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S/M No. : R631R0S001

Service Manual
Microwave Oven
Model: KOR-631R0S
KOR-861R0S

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) M ake the following safety checks on all ovens to be serviced before activating the m agnetron or other m icrow ave
source, and m ake repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing
surfaces (arcing, wear, and other dam age), (4) Dam age to or loosening of hinges and latches, (5) Evidence of
dropping or abuse.
(c) B efore turning on power to the m icrowave oven for any service test or inspection within the m icrow ave
generating com partm ents, check the m agnetron, wave guide or transm ission line, and cavity for proper
alignm ent, integrity, and connections.
(d) Any defective or m isadjusted com ponents in the interlock, m onitor, door seal, and m icrowave generation and
transm ission system s shall be repaired, replaced, or adjusted by procedures described in this m anual before the
oven is released to the owner.
(e) A m icrowave leakage check to verify com pliance with the Federal perform ance standard should be perform ed on
each oven prior to release to the owner.

SAFETY AND PRECAUTIONS ........................................................................................................... 2
1. FOR SAFE OPERATION .............................................................................................................. 2
2. FOR SAFE SERVICE PROCEDURES ......................................................................................... 2
SPECIFICATIONS ............................................................................................................................... 3
EXTERNAL VIEW................................................................................................................................ 4
1. OUTER DIMENSION..................................................................................................................... 4
2. FEATURE DIAGRAM .................................................................................................................... 5
3. CONTROL PANEL ........................................................................................................................ 6
INSTALLATION ................................................................................................................................... 7
OPERATIONS AND FUNCTIONS....................................................................................................... 8
DISASSEMBLY AND ASSEMBLY...................................................................................................... 9
INTERLOCK MECHANISM AND ADJUSTMENT............................................................................... 16
TROUBLE SHOOTING GUIDE ........................................................................................................... 17
MEASUREMENT AND TEST .............................................................................................................. 21
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ...................................................... 21
2. MICROWAVE RADIATION TEST ................................................................................................. 22
3. COMPONENT TEST PROCEDURE ............................................................................................. 23
WIRING DIAGRAM.............................................................................................................................. 24
PRINTED CIRCUIT BOARD................................................................................................................ 25
1. CIRCUIT CHECK PROCEDURE .................................................................................................. 25
2. P.C.B. CIRCUIT DIAGRAM........................................................................................................... 29
3. P.C.B. LOCATION NO .................................................................................................................. 30
EXPLODED VIEW AND PARTS LIST................................................................................................. 32
1. DOOR ASSEMBLY ....................................................................................................................... 32
2. CONTROL PANEL ASSEMBLY.................................................................................................... 32
3. TOTAL ASSEMBLY....................................................................................................................... 32

SAFETY AND PRECAUTIONS

1. FOR SAFE OPERATION
D am age that allow s the m icrow ave energy (that cooks or heats the food) to escape w ill result in poor cooking and m ay cause
serious bodily injury to the operator.
IF A N Y O F TH E FOLLO W IN G CO N D ITIO N S E X IS T, O P E RATO R M U S T N O T US E TH E A P P LIA N C E .
(O nly a trained service personnel should m ake repairs.)
1) A broken door hinge.
2) A broken door view ing screen.
3) A broken front panel, oven cavity.
4) A loosened door lock.
5) A broken door lock.
The door gasket plate and oven cavity surface should be kept clean.
N o grease, soil or spatter should be allow ed to build up on these surfaces or inside the oven.
D O N OT ATTE M PT TO O P E R ATE THIS A P P LIA N CE W ITH TH E D O O R O P EN . The m icrow ave oven has concealed sw itches
to m ake sure the power is turned off w hen the door is opened. D o not attem pt to defeat them .
D O N OT ATTE M PT TO S E RV IC E TH IS A P P LIA N C E U N TIL Y O U H AVE R E A D THIS S E RV IC E M A NU A L.

2. FOR SAFE SERVICE PROCEDURES
1) If the oven is operative prior to servicing, a m icrowave em ission check should be perform ed prior to servicing the oven.
2) If any certified oven unit is found to servicing, a m icrowave em ission check should be perform ed prior to servicing the oven.
(a) inform the m anufacturer, im porter or assem bler,
(b) repair the unit at no cost to the ow ner,
(c) attem pt to ascertain the cause of the excessive leakage,
(d) tell the ow ner of the unit not to use the unit until the oven has been brought into com pliance.
3) If the oven operates with the door open, the service person should tell the user not to operate the oven and contact the
m anufacturer im m ediately.

IMPORTANT

The w ire in this m ains lead coloured in accordance w ith the follow ing code.

G reen-and-yellow : E arth
B lue : N eutral
B row n : Live

A s the colours of the w ires in the m anins lead of this appliance m ay not correspond w ith the coloured m arkings
identifying the term inals in your plug, proceed as follow s.
The w ire w hich is coloured green-and-yellow m ust be connected to the term ianl in the plug w hich is m arked with the
letter `E ', earth sym bol or coloured green-and-yellow.
The w ire w hich is coloured blue m ust be connected to the term inal which is m arked w ith the letter `N ' or
coloured black.
The w ire w hich is coloured brow n m ust be connected to the term inal w hich is m arked w ith the letter `L' or
coloured red.

NOTE
This oven is designed for counter-top use only.

SPECIFICATIONS

M O D EL K O R -631R KO R -861R

PO W E R SU P PLY 230V -50H z, SIN G LE PH A SE W ITH EA R TH IN G

M IC R O W AVE 1200W 1350W

PO W E R G R ILL
C O N SU M PTIO N
C O M BIN ATIO N

M IC R O W AVE E N E R G Y O U TP U T 800W 900W

M IC R O W AVE F R E Q U E N C Y 2450M H z

O U T S ID E D IM EN SIO N S (W X H X D ) 465 x 279 x 360m m (18.3 x 11.0 x 14.2 in.) 495 x 294 x 388m m (19.5 x 11.6 x 15.3 in.)

C AV IT Y D IM E N S IO N S (W X H X D ) 290 x 220 x 306 m m (11.4 x 8.7 x 12.0 in.) 320 x 244 x 338m m (12.6 x 9.6 x 13.3 in.)

N E T W E IG H T A PP R O X . 13Kg ( 28.7lbs.) AP PR O X. 15Kg ( 33.1lbs.)

TIM ER 59 m in. 00 sec.

FU N C T IO N S ELE C T IO N S M IC R O W AV E

PO W E R SE LE C T IO N S 5 LEV ELS

C AV IT Y VO LU M E 0.7 C u.Ft. 0.9 C u.Ft.

SPECIFICATIONS ARE SUBJECT TO CHANGE W ITHOUT NOTICE.

EXTERNAL VIEW
1. OUTER DIMENSION

EXTERNAL VIEW

2. FEATURE DIAGRAM

1. DOOR SEAL
Door seal surfaces prevent m icrowaves escaping from the oven cavity.
2. DOOR HOOK
W hen door is closed, it will autom atically shut off. If door is opened while oven is operating, m agnetron tube will
im m ediately stop operating.

3. DOOR SCREEN
Allows viewing of food. The screen is transparent to light, but prevents m icrowaves escaping.

4. SPATTER SHIELD
Protects the m icrowave outlet from splashes of cooking foods.

5. OVEN LAMP
Autom atically turns on during oven operating.

6. SAFETY INTERLOCK SYSTEM

7. CONTROL PANEL

8. GLASS COOKING TRAY
M ade of special heat resistant glass. The tray can be easily rem oved for cleaning. M ake sure it is correctly positioned
(indentation) before operating. Place food in a suitable container(dish) on the tray.
9. OVEN FRONT PLATE

10. DOOR OPENING BUTTON
To open the door, push the door opening button.
11. ROLLER GUIDE
Supports the glass cooking tray.

EXTERNAL VIEW

3. CONTROL PANEL

1. Display - Cooking tim e, power level, indicators and present tim e are displayed.

2. Defrost - Used to defrost foods by weight or tim e.

3. Power - Used to set power level.

4. Auto cook - Used to cook using a program or to reheat.

5. Start/Easy cook - Used to start the oven operation and also increase the reheat tim e by 30 seconds.

6. Stop/Clear - Used to stop the oven operation or to erase all entries.

7. Clock - Used to set clock.

8. Dial Knob - Used to set the tim e and weight.

INSTALLATION
1. Steady, flat location
This m icrow ave oven should be set on a steady, flat surface.
This m icrow ave oven is designed for counter top use only.

2. Leave space behind and side
A ll air vents should be kept a clearance. If all vents are covered during operation, the oven m ay overheat and, eventually,
cause failure.

3. A w ay from radio and TV sets
Poor television reception and radio interference m ay 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. A w ay from heating appliances and w ater taps
K eep the oven aw ay from hot air, steam or splash w hen choosing a place to position it, or the insulation m ight be adversely
affected and breakdow ns occur.

5. Power supply
C heck your local pow er source.
This m icrow ave oven requires a current of approxim ately 6 am peres, 230 Volts, 50 H z.
P ow er supply cord is about 0.8 m eters long.
The voltage used m ust be the sam e as specified on this oven. U sing a higher voltage m ay result in a fire or other accident
causing oven dam age. U sing low voltage will cause slow cooking. W e are not responsible for dam age resulting from use
of this oven w ith a voltage of am pere fuse other than those specified.
This appliance is supplied w ith cable of special type, w hich, if dam aged, m ust be repaired w ith cable of sam e type.
S uch a cable can be purchased from DA E W O O and m ust be installed by a Q ualified P erson.

6. Examine the oven after unpacking for any dam age such as:
A m isaligned door, broken door or a dent in cavity.
If any of the above are visible, D O N OT IN S TA LL, and notify dealer im m ediately.

7. D o not operate the oven if it is colder than room temperature
(This m ay occur during delivery in cold w eather.) Allow the oven to becom e room tem perature before operating.

EARTHING INSTRUCTIONS

This appliance m ust be earthed. In the event of an electrical short circuit, earthing reduces the risk of the electric shock by
providing an escape w ire for the electric current. This appliance is equipped with a cord having a earthing wire with a earthing
plug. The plug m ust be plugged into an outlet that is properly installed and earthed.

WARNING
Im proper use of the earthing plug can result in a risk of electric shock. C onsult a qualified electrician or servicem an if
the earthing instructions are not com pletely understood, or if doubt exists as to w hether 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 w ill accept the plug on the appliance. The m arked rating of the extension
cord should be equal to or greater than the electrical rating of the appliance, or D o not use an extension cord.

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. When the oven door is opened, the light turns off.
5. The oven door can be opened at any time during operation by touching the door release button on the control panel.
The oven will automatically shut off. To restart the oven, close the door and then touch Start button.
6. Each time a button is touched, a BEEP will sound to acknowledge the touch.
7. The oven automatically cook on full power unless set to a lower power level.
8. The display will show " when the oven is plugged in.
:0"
9. Time clock returns to the present time when the cooking time ends.
10. When the Stop/Clear button is touched during the oven operation, the oven stops cooking and all information retained.
To erase all information (except the present time), touch the Stop/Clear button once more. If the oven door is opened
during the oven operation, all information is retained.
11. If the Start button is touched and the oven does not operate, check the area between the door and door seal
for obstructions and make sure the door is closed securely.
The oven will not start cooking until the door is completely closed or the program has been reset.

Make sure the oven is properly installed and plugged into the electrical outlet.

Wattage output chart
The power level is set by pressing the Power button. The chart shows the display, the power level and the percentage of power.

Touch Power button Power level (Display) Approximate Percentage of Power
Once P-HI 100 %
Twice P-80 80 %
3 times P-60 60 %
4 times P-40 40 %
5 times P-20 20 %

8
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 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 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.

CAUTION
S ervice personnel should rem ove their w atches w henever working close to or replacing the m agnetron.

WARNING
W hen servicing the appliance, need a care of touching or replacing high potential parts because of electrical shock or
exposing m icrow ave. These parts are as follow s - H V Transform er, M agnetron, H V C apacitor, HV D iode. H V Fuse.

DISASSEMBLY AND ASSEMBLY

1. To remove cabinet

1) Rem ove three screws on cabinet back.
2) Push the cabinet backward.

2. To remove door assem bly

1) Rem ove a screw which secure the stopper hinge top.
2) Rem ove the door assem bly from top plate of cavity.
3) Reverse the above for reassem bly.

NOTE
A fter replacing the door assem bly, perform a check of correct alignm ent with the hinge and cavity front plate.

DISASSEMBLY AND ASSEMBLY

3. To remove door parts.

(1) KOR-631R0S
REF. NO PA RT CODE PART N AME DESCRIPTION Q TY REMARK
A 01 3512203800 FR A M E D O O R A BS X R -401 H -2938 1
A 02 3517003050 BA R R IER -S C RE E N *O A CRY L 1
A 03 3515304610 SU P P O RTE R B AR R -S *O PP 1
A 04 3515204100 ST OP P E R H IN G E *T A S K O R -63150S 1
A 05 3511705500 DO O R W E LD A S K O R -61150S 1
A 06 3517002800 BA R R IER -S C RE E N *I P O LY E S T ER T 0.1 1
A 07 3512300200 GA S K E T D O O R PP 1
A 08 3513100700 HO O K POM 1
A 09 3515101300 SP R IN G H O O K PW1 1

(2) KOR-861R0S
REF. NO PA RT CODE PART N AME DESCRIPTION Q TY REMARK
A 01 3512204100 FR A M E D O O R A BS X R -401 H -2938 1
A 02 3517003150 BA R R IER -S C RE E N *O A CRY L 1
A 03 3515304410 SU P P O RTE R B AR R -S *O PP 1
A 04 3515204100 ST OP P E R H IN G E *T A S K O R -63150S 1
A 05 3511705620 DO O R W E LD A S K O R -81250S 1
A 06 3517002900 BA R R IER -S C RE E N *I P O LY E S T ER T 0.1 1
A 07 3512300400 GA S K E T D O O R PP 1
A 08 3513100700 HO O K POM 1
A 09 3515101300 SP R IN G H O O K PW1 1

DISASSEMBLY AND ASSEMBLY

1) Rem ove the gasket door from door plate.
2) Rem ove the barrier screen inner from door plate.
3) Rem ove the door fram e from door plate.
4) Rem ove the stopper hinge top from door plate.
5) Rem ove the spring and the hook.
6) Rem ove the supporter barrier screen outer from door fram e.
7) Rem ove the barrier screen outer from door fram e.
8) Reverse the above steps for reassem bly.

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

1) To reduce gap located on part `A'.
Loosen a screw 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 two screws.

NOTE

A sm all gap m ay be acceptable if the m icrow ave leakage does not exceed 4m W /cm 2 .

DISASSEMBLY AND ASSEMBLY

5. To remove control panel parts.

(1) KOR-631R0S
REF. NO PART CODE PART NAME DESCRIPTION Q'
TY REMARK
B01 3515501500 WINDOW DISPLAY PMMA 1
B02 3516719420 CONTROL PANEL ABS XR-401 H-2938 1
B03 3516907400 BUTTON FUNCTION ABS 1
B04 3516907600 BUTTON FUNCTION ABS 1
B05 3514321400 PCB SUB AS KOR-631R0S 1
B06 3514321300 PCB MAIN AS KOR-631R0S 1
B07 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3
B08 7621301011 SCREW TAPPING T2 PAN 3X10 PW MFZN 4
B09 3513405210 KNOB VOLUME ABS 1
B10 3516907500 BUTTON FUNCTION ABS 1
B11 3513702700 LEVER DOOR OPEN ABS 1
B12 441G430171 SPRING BUTTON SWP DIA 0.7 1
B13 3516906900 BUTTON DOOR OPEN ABS 1

(2)KOR-861R0S
REF. NO PART CODE PART NAME DESCRIPTION Q'
TY REMARK
B01 3515501500 WINDOW DISPLAY PMMA 1
B02 3516720220 CONTROL PANEL ABS 1
B03 3516907400 BUTTON FUNCTION ABS 1
B04 3516907600 BUTTON FUNCTION ABS 1
B05 3514321400 PCB SUB AS KOR-631R0S 1
B06 3514321500 PCB MAIN AS KOR-861R0S 1
B07 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3
B08 7621301011 SCREW TAPPING T2 PAN 3X10 PW MFZN 4
B09 3513405210 KNOB VOLUME ABS 1
B10 3516907500 BUTTON FUNCTION ABS 1
B11 3513702700 LEVER DOOR OPEN ABS 1
B12 441G430171 SPRING BUTTON SWP DIA 0.7 1
B13 3516906900 BUTTON DOOR OPEN ABS 1
13
DISASSEMBLY AND ASSEMBLY

1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assem bly.
2) Rem ove the door open lever from the control panel.
3) Rem ove four screws which secure the PCB assem bly to control panel.
4) Disconnect m em brane tail from the connector of the PCB assem bly.
5) Detach m em brane from the control panel.
6) Rem ove door open button and button spring from the control panel.
7) Reverse the above steps for reassem bly.

6. To remove high voltage capacitor.

1) Rem ove a screw which secure the grounding ring term inal
of the H.V.diode and the capacitor holder.
2) Rem ove the H.V. diode from the capacitor holder.
3) Reverse the above steps for reassem bly.

High voltage circuit wiring

7. To remove magnetron.

1) Rem ove a screw which secure the m agnetron.
2) Rem ove the m agnetron.
3) Reverse the above steps for reassem bly.

NOTE
N ever install the m agnetron w ithout the m etallic gasket plate w hich is packed w ith each m agnetron to prevent
m icrow ave leakage. W henever repair w ork is carried out on m agnetron, check the m icrow ave leakage. It shall
not exceed 4m W /cm 2 for a fully assem bled oven with door norm ally closed.

DISASSEMBLY AND ASSEMBLY

8. To remove wind guide assembly.
1) Rem ove a screw for earthing.
2) Rem ove the noise filter from the wind guide.
3) Rem ove a screw which secure the wind guide assem bly.
4) Draw forward the wind guide assem bly.
5) Pull the fan from the m otor shaft.
6) Rem ove two screws which secure the m otor shaded pole.
7) Rem ove the m otor shaded pole.
8) Reverse the above steps for reassem bly.

9. To remove H.V.transformer.

1) Rem ove four screws holding the H.V.transform er.
2) Rem ove the H.V.transform er.
3) Reverse the above steps for reassem bly.

INTERLOCK MECHANISM AND ADJUSTMENT
The door lock m echanism is a device which has been specially designed to com pletely elim inate m icrowave radiation when
the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave.

(1) Prim ary interlock switch
W hen the door is closed, the hook locks the oven door. If the door is not closed properly, the oven will not operate.
W hen the door is closed, the hook pushes the button of the m icroswitch. Then the button of the primary interlock switch
bring it under ON condition.

(2) Secondary interlock switch and interlock m onitor switch
W hen the door is closed, the hook pushes the lock lever downward. The lock lever presses the button of the interlock
m onitor switch to bring it under NO condition and presses the button of the secondary interlock switch to bring it under
ON condition.

ADJUSTMENT
Interlock m onitor switch
W hen the door is closed, the interlock m onitor sw itch should be changed(NO condition) before other switches are closed.
W hen the door is opened, the interlock m onitor sw itch should be changed(NC condition) after other switches are opened.

(3) Adjustm ent steps
a) Loosen the one m ounting screw.
b) Adjust interlock switch assem bly position.
c) M ake sure that lock lever m oves sm oothly after adjustm ent is com pleted.
d) Tighten com pletely one m ounting screw.

NOTE
M icrow ave em ission test should be perform ed after adjusting interlock m echanism . If the m icrow ave em ission exceed
4m W /cm 2 , readjust interlock m echanism .

TROUBLE SHOOTING GUIDE
Following the procedure below to check if the oven is defective or not.

1) Check earthing before trouble checking.
2) Be careful of the high voltage circuit.
3) Discharge the high voltage capacitor.
4) W hen checking the continuity of the switches, fuse or high voltage transform er, disconnect one lead wire from these parts
and check continuity with the AC plug removed. To do otherwise m ay result in a false reading or dam age to your meter.

NOTE
W hen electric parts are checked, be sure the pow er cord is not inserted the w all outlet.
C heck w ire harness, w iring and connected of the term inals and power cord before check the parts listed below.

(TROUBLE 1) Oven does not operate at all : any inputs can not be accepted.

C O N D ITIO N CHECK RESULT CAUSE REM EDY

Fuse blow s. C heck co ntinuity of M alfunction R eplace
interlock m onitor sw itch C ontinuity of interlock N O TE 1

w ith door closed m on itor
(C O M N C) sw itch
N o C ontinuity

C heck co ntinuity of both N o C ontinuity M alfunction of R eplace
prim ary and secondary interlock sw itch N O TE 1
interlock sw itch w ith door
colosed C ontinuity

C heck co ntinuity of prim ary C ontinuity S horted contacts R eplace
interlock sw itch contact of prim a ry N O TE 1
w ith door partially open interlock sw itch.
until interlock m onitor switch
contact close
(C O M <->N O )

C heck co ntinuity of 0 or infinite D efective low R eplace
prim ary w inding of low voltage
voltage transform er A pprox. transform er
150~310
(norm al)

D isconne ct high voltage Fuse again D efective high R eplace
fuse and operate the unit blows voltage transform er

TROUBLE SHOOTING GUIDE

CON DITION CHECK RESULT CAUSE REM EDY

O utlet has C heck con tinuity of No D efective R eplace
proper voltage m agn etron C ontinuity m agn etron
Fuse does not
blow. C heck con tinuity of No R eplace
D efective line
noise filter board C ontinuity filter board

C heck con tinuity of No O pen pow er R eplace
pow er supply cord C ontinuity supply cord

N orm al D efective touch A djust
control circuit

NOTE
A ll these sw itches m ust be replaced at the sam e tim e, please refer to "Interlock M echanism A nd A djustm ent".

( TROUBLE 2 ) Display shows all figures selected, but oven does not start cooking, even though desired program and tim e
are set and start pad is tapped.

CON DITION CHECK RESULT CAUSE REM EDY

C heck con tinuity of No M alfunction A djust or
Turn table
m oto r and prim ary interlock sw itch C ontinuity of prim ary replace
oven lam p do interlock
not turn on sw itch

C heck con tinuity of No M alfunction A djust or
secondary interlock and C ontinuity of secondary replace
D .O .M . sw itches interlock and
D .O .M . sw itch

C heck D .C. voltage 0V D efective R eplace
being supplied to touch control
R ELAY (R Y2) coil circuit

A pprox. Faulty R eplace
15 VD C contacts of
R ELAY
(RY 2) or open
relay coil

TROUBLE SHOOTING GUIDE

( TROUBLE 3 ) No m icrowave oscillation even though fan m otor rotates.

C ON DITIO N C HE C K R ES U LT C AU S E R EM ED Y

N o m icrow ave C heck continuity of high N o C ontinuity
oscillation voltage fu se

R epla ce high voltage fuse

C heck continuity of high C ontinuity D efective R eplace
voltage capacito r high voltage
te rm inals w ith w ires transform er
rem oved

C heck continuity of high C ontinuity in D efective R eplace
voltage rectifier in backw ard high voltage
fo rw ard and backw ard direction rectifier
direction w ith D C
m egge r

C onnect m egger leads to C ontinuity D efective R eplace
m agne tron term ina l and m agnetron
m agne tron body

C heck resistance of 0 or D efective R eplace
prim ary and secondary high voltage
coil of high voltage transform er
transfo rm er

C heck continuity of No D efective R eplace
m agne tron w ith w ires C ontinuity m agnetron
rem oved

C heck continuity of No D efective R eplace
filam ent term inal of high C ontinuity high voltage
voltage transform er transform er

C heck D .C . voltage 0V D efective R eplace
being sup plied to touch control
R ELAY (R Y1) coil circuit

A pprox Faulty R eplace
15 V D C contacts or
R ELAY
(RY 1) or open
relay coil

TROUBLE SHOOTING GUIDE

( TROUBLE 4 ) The following visual conditions indicate a probable defective touch control circuit or m em brane switch
assem bly

1. Incom plete segm ents,
1) Segm ents m issing.
2) Partical segm ents m issing.
3) Digit flickering other than norm al display slight
flickering.
4) " : 0 " does not display when power is on.
M /W DEF. Lock g
2. A distinct change in the diplay are not on when they
num bers is the display.

3. One or m ore digits in the diplay are not on when they should be.

4. Display indicates a num ber different from one touched.

5. Specific num bers (for exam ple 2 or 3) will not display when the panel is touched.

6. Display does not count down or up with tim e cooking or clock operation.

7. Oven is program m able and cooks norm ally but no display shows.

8. Display obviously jum ps in tim e while counting down.

9. Display counts down noticeably too fast while cooking.

10. Display does not show the tim e of day when clear pad is touched.

11. Oven lam p and turntable m otor do not stop although cooking is finished. Check if the RELAY 2 contacts close if they are
close, replace touch control circuit.

CON DITION CHECK RESULT CAUSE REM EDY

C heck each pad for N orm al M alfunction R eplace
D isplay does
continuity of the of touch control box
not show m em brane keyboard
program m ing control circuit sub-a ssem bly
for the follow ing
at all, even if of control box
keyboard check
keyboard is proce dure sub-a ssem bly
touched.

A bnorm al M alfunction of R eplace the
the m em brane m em brane
keyboard keyborad

NOTE
B efore following the particular steps listed above in the trouble shooting guide for the m em brane keyboard's, failure,
please check for the continuity of each wire-harness betw een the m em brane keyboard and P.C.B . assem bly.

MEASUREMENT AND TEST
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT

M icrowave output power can be checked by indirectly m easuring the tem perature rise of a certain am ount of water exposed
to the m icrowave as directed below.

PROCEDURE
1. M icrowave power output m easurem ent is m ade with the m icrowave oven supplied at rated voltage and operated at its
m axim um m icrowave power setting with a load of 1000