Service Manuals, User Guides, Schematic Diagrams or docs for : Daewoo KOR KOR-636T & 866T KOR-636T & 866T

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KOR-636T & 866T


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 AFETY 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 -636T                                      K O R -866T

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

                       M IC R O W AVE                           1200W                                           1350W
PO W E R
C O N SU M PTIO N      G R ILL

                       C O M BIN ATIO N

M IC R O W AVE E N E R G Y O U TP U T                            850W                                            950W

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 370m m (18.3 x 11.0 x 14.6 in.)       495 x 294 x 403m m (19.5 x 11.6 x 15.9 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 . 13.5K g ( 30.9lbs.)                  AP PR O X. 15Kg ( 33.1lbs.)

TIM ER                                                                                    60m in

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                                                             6 LE VE LS

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 (KOR-636T/KOR-866T)




                                         
                                                                                                            EXTERNAL VIEW



2. FEATURE DIAGRAM




1. DOOR SEAL
   Door seal m aintains the m icrowave within the oven cavity and prevents m icrowave leakage.

2. DOOR HOOK
   W hen door is closed, it will autom atically lock shut. If door is opened while oven is operating, m agnetron tube will
   im m ediately stop operating.

3. DOOR SCREEN
   Allows viewing of food. M icrowave cannot pass through perforations in screen.

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 m ust always be in proper position before operating. Do not cook food
   directly on the tray..

9. OVEN FRONT PLATE

10. COUPLER
    This fits over the shaft in the center of the ovens cavity floor. This is to rem ain in the oven for all cooking.
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. Clock - Used to set clock.

3. Start/Easy Cook - Used to start operation, also for easy start (each press adds 30 seconds easy cooking tim e).

4. Stop/Clear - Used to stop the operation or to delete the cooking data.

5. Auto Cook - Used to cook using a program .

6. Knob - Turn to set the cooking m enu and select a m icrowave power level.

7. Knob - Dial for setting tim e and weight.(You can also extend the tim e of the current operation by 1 m inute by turning the
          dial knob, except defrosting)




                                                               
 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 m ain 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 m ust always
   be in place during cooking.
3. Close the door securely.
4. W hen the oven door is opened, the light turns off.
5. The oven door can be opened at any tim e during operation.
   The oven will autom atically shut off. To restart the oven, close the door and then touch START.
6. Each tim e a button is touched, a BEEP will sound to acknowledge the touch.
7. The display will show :0 when the oven is plugged in.
8. Tim e clock returns to the present tim e when the cooking tim e ends.
9. W hen the S TOP/CLEA R button is touched during the oven operation, the oven stops cooking and all inform ation 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 inform ation is retained.
10. If the START button is touched and the oven does not operate, check the area between the door and door is closed
    securely. The oven will not start cooking under the door is com pletely closed or the program has been reset.




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




                                                                 
 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 safe 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 wear 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 while earthed.
      It is imperative, therefore, to make 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 has stopped an 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 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, take a care w hen 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, H V 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-636T1S
  REF. NO      PA RT CODE               PART N AME                    DESCRIPTION          Q TY   REMARK
    A01         3512203830   FRAM E DOOR                       ABS                          1
    A02         3517005610   BARRIER-SCREEN *0                 PM MA 1.5t                   1
    A03         3515306500   SUPPOTER BARR-S *0                ABS                          1
    A04         3511603800   DECORATOR D OOR                   ABS                          1
    A05         3511706100   DOOR PAINTING AS                  KOR-61150S                   1
    A06         3517002800   BARRIER-SCREEN *1                 KOR-61150S PE 0.1t           1
    A07         3515204110   STOPPER H INGE *T AS              KOR-636T1S SCP T2.6          1
    A08         3515101310   SPRING HOOK                       HSW -3                       1
    A09         3513100730   HOOK                              KOR-6325 POM                 1
    A10         7122401211   SCREW TAPPING                     T2S TRS 4X12 M FZN           1
    A11         3512300200   GASKET DOOR                       KOR-61150S PP                1

  (2) KOR-866T1S
  REF. NO      PA RT CODE                PART N AME                   DESCRIPTION          Q TY   REMARK
    A 01       3512204130    FR A M E D O O R                  A BS                          1
    A 02       3517005710    BA R R IER -S C RE E N *0         P M M A 1.5t                  1
    A 03       3515306600    SU P P O TE R B AR R -S *0        A BS                          1
    A 04        3511604000   DE C O RATO R D O O R             A BS                          1
    A 05        3511711800   DO O R PA IN T IN G A S           K O R -866T 1S                1
    A 06       3517006000    BA R R IER -S C RE E N *I         K O R -866T 1S PE 0.1t        1
    A 07        3515204110   ST O P P E R H IN G E *T A S      K O R -636T 1S SC P T 2.6     1
    A 08       3515101310    SP R IN G H O O K                 HS W -3                       1
    A 09       3513100730    HO O K                            K O R -6325 P O M             1
    A 10        7122401211   SC R E W TA P P ING               T 2S T R S 4X 12 M F Z N      1
    A11        3512302000    GASKET DOOR                       K O R --86671S PP             1


                                                            
 DISASSEMBLY AND ASSEMBLY



  1) Rem ove   the gasket door from door plate.
  2) Rem ove   a screw which secure the door plate and door fram e.
  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) Rem ove   the decorater door from door fram e.
  9) 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-636T1S
  REF. NO        PART CODE                     PART NAM E              DESCRIPTION          QTY
     B01           3516719440       CONTROL-PANEL              ABS                           1
     B02           3515501510       WINDOW DISPLAY             PMMA                          1
     B03           3511603900       DECO RATOR C-PANEL         ABS                           1
     B04           3516907410       BUTTON FUNCTIO N           ABS                           1
     B05           3516907510       BUTTON FUNCTIO N           ABS                           1
     B06           3516907610       BUTTON START               ABS                           1
     B07           3517401700       COUPLER VP C KNO B         PO M                          1
     B08           3513405530       KNOB VPC                   ABS                           1
     B09           3513405220       KNOB VO LUME               ABS                           1
     B10           3514321410       PCB SUB AS                 KO R-636T1S                   1
     B11           7621301011       SCREW TAPPING              T2 PAN 3*10 PW MFZN           6
     B12           3514321310       PCB MAIN AS                KO R-636T1S                   1
     B13           7122401211       SCREW TAPPING              T2S TRS 4*12 MFZN             3

  (2)KOR-866T1S
  REF. NO         PART CODE                    PART NAME               DESCRIPTION          QTY
     B01           3516720240       CO NTROL-PANEL             ABS                            1
     B02           3515501510       WINDOW DISPLAY             PMMA                           1
     B03           3511604100       DE CO RATOR C-PANEL        ABS                            1
     B04           3516907410       BUTTON FUNCTIO N           ABS                            1
     B05           3516907510       BUTTON FUNCTIO N           ABS                            1
     B06           3516907610       BUTTON START               ABS                            1
     B07           3517401700       CO UPLER VPC KNOB          PO M                           1
     B08           3513405530       KNOB VPC                   ABS                            1
     B09           3513405220       KNOB VO LUME               ABS                            1
     B10           3514321410       PCB SUB AS                 KO R-636T1S                    1
     B11           7621301011       SCREW TAPPING              T2 PAN 3*10 PW MFZN            6
     B12           3514321510       PCB MAIN AS                KO R-866T1S                    1
     B13           7122401211       SCREW TAPPING              T2S TRS 4*12 MFZN              3




                                                            
 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 nine screws which secure the PCB assem bly to control panel.
  3) Rem ove the button and knobs from the control panel.
  4) Rem ove the decorator c-panel from the control panel.
  5) Rem ove the window dispiay from the decorator c-panel.
  6) 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.




                              Hook

                                                          Primary
                                                          interlock
                                                          switch
                                                            Interlock
                                                            monitor
                                                            switch
                                                             Door open                           Button
                                                             monitor
                           Lock lever                        switch(rear)
                                                             Secondary
                                                             interlock                         Mounting screw
                                                             switch(front)




                                        Condition : DOOR CLOSE                  Condition : DOOR OPEN


(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
    When the door is closed, the hook pushes the lock lever downward. The hook presses the button of the interlock m onitor
    switch to bring it under NO condition. The lock lever 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 in the w all outlet.
      C heck w ire harness, w iring and connection 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

    Turn table                C heck continuity of                     No                  M alfunction               A djust or
     m otor and             prim ary interlock sw itch             C ontinuity              of prim a ry               replace
   oven lam p do                                                                             interlock
    not turn on                                                                               sw itch


                              C heck continuity 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 . switch


                              C heck D .C. voltage                     0V                    D efective               R eplace
                               being supplied to                                           touch control
                               R ELAY (RY2) coil                                               circuit

                                                                    A pprox.                   Faulty                  R eplace
                                                                    24 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.



    o m icrowave          C heck continuity of high       N o C ontinuity
     oscillation                voltage fuse



                          R eplace high voltage fuse


                          C heck continuity of high        Continuity         Defective      Replace
                             voltage capacitor                              high voltage
                            term inals w ith w ires                         transform er
                                  rem oved


                          C heck continuity of high       Continuity in      Defective       Replace
                             voltage rectifier in          backward         high voltage
                           forw ard and backward           direction          rectifier
                              direction with D C
                                   m egger


                         C onnect m egger leads to          Continuity       Defective       Replace
                         m agnetron term inal and                            magnetron
                             m agnetron body


                           C heck resistance of            0  or              Defective      Replace
                          prim ary and secondary                            high voltage
                            coil of high voltage                            transform er
                                transform er


                            C heck continuity of               No            Defective       Replace
                           m agnetron w ith w ires          Continuity       magnetron
                                 rem oved


                             C heck continuity of              No             Defective      Replace
                         filam ent term inal of high        Continuity      high voltage
                            voltage transform er                            transform er


                            C heck D .C. voltage               0V             Defective      Replace
                             being supplied to                              touch control
                             R ELAY (R Y1) coil                                circuit

                                                             Approx              Faulty      Replace
                                                             24 VDC           contacts or
                                                                                RELAY
                                                                            (RY1) or open
                                                                               relay coil

                                                           
 TROUBLE SHOOTING GUIDE



( TROUBLE 4 ) The following visual conditions indicate a probable defective touch control circuit

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.

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 setted.(For exam ple, when 5:00 setted, 3:00 appears in the display.)

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

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 button 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.




                                                               

 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 



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