Daewoo KOR-6L9R5S Service Manual

Service Manual

Microwave Oven

Model: KOR-6L9R5S

S/M No. :

May. 2012

✔ 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).

1

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 with the door open.

(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other micro-

wave 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 and latches, (5)
Evidence of dropping or abuse.

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

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

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

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

TABLE OF CONTENTS

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. FEATURES DIAGRAM ..............................................................................................................................................5

3. CONTROL PANEL .....................................................................................................................................................6

INSTALLATION...................................................................................................................................................................7

OPERATION PROCEDURE................................................................................................................................................8

DISASSEMBLY AND ASSEMBLY .....................................................................................................................................9

INTERLOCK MECHANISM AND ADJUSTMENT ............................................................................................................16

TROUBLESHOOTING GUIDE ..........................................................................................................................................17

MEASUREMENT AND TEST............................................................................................................................................22

1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT .................................................................................22

2. MICROWAVE RADIATION TEST ............................................................................................................................23

3. COMPONENT TEST PROCEDURE........................................................................................................................24

WIRING DIAGRAM ...........................................................................................................................................................25

PRINTED CIRCUIT BOARD .............................................................................................................................................26

1. CIRCUIT CHECK PROCEDURE .............................................................................................................................26

2. PCB CIRCUIT DIAGRAM.........................................................................................................................................30

3. P.C.B. LOCATION NO .............................................................................................................................................31

EXPLODED VIEW AND PARTS LIST ..............................................................................................................................32

1. DOOR ASSEMBLY ..................................................................................................................................................32

2. CONTROL PANEL ASSEMBLY...............................................................................................................................32

3. GUIDE WIND ASSEMBLY .......................................................................................................................................32

2

SAFETY AND PRECAUTIONS

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 APPLIANCE.
(Only 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 the dealer immediately.

IMPORTANT

The wire in this main lead coloured in accordance with the following code.

Green-and-yellow : Earth
Blue : Neutral
Brown : Live

As the colours of the wires in the main lead of this appliance may not correspond with the coloured markings
identifying the terminals in your plug, proceed as follows.
The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked with
the letter ‘E’, earth symbol or coloured green-and-yellow.
The wire which is coloured blue must be connected to the terminal which is marked with the letter ‘N’ or coloured
black.
The wire which is coloured brown must be connected to the terminal which is marked with the letter ‘L’ or
coloured red.

NOTE :

The oven is designed for counter-top use only.

3

MODEL KOR-6L9R5S

POWER SUPPLY 230V-50Hz, SINGLE PHASE WITH EARTHING

MICROWAVE 1200W

POWER CONSUMPTION GRILL

COMBINATION

MICROWAVE ENERGY OUTPUT 800W

MICROWAVE FREQUENCY 2450MHz

OUTSIDE DIMENSIONS (W X H X D) 446 X 270 X 346 mm(17.6 X 10.6 X 14.8 in)

CAVITY DIMENSIONS (W X H X D) 295 X 219 X 303 mm(11.6 X 8.6 X 11.9in)

NET WEIGHT APPROX. 10.3 kg(22.7lbs)

TIMER 60 min. 00 sec.

FUNCTION SELECTIONS MICROWAVE

POWER SELECTIONS 5 LEVELS

CAVITY VOLUME 0.7 Cu. Ft.

* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

SPECIFICATIONS

4

1. OUTER DIMENSION

EXTERNAL VIEW

270

446 346

5

1 2345

789

6

11

Door latch-When the door is closed it will automatically shut off. If the door is opened while the oven is operating,
the magnetron will automatically shut off.

22

Door seal-The door seal surfaces prevent microwaves escaping from the oven cavity.

33

Oven cavity

44

Spatter shield-Protects the microwave outlet from splashes of cooking foods.

55

Safety interlock system-Prevents the oven from operating while the door is opened.
The oven will only operate with the door fully closed. When the door is open, the oven turns off and will only start
again after the door is closed.

66

Control panel

77

Glass cooking tray-Made of special heat resistant glass. The tray can be easily removed for cleaning. Make sure
it is correctly positioned (indentation) before operating. Place food in a suitable container (dish) on the tray.

88

Roller guide-Supports the glass cooking tray.

99

Door screen-Allows viewing of food.
The screen is transparent to light, but prevents microwaves escaping.

2. FEATURE DIAGRAM

6

3

2

5

8

1

7

4

6

3. CONTROL PANEL

11

Display - Cooking time, power level and indicators are displayed.

22

Defrost- Used to defrost foods by weight or time.

33

Power- Used to set power level.

44

Timer - Used to set the timer.

55

Auto cook- Used to cook using a program or to reheat.

66

Dial knob- Used to set the time and weight.

77

Stop/Clear- Used to stop the oven operation or to erase all entries.

88

Start/Easy cook-Used to start the oven operation and also increase the reheat time by 30 seconds.

7

1. Steady, flat location

This microwave oven should be set on a steady, flat surface.

This microwave oven is designed for counter top use only.

2. Leave space behind and side

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

3. Away from radio, and TV sets

Poor television reception and radio interference may 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. 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.

5. Power supply

• Check your local power source.
This microwave oven requires a current of approximately 6 amperes, 230 Volts, 50 Hz.

• Power supply cord is about 0.8 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.

6. Examine the oven after unpacking for any damage such as:

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

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

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

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

INSTALLATION

WARNING

Improper use of the earthing plug can result in a risk of electric shock. Consult a qualified electrician or service-man
if the earthing instructions are not completely understood, or if doubt exists as to whether 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 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, or Do not use an
extension cord.

EARTHING INSTRUCTIONS

8

once P-HI 100%

twice P-80 80%

3 times P-60 60%

4 times P-40 40%

5 times P-20 20%

1) Connect the mains lead to an electrical outlet.

2) Open the oven door once to use the oven. The display lights up and the oven is ready to work.

3) 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.

4) Close the door firmly.

5) The oven door can be opened at any time during operation by pulling the door.
The oven will automatically shut off. To restart the oven, close the door and then press START button.

6) Each time a button is pressed. a BEEP will sound.

7) The oven will be turned off automatically when not in use for 10minutes after working. Open the oven door for using the
oven and then its display will turn on again.

8) When STOP/CLEAR button is pressed during the oven operation, the oven stops cooking and all information retained.
To erase all information, press STOP/CLEAR button once more. If the oven door is opened during the oven operation, all
information is retained.

9) If START button is pressed 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.

Wattage output chart

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

power.

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

OPERATION PROCEDURE

Press POWER button Power level (Display) Approximate Percentage of Power

9

DISASSEMBLY AND ASSEMBLY

Cautions to be observed when troubleshooting.

Unlike many other appliances, the microwave oven is high-voltage, high-current equipment.
It is completely safe 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.

1. Always remove the power plug from the outlet before servicing.

2. Use an insulated screwdriver and wear rubber gloves when servicing the high voltage side.

3. Discharge the high voltage capacitor before touching any oven components or wiring.

(1) Check the earthing.

Do not operate on a two-wire extension cord.
The microwave oven is designed to be used while earthed.
It is imperative, therefore, to make sure it is earthed
properly before beginning repair work.

(2) Warning about the electric charge in the high voltage capacitor.

For about 30 seconds after the operation stopped and 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 12A fuse is blown out due to the operation of the monitor
switch; replace primary interlock switch, secondary interlock switch and
interlock monitor switch.

5. After repair or replacement of parts, make sure that the screws are
properly tightened, and all electrical connections are tightened.

6. Do not operate without cabinet.

CAUTION : Service personnel should remove their watches whenever working close to or replacing the magnetron.

WARNING : When servicing the appliance, need a care of touching or replacing high potential parts because of

electrical shock or exposing microwave. These parts are as follows - HV Transformer, Magnetron,
HV Capacitor, HV Diode, HV fuse.

10

1. To remove cabinet

1) Remove four screws on cabinet back.

2) Pull the cabinet backward.

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.