Daewoo KOG-875T0S Service Manual

Service Manual

Microwave Oven

Model : KOG-875T0S

DAEWOO ELECTRONICS CO., LTD. OVERSEAS SER VICE DEPT .

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWA VE 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.

partments, 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.

(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.

TABLE OF CONTENTS

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

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

NAMES AND FUNCTION OF PARTS........................................................................................................................................4

CONTROL PANEL......................................................................................................................................................................5

OPERATION................................................................................................................................................................................6

HOW TO SET THE OVEN CONTROLS.....................................................................................................................................7

INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS...........................................................................................12

PRECAUTIONS FOR DISASSEMBLY AND REPAIR.............................................................................................................14

DISASSEMBLY AND ASSEMBLY............................................................................................................................................15

TROUBLE SHOOTING GUIDE ................................................................................................................................................23

MEASUREMENT ......................................................................................................................................................................29

COMPONENT TEST PROCEDURE........................................................................................................................................31

WIRING DIAGRAM...................................................................................................................................................................32

SCHEMATIC DIAGRAM...........................................................................................................................................................33

EXPLODED VIEWS AND PARTS LIST ...................................................................................................................................35

PRINTED WIRING BOARD...................................................................................................................................................... 36

P.C.B. BOARD DIAGRAM........................................................................................................................................................41

P.C.B. CIRCUIT DIAGRAM ......................................................................................................................................................43

MAIN P.C.B. ASS’Y PART LIST............................................................................................................................................... 44

SUB P.C.B. ASS’Y PART LIST.................................................................................................................................................45

PROPER USE AND SERVICE 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) This microwave oven weight 17.6kg (38.9 lbs.) and must be placed on a horizontal base strong enough to support this weight.

2) The oven should be placed as far from high temperature source and vapour as possible.

3) The power supply cord is about 1.1m (3.6ft) long. Earthing is required when connecting the power source.

4) Maximum power consumption of this oven is approximately 2.7Kw(230V). It is suggested that the unit is operated on such power line (about 13.0 amperes) that can provide more power than this rating.

5) Object must not be placed on the top enclosure so as not to obstruct air flow for ventilation.

The wires 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 mains 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 the 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.

WARNING : This appliance must be earthed.

NOTE : This oven is designed for counter-top use only.

IMPORTANT

POWER SUPPLY 230V ~ , 50Hz, single phase with earthing

POWER CONSUMPTION 1,400 W

MICROWAVE OUTPUT POWER 900 W (IEC 705)

FREQUENCY 2,450 MHZ GRILL POWER CONSUMPTION 1,400 W COMBINATION HEATING POWER CONSUMPTION 2,750 W OUTSIDE DIMENSIONS (W X D X H ) 501 X 320 X 413 mm (19.7 X 12.6 X 16.2 in.) CAVITY DIMENSIONS (W X D X H) 310 X 229 X 320 mm (12.2 X 9.0 X 12.6 in.) NET WEIGHT Approx. 17.6 kg (38.9 lbs.) TIMER 60 min. SELECT FUNCTION Microwave/Grill /Combination Heating MICROWAVE POWER LEVEL 10 stages COMBINATION HEATING LEVEL 3-Levles (Grill + M/W 3-Power levels)

* Specifications subject to change without notice.

Fig. 1 Front View Fig. 2 Side View

SPECIFICATIONS

EXTERNAL VIEWS

1 2

6 3 4 5

M/W GRILL COMBI WEIGHT TIME

DEFROST

KGPROGRAM

COOK

M/W

GRILL

TIME

DEFROST

+1MIN.

WEIGHT

DEFROST

COMBI

SPEEDY

COOK

PROGRAM COOK

1. Roast Beef

2. Roast Pork

3. Roast Chicken

4. Fish Fillets

5. Vegetable

STOP/CLEAE START/CLOCK

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 prevents microwave lekage.

Oven cavity

4 Spatter shield—Protects the microwave outlet from

splashes of cooking foods.

5 Safety interlock system—Prevents the oven from

operating while the door is opened.

Heater—Grill or Combi-Mode has need for the heater.

7 Class 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 of food. The screen is designed so that light can pass through, but not the microwaves.

NAMES AND FUNCTION OF PARTS

CONTROL PANEL

M/W GRILL COMBI WEIGHT TIME

DEFROST

KGPROGRAM

COOK

M/W

GRILL

TIME

DEFROST

+1MIN.

WEIGHT

DEFROST

COMBI

M/W

GRILL

TIME

DEFROST

+1MIN.

PROGRAM

COOK

WEIGHT

DEFROST

COMBI

SPEEDY

COOK

PROGRAM COOK

1. Roast Beef

2. Roast Pork

3. Roast Chicken

4. Fish Fillets

5. Vegetable

STOP/CLEAE START/CLOCK

When blinking, the oven is operating in COMBI cooking.

When blinking, the oven is operating in GRILL

When blinking, the oven is operating in MICROWAVE COOK

When blinking, the oven is operating in PROGRAM

Microwave Power Level-

Used to select the variable microwave power level. If this button is pressed for more than 1.3 seconds, number is scrolled up automatically.

DIAL KNOB-

Used to enter the cooking time and weight input.

Stop/Clear Button-

Used to pause or clear all information manually put into the oven.

Start/Clock Button-

Used to start operation and to set the clock.

Speedy Cook Button-

Used to quickly program cooking time in 30 seconds increments.

Function Button-Used to select desired oven operation.

When blinking, the oven is operating in weight input mode.

When you touch this button. Cooking time is increased by the stop of 1 minute.

When blinking, the oven is operating in WEIGHT DEFROST

MICROWAVE GRILL WEIGHT DEFROST COMBINATION TIME DEFROST +1 MIN PROGRAM COOK

TO STOP THE OVEN WHILE THE OVEN IS OPERATING

1. Press (STOP / CLEAR) button.

- The (STOP) indicator starts blinking.

- You can restart the oven by touching (START) button.

- Touch once more to erase all instruction except clock.

2. Open the door

- You can restart the oven by closing the door and touching button.

ERASING INSTRUCTIONS

• Touch (STOP/CLEAR) button to erase all instructions you set previously.

• Opening the oven door during cooking dose not erase cooking instruction.

• If you touch button during operation, the cooking instructions is all erased.

OPERATION

NOTE : Oven stops operating when door open.

NOTE :

• The time setting has an interval of 10 seconds from 10 seconds to 5 minutes, 30 seconds from 5 minutes to 10 minutes, 1 minute from 10 minutes to 60 minutes.

• At the end of each cooking, the cooling fan will run for time five minutes to cool the oven.(The display will show “cool” then the button is pressed after cooking.) However, you can proceed with further cooking immediately even in this stage.

STOP/CLEAR

■ MICROWAVE COOKING

M/W

NOTE :

• To insure the best microwave and defrost results, be sure to start with a cool oven. This is important if grill, or combination was used prior to microwave cooking. The cooling fan will run for five minutes after the end of cooking.

• The variable power Level settings equal the following wattage.

HOW TO SET THE OVEN CONTROLS

TIPS :

•

Be sure to read the cookbook’s introduction before operating the oven.

• Also remember to read this operating instruction for proper safety information and instruction before using the oven.

• See the cookbook for specific recipes.

• Prior to setting the controls, place one cup of water in the oven, in a heat-proof glass measuring cup, for testing purposes.

• When setting the controls, every time a button is pressed, a beep can be heard.

DISPLAY

P-HI P-80 P-60 P-40 P-20

POWER LEVEL

100%

80% 60% 40% 20%

DISPLAY

P-90 P-70 P-50 P-30 P-10

POWER LEVEL

90% 70% 50% 30% 10%

SETTING THE CONTROLS

2. Press the button to select the desired microwave power level. For example: power level 80 Press button two times more.

3. Turn the DIAL KNOB for the desired cooking time. For example: 18 minutes Turn right or left the DIAL KNOB. Then, 18:00 will show in the disply.

Time can be set up from 10 seconds to 60 munutes.

M/W

4. Press button.

The oven will now start microwave cook for 18 minutes at power level P-80.

5. Four beeps will sound at the end of the cooking time. The indicator light will go off. The display panel will return to the "0". The oven light will turn off and the turntable will stop turning.

START/CLOCK

HOW TO SET THE OVEN CONTROLS

■ TIME DEFROST

SETTING THE CONTROLS

2. Turn the DIAL KNOB for the desired defrosting time.

For example: 18 minutes

Time can be set up from 10 seconds to 60 minutes.

TIME

DEFROST

NOTE : After the defrosting operation, turn the food over after you hear 4 times of 4 beeps for complete defrost.

WEIGHT TIME

DEFROST

3. Press button.

4. Four beeps will sound at the end of the cooking time. The indicator light will go off. The display panel will return to the "0". The oven light will turn off and the tunatable will stop turning.

START/CLOCK

1. Press button.

TIME

DEFROST

M/W

NOTE : If step 2 is omitted, the oven will cook at full power.

NOTE : After the end of microwave cooking, the cooling fan will run for five minutes.

M/W

1. Press button. The display will show “P-HI”.

This oven has 10 power levels from P-HI to P-10.

M/W

SETTING THE CONTROLS

1. Press button.

2. Turn the DIAL KNOB for the desired defrosting weight.

For example : (2.3kg)

3. Press button.

4. The display will show the defrosting time.

START/CLOCK

WEIGHT

DEFROST

WEIGHT TIME

DEFORST

■ WEIGHT DEFROST

WEIGHT

DEFROST

NOTE :• This mode allows you to set weight from 0.1Kg 0.1Kg to 2.9Kg.

•

During the defrosting operation turn over the food after 4 beeps ound 4 times for cpmplete defrosting.

SETTING THE CONTROLS

1. Press button.

2. Turn the dial knob for the desired cooking time

For example : (25 minutes) Time can be set up from 10 seconds to 60 minutes.

3. Press button.

START/CLOCK

Grill

GRILL

■ GRILLING COOKING

Grill

NOTE :• The grilling effect in this oven is similar to that of conventional oven.

•

The heating element is located in the top of the oven.

5. Four beeps will sound at the end of the cooking time. The indicator lights will go off. The display panel will return to the "0". The oven light will turn off and the turntable will stop turning.

NOTE : When the selected operation is over, a cooling fan will run for five minutes.

4. Four beeps will sound at the end of the cooking time. The indicator light will go off. The display panel will return to the "0". The oven light will turn off and the turnatable will stop turning.

NOTE :• There is Pre-Programmed cooking of five menu (1-5)

•

Don’t need to set cooking times, power or function.

NOTE : The menu of pre-programmed cooks equal to the following.

AC-1 ROAST BEEF (1.3Kg) AC-2 ROAST PORK (1.3Kg) AC-3 ROAST CHICKEN (1.3Kg) AC-4 FISH FILLETS (450g) AC-5 VEGETABLE (450g)

See the cooking guide for specific recipes.

SETTING THE CONTROLS

1. Press PROGRAM COOK button Then, “AC-1” will show in the display.

2. Select the desired cooking menu

For example : Roast pork. Press PROGRAM COOK button roast pork. Press PROGRAM COOK button once again then “AC-2” will show in the display.

PROGRAM

COOK

AUTO COOK

3. If you want to select other cooking, touch the button again, until display shows your desired menu.

4. Press button. The oven will now start programmed cook for menu 2. The cookingtime of the menu 2, roast pork, is 37 minutes.

5. The display will show the cooking time.

6. Four beeps will sound at the end of the cooking time. The indicator light wil go off. The display panel will return to the "0". The oven light will turn off and the turntable will stop turning.

START/CLOCK

■ PROGRAM

PROGRAM

COOK

■ TO INTERRUPT THE COOKING CYCLE DURING OPERATION-open the door or press

stop/clear button.

1. The oven will immediately stop.

2. The cooling fan will run for five minutes.

3. If not further cooking required, touch STOP/CLEAR button.

4. The "0" is displayed. If you press stop/clear button during cooling time, the "cool" is displayed.

5. To continue cooking, close the oven door and press button. The oven will restart.

■ GENERAL COOKING HINTS

1. When cooking a roast with an excess amount of drippings, it is helpful to remove the dripping at turnover time to prevent spattering.

2. Prick the meats, fish or poultry with a fork to prevent bursting. Steam builds up pressure in meals, fish or poultry which is tightly covered by a skin or membrane.

3. Reduce suggested cooking times. It is always better to undercook foods rather than to overcook them. If a range of times is stated in a recipe, cook the food at the minimum suggested time, check for doneness, and then cook slightely longer if necessary.

START/CLOCK

■ TIME PLUS

1. Press button. Cooking time is increased by 1 minutes.

•1 min

NOTE : The cooking time increases by 30 seconds from 30 seconds to 5 minutes.

NOTE : • The cooking time can be increased during the oven operation by pressing buttons.

• This function is not valid in speedy cook mode.

SETTING THE CONTROLS

1. Press button.

2. “30” will appear in the display window.

3. Whenever this button is pressed, cooking time is increased by 30 seconds.

START/CLOCK

M/W

■ SPEEDY COOK

SPEEDY

COOK

4. Four beeps will sound at the end of the cooking time. The indicator light will go off. The display panel will return to the "0". The oven light will turn off and the turntable will stop turning.

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 lever downward. The lever press the button of the primary interlock switch to bring it under ‘ON’ condition.

INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS

Mounting screw

Hook

Primary interlock switch

(2) Monitor interlock switch

When the door is closed, the hook pushes the lever forward, and pushes the Latch Lever downward the lever press the button of the interlock monitor switch to bring it under ‘OFF’ condition. The latch Lever press the button on the secondary interlock switch to bring it under ‘ON’ condition.

- Adjustment

Interlock monitor switch

When the door is closed, the monitor switch should be opened before other switches close. When the door is opened, the monitor switch should be closed after other switches open.

Adjustment steps :

a) Loosen the two mounting screws. b) Adjust the interlock switch assembly position. c) Make sure that the latch lever moves smoothly after adjustment is completed. d) Completely tighten the two mounting screws.

+ 32 hidden pages

Daewoo KOG-875T0S Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual