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Service Manual
Microwave Oven
Model: KOG-372G0S
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).
DAEWOO ELECTRONICS CO., LTD.
S/M No. : G372GH0S02
KOG-372H0S
KOG-392G0S
KOG-392H0S
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Summary of Contents for Daewoo KOG-372GOS
- Page 1 : 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). DAEWOO ELECTRONICS CO., LTD.
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Page 2: Table Of Contents
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 w ith the door open. (b) M ake the following safety checks on all ovens to be serviced before activating the m agnetron or other m icrowave source, and m ake repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other dam age), (4) Dam age to or loosening of hinges and latches, (5) Evidence of dropping or abuse. -
Page 3: Safety And Precautions
SAFETY AND PRECAUTIONS 1. FOR SAFE OPERATION D am age that allow s the m icrow ave energy (that cooks or heats the food) to escape w ill result in poor cooking and m ay cause serious bodily injury to the operator. IF A N Y O F TH E FOLLO W IN G CO N D ITIO N S E X IS T, O P E RATO R M U S T N O T US E TH E A P P LIA N C E . -
Page 4: Specifications
SPECIFICATIONS M O D EL K O G -372G /H KO G -392G /H PO W E R SU P PLY 230V -50H z, SIN G LE PH AS E W ITH E AR TH IN G M IC R O W AVE 1200W 1350W PO W E R... -
Page 5: External View
EXTERNAL VIEW 1. OUTER DIMENSION... -
Page 6: Feature Diagram
EXTERNAL VIEW 2. FEATURE DIAGRAM 1. DOOR SEAL - Door seal m aintains the m icrowave energy within the oven cavity and prevents m icrowave leakage. 2. REFLECTOR (Insulator Heater) 3. HEATING ELEMENT 4. OVEN CAVITY 5. SEFETY INTERLOCK SYSTEM 6. -
Page 7: Control Panel
EXTERNAL VIEW 3. CONTROL PANEL (1) KOG-372G0S/392G0S 1. TIME SET PAD - Used to set the cooking tim e and the present tim e. 2. DISPLAY - Cooking tim e, power level, indicators and present tim e are displayed. 3. ONE TOUCH - Used to cook or reheat specific quantities of food. 4. - Page 8 EXTERNAL VIEW (2) KOG-372H0S/392H0S 1. TIME SET PAD - Used to set the cooking tim e and the present tim e. 2. DISPLAY - Cooking tim e, power level, indicators and present tim e are displayed. 3. ONE TOUCH- Used to cook or reheat specific quantities of food. 4.
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Page 9: Installation
INSTALLATION 1. Steady, flat location This m icrow ave oven should be set on a steady, flat surface. This m icrow ave oven is designed for counter top use only. 2. Leave space behind and side A ll air vents should be kept a clearance. If all vents are covered during operation, the oven m ay overheat and, eventually, cause failure. -
Page 10: Operations And Functions
OPERATIONS AND FUNCTIONS 1. Connect the m ain lead to an electrical outlet. 2. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray m ust always be in place during cooking. 3. -
Page 11: Disassembly And Assembly
DISASSEMBLY AND ASSEMBLY Cautions to be observed when trouble shooting Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. It is completely safety during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit. You are asked to observe the following precautions carefully. - Page 12 DISASSEMBLY AND ASSEMBLY 1. To remove cabinet 1) Rem ove three screws on cabinet back. 2) Push the cabinet backward. 2. To remove door assem bly 1) Rem ove a screw which secure the stopper hinge top. 2) Rem ove the door assem bly from top plate of cavity. 3) Reverse the above for reassem bly.
- Page 13 Caution: In this Service 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) DISASSEMBLY AND ASSEMBLY 3.
- Page 14 DISASSEM BLY AND ASSEM BLY 1) Rem ove the gasket door from door plate. 2) Rem ove the barrier screen inner from door plate. 3) Rem ove the door fram e from door plate. 4) Rem ove the stopper hinge top from door plate. 5) Rem ove the spring and the hook.
- Page 15 Caution: In this Service 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) DISASSEMBLY AND ASSEMBLY 5.
- Page 16 DISASSEMBLY AND ASSEMBLY 1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assem bly. 2) Rem ove four screws which secure the PCB assem bly to control panel. 3) Disconnect m em brane tail from the connector of the PCB assem bly. 4) Detach m em brane from the control panel.
- Page 17 DISASSEMBLY AND ASSEMBLY 8. To remove wind guide assembly. 1) Rem ove a screw for earthing. 2) Rem ove the noise filter from the wind guide. 3) Rem ove a screw which secure the wind guide assem bly. 4) Draw forward the wind guide assem bly. 5) Pull the fan from the m otor shaft.
- Page 18 DISASSEMBLY AND ASSEMBLY 10. To remove tray motor. (1) Remove the coupler in the cavity. (2) Turn the set upside down. (3) Cut the tray motor cover 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.
- Page 19 Caution: In this Service 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) DISASSEMBLY AND ASSEMBLY 12.
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Page 20: Interlock Mechanism And Adjustment
INTERLOCK MECHANISM AND ADJUSTMENT The door lock m echanism is a device which has been specially designed to com pletely elim inate m icrowave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave. (1) Prim ary interlock switch W hen the door is closed, the hook locks the oven door. -
Page 21: Trouble Shooting Guide
TROUBLE SHOOTING GUIDE Following the procedure below to check if the oven is defective or not. 1) Check earthing before trouble checking. 2) Be careful of the high voltage circuit. 3) Discharge the high voltage capacitor. 4) W hen checking the continuity of the switches, fuse or high voltage transform er, disconnect one lead wire from these parts and check continuity with the AC plug removed. - Page 22 TROUBLE SHOOTING GUIDE CON DITION CHECK RESULT CAUSE REM EDY R eplace C heck con tinuity of D efective O utlet has m agn etron C ontinuity m agn etron proper voltage Fuse does not blow. C heck con tinuity of R eplace D efective line noise filter board...
- Page 23 TROUBLE SHOOTING GUIDE ( TROUBLE 3 ) No m icrowave oscillation even though fan m otor rotates. C ON DITIO N C HE C K R ES U LT C AU S E R EM ED Y N o C ontinuity N o m icrow ave C heck continuity of high oscillation...
- Page 24 TROUBLE SHOOTING GUIDE ( TROUBLE 4 ) The following visual conditions indicate a probable defective touch control circuit or m em brane switch assem bly 1. Incom plete segm ents, 1) Segm ents m issing. 2) Partical segm ents m issing. 3) Digit flickering other than norm al display slight flickering.
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Page 25: Measurement And Test
MEASUREMENT AND TEST 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT M icrowave output power can be checked by indirectly m easuring the tem perature rise of a certain am ount of water exposed to the m icrowave as directed below. PROCEDURE 1. -
Page 26: Microwave Radiation Test
MEASUREMENT AND TEST 2. MICROWAVE RADIATION TEST CAUTION 1. M ake sure to check the m icrowave leakage before and after repair of adjustm ent. 2. Always start m easuring of an unknown field to assure safety for operating personnel from m icrowave energy. 3. -
Page 27: Component Test Procedure
MEASUREMENT AND TEST 3. COMPONENT TEST PROCEDURE High voltage is present at the high voltage term inal of the high voltage transform er during any cooking cycle. It is neither necessary nor advisable to attem pt m easurem ent of the high voltage. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor. -
Page 28: Wiring Diagram
WIRING DIAGRAM... -
Page 29: Printed Circuit Board
PRINTED CIRCUIT BOARD 1. CIRCUIT CHECK PROCEDURE 1. Low voltage transformer check The low voltage transform er is located on the P.C.B. M easuring condition: Input voltage: 230 V / Frequency: 50Hz Term inal Voltage LO AD N O LO A D 4 - 7 A C 12.6 V A C 14.7 V... - Page 30 PRINTED CIRCUIT BOARD M P1 M P2 Measure Point...
- Page 31 PRINTED CIRCUIT BOARD 3. W hen there is no microwave oscillation 1) W hen touching START pad, oven lam p does not turn on. Fan m otor do not rotate, but cook indicator in display com es on. Cause : RELAY 2 does not operate. refer to Circuit Diagram ( Point 3) - Check m ethod P OINT STATE...
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Page 32: Pcb Circuit Diagram
PRINTED CIRCUIT BOARD 2. P.C.B. CIRCUIT DIAGRAM... -
Page 33: Location No
Caution: In this Service 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) PRINTED CIRCUIT BOARD 3. - Page 34 Caution: In this Service 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) PRINTED CIRCUIT BOARD (2) KOG-392G0S/392HOS NAM E SYM BOL...
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Page 35: Exploded View And Parts List
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 F39-1... - Page 36 Caution: In this Service 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) EXPLODED VIEW AND PARTS LIST REF NO PART CODE PART NAME...
- Page 37 Caution: In this Service 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) EXPLODED VIEW AND PARTS LIST REF NO PART CODE PART NAME...
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