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KOG-37FP0S
Service Manual
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Daewoo KOG-37DP0S, KOG-37FP0S Service Manual

Service Manual
Microwave Oven
Model : KOG-37DP0S
KOG-37FP0S
DAEWOO ELECTRONICS CO., LTD.
S/M No. : G37DP0S001
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.
(c)Before turning on microwave power for any service test or inspection within the microwave generating
com-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
SAFETY AND PRECAUTIONS .......................................................................................................................................2
1. FOR SAFE OPERATION.........................................................................................................................................2
2. FOR SAFE SERVICE PROCEDURES....................................................................................................................2
SPECIFICATIONS............................................................................................................................................................3
EXTERNAL VIEW ............................................................................................................................................................4
1. OUTER DIMENSION................................................................................................................................................4
2. FEATURE DIAGRAM...............................................................................................................................................5
3. CONTROL PANEL...................................................................................................................................................6
INSTALLATION................................................................................................................................................................7
OPERATION AND FUNCTIONS .....................................................................................................................................8
DISASSEMBLY AND ASSEMBLY..................................................................................................................................9
INTERLOCK MECHANISM AND ADJUSTMENT ........................................................................................................18
TROUBLE SHOOTING GUIDE......................................................................................................................................19
MEASUREMENT AND TEST ........................................................................................................................................23
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT..............................................................................23
2. MICROWAVE RADIATION TEST..........................................................................................................................24
3. COMPONENT TEST PROCEDURE .....................................................................................................................25
WIRING DIAGRAM ........................................................................................................................................................26
PRINTED CIRCUIT BOARD..........................................................................................................................................27
1. CIRCUIT CHECK PROCEDURE...........................................................................................................................27
2. P.C.B. CIRCUIT DIAGRAM....................................................................................................................................30
3. P.C.B. LOCATION NO ...........................................................................................................................................31
EXPLODED VIEW AND PARTS LIST...........................................................................................................................32
1. DOOR ASSEMBLY ................................................................................................................................................32
2. CONTROL PANEL ASSEMBLY ............................................................................................................................32
3. TOTAL ASSEMBLY................................................................................................................................................32
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 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 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.
NOTE : This oven is designed for counter-top use only.
MODEL KOG-37DP0S POWER SUPPLY 230V-50Hz, SINGLE PHASE WITH EARTHING
POWER
MICROWAVE 1200W
CONSUMPTION
GRILL 1050W
COMBINATION 2200W MICROWAVE ENERGY OUTPUT 800W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D)
465x279x342mm (18.3x11.0x13.5 in.) CAVITY DIMENSIONS (W X H X D) 290x220x306mm (11.4x8.7x12.0 in.) NET WEIGHT APPROX. 14Kg (30.9 lbs.) TIMER 59 min. 90 sec. FUNCTION SELECTIONS MICROWAVE POWER SELECTIONS 4 LEVELS CAVITY VOLUME 0.7 Cu.Ft.
MODEL KOG-37FP0S POWER SUPPLY 230V-50Hz, SINGLE PHASE WITH EARTHING
POWER
MICROWAVE 1200W
CONSUMPTION
GRILL 1050W
COMBINATION 2200W MICROWAVE ENERGY OUTPUT 800W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D)
465x279x346mm (18.3x11.0x13.6 in.) CAVITY DIMENSIONS (W X H X D) 290x220x306mm (11.4x8.7x12.0 in.) NET WEIGHT APPROX. 14Kg (30.9 lbs.) TIMER 59 min. 90 sec. FUNCTION SELECTIONS MICROWAVE POWER SELECTIONS 4 LEVELS CAVITY VOLUME 0.7 Cu.Ft.
* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
SPECIFICATIONS
1. OUTER DIMENSION
(1) KOG-37DP0S
(2) KOG-37FP0S
EXTERNAL VIEWS
12345
6
7
890qw
1. Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.
2. Reflector (Insulator Heater)
3. Heating Element
4. Oven cavity
5. Safety interlock system
6. Door release button - By pushing this button the latch
system cut off all circuits and stops the oven before the door is opened.
7. Metal Rack
8. Coupler - This fits over the shaft in the center of the
ovens cavity floor. This is to remain in the oven for all cooking.
9. Roller guide - This must always be used for cooking together with the glass cooking tray.
10. Glass cooking tray - Made of special heat resistant gkass. Food in a proper receptacle is placed on this tray for cooking.
11. Door viewing screen - Allows viewing of food. The screen is designed so that light can pass through, but not the microwave.
12. Door hook - When the door is closed, it will automatically shut off. If the door is opened while the oven is operating, the magnetron will immediately stop operating.
2. FEATURE DIAGRAM
M/W
Kitchen
Timer
Stop/Clear Start
Clock
Grill
Combi Grill
1. Small Piece
2. Big Piece
Croissant
KOG-37DP
Auto Def. Grill Combi
Hight Low Warm Timer
g
1
WEIGHT
23
Chicken Piece
Frozen Pizza
Combi
10s.
1min.
1m.
10min.
10m.
1hour
r
ty
u
p
d
e
a
f
s
o
i
13. Display - Cooking time, power level, indicators and present time are displayed.
14. Auto Weight - Used to cook or reheat three foods by setting the weight.
15. Auto weight Defrost - Used to defrost two foods by setting the weight.
16. Weight set pads - Used to set the weight.
17. M/W - Used to set microwave power level.
18. Grill - Used to cook grill.
19. Combination - Used to cook combination.
20. Kitchen Timer - Used to set a minute timer.
21. Clock - Used to set clock.
22. Time set pads - Used to set the cooking time and
the present time.
23. Stop/Clear - Used to stop the oven operation or to erase all entries.
24. Start - Used to start the oven operation.
3. CONTROL PANEL
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 shouls 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 possinle.
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 11 amperes, 220~240 Volts, 50Hz.
• Power supply cord is about 0.8 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 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.
INSTALLATION
EARTHING INSTRUCTIONS
This appliance must be earthed. In the event od 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.
WARNING
Improper use of the earthing plug can result in a risk of electric shock. Consult a qualified electrician or serviceman if the earthing instruction 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.
1. Connect the mains lead to an electrical socket-outlet.
2. After placing the food in a suitable utensil, open the oven door and put it on the glass turntable, Glass turntable must always be in place during cooking.
3. Close the door securely.
4. When the oven door is opened, the light turns off.
5. The oven door can be opened at any time during operation by touching the door release button on the control panel. The oven will automatically shut off. To restart the oven, close the door and then touch START.
6. Each time a pad is touched, a BEEF will sound to acknowledge the touch.
7. The oven automatically cook on full power unless set to a lower power level.
8. The display will show “88 : 88” when the oven is plugged in.
9. Time clock returns to the present time when the cooking time ends.
10. 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.
11. If the START pad is touched and the oven does not operate, check the area between the door and door is closed securely. The oven will not start cooking under the door is not completely closed or the program has not been set.
12. When using the GRILL or COMBI mode ;
• Do not open the door so often, the temperature inside the oven decrease and the cooking may not complete in
setting time.
• Never touch the oven window and metal interior of the oven when taking food in and out, because of the
temperature inside the oven and door is very high.
• When using these modes, be careful as the tray will be hot to touch, use oven gloves or pot holders while
handling tray.
Wattage output chart
The power level is set by pressing the Power pad. The chart shows the display, the power level and the wattage of power.
OPERATIONS AND FUNCTIONS
Make sure the oven is properly installed and plugged into the electrical outlet.
Touch Power pad. Power level (Display) Approximate Wattage of Power
Once HI 800
Twice LOW 470 3 times WARM 140 4 times DEF Tapered
Cautions to be observed when trouble shooting.
Unlike many other appliances, the microwave oven is a 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 begining 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 insulted screw driver to discharge.
4. When the 15A fuse is blown out due to the operation of the monitor switch; replace primary, secondary interlock switch and monitor switch. Refer to next page for the necessary adjustment.
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 repairing the
magnetron.
WARNING :When servicing the appliance, need a care of touching or replacing high potential parts because
of electrical shock or exposing microwave. These parts are as follows-H.V. Transformer, Magnetron, H.V. Capacitor, H.V. Diode.
DISASSEMBLY AND ASSEMBLY
10
1. To remove cabinet.
1) Remove three screws on cabinet back.
2) Push the cabinet backward.
2. To remove door assembly.
1) Remove a screw 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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