Daewoo KOR-1N4A9W User manual

Brand: Daewoo

Model: KOR-1N4A9W

Category: Microwaves

Type: User manual

Service Manual

Microwave Oven

Model: KOR-1B4H9S

DAEWOO ELECTRONICS CORP.

S/M No. : R1B4H9S001

http : //svc.dwe.co.kr Nov. 2003

✔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).

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.

erating compartments, check the magnetron, wave guide or transmission line, and cavity for proper align-

ment, 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.

(e)A microwave leakage check to verify compliance with the Federal performance standard should be per-

formed on each oven prior to release 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. FEATURE DIAGRAM........................................................................................................................................5

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

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

OPERATIONS AND FUNCTIONS.......................................................................................................................................8

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

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

TROUBLE SHOOTING GUIDE .........................................................................................................................................17

MEASUREMENT AND TEST............................................................................................................................................21

1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ........................................................................21

2. MICROWAVE RADIATION TEST...................................................................................................................22

3. COMPONENT TEST PROCEDURE...............................................................................................................23

WIRING DIAGRAM............................................................................................................................................................24

PRINTED CIRCUIT BOARD..............................................................................................................................................25

1. CIRCUIT CHECK PROCEDURE ....................................................................................................................25

2. PCB CIRCUIT DIAGRAM................................................................................................................................28

3. P.C.B. LOCATION NO ....................................................................................................................................29

EXPLODED VIEW AND PARTS LIST...............................................................................................................................30

1. DOOR ASSEMBLY .........................................................................................................................................30

2. CONTROL PANEL ASSEMBLY......................................................................................................................30

3. TOTAL ASSEMBLY.........................................................................................................................................30

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 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,

(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 mains lead coloured in accordance with the following code.

Green-and-yellow : Each

Blue : Neutral

Brown : Live

As the colors of the wires in the manins lead of this appliance may not correspond with the colored markings

identifying the terminals in your plug, proceed as follows.

The wire which is colored green-and-yellow must be connected to the terminal in the plug which is marked with

the letter E , earth symbol or colored green-and-yellow.

The wire which is colored blue must be connected to the terminal which is marked with the letter N or colored

black.

The wire which is colored brown must be connected to the terminal which is marked with the letter L or

colored red.

NOTE

This oven is designed for counter-top use only.

MODEL KOR-1B4H9S

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

POWER CONSUMPTION MICROWAVE 1400W

MICROWAVE ENERGY OUTPUT 1000W

MICROWAVE FREQUENCY 2450MHz

OUTSIDE DIMENSIONS (W X H X D) 560 x 344 x 471 mm (22.0 x 13.5 x 18.5 in)

CAVITY DIMENSIONS (W X H X D) 369 x 246 x 394 mm (14.5 x 9.7 x 15.5 in)

NET WEIGHT APPROX. 18.0 kg (39.7 Ibs.)

TIMER 99 min. 90 sec.

FUNCTION SELECTIONS MICROWAVE

POWER SELECTIONS 10 LEVELS

CAVITY VOLUME 1.3 Cu. Ft.

* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

SPECIFICATIONS

EXTERNAL VIEW

1. OUTER DIMENSION

560 471

344

Dish

Warmer

M/W Def. Timer Lock g

Fresh

Vegetable

Frozen

Vegetable

Auto Defrost

Poutly Meat

1hour

Power

10m.

Pasta

Beverage

Frozen

Pizza

10min.

1m.

1min.

10s.

Defrost

Kitchen

Timer

Stop/

Clear Start/

Speedy Cook

Clock

Fish

1. DOOR SEAL

Door seal maintains the microwave within the oven cavity and prevents microwave leakage.

2. DOOR HOOK

When door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will

immediately stop operating.

3. DOOR SCREEN

Allows viewing of food. Microwave cannot pass through perforations in screen.

4. SPATTER SHIELD

Protects the microwave outlet from splashes of cooking foods.

5. OVEN LAMP

Automatically turns on during oven operating.

6. SAFETY INTERLOCK SYSTEM

7. CONTROL PANEL

8. GLASS COOKING TRAY

Made of special heat resisant glass. The tray must always be in proper position before operating. Do not cook food

directly on the tray.

9. OVEN FRONT PLATE

10. ROLLER GUIDE

Supports the glass cooking tray.

2. FEATURE DIAGRAM

39 5

Dish

Warmer

M/W Def. Timer Lock g

Fresh

Vegetable

Frozen

Vegetable

Auto Defrost

Poutly Meat

1hour

Power

10m.

Pasta

Beverage

Frozen

Pizza

10min.

1m.

1min.

10s.

Defrost

Kitchen

Timer

Stop/

Clear Start/

Speedy Cook

Clock

Fish

3. CONTROL PANEL

1DISPLAY - Cooking time, power level, indicators and the current time are displayed.

2ONE TOUCH COOK - Used to cook or reheat specific quantities of food.

3MORE - Used to add one touch cooking.

4LESS - Used to remove one touch cooking.

5AUTO DEFROST - Used to defrost foods.

6TIME SET PAD - Used to set the cooking time and the present time.

7POWER - Used to set power level.

8KITCHEN TIMER - Used as a minute timer, delay cooking, hold setting after cooking.

9DEFROST - Used to defrost foods for time.

0CLOCK - Used to set clock.

qSTOP/CLEAR - Used to stop the oven operation or to delete the cooking data.

wSTART/SPEED COOK - Used to start oven and also used to set a reheat time.

8 0

q w

INSTALLATION

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 15 amperes, 230 Volts, 50 Hz.

Power supply cord is about 1.2 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 are 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.

EARTHING INSTRUCTIONS

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 earth-

ing plug. The plug must be plugged into an outlet that is properly installed and earthed.

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 plut, 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.

OPERATIONS AND FUNCTIONS

11.Connect the main lead to an electrical outlet.

12.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.

13. Close the door securely.

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

15. The oven door can be opened at any time during operation.

The oven will automatically shut off. To restart the oven, close the door and then touch START.

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

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

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

19.

When the STOP/CLEAR

button is touched during the oven operation, the oven stops cooking and all information is retained.

To erase all information (except the present time), touch the

STOP/CLEAR

button once more. If the oven door is opened

during the oven operation, all information is retained.

10.If the START button is touched and the oven does not operate, check door is closed securely.

The oven will not start cooking unless the door is completely closed or the program has been reset.

Wattage output chart

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

age of power.

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

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

Once P-HI 100%

Twice P-90 90%

3 times P-80 80%

4 times P-70 70%

5 times P-60 60%

6 times P-50 50%

7 times P-40 40%

8 times P-30 30%

9 times P-20 20%

10 times P-10 10%

11 times P-00 0%

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 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 ware rubber gloves when servicing the high voltage side.

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

(1) Check the grounding.

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 15A 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.

1. To remove cabinet

1) Remove four screws on cabinet back.

2) Push 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.

3. To remove door parts.

REF NO. PART CODE PART NAME DESCRIPTION Q TY REMARK

A01 3512604210 HANDLE DOOR S45C 1

A02 3515308200 SUPPORTER HANDLE S45C 2

A03 3511605510 DECORATOR DOOR *U STS430 T0.5 HL 1

A04 3511605400 DECORATOR DOOR *T STS430 T0.5 HL 1

A05 3511605700 DECORATOR DOOR *L STS430 T0.5 HL 1

A06 3511605600 DECORATOR DOOR *R STS430 T0.5 HL 1

A07 3512204750 FRAME DOOR ABS SG-175 SG-0760D 1

A08 7001503311 SCREW MACHINE PAN 5X33 MFZN 2

A09 3517004080 BARRIER-SCREEN *O TEMP GLASS T3.2 MIRROR 1

A10 3515204900 STOPPER HINGE *T AS KOC-1B0K0S 1

A11 3511716100 DOOR PAINTING AS KOR-1B4H0A 1

A12 3513101200 HOOK POM 1

A13 3515101800 SPRING HOOK PW1 1

A14 3512302310 GASKET DOOR PP 1

A11

A12

A13

A14

A10

A05

A07

A09

A01

A02

A08

A04

A03

A06

(1) Remove the gasket door(A14) from door plate.

(2) Remove two screws(A08) from door plate.

(3) Remove the door handle (A01) and handle supporter (A02) from door plate.

(4) Remove the four door decorators (A03~A06) from door frame.

(5) Remove the door frame (A07) from door plate.

(6) Remove the stopper hinge top(A10) from door plate.

(7) Remove the spring(A13) and the hook(A12).

(8) Remove the barrier screen outer(A09) from door frame.

(9) Reverse the above steps for reassembly.

✔ 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).

4. Method to reduce the gap between the door seal and the oven front surface.

(1) To reduce gap located on part A

Loosen a screws on stopper hinge top, and then push

the door to contact the door seal to oven front surface.

Tighten two screws.

(2) To reduce gap located on part B

Loosen two screws on stopper hinge under, and then

push the door to contact the door seal to oven front

surface.

Tighten two screws.

NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm2.

FISH

MEAT

POULTRY

CLOCK

KITCHEN

START/

SPEEDY COOK

TIMER

STOP/CLEAR

DEFROST

POWER

LOCK

M/W DEF

TIMER

DINNER

VEGETABLE

FROZEN

LESS

POPCORN

PIZZA

FROZEN

BEVERAGE

FRESH

VEGETABLE

PLATE

5. To remove control panel parts.

Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.

2) Remove four screws which secure the PCB assembly to control panel.

3) Disconnect membrane tail from the connector of the PCB assembly.

4) Detach membrane from the control panel.

5) Reverse the above steps for reassembly.

REF NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK

B01 3518523410 SWITCH MEMBRANE KOR-1B4H9S 1

B02 3511607600 DECORATOR C-PANEL STS430 HL T0.5 1

B03 3516727040 CONTROL PANEL ABS SG-175, SG-0760D 1

B04 PKMPMSKT10 PCB AS KOR-1B4H9S 1

B05 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 4

✔ 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).

NOTE : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to pre-

vent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall

not exceed 4mW/cm2 for a fully assembled oven with door normally closed.

6. To remove high voltage capacitor.

1) Remove a 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 a screw which secure the magnetron.

2) Remove the magnetron.

3) Reverse the above steps for reassembly.

Metallic

gasket

plate

Cooling fin

Filament

terminal

Magnetron antenna

8. To remove wind guide assembly.

1) Remove a screw which secure the wind guide assembly.

2) Draw forward the wind guide assembly.

3) Pull the fan from the motor shaft.

4) Remove two screws which secure the motor shaded pole.

5) Remove the motor shaded pole.

6) Reverse the above steps for reasembly.

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.

INTERLOCK MECHANISM AND ADJUSTMENT

The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when

the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave.

(1) Primary interlock switch

When the door is closed, the hook locks the oven door. If the door is not closed properly, the oven will not operate.

When the door is closed, the hook pushes the button of the microswitch. Then the button of the primary interlock switch

bring it under ON condition.

(2) Secondary interlock switch and interlock monitor switch

When the door is closed, the hook pushes the lock lever downward. The lock lever presses the button of the interlock

monitor switch to bring it under NO condition. The lock lever 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.

c) Make sure that lock lever moves smoothly after adjustment is completed.

d) Tighten completely two mounting screws.

ADJUSTMENT :

Interlock monitor switch

When the door is closed, the interlock monitor switch should be changed (NO condition) before other switches are closed.

When the door is opened, the interlock monitor switch should be changed (NC condition) after other switches are opened.

NOTE :

Microwave emission test should be performed after adjusting interlock mechanism.

If the microwave emission exceed 4mW/cm

, readjust interlock mechanism.

RD,GY

RD,RD

BK,BK

WH,BK

(TROUBLE 1) Oven does not operate at all ; any inputs can not be accepted.

TROUBLE SHOOTING GUIDE

Following the procedure below to check if the oven is defective or not.

1. Check grounding before trouble checking.

2. Be careful of the high voltage circuit.

3. Discharge the high voltage capacitor.

4. When checking the continuity of the switches, fuse or high voltage transformer, disconnect one lead wire from these parts

and check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.

NOTE : When electric parts are checked, be sure the power cord is not inserted the wall outlet.

Check wire harness, wiring and connected of the terminals and power cord before check the parts listed

below.

CONDITION CHECK

Check continuity of interlock

monitor switch with door closed

Malfunction of

interlock moni-

tor switch

Malfunction of

interlock switch

Shorted con-

tacts of primary

interlock switch.

RESULT

Continuity

No Continuity

CAUSE REMEDY

Replace

NOTE 1

Fuse blows.

Replace

NOTE 1

No Continuity

Continuity

Defective low

voltage trans-

former

Ω

or infinite

Approx.

150~310

(normal)

Replace

Check continuity of primary

winding of low voltage trans-

former

Defective low

voltage trans-

former

Fuse again

blows Replace

Disconnect high voltage fuse

and operate the unit

Continuity Replace

Check continuity of primary inter-

lock switch contact with door

partially open until interlock mon-

itor switch contact close

(COM NO)

Check continuity of both primary

and secondary interlock switch

with door colosed

CONDITION CHECK

Check continuity of primary inter-

lock switch Malfunction of pri-

mary interlock

switch

RESULT

Continuity

CAUSE REMEDY

Adjust or

replace

Turn table

motor and

oven lamp

do not turn

on Check continuity of secondary

interlock switch Malfunction of sec-

ondary interlock

switch

Continuity Adjust or

replace

Check D.C. voltage being sup-

plied to RELAY (RY2) coil Defective touch

control circuit

0 V Replace

Faulty contacts of

RELAY (RY2) or

open relay coil

Approx.

12 VDC Replace

NOTE

All these switches must be replaced at the same time, please refer to “Interlock Mechanism And Adjustment”.

(TROUBLE 2) Display shows all figures selected, but oven does not start cooking, even though desired program and

time are set and start button is tapped.

CONDITION CHECK

Check continuity of magnetron Defective mag-

netron

RESULT

Continuity

CAUSE REMEDY

Replace

Outlet has

proper volt-

age Fuse

does not

blow. Check continuity of

noise filter board Defective mag-

netron

Continuity Replace

Check continuity of

power supply cord Open power sup-

ply cord

Continuity Replace

Defective touch

control circuit

Normal Replace

(TROUBLE 3) No microwave oscillation even though fan motor rotates.

CONDITION CHECK RESULT

Check continuity of high

voltage capacitor terminals

with wires removed

Continuity

CAUSE

Defective high

voltage trans-

former

REMEDY

Replace

microwave

oscillation Check continuity of high

voltage fuse

Replace high voltage fuse

Continuity

Check continuity of high voltage

rectifier in forward and backward

direction with DC megger

Continuity in

backward

direction

Defective high

voltage rectifier Replace

Connect megger leads to mag-

netron terminal and magnetron

body

Continuity Defective mag-

netron Replace

Check resistance of primary and

secondary coil of high voltage

transformer

‰

or Defective high

voltage trans-

former

Replace

Check continuity of magnetron

with wires removed

Continuity Defective mag-

netron

Replace

Check continuity of filament termi-

nal of high voltage transformer

Continuity Defective high

voltage trans-

former

Replace

Check D.C. voltage being sup-

plied to RELAY (RY1) coil

0 V Defective touch

control circuit

Replace

Approx

15 VDC Faulty

contacts or

RELAY (RY1)

or open

relay coil

Replace

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Daewoo KOR-1N4A9W User manual

Brand: Daewoo

Model: KOR-1N4A9W

Category: Microwaves

Type: User manual

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Daewoo KOR-1N4A9W User manual

Daewoo KOR-1N4A9W User manual

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