Samsung MW5286N User manual

MICROWAVE OVEN
MW5286N
SERVICE
Manual
MICROWAVE OVEN 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. PCB Diagrams
9. Schematic Diagrams

Samsung Electronics
(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.
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING
SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE
MICROWAVE ENERGY

1. Precaution
1-1 Safety precautions ( )
Samsung Electronics 1-1
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 immediatly.
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, be sure to restore all protective
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 emmission 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: 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.
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.10.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.
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.

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. High Voltage Warning
Do not attempt to measureany 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.
1-2
Pretaution
Samsung Electronics
1-2 Special Servicing Precautions (Continued)
1-3 Special High Voltage Precautions
Fig. 1-1. Discharging the High Voltage Capacitor
PRECAUTION
Servicemen should remove their watches whenever
working close to or replacing the magnetron.
PRECAUTION
Never touch any circuit wiring with your hand nor with
uninsulated tool during operation.
H. V. Diode
Short
H. V. 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.

2. Specifications
2-1 Table of Specifications
Samsung Electronics 2-1
TIMER 99 MINUTES 90 SECONDS
POWER SOURCE 120V 60Hz, AC
POWER CONSUMPTION MICROWAVE : 1,300W
OUTPUT POWER FROM 90 TO 900W (10 LEVEL POWER)
(IEC-705 TEST PROCEDURE)
OPERATING FREQUENCY 2,450MHz
MAGNETRON OM75PH(31)
COOLING METHOD COOLING FAN MOTOR
OUTSIDE DIMENSIONS 517(W) x 297(H) x 395(D)
POWER LEVEL
%MW5286N
10% 90W 4 sec 26 sec
20% 180W 7 sec 23 sec
30% 270W 10 sec 20 sec
40% 360W 13 sec 17 sec
50% 450W 16 sec 14 sec
60% 540W 19 sec 11 sec
70% 630W 22 sec 8 sec
80% 720W 25 sec 5 sec
90% 810W 28 sec 2 sec
100% 900W 30 sec 0 sec
ON TIME OFF TIME

3-1 Samsung Electronics
Auto Reheat Programs
Auto Cook Programs
Power Level Button
Auto Defrost Programs
Time Setting
and Weight Selection
Cancel Button
Deodorization Button
Start Button
10Sec.
1Min.
10 Min.
Hours
Servings
Minutes
1.Popcorn
2.Potato
3.Fresh Vegetable
1.
Plate of Food
2.
Soup/Sauce
3.Casserole
Cancel
Clock
Power Level
Auto Reheat
Auto Cook
1 Min. +
Start
Defrost
3. Operating Instructions
3-1 Control Panel
3-2 Features & External Views
Door Ventilation Holes Light Safety Interlock Holes
Control Panel
Display
Roller Ring
Coupler
Glass Plate
Door Latches
517mm
297mm
395mm

4. Disassembly and Reassembly
4-1 Replacement of Magnetron, Motor Assembly and Lamp
Samsung Electronics 4-1
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 the magnetron
supporter.
3. Remove the magnetron supporter.
4. Remove the air cover.
5. Remove screws securing the magnetron to the
wave guide.
6. Take out the magnetron very carefully.
7. Remove screws from the back panel.
8. Take out the fan motor.
9. 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.
1. Discharge the high voltage capacitor.
2. Disconnect all the leads.
3. Remove the mounting bolts.
4. Reconnect the leads correctly and firmly.
4-2 Replacement of High Voltage Transformer
Lamp
Magnetron
H. V. Trans
H. V. Capacitor
Screw
Thermo S/WCover Air
Fan Motor
PRECAUTION
Servicemen should remov 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.

4-3 Replacement of Door Assembly
4-3-1 Removal of Door Assembly
4-2 Samsung Electronics
Remove hex bolts securing the upper hinge and
lower hinge. Then remove the door assembly.
Insert flat screwdriver into the gap between Door
"E" and Door "C" to remove Door "C". Be careful
when handling Door "C" because it is fragile.
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.
Remove pin hinge from Door "E"
Detach spring from Door "E" and key door.
4-3-2 Removal of Door "C"
4-3-3 Removal of Door "E"
4-3-4 Removal of Key Door & Spring
Disassembly and Reassembly
Upper Hinge
Lower Hinge Screws
Screws
Key Door Spring
Door "E"

4-3-5 Reassembly Test
Samsung Electronics 4-3
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 deive motor cover to the base plate
with a screw driver.
10. Remount the coupler in the correct position.
4-4 Replacement of Fuse
4-5 Replacement of Drive Motor
Disassembly and Reassembly
Screw
Drive Motor Cover Base Plate
Drive Motor
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.
1. Disconnect the oven from the power source.
2. When 15A 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.

4-6 Replacement of Control Circuit Board
4-6-1 Removal of Ass'y Control Box
4-4 Samsung Electronics
1. Be sure to ground any static electric charge in
your body and never touch the touch control
circuitry.
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.
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. Lift 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.
CONTROL BOX
SCREW
4-6-2 Remonal of Ass'y P.C.B
FPC
Connector
screw
screw
Disassembly and Reassembly

Samsung Electronics
5. Alignment and Adjustments
5-1 High Voltage Transformer
5-2 Low Voltage Transformer
5-3 Magnetron
5-1
1. Remove connectors from the transformer terminals
and check continuity.
2. Normal resistance readings are as follows:
(Room temperature = 20˚C)
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.
1. The low voltage transformer is located on the
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.
Filament Terminals
Secondary
Terminal
Primary
Terminals
Secondary Approx. 90Ω ± 10%
Filament Approx.0Ω
Primary Approx.0.4Ω ± 10%
Terminals Resistance
1~2(Input) 246.7 Ω
3~4(Output 2.9V) 9.55 Ω
5~6(Output13V) 1.63 Ω
Cooling Fins
Gasket Plate
Magnetron Antenna
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.

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.
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.
Samsung Electronics
5-4 High Voltage Capacitor
5-5 High Voltage Diode
5-6 Main Relay and Power Control Relay
5-7 Adjustment of Primary Switch, Door Sensing Switch and Monitor Switch
5-2
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 9MΩ.
3. A shorted capacitor will show continuous continuity.
4. An open capacitor will show constant 9MΩ.
5. Resistance between each terminal and chassis should read infinite.
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 KΩin
the other direction.
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.
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.
Alignment and Adjustments
Door Open Door Closed
Primary switch ∞0
Monitor switch (COM-NC) 0 ∞
Monitor switch (COM-NO) ∞0
Door Sensing S/W ∞0
Primary Interlock Switch
Lever Door(B)
Body Latch Door Sensing
Switch
Interlock
Monitor
Switch
5-2

Samsung Electronics 5-3
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 48 seconds exactly. (2 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;
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 E) by a factor of 91
times the of centigrade temperature.
4.187 x 1000 x ∆T
Output Power = 46.5
* Output (W) = 90 x ∆T
46.5 : Heating Time (sec)
4.187 : Coefficient for Water
1000 : Water (cc)
∆T : Temperature Rise (T2-T1)
5-8 Output Power of Magnetron
Alignment and Adjustments
CAUTION
MICROWAVE RADIATION
PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE GENERATOR OR OTHER PARTS
CONDUCTING MICROWAVE ENERGY.

Samsung Electronics
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.
Alignment and Adjustments
5-12 Leakage Measuring Procedure
5-9 Procedure for Measurement of Microwave Energy Leakage
5-11Note on Measurement
5-10 Check for Microwave Leakage
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/cm2 after 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.
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 arnear 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 neading should be less
than 4mW/cm2.
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.
Maximum allowable leakage is 5mW/cm2.
4mW/cm2is used to allow for measurement and meter accuracy
5-4

Samsung Electronics
6. Troubleshooting
6-1
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.
6-1 Electrical Maltunction
SYMPTOM CAUSE CORRECTIONS
Oven is dead. 1. Open or loose lead wire harness Checkfanmotorwhenthermalcutoutisdefective.
Fuse is OK. 2. Open thermal cutout (Magnetron)
No display and no operation at all. 3. Open low voltage transformer Check Ass'y PCB when LVT is defective.
4. Defective Ass'y PCB
No display and no operation at all. 1. Shorted lead wire harness Checkadjustmentofprimary, interlock monitor,
Fuse is blown. 2. Defective primary latch switch (NOTE 1) power relay, door sensing switch.
3. Defective monitor switch (NOTE1)
4. Shorted HVCapacitor
5. Shorted HVTransformer (NOTE2)
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 1. Key input is not in-Sequence Refer to operation procedure.
key input (Program) 2. Open or loose connection of membrane
key pad to Ass'y PCB
3. Shorted or open membrane panel
4. Defective Ass'y PCB Replace PCB main.
1. Off-alignment of latch switches Adjust door and 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
Timer starts countdown but no cause magnetron to lower output and/or
microwave oscillation. intermittent oscillation.
(No heat while oven lamp and 3. Defective high voltage components Check high voltage component according to
fan motor turn on.) H.V.Transformer component test procedure and replace if it is
H.V.Capacitor defective.
H.V.Diode, H.V.Fuse
Magnetron
4. Open or loose wiring of power relay
5. Defective primary latch switch
6. Defective power relay or Ass'y PCB Replace PCB main.

Samsung Electronics6-2
Troubleshooting
SYMPTOM CAUSE CORRECTIONS
Oven lamp and fan motor turn on 1. Misadjustment or loose wiring Adjust door and latch switches.
of primary latch switch
2. Defective primary latch switch
Oven can program but timer 1. Open or loose wiring of secondary Adjust door and interlock switches.
does not start. interlock switch
2. Off-alignment of primary interlock
3. Defective secondary interlock S/W
Microwave output is low;. 1. Decrease in power source voltage. Consult electrician.
Oven takes longer time to 2. Open or loose wiring of magnetron
cook food. filament circuit. (Intermittent oscillation))
3. Aging of magnetron
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 Defective Ass'y PCB Replace PCB main.
to the plugged in mode.
Loud buzzing noise can be heard. 1. Loose fan and fan motor Tighten screws of fan motor.
2. Loose screws on H.V.Transformer Tighten screws of H.V.Transformer.
3. Shorted H.V.Diode Replace H.V.Diode.
Turntable motor does not rotate. 1. Open or loose wiring of turntable motor. Replace turntable motor.
2. Defective turntable motor.
Oven stops operation during cooking 1. Open or loose wiring of primary Adjust door and latch switches.
interlock switch
2. Operation of thermal cutout(Magnetron)
Sparks 1. Metallic ware or cooking dishes Inform the customer.
touching on the oven wall.
2. Ceramic ware trimmed with gold or Do not use any type of cookware with
silver powder also causes sparks. metallic trimming.
Uneven cooking Uneven intensity of microwave due to Wrap thinner parts of the food with
its characteristics. 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 Noise may result from the motor. Replace turntable motor.
when it starts to operate.
6-2 Electrical Maltunction (continved)

Samsung Electronics
7. Exploded Views and Parts List
7-1 Exploded Views
7-1
MD09
MM01
MM52
MM22
MM28
MM171
MM16
MD01
MC01
MM14
MM128
MM30
MM31
MM27
MM07 MM03
MM34
M6
MM17
MM08
MM55
MB01 MM10
MM09
MM128-1
MM71
MM20
MM18
MM19
MM29
MD14
MD02
MD03
MD24 MD04
MD06 MD05
MD10
MD11
MD07
MD08
MC17
MC03
MC06
MC14
MC146
MC13
MC07
MC147
MC143
MC142 MC144
MC141
MB05 MB03
MB03
MB02
MB04
MC145
MC04
MC15

7-2 Main Parts List
7-2 Samsung Electronics
Exploded Views and Parts List
MW5286N/XBM
No. Code No. Description Specification Q'ty Remark
MB01 DE93-20020E ASSY BODY LATCH -,HANDLE,PP,FB44N,-,- 1
MB02 3405-000175 SWITCH-MICRO 250V,15A,200gf,SPST-NO 1
MB03 3405-000178 SWITCH-MICRO 250V,15A,200gf,SPST-NO 2
MB04 DE66-90054C LEVER-SWITCH PP,-,-,-,-,-,-,HANDLE,FB44N 1
MB05 DE66-40021D LATCH-BODY PP,HANDLE,FB44N 1
MM01 DE70-30001I PANEL-OUTER SECC,T0.6,360,1128,DEEPgGRN,MX 1
MM03 DE39-40505B WIRE HARNESS-A 120V60HZ,MW5574W,NEW,-,-,- 1
MM06 DE31-10156B ASSY-MOTOR FAN SMF-557UC,120/60,2600,MW5574W, 1
MM07 DE39-20049C ASSY POWER CORD KKP-30/SPT-2#3/16,125V13A,L135 1
MM08 OM75P(31)ESS ASSY-MAGNETRON:OM75P 1
MM09 DE71-60016A COVER-AIR PP,2,WHT,M945/M245,-,-,-,-,- 1
MM10 4713-001012 LAMP-INCANDESCENT 130V,-,40W,ORG,B/L,-,25X71 1CV/AIR
MM14 DE26-10098C TRANS-H.V SHV-5574UC1-1,120V,2170V/3.50V,60HZ,-,-,- 1
MM16 DE71-60011A COVER-MGT PP,T2.0,WHT,M745,-,-,-,-,- 1
MM17 DE47-20009A THERMOSTAT PW2N-520PB,160/60,250V/7.5A,H, 1
MM171 DE47-20173A THERMOSTAT PW-2N(90/60)30,187Y,250V7.5A,9 1
MM18 DE74-20015B TRAY-COOKING GLASS,T6.0,PI318,1050G,MW5630T 1
MM19 DE92-90189D ASSY-GUIDE ROLLER D19,STD,-,-,-,- 1
MM20 DE67-60075A COUPLER PPS,7G,BRN,M97G45,-,-,-,- 1
MM22 DE31-10154A MOTOR-SYNCHRONOUS M2HJ49ZR02,ST-16,50/60HZ,- 1
MM27 DE61-40066A FOOT -,PP,-,BLK,-,-,- 2
MM28 DE80-10001A BASE-PLATE -,-,T0.8,345,565,-,- 1
MM29 2501-001011 C-OIL 910nF,2100V,BK,54x35x75mm,20mm 1
MM30 DE61-50106A BRACKET-HVC -,SECC,T0.8,W31,L125.8,-,- 1
MM31 DE59-40001A DIODE-H.V HVR-1X-32B-12,-,-,-,-,- 1
MM34 3602-001002 FUSE-HOLDER 125V/250V,15A/7.5A,50mohm 1
MM52 DE63-90035G CUSHION-RUBBER DFA20,T2,W190,L100,BLK,-,-,- 1
MM55 3601-001197 FUSE-CARTRIDGE
250V,15A,SLOW-BLOW,CERAMIC,6.35x31.3mm
1
MM71 DE61-50490A BRACKET-TCO -,SECC1,T0.6,34,58,-,- 1
MM128 DE63-00008D CUSHION-SPONGE PUT-FOAM,T10W8,L200 1
MM128-1 DE63-00009H CUSHION-SPONGE PUT-FOAM,T35W15,L150 1

Samsung Electronics 7-3
Exploded Views and Parts List
7-3 Control & Door Parts List
MW5286N/XBM
No. Code No. Description Specification Q'ty Remark
MC01 DE93-30546P ASSY CONTROL-BOX -,MW5286N/XBM,GRN,-,- 1 S.N.A
MC03 DE72-70211P CONTROL-PANEL ABS(HR0370D),GRN,-,-,MW5286N/X 1
MC04 DE61-70046A SPRING-DOOR STS304-01,-,-,-,-,-,- 1
MC06 DE67-40145A WINDOW-DISPLAY ACRYL,T2,W40,L77,SMOG,30G,-,-, 1
MC07 RA-5286-00 ASSY PCB PARTS MW5286,AC120V50Hz 1
MC13 DE93-30543P ASSY CONTROL-PANEL 120V60Hz,MW5286N/XBM,-,-,- 1
MC14 DE66-20179A BUTTON-SELECT ABS(HR0370),NTR,30G,RE-445,-,- 1
MC141 DE66-20285B BUTTON-SELECT(A) PC,-,-,2g,-,GRN,MW5286N/XBM,- 1
MC142 DE66-20175F BUTTON-SELECT-B ABS(HR0370D),5G,-,GRN,M959GR/X 1
MC143 DE66-20176F BUTTON-SELECT-C ABS(HR0370D),5G,-,GRN,M959GR/X 1
MC144 DE66-20177F BUTTON-SELECT-D ABS(HR0370D),2G,GRN,M959GR/XEU 1
MC145 DE66-20178F BUTTON-SELECT-E ABS(HR0370D),2G,-,GRN,M959GR/X 1
MC146 DE66-20197U BUTTON-SELECT(A-B) PC,-,-,2g,-,GRN,MW5286N/XBM,- 1
MC147 DE66-20198U BUTTON-SELECT(A-C) PC,-,-,2g,-,GRN,MW5286N/XBM,- 1
MC15 DE66-20173T BUTTON-START ABS-HR0370D,-,-,7g,-,GRN,MW528 1
MC17 DE71-60366X COVER-PANEL ABS(HR0370D),-,-,-,GRN,MW5286N 1
MD01 DE92-40175V ASSY DOOR MW5286N/XBM,GRN,-,-,-,-,- 1
MD02 DE64-40263H DOOR-A ABS(HR0370D),160G,GRN,M959GR/X 1
MD03 DE64-40265D DOOR-SCREEN ACRYL(IF850)ED17,M959,-,-,-,-, 1
MD04 DE92-50127H ASSY DOOR-E COATING,BLACK,T0.8,-,-,-,- 1
MD05 DE01-00002B FILM-DOOR 1
MD06 DE64-40012A DOOR-C RESIN-PP(TB53),T2.0,CE945GF,BL 1
MD07 DE61-70126A SPRING-KEY 0.8,0,36,6,BLUING,-,- 1
MD08 DE61-80002A HINGE-UPPER SCP1,T2.3,26,77,ZPC3,WHT,CE945 1
MD09 DE61-80003A HINGE-LOWER SCP1,T2.3,26,77,ZPC3,WHT,CE945 1
MD10 DE64-00028A DOOR-KEY POM,BLK,CE2974,- 1
MD11 DE92-40207B ASSY DOOR-SUB MW5575G,BLK,DOOR-FILM,-,-,-,- 1
MD14 DE64-20112E HANDLE-DOOR ABS(HR0370D),30G,GRN,-,M959GR/ 1
MD24
S.N.A : SERVICE NOT AVAILABLE
DE92-40197M ASSY DOOR-A MW5286N/XBM,GRN,-,-,-,-,- 1

7-4 Samsung Electronics
Exploded Views and Parts List
7-4 Standard Parts List
MW5286N/XBM
Code No. Description Specification Q'ty Remark
DE60-10045A SCREW-TAP PH -,-,FEFZY,-,PH,M3,-,L6,-,- 1MGT-TC
DE60-10053A SCREW-TAP PH -,-,FEFZY,-,PH,M4,-,L10,-,- 1FUSE-H
DE60-10080B SCREW-WASHER -,2S,SWRCH18A,ZP2,PH,PI5,-,L10,-,- 4HVT
DE60-10080B SCREW-WASHER -,2S,SWRCH18A,ZP2,PH,PI5,-,L10,-,- 4MGT
DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 2B-LATC
DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 2BASE
DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 2C-BLOW
DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 2C-PANE
DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 1 MEM-PN
DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 5OPANEL
DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 1P/EART
DE60-10098A SCREW-ASSY TAP TITE -,GLD,SWRCH18A,ZPC2,PH,TC,-,M4X8,WT,- 1CV-TCO
DE60-10098A SCREW-ASSY TAP TITE -,GLD,SWRCH18A,ZPC2,PH,TC,-,M4X8,WT,- 2M/GEAR
DE60-20063A BOLT-FLANGE M4,10,ZPC3,YEL,MSWR,-,-,-,- 2HI-LOW
DE60-20063A BOLT-FLANGE M4,10,ZPC3,YEL,MSWR,-,-,-,- 2HI-UPP
DE60-10045A SCREW-TAP PH -,-,FEFZY,-,PH,M3,-,L6,-,- 1
DE60-10066A SCREW-TAP TH -,-,FEFZY,2-SLOT,TH,M4,-,L8,-,- 2H/DOOR
DE60-10082J SCREW-TAPPING -,WS,ZPC,YEL,TH,2S-4X8,-,MSWR3,-,- 1
DE60-10012A SCREW-TAP TITE -,SWR10,M4,L10,TH,+,-,3,ZPC2,- 1
DE60-10088A SCREW-TAP PH -,-,FEFZY,PLAIN,PH,M3,-,L8,-,- 1PCB