1/2W MTZ 3.9VB 1/2W DDG-631H 81.5X139.9 7P(6) 1/8 100K J 1/6W 330 5% 1/6W 1K 5% 1/6W 100K 5% 1/6W 100 5% 1/6W 10K 5% 1/6W 1M 5% 1/4W 51 5% MC7905C KRA-106M KTA-1270Y DMR-631P 1/0.52 TIN COATING 1/0.52 TIN COATING TMP47C440BN-NG14 KBR-4.0MSTF G5G-1A DC12V OJ-SS-112LM1C1P 102 50V Z AXIAL 104 50V Z AXIAL 1/6 4.7K 5%
32
PART CODE
3515600100 CN6XB-102M CEXF1C101V CEXF1E102V 3519150520 3519150510 441M367160 DZN4148--DZN4004A-DZTZ5R1B-DZTZ3R9B-DDDG631H-3514315410 RA-87X104J RD-AZ331JRD-AZ102JRD-AZ104JRD-AZ101JRD-AZ103JRD-AZ105JRD-4Z510J1MC7905C-TZRA106M-TZTA1270Y5EPU035302 85801052GY 85801052GY 13GS1A1GH0 5PKBR40MKS 5SC0101121 5SC0101404 CCZB1H102K CCZF1H104Z RD-AZ472J
Q'TY
1 1 1 1 1 1 1 11 2 1 1 1 1 1 7 5 3 1 4 1 1 1 8 1 1 21 2 1 1 1 1 1 5 1
R11,20,21 R13 R15~17,R9 R18 R19 VL1 Q1~5,9~11 Q6 LVT1 J1-J21 SJ3,5 IC1 CR1 RY1 RY2 C6 C1,C3~5,C7 R23
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
33
EXPLODED VIEW AND PARTS LIST
REF. NO A00 B00 F01 F02 F03 F04 F05 F06 F07 F08 F09 F10 F11 F12 F13 F14 F15 F16 F17 F18 F19 F20 F21 F22 F23 F24 F25 F26 F27 F28 F29 F30 F31 F32 F33 F34 F35 F36 F37
PART CODE 3511713500 3516724060 3510803100 3516004100 3516111500 3516111600 7122401211 7122401211 7112401011 35113TCN35 4413A90012 7122401211 7121403011 3518605800 7121403011 3963822000 3963822200 3512520000 3511800100 3518003200 3516003800 7272100811 3513003200 3518302200 3518400400 3518116740 3516003700 3510313400 7112401011 3512100900 7272400811 3515202800 3512717420 4415A17352 4415A66600 3518571000 3513701300 3513814300 3513601500 7121400611 3966820200
PART NAME DOOR AS CONTROL-PANEL AS CABINET SPECIAL SCREW CAVITY AS CAVITY JOINT AS SCREW TAPPING SCREW TAPPING SCREW TAPPING CORD POWER AS CLAMP POWER CORD SCREW TAPPING FUSE HOLDER FUSE SCREW TAPPING MOTOR SHADED POLE MOTOR SHADED POLE GUIDE WIND FAN MAGNETRON SPECIAL SCREW SCREW TAPTITE HOLDER HV CAPACITOR CAPACITOR HV DIODE HV TRANS HV SPECIAL SCREW BASE SCREW TAPPING FOOT SCREW TAPTITE STOPPER HINGE *U AS HARNESS MAIN SW MICRO SW MICRO SW MICRO LEVER LOCK LOCK LAMP SCREW TAPPING MOTOR SYNCRO
DESCRIPTION KOR-131G0A KOR-131G2A PCM T0.6 T1 TRS LR4 POLE 4*10 SE MFZN KOR-131G0A KOR-131G0A T2S TRS 4*12 MFZN T2S TRS 4*12 MFZN T1 TRS 4*10 MFZN 3X16AWG 40X40 120-RTMI NYLON66 T2S TRS 4*12 MFZN 65TS 125V 20A NYLON66 T2S TRS 4*30 MFZN 120V 30W MW15XA-K01 120V 30W OEM-15DWX1-B07 PP PP GF20 2M218J(MF) P T2 FLANGE 5X8 MFZN TT3 TRS 4X8 MFZN SECC T0.6 2100VAC 0.98uF #187 HR-1X-3AB 12KV #187 DW-N11A0-13T TT3 HEX 4X8 FLG MFZN SBHG T0.7 T1 TRS 4X10 MFZN PP DASF-130 TT3 TRS 4X8 MFZN KOR -121M0A KOR-131G2A VP-533A-OF SPNO #187 200G VP-532A-OF SPNC #187 200G MP101C POM POM BLACK BL 125V 25W T25 C5A H187 T2S PAN 4X6 MFZN 120V 2W GM-16-12F17
Q'TY 1 1 1 3 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 4 1 5 2 1 1 1 1 1 1 1 1 1 1 1
34
EXPLODED VIEW AND PARTS LIST
REF. NO F38 F39 F40 F41 F42 F43 F44 F45
PART CODE 3518905300 3513003400 7272400811 3511406200 3517400620 3514701501 3512519300 441X335A10
PART NAME THERMOSTAT HOLDER THERMOSTAT SPECIAL TAPTITE COVER WAVE GUIDE COUPLER ROLLER GUIDE ROLLER TRAY PBT
DESCRIPTION OFF:75 ON:65 H#187 NB TT3 TRS 4X8 MFZN HEATPROOF PP XAREC TEFLON D:14.5 PP 5113MF6 A353R BORO-S1 GLASS(NFG)
Q'TY 1 1 2 1 1 3 1 1
35