Daewoo KOC-970T2S, KOC-980T20S, KOC-980T10S, KOC-970T1S User Manual

Service Manual

Microwave Oven

Model: KOC-970T1S KOC-970T2S KOC-980T10S KOC-980T20S

DAEWOO ELECTRONICS CO., LTD.

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAV E 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 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 and latches, (5) Evidence of dropping or abuse.

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

(d) A ny 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 performed on

each oven prior to release to the owner.

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SAFETY AND PRECAUTIONS ........................................................................................................ 2

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

EXTERNAL VIEW ............................................................................................................................ 4

1. OUTER DIMENSION .......................................................................... .......................................... 4

2. FEATURE DIAGRAM .................................................................................................................. 5

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

CONTROL PANEL ........................................................................................................................... 8

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

INTERLOCK MECHANISM AND ADJUSTMENT ............................... ... ..................... .................... 18

TROUBLE SHOOTING GUIDE ........................................................................................................ 19

MEASUREMENT AND TEST ........................................................................................................... 2 5

1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ..................................................... 25

2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH ................................................ 26

3. MICROWAVE RADIATION TEST ................................................................................................ 27

4. COMPONENT TEST PROCEDURE ............................................................................................ 28

WIRING DIAGRAM .................... ... ... ..................... ...................... ..................... ..................... ........... 29

SCHEMATIC DIAGRAM ........................ ... ..................... ........................................ ......................... . 30

EXPLODED VIEWS AND PARTS LIST ........................................................................................... 33

PRINTED WIRING BOARD ............................. ... ... ...................... ..................... ..................... ........... 39

P.C.B. CIRCUIT DIAGRAM ............................. ... ...................... ....................................... ................. 44

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SAFETY AND PRECAUTIO NS

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.

(1) inform the manufacturer, importer or assembler,

(2) repair the unit at no cost to the owner,

(3) attempt to ascertain the cause of the excessive leakage,

(4) 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 immediately.

IMPORTANT

The wire in this mains lead coloured in accordance with the following code. Green-and-yellow : Earth

Blue : Neutral Brown : Live

As the colours of the wires in the m ains 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 m ust be connected to the terminal in the plug which is marked with the letter 'E ' or by earth symbol or 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

This oven is designed for counter-top use only.

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SPECIFICATIONS

MODEL KOC-970T1S KOC-970T2S POW ER S UPP LY 230V~50Hz 230V~50Hz

MICROWAVE 1450W 1450W GRILL 1200W 1200W

POWER CONSUMPTION

MICROW AVE ENERG Y OU TPU T 1000W(IEC705) 1000W(IEC705) MICROW AVE FREQ UEN CY 2450MHz 2450MHz OUT S ID E D IM EN S ION S (W X H X D ) 52 6 x 3 4 5 x 4 1 2 mm ( 20 .7 x 13 .6 x 1 6 .2 in.) CAVITY DIMENSIONS (W X H X D) 335 x 250 x 339 mm (13.2 x 9.8 x 13.3 in.) NET WEIGH T AP PR O X. 19 .5 K g (4 3 lb s.) TIMER 60 minutes FUNCTION SELECTIONS MICROWAVE/GRILL/CONVECTION/COMBI POWER SELECTIONS 10 LEVELS CAV ITY VO L U ME 1.0 C u .F t.

CON VE C T ION 1550W 1550W AUTO C OO K 1850W 1850W COM BINATION 2600W (Simultaneous) 1550W (Sequential)

MOD EL KOC980T10S KOC980T20S POW ER S UPP LY 230V~50Hz 230V~50Hz

MICROW AVE 1450W 1450W GRILL 1200W 1200W

POWER CONSUMPTION

MICROW AVE ENERG Y OU TPU T 1000W(IEC705) 1000W(IEC705) MICROW AVE FREQ UEN CY 2450MHz 2450MHz OUTSIDE D IMENSION S (W X H X D) 526 x 345 x 482 mm (20.7 x 13.6 x 19.0 in.) CAVITY DIMENSIONS (W X H X D) 335 x 250 x 339 mm (13.2 x 9.8 x 13.3 in.) NET W EIGHT APPROX . 21 Kg (46.3 lbs.) TIMER 60 minutes FUNCTION SELECTIONS MICROWAVE/GRILL/C ONVECTION/COMBI POWER SELECTIONS 10 LEVELS CAVITY VOLUM E 1.0 Cu.Ft.

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

CONV ECTION 1550W 1550W AUTO CO O K 1850W 1850W COM BINATION 2600W (Simultaneous) 1550W (Sequential)

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EXTER N AL VIEW

1. OUTER DIMENSION

KOC-970T

KOC980T

Fig.1 Front view

Fig.2 Side view

Fig.1 Front view Fig.2 Side view

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2. FEATURE DIAGRAM

KOC-970T

EXTERNAL VIEW

Door seal

Door hook

the oven is operating, the magnetron will immediately stop operating.

Door viewing screen

Top heater

Oven lamp

Safety interlock system

Control panel

Turntable tray

It can also be used as a cooking utensil.

Oven front plate

10.

Rotating base

It should only be removed for cleaning.

11.

Under heater

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

- When the door is closed, it will automatically shut. If the door is opened while

- Allows viewing of food. The screen is designed so that light can pass through, but not the microwave.

- Turns on when convection, grill and combi cooking is selected.

- Automatically turns on during oven operating.

- Rotates during cooking and ensure even distribution of Microwaves.

- This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all cooking.

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EXTERNAL VIEW

KOC980T

Door seal

Door hook

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

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

the magnetron will immediately stop operating.

Door viewing screen

Top heater

Oven lamp

Safety interlock system

Control panel

Turntable tray

- Turns on when convection, grill and combi cooking is selected.

- Automatically turns on during oven operating.

- Allows viewing of food. The screen is designed so that light can pass through, but not the microwave.

- Rotates during cooking and ensure even distribution of Microwaves.

It can also be used as a cooking utensil.

Oven front plate

10.

Rotating base

- This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all cooking.

It should only be removed for cleaning.

11.

Under heater

12.

Metal rack

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INST ALLA TION

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 13amperes, 230 Volts, 50 Hz.

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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

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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.

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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 a ppliance is equipped with a cord having a earth ing wire with a earthing 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 servicem an if the earthing instructions are not com pletely 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.

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CONTROL PANE L

When blinking, the oven is operating in "C O MBI" cooking mode.

When blinking, the oven is operating in "GRILL" cooking mode.

When blinking, the oven is operating in "MICROWA VE" cooking mode.

When blinking, the oven is operating in "AUTO COO K" cooking m ode.

When blinking, the oven is operating in "PIE" cooking m ode.

When blinking, the oven is operating in "CONVECTION" cooking m ode.

Temperature Button-

Us e d to se t d es ire d tempe ra ture . If th is b u tto n is pre s se d fo r m o re th a n

1.3 sec, number is scrolled up automatically.

Microwave Power Level-

U se d to se lec t th e va ria b le

m icro wave p o w e r le v el. If

this button is pressed for

more than 1.3 sec, number

is sc ro lled up a u to matica lly.

Clock Bu tton-

Us e d to se t tim e

M/W GRILL COMBI

PIE

AUTO

COOK

Grill

Pie

M/W

Defrost

Clock

TEMP COOK

Combi

Temp

Au to Cook

1.Roast Beef

2.Roast Pork

3.Roast Chicken

4.Fish F illets

5.Vegetable

STOP/ CLEAR

TIME/WEIGHT

DEFROST

WEIG H T - TIME

+1min

+10sec

Speedy

START

When blinking, the oven is operating in "WEIGHT DEFRO ST" cooking mode.

When blinking, the oven is operating in "TIME DEFRO ST" cooking mode.

When blinking, the oven is op e ratin g in weg h t inp u t mode.

C o o k ing time is in c r e a s e d by 1 m inute.

C o o k ing time is in c r e a s e d by 10 seconds.

Function Button-

Used to select desired cooking function.

M/W : MICROWAVE Grill De fro s t : T IM E o r WE IGH T

DEFROST

Temp : CONVECTION Combi : COMBINATION Pie Auto Cook

S tart B u tto n-

Us e d to sta rt the s e lec te d cooking cycle.

Speedy Cook B utton-

Us e d to p ro g ra m q u ic kly co ok in g time in 3 0 s e c increments.

Guide Lam p-

W h e n blin kin g , it info rm s y o u to be ready to operate dial kn ob.

Dial Knob-

Us e d to se t the c o o kin g tim e , time of day and w eight input.

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D ISASSEM BLY 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.

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 earthed.

Do not operate on a two-wire extension cord. The microwave oven is designed to be used with earthed. It is imperative, therefore, to makes 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 w atches 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 m icrowave. These parts are as follows - HV Transform er, Magnetron, HV Capacitor, HV D iode.

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DISASSEMBLY AND ASSEM B LY

1. To remove cabinet

(1) Remove four screws on cabinet back. (2) Push the cabinet backward.

2. To remove guide wind assembly

(1) Remove two screws for earthing and for fixing to rear-plate. (2) Remove the noise filter from the guide wind. (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 reassembly.

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3. To remove H.V.transformer

(1) Remove four screws which secure

the H.V.transformer to the base plate. (2) Remove the H.V.transformer. (3) Reverse the above steps for reassembly.

4. To remove hig h vol tag e cap aci tor

(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.

DISASSEMBLY AND ASSEMBLY

High voltage circuit wiring

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DISASSEMBLY AND ASSEM B LY

5. To remove magnetron

(1) Remove three screws which secure the magnetron. (2) Remove the magnetron. (3) Reverse the above steps for reassembly.

CAUTION

Never install the magnetron without the m etallic gasket plate which is packed with each m agnetron to prevent microwave leakage. Whenever repair work is carried out on magnetron, check the m icrowave leakage.

It shall not exceed 4mW /cm

for a fully assembled oven with door normally closed.

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6. To remove control panel assembly

(1) Remove a screw which secure the control panel assembly to

the oven front plate. At the same time, draw forward the control panel

assembly from the oven front plate. (2) Remove the dial knob. (3) Remove nine screws which secure the main and

sub PCB assembly to control panel.

(4) Remove buttons.

(5) Remove the window display and decorator panel.

DISASSEMBLY AND ASSEMBLY

REF NO. PART CODE PART NAME DESCRIPTION QTY REMARK

B01 3511602400 DECO RATOR C-PANEL ABS 1 B02 3515501200 WINDO W D ISPLAY PMM A IF-850 1 SMO G B03 3516715110 CONTROL-PANEL ABS 1 B04 3516906000 BUTTON FUN CTION ABS 1 B05 3516905900 BUTTON FUN CTION ABS 1 KO R-816 B06 3516905800 BUTTON S TART ABS 1 KO R-816 B07 3516906100 BUTTON FUN CTION ABS 1 B08 PKBPMSQ200 PCB SUB AS KOC-970T/980T 1

PKMPMSQ200 PCB MAIN AS KOC-970T1S 1

B09

B10 7121300811 B11 3513403810

PKMPMSQ230 PCB MAIN AS KOC-970T2S 1 PKMPMSYA00 PCB MAIN AS KOC980T10S 1 PKMPMSYA00 PCB MAIN AS KOC980T20S 1

SCREW TAPPING T2S PAN 3x8 MFZN KNOB VOLUME ABS

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9 1 KOR-816

DISASSEMBLY AND ASSEM B LY

7. 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 steps for reassembly.

NOTE

After replacing the door assem bly, perform a check of correct alignm ent with the hinge and cavity front plate.

8. To remove door parts

(1) Remove the gasket door. (4) Remove the hook and spring. (2) Remove two screws. (5) Remove the supporter and barrier-screen *o. (3) Remove the door seal assy. (6) Remove the handle from the frame door.

REF NO. PART CODE PART NAME DESCRIPTION QTY REMARK

A01 3512203320 FRAM E DO OR ABS 1 A02 3512601400 HAND LE DO OR AB S 1 A03 3517004020 BARRIER-SCREEN *O TEMPER ED G LASS T3.2 1 A04 3515304700 SUPPO RTER BAR R-S *O N YLO N 66 1 A05 3511708400 DOOR SEA L AS KOC-971C 1 A06 3513101100 HOOK POM 1 A07 3515101300 SPRING HO O K PW1 1 A08 3515203600 STOPPER HINGE *T AS KOC -970T1S 1 A09 7121400811 SCREW TAPPING T2S PAN 4x8 MFZN 2 A10 3512300800 GASKE T DO OR PB T 1

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