Daewoo KOR-6Q4R5S Service manual

Daewoo KOR-6Q4R5S Service manual
S/M No. :G6C4R5S001
Service Manual
Microwave Oven
Model: KQG-6C4R5S
KQG-6C5R5S
✔ Caution
: In this Manual, some parts can be changed for improving,
their performance without notice in the parts list. So, if you
need the latest parts information, please refer to PPL(Parts
Price List) in Service Information Center .
Apr. 2005
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and
sealing surfaces (arcing, wear, and other damage), (4) Damage to or loosening of hinges and latches, (5)
Evidence of dropping or abuse.
(c) Before turning on power to the microwave oven for any service test or inspection within the microwave generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation
and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual
before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the owner.
TABLE OF CONTENTS
SAFETY AND PRECAUTIONS....................................................................................................................................................................2
SPECIFICATIONS .........................................................................................................................................................................................3
EXTERNAL VIEW (KQG-6C4R5S)..............................................................................................................................................................4
INSTALLATION .............................................................................................................................................................................................8
OPERATIONS AND FUNCTIONS...............................................................................................................................................................9
DISASSEMBLY AND ASSEMBLY............................................................................................................................................................10
INTERLOCK MECHANISM AND ADJUSTMENT...................................................................................................................................20
TROUBLESHOOTING GUIDE...................................................................................................................................................................21
MEASUREMENT AND TEST.....................................................................................................................................................................25
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT........................................................................25
2. MICROWAVE RADIATION TEST ..................................................................................................................26
3. COMPONENT TEST PROCEDURE ..............................................................................................................27
WIRING DIAGRAM......................................................................................................................................................................................28
PRINTED CIRCUIT BOARD.......................................................................................................................................................................29
1. CIRCUIT CHECK PROCEDURE....................................................................................................................29
2. P.C.B. CIRCUIT DIAGRAM ............................................................................................................................34
3. P.C.B. LOCATION NO....................................................................................................................................35
EXPLODED VIEW AND PARTS LIST ......................................................................................................................................................36
1
SAFETY AND PRECAUTIONS
1. FOR SAFE OPERATION
Damage that allows the microwave energy (that cooks or heats the food) to escape will result in poor cooking and may
cause serious bodily injury to the operator.
IF ANY OF THE FOLLOWING CONDITIONS EXIST, OPERATOR MUST NOT USE THE APPLIANCE.
(Only a trained service personnel should make repairs.)
(1) A broken door hinge.
(2) A broken door viewing screen.
(3) A broken front panel, oven cavity.
(4) A loosened door lock.
(5) A broken door lock.
The door 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.
(a) inform the manufacturer, importer or assembler,
(b) repair the unit at no cost to the owner,
(c) attempt to ascertain the cause of the excessive leakage,
(d) tell the owner of the unit not to use the unit until the oven has been brought into compliance.
3. If the oven operates with the door open, the service person should tell the user not to operate the oven and contact
the manufacturer and CDRH immediately.
IMPORTANT
The wire in this mains lead coloured in accordance with the following code.
Green-and-yellow : Earth
Blue
: Neutral
Brown
: Live
As the colours of the wires in the manins lead of this appliance may not correspond with the coloured markings
identifying the terminals in your plug, proceed as follows.
The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked with
the letter ‘E’, earth symbol or coloured green-and-yellow.
The wire which is coloured blue must be connected to the terminal which is marked with the letter ‘N’ or coloured
black.
The wire which is coloured brown must be connected to the terminal which is marked with the letter ‘L’ or
coloured red.
NOTE :
The oven is designed for counter-top use only.
2
SPECIFICATIONS
MODEL
KQG-6C4R5S / KQG-6C5R5S
POWER SUPPLY
POWER
CONSUMPTION
230V~50Hz, SINGLE PHASE WITH EARTHING
MICROWAVE
1200 W
GRILL
1050 W
COMBINATION
2200 W
MICROWAVE ENERGY OUTPUT
800W
MICROWAVE FREQUENCY
2450MHz
OUTSIDE DIMENSIONS (WXHXD)
465X279X384mm
CAVITY DIMENSIONS (WXHXD)
290X220X306mm
NET WEIGHT
APPROX. 13.7Kg
TIMER
60 min. 00 sec.
POWER SELECTIONS
10 LEVELS
CAVITY VOLUME
0.7 Cu.Ft.
* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.
3
EXTERNAL VIEW (KQG-6C4R5S)
1. OUTER DIMENSION
2. FEATURE DIAGRAM
1 Door seal - Door seal maintains the microwave energy
within the oven cavity and prevents microwave leakage.
8 Roller guide - This must always be used for cooking
together with the glass cooking tray.
2 Cover Heater
9 Glass cooking tray - Made of special heat resistant
glass. Food in a proper receptacle is placed on this tray
for cooking.
3 Heating Element
4 Oven cavity
0 Door viewing screen - Allows viewing of food. The
screen is designed so that light can pass through, but not
the microwave.
5 Safety interlock system
6 Metal Rack
q Door hook - When the door is closed, it will automatically
shut off. If the door is opened while the oven is operating,
the magnetron will immediately stop operating.
7 Coupler - This fits over the shaft in the center of the
ovens cavity floor. This is to remain in the oven for all
cooking.
4
EXTERNAL VIEW (KQG-6C5R5S)
1. OUTER DIMENSION
2. FEATURE DIAGRAM
1 Door seal - Door seal maintains the microwave energy
within the oven cavity and prevents microwave leakage.
8 Roller guide - This must always be used for cooking
together with the glass cooking tray.
2 Cover Heater
9 Glass cooking tray - Made of special heat resistant
glass. Food in a proper receptacle is placed on this tray
for cooking.
3 Heating Element
4 Oven cavity
0 Door viewing screen - Allows viewing of food. The
screen is designed so that light can pass through, but not
the microwave.
5 Safety interlock system
6 Metal Rack
q Door hook - When the door is closed, it will automatically
shut off. If the door is opened while the oven is operating,
the magnetron will immediately stop operating.
7 Coupler - This fits over the shaft in the center of the
ovens cavity floor. This is to remain in the oven for all
cooking.
5
3. CONTROL PANEL (KQG-6C4R5S)
y
w
r
a
e
s
p
d
t
i
u
o
w Auto cook - Used to cook using a program or to
reheat.
i Start/Express cook - Used to start the oven operation
and also increase the reheat time by 30 seconds.
e Micro Power - Used to set power level.
o Dial knob - Used to set the time and weight.
r Auto Defrost - Used to defrost foods by weight.
p Quick Defrost - Used to defrost food very Quickly.
t Clock - Used to set clock.
a Chilled Meal - Used to reheat the meal.
y Display - Cooking time, power level, indicators and
present time are displayed.
s Frozen Meal - Used to reheat the meal.
d Grill/Combi -Used to cook grill/combi.
u Stop/Clear - Used to stop the oven operation or to
erase all entries.
6
(KQG-6C5R5S)
y
r
w
e
a
p
s
t
d
o
u
i
w Auto cook - Used to cook using a program or to
reheat.
i Start/Express cook - Used to start the oven operation and also increase the reheat time by 30 seconds.
e Micro Power - Used to set power level.
o Dial knob - Used to set the time and weight.
r Auto Defrost - Used to defrost foods by weight.
p Quick Defrost - Used to defrost food very Quickly.
t Clock - Used to set clock.
a Chilled Meal - Used to reheat the meal.
y Display - Cooking time, power level, indicators and
present time are displayed.
s Frozen Meal - Used to reheat the meal.
u Stop/Clear - Used to stop the oven operation or to
erase all entries.
d Grill/Combi -Used to cook grill/combi.
7
INSTALLATION
1. Steady, flat location
This microwave oven should be set on a steady, flat surface.
This microwave oven is designed for counter top use only.
2. Leave space behind and side
All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually,
cause oven failure.
3. Away from Radio and TV sets
Poor television reception and radio interference may result if the oven is located close to a TV, Radio, antenna or feeder
and so on.
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 10 amperes, 230Volts, 50Hz grounded outlet.
➢ Power supply cord is about 0.8 meters long.
➢ The voltage used must be the same as specified on this oven. Using a higher voltage may result in a fire or other accident causing oven damage. Using low voltage will cause slow cooking, We are not responsible for damage resulting from
use of this oven with a voltage of ampere fuse other than those specified.
➢ This appliance is supplied with cable of special type, which, if samaged, must be repaired with cable of same type.
Such a cable can be purchased from DAEWOO and must be installed by a Qualified Person.
6. Examine the oven after unpacking for any damage such as:
A misaligned door, broken door or a dent in cavity.
If any of the above are visible, DO NOT INSTALL, and notify dealer immediately.
7. Do not operate the oven if it is colder than room temperature
(This may occur during delivery in cold weather.) Allow oven to become room temperature before operating.
EARTHING INSTRUCTIONS
This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of the electric shock
by providing an escape wire for the electric current. This 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 ant earthed.
WARNING
Improper use of the earthing plug can result in a risk of electric shock. Consult a qualified electrician or serviceman if
the earthing instructions are not completely understood, or if doubt exists as to whether the appliance is properly
earthed, and either:If it is necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade
earthing plug, and a 3-slot receptacle that will accpt the plug on the appliance. The marked rating of the extension
cord should be equal to or greater than the electrical rating of the appliance, or Do not use an extension cord.
8
OPERATIONS AND FUNCTIONS
This section includes useful information about oven operation.
the STOP/CLEAR is pressed during the oven operation,
1 Plug power supply cord into 230V AC 50Hz power outlet. 8 When
the oven stops cooking and all information retained. To erase
placing the food in a suitable container, open the
all information(except the present time), press the
2 After
oven door and put it on the glass tray.
STOP/CLEAR once more. If the oven door is opened during
The glass tray and roller guide must always be in place
during cooking.
3
oven door can be opened at any time during operation
4 The
by pulling the door. The oven will automatically shut off. To
Close the door. Make sure that it is firmly closed.
the oven operation, all information is retained.
oven will not start cooking until the door is completely
9 The
closed or the program has been reset.
NOTE : When using the GRILL or COMBI mode;
• Do not open the door so often, the temperature inside the
oven decrease and the cooking may not be completed in
setting time.
• Never touch the oven window and metal interior of the oven
when taking food in and out, because the temperature
inside the oven and door is very high.
• When using these modes, be careful as the tray will be hot
to touch, use oven gloves or pot holders while handling tray.
restart the oven, close the door and then press START.
oven automatically cooks on full power unless set to
5 The
a lower power level.
6 The display will show “ : 0” when the oven is plugged in.
clock returns to the present time when the cooking
7 Time
time ends.
Make sure the oven is properly installed and plugged
into the electrical outlet.
WATTAGE OUTPUT CHART
• The power-level is set by pressing the Power button. The chart shows the display, the power level and the percentage of
power.
Press Power button
Power level (Display)
Approximate Percentage of Power
once
P-HI
100%
twice
P-90
90%
3 times
P-80
80%
4 times
P-70
70%
5 times
P-60
60%
6 times
P-50
50%
7 times
P-40
40%
8 times
P-30
30%
9 times
P-20
20%
10 times
P-10
10%
11 times
P-00
0%
9
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 grounding.
Do not operate on a 2-wire extension cord.
The microwave oven is designed to be used with grounded.
It is imperative, therefore, to make sure it is grounded
properly before beginning repair work.
(2) Warning about the electric charge in the high voltage capacitor.
For about 30 seconds after the operation stopped and electric
charge remains in the high voltage capacitor.
When replacing or checking parts, short between oven chassis
and the negative high terminal of the high voltage capacitor, by
using a properly insulated screwdriver to discharge.
4. When the 15A fuse is blown out due to the operation of the monitor
switch; replace primary interlock switch, secondary interlock switch
and interlock monitor switch.
5. After repair or replacement of parts, make sure that the screws are
properly tightened, and all electrical connections are tightened.
6. Do not operate without cabinet.
SHORT
CAUTION : Service personnel should remove their watches whenever working close to or replacing the magnetron.
CAUTION : When servicing the appliance, need a care of touching or replacing high potential parts because of
electrical shock or exposing microwave. These parts are as follows - HV Transformer, Magnetron,
HV Capacitor, HV Diode, HV fuse.
10
1. To remove cabinet
1) Remove three screws on cabinet back.
2) Push the cabinet backward.
2. To remove door assembly
1) Remove a screws which secure the stopper hinge top.
2) Remove the door assembly from top plate of cavity.
3) Reverse the above for reassembly.
NOTE : After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate.
11
3. To remove door parts.
REF NO.
PART CODE
PART NAME
DESCRIPTION
Q'TY
A01
3511614900
DECORATOR DOOR AS
KOR-6Q4R5S
1
A02
3512209000
FRAME DOOR
ABS SG-0760D SG-175
1
A03
3517009100
BARRIER-SCREEN *O
SAN CR-5381 SMOG
1
A04
3515204100
STOPPER HINGE *T AS
KOR-63150S
1
A05
3511719500
DOOR PAINTING AS
KOR-6C0B5S
1
A06
3517002800
BARRIER-SCREEN *I
POLYESTER T0.1
1
A07
3512300210
GASKET DOOR
PP
1
A08
3513100730
HOOK
POM BLACK
1
A09
3515101320
SPRING HOOK
HSW-3
1
A10
3513100730
SCREW TAPPING
T2S TRS 4X12 MFZN
2
HANDLE DOOR
ABS SG-0760D SG-175
A11
3512605610
3512605640
(1) Remove the gasket door from door weld as.
(2) Remove the barrier screen inner from door weld as.
(3) Remove the door frame from door weld as.
(4) Remove the stopper hinge top from door weld as.
(5) Remove the spring and the hook.
(6) Remove the barrier screen outer from door frame.
(7) Remove the decorator door from door frame.
(8) Reverse the above steps for reassembly.
12
REMARK
1
KOR-6Q4R5S
1
KOR-6Q5R5S
4. Method to reduce the gap between the door seal and
the oven front surface.
(1) To reduce gap located on part ‘A’
• Loosen two screws on stopper hinge top, and then
push the door to contact the door seal to oven front
surface.
• Tighten two screws.
(2) To reduce gap located on part ‘B’.
• Loosen three screws on bottom hinge, and then the
door to contact the door seal to oven front surface.
• Tighten three screws.
NOTE: A small gap may be acceptable if the microwave leakage does not exceed 4m W/cm2.
13
5. To remove control panel parts. (KQG-6C4R5S)
REF NO.
PART CODE
PART NAME
DESCRIPTION
Q’TY
B01
3513408400
KNOB VOLUME
ABS SG-175 SG-0760D
1
B02
3515501550
WINDOW DISPLAY
SAN CR-5381 SMOG
1
B03
3511614200
DECORATOR C-PANEL
STS430 T0.5 H/L
1
B04
3516732300
CONTROL-PANEL
ABS SG-175 SG-0760D
1
B05
3516913500
BUTTON FUNCTION-B
ABS SG-175 SG-0760D
2
B06
3516913400
BUTTON FUNCTION-A
ABS SG-175 SG-0760D
1
B07
PKBPMSBD00
PCB BUTTON MANUAL AS
KOR-6Q4R5S
1
B08
PKMPMSBD50
PCB MAIN MANUAL AS
KQG-6C4R5S
1
B09
7122401211
SCREW TAPPING
T2S TRS 4X12 MFZN
4
B10
7621301011
SCREW TAPPING
T2 PAN 3X10 PW MFZN
4
REMARK
1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
2) Remove screws which secure the PCB assembly to control panel.
3) Disconnect membrane tail from the connector of the PCB assembly.
4) Detach the function buttons and knob from the control panel.
5) Reverse the above steps for reassembly.
14
(KQG-6C5R5S)
REF NO.
PART CODE
PART NAME
DESCRIPTION
Q’TY
B01
3513408420
KNOB VOLUME
ABS SG-175 SG-0760D
1
B02
3515502400
WINDOW DISPLAY
SAN CR-5381 SMOG
1
B03
3511614200
DECORATOR C-PANEL
STS430 T0.5 H/L
1
B04
3516732350
CONTROL-PANEL
ABS SG-175 SG-0760D
1
B05
3516913520
BUTTON FUNCTION-B
ABS SG-175 SG-0760D
2
B06
3516913420
BUTTON FUNCTION-A
ABS SG-175 SG-0760D
1
B07
PKBPMSF100
PCB BUTTON MANUAL AS
KOR-6Q4R5S
1
B08
PKMPMSF150
PCB MAIN MANUAL AS
KQG-6C4R5S
1
B09
7122401211
SCREW TAPPING
T2S TRS 4X12 MFZN
4
B10
7621301011
SCREW TAPPING
T2 PAN 3X10 PW MFZN
4
REMARK
1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
2) Remove screws which secure the PCB assembly to control panel.
3) Disconnect membrane tail from the connector of the PCB assembly.
4) Detach the function buttons and knob from the control panel.
5) Reverse the above steps for reassembly.
15
6. To remove high voltage capacitor.
1) Remove a screw which secure the grounding ring
terminal of the H.V. diode and the capacitor holder.
2) Remove the H.V. diode from the capacitor holder.
3) Reverse the above steps for reassembly.
◆ High voltage circuit wiring
7. To remove magnetron.
1) Remove a screw which secure the magnetron.
2) Remove the magnetron.
3) Reverse the above steps for reassembly.
NOTE : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage.
It shall not exceed 4mW/cm2 for a fully assembled oven with door normally closed.
16
8. To remove wind guide assembly.
1) Remove a screw for earthing.
2) Remove the noise filter from the wind guide.
3) Remove a screw which secure the wind guide assembly.
4) Draw forward the wind guide assembly.
5) Pull the fan from the motor shaft.
6) Remove two screws which secure the motor shaded pole.
7) Remove the motor shaded pole.
8) Reverse the above steps for reasembly.
9. To remove H.V.transformer.
1) Remove four screws holding the H.V.transformer.
2) Remove the H.V.transformer.
3) Reverse the above steps for reassembly.
17
10. To remove tray motor
1) Remove the coupler in the cavity.
2) Turn the set upside down.
3) Cut the tray motor cover part from the base plate.
4) Remove the tray motor cover.
5) Remove a screw which secure the tray motor.
6) Remove the tray motor.
7) Reverse the above steps for reassembly except for securing the tray motor cover with screw.
11. To remove heater assembly
1) Remove one side of the heater harness.
2) Remove a screw which secure the cover insulator top.
3) Remove the cover insulator top.
4) Remove the heater top assembly.
5) Reverse the above steps for reassembly.
18
✔ Caution : In this Manual, some parts can be changed for improving, their performance without notice in the parts
list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service
Information Center (http://svc.dwe.co.kr).
12. To remove heater parts
C01
C02
C03
C04
C05
HEATER TOP ASSEMBLY : 3512803600
REF NO.
PART CODE
PART NAME
DESCRIPTION
C01
3512765100
HARNESS HEATER
KOC-970T1S TEFLON
1
C02
7112401011
SCREW TAPPING
T1 TRS 4X10 MFZN
2
C03
3510607800
BRACKET HEATER *T
SBHG T0.5
2
C04
3512803700
HEATER MIRACLON
115V AC 500W
2
C05
3511408100
COVER HEATER *T
STS430 T0.5
1
19
Q’TY
REMARK
INTERLOCK MECHANISM AND ADJUSTMENT
The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when
the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave.
(1) Primary interlock switch
When the door is closed, the hook locks the oven door. If the door is not closed properly, the oven will not operate.
When the door is closed, the hook pushes the button of the microswitch. Then the button of the primary interlock switch
bring it under ON condition.
(2) Secondary interlock switch and interlock monitor switch
When the door is closed, the hook pushes the lock lever downward. The lock lever presses the button of the interlock
monitor switch to bring it under NO condition and presses the button of the secondary interlock switch to bring it under
ON condition.
ADJUSTMENT :
Interlock monitor switch
When the door is closed, the interlock monitor switch should be changed (NO condition) before other switches are closed.
When the door is opened, the interlock monitor switch should be changed (NC condition) after other switches are opened.
(3) Adjustment steps
a) Loosen the one mounting screw.
b) Adjust interlock switch assembly position.
c) Make sure that lock lever moves smoothly after adjustment is completed.
d) Tighten completely two mounting screws.
NOTE :
Microwave emission test should be performed after adjusting interlock mechanism.
If the microwave emission exceed 4mW/cm2, readjust interlock mechanism.
20
TROUBLESHOOTING 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) When checking the continuity of the switches, fuse or high voltage transformer, disconnect one lead wire from these parts
and check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.
NOTE
When electric parts are checked, be sure the power cord is not inserted the wall outlet.
Check wire hamess, wiring and connected of the terminals and power cord before check the parts listed below.
(TROUBLE 1) Oven does not operate at all : any inputs can not be accepted.
CONDITION
Fuse blows.
CHECK
RESULT
Check continuty of interlock
monitor switch with door closed
(COM ↔ NC)
Continuity
CAUSE
Malfunction of
interlock monitor
switch
REMEDY
Replace
NOTE 1
No Continuity
Check continuity of both primary
and secondary interlock switch
with door colosed
No Continuity
Continuity
Continuity
Check continuity of primary
interlock switch contact with door
partially open until interlock
monitor switch contact close
(COM ÷ NC)
0Ω or infinite
Check continuity of primary winding of low voltage transformer
Approx.
150~310
(normal)
Disconnect high voltage fuse and
operate the unit
Fuse again
blows
21
Replace
Malfunction of
interlock switch
Shorted contacts
of primary
interlock switch.
Defective low
voltage
transformer
Defective high
voltage
transformer
NOTE 1
Replace
NOTE 1
Replace
Replace
CONDITION
Outlet has
proper voltage Fuse
does not
blow.
CHECK
RESULT
CAUSE
REMEDY
No
Continuity
Defective
magnetron
Replace
Check continuity of magnetron
Check continuity of
noise filter board
No
Continuity
Defective line
filter board
Replace
Check continuity of
power supply cord
No
Continuity
Open power
supply cord
Replace
Normal
Defective touch
control circuit
Replace
NOTE
Akk these switches must be replaced at the same time, please refer to "Interlock Mechanism And Adjustment".
(TROUBLE 2) Display shows all figures selected, but oven does not start cooking, even though
desired program and time are set and start pad is tapped.
CONDITION
Turn table
motor and
oven lamp do
not turn on
CHECK
RESULT
CAUSE
REMEDY
Check continuity of primary
interlock switch
No
Continuity
Malfunction of
primary interlock
switch
Adjust or
replace
Check continuity of secondary
interlock and D.O.M. switches
No
Continuity
Malfunction of
primary interlock
and D.O.M.
switch
Adjust or
replace
0V
Check D.C. voltage being supplied
to RELAY (RY2) coil
Approx.
15 VDC
22
Defective touch
control circuit
Faulty contacts of
RELAY (RY2) or
open relay coil
Replace
Replace
(TROUBLE 3) No microwave oscillation even though fan motor rotates.
CONDITION
CHECK
RESULT
No
microwave
oscillation
Check continuity of high
voltage fuse
No
Continuity
CAUSE
REMEDY
Replace high voltage fuse
Check continuity if high
voltage capacitor terminals
with wires removed
Continuity
Defective high
voltage
transformer
Replace
Check continuity of high voltage
rectifier in forward and backward
direction with DC megger
Continuity in
backward
direction
Defective high
voltage rectifier
Replace
Connect megger leads to
magnetron terminal and
magnetron body
Continuity
Defective
magnetron
Replace
Defective high
voltage
transformer
Replace
0 Ω or ∞
Check resistance of primary and
secondary coil of high voltage
transformer
No
Continuity
Check continuity of magnetron
with wires removed
No
Continuity
Check continuity of filament
terminal of high voltage
transformer
Defective
magnetron
Defective high
voltage
transformer
0V
Check D.C. voltage being
supplied to RELAY (RY1) coil
Defective touch
control circuit
Approx
15 VDC
23
Faulty
contacts or RELAY
(RY1)
or open
relay coil
Replace
Replace
Replace
Replace
(TROUBLE 4) The following visual conditions inditions indicate a probable defective touch control
circuit or membrane switch assembly
1. Incomplete segments,
1) Segments missing.
2) Partical segments missing.
3) Digit flickering other than normal display slight flickering.
4) " :0" does not display when power is on.
2. A distinct change in the display are not on when they numbers is 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.
5. Specific numbers (for example 2 or 3) will not display when the panel is touched.
6. Display does not count down or up with time cooking or clock operation.
7. Oven is programmable and cooks normally but no display shows.
8. Display obviously jumps in time while counting down.
9. Display counts down noticeable too fast while cooking.
10. Display does not show the time of day when dlear pad is touched.
11. Oven lamp and turntable motor do not stop although cooking is finished. Check if the TELAY 2 contacts close if they are
close, replace touch control circuit.
CONDITION
CHECK
Display does
not show programming at
all, even if
keyboard is
touched.
Check rach pad for
continuity of the membrane keyboard for the following keyboard
check procedure
RESULT
Normal
Abnormal
CAUSE
REMEDY
Malfunction
of touch
control circuit
of control box
sub-assembly
Replace control
box subassembly
Malfunction
of the membrane
keyboard
Replace the
membrane keyboard
NOTE
Before following the particular steps listed above in the trouble shooting guide for the membrane keyboard's, failure,
please check for the continuity of each wire-harness between the membrane keyboard and P.C.B. assembly.
24
MEASUREMENT AND TEST
1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT
Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water
exposed to the microwave as directed below.
PROCEDURE
1. Microwave power output measurement is made with the microwave oven
supplied at rated voltage and operated at its maximum microwave power
setting with a load of 1000±5cc of potable water.
2. The water is contained in a cylindrical borosilicate glass vessel having a
maximum material thickness of 3 mm and an outside diameter of approximately 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. (Refer to table as following)
Heating time is measured while the microwave generator is operating at full power.
The filament heat-up time for magnetron is not included.
6. The initial and final temperature of water is selected so that the maximum difference between the ambient and final
water temperature is 5K.
7. The microwave power output P in watts is calculated from the following formula :
P=4187 X ▲T/t
• ▲T is difference between initial and ending temperature.
• t is the heating time.
The power measured should be B (Refer to SPECIFICATIONS)W±10.0%.
CAUTION :
1. Water load should be measured exactly to 1 liters.
2. Input power voltage should be exactly specified voltage (Refer to SPECIFICATIONS)
3. Ambient temperature should be 20 ± 2°C (68 ± 3.6°F)
Heating time for power output:
A(second)
70
64
60
56
52
49
47
44
42
40
38
B(W)
600
650
700
750
800
850
900
950
1000
1050
1100
25
2. MICROWAVE RADIATION TEST
CAUTION :
1. Make sure to check the microwave leakage before and after repair of adjustment.
2. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy.
3. Do not place your hands into any suspected microwave radiation field unless the safe density level is known.
4. Care should be taken not to place the eyes in direct line with the source of microwave energy.
5. Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit
under the test.
PROCEDURES
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 600cc glass beaker with an inside diameter of approx.
95mm(3.5in.).
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.
1) Measured radiation leakage must not exceed the value
prescribed below. Leakage for a fully assembled oven
with
door normally closed must be less than 4mW/cm2.
2) When measuring the leakage, always use the
5cm(2in.) space cone with probe. Hold the probe perpendicular to
the cabinet and door.
Place the space cone of the probe on the door, cabinet,
door seem, door viewing screen, the exhaust air vents
and the suction air vents.
3) Measuring should be in a counter-clockwise direction at
a rate of 1 in./sec. If the leakage of the cabinet door
seem is
unknown, move the probe more slowly.
4) When measuring near a corner of the door, keep the
probe perpendicular to the areas making sure the
probe end at the base of the cone does not get closer
than 2 in. from any metal. If it does not, erroneous
reading may result.
26
3. COMPONENT TEST PROCEDURE
• High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle.
• It is neither necessary nor advisable to attempt measurement of the high voltage.
• Before touching any oven components or wiring, always unplug the oven from its power source and discharge the
capacitor.
1. High voltage transformer
(1) Remove connections from the transformer terminals and check continuity.
(2) Normal readings should be as follows:
Secondary winding ...................Approx. 110Ω±10%
Filament winding....................................Approx. 0Ω
Primary winding .....................................Approx. 1Ω
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 10MΩ once the capacitor is charged.
(3) A shorted capacitor will show continuous continuity.
(4) An open capacitor will show constant 10MΩ.
(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 KΩ in the other direction.
4. Magnetron
For complete magnetron diagnosis, refer to “Measurement of the Microwave Power Output”.
Continuity checks can only indicate and open filament or a shorted magnetron.
To diagnose for an open filament or a shorted magnetron.
(1) Isolate magnetron from the circuit by disconnecting the leads.
(2) A continuity check across magnetron filament terminals should indicate 0.1Ω 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.
27
WIRING DIAGRAM
28
PRINTED CIRCUIT BOARD
1. CIRCUIT CHECK PROCEDURE
1. Low voltage transformer check
• The low voltage transformer is located on the P.C.B.
• Measuring condition: input voltage : 230V/Frequency : 50Hz
Terminal Voltage
LOAD
NO LOAD
5-6-7
AC 12.6 V
AC 14.7 V
NOTE
1. Refer to Circuit Diagram (point 4).
2. Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage.
3. The allowable tolerance of the secondary voltage is within ± 5% of nominal voltage.
2. Voltage Check
- Key check point
NO
CHECK POINT
1
IC 1 PIN 5
2
IC 1 PIN 8
REMARK
5VDC
T : 20ms(50Hz)
3
IC 1 PIN 35 OR PIN 36
T : 250ns(4MHz)
- Check method
NO
MEASURE POINT
WAVE FORM
REMEDY
REMARK
1
MP1
DC 5V±0.25V
Replace VL1, EC1
NO LOAD
2
MP2
DC 12V±2.0V
Replace EC2, D11, D13, D14
NO LOAD
NOTE
Each measure point must be measured with GND points.
29
(KQG-6C4R5S)
MP1
MP2
GND
Measure Point
30
(KQG-6C5R5S)
MP1
MP2
GND
Measure Point
31
3. When there is no microwave oscillation
1) When touching START pad, oven lamp does not turn on.
Fan motor does not rotate, but cook indicator in display comes on.
B
A
RY2
42
D10
(TRAY
LAMP)
Q10
RY2
- Check method
POINT
A
B
RELAY 2 ON
5VDC
GND
RELAY 2 OFF
GND
12VDC
STATE
2) When touching START pad, oven lamp turns on.
Fan motor and turntable rotate and cook indicator in display comes on.
B
A
RY1
41
D8
(M/W)
Q9
RY1
- Check method
POINT
A
B
RELAY 1 ON
5VDC
GND
RELAY 1 OFF
GND
12VDC
A
B
RELAY 4 ON
5VDC
GND
RELAY 4 OFF
GND
12VDC
STATE
4. When there is no grillwave oscillation
- Check method
POINT
STATE
5. When the door is opened during operation, the count down timer does not stop.
A
B
R1
CN1
1
2
27
R10
C1
D.O.M SW
R9
+5V
32
C2
- Check method
POINT
A
B
1) DOOR OPEN
OPEN
5VDC
2) DOOR CLOSED
CLOSE
GND
STATE
CHECK NO
1
HETHOD
REMEDY
Check the stage(ON, OFF) of the door open monitor
switch by resistance measurement.
Replace door open monitor switch.
6. When the digital clock does not operate properly.
→ refer to Circuit Diagram.
POINT
WAVE FORM
IC 1 PIN 8
T: 20 ms(50Hz)
❈ If clock does not keep exact time, you must check resistor R20 and zener diode ZD2.
33
2. P.C.B. CIRCUIT DIAGRAM
34
✔ Caution : In this Manual, some parts can be changed for improving, their performance without notice in the parts
list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service
Information Center .
3. P.C.B. LOCATION NO.
NO
1
NAME
PCB MAIN
SYMBOL
BOARD
BZ1
PART CODE
Q'TY
REMARK
M315
SPECIFICATION
3514330700
1
KQG-6C4R5S
M319
3514330710
1
KQG-6C5R5S
BM-20K (BUJEON)
3515600100
1
2
BUZZER
3
C ARRAY
CA1
7P(6) 1000PF M 50V 2.54MM
CN6XB-102M
1
4
C CERA
C5
50V B 1000PF K (AXIAL)
CCZB1H102K
1
5
C CERA
C1~C4,C6,C7
HIKF 50V 0.1MF Z AXIAL
CCZF1H104Z
6
6
C ELECTRO
EC1
50V RS 10MF (5X11) TP
CEXE1H100A
1
7
C ELECTRO
EC2
25V RSS 1000MF(13X20) TP
CEXF1E102V
1
8
CONN WAFER
CN1
YW396-02V(YEONHO)
3519150520
1
9
CONN WAFER
CN2
HLEM15S-1
4CW215SBD0
1
10
CONN WAFER
CN3
YW396-05AV(YEONHO)
3519150510
1
11
DIODE
D1~D5,D7~D12
1N4148
DZN4148---
11
12
DIODE
D13,D14
KN4004A AUTO 52MM
DZN4004A--
2
13
DIODE ZENER
ZD1
UZ-3.3BSB(3.32-3.53V)
DZUZ3R3BSB
1
14
DIODE ZENER
ZD2
UZ-5.1BSB(4.97-5.18V)
DZUZ5R1BSB
1
15
IC MICOM
IC1
HMS87C1708B-HN018
150SR6Q4R-
1
16
IC REGULATOR
VL1
MC7805C(S/S)
1CPMC7805C
1
17
LED DISPLAY
DP1
LTC-4651HG(631)
DDDG631H02
1
18
R ARRAY
RA1
8P(7) 1/8 100K OHM J
RA-88X104J
1
19
R ARRAY
RA2
7P(6) 1/8 100K OHM J
RA-87X104J
1
20
R CARBON FILM
R23
1/6 4.7K OHM J
RD-AZ472J-
1
21
R CARBON FILM
R2~R8
1/6 330 OHM J
RD-AZ331J-
7
22
R CARBON FILM
R11
1/6 200 OHM J
RD-AZ201J-
1
AUTO 52MM
23
R CARBON FILM
R14
1/6 1M OHM J
RD-AZ105J-
1
24
R CARBON FILM
R1,10,12,17,18,22
1/6 1K OHM J
RD-AZ102J-
6
25
R CARBON FILM
R13,19,20
1/6 10K OHM J
RD-AZ103J-
3
26
R CARBON FILM
R9
1/6 100K OHM J
RD-AZ104J-
1
27
R CARBON FILM
R21
1/4 51 OHM J
RD-4Z510J-
1
28
RESONATOR CERA
CR1
CRT 4.00MS
5P4R00MTS-
1
29
SW RELAY
RY1,4
G5G-1A 1C 1P DC12V
5SC0101121
2
30
SW RELAY
RY2
CS11-12SH 1C 1P
5SC0101128
1
31
TR
Q12
KTC3198GR (1815GR)
TZTC3198GR
1
32
TR
Q6
KTA1266Y- (AUTO)(1015Y)
TZTA1266Y-
1
33
TR
Q1~Q5,Q8~Q11
KRC106M(AUTO)
TZRC106M--
9
34
TRANS POWER
LVT1
DMR-631FS
5EPV035303
1
35
WIRE COPPER
J1~J10,J13,J14
1/0.52 TIN COATING
85801052GY
12
7.5mm
36
WIRE COPPER
J11,J12
1/0.52 TIN COATING
85801052GY
2
10mm
1
PCB SUB
BOARD
M316
3514330800
1
KQG-6C4R5S
M320
3514330810
1
KQG-6C5R5S
2
CONN WAFER
CN101
HLEM15R-1
4CW215RBD0
1
3
R CARBON FILM
R101,R102
1/6 1K OHM J
RD-AZ102J-
2
4
SW ROTARY
EN101
EC12E24204A8
5S10302005
1
5
SW TACT
SW101~SW110
KPT-1115AM
5S50101Z93
10
6
WIRE COPPER
J101
1/0.52 TIN COATING
85801052GY
1
7
WIRE FLAT
WF1
15/90 WH C
WSJ-159007
1
35
10mm
EXPLODED VIEW AND PARTS LIST
1. DOOR ASSEMBLY
Refer to Disassembly and assembly.
2. CONTROL PANEL ASSEMBLY
Refer to Disassembly and assembly.
3. TOTAL ASSEMBLY
36
✔ Caution : In this Manual, some parts can be changed for improving, their performance without notice in the parts
list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service
Information Center .
NO
A00
B00
C00
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
F39
F40
F41
F42
F43
F44
F45
F46
F47
F48
F49
F50
F51
F52
PART CODE
3511725300
3511725320
PKCPSWBD50
PKCPSWF150
3512803600
3510805300
7112401011
3516111900
7122401211
7122401211
7112401011
35113A5QJ5
7112401011
4414A25110
3518606100
7121402511
3963512310
3512517000
3511800300
3518002400
3516004000
7122400811
3513003200
3518302200
3518400900
3518701100
3518119880
3516003700
3510311700
7112401011
3512100900
7272400811
3515201101
3512717600
4415A17352
4415A66910
4415A17352
3518571000
3513702610
3513811710
3513601600
7121400611
3966310100
3518905300
3513003410
7272400811
4078502031
3511405100
3517402130
3514700900
3512509210
3517203610
3517204510
7112401011
3511408200
3518905900
7121400611
PART NAME
DESCRIPTION
KOR-6Q4R5S
KOR-6Q5R5S
KQG-6C4R5S
KQG-6C5R5S
KOG-57350S
KOR-61152S
T1 TRS 4*10 MFZN
KOG-57350S
T2S TRS 4X12 MFZN
T2S TRS 4X12 MFZN
T1 TRS 4*10 MFZN
3X1.5 80X80 120-RTML
T1 TRS 4*10 MFZN
250V 15A
DWLF-M13
T2S PAN 4X25 MFZN
230V 20W MW10CA-M02
PP
PP+30%GLASS
2M218J(F) 5CF
T2 BOLT FLANGE 5X12 DACRO
T2S TRS 4*8 MFZN
SECC T0.6
2100VAC 0.98UF #187
HVR-1X-30B #187
5KV 0.55A HV-41A55-02
R1S580(EA00)
TT3 HEX 4X8 FLG MFZN
SBHG T0.6
T1 TRS 4*10 MFZN
PP DASF-130
TT3 TRS 4X8 MFZN
SCP-1 T2.5
KOG-573R0S
VP-533A-OF SPNO #187 200G
VP-531A-OF/SZM-V16-FA-61
VP-533A-OF SPNO #187 200G
MP101C
POM
POM BLACK
BL 240V 25W T25 C7A H187
T2S PAN 3X6 MFZN
220V 2.5W GM-16-24FD12
OFF:75 ON:65 H #187 NB
PP(BK)
TT3 TRS 4X8 MFZN
PP HONAM A353
MICA T0.35
XAREC
TEFLON
PP 5113MF6 A353B
BORO-SI GLASS(NEG)
MSWR3 94MM DIA:3
T1 TRS 4*10 MFZN
SBHG T0.6
OFF:75 ON:65 V #187
T2S PAN 3X6 MFZN
DOOR AS
CONTROL-PANEL AS
HEATER * T AS
CABINET AS
SCREW TAPPING
CAVITY AS
SCREW TAPPING
SCREW TAPPING
SCREW TAPPING
CORD POWER AS
SCREW TAPPING
FUSE
NOISE-FILTER
SCREW TAPPING
MOTOR SHADED POLE
GUIDE WIND
FAN
MAGNETRON
SPECIAL SCREW
SCREW TAPPING
HOLDER HV CAPACITOR
CAPACITOR HV
DIODE HV AS
FUSE HV
TRANS HV
SPECIAL SCREW
BASE
SCREW TAPPING
FOOT
SCREW TAPTITE
STOPPER HINGE *U
HARNESS MAIN
SW MICRO
SW MICRO
SW MICRO
SWITCH PUSH
LEVER LOCK
LOCK
LAMP
SCREW TAPPING
MOTOR SYNCRO
THERMOSTAT
HOLDER THERMOSTAT
SCREW TAPTITE
BUTTON LOCKING
COVER WAVE GUIDE
COUPLER
ROLLER
GUIDE ROLLER
TRAY
TRAY RACK
SCREW TAPPING
COVER INSULATOR *T
THERMOSTAT
SCREW TAPPING
37
Q'TY
1
1
1
1
1
1
3
1
1
1
2
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
4
1
5
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
1
1
1
1
1
1
1
DAEWOO ELECTRONICS CORP.
686, AHYEON-DONG MAPO-GU SEOUL, KOREA
C.P.O. BOX 8003 SEOUL, KOREA
TELEX: DWELEC K28177-8
CABLE: “DAEWOOELEC”
S/M NO. :
PRINTED DATE: Apr. 2005
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