Midea MC934XE, KOC-1C0K5S Schematic

Service Manual

Microwave Oven

Model: KOC-1C0K5S

S/M No. :

Jul. 2013

✔ 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

microwave source, and make repairs if 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) 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

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

2. SPECIFICATION ..........................................................................................................................................................3

3. INSTALLATION ...........................................................................................................................................................4

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

5. DISPLAY WINDOW .....................................................................................................................................................6

6. ACCESSORIES ...........................................................................................................................................................7

7. INTERLOCK MECHANISM AND ADJUSTMENT ......................................................................................................8

8. WIRING PROCEDURE ................................................................................................................................................9

9. WIRING DIAGRAM ....................................................................................................................................................10

10. ELECTRICAL PARTS LIST ....................................................................................................................................11

11. DISASSEMBLY AND ASSEMBLY ..........................................................................................................................12

12. COMPONENT TEST PROCEDURE .......................................................................................................................25

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

14. PRINTED CIRCUIT BOARD ...................................................................................................................................34

1. 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, (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 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 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 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.

2. SPECIFICATIONS

MODEL KOC-1C0K5S

POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH earthing

MICROWAVE 1450W

POWER GRILL 1250W

CONSUMPTION CONVECTION 2650W

COMBINATION 2750W, MAX 2900W

MICROWAVE ENERGY OUTPUT 800W (IEC705)

MICROWAVE FREQUENCY 2450MHz

OUTSIDE DIMENSIONS (W X H X D) 524X375X477mm(20.63X14.76X18.78in)

CAVITY DIMENSIONS (W X H X D) 400x233x365mm(15.75x9.17x14.37in)

NET WEIGHT Approx. 25kg(55.06 lbs)

FUNCTION SELECTIONS MICROWAVE/ GRILL/ CONVECTION/ COMBINATION

POWER SELECTIONS 10 LEVELS

CAVITY VOLUME 1.3 Cu.Ft (34ὀ)

* Specifications are subject to change without notice.

3. 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, 230V, 50Hz.

• Power supply cord is about 1.5 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.

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 wire with a earthing plug. The plug must be plugged into an outlet that is properly installed and earthed.

EARTHING INSTRUCTIONS

WARNING

Improper use of the earthing plug can result in a risk of electric shock. Consult a qualified electrician of serviceman 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.

4. CONTROL PANEL

1 Display

The display shows you some information such as cooking time, menu, quantity and temperature and so on.

2 Quick defrost( ) Button

You can defrost a 500 grams of food quickly and easily.

3 Steam cleaning() Button

This function helps you to clean the inside of oven.

4 Deodorization( ) Button

The oven has a special function to blow off smells in the oven.

5 Menu Dial Knob :

You can choose a cooking menu by turning the Menu Dial knob.

6 Control Dial Knob () :

You can enter cooking time, quantity, weight, and temperature by turning the Control Dial knob.

7 Selection() Button: You can confirm the contents

you entered by pressing the Selection button.

8 Start/Speedy Cook () Button:

- You can start cooking immediately by pressing the

Start button after entering cooking information such as cooking time, power level and so on.

- You can start the Microwave cook at power level 10 quickly by pressing the Start button. You can add 30 seconds to the cooking time up to 5 minutes each time the Start button is pressed.

9 Stop/Clear() Button:

It is used for stopping the oven operation or clearing the display.

5. DISPLAY WINDOW

1 Display window

The display shows you some cooking information such as cooking time, clock, temperature, quantity and so on.

2 Icons of cookware

: It means a Grill rack. If lights in the display ,

use a grill rack for cooking.

: It means a Metal tray. If lights in the display ,

use a metal tray for cooking.

3 Icons of operation guide

: It means the Control dial knob. If blinks, turn

the control dial knob.

: It means the Selection button. If blinks, press

the selection button.

: It means the Start button. If blinks, press the

start/speedy cook button.

4 Icons of voice guide function

: It means the Voice guide function. If the voice

guide function is activated, turns on in the display. (OPTIONAL) (Refer to “Setting the volume level” on the page 9.)

5 Icons of cooking menu

: It means Quick defrost. lights in the display

during Quick defrosting.

: It means Steam cleaning. lights in the display

during Steam cleaning.

: It means Deodorization. lights in the display

during Deodorization.

: It means Convection cook. lights in the display

during Convection cooking.

: It means Grill cook. lights in the display during

Grill cooking.

: It means Combination cook. lights in the

display during Combination cooking.

: It means Microwave cook. lights in the display

during Microwave cooking.

: It means Auto defrost. lights in the display

during Auto defrosting.

: It means Auto cook. lights in the display during

Auto cook.

: It means Instant cook. lights in the display

during Instant cook.

: It means Fermentation. lights in the display

during Fermentation.

: It means Memory cook. lights in the display

during Memory cook.

: It means Preheating. lights in the display

during preheating in Convection cooking.

6. ACCESSORIES

This oven is equipped with several accessories. They can be used in various ways to facilitate cooking.

1 Metal Tray - Put food or proper cookware on the metal tray.

2 Grill Rack - Put the grill rack on the metal tray.

It should be always used with the metal tray for cooking.

■ HOW TO USE THE ACCESSORIES OF COOKING

■ Metal Tray

NOTE : Metal Tray is attached to the left cushion.

• Microwave cooking

• Auto defrosting

• Quick defrosting

• Fermentation

• Memory cooking

• Convection cooking

• Auto cook menu: 3, 5

• Instant cook menu: 1, 5

7. INTERLOCK MECHANISM AND ADJUSTMENT

CONDITION : DOOR OPEN

RED/RED

BLACK/BLUE

WHITE/BLUE

WHITE

BLUE

YELLOW

BLUE

LEFT RIGHT

CONDITION : DOOR CLOSE

LEFT RIGHT

INTERLOCK

MONITOR

SWITCH

DOM

SWITCH

HOOK

PRIMARY

INTERLOCK

SWITCH

1 MW RELAY Black & White, Black & White Control M/W

2 HALOGEN HEATER RELAY White & Red, Black Control halogen heater(Side heater)

3 TOP HEATER RELAY White & Black, Black Control heater top

4 CONVECTION RELAY Blue, Blue Control heater back

5 SLOW ACTING RELAY Blue, Blue

6 D.O.M CONNECTOR Blue, Green(Middle), Blue

7 SUB RELAY

8 THERMISTER CONNECTOR White, White Temperature sensor

LOCATION

PART NAME WIRING COLOR FUNCTION

8. WIRING PROCEDURE

MAIN PCB

NO. 1 : Red NO. 3 : White NO. 5 : Black NO. 7 : Blue NO. 9 : Grey

Prevent the current of oven from rising rapidly in Microwave Mode

D.O.M(DOOR OPEN MONITOR) helps the MICOM checking the Interlocking system of DOOR

NO. 1 & 3 : Supply power to PCB NO. 5 : Convection motor NO. 7 : Blower-Motor NO. 9 : Lamp

8 7 6

1 2 3 4

9. WIRING DIAGRAM

CAPACITOR

H.V.

FUSE

H.V.

MAGNETRON

H.V. DIODE

THERMISTOR

TRANSFORMER

HIGH VOLTAGE

SWITCH

NC.

COM.

MONITOR

INTERLOCK

SWITCH

NO.

PRIMARY

INTERLOCK

COM.

THERMAL

STEAM HEATER

THERMAL CUT-OUT

CONVECTION HEATER

CUT-OUT

THERMAL

CUT-OUT

TOP HEATER

CONVECTION HEATER

D.O.M. SWITCH

STEAM HEATER

SWITCH

SECONDARY

INTERLOCK

PTC

CONVECTION

FAN

LAMP

CONTROL P.W.B. ASS'Y

SLOW ACTING

RELAY

HEATER

STEAM

POWER

RELAY

HEATER

TOP

RELAY

HEATER

CONVECTION

RELAY

FAN

RELAY

T/MOTOR

BL:BLUE

GY:GRAY

GN:GREEN

WH:WHITE

YW:YELLOW

BK:BLACK

RD:RED

OL:OVEN LAMP

NOTE :

BR:BROWN

FM:FAN MOTOR

CM:Convection motor

FUSE

LINE FILTER ASS'Y

ONLY

SINGLE PHASE

POWER SUPPLY :

L.V. TRANSFORMER

DOOR : CLOSED

COOK : OFF

[CONDITION]

1 3518302301 CAPACITOR HV 2100VAC 1.10UF #187 80MM 1

2 3518400800 DIODE HV ESJC13-12BX (CL01-12) 1

3 3513601710 LAMP BL 240V 25W T25 CC7A H187 99% 1

4 3512784230 HARNESS MAIN KOC-1C0K5S 1

5 3512783910 HARNESS CONVECTION AS KOC-1C0KKS 1

6 3518701900 FUSE H.V 5kV 0.8A T.H.V. 060T 1

74415A17352 SW MICRO SZM-V16-FA-63 2

84415A66600 SW MICRO SZM-V16-FA-62 1

9 3512808510 HEATER 230V 1200W 1

10 3518125200 TRANS HV R1S58D 1

11 3518606880 NOISE-FILTER DWLF-M27-4 1

12 35113A5Q0T CORD POWER AS 3X1.5 80X80 120-RTML 1.6M 1

13 3518003710 MAGNETRON 2M218HFL 6CF 1

14 3518904000 THERMOSTAT OFF:120 ON:105 V #187 BRAKET 1

15 3518903200 THERMOSTAT OFF:145 ON:135 V #187 BRAKET 1

16 3963513950 MOTOR SHADED POLE 230V 50HZ OEM-10DWC2-T08 1

17 3512808000 HEATER 230V 1400W / 220V 1280W KAWAI 1

18 3963320200 MOTOR BLOWER 220V 60HZ OEB-2505B1 1

NO PART CODE PART NAME SPECIFICATION Q’TY REMARK

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