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Daewoo KOT-170S0A, Service Manual, Page: 52 / 70

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51

(TROUBLE 2) Digital readout display does not show programming, even if the membrane keyboard is programmed by

touching proper pads.

MEMBRANE KEYBOARD CHECK PROCEDURE
1. Check the pad termination order and nomenclature

NOTE : 

Before following the particular steps listed above in the trouble shooting guide for the membrane keyboard, fail-
ure, please check for the continuity of each wire-harness between the membrane keyboard and control box
assembly.

KOT-170S0A/KOT-174S0A/KOT-175S0A

KOT-170U0A

Summary of Contents for KOT-170S0A

Page 1: ...Service Manual Microwave Oven Model KOT 170U0A KOT 170S0A KOT 174S0A KOT 175S0A DAEWOO ELECTRONICS CO LTD S M No T170U0A002 http svc dwe co kr Mar 2002...

Page 2: ...crowave gen erating compartments check the magnetron wave guide or transmission line and cavity for proper align ment integrity and connections d Any defective or misadjusted components in the interlo...

Page 3: ...ken door hinge 2 A broken door viewing screen 3 A broken front panel oven cavity 4 A loosened door lock 5 A broken door lock The door gasket plate and oven cavity surface should be kept clean No greas...

Page 4: ...cooling Forced air Microwave Distribution turntable Rectification voltage doubler half wave Door Sealing Choke System Safety Device Cavity Thermostat open 212 100 reset 32 0 Bottom Thermostat open 194...

Page 5: ...4 EXTERNAL VIEW REFER TO THE INSTALLATION GUIDE INSTALLATION REFER TO THE INSTALLATION GUIDE OPERATIONS AND FUNCTIONS REFER TO THE INSTALLATION GUIDE...

Page 6: ...t the electric charge in the higi voltage capacitor for about 30 seconds after the operation has stopped an electric charge remains in the high voltage capacitor When replacing or checking parts short...

Page 7: ...to the section for the component you wish to service CABINET INSTALLATION Refer to FIG 1 for the following steps 1 Position the cabinet over the top of the microwave oven and slide the power cord all...

Page 8: ...7 FIG 1...

Page 9: ...tor 3 Remove the screw from the top center tab of the control panel 4 From the top and back of the control panel lift the top locking tab and pull the top of the panel out slightly then lift the botto...

Page 10: ...or lint 7 Mount the new control circuit board to the mounting bracket with 4 screws 8 Plug the following connectors over their control circuit board plugs so that they lock into place a 2 Pin connect...

Page 11: ...ket and mount the new socket in its place 5 Reinstall the cavity lamp cover into its air guide top 6 Mount the vent grille to the microwave oven and check out the operation If the socket holding snap...

Page 12: ...and back of the control panel pull out the Fuse Holder 5 Without touching the metal ends remove the defective line fuse from its holder and install a new one in it s place 6 Mount the control panel t...

Page 13: ...vent motor capacstor terminals as shown in the FIG 6 6 Reinstall the vent motor capacitor in its place carefuley 7 Reinstall the control panel wire protector and the vent grille on the microwave oven...

Page 14: ...e you work Refer to FIG 7 for the following steps 6 Remove the mounting screw from the interlock switch assembly and position the assembly so you can easily access the switches and wiring 7 Refer to R...

Page 15: ...he microwave oven and check out the operation of the switches WARNING The interlock Monitor Switch provides an added safety check on the Primary and Secondary Interlock Switches If the Primary and Sec...

Page 16: ...Remove the mounting screw from the bottom thermostat and lift the bottom flange out at slot in the chassis See FIG 8 7 Unplug the two wire connectors from the bottom thermostat 8 Connect the two wires...

Page 17: ...tor to the oven with its the screws 6 Connect the wires to the tray motor terminal 7 Reinstall the base plate in the oven 8 Secure its 4 screws WARNING Personal Injury Hazard Disconnect from the elect...

Page 18: ...he orange and brown wires over the light socket terminals 5 Mount the base plate to the microwave oven WARNING Personal Injury Hazard Disconnect from the electrical supply before servicing the unit Fa...

Page 19: ...njury Hazard Disconnect from the electrical supply before servicing the unit Failure to do so could result in electrical shock or other personal injury CAUTION Personal Injury Hazard Because of the we...

Page 20: ...sket along the edges of the door with a putty knife 3 Install the new gasket so that it fits tightly into place inside the door WARNING Personal Injury Hazard Disconnect from the electrical supply bef...

Page 21: ...mostat See FIG 13 2 7 Install the new cavity thermostat and reinstall the air guide top vent motor cabinet wire protector and vent grille on the microwave oven WARNING Personal Injury Hazard Disconnec...

Page 22: ...21 FIG 13 1 FIG 13 2...

Page 23: ...motor See FIG 14 4 Unplug the wire connectors for vent motor 5 Connect the wire connector and secure the vent motor 6 Install the new vent motor 7 Reinstall the vent motor cover and remount the oven C...

Page 24: ...or housing with the two mounting screws 8 Slide the fan blade 9 Connect the fan motor wires to the fan motor terminals Reassembly 1 Connect the wiring to the control panel circuit board and then mount...

Page 25: ...ns lock together 8 Route the gree wire under the cover and mount the eyelet to the chassis with the screw you removed earlier 9 Refer to Cabinet Installation and reinstall the cabinet and the vent gri...

Page 26: ...supply before servicing the unit Failure to do so could result in electrical shock or other personal injury CAUTION Personal Injury Hazard Because of the weight and size of the microwave oven two peo...

Page 27: ...steps 5 Unplug the five high voltage transformer wire connectors and remove high voltage transformer 6 Mount the new high voltage transformer to the plate with 4 mounting screws you removed earlier 7...

Page 28: ...d of the high voltage rectifier lead to the bracket with its mounting screw FIG 18 WARNING Personal Injury Hazard Disconnect from the electrical supply before servicing the unit Failure to do so could...

Page 29: ...emove the old capacitor WARNING Personal Injury Hazard Disconnect from the electrical supply before servicing the unit Failure to do so could result in electrical shock or other personal injury CAUTIO...

Page 30: ...the front end of the capacitor and tighten the screw just enough to hold the capacitor in place 8 Connect the end of the high voltage rectifier and red wire coming from the high voltage transformer to...

Page 31: ...Support the magnetron with one hand while you remove the screws with the other so that the magnetron does not fall as you remove it FIG 20 WARNING Personal Injury Hazard Disconnect from the electrical...

Page 32: ...to the top of the chassis with its four mounting hex unts Make sure that you tighten the nuts securely 11 Connect the red high voltage leads to the magnetron terminals 12 Refer to Cabinet Installation...

Page 33: ...ect operation described in users guide manual instruction man ual by time cooking in order to find the exact cause of any trouble TROUBLE 1 Oven does not operate at all any input can not be accepted C...

Page 34: ...uity Adjust or replace Check D C voltage being sup plied to RELAY RY2 coil Defective touch control circuit 0 V Replace Faulty contacts of RELAY RY2 or open relay coil Approx 15 VDC Replace Display do...

Page 35: ...ter of approximately 190 mm 3 The oven and the empty vessel are at ambient temperature prior to the start of the test The initial temperature of the water is 10 2 C 50 3 6 F It is measured immediately...

Page 36: ...air vent EQUIPMENT Electromagnetic energy leakage monitor NARDA 8100B HOLADAYH1501 600 cc glass beaker Glass thermometer 100 C or 212 F When checking for R F leakage use an approved R F measuring devi...

Page 37: ...ces faster than 1 inch per second 2 5 cm sec otherwise a false reading will occur When testing near a corner of the door keep the probe perpendicular to the surface and move it horizontally without to...

Page 38: ...l cut out The cavity thermal cut out is located air guide top This thermal cut out is normally closed and will open at a set temperature to disable the oven The bottom thermal cut out is located direc...

Page 39: ...viced for any reason NOTE Replace the magnetron if the checks and all of the high voltage component tests are good but the unit still does not heat a load 1 Set the ohmmeter to the Rx1 scale and measu...

Page 40: ...lly close N C and the common C terminals of the switch Set the ohmmeter to the R x 1 scale and measure across the terminals Set the ohmmeter to the R x 1 scale and measure the a High speed windings bl...

Page 41: ...t the ohmmeter to the Rx1 scale and measure forward resistance across the rectifier termi nals with the lead touching the anode and the lead touching the cathode a Normal The meter indicates several o...

Page 42: ...41 WIRING DIAGRAM 1 WIRING DIAGRAM...

Page 43: ...wing the air coming from the intake on the rear plate hole 3 The oven lamp light the inside of the oven 4 Indicator light turns on to indicate function operation Cooking time starts count down 5 3 3 V...

Page 44: ...en auto defrost is selected and the desired defrosting time is chosen the automatic cycle divides the defrosting time into 5 periods of alternating defrost and stand times by cycling on and off 4 When...

Page 45: ...hen the CANCEL OFF pad is touched during cooking 1 The touch control circuit the voltage supplied to the RELAY 1 coil and causes the magnetron to stop oscillating 2 RELAY 5 and 6 turns off 3 The displ...

Page 46: ...changes in proportion to fluctuation of power source voltage NOTE The allowable tolerance of the secondary voltage is within 5 of normal voltage NOTE Each measure point must be measured with GND point...

Page 47: ...oesn t come on from G1 to G7 SEGMENT d doesn t come on from G1 to G7 SEGMENT e doesn t come on from G1 to G7 SEGMENT f doesn t come on from G1 to G7 SEGMENT g doesn t come on from G1 to G7 SEGMENT h d...

Page 48: ...r in display comes on Cause RELAY 6 does not operate CHECK METHOD When touching START pad oven lamp turns on Fan motor and turntable rotate and cook indicator in display comes on Cause RELAY 1 does no...

Page 49: ...ly CHECK METHOD If clock does not keep exact time you must check resistor R20 transistor Q6 STAGE POINT 1 DOOR OPEN 2 DOOR CLOSED A OPEN CLOSED B 5VDC GND CHECK NO A B 1 Check the stage ON OFF of the...

Page 50: ...ing checking point A B C D after 1 2 minutes R 6 10 connecting status of humidity sensor must be checked before checking point A B C D NO 1 2 3 4 CHECK POINT A B C D REMARK 0 5V VALUE 3 5V 11 3Vdc 4 4...

Page 51: ...sembly 1 Incomplete segments A Segments missing B Partial segments missing C Digit flickering other than normal fluorescent slight flickering D TOUCH CLOCK PAD TO ENTER TIME OF DAY does not disply whe...

Page 52: ...OARD CHECK PROCEDURE 1 Check the pad termination order and nomenclature NOTE Before following the particular steps listed above in the trouble shooting guide for the membrane keyboard fail ure please...

Page 53: ...Between A and H 2 1 pad Between B and H 3 2 pad Between C and H 4 3 pad Between D and H 5 4 pad Between E and H 6 5 pad Between F and H 7 6 pad Between G and H 8 7 pad Between A and I 9 8 pad Between...

Page 54: ...TABLE ON OFF pad Between C and K 25 CLOCK AUTO START pad Between D and K 26 AUTO DEFROST pad Between E and K 27 COOK TIME pad Between F and K 28 POWER LEVEL MORE LESS pad Between G and K 29 LIGHT pad...

Page 55: ...54 2 COMPONENT INFORMATION 1 TRANSISTOR 2 DIODE AND ZENER DIODE 2 COMPONENT INFORMATION 1 TRANSISTOR...

Page 56: ...55 3 PRINTED CIRCUIT BOARD FILM MP1 MP3 MP2...

Page 57: ...56...

Page 58: ...57 4 PCB CIRCUIT DIAGRAM...

Page 59: ...ZENER ZD2 UZ 4 7BSB DZUZ4R7BSB 1 KOT 170S 20 DIODE ZENER ZD3 UZ 24BSB DZUZ24BSB 1 21 DIODE ZENER ZD4 UZ 5 6BSB DZUZ5R6BSB 1 22 DIODE ZENER ZD5 UZ 13BSA DZUZ13BSA 1 23 DIODE ZENER ZD6 UZ 3 9BSB DZUZ3R...

Page 60: ...ARRAY RA1 6P 5 1 8 100K 5 RA 86X104J 1 52 RESONATOR CERAMIC CR1 CRT4 00MS 5P4R00MTS 1 53 SW RELAY RY1 G5G 1ADT DC 24V 5SC0101124 1 54 SW RELAY RY2 RY6 CSII 24SH 1C 1P 5SC0101129 5 55 SW RELAY RY7 KM1...

Page 61: ...1 BISQUE WHITE 3517007200 BLACK A02 BARRIER SCREEN O TEMP GLASS T3 2 3517007210 1 BISQUE WHITE BLACK A03 HANCLE DOOR I PC 3512603900 1 BISQUE WHITE BLACK A04 DOOR PAINTING AS KOT 150S0A 3511712300 1 B...

Page 62: ...3517007220 1 BLACK A03 HANDLE DOOR I PC 3512603900 1 BLACK A04 DOOR PAINTING AS KOT 150S0A 3511712300 1 BLACK A05 HOOK POM 3513101200 1 A06 SPRING HOOK PW1 3515101800 1 A07 SCREW TAPPING T2S TRS 4X12...

Page 63: ...RTER HANDLE PC 3515307910 1 BISQUE WHITE BLACK A04 DOOR PAINTING AS KOT 150S0A 3511712300 1 BISQUE WHITE A05 HOOK POM 3513101200 1 A06 SPRING HOOK PW1 3515101800 1 A07 SCREW TAPPING T2S TRS 4X16 MFZN...

Page 64: ...1 BISQUE WHITE B00 SWITCH MEMBRANE BLACK KOT 170S0A 3518522610 1 BISQUE WHITE KOT 174S0A 3518522610 1 BLACK BLACK B01 CONTROL PANEL PC 3516725900 1 BISQUE WHITE B02 BACK PLATE SECC T0 6 3516802110 1...

Page 65: ...ACK B00 SWITCH MEMBRANE KOT 175S0A 3518522620 1 BISQUE WHITE B01 DECORATOR C PANEL STS430 T0 5 3511609200 1 BLACK B02 CONTROL PANEL PC 3516722730 1 BISQUE WHITE B03 BACK PLATE SECC T0 6 3516802110 1 K...

Page 66: ...65 3 TOTAL ASSEMBLY...

Page 67: ...AIR AL 3511900200 2 F04 SCREW TAPPING TI TRS 4X10 MFZN BK 7112401012 1 F05 BRACKET LAMP COVER SECC T0 5 M GY 3510605000 1 F06 FOAM UR 5TX10X60 3517303300 1 F07 COVER LAMP GLASS T3 0 3511405500 1 BLACK...

Page 68: ...10D0 1 MONITOR F36 SW MICRO VP533A 0FR 5S762G10D0 1 PRIMARY F37 LEVER SW MICRO POM 3513702100 1 F38 SCREW TAPPING T2S TRS 4X12 MFZN 7122401211 1 F39 SCREW TAPPING T2S PAN 3X6 MFZN 7121300611 2 F40 THE...

Page 69: ...2 F65 THERMOSTAT OFF 100 ON 0 V 187 3518904800 1 F66 FAN PP GF20 3511800100 1 F67 CAPACITOR RUNNING 250VAC 10 0UF 3518303300 1 F68 GUIDE AIR T PP TB53 8512521500 1 F69 MOTOR SHADED POLE 120V 60HZ MW1...

Page 70: ...S M NO T170U0A002 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 Mar 2002...

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