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S/M No. : G371G0S001
Service Manual
Microwave Oven
Model: KOG-371G0S
KOG-371H0S
KOG-391G0S
KOG-391H0S
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 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.
(c) Before turning on power to the m icrow ave oven for any service test or inspection within the m icrowave
generating com partm ents, check the m agnetron, wave guide or transm ission line, and cavity for proper
alignm ent, integrity, and connections.
(d) Any defective or m isadjusted com ponents in the interlock, m onitor, door seal, and m icrowave generation and
transm ission system s shall be repaired, replaced, or adjusted by procedures described in this m anual before the
oven is released to the owner.
(e) A m icrowave leakage check to verify com pliance with the Federal perform ance standard should be perform ed on
each oven prior to release to the owner.
SAFETY AND PRECAUTIONS ........................................................................................................... 2
1. FOR SAFE OPERATION .............................................................................................................. 2
2. FOR SAFE SERVICE PROCEDURES ......................................................................................... 2
SPECIFICATIONS ............................................................................................................................... 3
EXTERNAL VIEW................................................................................................................................ 4
1. OUTER DIMENSION..................................................................................................................... 4
2. FEATURE DIAGRAM .................................................................................................................... 5
3. CONTROL PANEL ........................................................................................................................ 6
INSTALLATION .................................................................................................................................. 8
OPERATIONS AND FUNCTIONS....................................................................................................... 9
DISASSEMBLY AND ASSEMBLY...................................................................................................... 10
INTERLOCK MECHANISM AND ADJUSTMENT............................................................................... 19
TROUBLE SHOOTING GUIDE ........................................................................................................... 20
MEASUREMENT AND TEST .............................................................................................................. 24
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ...................................................... 24
2. MICROWAVE RADIATION TEST ................................................................................................. 25
3. COMPONENT TEST PROCEDURE ............................................................................................. 26
WIRING DIAGRAM.............................................................................................................................. 27
PRINTED CIRCUIT BOARD................................................................................................................ 28
1. CIRCUIT CHECK PROCEDURE .................................................................................................. 28
2. PCB CIRCUIT DIAGRAM.............................................................................................................. 31
3. P.C.B. LOCATION NO. ................................................................................................................. 32
EXPLODED VIEW AND PARTS LIST................................................................................................. 34
1. DOOR ASSEMBLY ....................................................................................................................... 34
2. CONTROL PANEL ASSEMBLY.................................................................................................... 34
3. TOTAL ASSEMBLY....................................................................................................................... 34
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 .
(O nly a trained service personnel should m ake repairs.)
1) A broken door hinge.
2) A broken door view ing 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.
N o grease, soil or spatter should be allow ed to build up on these surfaces or inside the oven.
D O N OT ATTE M PT TO O P E R ATE THIS A P P LIA N CE W ITH TH E D O O R O P EN . The m icrow ave oven has concealed sw itches
to m ake sure the power is turned off w hen the door is opened. D o not attem pt to defeat them .
D O N OT ATTE M PT TO S E RV IC E TH IS A P P LIA N C E U N TIL Y O U H AVE R E A D THIS S E RV IC E M A NU A L.
2. FOR SAFE SERVICE PROCEDURES
1) If the oven is operative prior to servicing, a m icrowave em ission check should be perform ed prior to servicing the oven.
2) If any certified oven unit is found to servicing, a m icrowave em ission check should be perform ed prior to servicing the oven.
(a) inform the m anufacturer, im porter or assem bler,
(b) repair the unit at no cost to the ow ner,
(c) attem pt to ascertain the cause of the excessive leakage,
(d) tell the ow ner of the unit not to use the unit until the oven has been brought into com pliance.
3) If the oven operates with the door open, the service person should tell the user not to operate the oven and contact the
m anufacturer im m ediately.
IMPORTANT
The w ire in this m ains lead coloured in accordance w ith the follow ing code.
G reen-and-yellow : E arth
B lue : N eutral
B row n : Live
A s the colours of the w ires in the m anins lead of this appliance m ay not correspond w ith the coloured m arkings
identifying the term inals in your plug, proceed as follow s.
The w ire w hich is coloured green-and-yellow m ust be connected to the term ianl in the plug w hich is m arked with the
letter `E ', earth sym bol or coloured green-and-yellow.
The w ire w hich is coloured blue m ust be connected to the term inal which is m arked w ith the letter `N ' or
coloured black.
The w ire w hich is coloured brow n m ust be connected to the term inal w hich is m arked w ith the letter `L' or
coloured red.
NOTE
This oven is designed for counter-top use only.
SPECIFICATIONS
M O D EL K O R -371G /H KO R -391G /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
C O N SU M PTIO N G R ILL 1050W 1050W
C O M BIN ATIO N 2200W 2350W
M IC R O W AVE E N E R G Y O U TP U T 800W 900W
M IC R O W AVE F R E Q U E N C Y 2450M H z
O U T S ID E D IM EN SIO N S (W X H X D ) 465 x 279 x 360m m (18.3 x 11.0 x 14.2 in.) 495 x 294 x 388m m (19.5 x 11.6 x 15.3 in.)
C AV IT Y D IM E N S IO N S (W X H X D ) 290 x 220 x 306 m m (11.4 x 8.7 x 12.0 in.) 320 x 244 x 338m m (12.6 x 9.6 x 13.3 in.)
N E T W E IG H T A PP R O X . 13.7K g (30.2lbs.) AP PR O X. 15.8Kg (34.9lbs.)
TIM ER 59 m in. 90 sec.
FU N C T IO N S ELE C T IO N S M IC R O W AV E
PO W E R SE LE C T IO N S 10 LE VE LS
C AV IT Y VO LU M E 0.7 C u.Ft. 0.9 C u.Ft.
SPECIFICATIONS ARE SUBJECT TO CHANGE W ITHOUT NOTICE.
EXTERNAL VIEW
1. OUTER DIMENSION
465/495 360/388
279/294
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. DOOR RELEASE BUTTON - By pushing this button the latch system cut off all circuits and stops the oven before the
door is opened.
7. METAL RACK
8. COUPLER - This fits over the shaft in the center of the ovens cavity floor. This is to rem ain in the oven for all cooking.
9. ROLLER GUIDE - This m ust always be used for cooking together with the glass cooking tray.
10. GLASS COOKING TRAY - M ade of special heat resistant glass. Food in a proper receptacle is placed on this tray for
cooking.
11. DOOR VIEWING SCREEN - Allows viewing of food. The screen is designed so that light can pass through, but not the
m icrowave.
12. DOOR HOOK - When the door is closed, it will automatically shut off. If the door is opened while the oven is operating,
the magnetron will imm ediately stop operating.
EXTERNAL VIEW
3. CONTROL PANEL
(1) KOG-371G0S/391G0S
2
4
3
5 6
7
8 9
10 11
12 13
1
14 15
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. AUTO COOK - Used to cook or reheat.
5. MORE - Used to add tim e to cooking.
6. LESS - Used to rem ove tim e from cooking.
7. AUTO DEFROST - Used to defrost foods.(for weight)
8. COMBI - Used to cook COM BI.
9. GRILL - Used to cook GRILL
10. POWER - Used to set power level.
11. DEFROST - Used to defrost foods. (for tim e)
12. KITCHEN TIMER - Used as a m inute tim er, to delay the start of cooking, or to set a holding tim e after cooking.
13. CLOCK - Used to set clock.
14. STOP/CLEAR - Used to stop the oven operation or to delete the cooking data.
15. START/SPEEDY COOK - Used to start the oven and also used to set a reheat tim e.
EXTERNAL VIEW
(2) KOR-371H0S/391H0S
2
3
4 5
6
7 8
9 10
11 12
1
13 14
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. MORE - Used to add tim e to cooking.
5. LESS - Used to rem ove tim e f rom cooking.
6. AUTO DEFROST - Used to defrost foods, (for weight)
7. COMBI - Used to cook COM BI.
8. GRILL - Used to cook GRILL.
9. POWER - Used to set power level.
10. DEFROST - Used to defrost foods. (for tim e)
11. KITCHEN TIMER - Used as a m inute tim er, to delay the start of cooking, or to set a holding tim e after cooking.
12. CLOCK - Used to set clock.
13. STOP/CLEAR - Used to stop the oven operation or to delete the cooking data.
14. START/SPEEDY COOK - Used to start the oven and also used to set a reheat tim e.
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.
3. A w ay from radio and TV sets
Poor television reception and radio interference m ay result if the oven is located close to a TV, radio, antenna or feeder and so on.
Position the oven as far from them as possible.
4. A w ay from heating appliances and w ater taps
K eep the oven aw ay from hot air, steam or splash w hen choosing a place to position it, or the insulation m ight be adversely
affected and breakdow ns occur.
5. Power supply
C heck your local pow er source.
This m icrow ave oven requires a current of approxim ately 11 am peres, 230 Volts, 50 H z.
P ow er supply cord is about 0.8 m eters long.
The voltage used m ust be the sam e as specified on this oven. U sing a higher voltage m ay result in a fire or other accident
causing oven dam age. U sing low voltage will cause slow cooking. W e are not responsible for dam age resulting from use
of this oven w ith a voltage of am pere fuse other than those specified.
This appliance is supplied w ith cable of special type, w hich, if dam aged, m ust be repaired w ith cable of sam e type.
S uch a cable can be purchased from DA E W O O and m ust be installed by a Q ualified P erson.
6. Examine the oven after unpacking for any dam age such as:
A m isaligned door, broken door or a dent in cavity.
If any of the above are visible, D O N OT IN S TA LL, and notify dealer im m ediately.
7. D o not operate the oven if it is colder than room temperature
(This m ay occur during delivery in cold w eather.) Allow the oven to becom e room tem perature before operating.
EARTHING INSTRUCTIONS
This appliance m ust be earthed. In the event of an electrical short circuit, earthing reduces the risk of the electric shock by
providing an escape w ire for the electric current. This appliance is equipped with a cord having a earthing wire with a earthing
plug. The plug m ust be plugged into an outlet that is properly installed and earthed.
WARNING
Im proper use of the earthing plug can result in a risk of electric shock. C onsult a qualified electrician or servicem an if
the earthing instructions are not com pletely understood, or if doubt exists as to w hether the appliance is properly
earthed, and either : If it is necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade
earthing plug, and a 3-slot receptacle that w ill accept the plug on the appliance. The m arked rating of the extension
cord should be equal to or greater than the electrical rating of the appliance, or D o not use an extension cord.
OPERATIONS AND FUNCTIONS
1. Connect the main 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 must always
be in place during cooking.
3. Close the door securely.
4. When the oven door is opened, the light turns off.
5. The oven door can be opened at any time during operation by touching the door release button on the control panel.
The oven will automatically shut off. To restart the oven, close the door and then touch START.
6. Each time a pad is touched, a BEEP will sound to acknowledge the touch.
7. The oven automatically cook on full power unless set to a lower power level.
8. The display will show :0 when the oven is plugged in.
9. Time clock returns to the present time when the cooking time ends.
10. When the STOP/CLEAR pad is touched 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.
11. If the START pad is touched and the oven does not operate, check the area between the door and door is closed
securely. The oven will not start cooking under the door is completely closed or the program has been reset.
12. When using the GRILL or COMBI mode ;