DAEWOO ELECTRONICS KOR-178HS, Service Manual

Page 1: ...OR164H9001 KOR 178HS 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: ...d 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 PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCES...

Page 3: ...n 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 ...

Page 4: ...EQUENCY 2450 MHz OUTSIDE DIMENSIONS W X H X D 589x339x461 mm 23 2x13 3x18 2 in CAVITY DIMENSIONS W X H X D 399x263x426 mm 15 7x10 4x16 8 in NET WEIGHT APPROX 17 0kg 37 5 lbs TIMER 99 min 99 sec FUNCTION SELECTIONS MICROWAVE POWER SELECTIONS 10 LEVELS CAVITY VOLUME 1 6 Cu Ft Specifications are subject to change without notice EXTERNAL VIEW 1 OUTER DIMENSION 339 589 461 KOR 178HW KOR 178HS ...

Page 5: ...de cover Protects the microwave outlet from splashes of cooking foods 6 6 Oven lamp Automatically turns on during oven operating 7 7 Safety interlock system 8 8 Control panel 9 9 Door open button To open the door push the door open button 0 0 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 q q...

Page 6: ...ntities of food 4 Auto Cook Used to reheat or cook many of favorite foods 5 Auto Defrost Used to defrost foods for weight 6 Power Used to set power level 7 Clock Used to set clock 8 Stop Clear Used to stop the oven operation or to delete the cooking data 9 Start Speedy Cook Used to start the oven and also used to set a reheat time KOR 178HW KOR 178HS 2 2 5 5 6 6 7 7 9 9 3 3 1 1 4 4 8 8 ...

Page 7: ...7Volts KOR 167H9A27 168H9A27 60Hz grounded outlet Line fuse rating is 20amperes and described on EXPLODED VIEW AND PART LIST Power supply cord is about 1 0 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 ...

Page 8: ...ed 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 seal for obstructions and make sure the door is clos...

Page 9: ...e 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 blow...

Page 10: ...ard 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 11: ... 5 Remove the spring hook and the hook from the door painting assembly 6 Reverse the above steps for reassembly A01 3512210900 FRAME DOOR KOR 168H9A27 SILICON 1 A02 3515204400 STOPPER HINGE T AS KOR 162J0A 1 A03 3511710500 DOOR PAINTING AS KOR 161H0A 1 A04 3517005200 BARRIER SCREEN I PE T1 0 1 A05 3512301800 GASKET DOOR PP 5113MF6 1 A06 3513100900 HOOK POM 1 A07 3515101900 SPRING PW 1 1 REF NO PAR...

Page 12: ... 5 Remove the spring hook and the hook from the door painting assembly 6 Reverse the above steps for reassembly A01 3512210910 FRAME DOOR KOR 168H9A52 SILICON 1 A02 3515204400 STOPPER HINGE T AS KOR 162J0A 1 A03 3511710500 DOOR PAINTING AS KOR 161H0A 1 A04 3517005200 BARRIER SCREEN I PE T0 1 1 A05 3512301800 GASKET DOOR PP 5113MF6 1 A06 3513100900 HOOK POM 1 A07 3515101900 SPRING PW 1 1 REF NO PAR...

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

Page 14: ...and button door open from the control panel 6 Reverse the above steps for reassembly B01 3511618320 DECORATOR BUTTON ABS SG 0760D SG 175 COATING 1 B02 3516915960 BUTTON DOOR OPEN ABS SG 0760D SG 175 1 B03 441G430171 SPRING BUTTON SWP DIA 0 7 1 B04 3518573310 SWITCH MEMBRANE KOR 168H9A27 1 B05 3516738400 CONTROL PANEL ABS SG 0760D SG 175 1 B06 3513702800 LEVER DOOR OPEN PP 1 B07 PKMPMSZZ20 PCB MAIN...

Page 15: ...tton door open from the control panel 6 Reverse the above steps for reassembly B01 3511618320 DECORATOR BUTTON ABS SG 0760D SG 175 COATING 1 B02 3516915970 BUTTON DOOR OPEN ABS SG 0760D SG 175 SPRAY 1 B03 441G430171 SPRING BUTTON SWP DIA 0 7 1 B04 3518573310 SWITCH MEMBRANE KOR 168H9A27 1 B05 3516738420 CONTROL PANEL ABS SG 0760D SG 175 SPRAY 1 B06 3513702800 LEVER DOOR OPEN PP 1 B07 PKMPMSZZ20 PC...

Page 16: ... for a fully assembled oven with door normally closed 6 To remove high voltage capacitor 1 Remove the 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 reassembly High voltage circuit wiring 7 To remove magnetron 1 Remove the screw which secure the magnetron 2 Remove the magnetron ...

Page 17: ...e 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 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 ...

Page 18: ...ever 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 3 Adjustment steps a Loosen the one mounting screw b Adjust interlock switch assembly position Actuation distance of primary and secondary interlock switch shall be adjusted almost 0mm c Make sure that lock lever moves smoot...

Page 19: ...n of 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 of primary interlock switch contact with door partially open until interlock monitor switch contact close Malfunction of interlock monitor switch Shorted contacts of primary interlock switch RESULT Continuity No Continuity No Contin...

Page 20: ...ontinuity Adjust or Replace Check D C voltage being supplied 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 not shown countdown Malfunction of secondary interlock switch Replace Check continuity of power supply cord Open power supply cord No Continuity Replace Defective touch control circuit Normal Repl...

Page 21: ...r 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 0 Ωor Defective high voltage transformer Replace Check continuity of magnetron with wires removed No Continuity Defective magnetron Replace Check continuity of filament terminal of high voltage transformer No Conti...

Page 22: ...y jumps in time while counting down 9 Display counts down noticeable too fast while cooking 10 Display does not show the time of day when the STOP 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 NOTE Before following the particular steps listed above in the trouble sho...

Page 23: ...he 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 sel...

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 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 ...

Page 25: ...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 Ωin the other direction 4 Magnetron For complete magnetron diagnosis refer to Measurement of the Microwave Power Output Continuity check...

Page 26: ...25 KOR 187H WIRING DIAGRAM ...

Page 27: ... changes in proportion to fluctuation of power source voltage 3 The allowable tolerance of the secondary voltage is within 5 of nominal voltage NOTE Each measure point must be measured with GND points Terminal Voltage 5 6 7 LOAD AC 12 6 V NO LOAD AC 14 7 V NO CHECK POINT REMARK 1 IC1 PIN 5 5VDC 2 IC1 PIN 8 3 IC1 PIN 35 OR PIN 36 T 16 67ms 60Hz T 250 ns 4MHz NO MEASURE POINT WAVE FORM REMEDY REMARK...

Page 28: ...27 Measurement point MP1 MP2 GND ...

Page 29: ...igital clock does not operate properly refer to Circuit Diagram If clock does not keep exact time you must check resistor R20 and zener diode ZD2 STATE POINT A B RELAY 2 ON 5VDC GND RELAY 2 OFF GND 15VDC STATE POINT A B RELAY 1 ON 5VDC GND RELAY 1 OFF GND 15VDC STATE POINT A B 1 DOOR OPEN OPEN 5VDC 2 DOOR CLOSED CLOSE GND CHECK NO METHOD REMEDY 1 Check the stage ON OFF of the door open monitor swi...

Page 30: ...29 KOR 178H ...

Page 31: ...10 12 17 18 22 1 6W 1K 5 RD AZ102J 6 18 RESISTOR R13 R19 20 1 6W 10K 5 RD AZ103J 3 19 RESISTOR R9 1 6W 100K 5 RD AZ104J 1 20 RESISTOR R11 1 6W 200 5 RD AZ201J 1 21 RESISTOR R14 1 6W 1M 5 RD AZ105J 1 22 RESISTOR R21 1 4W 51 5 RD 4Z510J 1 23 RESONATOR CERA CR1 CRT 4 00MS 5P4R00MTS 1 24 IC REGULATOR VL1 MC7805C 1CPMC7805C 1 25 TRANSISTOR Q1 5 KRA106M TZRA106M 5 26 TRANSISTOR Q9 11 KRC106M TZRC106M 3 ...

Page 32: ...2 KOR 168H9A27 KOR 168H9A52 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 KOR 178HW KOR 178HS ...

Page 33: ...20 3518400400 DIODE HV HVR 1X 3AB 12KV 187 1 F21 3518114530 TRANS HV DWAR10A0 16T S 1 F22 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 4 F23 3510311800 BASE SBHG T0 8 1 F24 7112401011 SCREW TAPPING T1 TRS 4 10 MFZN 5 F25 3512101400 FOOT DASF 310 4 F26 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 1 F27 3515204500 STOPPER HINGE U AS KOR 162J0A 1 F28 3512714601 HARNESS MAIN KOR 161H0A 1 F29 4415A17352 ...

Page 34: ...3518400400 DIODE HV HVR 1X 3AB 12KV 187 1 F21 3518114530 TRANS HV DWAR10A0 16T S 1 F22 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 4 F23 3510311800 BASE SBHG T0 8 1 F24 7112401011 SCREW TAPPING T1 TRS 4 10 MFZN 5 F25 3512101400 FOOT DASF 310 4 F26 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 1 F27 3515204500 STOPPER HINGE U AS KOR 162J0A 1 F28 3512714601 HARNESS MAIN KOR 161H0A 1 F29 4415A17352 SW ...

Page 35: ...S M NO R161G0A001 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 Jul 2009 ...