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Service Manual
Microwave Oven
Model: KOC-970T1S KOC-970T2S KOC-980T10S KOC-980T20S
DAEWOO ELECTRONICS CO., LTD.
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) D o not operate or allow the oven to be operated w ith the door open. (b) M ake the follow ing 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) P roper door closing, (3) S eal and sealing surfaces (arcing, w ear, and other dam age), (4) D am age to or loosening of hinges and latches, (5) E vidence of dropping or abuse. (c) B efore turning on pow er to the m icrow ave oven for any service test or inspection w ithin the m icrow ave generating com partm ents, check the m agnetron, w ave guide or transm ission line, and cavity for proper alignm ent, integrity, and connections. (d) A ny defective or m isadjusted com ponents in the interlock, m onitor, door seal, and m icrow ave 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 ow ner. (e) A m icrow ave leakage check to verify com pliance w ith the Federal perform ance standard should be perform ed on each oven prior to release to the ow ner.
SAFETY AND PRECAUTIONS ........................................................................................................ 2 SPECIFICATIONS ................................................................................................................ ............ 3 EXTERNAL VIEW ................................................................................................................. ........... 4
1. OUTER DIMENSION .................................................................................................................... 4 2. FEATURE DIAGRAM .................................................................................................................. 5
INSTALLATION .................................................................................................................. .............. 7 CONTROL PANEL ................................................................................................................. .......... 8 DISASSEMBLY AND ASSEMBLY .................................................................................................. 9 INTERLOCK MECHANISM AND ADJUSTMENT ........................................................................... 18 TROUBLE SHOOTING GUIDE ........................................................................................................ 19 MEASUREMENT AND TEST ........................................................................................................... 25
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ..................................................... 25 2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH ................................................ 26 3. MICROWAVE RADIATION TEST ................................................................................................ 27 4. COMPONENT TEST PROCEDURE ............................................................................................ 28
WIRING DIAGRAM ................................................................................................................ .......... 29 SCHEMATIC DIAGRAM .................................................................................................................. 30 EXPLODED VIEWS AND PARTS LIST ........................................................................................... 33 PRINTED WIRING BOARD .......................................................................................................... .... 39 P.C.B. CIRCUIT DIAGRAM .............................................................................................................. 44
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 cavity surface should be kept clean. No grease, soil or spatter should be allowed to build up on these surfaces or inside the oven. DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN. The microwave oven has concealed switches to make sure the power is turned off when the door is opened. Do not attempt to defeat them. DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL.
2. FOR SAFE SERVICE PROCEDURES.
1. If the oven is operative prior to servicing, a microwave emission check should be performed prior to servicing the oven. 2. If any certified oven unit is found to servicing, a microwave emission check should be performed prior to servicing the oven. (1) inform the manufacturer, importer or assembler, (2) repair the unit at no cost to the owner, (3) attempt to ascertain the cause of the excessive leakage, (4) tell the owner of the unit not to use the unit until the oven has been brought into compliance. 3. If the oven operates with the door open, the service person should tell the user not to operate the oven and contact the manufacturer immediately.
IMPORTANT
The w ire in this m ains lead coloured in accordance w ith the following code. G reen-and-yellow Blue Brow n : Earth : N eutral : Live
As the colours of the w ires in the m ains 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 inal in the plug which is m arked w ith the letter 'E' or by earth sym bol or green-and-yellow. The wire which is coloured blue must be connected to the terminal which is marked with the letter 'N' or coloured black. The wire which is coloured brown m ust be connected to the term inal which is m arked with the letter 'L' or coloured red.
NOTE
This oven is designed for counter-top use only.
SPECIFICATIONS
M O DE L PO W E R S UP PLY M IC RO W AV E G RILL PO W E R C O N SU M PTIO N C O N VE CTIO N A UTO CO O K C O M BIN ATIO N M IC RO WAVE EN ER G Y O U TP UT M IC RO WAVE FR EQ UE NC Y O U TS IDE DIM E N SIO N S (W X H X D ) CAVITY D IM EN SIO NS (W X H X D) NE T W EIG HT TIM ER FU N C TIO N S ELE C TIO N S PO W E R SELE CTIO NS CAVITY V O LUM E KO C-970T1S 230V~50H z 1450W 1200W 1550W 1850W 2600W (S im ultaneous) 1000W (IE C705) 2450M Hz KO C-970T2S 230V~50H z 1450W 1200W 1550W 1850W 1550W (S equential) 1000W (IE C705) 2450M Hz
526 x 345 x 412 m m (20.7 x 13.6 x 16.2 in.) 335 x 250 x 339 m m (13.2 x 9.8 x 13.3 in.) AP PR O X . 19.5 K g (43 lbs.) 60 m inutes M IC R O W AV E /G RILL/C O N VE C TIO N /CO M B I 10 LEVELS 1.0 Cu.Ft.
M O DE L PO W E R S UP PLY M IC RO WAVE G R ILL PO W E R C O N SU M PTIO N CO NV EC TIO N AU TO CO O K CO M B INATIO N M IC RO WAVE EN ER G Y O U TP UT M IC RO WAVE FR EQ UE NC Y O U TS IDE DIM E N SIO N S (W X H X D ) CAVITY D IM EN SIO NS (W X H X D) NE T W EIG HT TIM ER FU NC TIO N SELE CTIO NS PO W E R SELE CTIO NS CAVITY V O LUM E
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
KO C980T10S 230V~50H z 1450W 1200W 1550W 1850W 2600W (S im ultaneous) 1000W (IE C705) 2450M Hz
KO C980T20S 230V~50H z 1450W 1200W 1550W 1850W 1550W (S equential) 1000W (IE C705) 2450M Hz
526 x 345 x 482 m m (20.7 x 13.6 x 19.0 in.) 335 x 250 x 339 m m (13.2 x 9.8 x 13.3 in.) AP PR O X . 21 Kg (46.3 lbs.) 60 m inutes M ICR O W AV E/G RILL/C O N VECTIO N /CO M BI 10 LE VE LS 1.0 Cu.Ft.
EXTERNAL VIEW
1. OUTER DIMENSION
KOC-970T
Fig.1 Front view
Fig.2 Side view
KOC980T
Fig.1 Front view
Fig.2 Side view
EXTERNAL VIEW
2. FEATURE DIAGRAM
KOC-970T
1. Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 2. Door hook - When the door is closed, it will automatically shut. If the door is opened while the oven is operating, the magnetron will immediately stop operating. 3. Door viewing screen - Allows viewing of food. The screen is designed so that light can pass through, but not the microwave. 4. Top heater - Turns on when convection, grill and combi cooking is selected. 5. Oven lamp - Automatically turns on during oven operating. 6. Safety interlock system 7. Control panel 8. Turntable tray - Rotates during cooking and ensure even distribution of Microwaves. It can also be used as a cooking utensil. 9. Oven front plate 10. Rotating base - This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all cooking. It should only be removed for cleaning. 11. Under heater
EXTERNAL VIEW
KOC980T
1. Door seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. 2. Door hook - When the door is closed, it will automatically shut. If the door is opened while the oven is operating, the magnetron will immediately stop operating. 3. Door viewing screen - Allows viewing of food. The screen is designed so that light can pass through, but not the microwave. 4. Top heater - Turns on when convection, grill and combi cooking is selected. 5. Oven lamp - Automatically turns on during oven operating. 6. Safety interlock system 7. Control panel 8. Turntable tray - Rotates during cooking and ensure even distribution of Microwaves. It can also be used as a cooking utensil. 9. Oven front plate 10. Rotating base - This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all cooking. It should only be removed for cleaning. 11. Under heater 12. Metal rack
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 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 13amperes, 230 Volts, 50 Hz. Power supply cord is about 1.2 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 ampere fuse other than those specified. · This appliance is supplied with cable of special type, which, if damaged, 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 the oven to become room temperature before operating.
EARTHING INSTRUCTIONS
This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of the electric shock by providing an escape wire for the electric current. This appliance 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.
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-w ire 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 Do not use an extension cord.
CONTROL PANEL
W hen blinking, the oven is operating in "CO M BI" cooking m ode. W hen blinking, the oven is operating in "G RILL" cooking m ode. W hen blinking, the oven is operating in "M IC RO W AVE" cooking m ode. W hen blinking, the oven is operating in "AUTO CO OK" cooking m ode. W hen blinking, the oven is operating in "PIE" cooking m ode. W hen blinking, the oven is operating in "CO NVECTIO N" cooking m ode.
W hen blinking, the oven is operating in "W EIG H T D EFRO ST" cooking m ode. W hen blinking, the oven is operating in "TIM E D EFRO ST" cooking m ode. W hen blinking, the oven is operating in weght input m ode. C ooking tim e is increased by 1 m inute.
+1m in
DEFROST M/W GRILL COMBI WEIGHT - TIME
AUTO COOK
PIE
TEMP COOK
KG
Grill
Com bi
C ooking tim e is increased by 10 seconds.
Pie Tem p +10sec
Function ButtonAuto Cook
1.Roast Beef 2.Roast Pork 3.Roast Chicken 4.Fish Fillets 5.Vegetable
Tem perature ButtonUsed to set desired tem perature. If this button is pressed for m ore than 1.3 sec, num ber is scrolled up autom atically.
STO P/ CLEAR
START
M /W
+
Speedy
Used to select desired cooking function. M /W : M ICRO W AVE G rill Defrost : TIM E or W EIG HT DEFRO ST Tem p : CO NVEC TION Com bi : C OM BINATIO N Pie Auto Cook
Start ButtonDefrost
M icrowave Power LevelU sed to select the variable m icrowave power level. If this button is pressed for m ore than 1.3 sec, num ber is scrolled up autom atically.
Clock
-
Used to start the selected cooking cycle.
Speedy Cook ButtonUsed to program quickly cooking tim e in 30 sec increm ents.
TIM E/W EIGHT
Guide Lam pW hen blinking, it inform s you to be ready to operate dial knob.
C lock ButtonUsed to set tim e
Dial KnobUsed to set the cooking tim e, tim e of day and weight input.
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 15A 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
Service 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 icrowave. These parts are as follow s - H V Transform er, M agnetron, HV C apacitor, H V D iode.
DISASSEMBLY AND ASSEMBLY
1. To remove cabinet
(1) Remove four screws on cabinet back. (2) Push the cabinet backward.
2. To remove guide wind assembly
(1) Remove two screws for earthing and for fixing to rear-plate. (2) Remove the noise filter from the guide wind. (3) Pull the fan from the motor shaft. (4) Remove two screws which secure the motor shaded pole. (5) Remove the motor shaded pole. (6) Reverse the above steps for reassembly.
DISASSEMBLY AND ASSEMBLY
3. To remove H.V.transformer
(1) Remove four screws which secure the H.V.transformer to the base plate. (2) Remove the H.V.transformer. (3) Reverse the above steps for reassembly.
4. 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
DISASSEMBLY AND ASSEMBLY
5. To remove magnetron
(1) Remove three screws which secure the magnetron. (2) Remove the magnetron. (3) Reverse the above steps for reassembly.
CAUTION
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 w ith door norm ally closed.
DISASSEMBLY AND ASSEMBLY
6. To remove control panel assembly
(1) Remove a screw which secure the control panel assembly to the oven front plate. At the same time, draw forward the control panel assembly from the oven front plate. (2) Remove the dial knob. (3) Remove nine screws which secure the main and sub PCB assembly to control panel. (4) Remove buttons. (5) Remove the window display and decorator panel.
REF NO.
B 01 B 02 B 03 B 04 B 05 B 06 B 07 B 08
PART CODE
3511602400 3515501200 3516715110 3516906000 3516905900 3516905800 3516906100 PK BP M S Q 200 PK M P M S Q 200 PK M P M S Q 230 PK M P M S YA 00 PK M P M S YA 00
PART NAME
D EC O R ATO R C -PA NE L W IN DO W D IS P LAY C O N TR O L-PA N E L B UTTO N FUN CTIO N B UTTO N FUN CTIO N B UTTO N S TA RT B UTTO N FUN CTIO N P C B SU B A S P C B M A IN A S P C B M A IN A S P C B M A IN A S P C B M A IN A S
SCREW TAPPING KNOB VOLUME
DESCRIPTION
A BS P M M A IF-850 A BS A BS A BS A BS A BS K O C -970T/980T K O C -970T1S K O C -970T2S K O C 980T10S K O C 980T20S
T2S PAN 3x8 MFZN ABS
QTY
1 1 1 1 1 1 1 1 1 1 1 1
REMARK
SM O G
KO R-816 KO R-816
B 09
B10 B11
7121300811 3513403810
9 1 KOR-816
DISASSEMBLY AND ASSEMBLY
7. To remove door assembly
(1) Remove two screws which secure the stopper hinge top. (2) Remove the door assembly from top plate of cavity. (3) Reverse the above steps for reassembly.
NOTE
After replacing the door assem bly, perform a check of correct alignm ent w ith the hinge and cavity front plate.
8. To remove door parts
(1) Remove the gasket door. (2) Remove two screws. (3) Remove the door seal assy. (4) Remove the hook and spring. (5) Remove the supporter and barrier-screen *o. (6) Remove the handle from the frame door.
REF NO.
A 01 A 02 A 03 A 04 A 05 A 06 A 07 A 08 A 09 A 10
PART CODE
3512203320 3512601400 3517004020 3515304700 3511708400 3513101100 3515101300 3515203600 7121400811 3512300800
PART NAME
FR AM E DO O R HA ND LE DO O R BA RR IER -S CR EE N *O SU PP O RTE R B AR R-S *O DO O R S EA L AS HO O K SP RIN G HO O K STO P PE R H IN G E *T AS SC RE W TA PP ING G A SK ET DO O R ABS ABS
DESCRIPTION
QTY
1 1 1 1 1 1 1 1 2 1
REMARK
TE M P ER ED G LAS S T3.2 N Y LO N 66 K O C-971C POM PW1 K O C-970T1S T2S PA N 4x8 M FZN PBT
DISASSEMBLY AND ASSEMBLY
9. 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 two screws. (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. (3) To reduce gap located on part `C' · Loosen a screw on interlock switch assembly located bottom of oven body. · Draw the interlock switch assembly inward as possible to engage with hook on the door bottom. · Tighten a screw. (4) To reduce gap located on part `D' · Loosen a screw on interlock switch assembly located top of oven body. · Following steps are same as step (3).
NOTE
Sm all gap m ay be acceptable if the m icrow ave leakage does not exceed 1m W /cm 2
NOTE
The door on a m icrow ave oven is designed to act as an electronic seal preventing the leakage of m icrow ave energy from the oven cavity during the cook cycle. This function does not require that the door be air-tight, m oisture (condensation) Tight or light-tight. Therefore, the occasional appearance of m oisture, light or the sensing of gentle w arm air m ovem ent around the oven door is not abnorm al and do not of them selves, indicate a leakage of m icrowave energy from the oven cavity. If such were the case, your oven could not be equipped w ith a bent, the very purpose of w hich is to exhaust the vapor-laden air from the oven cavity.
DISASSEMBLY AND ASSEMBLY
10. To remove motor syncro and under heater
(1) Cut the syncro motor cover parts from the base plate. (2) Remove two screws which secure the motor syncro and supporter to bracket syncro motor. (3) Remove two screws and under heater assembly in cavity
11. To remove grill heater assembly
(1)Remove two screws which secure the cover insulator *t to top plate. (2) Remove the harness between heaters. (3) Remove two screws for removing heater brackets. (4) Remove heaters. (5) Reverse the above steps for reassembly.
DISASSEMBLY AND ASSEMBLY
12. To remove convection part assembly (KOC980T only)
(1) Remove cover *b and cover insulator *b protecting convection part assembly. - release two lances of cover insulator *b. (2) Remove four screws which secure the convection part assembly to the cavity rear plate. (3) Remove a nut holding the convection fan and the pipe. (4) Remove two screws which secure the bracket motor to cover insulator. (5) Remove the cooling fan. (6) Remove two screws which secure the motor shaded pole to the bracket motor. (7) Reverse the above steps for reassembly.
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, door open monitor switch and interlock monitor switch When the door is closed, the hook pushes the latch lever downward. The latch lever presses the button of the interlock monitor switch to bring it under "OFF" condition and presses the button of the secondary interlock switch and door open monitor switch to bring it under "ON" condition.
ADJUSTMENT
Interlock monitor switch When the door is closed, the interlock monitor switch should be opened before other switches are closed. When the door is opened, the interlock monitor switch should be closed after other switches are opened. 3. Adjustment steps (1) Loosen two mounting screws. (2) Adjust interlock switch assembly position. (3) Make sure that latch lever moves smoothly after adjustment is completed. (4) Tighten completely two mounting screws.
NOTE
Microwave emission test should be performed after adjusting interlock mechanism. If the microwave emission exceed 4mW/cm2, readjust interlock mechanism.
TROUBLE SHOOTING GUIDE
Following the procedures 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 then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.
NOTE
W hen electric parts are checked, be sure the pow er cord is not inserted the w all outlet. Check wire harness, wiring, and connected of the term inals and pow er cord before check parts listed below.
(TROUBLE 1) Oven does not operate at all; any inputs can not be accepted.
CON DITION
Fuse blow s.
CHECK
C heck co ntinuity of interlock m onitor sw itch w ith door closed (C O M N C)
RESULT
(C O M N C) C ontinuity (C O M N C) N o C ontinuity
CAUSE
M alfunction of interlock m on itor sw itch
REM EDY
R eplace N O TE 1
C heck co ntinuity of both prim ary and secondary interlock sw itch w ith door closed
No C ontinuity C ontinuity
M alfunction of interlock sw itch
R eplace N O TE 1
C heck co ntinuity of prim ary interlock sw itch contact with door partially open until interlock m onitor sw itch contact close (C O M N C close)
C ontinuity
S horted contacts of prim ary interlock sw itch
R eplace N O TE 1
C heck co ntinuity of prim ary w inding of low voltage transform er
0 or infinite A pprox. 150~210 (norm al)
D efective low voltage transform er
R eplace
D isconne ct high voltage fuse and operate the unit
Fuse again blows
D efective high voltage transform er
R eplace
TROUBLE SHOOTING GUIDE
CON DITION
O utlet has proper voltage Fuse does not blow.
CHECK
C heck con tinuity of m agn etron C heck con tinuity of noise filter board C heck con tinuity of pow er supply cord
RESULT
No C ontinuity No C ontinuity No C ontinuity N orm al
CAUSE
D efective m agn etron D efective noise filter board O pen pow er supply cord D efective touch control circuit
REM EDY
R eplace
R eplace
A djust
A djust
NOTE
All these sw itches m ust be replaced at the sam e tim e, please refer to (7.Interlock M echanism and Adjust) for adjustm ent instructions.
(TROUBLE 2) Grill heater (top heater) is not heated; Food will not become hot.
CON DITION
G rill heater is not heated.
CHECK
C heck continuity of prim ary interlock sw itch
RESULT
No C ontinuity
CAUSE
M alfunction of prim ary interlock sw itch M alfunction of secondary interlock sw itch D efective heater D efective touch control circuit Faulty contacts of R ELAY (RY 2) or open relay coil
REM EDY
A djust or R eplace
C heck continuity of secondary interlock sw itch
No C ontinuity
A djust or R eplace
C heck continuity of heater C heck D .C. voltage being supplied to R ELAY (R Y2) coil
No C ontinuity 0V
R eplace
R eplace
A pprox 12 VD C
R eplace
TROUBLE SHOOTING GUIDE
(TROUBLE 3) No microwave oscillation even though fan motor rotates.
CON DITION
N o m icrowave oscillation
CHECK
C heck con tinuity of high voltage fuse R eplace high voltage fuse
RESULT No Continuity
CAUSE
REM EDY
C heck con tinuity of high voltage capacitor term inals w ith w ires rem oved
Continuity
Defective high voltage transform er
Replace
C heck con tinuity of high voltage rectifier in forw ard and backw ard direction with D C m egg er
Continuity in backw ard direction
Defective high voltage rectifier
Replace
C onnect m egger leads to m agn etron term inal and m agn etron body
Continuity
Defective m agnetron
Replace
C heck resistance of prim ary and secondary coil of high voltage transform er C heck con tinuity of m agn etron w ith w ires rem oved
0 or
Defective high voltage transform er
Replace
No Continuity
Defective m agnetron
Replace
C heck con tinuity of filam ent term inal of high voltage transform er
No Continuity
Defective high voltage transform er Defective touch control circuit Faulty contacts of RELAY (RY3) or open relay coil
Replace
C heck D .C. voltage being supplied to R ELAY (R Y3) coil
0V
Replace
Approx 13 VDC
Replace
TROUBLE SHOOTING GUIDE
(TROUBLE 4) Display shows all figures selected, but oven does not start cooking, even though desired program and time are set and start pad is tapped.
C O N D ITIO N
Turn table m oto r and oven lam p do not turn on
C H EC K
C heck con tinuity of prim ary interlock sw itch
R ESU LT
No C ontinuity
C AU SE
M alfunction of prim ary interlock sw itch M alfunction of secondary interlock and D .O .M . sw itch D efective touch control circuit F aulty contacts of R ELAY (R Y 4) or open relay coil
R EM ED Y
A djus t or replace
C heck con tinuity of secondary interlock and D .O .M . sw itch
No C ontinuity
A djus t or replace
C heck D .C . voltage being supplied to R ELAY (R Y4) coil
0V
R eplace
A pprox. 13 VD C
R eplace
(TROUBLE 5) 1) Under heater is not heated; Food will not become hot. 2) Convection motor does not rotate.
C O N D ITIO N
1) U nde r hea ter is n ot heated. 2) C onv ection fan and m otor does n ot rotate.
C H EC K
C heck con tinuity of prim ary interlock sw itch
R ESU LT
No C ontinuity
C AU SE
M alfunction of prim ary interlock sw itch M alfunction of secondary interlock sw itch
R EM ED Y
A djus t or replace
C heck con tinuity of secondary interlock sw itch
No C ontinuity
A djus t or replace
C heck con tinuity of heater (m otor)
No C ontinuity
D efective heater(m otor)
R eplace
C heck D .C . voltage being supplied to R ELAY (R Y6) coil
0V
D efective touch control circuit F aulty contacts of R ELAY (R Y 6) or open relay coil
R eplace
A pprox. 13 VD C
R eplace
TROUBLE SHOOTING GUIDE
(TROUBLE 6) The following visual conditions indicate a probable defective touch control circuit or button P.C.B. assembly. 1. Incomplete segments (1) Segments missing (2) Partial segments missing (3) Digit flickering other than normal fluorescent slight flickering (4) 0 does not display when power is on. 2. A distinct change in the brightness of one or more numbers exists in the display. 3. One or more digits in the display are not on when they should be. 4. Display indicates a number different from one touched. (for example, even if one touched 5, 3 appears in the display. 5. Specific numbers (for example, 2 or 3) do not display when the button is touched. 6. Display does not count down or up with time cooking or clock operation. 7. Oven is programable and cooks normally but no display shows. 8. Display obviously jumps in time while counting down. 9. Display counts down noticeably too fast while cooking. 10. Display does not show the time of day when clear button is touched. 11. Oven lamp and turntable motor do not stop although cooking is finished. Check if the RELAY (RY3) contacts close and if they are close, replace touch control circuit.
CON DITION
D isplay does not show program m ing at all, even if keyboard is touched.
CHECK
C heck each button for continuity of the button keyboard for the following keyboard check procedure
RESULT
N orm al
CAUSE
M alfunction of touch control circuit of control box sub-a ssem bly
REM EDY
R eplace control box sub-a ssem bly
N orm al
M alfunction of botton keyboard
R eplace the button keyboard
NOTE
Before follow ing the particular steps listed above in the trouble shooting guide for the button keyboard's failure, please check for the continuity of each w ire-harness betw een the button keyboard and P.C .B. assem bly.
TROUBLE SHOOTING GUIDE
BUTTON KEYBOARD CHECK PROCEDURE
1. Type of button names
( key metrix and circuit diagram ) The tact switch keyboard consists of 10 keys which configurations are described above. 2. Key check procedure To determine if the tact switch keyboard is defective or not, check the continuity of each button(key) contacts with a multimeter. (1) AUTO COOK button : between 4 and 10 (2) DEFROST button : between 4 and 14 (3) TEMP button : between 8 and 12 (4) MICROWAVE button : between 6 and 14 (5) COMBI button : between 6 and 12 (6) GRILL button : between 2 and 10 (7) +10 SEC button : between 8 and 10 (8) +1 MIN button : between 6 and 10 (9) STOP/CLEAR button : between 2 and 12 (10) START button : between 4 and 12 (11) CLOCK button : between 8 and 14 (12) PIE button : between 2 and 14
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 wit 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 190 mm. 3. The oven and the empty vessel are at ambient temperature prior to the start of the test. The initial temperature of the water is 10 ± 2 °C (50 ± 3.6 °F). It is measured immediately before the water is added to the vessel. After addition of the water to the vessel, the load is immediately placed on the center of the shelf, which is in the lowest normal position. 4. Microwave power is switched on. 5. Heating time should be exactly A seconds. Heating time is measured while the microwave generator is operating at full power. The filament heat-up time for magnetron is not included. 6. The initial and final temperature of water is selected so that the maximum difference between the ambient and final water temperature is 5K. 7. The microwave power output P in watts is calculated from the following formula: P = 4187 T/t · DT is difference between initial and ending temperature. · t is the heating time. The power measured should be B (refer to 2. Specifications)W ± 10.0 %.
CAUTION
1. Water load should be measured exactly to 1 liters. 2. Input power voltage should be exactly specified voltage(Refer to 2. SPECIFICATIONS). 3. Ambient temperature should be 20 ± 2 °C (68 ± 3.6°F)
Heating time for power output:
A(second) B(W ) 70 600 64 650 60 700 56 750 52 800 49 850 47 900 44 950 42 1000 40 1050 38 1100
MEASUREMENT AND TEST
2. ELECTRICAL CONTINUITY CHECK OF INTERLOCK SWITCH
NOTE
R em ove the power plug from the w all receptacle before testing.
PROCEDURE
1. Primary interlock switch (1) Disconnect two connectors from primary interlock switch. (2) Connect the ohm-meter leads between the terminals of the primary interlock switch. 2. Read the value of resistance between the terminals of the switch, when the door is opened, and when the door is closed. 3. Secondary interlock switch (1) Disconnect two connectors from secondary interlock switch. (2) Connect the ohm-meter leads between the terminals of the secondary interlock switch. (3) Read the value of resistance between the terminals of the switch, when the door is opened, and when the door is closed. 3. Monitor interlock switch (1) Disconnect the lead wire connecting the primary interlock switch and interlock monitor switch from primary interlock switch terminal. (2) Connect the ohm-meter leads between the lead wire connector disconnected as item1 and the power supply neutral plug pin. (3) Read the value of resistance between the lead wire connector and the power supply neutral plug pin, when the oven door is opened, and when the oven door is closed.
JUDGEMENT
· The value of resistance should be applied to the value specified below.
Switch
Prim ary interlock sw itch Secondary interlock sw itch Interlock m onitor circuit
Door Open
0
Door Close
0 0
· When value obtained is not acceptable, the switch should be replaced or adjusted again.
MEASUREMENT AND TEST
3. MICROWAVE RADIATION TEST
WARNING
M ake sure to check the m icrowave leakage before and after repair of adjustm ent. Always start m easuring of an unknown field to assure safety for operating personnel from m icrow ave energy. D o not place your hands into any suspected m icrowave radiation field unless the safe density level is know n. C are should be taken not to place the eyes in direct line w ith the source of m icrow ave energy. Slow ly approach the unit under test until the radiom eter reads an appreciable m icrow ave leakage from the unit under the test.
PROCEDURE
1. Prepare Microwave Energy Survey Meter, 600cc glass beaker, and glass thermometer 100°C (212°F ). 2. Pour 275cc ±15cc of tap water initially at 20 ± 5 °C (68 ± 9°F) in the 600 cc glass beaker with an inside diameter of approx. 95 mm(3.5 in.). 3. Place it at the center of the tray and set it in a cavity. 4. Close the door and operate the oven. 5. Measure the leakage by using Microwave Energy Survey Meter with dual ranges, set to 2450MHz. · 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/cm2. · When measuring the leakage, always use the 5 cm (2 in.) space cone with probe. Hold the probe perpendicular to the cabinet and door. Place the space cone of the probe on the door, cabinet, door seem, door viewing screen, the exhaust air vents and the suction air vents. · Measuring should be in a counter-clockwise direction at a rate of 1 in./sec. If the leakage of the cabinet door seem is unknown, move the probe more slowly. · When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 in. from any metal. If it does not, erroneous reading may result.
MEASUREMENT AND TEST
4. 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. 100 10% Filament winding ... Approx. 0.1 Primary winding ... Approx. 1.5 2. High voltage capacitor (1) Check continuity of capacitor with meter on the highest OHM scale. (2) A normal capacitor will show continuity for a short time, and then indicate 9M once the capacitor is charged. (3) A shorted capacitor will show continuous continuity. (4) An open capacitor will show constant 9M (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 may be read in both directions. A normal diode's resistance will be infinite in one direction and several hundred kin the other direction. 4. Magnetron For complete magnetron diagnosis, refer to "Measurement of the Microwave Output Power." 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.
WIRING DIAGRAM
SCHEMATIC DIAGRAM
SCHEMATIC DIAGRAM
SCHEMATIC DIAGRAM
EXPLODED VIEWS AND PARTS LIST
1. KOC-970T
EXPLODED VIEW
EXPLODED VIEWS AND PARTS LIST
PARTS LIST
REF NO.
A 00 B 00 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15 F16 F17 F18 F19 F20 F21 F22 F23 F24 F25 F26 F27 F28 F29 F30 F31 F32 F33 F34
PART CODE
3511708310 P KC PS W Q 200 P KC PS W Q 230 3516107910 3516503300 3514800800 7113400814 3511403800 7113400814 3514400600 3517401300 3966510200 7121400811 3510604000 7113400814 3512802100 7113400814 3510310400 3515202810 7S422X 4081 3512100900 4416W 67820 441X304112 7S422X 4081 4416V24000 3518112100 7S427W 40A 1 7S312X 40A 1 3513809100 3513601600 5S762S 10G 0 5S762310G 0 3513701300 7S341W 40B 1 7S341W 40B 1 7S422X 4081 3517502700
PART NAME
DO O R A S CO NTRO L-PA N EL AS CO NTRO L-PA N EL AS CAVITY W E LD AS RE AR -PLATE *O SE NS O R TE M P ER ATUR E SC RE W TA PP ING CO VE R W AV E G UIDE SC RE W TA PP ING PIP E CO UP LE R M O TO R SY NC RO SC RE W TA PP ING BR AC KE T M O TO R S Y NC RO SC RE W TA PP ING HE ATER *U AS SC RE W TA PP ING BA SE STO P PE R H IN G E *U A S SC RE W S PE C IA L FO O T CA PA CITO R H V HO LD ER HV CAPA CITO R SC RE W S PE C IA L DIO D E H V TR AN S H V SC RE W S PE C IA L SC RE W S PE C IA L LO CK LA M P SW M ICR O SW M ICR O LE VE R LO CK SC RE W S PE CIA L SC RE W S PE CIA L SC RE W S PE C IA L PR O TEC TO R H EATE R
DESCRIPTION
KO C-970T KO C-970T1S KO C-970T2S KO C-970T SB HG -1 TO .6 PTM -K312-D4 T1 BIN 4*8 M FN I M ICA TO .5 T1 BIN 4*8 M FN I BR AS S C 3604B D CE RA M IC 230V 25W G M -16-24FD 24 T2S PAN 4*8 M FZN SE CC TO .8 T1 BIN 4*8 M FN I KO C-971CO S T1 BIN 4*8 M FN I SB HG -1 T0.8 KO C-970T TT2 TRS 4*8 SE M FZN PP, D AS F-130
2100VA C , 1.1 U F
QTY
1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 2 1 1 2 4 1 1 1 1 1 4 6 1 1 2 2 1 2 1 1 2
REMARK
SECC TO .8 TT2 TRS 4*8 SE M FZN SA NK EN HV R-1X-32B (D5.3) DY -90S0-97T1 TT2 H EX FG 4*10 S E M FZN T1 TR S 4*10 SE M FZN PO M BL 240V25W T25 C 7A H187 SZM -V16-FA -63 SZM -V16-FA -61 PO M T2S PAN 4*12 P W SE M FZN T2S PAN 4*12 P W SE M FZN TT2 TRS 4*8 SE M FZN M ICA M T56 T1.0
EXPLODED VIEWS AND PARTS LIST
REF NO.
F35 F36 F37 F38 F39 F40 F41 F42 F43 F44 F45 F46 F47
PART CODE
3510603610 7S312X 40A 1 3512803000 3512765100 3517302500 3518002400 7S427W 40A 1 3511800100 3512505200 3963513000 7121403011 7S341W 40B 1 3518604600 3518605500 4417B67600 5F1CD 1232M 7S312X 40A 1 35113A 5Q 5J 35113A 5Q M 5 7S312X 40A 1 7S427W 40A 1 3512505500 7S312X 40A 1 3511404800 7S312X 40A 1 3510801900 7S312X 40A 1 3512513000 3517205200 3518700220
PART NAME
BR AC KE T H EATE R *T SC RE W S PE C IA L HE ATER M IRA CLO N HA RN ES S H EATE R FO AM M A G N ETRO N SC RE W S PE C IA L FA N G U ID E W IND M O TO R SH AD ED PO LE SC RE W TA PP ING SC RE W S PE CIA L NO IS E -FILTER NO IS E -FILTER FU SE FU SE SC RE W S PE C IA L CO RD P O W ER AS CO RD P O W ER AS SC RE W S PE C IA L SC RE W S PE C IA L G U ID E A IR O UTLE T SC RE W S PE C IA L CO VE R INS U LATO R *T SC RE W S PE C IA L CA BIN ET SC RE W S PE C IA L G U ID E TRAY A S TR AY M ETAL FU SE HV
DESCRIPTION
SE CC T0.6 TT2 H EX FG 4*10 M FZN 115V 550W #187 FLA G 65M M CR 10T*180*30 2M 218J(M F)I TT2 H EX FG 4*10 S E M FZN PP G F20 PP 230V25W O E M -15D W C2-A03 T2S PAN 4*30 M FZN T2S PAN 4*12 P W SE M FZN DW LF-P (KO C-970T1S ) DW LF-M O 7(KO C-970T2S ) 15A 250V (K O C-970T1S ) 12A 250V (K O C-970T2S ) T1 TR S 4*10 SE M FZN 3*1.5(KO C-970T1S ) 3*1.0(KO C-970T2S ) T1 TR S 4*10 SE M FZN TT2 H EX FG 4*10 S E M FZN SA 1D -80 TO .5 T1 TR S 4*10 SE M FZN SE CC TO .5 T1 TR S 4*10 SE M FZN PC M TO .5 T1 TR S 4*10 SE M FZN KO C-971CO S SP P TO .6 5K V 0.7A TH VO 60T
QTY
2 2 2 1 1 1 3 1 1 1 2 1 1 1 1 1 1 1 1 2 2 1 1 1 1 1 4 1 1 1
REMARK
F48 F49 F50 F51 F52 F53 F54 F55 F56 F57 F58 F59 F60 F61
EXPLODED VIEWS AND PARTS LIST
2. KOC-980T
EXPLODED VIEW
EXPLODED VIEWS AND PARTS LIST
PARTS LIST
REF NO.
A 00 B 00 F01 F02 F03 F04 F05 F06 F07 F08 F09 F10 F11 F12 F13 F14 F15 F16 F17 F18 F19 F20 F21 F22 F23 F24 F25 F26 F27 F28 F29 F30 F31 F32 F33 F34 F35 F36 F37 F38
PART CODE
3511708310 PKC P SW YA00 P KC P SW YA00 3516107950 3518904400 7121400611 7112400811 3511403800 7113400814 3514400600 3517401300 3966510200 7121400811 3510604000 7113400814 3512802100 7113400814 3510310400 3515202800 7S 422X4081 3512101400 4416W 67820 441X304112 7S 422X4081 4416V 24000 3518112100 7S 427W 40A 1 7S 312X40A 1 3513809100 3513601600 5S 762S10G 0 5S 762310G 0 3513701300 7122401211 7122401211 7S 422X4081 3517502700 3510603610 7S 312X40A 1 3512803000 3512765100
PART NAME
DO O R AS CO NTRO L-PAN EL AS CO NTRO L-PAN EL AS CAVITY W E LD A S TH E RM O S TAT SC RE W TAP PIN G SC RE W TAP PIN G CO VE R W AV E G UID E SC RE W TAP PIN G PIP E CO UP LER M O TO R S YN CR O SC RE W TAP PIN G BR A CK ET M O TO R SY NC RO SC RE W TAP PIN G HE ATER *U AS SC RE W TAP PIN G BA S E STO P PE R H ING E *U A S SC RE W S PE CIA L FO O T CA PA CITO R H V HO LDER HV CAPA CITO R SC RE W S PE CIA L DIO DE HV TR A NS H V SC RE W S PE CIA L SC R E W S PE C IA L LO C K LAM P SW M ICR O SW M ICR O LEV ER LO CK SC RE W TAP PIN G SC RE W TAP PIN G SC RE W S PE CIA L PR O TE CTO R H EATE R BR A CK ET HE ATER *T SC R E W S PE C IA L HE ATER M IR AC LO N HA RN E SS HE ATER
DESCRIPTION
K O C 980T KO C 980T10S (SIM UL.) K O C 980T20S (SE Q U EN TIA L) K O C 980TI0S 120/60, #187 T2S PA N 4*6 M FZN T1 TRS 4X 8 M FZN M IC A TO .5 T1 B IN 4*8 M FNI B RA SS C3604BD CE R AM IC 230V 25W G M -16-24FD 24) T2S PA N 4*8 M FZN S EC C TO .8 T1 B IN 4*8 M FNI K O C -971C O S T1 B IN 4*8 M FNI S BH G TO .8 K O R -121M O A TT2 TR S 4*8 S E M FZN P P, DA SF-130
2100VA C , 1.1 U F
Q'TY
1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 2 1 1 2 4 1 1 1 1 1 4 5 1 1 2 2 1 2 1 1 2 2 2 2 1
REMARK
S EC C TO .8 TT2 TR S 4*8 S E M FZN S AN KE N H VR -1X -32B(D 5.3) DY -N90S0-97T1 TT2 HE X FG 4*10 SE M FZN T1 TRS 4*10 S E M FZN POM B L 240V 25W T25 C7A H 187 S ZM -V 16-FA-63 S ZM -V 16-FA-61 POM T2S TR S 4*12 M FZN T2S TR S 4*12 M FZN TT2 TR S 4*8 S E M FZN M IC A M T56 T1.O S EC C TO .6 T1 TRS 4*10 S E M FZN 115V 550W #187 FLAG 65M M
EXPLODED VIEWS AND PARTS LIST
REF N O.
F 39 F 40 F 41 F 42 F 43 F 44 F 45 F 46 F 47 F 48 F 49 F 50 F 51 F 52 F 53 F 54 F 55 F 56 F 57 F 58 F 59 F 60 F 61 F 62 F 63 F 64 F 65 F 66 F 67 F 68 F 69 F 70 F 71 F 72 F 73 F 74 F 75
PAR T CODE
3517302500 3518002400 7S 427W 40A 1 3511800100 3512505200 3963513000 7112403011 7122401211 3518604600 3518605500 4417B 67600 5F 1C D 1232M 7112401011 35113A5Q 5J 35113A5Q M 5 7112401011 7S 427W 40A 1 3512505500 7112401011 3511404800 7112401011 3510801000 7112401011 3512513000 3517205200 3514800800 7113400814 3518700220 3511401300 3510601500 3963513200 7051400811 441B629071 3514400400 3511401800 3511800400 7121400811 7S 627W 50X 1 7S 627W 50X 1 3511402100 FOAM
PART NA ME
M A G NE T R O N S C R EW S P EC IA L FA N G U IDE W IN D M O TO R S H A DE D P O LE S C R EW TA P P IN G S C R EW TA P P IN G N O IS E-F ILT E R N O IS E-F ILT E R FUSE FUSE S C R EW TA P P IN G CORD POWER AS CORD POWER AS S C R EW TA P P IN G S C R EW S P EC IA L G U IDE A IR O U T LET S C R EW TA P P IN G C O V ER IN S ULATO R *T S C R EW TA P P IN G C A B INE T S C R EW TA P P IN G G U IDE T R AY AS T R AY M E TA L S E N SO R T EM P E RATU R E S C R EW TA P P IN G FUSE HV C O V ER IN S ULATO R *B B R A CK E T M O TO R M O TO R S H A DE D P O LE S C R EW M AC H IN E FA N P IP E C O V ER IN S ULATO R FA N CO N V EC T IO N S C R EW S P EC IA L S C R EW TA P P IN G S C R EW TA P P IN G C O V ER *B
DESCRIPTION
C R 10T *180*30 2M 218J(M F )I T T2 H E X F G 4*10 S E M F Z N P P G F 20 PP 230V 25W O EM -15D W C2-AO 3 T 2S PA N 4*30 M F ZN T 2S T R S 4*12 M F Z N D W LF -P (K O C 980T 10S ) D W LF -M O 7(K O C 980T20S ) 15A 250V(K O C 980T 10S) 12A 250V(K O C 980T 20S) T 1 T R S 4*10 M FZ N 3*1.5(K O C980T 10S ) 3*1.0(K O C980T 20S ) T 1 T R S 4*10 M FZ N T T2 H E X F G 4*10 S E M F Z N S A1D -80 T O .5 T 1 T R S 4*10 M FZ N S EC C TO .5 T 1 T R S 4*10 M FZ N P CM TO .5 T 1 T R S 4*10 M FZ N K O C -971C O S S PP TO .6 PT M -K 312-D4 T 1 B IN 4*8 M F NI 5KV 0.7A S BH G -1 0.6T S BH G -1 0.8T O EM -10DW C 2-A 09 PA N 4*8 S W M F Z N S BH G -1 0.6T A L1100 S A1D -80 0.7T S A1D -80 0.5T N UT F LAN G E M 4 M F ZN T 1 T R S 4*8 T B -W M F ZN T 1 T R S 4*8 T B -W M F ZN P.P
Q'TY
1 1 3 1 1 1 2 1 1 1 1 1 1 1 1 2 2 1 1 1 1 1 4 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 4 1
REMA RK
PRINTED WIRING BOARD
1. CIRCUIT CHECK PROCEDURE
(1) Low Voltage Transformer(DMR-101FS) check - The low voltage transformer is located on the P.C.B. - Measuring condition (input voltage) : 230 VAC / 50 Hz
KOC-970T/980T L.V.T. : DMR-101FS
Terminal
Voltage 230VAC/50Hz 13.0 VAC 35.0 VAC 3.0 VAC
1-2 4-5 6-7 8 - 10
· Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage. · The allowable tolerance of the secondary voltage is within ±5% of normal voltage. (2) Voltage check - Key check point ( 1~4:Micom Pin, 5:Display Pin )
NO
1 2
CHECK POINT
P IN 63, 64 P IN 29, 32, 62 0V -5 VD C ± 5%
REMARK
3
P IN 45
4
P IN 30, 31
5
P IN 1, 25
2.6 VAC (D isplay filam ent voltage)
- Check method
NO
1 2 3 -5 V D C -12 V DC -27 V DC
VOLTAGE
R eplace R24, J3, Q 10 R eplace D1~D6, J8 R eplace R28, R 29, ZD 4
REMARK KOC-970T/980T
NOTE
The m arks of the above corresponding voltages (+5, +12, -24VD C) are written on the PC B . Each m easuring points m ust be m easured with G ND points.
PRINTED WIRING BOARD
(3) Display Problems
NO
1 2 3
CAUSE
P oor contact between P.C .B. and display filam ent The display has som e trouble in its segm ent orgrid Loss vacuum in the display
MEASUREMENT
C heck the voltage of display pin 1 & 25 R efer to The display trouble shooting data below Find white spot
RESULT
2.6 VA C
REMEDY
Fix the pin 1 & 25 on the P.C.B . Replace P.C .B. assem bly Replace P.C .B. assem bly
- The display trouble shooting data
TROUBLE
M /W & AU TO C O O K don't com e on. G R ILL & P IE don't com e on. CO M B I & TE M P CO O K don't com e on. W E IG H T DE FRO ST & K g don't com e on. TIM E D EFRO ST don't com e on. Segm ent a doesn't com e on from G 1 to G 5 Segm ent b doesn't com e on from G 1 to G 5 Segm ent c doesn't com e on from G 1 to G 5 Segm ent d doesn't com e on from G 1 to G 5 Segm ent e doesn't com e on from G 1 to G 5 Segm ent f doesn't com e on from G 1 to G 5 Segm ent g doesn't com e on from G 1 to G 5 Segm ent h doesn't com e on from G 1 to G 5 Segm ent i doesn't com e on from G 1 to G 5
DISPLAY NAME & PIN NO.
G rid 1 (G 1), 21 G rid 2 (G 2), 17 G rid 3 (G 3), 14 G rid 4 (G 4), 10 G rid 5 (G 5), 4,7 Segm ent a, 23 Segm ent b, 22 Segm ent c, 20 Segm ent d, 19 Segm ent e, 18 Segm ent f, 16 Segm ent g, 15 Low er bar h, 5 Upper bar i, 6,8,9,11
MICOM OUTPUT IN PIN NO.
24 17 18 16 13 26 25 23 22 21 20 19 14 15
PRINTED WIRING BOARD
(4) Case of no microwave oscillation (a) Situation : When touching M/W button, oven lamp turns on, fan motor and turntable motor rotate and cook indicator in the display comes on. CAUSE : Relay 3 (RY3) does not operate.
KOC-970T/980T
- Check method
STAGE
R E LAY 3 O N R E LAY 3 O FF -5 VD C GND
POINT A
GND -12 V D C
POINT B
(b) Situation : When touching M/W button, oven lamp does not turn on and turntable motor does not rotate but cook indicator in the display comes on. CAUSE : Relay 4 (RY4) does not operate.
KOC-970T/980T
- Check method
STAGE
R E LAY 4 O N R E LAY 4 O FF -5 VD C GND
POINT A
GND -12 V D C
POINT B
(c) Situation : When touching M/W button, oven lamp turns on and fan motor does not rotate but cook indicator in the display comes on. CAUSE : Relay 5 (RY5) does not operate.
KOC-970T/980T
PRINTED WIRING BOARD
- Check method
STAGE
R E LAY 5 O N R E LAY 5 O FF -5 VD C GND
POINT A
GND -12 V D C
POINT B
(5) Case of no heating of upper heater When touching "TEMP COOK & COMBI" button, oven lamp turns on, fan motor and turntable motor rotate and cook indicator in the display comes on. CAUSE : Relay 2 (RY2) does not operate.
KOC-970T/980T
- Check method
STAGE
R E LAY 2 O N R E LAY 2 O FF -5 VD C GND
POINT A
GND -12 V D C
POINT B
(6) Case of no heating of lower heater When touching TEMP COOK & PIE button, oven lamp turns on, fan motor and turntable motor rotate and cook indicator in the display comes on. CAUSE : Relay 6 (RY6) does not operate.
KOC-970T/980T
- Check method
STAGE
R E LAY 6 O N R E LAY 6 O FF -5 VD C GND
POINT A
GND -12 V D C
POINT B
PRINTED WIRING BOARD
(7) Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop.
KOC-970T/980T
- Check method
STAGE
Door opened Door closed O pen Closed
POINT A
-5 V DC G ND
POINT B
NOTE
C heck the state (O N , O FF) of the secondary interlock sw itch by resistance m easurem ent.
(8) Case of appearring Err6 on the display
KOC-970T/980T
- Check method
POINT W AVEFORM
A
B
C
NOTE
If clock does not keep exact tim e, you m ust check Diode D7 & Transistor Q 2.
P.C.B. CIRCUIT DIAGRAM
1. KOC-970T/980T
P.C.B. CIRCUIT DIAGRAM
2. KOC-970T/980T PCB ASS'Y PART LIST
NAME
PC B TR A N S P O W ER HO LDE R VFD BU ZZE R D IG ITR O N RE S O N ATO R C ER A IC M IC O M R C AB O N FILM R C AB O N FILM R C AB O N FILM R C AB O N FILM R C AB O N FILM R C AB O N FILM R C AB O N FILM R C AB O N FILM R C AB O N FILM R C AB O N FILM R C AB O N FILM R C AB O N FILM R C AB O N FILM R C AB O N FILM R C AB O N FILM DIO DE SW ITCH ING DIO DE RE CTIFIE R DIO DE ZE NER DIO DE ZE NER DIO DE ZE NE R DIO DE ZE NER C E LE C TR O C E LE C TR O C E LE C TR O C A RR AY C C ER A A XIA L C C ER A A XIA L C C ER A A XIA L BZ1 DP1 CR 1 IC1 M 208 M 209 LV T1
SYMBOL
SPECIFCATION
92X 195 86X 159.5 D M R -101FS PP B M -20K S VM -5S S13 C ST4.00M G W M B89143A P -218,970T M B89143A P -244,980T
PART CODE
3514314920 3514314930 5E P V041351 3513002600 3515600100 D S VM 5SS 135P C ST400M G 141SC 870T0 141SC 980T0 RD -4Z472JRD -4Z104JRN -4Z103JRD -4Z202JRD -4Z102JRD -4Z479JRD -AZ563JRD -AZ103JRD -AZ472JRD -AZ102JRD -AZ331JRD -AZ511JRD -AZ101JRN -4Z1002F RN -4Z1203F DZN4148M DZN4002A -DZTZ3R9BDZTZ5R6BDZTZ27B -DZTZ4R7BCE XE 1H 100A CE XF1V102V CE XF1H221V CN 7X B -102M CC KF1H104Z CC ZB 1H102Z CC KF1H473Z
Q TY
1 1 1 1 1 1 1 1 1 1 1 3 2 5 1 1 4 4 2 1 1 1 1 1 1 10 1 1 1 1 1 1 2 1 10 2 2
R17 R22 R13,18,21 R28,29 R12,19,20,27,30 R31 R11 R3,4,14,15 R5,6,7,9 R2,8 R10 R16 R1 R23 R24 D7 D2~6,D 8~12 ZD 1 ZD 2 ZD 3 ZD 4 EC 1 EC 4 EC 2,E C 3 CA 1 C1,4,5~9,12~14 C10,11 C2,3
1/4W, 4.7K O H M J 1/4W, 100K O H M J 1/4W,10K O HM J 1/4W,2K O H M J 1/4W,1K O H M J 1/4W,4.7 O H M J 1/6W,20K O HM J 1/6W,10K O HM J 1/6W,4.7K O HM J 1/6W,1K O H M J 1/6W,330 O HM J 1/6W,510 O HM J 1/6W,100 O HM J 1/4W,10K O HM F 1/4W,120K O H M F 1N4148M 1N4002A M TZ 3.9B U Z 5.6B M TZ 27B M TZ 4.7B R S 50V 10 U F R SS 35V 1000 U F R SS 50V 220 U F 8P(7)50V 1000 P F H 1K F 50V 0.1uFZ H 1K F 50V 1000pZ H 1K F 50V 0.47uF
P.C.B. CIRCUIT DIAGRAM
NAME
CO NN EC TO R W AFE R CO NN EC TO R W AFE R CO NN EC TO R W AFE R CO NN EC TO R FILM TR A N S IS TO R TR A NS IS TO R TR A N S IS TO R RE LAY R E LAY R A RR AY CO NN EC TO R FILM SW TA CT SW RO TA RY CN 2 CN 1 CN 4 CN 3
SYMBOL
SPECIFCATION
35312-0310 35313-0210 35328-0610 H LE M 15S-1 K TA 1270Y K RA 102M K R C 102M G 5J-1-TP-M -D T-12 G 5B -1-12V 8P (7) 1/8 100K J H LE M 15R-1 K PT-1115AM S DB 161VB 17F-12-36-36P C(PITCH 5)
PART CODE
30166M 5030 30166M 7020 4C W 3061M X 0 4C W 215SBD 0 TZTA 1270YTZRA 102M TZR C 102M 5S C 0101112 5S C 0101110 RA -88X 104J 4C W 21RB D0 5S 50101Z93 5S 10109002
Q TY
1 1 1 1 3 5 2 2 3 3 1 12 1
Q 1,2,10 Q 6~9,11 Q 3,4 RY 2,RY 3 RY 4~6 RA 1~R A3 CN 101 SW 101~112 EN 101
DAEWOO ELECTRONICS CO., LTD
686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX : DWELEC K28177-8 CABLE : "DAEWOOELEC" E-mail : [email protected] FAX : 02) 360-8184 TEL: 02) 360-8178~8182 S/M NO. : C970T1S001 PRINTED DATE : JUL. 19988