DAEWOO KOG-36052S, KOG-36152S, KOG-36252S, KOG-36352S, KOG-36452S Service Manual

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Service Manual

Microwave Oven

Model::KOG-36052S

KOG-36152S KOG-36252S KOG-36352S KOG-36452S

DAEWOO ELECTRONICS CO., LTD.

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 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.

generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connection.

(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 3 SPECIFICATIONS 4 FEATURES DIAGRAM 5 INSTALLATION 6 OPERATION 7 MEASUREMENT OF THE MICROWAVE OUTPUT POWER 8 MICROWAVE RADIATION TEST 9 WIRING DIAGRAM 10 CIRCUIT DESCRIPTION 12 PRECAUTIONS FOR DISASSEMBLY AND REPAIR 14 DISASSEMBLY AND ASSEMBLY 15 INTERLOCK MECHANISM 21 TROUBLE SHOOTING GUIDE 23 COMPONENT TEST PROCEDURE 25 SAFETY INTERLOCK CONTINUITY TEST 26 EXPLODED AND PARTS LIST 27

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

Service Manual for Proper Service Procedures to Assure Continued Compliance with the Federal Performance Standard for Microwave Ovens and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy.

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 SECURE. NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED.

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 seal area and oven cavity surface 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 ascertained oven unit is found to have excessive emission level 5mW/cm2, the service person 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 immediately.

PROPER USE AND SERVICE PRECAUTIONS

SPECIFICATIONS

465

274

D : KOG-36250s (352mm)

KOG-36450s (354mm)

Item Specification

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

MICROWAVE 1200 W

MICROWAVE GRILL 1050 W

COMBINATION 2200 W MICROWAVE ENERGY OUTPUT 800 W MICROWAVE FREQUENCY 2450 MHz OUTSIDE DIMENSIONS (WXHXD) 465X360X274 mm(KOG-36050S/36150S) CAVITY DIMENSIONS (WXHXD) 290X290X220mm NET WEIGHT 14.5 Kg TIMER 35 min. DUAL SPEED FUNCTION SELECTIONS MICROWAVE/GRILL/COMBINATION MICROWAVE POWER LEVELS 3 LEVELS

* Specifications subject to change without notice.

¤ Saftey Interlock System. ¤Ł Door Viewing Screen - Allows viewing of food, the screen is designed so that light can pass through,

but not the microwave.

¤Ø Door Hook - When the door is closed, it will automatically shut. If the door is opened while the oven is

operating, the magnetron will immediately stop operating.

¤Œ Oven Cavity ¤º Door Seal - Door seal maintains the microwave energy within the oven cavity and prevents

microwave leakage.

¤ Glass Cooking Tray - Made of special heat resistant glass. Food in a proper receptacle is placed on

this tray for cooking.

¤ Roller Guide - This must always be used for cooking together with the glass cooking tray. ¤ Coupler - this fits over the shaft in the center of the oven’s cavity floor. This is to remain in the oven

for all cooking.

¤ Knob V.P.C - Used to select a microwave power level. ¤ Knob Timer - Used in setting cooking time for all functions. ¤æ Door Release Button - By pushing this button the latch system cut off all circuits and stops the oven

before the door is opened.

¤ Reflector (Insulator Heater) ¤ Heating Element ¤ Metal Rack

FEATURES DIAGRAM

12 13

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 a clearance. If all vents are covered during operation, the oven may overheat 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, or antenna, feeder and so on.

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 12 amperes, 230V 50Hz. Use a receptacle that will accept the earth prong.

• Voltage Warning The voltage used must be the same as specified on this Microwave 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 Microwave Oven will a voltage or amperage fuse other than those specified.

• Power supply cord is about 1.0 meters long. Do not use an extension cord. If the supply cord is damaged, it must be replaced by the manufacturer or its service agent or a similarly qualified person in order to avoid a hazard;

INSTALLATION

6. Examine the oven after unpacking for any damage such as:

Dents, A misaligned door, Broken door, A dents in cavity. If any of the above are visable, do not install this oven.

CAUTION : Do not under any circumstances cut or remove the round earthing prog from this pulg.

CAUTION : Maintenances works like the replacing of the power cable must be made by a technician

qualified of the after-sales-services.

WARNING : This appliance must be earthed.

This wires in this mains lead are coloured inaccordance 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 the 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.

IMPORTANT

OPERATION

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.

In case the oven is operated in the grill mode, use the Metal Rack and place food on the metal Rack.

3. Shut the door.

Make sure that it is firmly closed.

4. How to set each function.

To set MICROWAVE Cooking.

• Set the variable POWER SELECTOR to desired power level.

To set GRILL Cooking

• Set the POWER SELECTOR to the (gril) position.

To set COMBI Cooking

• Set the POWER SELECTOR to the (combi) position.

5. Set the time control by turning the timer knob and then the oven operate inselected cooking mode.

If turing the timer knob for less than 2 minutes, turn it past 2 minutes and then back to the desired time.

6. The oven will be turned off automatically when the timer point to “OFF”.

Then take out foods.

• To prevent the oven operating with the door open, your is fitted with safety door interlock switches. If you wish to inspect the food during the cooking time, simply open the door. The oven will auto matically stop the cooking. To continue cooking, you simply close the door.

• If you wish to sotp the cooking during the cooking simply turn the timer knob the point “OFF” Cooking can be reset at

any time during the cooking cycle by only turning the timer knob.

• Do not let the timer continue to operate after removing food.

7. NOTE : When using the GRILL (KOG:368(9)OS) 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.

COOKING UTENSILS

Before use, the user should check that tensils are suitable for use in microwave ovens.

SYMBOL POWER LEVLE POWER

DEFORST 33%

MED-HIGH 77%

HIGH 100%

Material

Grill Microwave

cooking cooking

Glass (general) NO Yes(1) Glass (heat resistant) Yes Yes Glass-ceramic and ceramic(heat resistnat) Yes Yes(1) Earthenware Yes Yes China(heat resistant) Yes Yes Plastic(general) No Yes(2) Plastic(heat resistant) Yes(2) Yes(2) Aluminium foil containers/aluminium foil Yes Yes(3) Metal baking tins Yes(4) No Metal (pots. pans, etc) Yes No Paper No Yes

1. Without metal parts or metal trims.

2. Some plastics are heat-proof only to certain temperatures. Check carefully!

3. It is possible to use aluminium foil to shield delicate areas of food (this prevents over-cooking).

4. Metal tins can be used in the combination methods, however if these are very deep, they will greatly reduce the efficiency, as metal shields the microwave energy from the food.

MEASUREMENT OF THE MICROWAVE OUTPUT POWER

Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below.

Procedure

1. Microwave power output measurement is made with the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1,000±5cc of potable water.

2. The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm.

3. The oven and the empty vessel are at ambient temperature prior to the start of the test.

The initial temperature of the water is 10±2˚C(50±3.6˚F). It is measured immediately before the water is added to the vessel. After addition of the water to the vessel, the load is immediately placed on the center of the shelf which is in the lowest normal position.

4. Microwave power is switched on.

5. Heating time should be exactly 52 seconds.

Heating time is measured while the microwave generator is operating at full power. The filament heat-up time for magnetrons is not included.

6. The initial and final water temperatures are selected so that the maximum defference between the ambient and final water temperature is 5K.

7. The microwave power output P in watts is calculated from the following formula:

• ∆T is actual temperature rise.

• t is the heating time. The power measured should be 800W±10%.

CAUTION :

1. Water load should be measured exactly to 1 liters.

2. Input power voltage should be exactly 230 volts as specified.

3. Ambient temperature should be 20±2˚C (68± 3.6˚F)

P = 4187 X ∆ T/t

Water Load

Tray

MICROWAVE RADIATION TEST

WARNING

• Make sure to check the microwave leakage before and after repair or adjustment.

• Always, start measuring of an unknown field to assure safety for operating personnel from microwave energy.

• Do not place your hands into any suspected microwave radiation field unless the safe density level is known.

• Care should be taken not to place the eyes in direct line with the source of microwave energy.

• Slowly approach the unit under test until the radiometer reads an appreaciable microwave leakage from the unit under the test.

Procedure

A) Prepare Microwave Energy Survey Meter, 600cc glass beaker, glass thermometer 100˚C or 212˚F. B) Pour 275cc±15cc of tap water initially at 20±5˚C(68±9˚F) in the 600cc beaker with an inside diameter of approx.

9.5cm (3.5 in). C) Place it at the center of the tray and set it in a cavity. D) Close the door and operate the oven. E) Measure the leakage by using microwave energy survery meter with dual ranges, set to 2450 MHz.

- Measured radiation leakage must not exceed the values prescribed below.

• Leakage for a fully assembled oven with door normally closed must be less than 4mW/cm2.

- When measuring the leakage, always use the 2 in (5cm) space cone with probe. Hold the probe perpendicular

to the cabinet, door. Place the space cone of the probe on the door, cabinet, door seam, door viewing screen, the exhaust air vents and the suction air vents.

- Measuring should be in a counter-clockwise

direction at a rate of 1 inch/sec. If the leakage of the cabinet door seam is unkow, move the prove more slowly.

- When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe

end at the base of the cone does not get closer than 2 inches from any metal. If it does, erroneous reading may result.

WIRING DIAGRAM(SLOW ACTING RELAY)

WIRING DIAGRAM

CIRCUIT DESCRIPTION

1. When the food is placed in the oven cavity and door is closed.

• The contact of the interlock monitor switch open (NO).

• The contacts of the primary interlock switch and secondary interlock switch close.

2. When the timer is set to the time desired.

• The contact of the timer switch close.

• Oven lamp turn on.

• 230V AC is applied to the high voltage transformer.

• Turntable motor start rotating and glass tray rotating.

• Fan motor rotating and cools the magnetron by blowing air.

• Timer motor operating and point to passing cooking time.

• 3.3 Volts AC is generated from the filamente winding of the high voltage transformer. This filament voltage is applied to the magnetron to heat the magnetron filament through two noise preventing choke coils.

• A high voltage of 2000 Volts AC is generated in the secondary of high voltae transformer and this secondary voltage is increased by the action of the diode and the charging of the high voltage capacitor. This resultant D.C voltage is then applied to the anode of the magnetron. As shown in Fig. 2 the first half cycle of the high voltage produces in the high voltage transformer secondary charges the high voltage capacitor. Current flow is in the direction of the dotted-line during the second half cycle, the voltage produced by the transformer secondary, and the charge of the high voltage capacitor are combined and applied to the magnetron as shown by the solid line so that oscillations begins. The disturbance wave generated by the magnetron is prevented by the choke coils of 1.5µH, filter capacitors of 500pF and the magnetron’s shielded case so that TV and radio programs are not impired by noise.

TM CL GM FM

CL GM FM

12A Fuse

Primary Interlock Switch

Timer Switch

COM

Interlock Monitor Switch

Secondary Interlock Switch

Timer Motor Cavity Lamp Geared Motor Fan Motor

Fig. 1

15A Fuse

HIGH VOLTAGE TRANSFORMER

H.V. CAPACITOR

MAGNETRON

RD RD

H.V. DIODE

H.V FUSE

3. When the door is opened during cooking.

• Primary interlock switch and secondary interlock switch open to cut off the primary voltage to the high voltage transformer to stop microwave oscillation.

• Fan motor, timer motor and turntable motor stop rotating.

• Oven lamp turn off.

• As soon as the door is opened, monitor switch close(NC) to create the short circuit. If the contacts of primary interlock switch and secondary interlock switch are both malfunction, the 15A fuse blows open due to the large current surge caused by monitor switch activation.

Fig.2

PRECAUTIONS FOR DISASSEMBLY AND REPAIR

– 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

1. To remove cabinet.

Remove three screws on cabinet back.

2. To remove door assembly.

1) Remove two screws ¤ which secure the stopper hinge top.

2) Remove the stopper hinge top ¤Ł and door assembly ¤Øfrom top plate of cavity.

3) Remove the stopper hinge top ¤Łfrom door assembly.

4) Reverse the above for reassembly taking care to replace fixing glue.

3. To remove door parts.

NOTE : After replacing the door preform a check

of correct alignment with the hinge and cavity front face.

6 3 Door Plate 2 1

(1) Remove the gasket door ¤ from door plate. (2) Remove the barrier screen inner ¤Łfrom door plate. (3) Remove the door frame ¤Øfrom door plate. (4) Remove the spring ¤ºand the hook ¤Œ. (5) Remove the barrier screen outer ¤ from door frame ¤Ø. (6) Reverse the above steps for reassembly.

4. Method to reduce the gap between the door seal and the oven front surface.

(1) To reduce gap located on part ‘A’

1) Loosen two screws on stopper hinge top, and then push the door to contact the door seal to oven front surface.

2) Tighten two screws.

(2) To reduce gap located on part ‘B’.

1) Loosen three screws on bottom hinge, and then the door to contact the door seal to oven front surface.

2) Tighten three screws.

(3) To reduce gap locatated on part ‘C’. (See Fig. A)

1) Loosen a screw on the interlock switch assembly located at the bottom of the oven body.

2) Draw the interlock switch assembly inward as possible to engage with hook on the door bottom.

3) Tighten a screw.

(4) To reduce gap located on part ‘D’. (See Fig. B)

1) Loosen a screw on the interlock switch assembly located at the top of the oven body.

2) Follow step (3) 2) and 3).

Secondary interlock switch

Hook

Mounting screw

Primary interlock switch

Mounting screw

Primary interlock switch

Fig. A

Fig. B

Hook

NOTE: A small gap may be acceptable if the microwave leakage does not exceed 4m W/cm

5. To remove control panel parts.

(1) Remove the screw which secure the control panel,

push up two snap fits and draw forward the control panel assembly.

(2) Remove the door open lever ¤ºfrom the control panel ¤Œ. (3) Remove two screws ¤ıwhich secure the timer assembly ¤ . (4) Remove the timer assembly ¤ . (5) Pull out the timer knob ¤ from the timer assembly ¤ . (6) Pull out the timer coupler ¤ from the timer assembly ¤ . (7) Remove the screw ¤ pull out the switch micro ¤ . (8) Remove the screw ¤æwhich secure the V.P.C. coupler ¤ . (9) Pull out the V.P.C couple ¤ and V.P.C knob ¤Ø from the control panel ¤Œ. (10) Remove the screw ¤ pull out the switch micro ¤ . (11) Remove the door open button ¤ and button spring ¤Łfrom the control panel ¤Œ. (12) Reverse the above steps for reassembly.

6. To remove high voltage capacitor.

(1) Remove a screw ¤ which secure the grounding ring

terminal of the H.V. diode ¤Łand the capacitor holder ¤Ø. (2) Remove the H.V. diode ¤Łfrom the capacitor holder ¤Ø. (3) Reverse the above steps for reassembly.

High voltage circuit wiring

7. To remove magnetron.

(1) Remove three screws ¤ which secure the

magnetron ¤Ł. (2) Remove the magnetron ¤Ł. (3) Reverse the above steps for reassembly.

1 3

Magnetron

H.V. Capacitor

H.V. Transformer

H.V. Diode

8. To remove fan motor assembly.

(1) Remove two screws ¤which secure the back cover¤Łfrom the cavity outer. (2) Remove two screws ¤Øwhich secure the fan motor ¤Œfrom the back cover ¤Ł. (3) Pull out the fan ¤ºfrom the motor ¤Œ. (4) Reverse the above steps for reassembly.

9. To remove transformer.

(1) Remove the four screws ¤holding the H.V.

transformer ¤Ł. (2) Remove the transformer ¤Ł. (3) Reverse the above steps for reassembly.

CAUTION : Never install the magnetron without the metallic gasket plate which is packed with each

magnetron to prevent microwave leakage.

Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 4mW/cm2 for a fully assembled oven with door normally cosed.

Magnetron antenna

Metallic gasket plate

Cooling fin

Filament terminalMagnetron

Magnetron AntennaWave Guide

Metallic Gasket Plate

5 4

NO PART NAME PART CODE Q’TY DESCRIPTION REMARK

10. To remove insulator Heater assembly.

(1) Remove the four HEX Nuts ¤. (2) Remove the Insulator Heater assembly ¤Ł. (3) Reverse the above steps for reassembly.

11. To remove Heater Part.

1 2 3 4 5 6 7

3513301100 3512801700 7002500613 7392500008 7002400413 3515000700

7S627W50X1

1 1 1 1 2 2 2

SPP T0.8 230V 1000W TRS 5X6 MFCR 6N-2-5 SUS TRS 4X4 MFCR C3771BD FLG NUT M5X0.8P MFZN

INSULATOR HEATER HEATER SCREW MACHINE NUT HEX SCREW MACHINE SPACER INSULATOR*I NUT HEX

(1) Remove the HEX Nut ¤Œ. (2) Remove the Insulator Heater ¤and Heater ¤Ł. (3) Remove the two screws ¤º. (4) Reverse the above steps for reassembly.

TOP PLATE

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 button of the micro switch. Then the button of the primary interlock switch bring it under on condition.

ADJUSTMENT 1.

When the door is closed, the switch button is pushed by the hook. The movement of the switch button should exceed 1.2mm measured at the top of the button.

INTERLOCK MECHANISM

Latch

Mounting screw

Button

Primary interlock switch

Hook

1.2mm

(2) Secondary interlock switch and interlock monitor switch

When the door is closed, the hook pushes the push lever down ward, the push lever presse the button of the monitor interlock switch to bring it under “off”, condition and presses the button of the secondary interlock switch to biring it under “on”, condition.

ADJUSTMENT 2.

Interlock monitor switch

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

Secondary interlock switch

The movement of the switch button should exceed 1.2mm measured at the top of the button.

(3) Adjustment steps

a) Loosen the two mounting screws. b) Adjust interlock switch assembly position. c) Confirm the gap(1.2mm) described above. d) Make sure that push lever moves smoothly after adjustments is completed. e) Completely tighten the two mounting screws.

(4) Interlock switch resplacement

Whenever safety interlock switch are replaced :

1) Refer to the following diagram.

2) Check the connection of monitor switch after replacement.

3) Perform the electrical continuity check of interlock switches and microwave emission test mentioned in this manual.

Interlock Monitor Swtich

Push Lever

Hook

Secondary Interlock Switch

NOTE : Microwave emission test should be performed after adjusting interlock machanism. If the

microwave emission exceed 4mW/cm2, readjust interlock mechanism.

SYMBOL COLOR

RD RED

WH WHITE

BK BLACK

BL BLUE

Secondary Interlock Switch

Interlock Monitor Switch

Primary Interlock Switch

RD WH

TROUBLE SHOOTING GUIDE

Does the fan motor work when you shut the door and turn the timer?

Does 12A fuse blow?

Check continuity of interlock monitor switch with door shuted.

Replace fuse

Check continuity of both interlock switch's contact and monitor switch's contact with door partially open until monitor switch contact closes.

Disconnect one side of the lead wire connected from transformer to the high voltage capacitor, and operate oven.

Replace Power supply cord.

Replace primary interlock switch, secondary interlock switch and interlock monitor switch.

*All these switches must be replace at the same time.

Replace H.V.T. Thermal cut-out

Outlet has Proper voltage

Check continuity of H.V.T. Thermal cut-out.

Check continuity of power supply cord.

Replace high voltage transformer

Replace high voltage Capacitor.

Replace primary, secondary interlock switch and interlock monitor switch.

NO continuity

Both continuity

Both no continuity

continuity

YES

Fuse again blows

Normal

One is continuity The other is not.

NO continuity

Trouble Door shut, timer set but no cooking takes place.

Does the fan motor when you shut the door and turn the timer?

YES

NO continuity

NO microwave oscillation.

Check continuity of filament of magnetron.

Does the oven lamp light? Does the turntable turn?

Check continuity of filament of magnetron

Check continuity filament tap (3.3V) of high voltage transformer.

Check the diode for continuity in the reverse and normal directions.

*Do not operate when you check this continuity.

*After short the contacts of a relay, operate oven.

*Normal reading should be approx. 0Ω.

*Meter with 6V or higher voltage batteries should be used to check the normal direction resistance of the diode.

NO GOOD

Poor continuity

Check the isolation of filament winding of high voltage transformer

Faulty magnetron

GOOD

Replace or repair oven lamp, turntable motor.

NO continuity

continuity in the

reverse direction

Replace magnetorn

Check the relay contact of slow acting relay ass'y

NO operate

Replace slow acting relay ass'y

Replace high voltage transformer

Replace high voltage diode.

Replace high voltage transformer

Replace Magnetron

operate

1. High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle.

2. It is neither necessary nor advisable to attempt measurement of the high voltage.

3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor (see page 14).

5. Interlock monitor switch

The interlock switch can be checked with an ohmmeter. Isolate the switch and then connect the meter leads to the common (COM) and normally close (NC) terminals of the switch. The meter should indicate an open circuit with the door closed and a closed circuit with the door opened. In case improper operation is indicated, make the necessary switch adjustment or replacement.

6. Primary and secondary interlock switch

The primary and secondary interlock switch can be checked with an ohmmeter. Isolate the switch and connect the meter leads to the common (COM) and normally open (NO) terminals of the switch. The meter should indicate an open circuit with the door opened and a closed circuit with the door closed. In case improper operation is indicated, make the necessary switch adjustment or replacement.

COMPONENT TEST PROCEDURE

1. High voltage transformer

(A) Remove connections from the transformer

terminals and check continuity.

(B) Normal readings should be as follows:

Secondary winding........Approx. 120Ω¡ 10%

Filament winding...........................Approx. 0Ω

Primary winding.............................Approx. 0Ω

2. High voltage capacitor

(A) Check continuity of capacitor with meter on the

highest OHM scale.

(B) A normal capacitor will show continuity for a short

time, and then indicate 9MΩ once the capacitor is charged.

continuity. (D) An open capacitor will show constant 9MΩ. (E) Resistance between each terminal and chassis

should be infinite.

3. High voltage diode

(A) Isolate the diode from the circuit by disconnecting

the leads.

(B) With the ohmmeter set on the highest resistance

scale, measure the resistance across the diode terminals. Reverse the meter leads and again observe the resistance reading. meter with 6V, 9V or higher voltage batteries should be used to check the front-back resistance of the diode, otherwise an infinite resistance may be read in both directions. A normal diodes resistance will be infinite in one direction and several hundred KΩ in the other direction.

4. Magnetron

For complete magnetron diagnosis, refer to “Measurement of the Microwave Output Power”. (Page 7) Continuity checks can only indicate and open filament or a shorted magnetron. To diagnose for an open filament or shorted magnetron.

(A) Isolate magnetron from the circuit by disconecting

the leads.

(B) A continuity check across magnetron filament

terminals should indicate ohm or less.

and magnetron case should read open.

¥ Disconnect the oven from the power supply. ¥ You can test continuity of safety interlocks and monitor switch by using switch tester or ohmmeter. ¥ The switch operation is checked by the lamp on/off of resistance zero/unlimited. ¥ The sequence of check is interlock monitor switch; primary and secondary interlock switches check. ¥ Make circuits like Fig. a, Fig. b, Fig. c for tests.

SAFETY INTERLOCK CONTINUITY TEST

1) In case of interlock monitor check.

(Lamp on or zero resistance)

(ohmmeter)

– Fig. a –

Condition: 1) Door is opened.

2) Common terminal of the monitor switch disconnected.

3) In case of secondary interlock switch.

(Lamp on or zero resistance)

(ohmmeter)

– Fig. c –

Condition : 1) Door is closed.

2) In case of primary interlock check.

(Lamp on or zero resistance)

(ohmmeter)

– Fig. b –

Condition: 1) Door is closed.

ƒN(Schematic diagram of S/W tester)

POWER SUPPLY CORD

PRIMARY INTERLOCK S/W

NO NO

COM COM

INTERLOCK MONITOR S/W

SECONDARY INTERLOCK S/W

POWER SUPPLY CORD

PRIMARY INTERLOCK S/W

COM

INTERLOCK MONITOR S/W

SECONDARY INTERLOCK S/W

CONTACT

LEAD

LAMP

S/W

BATTERY

EXPLODED AND PARTS LIST

1. Door Assembly

A2 A4A3 A5 A6

REF NO PART CODE PART NAME DESCRIPTION Q’TY REMARK

3517003010 1 KOG-3605 3517003000

BARRIER SCREEN *O PMMA T1.5

1 KOG-3615/35

3517003020 1 KOG-3625 3517003030 1 KOG-3645 3512202500 1 KOG-3605

3512202000 1 KOG-3615/35 3512202010

FRAME DOOR ABS

1 KOG-3625

3512202800 1 KOG-3645

A3 3515201500

STOPPER HINGE *T AS

KOR-61150S 1 A4 3511705500 DOOR WELD AS KOR-61150S 1 A5 3517002800 BARRIER-SCREEN*¥ POLYESTER T0.1 1 A6 3512300200 GASKET DOOR PP 1 A7 3513100700 HOOK POM 1 A8 3515101300 SPRING HOOK PW1 1

DOOR ASSEMBLY : 3511706000 (KOG-3605)

3511706010 (KOG-3615/35) 3511706020 (KOG-3625) 3511706030 (KOG-3645)

REF NO PART CODE PART NAME DESCRIPTION Q’TY REMARK

3516903610 KOG-3605 3516903600

KOG-3615/35

3516903620

BUTTON DOOR OPEN ABS

KOG-3625

3516903630 KOG-3645

4416D55061

BUTTON SPRING

SWPA 1 KOG-3605

441B655072 HSWR 1

KOG-3625/15/35

3513402610 KOG-3605/35

3513402600

KNOB VPC ABS

KOG-3615 3513402620 KOG-3625 3513402640 KOG-3645 3516711400 KOG-3605

3516709800

CONTRON-PANEL ABS 1

KOG-3615/35 3516709810 KOG-3625 3516709820 KOG-3645

3513701400

LEVER DOOR OPEN POM

KOG-3605/15/25/35 3513701410 1 KOG-3645

B6 4415A66910 SW MICRO VP-531A-OF 1 B7 7121301511 SCREW TAPPING T2S PAN 3X15 MFZN 1 B8 4415A17352 SW MICRO VP-533A-OF 1

B9 7121301511 SCREW TAPPING T2S PAN 3X15 MFZN 1 B10 3517400500 COUPLER VPC KNOB POM 1 B11 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 1 B12 3517400400 COUPLER TIMER POM 1

3513402510 KOG-3605/35

B13

3513402500

KNOB ABS 1

KOG-3615 3513402520 KOG-3625 3513402540 KOG-3645

B14 3518203800 TIMER KN35MKD 24E-P 1 B15 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 1 B16 3512764200 HARNESS TIMER KOG-36150S 1

2. Control Panel Ass’y

CONTROL PANEL ASSEMBLY : 3516713840(KOG-3605)

3516713800(KOG-3615) 3516713810(KOG-3625) 3516713880(KOG-3635) 3516716010(KOG-3645)

B16

B10

B11

B12

B15

B14

B13

B4B2

3. Main Unit

REF NO. PART NAME PART CODE DESCRIPTION Q’TY REMARKS

A00 DOOR ASS’Y

EXPLODED AND PART LIST

1 B00 C/PANEL ASS’Y 1 F01 COVER WAVE GUIDE 3511403500 MICA T0.5 1 F02 BUTTON LOCKING 4078502031 PP 2 F03 INSULATOR HEATER AS 3513301400 KOG-36150S 1 F04 COUPLER 3517400600 PPS 1 F05 GUIDE ROLLER AS 3512510600 KOR-61150S 1 F06 TRAY 3517203600 GLASS 1 F07 TRAY RACK AS 3517204410 KOG-361Q0S 99MM 1 F08 CABINET 3510801300 PCM T0.6 1 F09 SCREW TAPPING 7S312X40A1 T1 TRS 4X10 SE MFZN 3 F10 SCREW SPECIAL 3516003700 TT3 FLG HEX 4X8 MFZN 2 F11 NUT HEX 7S627W50X1 FLG NUT M5X0.8P MFZN 2 F12 CAVITY AS 3516104810 KOG-36150S 1 F13 SCREW TAPPING 7122401211 T2S TRS 4X12 MFZN 1 F14 SCREW TAPPING 7121300611 T2S PAN 3X6 MFZN 1 F15 THERMOSTAT 3513902200 OFF:130 ON:115 1 F16 SCREW TAPPING 7112401011 T1 TRS 4X10 MFZN 3 F17 NUT HEX 7S627W50X1 FLG NUT M5X0.8P MFZN 2 F18 CLAMP POWER CORD 4413A90012 NYLON 66 1 F19 CORD POWER AS 35113AAQ95 3X0.75 60X60 120-RTML 1 F20 MAGNETRON 3518002200 2M 218H(MF) I 1 F21 SCREW SPECIAL 3516002700 T2S FLG HEX 4X13 SE MFZN 3 F22 SCREW TAPPING 7S312X40A1 T1 TRS 4X10 SE MFZN 2 F23 SCREW MATCHINE 7601400811 PAN 4X8 PW MFZN 2 F24 COVER *B 3511402500 SBHG T0.8 1 F25 MOTOR SHADED POLE 3963512100 MW10CA-R01 1 F26 FAN 3511800300 PP+30% GLASS 1 F27 SCREW TAPTITE 7272400811 TT3 TRS 4X8 PW MFZN 1 F28 HOLDER HV CAPACITOR 3513001900 SECC T0.8 1 F29 CAPACITOR H.V 441U667020 2100VAC 0.95uF 1 F30 DIODE H.V. 4416V24000 HVR-1X-32B 1 F31 TRANS H.V. 3518106210 JY-N80S0-61T 1 F32 SCREW SPECIAL 3516003700 TT3 TRS 4X8 MFZN 4 F33 SCREW TAPPING 7112401011 T1 TRS 4X10 MFZN 5 F34 BASE 3510308700 SBHG T0.8 1 F35 FOOT 3512100900 PP DASF-130 2 F36 SCREW TAPTITE 7272400811 TT3 TRS 4X8 MFZN 2 F37 STOPPER HINGE *U 3515201101 SCP-1 T2.5 1 F38 SCREW TAPPING 7122401211 T2S TRS 4X12 MFZN 2 F39 SW MICRO 4415A17352 VP-533A-OF 1 F40 SW MICRO 4415A66910 VP-531A-OF 1 F41 SW MICRO 4415A17352 VP-533A-OF 1 F42 LEVER LOCK 3513701300 POM 1 F43 LOCK 3513805700 POM 1 F44 LAMP 3513601600 BL 240V 25W T25 1 F45 NOISE FILTER 3518603700 DWLF-M 1 F46 SCREW TAPPING 7121400611 T2S TRS 4X6 MFZN 2 F47 MOTOR SYNCRO 3966310100 GM-16-24FD12 1 F48 FUSE H.V 3518700900 HV-41A 5KV 0.55A #250 1 F49 SLOW ACTING RELAY 3518570400 DWSR-1 1 for Germany F50 SCREW TAPPING 7122401211 T2S TRS 4X12 MFZN 1

PARTS LIST

S/M NO.:G36052S001

DAEWOO ELECTRONICS CO., L TD.

686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” FAX: 02) 360-8184 TEL: 02) 360-8183

http://www.dwe. daewoo.co.kr

PRINTED DATE: Nov. 1998

DAEWOO KOG-36052S, KOG-36152S, KOG-36252S, KOG-36352S, KOG-36452S Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual