Daewoo KOC-9Q4T User manual

Service Manual

Microwave Oven

Model: KOC-9Q4T

S/M No. :

Mar. 2010

✔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).

MODEL KOC-9Q3T7S

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

MICROWAVE 1400W

POWER GRILL 1250W

CONSUMPTION CONVECTION 1250W

COMBINATION 2700W

MICROWAVE ENERGY OUTPUT 900W (IEC 705)

MICROWAVE FREQUENCY 2450MHz

OUTSIDE DIMENSIONS (W X D X H) 513X382X311mm(20.2X15X12.2 in.)

CAVITY DIMENSIONS (W X D X H) 354X341X231mm(13.9X13.4X9.1 in.)

NET WEIGHT Approx. 16.6Kg (46.6 lbs.)

TIMER 60 minutes

FUNCTION SELECTIONS Microwave / Grill / Convection / Combination

POWER SELECTIONS 10 LEVELS

CAVITY VOLUME 0.99 Cu. Ft

* SPECIFICATION ARE SUBJECT TO CHANGE WITHOUT NOTICE.

MODEL KOC-9Q4T

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

MICROWAVE 1400W

POWER GRILL 1250W

CONSUMPTION CONVECTION 1250W

COMBINATION 2700W

MICROWAVE ENERGY OUTPUT 900W (IEC 705)

MICROWAVE FREQUENCY 2450MHz

OUTSIDE DIMENSIONS (W X D X H) 513X383X311mm(20.2X15.1X12.2 in.)

CAVITY DIMENSIONS (W X D X H) 354X341X231mm(13.9X13.4X9.1 in.)

NET WEIGHT Approx. 16.6Kg (46.6 lbs.)

TIMER 60 minutes

FUNCTION SELECTIONS Microwave / Grill / Convection / Combination

POWER SELECTIONS 10 LEVELS

CAVITY VOLUME 0.99 Cu. Ft

* SPECIFICATION ARE SUBJECT TO CHANGE WITHOUT NOTICE.

2. SPECIFICATIONS

3. EXTERNAL VIEW

382513

311

1. OUTER DIMENSION

1) KOC-9Q3T7S

383513

311

2) KOC-9Q4T

23 45678

101112

11. DOOR HOOK

Hook automatically locks and holds the door when the door shuts. If the door opens while the oven is operating,

the oven will stop operating immediately.

12. DOOR SEAL

Door seal prevents the microwave leakage from the oven cavity.

13. DOOR VIEWING SCREEN

Food, inside of oven, can be observed through the door viewing screen. It is designed that the microwave cannot

pass through the screen.

14. TOP HEATER

Top heater turns on if any of heater related mode operates.

15. OVEN FRONT PLATE

16. CONVECTION INLET

17. OVEN LAMP

Oven lamp turns on anytime the door opens and oven operates.

18. SAFETY INTERLOCK SYSTEM

19. CONTROL PANEL

10. METAL RACK

11. COUPLER

Coupler located at the center of the oven cavity and it couples between the motor and the glass tray.

12. ROLLER GUIDE

Roller guide must be used anytime with the glass tray.

13. GLASS TRAY

Glass tray is made of special heat resistant glass material. It must be always properly fitted with the coupler and

the roller guide.

2. FEATURE DIAGRAM

11Display : Cooking time, power level, program

indicators and present time are displayed.

MW ( ): When blinking, the oven is

operating in MICROWAVE COOK mode.

Grill ( ): When blinking, the oven is

operating in GRILL mode.

Combi ( ): When blinking, the oven is

operating in COMBI mode.

Convection ( ): When blinking, the oven is

operating in CONVECTION mode.

Defrost ( ): When blinking, the oven is

operating in DEFROST mode.

Auto-cook ( ): When blinking, the oven is

operating in AUTO COOK mode.

Warm ( ): When blinking, the oven is

operating in WARM mode.

Steam Cleaning ( ): When blinking, the

oven is operating in STEAM CLEANING

mode.

gram ( ): When blinking, the oven is

operating in weight input mode.

22Auto cook : Used to cook or reheat.

33Defrost : Used to defrost foods.

44MW : Used to set power level of the

microwave.

55Grill : Used to select grill mode.

66Combi : Used to select combi mode.

77Convection : Used to select convection

mode and selected temp.

88Clock : Used to set clock.

99STEAM CLEANING : Used to clean the

inside of the oven.

00Warm or Dish Warm : Used to keep the food

or dish warm.

qqDial knob : Used to set time, weight and

quantity.

wwSTART/SPEEDY COOK : Used to start a

program or a speedy start(each press adds

30 seconds of microwave cooking time).

eeSTOP/CLEAR : Used to stop the oven

operation or to delete the cooking data.

2) KOC-9Q4T

8. TROUBLESHOOTING 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 load 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.

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

NOTE :

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

Check wire harness, wiring and connection of the terminals and power cord before check the parts listed below.

CONDITION CHECK

Check continuity of

interlock monitor switch with

door closed

(COM↔NC)

Check continuity of

both primary and secondary

interlock switch with door closed

Malfunction of

Interlock

monitor switch

Malfunction of

interlock switch

RESULT

Continuity

No continuity

CAUSE REMEDY

Replace

(COM↔NC)

Fuse blows.

Replace

Shorted contacts

of primary

interlock Switch

Continuity Replace

Check continuity of

primary interlock switch contact with

door partially open until interlock

monitor switch contact close

( COM↔NC close )

Defective low

voltage

transformer

Defective

high voltage

transformer

0 Ωor infinite Replace

Replace

Check continuity of

primary winding of low voltage

transformer

Disconnect high voltage

fuse and operate the unit

Continuity

Approx.

530Ω~ 1130Ω

( normal )

Fuse again

blows

CONDITION CHECK

Check continuity of

magnetron Defective

magnetron.

RESULT

continuity

CAUSE REMEDY

Replace

Outlet has

proper

voltage

fuse does not

blow? Check continuity of noise filter

board Defective line

filter board

continuity Replace

Check continuity of

power supply cord

Defective touch

control circuit Replace

Open power

supply cord

continuity

Replace

NOTE : All these switches must be replaced at the same time, please refer to (7.Interlock mechanism and

adjust) for adjustment instructions

(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

primary interlock switch Malfunction of

primary interlock

switch

RESULT

continuity

CAUSE REMEDY

Adjust or

replace

Turn table

motor and

oven lamp

not turn on

Check D.C voltage

being supplied to

RELAY(RY2) coil

Fault contacts

of RELAY

(RY2) or open

relay coil.

Replace

Check continuity of

secondary interlock

and D.O.M switch

Malfunction of

secondary

Interlock and

D.O.M switch

continuity Adjust or

replace

Defective touch

control Circuit

Approx.

12V DC

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

transformer

Defective

high voltage

fuse

REMEDY

Replace

microwave

oscillation

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

magnetron terminal and

magnetron body

Continuity Defective

magnetron

Check resistance of primary

and secondary coil of high

voltage transformer

0 or Defective

high voltage

transformer

Replace

Check continuity of

high voltage fuse

No microwave oscillation

continuity

Check continuity of

magnetron heater with wires

removed

No continuity Defective

magnetron Replace

Check continuity of filament

terminal of high voltage

transformer

No continuity Defective high

voltage

transformer

Replace

Check D.C voltage

being supplied to

RELAY (RY1) coil

0 V Defective

touch control

circuit

Replace

Approx.

12V DC Faulty contacts of

RELAY

(RY1) or open

relay coil

Replace

(TROUBLE 4)

Grill heater (upper heater) is not heated; food will not become hot.

CONDITION CHECK

Check continuity of

primary interlock switch Malfunction of

primary Interlock

switch

RESULT

continuity

CAUSE REMEDY

Adjust or

replace

Main heater

is not heated.

Check D.C voltage

being supplied to

RELAY (RY3) coil

Faulty contacts of

RELAY

(RY3) or open

relay coil

Replace

Check continuity of

DOM switch Malfunction of

DOM switch

continuity Adjust or

replace

Defective touch

control circuit

Approx.

12V DC

Replace

Check continuity of

heater Defective heater

continuity Replace

(TROUBLE 5)

1) Convection heater is not heated; food will not become hot.

2) Convection fan motor does no rotate.

CONDITION CHECK

Check continuity of

primary interlock switch Malfunction of

primary Interlock

switch

RESULT

continuity Adjust or

replace

1)Sub heater

is not

heated.

2)Convection

fan and

motor does

not rotate.

Check D.C voltage

being supplied to

RELAY (RY4, RY2) coil

Faulty contacts of

RELAY

(RY4, RY2) or

open relay coil

Replace

Check continuity of

DOM switch Malfunction of

DOM switch

continuity Adjust or

replace

Defective touch

control circuit

Approx.

12V DC

Replace

Check continuity of

(heater or motor) Defective heater

or motor

continuity Replace

CONDITION CHECK

Check each button for

continuity of the button Malfunction of

touch control

circuit of control

box sub-assembly

RESULT

Normal

CAUSE REMEDY

Replace

control box

sub-assembly

Display does

not show

programming

at all, even if

keyboard is

touched.

(TROUBLE 6)

The following visual conditions indicate a probable defective touch control Circuit or button P.C.B. assembly

1. Incomplete segments.

1) segment missing

2) partial segments missing

3) digit flickering other than normal fluorescent slight flickering

2. A distinct change in the brightness of one or more numbers exists in the

display.

3. One or more digits in the display are not on when they should be.

4. Display does not count down or up with time cooking or clock operation.

5. Oven is programmable and cooks normally but no display shows.

6. Display obviously jumps in time while counting down.

7. Display counts down noticeably too fast while cooking.

8. Display does not show the time of day when clear button is touched.

9. Oven lamp and turn table motor do not stop although cooking is finished.

Check if the RELAY(RY2) contacts close and if they are close, replace touch control circuit.

CAUSE REMEDY

(TROUBLE 7)

When “ERROR 2 ERROR 3” come on display.

CONDITION CHECK

Check continuity of thermistor

(resistance of thermistor) Replace

RESULT

0Ωor infinite Replace

“ERROR 2 &

ERROR 3”

come on

display

Check continuity of heater

(main, sub)

Defective touch

control circuit Replace

Approx

200k~300kΩ

(room

temperature)

Defective

heater

continuity

Replace

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