Samsung MR1031UWC User manual

SERVICE
MICROWAVE OVEN CONTENTS
MICROWAVE OVEN
1. Precaution
2. Specifications
3. Operating Instructions
4. Disassembly and Reassembly
5. Alignment and Adjustments
6. Troubleshooting
7. Exploded Views and Parts List
8. PCB Diagrams
9. Schematic Diagrams
Manual
MR1031UWC
MR1032UBC
SEA

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)properdoorclosing,
(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
beforetheovenisreleasedtothe
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 -
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).
2. Microwave emission check should be
performed to prior to servicing if the oven is
operative.
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
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,besuretorestoreallprotective
devices, including: nonmetallic control
knobs and compartment covers.
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.
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.
CENTRAL SERVICE CENTER
10. Service technicians should remove their
watches while repairing an MWO.
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.
12. If the fuse is blown by the Interlock Monitor
Switch: Replace all of the following at the
same time: Secondary, 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.
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.
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.
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.
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.

- 2 -
H. V. Diode
Short
H. V. Capacitor
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.
NOTE : Connect the oven to a 20A. When connecting the oven to a 15A,
make sure that circuit breaker can operate.
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)
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.
Fig. 1-1 Discharging High Voltage Capacitor
Touch chassis ground first then short to the high
voltage capacitor terminal by using screwdriver or
jumper wire.
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.
PRECAUTION
Never touch any circuit wiring with your hand
nor with uninsulated tool during operation.
PRECAUTION
Servicemen should remove their watches
whenever working close to or replacing the
magnetron.

- 3 -
2. Specifications
2-1 Table of Specifications
TIMER
POWER SOURCE
POWER CONSUMPTION
OUTPUT POWER
OPERATING FREQUENCY
MAGNETRON
COOLING METHOD
OUTSIDE DIMENSIONS
NET WEIGHT
SHIPPING WEIGHT
99 MINUTES 99SECONDS
120VAC, 60Hz
MICROWAVE : 1,500W
1000W ( 10 LEVEL POWER )
2,450MHz
OM75P(31)ESS
COOLING FAN MOTOR
2011/32"(W) x 1311/32"(H) x 145/8"(D)
40.8 lbs.
36.3 lbs.

- 4 -
3. Operating Instructions
3-1 Control Panel
3-2 Features & External Views
Door Ventilation Holes Light Safety Interlock Holes
Control Panel
Open Door Push
Guide Roller
Glass Tray
Door Latches
517mm
369mm
297mm
216mm
379mm

- 5 -
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. Disconnect all lead wires from the magnetron and lamp.
2. Remove a screw securing air cover.
3. Remove the air cover.
4. Remove screws securing the magnetron to the wave guide.
5. Take out the magnetron very carefully.
6. Remove tow from the back panel of fan motor assembly.
7. Take out the fan motor assembly.
8. 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.
4-1 -1 Installation Instructions
CAUTION
. THIS OVEN WAS MANUFACTURED FOR USE IN A RECREATIONAL VEHICLE ONLY.
. THIS OVEN REQUIRES INSTALLATION INTO A CABINET STRUCTURE ONLY.
. THIS OVEN IS NOT DESIGNED FOR USE IN NON-CABINET INSTALLATIONS OR
FREESTANDING APPLICATIONS ADJACENT TO (WITHIN 2 FEET OF) ANY GAS OR ELECTRIC RANGE,COOKTOP, OR OVEN.
. PLUG THE THREE-PRONG POWER CORD INTO A PROPERLY GROUNDED OUTLET, 120V, 60Hz
OVEN INSTALLATION
. ALIGN THE SCREW HOLES ON UPPER AND LOWER TRIMS TO THE HOLES ON THE TOP ENCLOSURE AND
BOTTOM ENCLOSURE AND SECURE SCREWS. (Fig. 1)
. PLUG POWER CORD INTO RECEPTACLE, AND SLIDE OVEN INTO CABINET.
. SECURE OVEN TO CABINET THROUGH HOLES IN UPPER AND LOWER TRIMS. (Fig. 2)
. OVEN FEET MUST SIT ON CABINET FLOOR OR SUPPORT RUNNERS THAT ARE FLUSH WITH BOTTOM EDGE OF
CABINET OPENING. (Fig. 2)
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.
SCREW
(Trim to outcase)
SCREW
(Trim to outcase)
SCREW
(Trim to cabinet)
(Fig. 1) (Fig. 2)

- 6 -
4-3 Replacement of Door Assembly
4-3-1 Removal of Door "C"
Insert flat screw driver 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.
4-3-2 Removal of 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.
1. 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.
Door "E"
Door "A"
Door "C"

- 7 -
4-3-4 Reassembly Test
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 20A 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 from cavity.
2.Turntheovenupsidedowntoreplacethedrivemotor.
3. Remove a screw securing the drive motor cover
or disconnect the drive motor cover from base
plate by nipper.
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 and the coupler.
7. When replacing the drive motor, be sure to
remount it in the correct position with the coupler.
8. Connect all the leads to the drive motor.
9. Screw the drive motor cover to the base plate
with a screw driver.
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.
Drive Motor Cover Base Plate
Drive Motor

- 8 -
4-6 Replacement of Control Circuit Board
4-6-1 Removal of Control Box Assembly
1. Be sure to ground any static electric charge in
your body and never touch the control circuit.
2. Disconnect the connectors from the control
circuit board.
3. Remove screws securing the control box
assembly.
4. Remove the screw securing the ground tail of
the keyboard.
4-6-2 Removal of P.C.B Assembly
1. Pull the lever end of the plastic fastener and
remove the Flexible Printed Circuit(FPC) of
membrane panel.
2. Remove screws securing the control circuit
board.
3. Right up the control circuit board from the Ass'y
control box.
4. When reconnecting the FPC connector, make
sure that the holes on the connector are properly
engaged with the hooks on the Plastic Fastener.
4-6-3 Removal of Window Display & Membrane Panel
1. Window display should not be disassembled as
its mounting tabs will be broken. If repair work
is difficult, replace with Ass'y control panel.
2. The membrane key board is attached to the
escutcheon base with doublefaced adhesive
tape. Therefore, applying hot air such as using of
hair dryer is recommended for smoother
removal.
3. When installing new membrane key board, make
sure that the surface of escutcheon base is
cleaned sufficiently so that any problems
(shorted contacts or uneven surface) can be
avoided.
Screw
Screw
Control Box

- 9 -
5. Alignment and Adjustments
5-1 High Voltage Transformer
1. Remove connectors from the transformer terminals
and check continuity.
2. Normal resistance readings are as follows:
(Room temperature = 20° C)
5-2 Low Voltage Transformer
1.Thelowvoltagetransformerislocatedonthe
control circuit board.
2. Remove the low voltage transformer from the
PCB Ass'y and check continuity.
3. Normal resistor reading is shown in the table.
5-3 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.
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.
SHV-U1040A
Secondary
Filament
Primary
99.502%
Shows Continuity
0.3652%
Terminals
Resistance
SLV-4290U
1~2(Input)
3~4(Output7V)
5~6(Output17V)
379
10.23
31.91

- 10 -
5-4 High Voltage Capacitor
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.
5-5 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 Kin the
other direction.
5-6 Main Relay and Power Control Relay
1. The relays are located on the PCB Ass'y. Isolate them from the main circuit by disconnecting the leads.
2. Operate the microwave oven with a water load in the oven. Set the power level set to high.
3. Check continuity between terminals of the relays after the start pad is pressed.
5-7 Adjustment of Primary Switch Secondary Switch, Door Sensing Switch and Monitor Switch
1. When mounting Door Sensing switch and Interlock
Monitor switch to Latch Body, consult the figure.
2. No specific adjustment during installation of
Primary switch, Secondary switch, Door Sensing 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.
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
housingandtheswitchactuatorisnomorethan
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 Open Door Closed
Primary Interlock
Monitor switch (COM-NC)
Door Sensing switch
∞
0
∞
0
∞
0
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, Door Sensing Switch
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.
Body Latch
Door Sensing Switch
Interlock Monitor
Switch
Lever Switch
Primary Interlock
Switch

- 11 -
5-8 Output Power of Magnetron
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 44seconds 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(T2-T1) 44:HeatingTime(sec)
41 41 : Counting Time (sec)
4.187 : Coefficient for Water
1000 : Water (cc)
T : Temperature Rise (T1-T2)
To : Room Temperature
Mc : Cylindrical borosilicate glass weight
7. Normal temperature rise for this model is 9.3°C to 10.5°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.
CAUTION
MICROWAVE RADIATION
PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE
GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.

- 12 -
5-9 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.
5-10 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/cm 2.
5-11 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.
5-12 Leakage Measuring Procedure
5-12-1 Record keeping and notification after measurement
1) After adjustment and repair of a radiarion preventing device, make a repair record for the measured
values, and keep the data.
2) If the radiation leakage is more than 4 mW/cm 2after determining that all parts are in good condition,
functioning properly and the identical parts are replaced as listed in this manual notift that fact to ;
CENTRAL SERVICE CENTER
5-12-2 At least once a year have the microwave energy survey meter checked for accuracy by its
manufacturer.
Maximum allowable leakage is 5mW/cm2.
4mW/cm2is used to allow for measurement and meter accuracy

- 13 -
6. Troubleshooting
6-1 Electrical Malfunction
SYMPTOM CAUSE CORRECTIONS
Oven is dead.
Fuse is OK.
No display and no operation at all.
1. Open or loose lead wire harness
2. Open thermal cutout (Magnetron)
3. Open low voltage transformer
4. Defective Ass'y PCB
Check fan motor when thermal
cutout is defective.
Check Ass'y PCB when LVT is
defective.
No display and no operation at all.
Fuse is blown.
1. Shorted lead wire harness
2. Defective latch switch (NOTE 1)
3. Shorted HVCapacitor
4. Shorted HVTransformer (NOTE2)
Check adjustment of, latch switch,
power relay.
NOTE 1: All of these switches must be replaced at the same time.
(refer to adjustment instructions)
Check continuity of power relay contacts and if it has
continuity, replace power relay also.
NOTE 2: When HVTransformer is replaced, check diode and
magnetron also.
Oven does not accept
key input (Program)
1. Key input is not in-Sequence
2. Open or loose connection of
membrane key pad to Ass'y PCB
3. Shorted or open membrane panel
4. Defective Ass'y PCB
Refer to operation procedure.
Replace PCB main.
Timer starts countdown but no
microwave oscillation.
(No heat while oven lamp and fan
motor turn on.)
1. Off-alignment of latch switches
2. Open or loose connection of high
voltage circuit especially
magnetron filament circuit
NOTE: Large contact resistance will
bring lower magnetron
filament voltage and cause
magnetron to lower output
and/or intermittent oscillation.
3. Defective high voltage
components H.V.Transformer H.V.
Capacitor H.V.Diode, Magnetron
4. Open or loose wiring of power
relay
5. Defective Primary, Secondary latch
switch
6. Defective power relay or Ass'y PCB
Adjust door and latch switches.
Check high voltage component
according to
component test procedure and
replace if it is
defective.
Replace PCB main.
PRECAUTION
1. CHECK GROUNDING BEFORE CHECKING FOR TROUBLE.
2. BE CAREFUL OF THE HIGH VOLTAGE CIRCUIT.
3. DISCHARGE THE HIGH VOLTAGE CAPACITOR.
4. WHEN CHECKING THE CONTINUITY OF THE SWITCHES OR TRANSFORMER, DISCONNECT
ONE LEAD WIRE FROM THESE PARTS AND THEN CHECK CONTINUITY WITHOUT THE
POWER SOURCE ON. TO DO OTHERWISE MAY RESULT IN A FALSE READING OR DAMAGE
TO YOUR METER.
5. DO NOT TOUCH ANY PART OF THE CIRCUIT OR THE CONTROL CIRCUIT BOARD, SINCE
STATIC DISCHARGE MAY DAMAGE IT.
ALWAYS TOUCH GROUND WHILE WORKING ON IT TO DISCHARGE ANY STATIC CHARGE
BUILT UP.

- 14 -
6-1 Electrical Malfunction(continued)
SYMPTOM CAUSE CORRECTIONS
Oven lamp and fan motor turn on 1. Misadjustment or loose wiring
of latch switch
2. Defective latch switch
Adjust door and latch switches.
Oven can program but timer
does not start. 1. Open or loose wiring of latch
switch
2. Off-alignment of latch switch
3.
Defective latch switch
Adjust door and interlock
switches.
Microwave output is low;.
Oven takes longer time to
cook food.
1. Decrease in power source
voltage.
2. Open or loose wiring of
magnetron filament circuit.
(Intermittent oscillation))
3. Aging of magnetron
Consult electrician.
Fan motor turns on when plugged in Loose wiring of door sensing switch Check wire of door sensing
switch.
Oven does not operate and return to
the plugged in mode.
Defective Ass'y PCB Replace PCB main.
Loud buzzing noise can be heard. 1. Loose fan and fan motor
2. Loose screws on
H.V.Transformer
3. Shorted H.V.Diode
Tighten screws of fan motor.
Tighten screws of
H.V.Transformer.
Replace H.V.Diode.
Turntable motor does not rotate. 1. Open or loose wiring of
turntable motor.
2. Defective turntable motor.
Replace turntable motor.
Oven stops operation during cooking 1. Open or loose wiring of
latch switch
2. Operation of thermal
cutout(Magnetron)
Adjust door and latch switches.
Sparks 1. Metallic ware or cooking dishes
touching on the oven wall.
2. Ceramic ware trimmed with
gold or silver powder also
causes sparks.
Inform the customer.
Do not use any type of cookware
with metallic trimming.
Uneven cooking Uneven intensity of microwave due
to its characteristics.
Wrap thinner parts of the food
with aluminum foil.
Use plastic wrap or cover with a
lid.
Stir once or twice while cooking
foods such as soup, cocoa, or
milk.
Noise from the turntable motor when
it starts to operate.
Noise may result from the motor. Replace turntable motor.

- 15 -
7. Exploded Views and Parts List
7-1 Exploded Views
M001
M049
M051
M015
W002
M099
M039 M040
M038
T001
T017
M034 M047
M048
M029
M035
M036
M037
B018
B006
B004
B009
B002
M046
M019
D006
C082
C007
C006
C004
C005
C003
C009
D049
D002
D011
D007
D004
D015 D005
D003
P020
U011
U010
U009
B001
M023
M157
M022
M020
M018

- 16 -
7-2 Main Parts List
No. Code No. Description Specification Q'ty Remark
B001 3405-001034 SWITCH-MICRO 125/250VAC,16A,200GF,SPST-N 1PRI S/W
B002 3405-001033 SWITCH-MICRO 125/250VAC,16A,200GF,SPST-N 1MONITOR
B004 3405-001042 SWITCH-MICRO DC 24V,0.3A,150gf,- 1DOOR S/W
B006 DE72-00138A BODY-LATCH NC2000(0.6/0.8/1.2),PP,-,-,-, 1
B009 DE66-00088A LEVER-SWITCH NC2000(0.6/0.8/1.2),PP,-,-, 1
B018 DE96-00115A ASSY BODY LATCH MW850WA,NC2000(BUTTON) 1
M001 DE70-30001U PANEL-OUTER MR5482W,SECC,T0.6,W360,L1128 1MR1031UWC
M001 DE70-30001Y PANEL-OUTER MR1032BB,SECC,T0.6,-,-,-,BLK,- 1MR1032UBC
M015 DE39-20037J ASSY POWER CORD CM1020B,SJT AWG16-3,-,12 1
M019 3601-001198 FUSE-CARTRIDGE 250V,20A,SLOW-BLOW,CERAMI 1
M018 DE47-40025A HOLDER-FUSE KFSN-L-16,15A,NYLON#66,5G,-, 1
M020 DE96-00305A ASSY-MOTOR FAN SMF-5THUA,120V60Hz,2450,5 1
M022 DE63-00210A COVER-BLOWER 5TH-1.0,PP,T1.5,-,-,-,-,-,- 1
M023 DE31-10185B MOTOR FAN SMF-3RDUA1,120V60Hz,-,-,2300rp 1
M029 DE47-20008A THERMOSTAT PW2N-52JC,100/60,250V/7.5A,H, 1
M034 DE67-00182A COUPLER 5TH-1.0,PPS,-,-,-,- 1
M035 OM75P(31)ERHN ASSY-MAGNETRON OM75P(31)ERHN 1
M036 4713-001102 LAMP-INCANDESCENT 125V,-,25W,TRP,-,-,25x 1
M037 DE63-00208A COVER-AIR 5TH-1.0,PP,-,-,-,-,-,-,- 1
M038 DE26-00088A TRANS H.V SHV-U1040A,120V,60HZ,2220V/3.3 1
M039 2501-001016 C-OIL 950nF,2.1KV,BK,35x54x80,20mm 1
M040 DE61-50106A BRACKET-HVC -,SECC,T0.8,W31,L125.8,-,- 1
M046 DE60-60025A PIN-FOOT PP-JI350,BLK,-,-,-,-,-,- 4
M047 DE61-40065A FOOT -,PP,T2x22x17mm,BLK,-,-,- 4
M048 DE61-00557C BASE-PLATE MR1031UWC,SGCC,T0.6,-,-,-,- 1
M049 DE31-10154A MOTOR SYNCHRONOUS M2HJ49ZR02,ST-16,50/60 1
M051 DE63-00209A COVER-MGT 5TH-1.0,PP,T2.0,-,-,-,-,-,- 1
M099 DE66-90113A LEVER-DOOR PP(TB53-GH41),T2.5,-,-,12g,NT 1
M157 DE31-90057A BLADE-FAN PP,T1.5,-,3RD-W,-,-,- 1
P020 DE72-50092B DUCT-AIR -,SGCC,T0.6,W150,L212,-,- 1
T001 DE74-20015G TRAY-COOKING 3RD-1.0,T6,1115G,HKS,-,-,-, 1
T017 DE97-00222A ASSY-GUIDE ROLLER NC-1.2CUFT,SPS(C832) B 1
U009 DE64-00562A TRIM-LOWER -,SECC,-,T1.0,-,WHT,- 1MR1031UWC
U009 DE64-00562A TRIM-LOWER -,SECC,-,T1.0,-,BLK,- 1MR1032UBC
U010 DE64-00564A TRIM-UPPER -,SECC,-,T1.0,-,WHT,1.0 CU.FT 1MR1031UWC
U010 DE64-00564B TRIM-UPPER -,SECC,-,T1.0,-,BLK,1.0 CU.FT 1MR1032UBC
U011 DE70-40311A PLATE-BOTTOM MR5481G,SGCC,-,T0.6,W253,-, 1
W002 DE39-00256A WIRE HARNESS-A MW1250WA,120V60HZ,NC2000- 1

- 17 -
7-3 Control and Door Parts List
No. Code No. Description Specification Q'ty Remark
C003 RA-K2LED1-54 ASSY PCB PARTS MR1031WC/UWC,120V60HZ 1
C004 DE34-00190D SWITCH MEMBRANE MR1031UWC/XAA,ENGLISH,-, 1MR1031UWC
C004 DE34-00190F SWITCH MEMBRANE MR1032UBC/XAA,ENGLISH,-, 1MR1032UBC
C005 DE72-70202J CONTROL-PANEL MW1030WA,ABS(VE0812),-,-,- 1MR1031UWC
C005 DE72-70202J CONTROL-PANEL MW1030BA,ABS(VE0812),-,-,- 1MR1032UBC
C006 DE61-70076A SPRING-BUTTON -,HSWR,PI0.6,-,OD19,L23,5T 1
C007 DE66-20275A BUTTON-PUSH 3RD-W S1 MW5592W,-,-,-,-,9g 1MR1031UWC
C007 DE66-20275K BUTTON-PUSH JE1045GBC,ABS,-,-,BLK,SI 1MR1032UBC
C009 DE67-40179A WINDOW-DISPLAY -,SAN,T2.0,-,-,-,SMOG,- 1
C082 -ASSY CONTROL-BOX 120V60Hz,MR1031UWC/XAA, 1MR1031UWC S.N.A
C082 -ASSY CONTROL-BOX 120V60Hz,MR1031UBC/XAA, 1MR1032UBC S.N.A
D002 DE64-40317M DOOR-A MW1030WA,ABS(GENERAL),-,WHT,-,T2. 1MR1031UWC
D002 DE64-40317T DOOR-A MW1030BA,ABS(HR0370),.T2.0,-,-,-,BLK,NC-1.0 1MR1032UBC
D003 DE67-20197D SCREEN-DOOR MW1030WC,PET,T0.25,W210.4,L3 1
D004 DE94-00910A ASSY DOOR-E(COATING) MW1030WC/XAA,BLK,5T 1
D005 DE01-00118A FILM-DOOR MW5896W,-,-,L185,T0.15,W304,-, 1
D006 DE64-40012A DOOR-C -,RESIN-PP(TB53),BLACK,-,-,-,CE94 1
D007 DE61-70128A SPRING-KEY -,HSWR,PI0.6,D5,OD6,L23.5,21 1
D011 DE64-40006F DOOR-KEY POM(F20-02),-,-,12G,BLK,MW7897G 1
D015 DE94-00912A ASSY DOOR-SUB MW1030WC/XAA,-,5TH-1.0 1
D049 -ASSY DOOR MW1030WC/XAA,PURE-WHT,120V/60H 1MR1031UWC S.N.A
D049 -ASSY DOOR MW1030WC/XAA,BLK,120V/60H 1MR1032UBC S.N.A
S.N.A : SERVICE NOT AVAILABLE

- 18 -
7-4 Standard Parts List
Code No. Description Specification Q'ty Remark
DE92-90522A ASSY-SCREW PACK MR5481G,SCREW-A(6EA),-,-,-,- 1 -
DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 1P-C-EA
DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 3PN/OUT
DE60-10098A SCREW-ASSY TAP TITE -,GLD,SWRCH18A,ZPC2,PH,TC,-,M4X8,WT,- 2M/DRIV
DE60-10098A SCREW-ASSY TAP TITE -,GLD,SWRCH18A,ZPC2,PH,TC,-,M4X8,WT,- 1HVD
DE60-10195A SCREW-STAR POLE -,SWCH18A,4,12,TH,*,-,2,ZNC,- 2O/PANEL
DE60-10088A SCREW-TAP PH -,-,FEFZY,PLAIN,PH,M3,-,L8,-,- 2 -
DE60-10059A SCREW-TAP TH -,-,SUS410,CR,TH,M4,-,L8,-,- 2 C/CEILING
DE60-10070A SCREW-TAP TH -,-,FEFZY,2-SLOT,TH,M4,-,L12,-,- 3 B-PLTE
DE60-10070A SCREW-TAP TH -,-,FEFZY,2-SLOT,TH,M4,-,L12,-,- 2BD-LAT
DE60-10070A SCREW-TAP TH -,-,FEFZY,2-SLOT,TH,M4,-,L12,-,- 2CN-BOX
DE60-10070A SCREW-TAP TH -,-,FEFZY,2-SLOT,TH,M4,-,L12,-,- 1CV/AIR
DE60-10070A SCREW-TAP TH -,-,FEFZY,2-SLOT,TH,M4,-,L12,-,- 2MGT-TCO
DE60-10070A SCREW-TAP TH -,-,FEFZY,2-SLOT,TH,M4,-,L12,-,- 2MO/FAN
DE60-10070A SCREW-TAP TH -,-,FEFZY,2-SLOT,TH,M4,-,L12,-,- 1S-M-EA
DE60-10012A SCREW-TAP TITE -,SWR10,M4,L10,TH,+,-,3,ZPC2,- 1 -
DE60-10080B SCREW-WASHER -,2S,SWRCH18A,ZP2,PH,PI5,-,L10,-,- 4MGT
DE60-10080B SCREW-WASHER -,2S,SWRCH18A,ZP2,PH,PI5,-,L10,-,- 4TNS-HV