Daewoo KOR-61155 Service manual

Service Manual
Microwave Oven
KOR-61155
KOR-61151
DAEWOO ELECTRONICS CO., LTD.
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Mark 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 microwave power 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
PROPER USE AND SERVICE PRECAUTIONS
SPECIFICATIONS
FEATURE DIAGRAM
INSTALLATION
OPERATION
MEASUREMENT OF THE MICROWAVE OUTPUT POWER
MICROWAVE RADIATION TEST
KOR-6115 WIRING DIAGRAM
KOR-61151 WIRING DIAGRAM
CIRCUIT DESCRIPTION
PRECAUTIONS FOR DISASSEMBLY AND REPAIR
DISASSEMBLY AND ASSEMBLY
INTERLOCK MECHANISM
TROUBLE SHOOTING GUIDE
COMPONENT TEST PROCEDURE
EXPLODED VIEW AND PARTS LIST
3
4
5
6
7
8
9
10
11
12
14
15
20
22
24
26
2
PROPER USE AND SERVICE PRECAUTIONS
CAUTION : THIS DEVICE IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL.
CONSULT THE SERVICE MANUAL FOR PROPER SERVICE PROCEDURES TO ASSURE
CONTINUED SAFETY OPERATION AND FOR PRECAUTIONS TO BE TAKEN TO AVOID
POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY.
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 even 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 have excessive emission level 5mW/cm2, the service person should:
(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 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.
CAUTION
MICROWAVE RADIATION
PERSONNEL SHOULD NOT BE EXPOSED TO THE MICROWAVE ENERGY WHICH MAY RADIATE FROM
THE MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT IS IMPROPERLY USED OR
CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS. WAVEGUIDES, FLANGES AND
GASKETS MUST BE SECURE. NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY
ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA WHILE THE
DEVICE IS ENERGIZED
3
SPECIFICATIONS
ITEM
SPECIFICATION
POWER SUPPLY
MICROWAVE
120V~60Hz, SINGLE PHASE WITH EARTHING
POWER CONSUMPTION
920 W
OUTPUT POWER
600 W (IEC 705) (FULL MICROWAVE POWER)
FREQUENCY
2450 MHz
OUTPUT DIMENSIONS (W X H X D)
465 X 274 X 360 mm (18.3 X 10.8 X 14.2 in.)
CAVITY DIMENSIONS (W X H X D)
290 X 200 X 290 mm (11.4 X 7.9 X 11.4 in)
NET WEIGHT
APPROX. 12.5 kg (27.6 Ibs.)
TIMER
35 min. DUAL SPEED
POWER SELECTIONS
5 LEVELS
CAVITY VOLUME
0.64 Cu.Ft.
* Specifications are subject to change without notice.
360
274
465
4
FEATURES DIAGRAM
2
4
1
9
12
11
8
3
5
6
7
¤ Safety Interlock System
¤Ł Door Viewing Screen - Allows viewing of food. The screen is designed so that light can pass through, but not the
microwave.
¤Ø 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.
¤Œ Oven Cavity
¤º Door Seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage.
¤ Glass Cooking Tray - Made of special heat resistant glass. Food in a proper receptacle is placed on this tray for
cooking.
¤ Roller Guide - This must always be used for cooking together with the glass cooking tray.
¤ Coupler - This fits over the shaft in the center of the oven’s cavity floor. This is to remain in the oven for all
cooking.
¤ Knob V.P.C - Used to select a microwave power level.
¤ Knob Timer - Used in setting cooking time for all functions.
¤æ Door Release Button - By pushing this button the latch system cut off all circuits and stops the oven before the
door is opened.
5
INSTALLATION
1 Steady, flat location
2 Leave space behind and side
This microwave oven should be set on a steady, flat surface.
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 or antenna,
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 15 amperes, 120 Volts, 60Hz grounded outlet.
• Power supply cord is about 1.0 meters long.
1. A short power-supply cord is poovided to reduce the risks resulting from becoming entangled in or tripping over a
longer cord.
2. Longer cord sets or extension cords are available and may be used if care is exercised in their use.
3. If a long cord or extension cord is used, (1) the marked electrical rating of the cord set or extension cord should be at
least as great as the electrical rating of the appliance, (2) the extension cord must be a grounding-type 3-wire cord,
and (3) the longer cord should be arranged so that will not drape over the countertop or tabletop where it can be
pulled on by children or tripped over unintentionally.
When use a grounding adaptor, make
usre the receptacle box is fully
grounded
When use 3-pronged plug
3-prong Receptacle
Receptacle Box cover
Grounding Lead
Receptacle
Box cover
3-prong plug
Grounding Adaptor
Receptacle
6 Examine the oven after unpacking for any damage such as:
A misaligned door, Broken door, A dents in cavity.
If any of the above are visible, DO NOT INSTALL, and notify dealer immediately.
6
OPERATION
1
Connect the main lead to an electrical outlet.
2
After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray must
always be in place during cooking.
3
Close the door securely.
4
Choose cooking power by setting V.P.C. Knob to the desired position.
Refer to cookbook for recommended power levels.
5
Determine cooking time. Consult cookbook for recipe timing.
¢” Oven light turns on and cooling fan starts to operate. Microwave cooking starts.
6
You may open the door while the oven is operating.
As soon as the door is opened, the safety mechanisms stop microwave power and cooking timer.
if you wish to change the time during cooking, simply
adjust the Timer to the desired time.
7
When the timer reaches zero, a bell will ring and the
unit will turns off.
¢” Oven light turns off.
If additional cooking time is needed and the door has
not been opened, the oven will automatically start
when the Timer is reset.
NOTE :
1. When setting Timer for less than 2 minutes, turn
the Timer past 2 minutes and then return to the
correct timer setting.
0
1
2
3
35
30
4
25
5
20
6
15
10
2. Various clicking noises may be heard when turning
the V.P.C. knob. This is normal and does not affect
the operation of your microwave oven.
Variable Power Cooking
ON and OFF cycle time of mechanicial V.P.C. switch is 30 seconds.
When the V.P.C. knob is set to the desired position and timer knob turns to the desired position, the V.P.C. switch
has a cycle (ON/OFF time (sec)) listed below.
Variable power setting
ON/OFF time (sec)
Power
30/0
100%
(MED HIGH)
23.2/6.8
77%
(MEDIUM)
16.5/13.5
55%
(DEFROST)
9.8/20.2
33%
5/25
17%
(HIGH)
(WARM)
7
MEASUREMENT OF THE MICROWAVE OUTPUT POWER
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 1,000¡ 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.
Water Load
5. Heating time should be exactly 49 seconds.
Heating time is measured while the microwave generator is operating at full power.
The filament heat-up time for magnetrons is not
included.
6. The initial and final water temperatures are selected so
that the maximum difference between the ambient and
final water temperatures is 5K.
Tray
7. The microwave power output P in watts is calculated from the following formula:
P = 4187 X ∆T/t
• ∆T is actual temperature rise.
• t is the heating time.
The power measured should be 600W¡ 10.0%.
CAUTION :
1. Water load should be measured exactly to 1 liters.
2 Input power voltage should be exactly 230V as specified.
3. Ambient temperature should be 20¡ 2˚C(68 ¡ 3.6˚F)
8
MICROWAVE RADIATION TEST
WARNING
• Make sure to check the microwave leakage before and after repair of adjustment.
• Always, start measuring of an unknown field to assure safety for operating personnel from microwave energy.
• Do not place your hands into any suspected microwave radiation field unless the safe density level is known.
• Care should be taken not to place the eyes in direct line with the source of microwave energy.
• Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the
test.
PROCEDURE
A) Prepare Microwave Energy Survey Meter, 600cc glass beaker, glass thermometer 100˚C or 212˚F.
B) Pour 275cc ¡ 15cc of tap water initially at 20 ¡ 5˚C(68 ¡ 9˚F) in the 600cc beaker with an inside diameter of approx.
9.5cm (3.5 in).
C) Place it at the center of the tray and set it in a cavity.
D) Close the door and operate the oven.
E) Measure the leakage by using microwave energy survery meter with dual ranges, set to 2450 MHz.
ƒ¡ Measured radiation leakage must not exceed the values prescribed below.
• Leakage for a fully assembled oven with door normally closed must be less than 4mW/cm2.
ƒ¡When measuring the leakage, always use the 2 in (5cm) 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 seam, door viewing screen, the
exhaust air vents and the suction air vents.
ƒ¡Measuring should be in a counter-clockwise direction at a rate of 1 inch/sec. If the leakage of the
cabinet door seam is unknow, move the probe more
slowly.
ƒ¡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 inches from any metal.
If it does, erroneous reading may result.
9
POWER SUPPLY :
SINGLE PHASE~ONLY
10
RD
1
M
GY : GRAY
GE : GREEN/YELLOW
BK : BLACK
GN : GREEN
BR : BROWN
BL : BLUE
OR : ORANGE
BL
TM
SECONDARY
INTERLOCK SWITCH
BK
INTERLOCK
MONITOR
SWITCH
BK
WH
TIMER
SWITCH
GY
2
3
GY
WH
GY
GM : GEARED MOTOR
FM : FAN(BLOWER) MOTOR
GY
V.P.C. : VARIABLE POWER CONTROLLER
TM : TIMER MOTOR
RD
GY
V.P.C. : HIGH
TIMER : ON
DOOR : CLOSED
[ CONDITION ]
CL GM FM
GY
CL : CAVITY LAMP
V.P.C.
TIMER ASS'Y
WH : WHITE
NOTE : RD : RED
WH
NEUTRAL
GN
LIVE
RD
FUSE
PRIMARY
INTERLOCK
SWITCH(UPPER)
HIGH VOLTAGE
TRANSFORMER
OR
H.V. DIODE
H.V.
CAPACITOR
MAGNETRON
OR
KOR-6115 WIRING DIAGRAM
GN
N
N
GN
L
L
FUSE
FILTER ASS’Y
POWER SUPPLY :
SINGLE PHASE~ONLY
11
RD
WH
1
M
GY : GRAY
GE : GREEN/YELLOW
BK : BLACK
GN : GREEN
BR : BROWN
BL : BLUE
OR : ORANGE
BL
TM
TIMER
SWITCH
GY
2
3
GY
WH
GY
GM : GEARED MOTOR
FM : FAN(BLOWER) MOTOR
GY
V.P.C. : VARIABLE POWER CONTROLLER
TM : TIMER MOTOR
RD
GY
V.P.C. : HIGH
TIMER : ON
DOOR : CLOSED
[ CONDITION ]
CL GM FM
GY
CL : CAVITY LAMP
V.P.C.
TIMER ASS'Y
SECONDARY
INTERLOCK SWITCH
BK
INTERLOCK
MONITOR
SWITCH
BK
PRIMARY
INTERLOCK
SWITCH(UPPER)
WH : WHITE
NOTE : RD : RED
WH
RD
CAVITY
THERMOSTAT
HIGH VOLTAGE
TRANSFORMER
OR
H.V. DIODE
H.V.
CAPACITOR
MAGNETRON
OR
KOR-61151 WIRING DIAGRAM
CIRCUIT DESCRIPTION
1. When the food is placed in the oven cavity and door is closed.
• The contact of the interlock monitor switch open.
• The contacts of the primary interlock switch and secondary interlock switch close.
Primary
Interlock
Switch
15A Fuse
Timer
Switch
Interlock
Monitor
Switch
TM
CL
GM FM
Secondary
Interlock
Switch
TM
Timer motor
CL
GM
Cavity lamp
Geard motor
FM
Fan motor
Fig. 1
2. When the timer is set to the time desired.
• The contact of the timer switch close.
• Oven lamp turn on.
• 120V AC is applied to the high voltage transformer.
• Turntable motor start rotating and glass tray rotating.
• Fan motor rotating and cools the magnetron by blowing air.
• Timer motor operating and point to passing cooking time.
• 3.3 Volts AC is generated from the filament winding of the high voltage transformer. This filament voltage is applied to
the magnetron to heat the magnetron filament through two noise preventing choke coils.
• A high voltage of 2000 Volts AC is generated in the secondary of high voltage transformer and this secondary voltage
is increased by the action of the diode and the charging of the high voltage capacitor. This resultant D.C voltage is then
applied to the anode of the magnetron. As shown in Fig. 2 the first half cycle of the high voltage produces in the high
voltage transformer secondary charges the high voltage capacitor. Current flow is in the direction of the dotted-line
during the second half cycle, the voltage produced by the transformer secondary, and the charge of the high voltage
capacitor are combined and applied to the magnetron as shown by the solid line so that oscillations begins.
The disturbance wave generated by the magnetron is prevented by the choke coils of 1.5µH, filter capacitors of 500pF
and the magnetron’s shielded case so that TV and radio programs are not impaired by noise.
12
HIGH VOLTAGE
TRANSFORMER
H.V.
CAPACITOR
MAGNETRON
H.V.
FUSE
H.V. DIODE
Fig. 2
3. When the door is opened during cooking.
• Primary interlock switch and secondary interlock switch open to cut off the primary voltage to the high voltage
transformer to stop microwave oscillation.
• Fan motor, timer motor and turntable motor stop rotating.
• Oven lamp turn off.
• As soon as the door is opened, monitor switch close (NC) to create the short circuit.
If the contacts of primary interlock switch and secondary interlock switch are both malfunction, the 15A fuse blows open
due to the large current surge caused by monitor switch activation.
13
PRECAUTIONS FOR DISASSEMBLY AND REPAIR
ƒ¡Cautions to be observed when trouble shooting.
Unlike many other appliances, the microwave oven is a 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 golves 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 make sure it is earthed
properly before beginning repair work.
2. Warning about the electric charge in the high voltage capacitor.
For about 30 seconds after the operation 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 screw
driver to discharge.
(4) When the 15A fuse is blown out due to the operation of the monitor switch; replace primary, secondary interlock switch
and monitor switch.
Refer to next page for the necessary adjustment.
(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 remove their watches whenever working close to or repairing the magnetron.
WARNING : 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-H.V. Transformer, Magnetron, H.V.
Capacitor, H.V. Diode.
14
DISASSEMBLY AND ASSEMBLY
1. To remove cabinet
Remove three screws on cabinet back.
2. To remove door assembly
(1) Remove two screws ¤ which secure the stopper
hinge top.
1
(2) Remove the door assembly ¤Ø from top plate of
cavity.
3
(3) Remove the above for reassembly.
2
NOTE : After replacing the door perform a
check of correct alignment with the
hinge and cavity front face.
3. To remove door parts
1
2
3
4
5
6
7
8
15
(1) Remove the gasket door ¤ from door plate ¤Œ.
(2) Remove the barrier screen inner ¤ºfrom door plate ¤Œ.
(3) Remove the door frame ¤Łfrom door plate ¤Œ.
(4) Remove the stopper hinge top ¤Øfrom door plate ¤Œ.
(5) Remove the spring ¤ and the hook ¤ .
(6) Remove the barrier screen outer ¤ from door frame ¤Ł.
(7) Remove the above steps for reassembly.
4. Method to reduce the gap between the door seal and the oven front surface.
(1) To reduce gap located on part ‘A’.
1) Loosen two screws on stopper hinge top, and
then push the door to contact the door seal to
oven front surface.
2) Tighten two screws.
A
D
(2) To reduce gap located on part ‘B’.
1) Loosen three screws on bottom hinge, and then
the door to contact the door seal to oven front
surface.
2) Tighten three screws.
B
C
(3) To reduce gap located on part ‘C’. (See Fig. A)
1) Loosen a screw on the interlock switch assembly located at the bottom of the oven body.
2) Draw the interlock switch assembly inward as possible to engage with hook on the door bottom.
3) Tighten a screw.
(4) To reduce gab located on part ‘D’.(See Fig. B)
1) Loosen a screw on the interlock switch assembly located at the top of the oven body.
2) Follow step (3) 2) and 3).
Secondary
Interlock
Switch
Mounting
Screw
Hook
Hook
Mounting Screw
Primary
Interlock
Switch
Fig. A
Fig. B
NOTE : A small gab may be acceptable if the microwave leakage does not exceed 4mW/cm2.
16
5. To remove control panel parts
(1) Remove the screw which secure the control panel,
push up two snap fits and draw forward the control
panel assembly.
5
2
Control Panel
6
7
3
8
4
1
9
10
(2) Remove the door open lever ¤ from the control panel.
(3) Remove two screws ¤Łwhich secure the timer assembly ¤Ø.
(4) Remove the timer assembly ¤Ø.
(5) Pull out the timer knob ¤Œ from the timer assembly ¤Ø.
(6) Pull out the timer coupler ¤ºfrom the timer assembly ¤Ø.
(7) Remove the screw ¤ which secure the V.P.C. coupler ¤ .
(8) Pull out the V.P.C coupler ¤ and V.P.C knob ¤ from the control panel.
(9) Remove the door open button ¤ and button spring ¤ from the control panel.
(10) Reverse the above steps for reassembly.
17
6. To remove high voltage capacitor
(1) Remove a screw ¤ which secure the grounding
ring ring terminal of the H.V. diode ¤Łand the
capacitor holder ¤Ø.
1
3
(2) Remove the H.V. diode ¤Łfrom the capacitor ¤Ø.
(4) Reverse the above steps for reassembly.
2
High voltage circuit wiring
Magnetron
H.V. Capacitor
H.V. Diode
H.V. Transformer
7. To remove magnetron
(1) Remove four screws ¤
magnetron ¤Ł.
which secure the
(2) Remove the magnetron ¤Ł.
(3) Reverse the above steps for reassembly.
18
CAUTION : 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.
Magnetron
Antenna
Metallic
Gasket
Plate
Wave Guide
Magnetron Antenna
Cooling Fin
Metallic Gasket Plate
Magnetron
Filament
Terminal
8. To remove fan motor assembly
(1) Remove two screws ¤ which secure the back cover ¤Ł from the cavity outer.
(2) Remove two screws ¤Øwhich secure the fan motor ¤Œ from the back cover ¤Ł .
(3) Pull out the fan ¤º from the fan motor ¤Œ .
(4) Reverse the above steps for reassembly.
1
3
5
1
2
4
9. To remove transformer
(1) Remove the two screws ¤ holding the H.V. transformer ¤Ł .
(2) Remove the transformer ¤Ł.
(3) Reverse the above steps for reassembly.
19
INTERLOCK MECHANISM
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 micro switch. Then the button of the primary interlock switch
bring it under on condition.
Latch
Mounting Screw
Button
Hook
Primary Interlock Switch
Adjustment 1
1.2mm
When the door is closed, the switch button is pushed by
the hook.
The movement of the switch button should exceed 1.2mm
measured at the top of the button.
20
(2) Secondary interlock switch and interlock monitor switch
When the door is closed, the hook pushes the push lever downward, the push lever presses the button of the interlock
monitor switch to bring it under “OFF”, condition and presses the button of the secondary interlock switch to bring it
under “ON”, condition.
Interlock
Monitor
Swtich
Secondary
Interlock
Switch
Hook
Push Lever
Adjustment 2
• Interlock monitor switch
When the door is closed, the interlock monitor switch should be opened before other switches close.
When the door is opened, the interlock monitor switch should be closed after other switches open.
• Secondary interlock switch
The movement of the switch button should exceed 1.2mm measured at the top of the button.
(3) Adjustment steps
a)
b)
c)
d)
e)
Loosen the two mounting screws.
Adjust interlock switch assembly position.
Confirm the gap (1.2mm) described above.
Make sure that push lever moves smoothly after adjustments is completed.
Completely tighten the two mounting screws.
NOTE : Microwave emission test should be performed after adjusting interlock machanism. If the microwave
emission exceed 4mW/cm2, readjust interlock mechanism.
(4) Interlock switch replacement
Whenever safety interlock switch are replaced:
1) Refer to the following diagram.
2) Check the connection of monitor switch after replacement.
3) Perform the electrical continuity check of interlock switches and microwave emission test mentioned in this manual.
Secondary
Interlock
Switch
Interlock
Monitor
Switch
Primary
Interlock
Switch
RD
WH
WH
BL
WH
BK
RD
RD
RD
WH
21
SYMBOL
COLOR
RD
RED
WH
WHITE
BK
BLACK
BL
BLUE
TROUBLE SHOOTING GUIDE
TROUBLE
DOOR SHUT, TIMER SET BUT NO COOKING TAKES PLACE.
1.
Does the fan motor work when you shut the door
and turn the timer?
NO
Does 15A fuse
blow?
NO
continuity
YES
Check continuity of interlock monitor switch with
door shuted.
continuity
*All these switches must be
replace at the same time.
Replace
fuse.
Both
continuity
Replace
primary interlock switch,
secondary interlock switch
and interlock monitor switch.
Check continuity of both interlock
switch’s contact and monitor
switch’s contact with door partially open until monitor switch contact closes.
Both no
continuity
One is continuity
the other is not
Disconnect one side of the lead
wire connected from transformer
to the high voltage capacitor, and
operate oven.
Replace
primary, secondary interlock
switch and interlock monitor
switch.
Replace
primary, secondary interlock
switch and interlock monitor
switch.
Replace
high voltage
capacitor.
Normal
Replace
high voltage
transformer.
Fuse again blows
Outlet has
Proper voltage.
Check continuity of
power supply cord.
22
NO
continuity
Replace
Power supply cord.
2.
Does the fan motor when you shut the door and turn the time?
YES
NO
Does the oven lamp light?
Does the turntable turn?
YES
Check continuity
of filament of
magnetron.
No microwave
oscillation.
Check continuity
of filament of
magnetron.
NO
continuity
NO
continuity
*Do not operate when you check this continuity
NO
Check continuity filcontinuity
ament tap (3.3V) of high
voltage transformer.
Replace or repair
oven lamp,
turntable motor.
Replace
magnetron.
Replace
high voltage
transformer.
*Normal reading should be approx. 0 Ω
Check the diode for
cintinuity in the reverse
and normal direction
Continuity
in the
reverse
direction
Replace
high voltage
diode.
*Meter with 6V or higher voltage batteries should
be used to check the normal direction resistance
of the diode.
Poor
continuity
Replace high voltage
transformer.
NO GOOD
Check the isolation of
filament winding of high
voltage transformer.
GOOD
Replace
magnetron.
Faulty magnetron
23
COMPONENT TEST PROCEDURE
1. High voltage is present at the high voltage terminal of the voltage transformer during any cooking cycle.
2. It is neither necessary nor advisable to attempt measurement of the high voltage.
3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the
capacitor (see page 13).
1. High voltage transformer
4. Magnetron
(A) Remove connections from the transformer terminals
and check continuity.
(B) Normal readings should be as follows:
Secondary winding
Approx. 150Ω ¡ 10%
Filament winding
Approx. 0Ω
Primary winding
Approx. 0Ω
For complete magnetron diagnosis, refer to “Measurement of the Microwave Output Power”. (Page 8)
Continuity checks can only indicate and open filament
or a shorted magnetron.
To diagnose for an open filament or shorted magnetron,
(A) Isolate magnetron from the circuit by disconnecting
the leads.
(B) A continuity check across magnetron filament terminals should indicate 0.1ohm or less.
(C) A continuity check between each filament terminal
and magnetron case should read open.
2. High voltage capacitor
(A) Check continuity of capacitor with meter on the
highest OHM scale.
(B) A normal capacitor will show continuity for a short
time, and then indicate 9MΩ once the capacitor is
charged.
(C) A shorted capacitor will show continuous continuity.
(D) An open capacitor will show constant 9MΩ.
(E) Resistance between each terminal and chassis should
be infinite.
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.
3. High voltage diode
(A) Isolate the diode from the circuit by disconnecting the
leads.
(B) 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 frontback resistance of the diode, otherwise an infinite
resistance may be read in both directions. A normal
didoes resistance will be infinite in one direction and
several hundred KΩ in the other direction.
CAUTION : REPLACE BLOWN FUSE WITH 15
AMPERE FUSE.
24
6. Interlock switches
• You can test continuity of safety interlocks and monitor switch by using switch tester or ohmmeter.
• The switch operation is checked by zero/unlimited.
the meter should indicate zero resistance.
• The sequence of check is interlock monitor switch; primary and secondary interlock switched check.
1) In case of interlock monitor switch check
POWER
SUPPLY
CORD
Condition
1) Door is opened.
2) Common terminal of the monitor switch disconnected.
PRIMARY
INTERLOCK SWITCH
INTERLOCK
MONITOR
SWITCH
OHHMETER
2) In case of primary interlock switch check.
Condition
1) Door is closed.
POWER
SUPPLY
CORD
PRIMARY
INTERLOCK SWITCH
INTERLOCK
MONITOR
SWITCH
OHHMETER
25
EXPLODED VIEW AND PARTS LIST
1. Door Assembly
A01
A02
A03
A04
A05 A06
A07
A08
NO
PART NAME
PARTS CODE
Q’TY
A01
BARRIER-SCREEN *O
3517003000
1
A02
FRAME DOOR
3512202500
1
A03
STOPPER HINGE *T
3515201000
1
A04
DOOR WELD AS
3511705500
1
A05
BARRIER-SCREEN *I
3517002800
1
A06
GASKET DOOR
3512300200
1
A07
HOOK
3513100700
1
A08
SPRING HOOK
3515101300
1
26
2. Control Panel Ass’y
NO
PART NAME
PARTS CODE
Q’TY
B01
KNOB VPC
3513402600
1
B02
CONTROL PANEL
3512202000
1
B03
COUPLER VPC KNOB
3517400500
1
B04
SCREW TAPPINGT2S PAN 4X12 PW
7621401211
1
B05
KNOB
3513402500
1
B06
COUPLER TIMER
3517400400
1
B07
TIMER
3518203800
1
B08
SCREW TAPPING T2S PAN 4X12 PW
7621401211
2
B09
LEVER DOOR OPEN
3513701400
1
B10
SPRING DOOR BUTTON
441B655072
1
B11
BUTTON DOOR OPEN
3516903600
1
27
KOR-6115 Parts List
REE NO.
A00
B00
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
F
F39
F40
PART CODE
3511706010
3516713100
3510801300
7S312X40A1
3516104800
7S341W40B1
7S341W40B1
4413A90012
7S422X4081
35113NBND5
3518002200
7S312X40A1
7S312X40A1
7S101W4081
3511402500
3963820110
3511800300
7S422X4081
3513001900
441L267010
4416V24000
3518106600
7S427W40A1
3512100900
3510308700
7S422X4081
7S312X40A1
3515201100
5S762S10G0
5S762M10G0
5S762S10G0
3513701300
3513805700
3513601500
7121400811
3966820200
3511403200
3517400600
3514700900
3512509200
3512510600
3517203600
7S427W40A1
PART NAME
DOOR AS
CONTROL-PANEL AS
CABINET
SCREW SPECIAL
CAVITY AS
SCREW SPECIAL
SCREW SPECIAL
CLAMP POWER CORD
SEREW SPECIAL
CORD POWER AS
MAGNETRON
SCREW SPECIAL
SCREW SPECIAL
SCREW MACHINE
COVER *B
MOTOR SHADED POLE
FAN
SCREW SPECIAL
HOLDER HV CAPACITOR
CAPACITOR HV
DIODE HV
TRANS HV
SCREW SPECIAL
FOOT
BASE
SCREW SPECIAL
SCREW SPECIAL
STOPPER HINGE *U
SW MICRO
SW MICRO
SW MICRO
LEVER LOCK
LOCK
LAMP
SCREW TAPPING
MOTOR SYNCRO
COVER WAVE GUIDE
COUPLER
ROLLER
GUIDE ROLLER
GUIDE ROLLER AS
TRAY
SCREW SPECIAL
DESCRIPTION
KOR-61150S
KOR-61150A
PCM T0.6
T1 TRS 4X10 SE MFZN
KOR-61150S
T2S PAN 4X12 PW SE MFZN
T2S PAN 4X12 PW SE MFZN
NYLON 66
TT2 TRS 4X8 SE MFZN
3X1.45 60X60 200-RTML
2M218H (MF) I
T1 TRS 4X10 SE MFZN
T1 TRS 4X10 SE MFZN
PAN FLANGE 4X8 MFZN
SBHG T0.8
120V 17W MW10XA-R01
PP+30% GLASS
TT2 TRS 4X8 SE MFZN
SECC T0.8
2100VAC 0.7UF
SANKEN HVR-1X-32B (D5.3)
JMOT-N60A0-61T
TT2 HEX FG 4X10 SE MFZN
PP DASF-130
SBHG T0.8
TT2 TRS 4X8 SE MFZN
T1 TRS 4X10 SE MEZN
SCP-1 T2.5
V16-FA-63 SPNO #187 200G
V16-FA-62 SPNC #187 200G
V16-FA-63 SPNO #187 200G
POM
POM BLACK
BL 125V 25W T25 C5A H187
T2S PAN 4X8 MFZN
120V 2W GM-16-12F17
HEATPROOF PP
PPS
TEFLON
PP
KOR-61150S
GLASS
TT2 HEX FG 4X10 SE MFZN
29
Q’TY
1
1
1
3
1
2
1
1
1
1
1
3
2
2
1
1
1
1
1
1
1
1
4
2
1
2
6
1
1
1
1
1
1
1
2
1
1
1
3
1
1
1
2
REMARKS
KOR-61151 Parts List
REE NO.
A00
B00
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
F
F42
F43
PART CODE
3511706010
3516713100
3510801300
7S312X40A1
3516104820
7S341W40B1
7S341W40B1
4413A90012
7S422X4081
35113YAR95
3518902400
7121300811
3518002200
7S312X40A1
7S312X40A1
7S101W4081
3511402510
3963820110
3511800300
7S422X4081
3513001900
441L267010
4416V24000
3518106600
7S427W40A1
3512100900
3510308700
7S422X4081
7S312X40A1
3515201100
5S762S10G0
5S762M10G0
5S762S10G0
3513701300
3513805700
3513601500
3518603700
7121400811
3966820200
3511403200
3517400600
3514700900
3512509200
3512510600
3517203600
7S427W40A1
PART NAME
DOOR AS
CONTROL-PANEL AS
CABINET
SCREW SPECIAL
CAVITY AS
SCREW SPECIAL
SCREW SPECIAL
CLAMP POWER CORD
SEREW SPECIAL
CORD POWER AS
THERMOSTAT
SCREW TAPPING
MAGNETRON
SCREW SPECIAL
SCREW SPECIAL
SCREW MACHINE
COVER *B
MOTOR SHADED POLE
FAN
SCREW SPECIAL
HOLDER HV CAPACITOR
CAPACITOR HV
DIODE HV
TRANS HV
SCREW SPECIAL
FOOT
BASE
SCREW SPECIAL
SCREW SPECIAL
STOPPER HINGE *U
SW MICRO
SW MICRO
SM MICRO
LEVER LOCK
LOCK
LAMP
NOISE-FILTER
SCREW TAPPING
MOTOR SYNCRO
COVER WAVE GUIDE
COUPLER
ROLLER
GUIDE ROLLER
GUIDE ROLLER AS
TRAY
SCREW SPECIAL
DESCRIPTION
Q’TY
KOR-61150S
1
KOR-61150A
1
PCM TO.6
1
T1 TRS 4X10 SE MFZN
3
KOR-61151A CSA
1
T2S PAN 4X12 PW SE MFZN
2
T2S PAN 4X12 PW SE MFZN
1
NYLON 66
1
TT2 TRS 4X8 SE MFZN
1
3X1.45 60X60 120-RTML
1
OFF:80 ON:50 V PW-2N #187
1
T2S PAN 3X8 MFZN
1
2M218H(MF) I
1
T1 TRS 4X10 SE MFZN
3
T1 TRS 4X10 SE MFZN
2
PAN FLANGE 4X8 MFZN
2
SBHG T0.8
1
120V 17W MW10XA-R01
1
PP+30% GLASS
1
TT2 TRS 4X8 SE MFZN
1
SECC TO.8
1
2100VAC 0.7UF
1
SANKEN HVR-1X-32B (D5.3)
1
JMOT-N60A0-61T
1
TT2 HEX FG 4X10 SE MFZN
4
PP DASF-130
2
SBHG T0.8
1
TT2 TRS 4X8 SE MFZN
2
T1 TRS 4X10 SE MEZN
6
SCP-1 T2.5
1
V16-FA-63 SPNO #187 200G
1
V16-FA-62 SPNC #187 200G
1
V16-FA-63 SPNO #187 200G
1
POM
1
POM BLACK
1
BL 125V 25W T25 C5A H187
1
DWLF-M
1
T2S PAN 4X8 MFZN
2
120V 2W GM-16-12F17
1
HEATPROOF PP
1
PPS
1
TEFLON
3
PP
1
KOR-61150S
1
GLASS
1
TT2 HEX FG 4X10 SE MFZN
2
31
REMARKS
DAEWOO ELECTRONICS CO., LTD.
686, AHYEON-DONG, MAPO-GU,
SEOUL, KOREA
C.P.O. BOX 8003 SEOUL, KOREA
TELEX: DWELEC K28177-8
CABLE: “DAEWOOELEC”
FAX: 02) 364-5588/5305
TEL: 02) 360-7114/7315~7
PRINTED DATE: MAR., 1996