MICROWAVE OVEN
M171FN (WHITE)
SERVICE
MICROWAVE OVEN
Manual
CONTENTS
1. Precaution
2. Specifications
3. Operating Instructions
4. Disassembly and Reassembly
5. Alignment and Adjustments
6. Troubleshooting
7. Exploded Views and Parts List
8. Schematic Diagrams
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 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.
1. Precaution
Follow these special safety precautions. Although the microwave oven is completely safe during ordinary use,
repair work can be extremely hazardous due to possible exposure to microwave radiation, as well as potentially
lethal high voltages and currents.
1-1 Safety precautions (
)
1. All repairs should be done in accordance
with the procedures described in this
manual. This product complies with
Federal Performance Standard 21 CFR
Subchapter J(DHHS).
11. To avoid any possible radiation hazard,
replace parts in accordance with the wiring
diagram. Also, use only the exact
replacements for the following parts:
Primary and secondary interlock switches,
interlock monitor switch.
2. Microwave emission check should be
performed to prior to servicing if the oven is
operative.
12. If the fuse is blown by the Interlock Monitor
Switch: Replace all of the following at the
same time: Primary, door sensing switch
and power relay, as well as the Interlock
Monitor Switch. The correct adjustment of
these switches is described elsewhere in this
manual. Make sure that the fuse has the
correct rating for the particular model being
repaired.
3. If the oven operates with the door open :
Instruct the user not to operate the oven and
contact the manufacturer and the center for
devices and radiological health immediately.
4. Notify the Central Service Center if the
microwave leakage exceeds 5 mW/cm2.
13. Design Alteration Warning:
Use exact replacement parts only, i.e.,
only those that are specified in the
drawings and parts lists of this manual.
This is especially important for the
Interlock switches, described above.
Never alter or add to the mechanical or
electrical design of the MWO. Any design
changes or additions will void the
manufacturer's warranty. Always unplug
the unit's AC power cord from the AC
power source before attempting to
remove or reinstall any component or
assembly.
5. Check all grounds.
6. Do not power the MWO from a "2-prong"
AC cord. Be sure that all of the built-in
protective devices are replaced. Restore any
missing protective shields.
7. When reinstalling the chassis and its
assemblies, be sure to restore all protective
devices, including: nonmetallic control
knobs and compartment covers.
14. Never defeat any of the B+ voltage
interlocks. Do not apply AC power to the
unit (or any of its assemblies) unless all
solid-state heat sinks are correctly installed.
8. Make sure that there are no cabinet openings
through which people --particularly
children --might insert objects and contact
dangerous voltages. Examples: Lamp hole,
ventilation slots.
15. Some semiconductor ("solid state") devices
are easily damaged by static electricity. Such
components are called Electrostatically
Sensitive Devices (ESDs). Examples include
integrated circuits and field-effect
transistors.
Immediately before handling any
semiconductor components or assemblies,
drain the electrostatic charge from your
body by touching a known earth ground.
9. Inform the manufacturer of any oven found
to have emission in excess of 5 mW/cm2 ,
Make repairs to bring the unit into
compliance at no cost to owner and try to
determine cause.
Instruct owner not to use oven until it has
been brought into compliance.
16. Always connect a test instrument's ground
lead to the instrument chassis ground before
connecting the positive lead; always remove
the instrument's ground lead last.
CENTRAL SERVICE CENTER
10. Service technicians should remove their
watches while repairing an MWO.
- 1 -
1-2 Special Servicing Precautions (Continued)
17. When checking the continuity of the witches
or transformer, always make sure that the
power is OFF, and one of the lead wires is
disconnected.
18. Components that are critical for safety are
indicated in the circuit diagram by
shading,
or .
19. Use replacement components that have the
same ratings, especially for flame resistance
and dielectric strength specifications. A
replacement part that does not have the
same safety characteristics as the original
might create shock, fire or other hazards.
1-3 Special High Voltage Precautions
1. High Voltage Warning
Do not attempt to measure any of the high
voltages --this includes the filament voltage
of the magnetron. High voltage is present
during any cook cycle.
Before touching any components or wiring,
always unplug the oven and discharge the
high voltage capacitor (See Figure 1-1)
H. V. Capacitor
2. The high-voltage capacitor remains charged
about 30 seconds after disconnection. Short
the negative terminal of the high-voltage
capacitor to to the oven chassis. (Use a
screwdriver.)
3. High voltage is maintained within specified
limits by close-tolerance, safety-related
components and adjustments. If the high
voltage exceeds the specified limits, check
each of the special components.
H. V. Diode
Short
Touch chassis ground first then short to the high
voltage capacitor terminal by using screwdriver or
jumper wire.
Fig. 1-1 Discharging High Voltage Capacitor
PRECAUTION
PRECAUTION
Never touch any circuit wiring with your hand
nor with uninsulated tool during operation.
There exists HIGH VOLTAGE ELECTRICITY
with high current capabilities in the circuits of the
HIGH VOLTAGE TRANSFORMER secondary
and filament terminals. It is extremely dangerous
to work on or near these circuits with the oven
energized.
DO NOT measure the voltage in the high voltage
circuit including filament voltage of magnetron.
PRECAUTION
Servicemen should remove their watches
whenever working close to or replacing the
magnetron.
- 2 -
2. Specifications
2-1 Table of Specifications
TIMER
35 MINUTES
POWER SOURCE
230V 50Hz, SINGLE PHASE
POWER CONSUMPTION
1,150W
OUTPUT POWER
100W / 800W (ICE-705)
OPERATING FREQUENCY
2,450MHz
COOLING METHOD
COOLING FAN MOTOR
MAGNETRON
OM75S(31)ESS
OUTSIDE DIMENSIONS(mm)
489(W) x 275(H) x 397(D)
OVEN DIMENSIONS(mm)
306(W) x 211(H) x 320(D)
SHIPPING DIMENSIONS(mm)
557(W) x 329(H) x 466(D)
SHIPPING WEIGHT APPROX.
NET
13.5kg
GROSS
15.0kg
- 3 -
3. Operating Instructions
3-1 Control Panel
DEFROST
VARIABLE COOKING
POWER CONTROL KNOB
INSTANT REHEAT
TIMER KNOB
3-2 Features & External Views
DOOR LATCHES
VENTILATION HOLS
LIGHT
VARIABLE COOKING
POWER CONTROL KNOB
TIMER KNOB
HANDLE
ROLLER RING
TURNTATBLE
SAFETY
INTERLOCK HOLES
COUPLER
275mm
DOOR
342mm
206mm
489mm
397mm
- 4 -
4. Disassembly and Reassembly
4-1 Replacement of Magnetron, Motor Assembly and Lamp
Remove the magnetron including the shield case, permanent magnet, choke coils and capacitors (all of
which are contained in one assembly).
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect all lead wires from the magnetron and lamp.
Remove a screw securing air cover.
Remove the air cover.
Remove screws securing the magnetron to the wave guide.
Take out the magnetron very carefully.
Remove nuts from the back panel.
Take out the fan motor.
Remove the oven lamp by rotating to pull out from hole of air cover.
NOTE1: When removing the magnetron, make sure that its antenna does not hit any adjacent
parts, or it may be damaged.
NOTE2: When replacing the magnetron, be sure to remount the magnetron gasket in the correct
position and make sure the gasket is in good condition.
4-2 Replacement of High Voltage Transformer
1. Discharge the high voltage capacitor.
2. Disconnect all the leads.
3. Remove the mounting bolts.
4. Reconnect the leads correctly and firmly.
PRECAUTION
Servicemen should remove their watches whenever
working close to or replacing the magnetron.
PRECAUTION
There exists HIGH VOLTAGE ELECTRICITY with high current capabilities in the circuits of the HIGH
VOLTAGE TRANSFORMER secondary and filament terminals. It is extremely dangerous to work on or near
these circuits with the oven energized.
DO NOT measure the voltage in the high voltage circuit including filament voltage of magnetron.
- 5 -
4-3 Replacement of Door Assembly
4-3-1 Removal of Door "C"
Insert flat screwdriver into the gap between Door
"A" and Door "C" to remove Door "C". Be careful
when handling Door "C" because it is fragile.
Then remove the door assembly.
Door "A"
Door "C"
90
4-3-2 Removal of Door "E"
Door "E"
Following the procedure as shown in the figure,
insert and bend a thin metal plate between Door
"E" and Door "A" until you hear the 'tick' sound.
- Insertion depth of the thin metal plate should be
0.5mm or less.
4-3-3 Removal of Key Door & Spring
Remove pin hinge from Door "E"
Detach spring from Door "E" and key door.
- 6 -
4-3-4 Reassembly Test
After replacement of the defective component parts of the door, reassemble it and follow the instructions
below for proper installation and adjustment so as to prevent an excessive microwave leakage.
1. When mounting the door to the oven, be sure to adjust the door parallel to the bottom line of the oven
face plate by moving the upper hinge and lower hinge in the direction necessary for proper alignment.
2. Adjust so that the door has no play between the inner door surface and oven front surface. If the door
assembly is not mounted properly, microwave energy may leak from the space between the door and oven.
3. Do the microwave leakage test.
4-4 Replacement of Fuse
1. Disconnect the oven from the power source.
2. When 12A fuse blows out by the operation of interlock monitor switch failure, replace the primary interlock
switch, door sensing switch, monitor switch and power relay.
3. When the above three switches operate properly, check if any other part such as the control circuit board,
blower motor or high voltage transformer is defective.
4-5 Replacement of Drive Motor
1. Take out the glass tray, guide roller and coupler
from cavity.
2. Turn the oven upside down to replace the drive motor.
3. Remove a screw securing the drive motor cover.
4. Disconnect all the lead wires from the drive motor.
5. Remove screws securing the drive motor to the cavity.
6. Remove the drive motor.
7. When replacing the drive motor, be sure to
remount it in the correct position.
8. Connect all the leads to the drive motor.
9. Screw the drive motor cover to the base plate
with a screw driver.
10. Remount the coupler in the correct position.
Drive Motor
Drive Motor Cover
- 7 -
Base Plate
4-6 Replacement of Control Circuit Board
4-6-1 Removal of Control Box Assembly
1. Disconnect the connectors from the control
box assembly.
2. Remove screws securing the control box
assembly.
3. Remove the knobs of the control box A'ssy.
4. Remove the screw securing the timer.
CONTROL-BOX
- 8 -
SCREW
5. Alignment and Adjustments
PRECAUTION
1. High voltage is present at the high voltage terminals during any cook 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 high voltage capacitor.
5-1 High Voltage Transformer
1. Remove connectors from the transformer terminals
and check continuity.
2. Normal resistance readings are as follows:
Secondary
Filament
Primary
Approx. 151.5Ω
Approx. 0Ω
Approx. 2.5Ω
(Room temperature = 20° C)
5-2 Magnetron
1. Continuity checks can indicate only an open
filament or a shorted magnetron. To diagnose an
open filament or shorted magnetron.
2. Isolate the magnetron from the circuit by
disconnecting its leads.
3. A continuity check across the magnetron filament
terminals should indicate one ohm or less.
4. A continuity check between each filament terminal
and magnetron case should read open.
- 9 -
5-3 High Voltage Capacitor
Ω
1. Check continuity of the capacitor with the meter set at the highest resistance scale.
2. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates 9M .
3. A shorted capacitor will show continuous continuity.
4. An open capacitor will show constant 9M .
5. Resistance between each terminal and chassis should read infinite.
Ω
5-4 High Voltage Diode
1. Isolate the diode from the circuit by disconnecting its leads.
2. With the ohm-meter set at the highest resistance scale, measure across the diode terminals. Reverse the
meter leads and read the resistance. A meter with 6V, 9V or higher voltage batteries should be used to
check the front-to back resistance of the diode (otherwise an infinite resistance may be read in both
directions). The resistance of a normal diode will be infinite in one direction and several hundred KΩ in the
other direction.
5-5 Adjustment of Primary Switch, Door Sensing Switch and Monitor Switch
Precaution
For continued protection against radiation hazard, replace parts in accordance with the wiring diagram and be sure to
use the correct part number for the following switches: Primary and secondary interlock switches, and the interlock
monitor switch (replace all together). Then follow the adjustment procedures below. After repair and adjustment, be
sure to check the continuity of all interlock switches and the interlock monitor switch.
1. When mounting Primary switch and Interlock
Monitor switch to Latch Body, consult the figure.
2. No specific adjustment during installation of
Primary switch and Monitor switch to the latch
body is necessary.
3. When mounting the Latch Body to the oven
assembly, adjust the Latch Body by moving it so
that the oven door will not have any play in it.
Check for play in the door by pulling the door
assembly. Make sure that the latch keys move
smoothly after adjustment is completed.
Completely tighten the screws holding the Latch
Body to the oven assembly.
Primary Interlock Switch
Interlock
Monitor
Switch
Body Latch
Lever Door(A)
Lever Door(B)
4. Reconnect to Monitor switch and check the
continuity of the monitor circuit and all latch
switches again by following the components test
procedures.
5. Confirm that the gap between the switch
housing and the switch actuator is no more than
0.5mm when door is closed.
6. Interlock Switch Replacement - When
replacing faulty switches, be sure switch mounting
tabs are not bent, broken or otherwise deficient in
their ability to secure the switches in place.
Door Sensing
Switch
Door Open
Door Closed
Primary switch
Monitor switch(COM-NC)
∞
0
0
∞
∞
∞
Monitor switch(COM-NO)
Door Sensing S/W
- 10 -
0
0
5-6 Output Power of Magnetron
CAUTION
MICROWAVE RADIATION
PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE
GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.
The output power of the magnetron can be measured by performing a water temperature rise test.
Equipment needed :
* Two 1-liter cylindrical borosilicate glass vessel (Outside diameter 190 mm)
* One glass thermometer with mercury column
NOTE: Check line voltage under load. Low voltage will lower the magnetron output. Make all temperature
and time tests with accurate equipment.
1. Fill the one liter glass vessel with water.
2. Stir water in glass vessel with thermometer, and record glass vessel's temperature ("T1", 10±1°C).
3. After moving the water into another glass vessel, place it in the center of the cooking tray. Set the oven to
high power and operate for 55seconds exactly. (3 seconds included as a holding time of magnetron
oscillation:)
4. When heating is finished, stir the water again with the thermometer and measure the temperature ("T2").
5. Subtract T1 from T2. This will give you the water temperature rise. ( T)
6. The output power is obtained by the following formula;
△
Output Power =
4.187 x 1000 x
△T+0.55xMcx(T -T )
2
0
52
55 : Heating Time (sec)
52 : Counting Time (sec)
4.187 : Coefficient for Water
1000 : Water (cc)
T : Temperature Rise (T2-T1)
To : Room Temperature
Mc : Cylindrical borosilicate glass weight
△
7. Normal temperature rise for this model is 9° C to 11° C at 'HIGH'.
NOTE 1: Variations or errors in the test procedure will cause a variance in the temperature rise.
Additional power test should be made if temperature rise is marginal.
NOTE 2: Output power in watts is computed by multiplying the temperature rise (step 5) by a factor of 91
times the of centigrade temperature.
5-7 Microwave Heat Distribution - Heat Evenness
The microwave heat distribution can be checked indirectly by measuring the water temperature rise at
certain positions in the oven:
1. Prepare five beakers made of 'Pyrex', having 100 milliliters capacity each.
2. Measure exactly 100milliliters off water load with a measuring cylinder, and pour into each beaker.
3. Measure the temperature of each water load. (Readings shall be taken to the first place of decimals.)
4. Put each beaker in place on the cooking tray as illustrated in figure below. Start heating.
5. After heating for 2 minutes, measure the water temperature in each beaker.
6. Microwave heat distribution rate can be calculated as follows:
Heat Distribution =
Minimum
Temperature Rise
Maximum
Temperature Rise
D
X 100(%)
Beake
D
D/4
D/4
D/4
The result should exceed 65%.
D/4
- 11 -
Cooking Tray
5-8 Procedure for Measurement of Microwave Energy Leakage
1) Pour 275±15cc of 20±5° C(68±9° F) water in a beaker
which is graduated to 600cc, and place the beaker in
the center of the oven.
2) Start to operate the oven and measure the leakage by
using a microwave energy survey meter.
3) Set survey meter with dual ranges to 2,450MHz.
4) When measuring the leakage, always use the 2 inch
spacer cone with the probe. Hold the probe
perpendicular to the cabinet door. Place the spacer
cone of the probe on the door and/or cabinet door
seam and move along the seam, the door viewing
window and the exhaust openings moving the
probe in a clockwise direction at a rate of 1 inch/sec. If the leakage testing of the cabinet door seam is
taken near a corner of the door, keep the probe perpendicular to the areas making sure that the probe end
at the base of the cone does not get closer than 5cm to any metal. If it gets closer than 5cm, erroneous
readings may result.
5) Measured leakage must be less than 4mW/cm2, after repair or adjustment.
Maximum allowable leakage is 5mW/cm2.
4mW/cm2 is used to allow for measurement and meter accuracy
5-9 Check for Microwave Leakage
1. Remove the outer panel.
2. Pour 275±15cc of 20±5° C(68±9° F) water in a beaker
which is graduated to 600cc, and place the beaker in
the center of the oven.
3. Start the oven at the highest power level.
4. Set survey meter dual ranges to 2,450MHz.
5. Using the survey meter and spacer cone as described
above, measure near the opening of magnetron, the
surface of the air guide and the surface of the wave
guide as shown in the following photo.( but avoid the
high voltage components.) The reading should be less than 4mW/cm2 .
5-10 Note on Measurement
1) Do not exceed the limited scale.
2) The test probe must be held on the grip of the handle, otherwise a false reading may result when the
operator's hand is between the handle and the probe.
3) When high leakage is suspected, do not move the probe horizontally along the oven surface; this may
cause damage to the probe.
4) Follow the recommendation of the manufacturer of the microwave energy survey meter.
5-11 Leakage Measuring Procedure
5-11-1 Record keeping and notification after measurement
1) After adjustment and repair of a radiation preventing device, make a repair record for the measured
values, and keep the data.
2) If the radiation leakage is more than 4mW/cm2 after determining that all parts are in good condition,
functioning properly and the identical parts are replaced as listed in this manual notify that fact to ;
CENTRAL SERVICE CENTER
5-11-2 At least once a year have the microwave energy survey meter checked for accuracy by its
manufacturer.
- 12 -
6. Troubleshooting
WARNING FOR HIGH VOLTAGE
4000 VOLTS EXIST AT THE HIGH VOLTAGE AREA. DO NOT OPERATE THE OVEN WITH
CABINET PARTS REMOVED. DO NOT REMOVE THE CABINET PARTS IF THE POWER SUPPLY
CORD IS PLUGGED IN THE WALL OUTLET. UNPLUG THE POWER CORD BEFORE SERVICING.
6-1 Electrical Malfunction
Parts
Fuse blows
out when
door is
opened.
Fuse is
Open
Oven lamp
does not
light.
Fan does
not operate.
Cause
Diagnosis
Remedy
Defective primary
interlock switch
are winding.
Check continuity of the primary switch terminals
with wire removed using a multimeter. If there is
continuity inter between switch terminals when door
is opened,the switch is defective.
Replace the primary
interlock switch
Defective interlock
monitor switch
Check continuity of the monitor switch terminals
with wire removed by using a multimeter.
If there is continuity between switch terminals the
door is closed, the switch is defective.
Replace the interlock
monitor switch
Layer short of the
secondary coil of
H. V. Transformer
The fuse will not blow right away, but if it blows in
a few seconds, then there is a layer short If the
fuse blows with H. V. Trans secondary open, the
transformer may be faulty.
Replace H. V.Transformer
1) Fuse blown out
Check fuse.
Replace the fuse.
2) Poor contact of
power cord.
Check continuity of power supply cord. Also
check whether the power cord is securely wired.
Adjust or replace
the power supply cord
3) Defective lamp
The fan motor rotates, but lamp does not light.
Replace the lamp.
4) Defective timer
contacts
Check the terminals of timer for continuity,turning
the timer knob ON and OFF repeatedly.
Replace the timer.
5) Thermal cutout
S/W open
In this case the oven lamp and fan do not turn on
Replace the thermal
cutout S/W
1) Defective fan
motor.
If 230V is found at motor terminals, the motor
should be replaced.
Replace the motor.
2) Defective contacts of timer
The oven lamp does not light and fan motor does
not operate.
Replace the timer.
NOTE: Interlock monitor switch must be replaced when the fuse is blown out.
- 13 -
6-1 Electrical Malfunction(continued)
part
Cause
1) Too small
a load
Diagnosis
Remedy
If a small amount of food is heated for a long time,
period of microwave may turn off during operation.
Microwave
turns off during
cooking cycle.
To increase the oven
water into water into
the oven.
2)Defective
magnetron
Check to see if the magnetron thermal cutout switch
Replace thermal cutout
thermal
is activated at a temperature higher than 150 .
switch.
℃
cutout S/W
properly
shock is
felt.
Door doe not
Incomplete
Make sure that qrounding of the power supply cord
grounding
has been done properly.
1) Broken door
Remove the cabinet for inspection. Check the door
hinges
hinge.
Rewire.
Replace door hinges.
operate
properly
2) Missing or
loose screw
1) Defective
Timer does
not operate.
timer motor
Check if the screws are secured well to the door
hinge.
If the timer does not operate with 21V applied to
the terminals, the timer motor amy be faulty.
Fasten or tighten.
Replace timer.
2) Defective
contacts of
The lamp does not light.
Replace timer
timer S/W
1) Defective
Cooking tray
drive motor
Check to see if 21V exists at the motor terminals.If
so, motor will be defective.
does not
rotate.
1) Blocking of
the ventilatior
Magnetron
thermal
cutout
switch
OFF
2) Defective fan
motor
3) Too small a
Check if the air inlet or outlet ventilation is blocked
by the wall or other objects.
If the fan motor does not operate with 230V applied
to the terminal, the motor may be faulty.
Replace drive motor.
Keep a distance of
100mm from the wall
or the objects.
Replace fan motor.
If a small amount of food is heated repeatedly over
To increase the oven
load or no
a long period of time, microwave turns off during
load, place a glass of
load
operation.
water into the oven.
- 14 -
6-2 Unsatisfactory Cooking
Parts
Cause
1) Open cathode of
magnetron
Diagnosis
Remedy
Check the terminals with a multimeter to see
Replace magnetron.
if the heater circuit is open.
Check the H. V. Diode for continuity in the reverse and
2) Defective
H. V. Diode
normal directions using meter. If there is continuity
in the reverse direction, the H. V. Diode may be faulty.
Replace H. V. Diode.
(In this event H. V. Capacitor will be hot)
Connect megger leads to quick-connect terminal &
3) Shorted
magnetron
body of the magnetron if there is continuity, the
magnetron may be fuse will be blown) faulty. (In this
Replace magnetron.
case the main fuse will be blown)
Food is
4) Defective
magnetron
not heated.
5) Poor contact of
primary interlock
switch
6) Open coil of
If there is a crack in the magnetron antenna (dome),
the magnetron is defective.
Check if the screws are secured well to the door hinge.
and pressing it ON and OFF repeatedly.
Check the continuity of primary coil and secondary
H. V. Trans-
coil. If there is no continuity, H. V. Transformer is
former
defective.
7) Shorted H. V.
capacitor
8) Monitor fuse
blown out
Replace magnetron.
Replace or adjust.
Replace the
H. V. Transformer.
Check the continuity of capacitor.
Replace the
If the capacitor shorts, the fuse blows
H. V. Capacitor.
Replace the
Check the monitor fuse (on the noise filter)
Monitor fuse
6-3 Part Check List
Symptom
Related Parts
Check Points
Remedy
1) Check if the primary and secondary coil is open or shorted.
Ω Approx
* Resistance of primary coil: . 2.5
H.V.Transformer
Ω
Resistance of secondary coil: Approx. 151.5
Replace.
2) Check if the MGT Heater Voltage is approx. 3.3V AC.
Microwave
Caution : High voltage !
cooking does
not work.
Check continuity of capacitor between two
H.V.Capacitor
terminals with H.V.wire lead removed.
Replace.
The resistance should be approx. 10MΩ, it's failure..
H.V.Diode
1) If there is no continuity in forward, direction the H.V.Diode is open.
2) If there is continuity in reverse direction, it's shorted.
Replace.
Fan motor
does not
Fan motor
Check if the motor coil is open.
rotate.
- 15 -
Replace.
7. Exploded Views and Parts List
7-1 Exploded Views
D006
D005
D004
D003
M001
W002
D002
M029
M015
D015
D007
D011
M019
M014
D049
M017
M020
D019
M022
M023
C032
M051
M157
C024
C005
B006
C092
M049
M036
B001
B018
B002
M035
M048
B010
M038
M037
B011
C082
M039
M040
MM127
T001
T017
M132
M034
- 16 -
M043
M042
7-2 Main Parts List
No.
Code No.
B001
3405-001034
SWITCH-MICRO
Description
125/250VAC,16A,200GF,SPST-N
Specification
Q'ty
2
B002
3405-001032
SWITCH-MICRO
125/250VAC,16A,200GF,SPDT
1
B006
DE72-00137A
LATCH-BODY
NC2000(0.6/0.8/1.2),PP,-,-,-,
1
B010
DE66-00093A
LEVER-SWITCH(A)
NC2000,PP-TH53,-,-,-,-,N
1
B011
DE66-00094A
LEVER-SWITCH(B)
NC2000,PP-TH53,-,-,-,-,N
1
B018
DE96-00120B
ASSY BODY LATCH
M1717N,NC2000(HANDLE)
1
M001
DE70-00184P
PANEL-OUTER
MW850WA,C/STEEL,T0.5,-,-,-,P
1
M014
3601-001126
FUSE-CARTRIDGE
250V,1.6A,FAST-ACTING,CER
1
M015
DE39-00224A
ASSY POWER CORD
M308,-,KDK-4819D,250V6A,
1
M017
DE96-00008D
ASSY NOISE FILTER
SN-3WEB(12),250V12A,EU
1
M019
3601-001019
FUSE-CARTRIDGE
250V,12A,SLOW-BLOW,CERAMI
1
M020
DE96-00031A
ASSY-MOTOR FAN
SMF-3RDEA,230V50HZ,2400RP
1
M022
DE71-00148A
COVER-BLOWER
MW850WA,PP,T1.5,-,-,-,NTR,N
1
M023
DE31-10184A
MOTOR FAN
SMF-3RDEA,230V50Hz,2400rpm,3rd
1
M029
DE47-20008A
THERMOSTAT
PW2N-52JC,100/60,250V/7.5A,H,
1
M034
DE67-00140A
COUPLER
NC2000(0.6~0.8),PPS(ESS840),-,3G
1
M035
OM75S(31)ERH
ASSY-MAGNETRON
OM75S(31)ERH
1
M036
4713-001046
LAMP-INCANDESCENT
240V,104mA,25W,ORG,-,-
1
M037
DE71-60457B
COVER-AIR
3RD-0.7(BTM),PP,-,-,-,-,-,-
1
M038
DE26-00079A
TRANS H.V
SHV-EURO1,230V,50HZ,2130V/3.6V
1
M039
2501-001016
C-OIL
950nF,2.1KV,BK,35x54x80,20mm
1
M040
DE61-00139A
BRACKET-HVC
NC2000,SECC,T0.8,-,-,-,0.6/0
1
M042
DE59-00002A
DIODE-H.V
ESJC13-12B,12KV,-,-,-,MWO ALL,
1
M043
DE91-70061J
ASSY-H.V.FUSE
THV060T-0650-H,5KV0.65A,WL
1
M048
DE80-00023A
BASE-PLATE
MW850WA,SGCC1,T0.6,-,-,NC2000
1
M049
DE31-10154A
MOTOR SYNCHRONOUS
M2HJ49ZR02,ST-16,50/60
1
M051
DE71-00151A
COVER-MGT
MW850WA,PP,T2,W54,L129,-,GE-WH
1
M132
DE61-40066A
FOOT
-,PP,-,BLK,-,-,-
2
M157
DE31-90057A
BLADE-FAN
PP,T1.5,-,3RD-W,-,-,-
1
T001
DE74-00027A
TRAY-COOKING
NC2000,GLASS,NEG,T5,255MM,-
1
T017
DE97-00193B
ASSY-GUIDE ROLLER
NC2000 0.6,T2*P1198(14
1
W002
DE39-00041C
WIRE HARNESS-A
M1713N,-,-,-,-,-,-,-,-,-,
1
- 17 -
Remark
7-3 Control & Door Parts List
No.
Code No.
C005
DE64-00906A
CONTROL-PANEL
Description
M171FN/XEF,ABS,PURE-WHT,SE
Specification
1
C024
DE45-10074H
TIMER
TMFK35MTM1,-,21V,-,50Hz,-,-,STL BK
1
C032
3501-000309
RELAY-POWER
240V,3750VA,15000MA,-,6MS,20
1
C082
DE94-00883A
ASSY CONTROL-BOX
230V50HZ,M171FN/XEF,PUR
1
C092
DE64-00649B
KNOB-TIMER(D)
M171FN/G271FN,ABS,PURE-WHT
2
D002
DE64-00644B
DOOR-A
M171FN/G271FN,ABS,PURE-WHT(W9501)
1
D003
DE64-00646B
SCREEN-DOOR
M171FN/G271FN,SAN,SMOG,-,-,-
1
D004
DE92-50133C
ASSY DOOR-E
MW4593G,-,BLK,3RD-0.7
1
D005
DE01-00112A
FILM-DOOR
-,PET,-,L268,T0.15,W150,NTR,-
1
D006
DE64-40008B
DOOR-C
-,PP,CE745G,-,-,-,BLK,-
1
D007
DE61-00198A
SPRING-KEY
M1877,HSWR,PI0.7,-,D6,23 1/4,
1
D011
DE64-00264A
KEY-DOOR
3RD-W NEW,POM,-,BLK,-,-,-
1
D015
DE94-00124B
ASSY DOOR-SUB
MW4593G,BLK,3RD-0.7,-,-,-,
1
D019
DE64-00645B
HANDLE-DOOR
M171FN/G271FN,ABS,PURE-WHT(W
1
D049
DE94-00763B
ASSY DOOR
M171FN/G271FN,PURE-WHT,TDS+SAM
1
S.N.A : SERVICE NOT AVAILABLE
- 18 -
Q'ty
Remark
S.N.A
S.N.A
7-4 Standard Parts List
Code No.
Description
Specification
Q'ty
Remark
DE60-10012A
SCREW-TAP TITE
-,SWR10,M4,L10,TH,+,-,3,ZPC2,-
1
N/P EARTH
DE60-10012A
SCREW-TAP TITE
-,SWR10,M4,L10,TH,+,-,3,ZPC2,-
1
P/C EARTH
DE60-10012A
SCREW-TAP TITE
-,SWR10,M4,L10,TH,+,-,3,ZPC2,-
1
PCB EARTH
DE60-10012A
SCREW-TAP TITE
-,SWR10,M4,L10,TH,+,-,3,ZPC2,-
1
TCO-S/W
DE60-10063A
SCREW-TAP TH
-,-,FEFN,-,TH,M4,-,L12,-,-
1
O/PANEL
DE60-10080B
SCREW-WASHER
-,2S,SWRCH18A,ZP2,PH,PI5,-,L10,-,-
4
HVT
DE60-10080B
SCREW-WASHER
-,2S,SWRCH18A,ZP2,PH,PI5,-,L10,-,-
4
MGT
DE60-10082H
SCREW-A
-,-,-,-,2S-4X12,TOOTHED,-,-,-,-
1
AIR/COVER
DE60-10082H
SCREW-A
-,-,-,-,2S-4X12,TOOTHED,-,-,-,-
2
B/LATCH
DE60-10082H
SCREW-A
-,-,-,-,2S-4X12,TOOTHED,-,-,-,-
3
B/PLATE
DE60-10082H
SCREW-A
-,-,-,-,2S-4X12,TOOTHED,-,-,-,-
1
C/BLOWER
DE60-10082H
SCREW-A
-,-,-,-,2S-4X12,TOOTHED,-,-,-,-
1
C/BOX
DE60-10082H
SCREW-A
-,-,-,-,2S-4X12,TOOTHED,-,-,-,-
4
O/PANEL
DE60-10098A
SCREW-ASSY TAP TITE
-,GLD,SWRCH18A,ZPC2,PH,TC,-,M4X8,WT,-
1
D/MOTOR
DE60-30016A
NUT-FLANGE
M4,MSWR10,-,-,-,-,-,-,-
2
F-MOTOR
DE60-10069A
SCREW-TAP TH
-,-,FRFZY,-,TH,M4,-,L10,-,-
2
HANDLE
DE60-10069A
SCREW-TAP TH
-,-,FRFZY,-,TH,M4,-,L10,-,-
1
RELAY
DE60-10069A
SCREW-TAP TH
-,-,FRFZY,-,TH,M4,-,L10,-,-
4
TIMER
DE72-00152A
CONTROL-PANEL(D)
M1717,ABS,-,-,-,-,P/WHT,0.7CU.FT
1
DE60-10012A
SCREW-TAP TITE
-,SWR10,M4,L10,TH,+,-,3,ZPC2,-
1
B/COVER
DE60-10098A
SCREW-ASSY TAP TITE
-,GLD,SWRCH18A,ZPC2,PH,TC,-,M4X8,WT,-
1
HVD
- 19 -
8. Schematic Diagrams
8-1 Schematic Diagrams
(This Document can not be used without Samsung's authorization)
MAGNETRON
HIGH VOLTAGE
DIODE
TO CHASSIS
FA
F
HIGH VOLTAGE CAPACITOR
RED
RED
RED
H.V.FUSE
BRN
RED
BLU
HIGH VOLTAGE
TRANSFORMER
- 20 -
SYMBOL
BRN
BLK
RED
BLU
ORG
COLOR
BROWN
BLACK
RED
BLUE
ORANGE
ELECTRONICS
This Service Manual is a property of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law.
© Samsung Electronics Co., Ltd. May 2003
Printed in Korea
Code No. : DE68-03150A