Daewoo KOR-63350S User manual

Service Manual
Microwave Oven
MAR.2000
DAEWOO ELECTRONICS CO., LTD
http ://svc.dwe.co.kr
MODEL : KOR-63350S
KOR-86350S
S/M No. : R63350S001
✔ Caution
: In this Manual, some parts can be changed for improving, their
performance without notice in the parts list. So, if you need the
latest parts information,please refer to PPL(Parts Price List) in
Service Information Center (http://svc.dwe.co.kr).

1
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(KOR-6335/KOR-8635) .............................................................................. 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 ........................................................................................................... 20
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ..................................................... 20
2. MICROWAVE RADIATION TEST ................................................................................................ 21
3. COMPONENT TEST PROCEDURE ............................................................................................ 22
WIRING DIAGRAM .......................................................................................................................... 23
EXPLODED VIEW AND PARTS LIST ............................................................................................. 24
1. DOOR ASSEMBLY ...................................................................................................................... 24
2. CONTROL PANEL ASSEMBLY ................................................................................................... 24
3. TOTAL ASSEMBLY ...................................................................................................................... 24
PRECAUTIONSTOBEOBSERVED BEFOREAND DURINGSERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b)Makethefollowingsafetychecksonallovenstobeservicedbeforeactivatingthemagnetronorothermicrowave
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
droppingorabuse.
(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
transmissionsystemsshall berepaired,replaced, or adjustedbyprocedures describedinthismanual beforethe
oven is released to the owner.
(e)A microwaveleakagecheck toverifycompliancewiththe Federalperformancestandard shouldbeperformedon
eachovenpriortoreleasetotheowner.

2
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 gasket 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 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 manafacterer immediately.
The wire in this mains lead coloured in accordance with the following code.
Green-and-yellow:Earth
Blue : Neartral
Brown. : live
As the colours of the wires in the manins lead of this appliance may not correspond with the coloured makings 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’, earth symbol or coloured green-and-yellow.
The wire which is coloured blue must be connected to the terminals 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
The oven is desigend for counter-top use only.
NOTE

3
SPECIFICATIONS
*SPECIFICATIONSARESUBJECTTOCHANGEWITHOUTNOTICE.
MODEL KOR-6335 KOR-8635
POWER SUPPLY 230V ~ 50Hz, SINGLE PHASE WITH EARTHING
POWER
CONSUMPTION MICROWAVE 1200W 1350W
GRILL
COMBINATION
MICROWAVE ENERGY OUTPUT 800W 900W
MICROWAVE FREQUENCY 2450MHz
OUTSIDE DIMENSIONS(W X H X D) 465 x 279 x 365 mm
(18.3 x 11.0 x 14.4 in.) 495 x 294 x 392 mm (19.5 x 11.6 x 15.4 in.)
CAVITY DIMENSIONS (W X H X D) 290 x 220 x 306 mm
(11.4 x 8.7 x 12.0 in) 320 x 244 x 338 mm (12.6 x 9.6 x 13.3 in)
NET WEIGHT APPROX. 13Kg(28.7 lbs.) APPROX. 15Kg(33.1 lbs.)
TIMER 35min. DUAL SPEED
FUNCTION SELECTIONS MICROWAVE
POWER SELECTIONS 5LEVELS
CAVITY VOLUME 0.7 Cu.Ft. 0.9 Cu.Ft.

4
EXTERNAL VIEW
1. OUTER DIMENSION(KOR-6335/KOR-8635)
2. FEATURE DIAGRAM
1. Safety interlock system
2. Door viewing screen - Allows viewing of food. The screen is designed so that light can pass through, but not the microwave.
3. Door hook -When the door is closed, it will automatically shut. Ifthedoor is opened while the oven operating, the magnetron
will immediately stop operating.
4. Oven cavity
5. Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.
6. Glass cooking tray - Made of special heat resistant glass. Food in a proper receptacle is placed on this tray for cooking.
7. Roller guide - This must always be used for cooking together with the glass cooking tray.
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. Knob V.P.C - Used to select a microwave power level.
10. Knob timer - Used in setting cooking time for all functions.
10
9
8
7
6
23
15 4

5
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 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 6 amperes, 230Volts, 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 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.
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 earthing wire with a
earthing plug. The plug must be plugged into an outlet that is properly installed and earthed.
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.
EARTHING INSTRUCTIONS
WARNING

6
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. Refer to cookbook for recomended
power levels.
5. Determine cooking time.
Consult cookbook for recipe timing.
Oven light turns on and cooling fan starts to operate.
Microwave cooking starts.
6. You may open the door while the oven is operating.
As soon as the door is opened, the safety mechanisms
stop the generation of microwave power and the operation
of cooking timer.
If you wish to change the time during cooking, simply adujst
the timer to the desired time.
7. When the timer reaches zero, a bell will ring and the unit will
turn 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.
Variable power cooking
On and OFF cycle time of mechanical V.P.C switch is 30 seconds.
WhentheV.P.Cknobisset tothedesiredpositionandtimerknobturnstothe desired position, the V.P.C switch has a cycle
(ON/OFF time(sec.)) listed below.
Variable power setting
ON/OFF time (sec.) Approximate Percentage
of power
POWER LEVEL Symbol
KOR-6335 KOR-8635
HIGH MAX MAX 30/0 100 %
MED-HIGH 610W 690W 23.2/6.8 77 %
MEDIUM 440W 490W 16.5/13.5 55 %
DEFROST 260W 290W 9.8/20.2 33 %
WARM 130W 150W 5/25 17 %
1. When setting timer for less than 2 minutes, turn the
timer pass 2 minutes and then return to the correct
timer setting.
2. Various clicking noises may be heard when turning
V.P.C knob. This is normal and does not affect the
operation of your microwave oven.
NOTE
**
Make sure the oven is properly installed and plugged into the electrical outlet.
**

7
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 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 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 12A fuse is blown out 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.
SHORT
Service personnel should remove their watches whenever working close to or replacing the magnetron.
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, HVFuse.
CAUTION
WARNING

8
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 screws which secure the stopper hinge top.
2) Remove the door assembly from top plate of cavity.
3) Reverse the above for reassembly.
3. To remove door parts.
(1) KOR-63350S
REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK
A01 3512203860 FRAME DOOR ABS SG-175 1
A02 3517005630 BARRIER-SCREEN*O SAN 1
A03 3515204100 STOPPER HINGE*T AS KOR-63150S 1
A04 3511705500 DOOR WELD AS KOR-61150S 1
A05 3517002800 BARRIER-SCREEN*I POLYESTER T0.1 1
A06 3512300200 GASKET DOOR PP 1
A07 3513100700 HOOK POM 1
A08 3515101300 SPRING HOOK PW1 1
A06
A05
A04
A02
A01
A03
A07
A08
After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate.
NOTE
✔ Caution: In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the
latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr)

9
(2) KOR-86350S
(1) Remove the gasket door from door plate.
(2) Remove the barrier screen inner from door plate.
(3) Remove the door frame from door plate.
(4) Remove the stopper hinge top from door plate.
(5) Remove the spring and the hook.
(6) Remove the supporter barrier screen outer from door frame.
(7) Remove the barrier screen outer from door frame.
(8) 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.
Tighten a screw.
(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.
Tighten a screw.
REF NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
A01 3512204170 FRAME DOOR ABS SG-175 1
A02 3517005740 BARRIER-SCREEN *O SAN 1
A03 3515204100 STOPPER HINGE *T AS KOR-63150S 1
A04 3511705620 DOOR WELD AS KOR-81250S 1
A05 3517002900 BARRIER-SCREEN *I POLYESTER T0.1 1
A06 3512300400 GASKET DOOR PP 1
A07 3513100700 HOOK POM 1
A08 3515101300 SPRINGHOOK PW1 1
DISASSEMBLY AND ASSEMBLY
B
A
A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm
NOTE
2
✔ Caution: In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the
latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr)

10
5. To remove control panel parts.
(1) KOR-63350S
(2) KOR-86350S
REF NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
B01 3513402650 KNOB VPC ABS XR-401, H-2938 1
B02 3516723720 DECORATOR - PANEL ABS SG-175 1
B03 3515101600 SPRING FLAT SUS 301 T0.5 1
B04 3517400530 COUPLER VPC KNOB POM 1
B05 7122401211 SCREW TAPPING T2S TRS 4 x 12 MFZN 1
B06 3517400400 COUPLER TIMER POM 1
B07 3518203800 TIMER KN35MKD 24E-P 1
B08 7122401211 SCREW TAPPING T2S TRS 4x12 MFZN 1
B09 3513402550 KNOB ABS XR-401 H-2938 1
REF NO. PART CODE PART NAME DESCRIPTION Q'TY REMARK
B01 3513402650 KNOB VPC ABS XR-401, H-2938 1
B02 3516720270 CONTROL - PANEL ABSSG-175 1
B03 3515101600 SPRING FLAT SUS 301 T0.5 1
B04 3517400530 COUPLER VPC KNOB POM 1
B05 7122401211 SCREW TAPPING T2S TRS 4 x 12 MFZN 1
B06 3517400400 COUPLER TIMER POM 1
B07 3518203800 TIMER KN35MKD 24E-P 1
B08 7122401211 SCREW TAPPING T2S TRS 4 x 12 MFZN 2
B09 3513402550 KNOB ABS XR-401 H-2938 1
DISASSEMBLY AND ASSEMBLY
B08
B09
B07B06B05B04B03B02
B01
✔ Caution: In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the
latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr)

11
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 from thee control panel.
3) Remove two screws which secure the timer assembly.
4) Remove the timer assembly.
5) Pull out the timer knob from the timer.
6) Pull out the timer couple from the timer.
7) Remove the screw which secure the V.P.C coupler.
8) Pull out the V.P.C coupler, V.P.C knob and flat spring from the control panel.
9) Remove the door open button and button spring from the control panel.
10) 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 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.
DISASSEMBLY AND ASSEMBLY

12
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.
DISASSEMBLY AND ASSEMBLY
Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave
leakage.Wheneverrepairworkiscarriedoutonmagnetron,checkthemicrowaveleakage.Itshallnotexceed4mW/cm
for a fully assembled oven with door normally closed.
NOTE
2

13
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.
3. Adjustment steps
1) Loosen the one mounting screw.
2) Adjust interlock switch assembly position.
3) Make sure that lock lever moves smothly after adjustment is completed.
4) Tighten completely one mounting screw.
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.
ADJUSTMENT
Microwave emission test should be performed after adjusting interlock mechanism.
If the microwave emission exceed 4mW/cm2 , readjust interlock mechanism.
NOTE

14
TROUBLE SHOOTING GUIDE
Following the procedure below to check if the oven is defective or not.
1. Check grounding before checking trouble.
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) Door shut, timer set, but no cooking takes place.
Doesthe
fuse blow?Check continuityof interlock
monitorswitch withdoorshut.Replace primary, secondary
interlock switch and interlock
monitorswitch.
Replace fuse and check
continuityof both interlock
switch'scontactand monitor
switch'scontactwithdoor
partiallyopen until monitor
switch contact.
Replace primary, secondary
interlock switchand interlock
monitorswitch.
Disconnect one side ofthe
lead wireconnected from
transformertothe high voltage
capacitor,and operateoven.
Replace high
voltage
capacitor.
Replace high
voltage transformer
Ifoutlet has propervoltage,
check continuityof power
supplycord.
Replace power
supplycord.
YES(Refer tonext page)
NO
NO
NO
YES Continuity
NO Continuity
NO Continuity
Bothcontinuity
Normal
Fuseagain
Does the fan motorworkwhen you
shutthe doorand turnthe timer?

15
TROUBLE SHOOTING GUIDE
Does theoven lamplight?
Doestheturntableturn? Replace orrepairoven lamp,
turntablemotor.
If microwave do notoscillate,
check continuityoffilament
of magnetron.
Normal
reading should
be approx.0Ω
Checkcontinuityfilament
tap (3.3V) of high voltage.Replace high
voltage
transformer.
Checkthe diode for
continuityinthe reverse and
normal directions.
Replace high
voltage diode.
Replace
magnetron.
Replace
magnetron.
Meterwith 6Vorhigher
voltage batteries should
be used tocheckthe normal
direction resistanceof
the diode.
Checkthe isolation of
filamentwinding of high
voltage transformer.
Replace high
voltage
transformer.
Good
NO Good
Poor continuity
NO
ContinuityNO Continuity
Continuity
Continuity
Continuity in
the reverse
direction.
NO
YES
YES
Does the fan motorworkwhen you shut
the door and turnthe timer?

16
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(50 3.6 )
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 :
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%.
* 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
P = 4187 X T/t
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(68 3.6 )
CAUTION
+
_
+
_+
_
+
_
+
_+ _

17
MEASUREMENT AND TEST
2. MICROWAVE RADIATION TEST
PROCEDURES
1. Prepare Microwave Energy Survey, 600cc glass
beaker, and glass thermometer 100 (212 ).
2. Pour 275cc15cc of tap water initially at 205(689)
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) When measuring the leakage, always use the 5cm(2 in.)
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.
2
Make sure to check the microwave leakage before and after repair of 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 approch the unit under test until the radiometer readds an appreciable microwave leakage from the unit under the test.
WARNING
+
_+
_+ _

18
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.
MEASUREMENT AND TEST
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WIRING DIAGRAM