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Service Manual
Microwave Oven
MODEL : KOG-57470S
KOG-57570S
DAEWOO ELECTRONICS CO., LTD
http : //svc.dwe.co.kr June 2000
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.
(c) Before turning on power to the microwave oven for any service test or inspection within the microwave
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.
(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 ................................................................................................................... 4
INSTALLATION ................................................................................................................................ 5
OPERATIONS AND FUNCTIONS ................................................................................................... 6
DISASSEMBLY AND ASSEMBLY .................................................................................................. 7
INTERLOCK MECHANISM AND ADJUSTMENT ........................................................................... 17
TROUBLE SHOOTING GUIDE ........................................................................................................ 18
MEASUREMENT AND TEST ........................................................................................................... 19
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ..................................................... 19
2. MICROWAVE RADIATION TEST ................................................................................................ 20
3. COMPONENT TEST PROCEDURE ............................................................................................ 21
WIRING DIAGRAM .......................................................................................................................... 22
EXPLODED VIEW AND PARTS LIST ............................................................................................. 23
1. DOOR ASSEMBLY ...................................................................................................................... 23
2. CONTROL PANEL ASSEMBLY ................................................................................................... 23
3. TOTAL ASSEMBLY ...................................................................................................................... 23
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 gasked plate and oven surface should be kept clean.
No greas,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 micrwave oven has concealead switch 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 t
he 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 manafacterer and CDRH innediately.
IMPORTANT
The wire in this mains lead colourred in accordance with the following code.
Green-and-yellow : Earth
Blue : Neartral
Brown. : live
As the colords of the wires in the manins lead of this appliance may not correspond with the coloured makings
identifying the terminals in your plug, proced 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 ` , earth symbol or coloured green-and-yellow.
E'
The wire which is coloured blue must be connected to the terminals which is marked with the letter ` or coloured
N'
black.
he wire which is coloured brown must be with the letter ` or coloured red.
L'
NOTE:
The oven is desigend for counter-top use only.
2
SPECIFICATIONS
MODEL KOG-57470S/57570S
POWER SUPPLY 230V ~ 50Hz, SINGLE PHASE WITH EARTHING
POWER CON- MICROWAVE 1,200 W
SUMPTION
GRILL 1,050 W
COMBINATION 2,200 W
MICROWAVE ENERGY OUTPUT 800 W
MICROWAVE FREQUENCY 2,450 MHz
OUTSIDE DIMENSIONS(W X H X D) 465 x 279 x 360 mm (18.3 x 11.0 x 14.2 in)
CAVITY DIMENSIONS (W X H X D) 290 x 208 x 306 mm (11.4 x 8.2 x 12.0 in)
NET WEIGHT Approx. 14kg (30.9 lbs.)
TIMER 60 min. Dual Speed
FUNCTION SELECTIONS MICROWAVE /GRILL / COMBINATION
POWER SELECTIONS 7 LEVELS
CAVITY VOLUME 0.7 Cu. Ft.
* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
3
EXTERNAL VIEW
1. OUTER DIMENSION
2. FEATURE DIAGRAM
1 2 3 4 5
6
7
8
13 12 11 10 9
1) Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.
2) Cover Heater
3) Heating Element
4) Oven cavity
5) Safety interlock system
6) Knob V.P.C - Used to select microwave poer level.
7) Knob timer - Used in setting cooking time for all functions.
8) Metal Rack
9) Coupler - This fits over the shaft in the center of the ovens cavity floor.
This is to remain in the oven for all cooking.
10) Roller guide - This must always be used for cooking together with the glass cooking tray.
11) Glass cooking tray - Made of special heat resistant glass.
Food in a proper receptacle is placed on this tray for cooking.
12) Door viewing screen - Allows viewing of food.
The screen is designed so that light can pass through, but not the microwave.
13) 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.
4
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 oven failure.
3. Away from Radio and TV sets
Poor television reception and radio interference may result if the oven is located closed to a TV, Radio, antenna or 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 11 amperes, 230Volts, 50Hz grounded outlet.
Power supply cord is about 1.4 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 amprer fuse other than those specified.
This appliance is supplied with cable of special type, which, if samaged, 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 oven to become room temperature before operating.
EARTHING INSTRUCTIONS
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 applicance is equipped with a cord having a reathing wire with a
earthing plug. The plug must be plugged into an outlet that is properly installed ant 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 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 accpt 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.
5
OPERATIONS AND FUNCTIONS
1. Connect the main 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. Choose cooking power level by setting V.P.C knob to
the desired position.
5. Determine cooking time. Consult cookbook for recipe timing.
Oven light turns on and cooling fan starts to operate.
Microwave cooking starts. NOTE
6. You may open the door while the oven is operating.
1. When setting timer for less than 2 minutes, turn the
As soon as the door is opened, the safety mechanisms stop the
timer pass 2 minutes and then return to the correct
generation of microwave power and the operation of cooking
timer setting.
timer. If you wish to change the time during cooking,
2. Various clicking noises may be heard when turning
simply adujst the timer to the desired time.
V.P.C knob. This is normal and does not affect the
7. When the timer reaches zero, a bell will ring and the unit will turn
operation of your microwave oven.
off. Oven light turns off. If additional cooking time is needed and
the door is closed, the oven will automatically start when the timer is reset.
To set MICROWAVE cooking
Set the variable power selector to the desired power level.
POWER LEVEL SYMBOL APPROXIMATE PERCENTAGE OF POWER
HIGH MAX 100%
MED-HIGH 700W 88%
MEDIUM 580W 73%
DEFROST *** 41%
HEAT 26%
To set GRILL cooking
Set the POWER SELECTOR to the (grill) position.
To set COMBI cooking
Set the POWER SELECTOR to the (combi) position.
NOTE
When using the GRILL or COMBI mode;
Do not open the door so open, the temperature inside the oven decrese and the cooking may not be completed in setting time.
Never touch the oven window and metal interior of the oven when taking food in and out, because the temperature inside the
oven and door is very high.
When using these mides, be careful as the tray will be hot to touch, use oven gloves or pot holders while handling tray.
6
DISASSEMBLY AND ASSEMBLY
Cautions to be observed when trouble shooting.
Unlike many other appliances, the microwave oven is 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 scredriver and ware rubber gloves when servicing the high voltage side.
3. Discahrge the high voltage capacitor before touching any oven components or wiring.
(1) Check the grounding.
Do not operate on a 2-wire extension cord.
The microwave oven is designed to be used with 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 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 insulated screwdriver to discharge.
4. When the 15A fuse is blown out due to the operation of the monitor switch;
replace primary interlock switch, secondary interlock switch and interlock
monitor switch. SHORT
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.
CAUTION : When servicing th appliance, need a care of 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.
7
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.
3. To remove door parts.
A01 A02 A03 A04 A05 A06
A13
A07
A14
A08
A12
DOOR ASSEMBLY
KOG-57470S : 3511712140
A11 A10 A09
REF NO. PART CODE PART NAME DESCRIPTION Q'
TY REMARK
A01 3512203850 FRAME DOOR ABS XR-401, H-2938 1
A02 3517005620 BARRIER-SCREEN*O TEMP GLASS T3.2 MIRROR 1
A03 3515204100 STOPPER HINGE*T AS KOR-63150S 1
A04 3511706120 DOOR PAINTING AS KOR-634R0S 1
A05 3517002800 BARRIER-SCREEN*I PE 0.1T 1
A06 3512300200 GASKET DOOR PP 1
A07 3513100730 HOOK POM BLACK 1
A08 3515101310 SPRING HOOK HSW-3 1
A09 7001503310 SCREW MACHINE PAN 5X33 MFZN 2
A10 3512603210 HANDLE DOOR STEEL NI + CR 1
A11 3511601500 DECORATOR LOGO AL T1.5 1
A12 3511604610 DECORATOR DOOR*U STS T0.6 1
A13 3511604600 DECORATOR DOOR*T STS T0.6 1
A14 3516003940 SPECIAL DOUBLE TAPE SI-161 T0.15 27MM 1
8
DISASSEMBLY AND ASSEMBLY
A01 A02 A03 A04 A05 A06
A10 A07
A14
A09 A08
A15
A13
DOOR ASSEMBLY
KOG-57570S : 3511712150
A12 A11
REF NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
A01 3512203850 FRAME DOOR ABS SG-175, SG-0760D 1
A02 3517005620 BARRIER-SCREEN *O TEMP GLASS T3.2 MIRROR 1
A03 3515204100 STOPPER HINGE *T AS KOR-63150S 1
A04 3511706120 DOOR PAINTING AS KOR-634R0S 1
A05 3517002800 BARRIER-SCREEN *I POLYESTER T0.1 1
A06 3512300200 GASKET DOOR PP 1
A07 3513100730 HOOK POM BLACK 1
A08 3515101310 SPRING HOOK HSW-3 1
A09 7122401611 SCREW TAPPING T2S TRS 4X16 MFZN 2
A10 3512603300 HANDLE DOOR *U ABS SG-175, SG-0760D 1
A11 3512603400 HANDLE DOOR *T STS304 T0.6 HAIR LINE 1
A12 3511601500 DECORATOR LOGO AL T1.5 1
A13 3511604610 DECORATOR DOOR *U STS T0.6 1
A14 3511604600 DECORATOR DOOR *T STS T0.6 1
A15 3516003940 SPEICAL DOUBLE TAPE SI-161 T0.15 27MM 1
9
DISASSEMBLY AND ASSEMBLY
(1) Remove the gasket door from door weld as.
(2) Remove the barrier screen inner from door weld as.
(3) Remove the door frame from door weld as.
(4) Remove the stopper hinge top from door weld as.
(5) Remove the spring and the hook.
(6) Remove the barrier screen outer from door frame.
(7) 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'
Loosen two screws on stopper hinge top, and then
push the door to contact the door seal to oven front
surface.
(2) To reduce gap located on part `B'
Loosen two screws on stopper hinge under, and
then push the door to contact the door seal to oven
front surface.
NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm 2
10
DISASSEMBLY AND ASSEMBLY
5. To remove control panel parts.
B01 B02 B03 B04 B05 B06 B07 B08
B12 B11 B10 B09
CONTROL-PANEL ASSEMBLY
KOG-57470S : 3516720350
KOG-57570S : 3516720360
B13
REF NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
B01 3513402650 KNOB VPC ABS XR-401, H-2938 1 KOG-57470S
3513405450 KPG-57570S
B02 3511603930 DECORATOR C-PANEL STS T0.6 1
B03 3516003950 SPEICAL DOUBLE TAPE SI-161 T0.15 1
B04 3516719070 CONTROL-PANEL ABS XR-401, H-2938 1
B05 4415A66910 SW MICRO VP-531A-OF/SZM-V16-FA-61 1
B06 3515101600 SPRING FLAT SUS 301 T0.5 1
B07 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 1
B08 3518205100 TIMER KN60MKD 12E-P 1
B09 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 2
B10 3517400400 COUPLER TIMER POM 1
B11 3517400510 COUPLER VPC KNOB POM 1
B12 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G 1
B13 3513402550 KNOB ABS XR-401, H-2938 1 KOG-57470S
3513405460 KPG-57570S
1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
2) Remove two screws which secure the timer assembly.
3) Remove the timer assembly.
4) Pull out the timer knob from the control panel.
5) Pull out the timer couple from the timer.
6) Remove the screw which secure the V.P.C coupler.
7) Pull out the V.P.C coupler, V.P.C knob and flat spring from the control panel.
8) Remove two switches from the control panel.
9) Remove the decorator c-panel from the control panel.
10) Reverse the above steps for reassembly.
11
DISASSEMBLY AND ASSEMBLY
6. To remove high voltage capacitor.
1) Remove a screw which secure the grounding ring
terminal of the H.V. diode and the capacitor holder.
2) Remove the H.V.diode from the capacitor holder.
3) Reverse the above steps for reassembly.
High voltage circuit wiring
7. To remove magnetron.
1) Remove a screw which secure the magnetron.
2) Remove the magnetron.
3) Reverse the above steps for reassembly.
NOTE : 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/ cm 2 for a fully assembled oven with door normally closed.
12
DISASSEMBLY AND ASSEMBLY
8. To remove wind guide assembly.
1) Remove a screw for earthing.
2) Remove the noise filter from the wind guide.
3) Remove a screw which secure the wind guide assembly.
4) Draw forward the wind guide assembly.
5) Pull the fan from the motor shaft.
6) Remove two screws which secure the motor shaded pole.
7) Remove the motor shaded pole.
8) Reverse the above steps for reasembly.
9. To remove H.V. transformert.
1) Remove four screws holding the H.V.transformer.
2) Remove the H.V.transformer.
3) Reverse the above steps for reassembly.
13
DISASSEMBLY AND ASSEMBLY
10. To remove tray motor.
(1) Remove the coupler in the cavity.
(2) Turn the set upside down.
(3) Cut the tray motor cover part from the base plate.
(4) Remove the tray motor cover.
(5) Remove a screw which secure the tray motor.
(6) Remove the tray motor.
(7) Reverse the above steps for reassembly except for
securing the tray motor cover with screw.
11. To remove heater top assembly.
(1) Remove one side of the heater harness.
(2) Remove a screw which secure the cover insulator top.
(3) Remove the cover insulator top.
(4) Remove the heater top assembly.
(5) Reverse the above steps for reassembly.
14
DISASSEMBLY AND ASSEMBLY
12. To remove heater parts.
C01 C02 C03 C04 C05
HEATER TOP ASSEMBLY : 3512803600
REF NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
C01 3512765100 HARNESS HEATER KOC-970T1S TEFLON 1
C02 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 2
C03 3510607800 BRACKET HEATER *T SBHG T0.5 2
C04 3512803700 HEATER MIRACLON 115V AC 500W 2
C05 3511408100 COVER HEATER *T STS430 T0.5 1
15
INTERLOCK MECHANISM AND ADJUSTMENT
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 microswitch. Then the button of the primary interlock switch
bring it under ON condition.
(2) Secondary interlock switch and interlock monitor switch
When the door is closed, the hook pushes the lock lever downward. The lock lever presses the button of the interlock
monitor switch to bring it under NO condition and presses the button of the secondary interlock switch to bring it under ON
condition.
ADJUSTMENT :
Interlock monitor switch
When the door is closed, the interlock monitor switch should be changed (NO condition) before other switches are closed.
When the door is opened, the interlock monitor switch should be changed (NC condition) after other switches are opened.
(3) Adjustment steps
a) Loosen the one mounting screw.
b) Adjust interlock switch assembly position.
c) Make sure that lock lever moves smothly after adjustment is completed.
d) Tighten completely two mounting screws.
NOTE :
Microwave emission test should be performed after adjusting interlock mechanism.
If the microwave emission exceed 4mW/cm 2, readjust interlock mechanism.
16
TROUBLE SHOOTING 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 lead 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.
Does the fan motor work when you YES ( Refer to next page )
shut the door and turn the timer?
NO
Does the YES Check continuity of interlock Continuity Replace primary, secondary interlock
fuse blow? monitor switch with door shut. switch and interlock monitor switch.
NO NO
Replace fuse and check NO Replace primary, secondary interlock
continuity of both interlock switch and interlock monitor switch.
switch's contact and monitor
switch's contact with door
partially open until monitor
switch contact.
Both continuity
Disconnect one side of the Normal
Replace high voltage capacitor.
lead wire connected from
transformer to the high
voltage capacitor, and operate
oven.
Fuse again
Replace high voltage transformer
If outlet has proper voltage, check NO Continuity
Replace power supply cord.
continuity of power supply cord.
17
TROUBLE SHOOTING GUIDE
Does the fan motor work when you
shut the door and turn the timer?
YES
Does the oven lamp light? NO Replace or repair oven lamp,
Does the turntable turn? turntable motor.
YES
Normal reading
should be
approx. 0
NO
If microwave do not Continuity Check continuity No Continuity Replace high
oscillate, check continuity filament tap (3.3V) Voltage transformer
of filament of magnetron. of high voltage.
Poor continuity Continuity
Continuity in
Check continuity the reverse
direction. Replace high
filament tap (3.3V) Voltage transformer
of high voltage.
Continuity
Replace magnetron
Meter with 6V or higher
voltage batteries should
be used to check the normal
direction resistance of
the diode
Check the isolation of filament NO Continuity Replace high voltage
winding of high voltage
transformer.
transformer.
Good
Replace magnetron
18
MEASUREMENT AND TEST
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT
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 1000 + 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
190mm.
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 A seconds. (Refer to table as following)
Heating time is measured while the microwave generator is operating at full power.
The filament heat-up time for magnetron is not included.
6. The initial and final temperature of water is selected so that the maximum difference between the ambient and final water
temperature is 5K.
7. The microwave power output P in watts is calculated from the following formula :
P = 4187 X T/t
T is difference between initial and ending temperature.
t is the heating time.
_
The power measured should be B (Refer to SPECIFICATIONS) W + 10.0%.
CAUTION :
1. Water load should be measured exactly to 1 liters.
2. Input power voltage should be exactly specified voltage (Refer to SPECIFICATIONS)
_ _
3. Ambient temperature should be 20 + 2 C (68 + 3.6 F)
Heating time for power output :
A(second) 70 64 60 56 52 49 47 44 42 40 38
B(W) 600 650 700 750 800 850 900 950 1000 1050 1100
19
MEASUREMENT AND TEST
2. MICROWAVE RADIATION TEST
CAUTION :
1. Make sure to check the microwave leakage before and after repair of adjustment.
2. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy.
3. Do not place your hands into any suspected microwave radiation field unless the safe density level is known.
4. Care should be taken not to place the eyes in direct line with the source of microwave energy.
5. Slowly approch the unit under test until the radiometer readds an appreciable microwave leakage from the
unit under the test.
PROCEDURES
1. Prepare Microwave Energy Survey, 600cc glass
beaker, and glass thermometer 100 C(212 F).
_ _ _
2. Pour 275cc + 15cc of tap water initially at 20 + 5 C (68 + 9 F) in
the 600cc glass breaker with an inside diameter of approx.
95mm(3.5in.).
3. Place it at the center of the tray and set in a cavity.
4. Close the door and operate the oven.
5. Measure the leakage by using Microwave Energy Survey
Meter with dual ranes, set to 2450MHz.
1) Measured radiation leakage must not exceed the value
prescribed below. Leakage for a fully assembled oven with
door normally closed must be less than 4mW/cm 2.
2) When measuring the leakage, always use the 5cm(2in.)
space cone with probe. Hold the probe perpendicular to
the cabinet and door. Place the space cone of the prove
on the door, cabinet, door seem, door viewing screen, the
exhaust air vents and the suction air vents.
3) Measuring should be in a counter-clockwise direction at a
rate of 1 in./sec. If the leakage of the cabinet door seem is
unknown, move the probe more slowly.
4) 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 in. from
any metal. If it does not, erroneous reading may result.
20
MEASUREMENT AND TEST
3. COMPONENT TEST PROCEDURE
High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle.
It is neither necessary nor advisable to attempt measurement of the high voltage.
Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor.
1. High voltage transformer
(1) Remove connections from the transformer terminals and check continuity.
(2) Normal readings should be as follows:
_
Secondary winding ........................ Approx. 110 + 10%
Filament winding ............................................... Approx. 0
Primary winding ................................................ Approx. 0
2. High voltage capacitor
(1) Check continuity of capacitor with meter on the hightest OHM scale.
(2) A normal capacitor will show continuity for a short time, and then indicate 10M once the capacitor is charged.
(3) A shorted capacitor will show continuous continuity.
(4) An open capacitor will show constant 10M .
(5) Resistance between each terminal and chassis should be infinite.
3. High voltage diode
(1) Isolate the diode from the circuit by disconnecting the leads.
(2) 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 amy be read in both directions.
A normal diode's resistance will be infinite in one direction and several hundred K in the other direction.
4. Magnetron
For complete magnetron diagnosis, refer to " Measurement of the Microwave Power Output ".
Continuity checks can only indicate and open filament or a shorted magnetron.
To diagnose for an open filament or a shorted magnetron.
(1) Isolate magnetron from the circuit by disconnecting the leads.
(2) A continuity check across magnetron filament terminals should indicate 0.1 or less.
(3) A continuity check between each filament terminal and magnetron case should read open.
5. Fuse
If the fuse in the primary and monitor switch circuit is blown when the door is opened, check the primary and monitor
switch before replacing the blown fuse.
In case the fuse is blown by an improper switch operation, replace the defective switch and fuse at the same time.
Replace just the fuse if the switches operate normally.
21
WIRING DIAGRAM
22
EXPLODED VIEW AND PARTS LIST
1. DOOR ASSEMBLY
Refer to Disassembly and assembly.
2. CONTROL PANEL ASSEMBLY
Refer to Disassembly and assembly.
3. TOTAL ASSEMBLY
F01 F02 F03 F04 F05 F06 F07 F08 F09 F10
F54
F53
F52
F51
F50
F49
F11
F48
F12
F47
F13
C00
F46
F45 F14
F44 F15
F43
F16
F17
A00
F18
F19
F20
F21
F22
B00
F23
F24
F25
F42 F41 F40 F39 F38 F37 F36 F35 F34 F33 F32 F31 F30 F29 F28 F27 F26
23
EXPLODED VIEW AND PARTS LIST
REF NO. R PART CODE PART NAME DESCRIPTION SUPPLY REMARK
A00 DOOR AS O
Refer to Disassembly and Assembly
B00 CONTROL-PANEL AS O
C00 3512803600 HEATER *T AS KOG-57350S O
F01 3510801310 CABINET PCM O
F02 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN O
F03 3516111900 CAVITY AS KOG-57350S O
F04 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN O
F05 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN O
F06 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN O
F07 35113A5QJ5 CORD POWER AS 3X1.5 80X80 120-RTML 1.4M O
F08 4413A90012 CLAMP POWER CORD NYLON 66 O
F09 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN O
F10 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN O
F11 4414A25110 250V 15A 65TS O
FUSE
4414A25100 250V 15A MDA15 O
F12 3518606100 NOISE-FILTER DWLF-M13 O
F13 7121403011 SCREW TAPPING T2S PAN 4X30 MFZN O
F14 3963513100 MOTOR SHADED POLE 230V 17W OEM-10DWC2-A07 O
F15 3512517000 GUIDE WIND PP O
F16 3511800300 FAN PP+30%GLASS O
F17 R 3518002200 MAGNETRON 2M218H(F) O
F18 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5X12 DACRO O
F19 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN O
F20 3513003200 HOLDER HV CAPACITOR SECC T0.6 O
F21 R 3518302200 CAPACITOR HV 2100VAC 0.98UF #187 O
F22 R 3518400400 DIODE HV HVR-1X-3AB 12KV #187 O
F23 R 3518701100 FUSE HV 5KV 0.55A HV-41A55-02 O
F24 R 3518116800 TRANS HV DY-N80S0-63T Q O
F25 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN O
F26 3510311700 BASE SBHG T0.8 O
F27 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN O
F28 3512100900 FOOT PP DASF-130 O
F29 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN O
F30 3515201101 STOPPER HINGE *U SCP-1 T2.5 O
F31 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN O
F32 R 3518570400 SWITCH S/A RELAY DWSR-1 O
F33 R 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G O PRIMARY
F34 R 4415A66910 SW MICRO VP-531A-OF/SZM-V16-FA-61 O MONITORY
F35 R 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G O SECONDARY
F36 3513702600 LEVER LOCK POM O
F37 3513811710 LOCK POM BLACK O
24
EXPLODED VIEW AND PARTS LIST
REF NO. R PART CODE PART NAME DESCRIPTION SUPPLY REMARK
F38 3513601600 LAMP BL 240V 25W T25 C7A H187 O
F39 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN O
F40 R 3966310100 MOTOR SYNCRO 220V 2.5W GM-16-24FD12 O
F41 3518905300 THERMOSTAT OFF:75 ON:65 H #187 NB O
F42 3513003400 HOLDER THERMOSTAT PBT O
F43 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN O
F44 4078502031 BUTTON LOCKING PP HONAM A353 O
F45 3511405100 COVER WAVE GUIDE MICA T0.35 O
F46 3517400620 COUPLER XAREC O
* 3512517500 GUIDE ROLLER AS KOR-63150S O
F47 3514700710 ROLLER TEFLON X
F48 3512517300 GUIDE ROLLER PP 5113MF6 A353B X
F49 3517203600 TRAY GLASS O
F50 3517206900 TRAY RACK AS KOG-37150S 110MM O
F51 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN O
F52 3511408200 COVER INSULATOR *T SBHG T0.5 O
F53 3518905900 THERMOSTAT OFF:75 ON:65 V #187 O
F54 7121300611 SCREW TAPPING T2S PAN 3X6 MFZN O
25
DAEWOO ELECTRONICS CO., LTD
686, AHYEON-DONG MAPO-GU
SEOUL, KOREA
C.P.O. BOX 8003 SEOUL, KOREA
TELEX : DWELEC K28177-8
CABLE : " DAEWOOELEC"
FAX : 02)360-7877
TEL : 02)360-7804
E-mail : [email protected]
//
PRINTED DATE : Jun. 2000 SN.R5747570S1