Daewoo KOR6LBRR, KOR6LM3RW User Manual

Service Manual

Microwave Oven

Model: KOR-6LZB

May. 2010

PRECA UTIONS T O BE OBSERVED BEFORE AND DURING SER VICING T O AVOID POSSIBLE EXPOSURE T O EXCESSIVE MICROW AVE 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.

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.

(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

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE

EXPOSURE TO EXCESSIVE MICROWAVE ENERGY......................................................................................................1

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

FOR SAFE OPERATION ......................................................................................................................................2

FOR SAFE SERVICE PROCEDURES .................................................................................................................2

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

EXTERNAL VIEW................................................................................................................................................................3

OUTER DIMENSION.............................................................................................................................................3

FEATURES DIAGRAM..........................................................................................................................................4

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

INSTALLATION...................................................................................................................................................................6

OPERATIONS AND FUNCTIONS.......................................................................................................................................7

DISASSEMBLY AND ASSEMBLY......................................................................................................................................8

INTERLOCK MECHANISM AND ADJUSTMENT.............................................................................................................15

TROUBLE SHOOTING GUIDE .........................................................................................................................................16

MEASUREMENT AND TEST ............................................................................................................................................20

MEASUREMENT OF THE MICROWAVE POWER OUTPUT ............................................................................20

MICROWAVE RADIATION TEST .......................................................................................................................21

COMPONENT TEST PROCEDURE...................................................................................................................22

WIRING DIAGRAM............................................................................................................................................................23

PRINTED CIRCUIT BOARD..............................................................................................................................................24

CIRCUIT CHECK PROCEDURE ........................................................................................................................24

PCB CIRCUIT DIAGRAM....................................................................................................................................27

PCB LOCATION NO ...........................................................................................................................................28

EXPLODED VIEW AND PARTS LIST...............................................................................................................................29

DOOR ASSEMBLY .............................................................................................................................................29

CONTROL PANEL ASSEMBLY..........................................................................................................................29

TOTAL ASSEMBLY.............................................................................................................................................29

SAFETY AND PRECA UTIONS

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 by-pass. DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL.

2. FOR SAFE SERVICE PR OCEDURES

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 have excessive emission level 5mW/cm

, the service man should : (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 and CDRH immediately.

CAUTION

MICROWAVE RADIATION

PERSONNEL SHOULD NOT BE EXPOSED TO THE MICROWAVE ENERGY WHICH MAY RADIATE FROM THE MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT IS IMPROPERLY USED OR CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS. WAVEGUIDES FLANGES AND GASKETS MUST BE SECURED. NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED.

CAUTION : This Device is to be Serviced Only by Properly Qualified Service Personnel. Consult the Service

Manual for Proper Service Procedures to Assure Continued Safety Operation and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy.

SPECIFICATIONS

POWER SUPPLY 120V AC, 60Hz SINGLE PHASE WITH GROUNDING

INPUT POWER 1100 W

MICROWAVE ENERGY OUTPUT 700 W

FREQUENCY 2,450MHz OUTSIDE DIMENSIONS (W H D) 17.6 x 10.6 x 12.6 in. CAVITY DIMENSIONS (W H D) 11.6 x 8.6 x 11.9 in. CAVITY VOLUME 0.7 cu.ft NET WEIGHT APPROX. 21.0 lbs. TIMER 59 min. 99 sec. POWER SELECTIONS 10 Levels

* Specifications are subject to change without notice.

EXTERNAL VIEW

1. OUTER DIMENSION

17.6 12.6

10.6

8765 w

234 90q

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

Door seal - The door seal surfaces prevent microwaves escaping from the oven cavity.

Oven cavity

Control panel

Door open button - To open the door push the door open button.

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

Roller guide - This must always be used for cooking together with the glass cooking tray.

Glass 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.

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

Waveguide cover - Protects the microwave outlet from splashes of cooking foods.

Safety interlock system

Oven lamp - Automatically turns on during oven operating.

2. FEATURES DIAGRAM

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

POWER - Used to set power level.

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

DEFROST - Used to defrost foods for weight and time.

CLOCK - Used to set clock.

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

START / +30 SEC - Used to start the oven and also used to set a reheat time.

3. CONTROL PANEL

INSTALLA TION

1. Steady, flat location.

This microwave oven should be set on a steady, flat surface.

2.Leave space behind and side.

All air vents should be kept clear. If all vents are covered during operation, the oven may be overheated and, eventually, cause oven 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 14 amperes, 120Volts, 60Hz grounded outlet.

1. A short power-supply cord is provided to reduce the risks resulting from becoming entangled in or trippping over

a longer cord.

2. Longer cord sets or extension cords are available and may be used if care is exercised in their use.

3. If a long cord or extension cord is used:

1) The marked electrical rating of the cord set or extension cord should be at least as great as the electrical

rating of the appliance.

2) The extension cord must be a grounding type 3-wire cord.

3) The longer cord should be arranged so that it will not drape over the counter top or tabletop where it can be

pulled on by children or tripped over unintentionally.

6. Examine the oven after unpacking f or 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.

OPERATIONS AND FUNCTIONS

1. Connect the mains lead to an electrical outlet.

2. 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.

3. Close the door securely.

4. The oven door can be opened at any time during operation by pushing the door open button on the control panel. The oven will automatically shut off. To restart the oven, close the door and then touch the START pad.

5. Each time a pad is touched, a BEEP will sound to acknowledge the touch.

6. The oven automatically cooks on full power unless set to a lower power level.

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

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

9. When the STOP/CLEAR pad is touched during the oven operation, the oven stops cooking and all information retained. To erase all information (except the present time), touch the STOP/CLEAR pad once more. If the oven door is opened during the oven operation, all information is retained.

10. If the START pad is touched and the oven does not operate, check the area between the door and door seal for

obstructions and make sure the door is closed securely. The oven will not start cooking under the door is completely closed or the program has been reset.

Wattage output chart

The power level is set by touching the Micro Power pad. 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 outlet.

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%

Touch Power pad Power level (Display) Approximate Percentage of Power

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 wear 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 grounded. It is imperative, therefore, to make sure it is grounded properly before beginning repair work.

(2) Warning about the electric charge in the high voltage capacitor.

For about 30 seconds after the operation has stopped, 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 12A fuse is blown 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, take care when 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.

DISASSEMBLY AND ASSEMBLY

1. To remove cabinet

1) Remove three 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.

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