Daewoo KOG-361Q, KOG-388Q Service Manual

Service Manual

Microwave Oven

KOG-361Q, KOG-362Q, KOG-364Q
KOG-381Q, KOG-382Q, KOG-384Q
KOG-388Q

D AEW OO ELECTRONICS CO ., LTD.

1

PRECAUTIONS TO BE OBSERVED BEFORE
AND DURING SERVICING TO AVOID
POSSIBLE EXPOSURE T O EXCESSIVE
MICROWAVE ENERGY

(a) Do not operate or allow the oven to be operated with door open.
(b) Make the following safety checks on all ovens to be serviced before activating the mag-

netron 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, (5) evidence of dropping or abuse.

(c) Before turning on microwave power for any service test or inspection within the microwave

gernerating compartments, check the magnetron, wave guide or transmission line, and cav­ity for proper alignment, intergrity, and connections.

(d) Any defective or misadjusted components in the interlock, monitor, door seal, and

microwave gerneration and transmission systems shall be repaired, or adjusted by proce­dures described in this manual before the oven is released to the owner.

(e) A micrewave leakage check to verify compliance with the federal performance standard

should be performed on each oven prior to release to the owner.

PROPER USE AND SERVICE PRECAUTIONS................................................................................. 2

SPECIFICATIONS................................................................................................................................ 3

FEATURES DIAGRAM......................................................................................................................... 4

EARTHING INSTRUCTIONS............................................................................................................... 5

INSTALLATION..................................................................................................................................... 5

OPERATION PROCEDURE................................................................................................................. 6

CONTROLS .......................................................................................................................................... 7

INTERLOCK MECHINISM FUNCTIONS AND ADJUSTMENTS........................................................ 19

SAFETY PRECAUTIONS FOR DISASSEMBLY AND REPAIR.......................................................... 21

DISASSEMBLY AND ASSEMBLY....................................................................................................... 22

TROUBLE SHOOTING GUIDE............................................................................................................ 28

MEASUREMENT OF THE MICROWAVE OUTPUT POWER ............................................................ 35

WIRING DIAGRAM............................................................................................................................... 37

CIRCUIT DESCRIPTION...................................................................................................................... 39

COMPONENT TEST PROCEDURE.................................................................................................... 42

SAFETY INTERLOCK CONTINUITY TEST......................................................................................... 43

PRINTED CIRCUIT BOARD................................................................................................................. 44

CIRCUIT CHECK PROCEDURE...................................................................................................... 44

COMPONENT INFORMATION........................................................................................................ 49

PRINTED CIRCUITS BOARD.......................................................................................................... 50

P.C.B. CIRCUIT DIAGRAM.............................................................................................................. 51

P.C.B. LOCATION NO...................................................................................................................... 52

EXPLODED AND PARTS LIST............................................................................................................ 53

TABLE OF CONTENTS

1. For Safe Operation
Damage that allows the microwave energy (that cooks or heats the food) to escape will result in

poor cooking and may cause serious bodily injury to the operator.
IF ANY OF THE FOLLOWING CONDITIONS EXIST. OPERATOR MUST NOT USE THE APPLI-

ANCE. (Only a trained service personnel should make repairs.)

1) A broken 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 grease, soil or spatter should be allowed to build up on these surfaces or inside the oven.
DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN. The microwave

oven has concealed switches to make sure the power is turned off when 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 the oven.
(a) inform the manufacturer, importer or assembler,
(b) repair the unit at no cost to the owner,
(c) attempt to ascertain the cause of the excessive leakage,
(d) tell the owner of the unit not to use the unit until the oven has been brought into compliance.

3) If the oven operates with the door open, the service person should tell the user not to operate
the oven and contact the manufacturer and CDRH immediately.

2

CAUTION : This device is to be serviced only by properly qualified service personnel. consult the

service manual for proper Service procedures to assure continued safety operation
and for precautions to be taken to avoid possible exposure to excessive microwave
energy.

PROPER USE SERVICE PRECA UTIONS

CAUTIOU

MICROWAVE RADIATION

PERSONNEL SHOULD NOT BE EXPOSED TO THE MICROWAVE ENERGY WHICH MAY
RADIATE FROM THE MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT
IS IMPROPERLY USED OR CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CON­NECTIONS. WAVEGUIDE, FLANGES AND GASKETS MUST BE SECURE. NEVER OPERATE
THE DEVICE WITHOUT A MCROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER
LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED.

* Specifications subject to change without notice.

POWER SUPPLY

MICROWAVE

POWER CONSUMPTION

GRILL

COMBINATION
MICROWAVE ENERGY OUTPUT
MICROWAVE FREQUENCY
OUTSIDE DIMENSIONS (W x D x H)
CAVITY DIMENSIONS (W x D x H)
NET WEIGHT
TIMER
FUNCTION SELECTIONS
MICROWAVE POWER LEVELS

KOG-361Q/362Q/364Q

KOG-381Q/382Q/384Q/388Q
230V~50Hz, SINGLE PHASE WITH EARTHING
1200W 1350W
1050W 1050W
2200W 2350W

800W 900W

2450MHz
465 x 360 x 274 mm 495 x 382 x 289 mm
290 x 290 x 200 mm 320 x 330 x 225 mm

14.5kg 16.5kg

59 min. 99 sec.

MICROWAVE / GRILL / COMBINATION

10 – LEVELS

3

SPECIFICATIONS

( ) : For KOG-381Q/382Q

1 Door latch–When the door is closed it will

automatically lock shut. If the door is
opened while the oven is operating, the
magnetron will automatically shut off.

2 Door seal–The door seal maintains the

microwave within the oven cavity and pre-

vents microwave leakage.
3 Oven cavity.
4 Spatter shiled–Protects the microwave

outlet from splashes of cooking foods.
5 Safety interlock system–Prevents the

oven from operating while the door is

opened.
6 Door release button–Pushing this button

stops oven operation and opens the door.
7 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.
8 Roller guide–Supports the glass cooking

tray.
9 Door screen–Allows viewing for food. The

Screen is designed so that light can pass

through, but not the microwaves.
10 Time set pad–Used to set the cooking

time and the present time

11 Display–Cooking time, power level, pre-

sent time are displayed.

12 Speedy cook–Touch to set the any

desired reheat setting.
13 Combi–Used to cook COMBI.
14 Grill–Used to cook Grill.
15 Baked potato–

Used to cook baked potato.
16 Dinner plate–Used to reheat dinner plate.
17 Soup–Used to reheat soup.
18 Beverage–Used to reheat beverage.
19 Frozen pizza–Used to reheat frozen

pizza.

20 Fresh vegetable–Used to blanch fresh

vegetable.
21 More–Used to add on one touch cooking.
22 Less–Used to remove one touch cooking.
23 Auto defrost–Used to defrost foods.
24 Power–Used to set power level.
25 Clock/A.start–Used to set clock & Used

to set auto start.
26 Feeding bottle–Used to disinfect bottle.
27 Stop/Clear–Used to stop the oven opera-

tion or to delete the cooking data.
28 Start–Used to start a selected operation.
29 Reflector (Insulator Heater).
30 Heating Element.
31 Metal Rack.
32 Coupler.

4

FEATURES DIAGRAM

This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk

of electric shock by providing an escape, wire for the electric current. This appliance is equipped with
a cord having a earthing wire with a earthing plug. The ploug must be plugged into an outlet that is
properly installed and earthed.

5

EARTHING INSTRUCTIONS

WARNING : Improper use of the earthing plug can result in a risk of electric shock. Consult a

qualified electrician or serviceman if the earthing instructions are not completely
understood, or if doubt extension to whether the appliance is properly earthed. If it
necessary to use an extension cord, use only a 3-wire extension cord that has a 3­blade earthing plug, and a 3-slot receptacle that will accept the plug on the appli­ance. The marked rating of the extension cord should be equal to or greater than
the electrical rating of the appliance.

INSTALLATION

Steady, flat location

This oven should be set on a steady, flat surface.
This oven is designed for counter top use only.

Leave space behind and side

All air vents should be kept a clearance. lf all vents are covered during operation, the oven may
overheat and, eventually, oven failure.

Away from Radio and TV sets

Poor television reception and radio interference may result if the oven is located close to a TV,
Radio, or antenna, feeder and so on.
Position the oven as far from them as possible.

Away from heating appliances and water taps

Keep the oven away from hot air, steam or splash when choosing a place to position it, or the
insulation might be adversely affected and breakdowns occur.

Power supply

• Check your local power source. This oven requires a current of approximately 12 amperes.
230V 50Hz.

• Power supply cord is about 1.1 meters long.

• The voltage used must be the same as specified on this oven. Using a higher voltage may
result in a fire or other accident causing oven damage. Using low voltage will cause slow
cooking. We are not responsible for damage resulting from use of this oven with a voltage of
ampere fuse other than those specified.

• This appliance is supplied with cable of special type, which, if damaged, must be repaired with
cable of same type. such a cable can be purchased from DAEWOO and must be installed by
a Qualified Person.

Examine the oven after unpacking for any damage such as:

A misaligned door, broken door, A dent in cavity.
If any of the above are visible, DO NOT INSTALL, and notify dealer immediately.

Do not operate the oven if it is colder than room termperature.

(This may occur during delivery in cold weather.) Allow the oven to become room temperature
before operating.

1
2
3

4
5

6
7

Approximate Percentage

of Power

100%

90%
80%
70%
60%
50%
40%
30%
20%
10%

0%

This section includes useful information about oven operation.

1. Plug power supply cord into a 230V 50Hz power 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. Shut the door. Make sure that it is firmly closed.

Wattage output chart

The power-level is set by pressing the POWER pad. The chart shows the display, the power level and
the percentage of power.

6

OPERATION PROCEDURE

When the oven door is opened, the light
turns off.

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.

Each time a pad is touched, a BEEP will
sound to acknowledge the touch.

The oven automatically cook on full power
unless set to a lower power level.

The display will show “ : 0” when the oven
is plugged in.

Time clock returns to the present time
when the cooking time ends.

When the STOP/CLEAR pad is touched
during the oven operation, the oven stops
cooking and all information retained. To
erase all information retained. To erase all
information (except the present time),
touch the STOP/CLEAR pad once more. lf
the oven door is opened during the oven
operation, all information is retained.

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 until the door is
completely closed or the program has
been reset.

1
2

3
4
5

6
7

8

Make sure the oven is properly installed
and plugged into the electrical outlet.

Touch Power pad,

Once the touch

POWER

9
8
7
6
5
4
3
2
1
0

Power Level (Display)

P-HI
P-90
P-80
P-70
P-60
P-50
P-40
P-30
P-20
P-10
P- 0

When the oven is first plugged in, the display will flash “ : 0” and a tone will sound. If the AC power
ever goes off, the display will flash “ : 0” when the power comes back on.

DO THIS THIS HAPPENS...

7

SETTING THE CLOCK

1. Touch CLOCK/
A.START pad.

This is a 12 hour clock system.

CLOCK/

A.STAR T

2. Touch CLOCK/
A.START pad once
more.

This is a 24 hour clock system.

CLOCK/

A.STAR T

4. Touch CLOCK/
A.START pad.

The display stop blinking and the colon starts blinking.
If you selected 12 hour clock system this digital clock allows you to set
from 1:00 to 12:59.
If you selected 24 hour clock system, this digital clock allows you to
set from 0:00 to 23:59

CLOCK/

A.STAR T

3. Enter the correct time of
day by touching the num­bers in sequence.

The display will then begin blink­ing.

1 2 3 0

NOTE : This oven is multiple

clock system. If you
want 12 hour clock
system, can be
omitted this step.

NOTE : If you attempt to enter an incorrect time, the time will not be set and a error signal tone will

sound. Touch the CLOCK/A.START pad re-enter the time.

CONTROLS

WEIGHT DEFROST lets you easily defrost food by eliminating guesswork in determining defrosting
time. The minimum weight for WEIGHT DEFROST is 200 grams. The maximum weight for WEIGHT
DEFROST is 3000 grams. Follow the steps below for easy defrosting.

8

WEIGHT DEFROSTING

DO THIS THIS HAPPENS...

1. Touch AUTO
DEFROST pad.

The WEIGHT DEFROST indica­tor lights and “0” is displayed.
And the g indicator starts blink­ing.

AUTO

DEFROST

2. Touch number pads for
the defrosting weight
you want.

The display will show the num­bers you pressed in the order
you touched.

5 0 0

3. Touch START pad.

WEIGHT DEFROSTING begins. The defrosting time is automatically
determined by the food category and weight entered.
The g indicator goes off and the WEIGHT DEFROST indicator blinks
and the defrosting time counts down in the display window. The oven
beeps during the defrosting cycle to signal that the food needs to be
turned or rearranged.
When the defrosting time ends, you will hear 3 beeps.

STAR T

NOTE : To prevent over defrosting thin areas or edges can be shielded with strips of aluminum

foil.

When TIME DEFROST is selected, the automatic cycle divides the defrosting time into periods of
alternating defrost and stand times by cycling on and off.

9

TIME DEFROSTING

DO THIS THIS HAPPENS...

1. Touch AUTO
DEFROST pad.

The WEIGHT DEFROST indica­tor lights and “0” is displayed.
And the g indicator starts blink­ing.

AUTO

DEFROST

2. Touch AUTO
DEFROST pad once
more.

The TIME DEFROST indicator
lights and “ : 0” is displayed.

AUTO

DEFROST

3. Touch number pads for
the defrosting time you
want.

The display will show the num­bers you pressed in the order
you touched.

2 7 1 0

NOTE : Your oven can be

programmed for 59
minutes 99 sec­onds. (59:99)

4. Touch START pad.

When you touch START pad, the TIME DEFROST indicator starts
blinking to show the oven is in the TIME DEFROST mode. The dis­play counts down the time to show you how much defrosting time is
left in the TIME DEFROST mode. The oven beeps during the defrost­ing cycle to signal that the food needs to be turned or rearranged.
When the defrosting time ends, you will hear 3 beeps.

STAR T

NOTE : To prevent over defrosting, thin areas or edges can be shielded with strips of aluminum

foil.

10

COOKING IN ONE STAGE

DO THIS... THIS HAPPENS...

1. Touch POWER pad.

The M/W indicator lights and
“P- ” is displayed.

POWER

4. Touch START pad.

When you touch START pad, the M/W indicator starts blinking to
show the oven is cooking.
The display counts down the time to show how much cooking time is
left. When the cooking time ends, you will hear 3 beeps.

STAR T

2. Touch the number
pad for the power
level you want.

The display will show what you
touched. This example shows
power level 3.

3

NOTE: If steps 1 and 2 are

omitted, the oven will
cook at full power.

3. Touch number pads
for the cooking time.

The display will show the num­bers you pressed in the order
you touched.

3 05

NOTE: Your oven can be

programmed for 59
minutes 99 seconds.
(59:99)

NOTE: Using lower power levels increase the cooking time which is recommended for foods such

as cheese, milk and slow cooking of meats.

11

GRILL COOKING

This function allows you to brown food quickly.
The heating element is located in the top of the oven.
There is no pre-heating the oven for grill cooking. Place food inside the oven when setting the con­trols.

DO THIS... THIS HAPPENS...

1. Touch GRILL pad.

The GRILL indicator lights and
“ :0” is displayed.

GRILL

3. Touch START pad.

When you touch START pad, the GRILL indicator starts blinking to
show the oven is cooking.
The display count down the time to show how much cooking time is
left. When the cooking time ends, you will hear 3 beeps.

STAR T

2. Touch number pads
for the cooking time.

The display will show the num­bers you pressed in the order
you touched.
This example shows 25 min­utes.

2 5 0 0

NOTE: Time can be set up

to 30 minutes.

COMBI COOKING

This oven has combination mode which cooks food with heater and microwave at the same time.
The combination mode accelerates the cooking process.

DO THIS... THIS HAPPENS...

CATEGORY TOUCH PAD APPROXIMATE PERCENTAGE OF MICROWAVE POWER

12

1. Touch COMBI pad.

The COMBI indicator lights and
“ :0” is displayed.
Pressing this pad repeatedly
changes category as shown in
the chart below.

COMBI

3. Touch START pad.

When you touch START pad, the COMBI indicator starts blinking to
show the oven is cooking.
The display count down the time to show how much cooking time is
left. When the cooking time ends, you will hear 3 beeps.

STAR T

2. Touch number pads
for the cooking time.

The display will show the num­bers you pressed in the order
you touched.
This example shows 25 min­utes.

:0

HI

LO

ONCE

TWICE

3 TIMES

50%

60%

40%

2 0 0 0

NOTE: Time can be set up

to 59 minutes 99
seconds.

13

A UTO STAR T

Allows you to program cooking to start at a time you select.
The food will automatically start cooking at the desired time.

DO THIS... THIS HAPPENS...

1. Program the desired power level and cooking time.

2. Touch CLOCK/
A.START pad.

The AUTO START indicator
lights and “ :0” is displayed.

CLOCK/

A.STAR T

4. Touch START pad.

When you touch START pad, the present time appears in the display
and the cooking program indicators come on.
The AUTO START indicator and the colon start blinking.
When the selected start time arrives the oven bigins. Operating and
the oven light turns on. The AUTO START indicator goes off and the
next stage indicator begins to blink.
When the cooking is completed you will hear 3 beeps. The oven turns
off and the present time appears in the display.

STAR T

3. Enter the desired
start time by press­ing the number pads.

The display will show the num­bers you pressed in the order
you touched.
This example shows 11:30

1 1 3 0

NOTE: AUTO START can be used for time cooking, if clock is set. If the oven door is opened

after programming AUTO START, it is necessary to touch the START pad for the time of
day to appear in the readout so that the oven will automatically begin programmed cook­ing at the chosen AUTO START time. Before setting, check to make sure the clock is
showing the correct time of day.

14

TO CHECK AUT O START TIME

Once you have correctly programmed the oven for AUTO START, the present time will appear on the
display.

DO THIS... THIS HAPPENS...

SPEEDY COOK

SPEEDY COOK allows you to reheat for 30 seconds at 100% (full power) by simply touching the
SPEEDY COOK pad.
By repeatedly touching the SPEEDY COOK pad, you can also extend reheating time to 5 minutes by
30 seconds.

DO THIS... THIS HAPPENS...

1. Touch CLOCK/
A.START pad.

The programmed AUTO START
time will appear on the display
for 3 seconds.

CLOCK/

A.STAR T

1. Touch SPEEDY
COOK pad.

When you touch SPEEDY
COOK, “ :30” is displayed.
After 1.5 seconds, the oven
starts reheating.

SPEEDY

COOK

15

ONE TOUCH COOKING

One touch cook allows you to cook or reheat many of your favorite foods by touching just one pad. To
increase quantity, touch chosen pad until number in display is same as desired quantity to cook.
(except for DINNER PLATE)

DO THIS... THIS HAPPENS...

DO THIS... THIS HAPPENS...

1. Touch FROZEN
PIZZA pad.

When you touch FROZEN
PIZZA “200” is displayed.
After 1.5 seconds, the display
changed into cooking time of
quantity and the oven starts
cooking.

FROZEN

PIZZA

1. Touch BEVERAGE
pad.

When you touch BEVERAGE
pad, “1” is displayed.
After 1.5 seconds, the display
changed into cooking time of
quantity and the oven starts
cooking.

BEVERAGE

*

FORZEN PIZZA

*

• 200g: Touch FROZEN PIZZA once.

• 300g: Touch FROZEN PIZZA twice within 1.5 seconds.

NOTE: 1. Use only one frozen pizza at a time.

2. Use only frozen pizza for microwave oven.

3. If the cheese of frozen pizza does not melt sufficiently, cook a few seconds longer.

4. Some brands of frozen pizza may require more or less cooking time.

DO THIS... THIS HAPPENS...

DO THIS... THIS HAPPENS...

16

*

BEVERAGE * (250ml/cup)

• 1 cup (mug): Touch BEVERAGE once.

• 2 cups (mugs): Touch BEVERAGE twice within 1.5 seconds.

• 3 cups (mugs): Touch BEVERAGEthree times within 1.5 seconds.

NOTE: 1. This setting is good for restoring cooled beverage to a better drinking temperature.

2. Stir after cooking.

1. Touch DINNER
PLATE pad.

When you touch DINNER
PLATE pad, “300“ is displayed.
After the 1.5 seconds, the dis­play changed into cooking time
of quantity and the oven starts
cooking.

DINNER

PLATE

1. Touch SOUP pad.

When you touch SOUP pad,
“250” is displayed.
After the 1.5 seconds, the dis­play changed into cooking time
of quantity and the oven starts
cooking.

SOUP

NOTE: For best results, consult the cookbook.

*

SOUP

*

• 250g: Touch SOUP once.

• 350g: Touch SOUP twice within 1.5 seconds.

NOTE: For best results, consult the cookbook.

17

DO THIS... THIS HAPPENS...

DO THIS... THIS HAPPENS...

1. Touch FRESH
VEGETABLE pad.

When you touch FRESH VEG­ETABLE pad, “200” is displayed.
After the 1.5 seconds, the dis­play changed into cooking time
of quantity and the oven starts
cooking.

FRESH

VEGETABLE

1. Touch BAKED
POTATO pad.

When you touch BAKED POTA­TO pad, “1” is displayed.
After the 1.5 seconds, the dis­play changed into cooking time
of quantity and the oven starts
cooking.

BAKED

POTATO

*

BAKED POTATO * (160~180g/ea.)

• 1 NO (ea.): Touch BAKED POTATO once.

• 2 NO (ea.): Touch BAKED POTATO twice within 1.5 seconds.

• 3 NO (ea.): Touch BAKED POTATO three times within 1.5 seconds.

NOTE: For best results, consult the cookbook.

*

FRESH VEGETABLE

*

• 200g: Touch FRESH VEGETABLE once.

• 300g: Touch FRESH VEGETABLE twice within 1.5 seconds.

NOTE: For best results, consult the cookbook.