SAMSUNG MR5481GXAA Service Manual

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MICROWAVE OVEN

MR5481G / MR5482W MR6481G / MR6482W

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

SEA

Auto

Defrost

Auto

Reheat

Pause Cancel

Start

Clock

Auto Start

Hold

Timer

One Minute +

Popcorn

Diet Cook

Potato

Frozen Dinner

Fresh

Vegetable

Frozen

Breakfast

More/LessPower Level

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.

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 A VOID 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/cm

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.

SAMSUNG ELECTRONICS AMERICA, INC. HEADQUARTER OFFICE 105 CHALLENGER ROAD RIDGEFIELD PARK N.J.07660-0511

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 and secondary switches, 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 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 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

2. Specifications

2-1 Table of Specifications

Samsung Electronics 2-1

MODEL MR5481G / MR5482W MR6481G / MR6482W

ITEM TIMER 99 MINUTES 99 SECONDS 99 MINUTES 99 SECONDS POWER SOURCE 120V/60HZ, AC 120V/60HZ, AC POWER CONSUMPTION MICROWAVE : 1,300W MICROWAVE : 1,400W OUTPUT POWER FROM 90W TO 900W (10 LEVEL POWER) FROM 90W TO 900W (10 LEVEL POWER)

(IEC-705 TEST PROCEDURE) (IEC-705 TEST PROCEDURE) OPERATING FREQUENCY 2,450MHz 2,450MHz MAGNETRON OM75PH(31)ESS OM75P(B1)ESS COOLING METHOD COOLING FAN MOTOR COOLING FAN MOTOR OUTSIDE DIMENSIONS 20

11/32

(W) x 11

11/32

(H) x 14

5/8

(D) 21

29/32

(W) x 12

11/32

(H) x 16

29/32

(D) NET WEIGHT 33.1 lbs. 40.8 lbs. SHIPPING WEIGHT 37.5 lbs 46.3 lbs.

2-2 Comparison Chart

MODEL

MR5481G / MR5482W

MR6481G / MR6482W

FEATURE

MORE/LESS O AUTO REHEAT O AUTO DEFROST O TIME COOK O POWER LEVEL O INSTANT COOK O MEMORY O BOOST CHILD LOCK O CLOCK O GRILL COMBI -

Auto

Defrost

Auto

Reheat

Pause

Cancel

Start

Clock

Auto Start

Hold

Timer

One Minute +

Popcorn

Diet Cook

Potato

Frozen Dinner

Fresh

Vegetable

Frozen

Breakfast

More/LessPower Level

1. One Minute + Button

2. Auto Defrost Button

3. Power Level Selection Button

4. Clock/Auto Start Button

5. Hold/Timer Button

6. More/Less Button

7. Pause Canel Button

8. Start Button

9. Instant Cook Buttons

10. Auto Reheat Button

11.Number Key Buttons

3. Operating Instructions

3-1 Control Panel

Samsung Electronics 3-1

3-2 Features & External Views

Door

Ventilation Slot Light

Safety Interlock Holes

Control Panel

Open Door Push Button

Guide Roller

Glass Plate

Door Latches

Auto

Defrost

Auto

Reheat

Pause

Cancel

Start

Clock

Auto Start

Hold Timer

One Minute +

Popcorn

Diet Cook

Potato

Frozen Dinner

Fresh

Vegetable

Frozen

Breakfast

More/LessPower Level

MR5481G / MR5482W:517mm MR6481G / MR6482W:556mm

MR5481G / MR5482W : 369mm

MR6481G / MW6482W : 402mm

MR5481G / MR5482W : 297.3mm

MR6481G / MR6482W : 313mm

MR5481G / MR5482W : 216.4mm

MR6481G / MR6482W : 260mm

MR5481G / MR5482W : 317.4mm

MR6481G / MR6482W:429mm

Auto

Defrost

Auto

Reheat

Pause Cancel

Start

Clock

Auto Start

Hold Timer

One Minute +

Popcorn

Diet Cook

Potato

Frozen Dinner

Fresh

Vegetable

Frozen

Breakfast

More/LessPower Level

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 the air cover.

3. Remove screws securing the magnetron to the wave guide.

4. Take out the magnetron very carefully.

5. Remove screws from the back panel.

6. Take out the fan motor.

7. Remove the oven lamp by pulling 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

Cover Air

Magnetron

H. V. Trans

H. V. Capacitor

Thermo S/W

Fan Motor

Screw

H. V. Trans

Bolts

4-3 Replacement of Door Assembly

4-3-1 Removal of Door Assembly

4-2 Samsung Electronics

Remove screws securing the upper hinge and lower hinge. Then remove the door assembly.

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.

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"

Disassembly and Reassembly

Upper Hinge

Lower Hinge

Screw

Door "C"

Door "A"

Door "E"

4-3-4 Removal of Key Door & Spring

Key Door

Spring

Door "E"

Samsung Electronics 4-3

1. Disconnect the oven from the power source.

2. Remove the 15A(MR5481G / MR5482W) /

20A(MR6481G / MR6482W) fuse in the fuse holder.

3. When replacing the fuse, be sure to use an exact replacement part. If new fuse blows out again after replacement, check the primary interlock switch, door sensing switch and interlock monitor switch.

4. 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.

1. Take out the glass tray and the guide roller from the cavity.

Turn the oven upside down to replace the drive motor.

3. Remove 4 screws securing the buttom plate.

4. Remove a screw securing the drive motor cover.

5. Disconnect all the lead wires from the drive motor.

6. Remove screws securing the drive motor to the cavity.

7. Remove the drive motor and the coupler.

8. When replacing the drive motor, be sure to remount it in the correct position with the coupler.

9. Connect all the leads to the drive motor.

10. Screw the drive motor cover to the base plate with a screw driver.

4-4 Replacement of Fuse

4-5 Replacement of Drive Motor

Disassembly and Reassembly

Screw

Drive Motor Cover Base Plate

Thermo Switch

Drive Motor

4-3-5 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.

4-6 Replacement of Control Circuit Board

4-6-1 Removal of Control Box Assembly

4-4 Samsung Electronics

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.

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.

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.

4-6-2 Removal of P.C.B Assembly

4-6-3 Removal of Window Display & Membrane Panel

Disassembly and Reassembly

Control Box

FPC Connector

Screw

Membrane

Panel

Window

Display

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 = 20ûC)

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.

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.

Filament Terminals

Secondary

Terminal

Primary Terminals

MODEL

SHV-557UC1

Secondary 90Ω ± 10%

Filament Shows Continuity Primary 0.40Ω ϒ± 10%

Resistance

DN-5574W CE-5574W

1~2(Input) 312.3Ω 286.5Ω 4~5(Output17V) 11.22Ω 9.245Ω 7~8(Output2.7V) 2.213Ω 1.735Ω

Cooling Fins

Gasket Plate

Magnetron Antenna

Terminals

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 KΩ in

the other direction.

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.

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 interlock,secondary interlock and door sensing 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 Secondary switch ∞ 0 Monitor switch (COM-NC) 0 ∞

Door Sensing S/W ∞ 0

Primary Interlock Switch

Secondary Interlock Switch

Lever Door

Body Latch

Door Sensing Switch

Interlock Monitor Switch

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 the water temperature ("T1", 10±1ûC) in the glass vessel.

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. (1 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 T1from T

. 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 9ûC to 11ûC 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 80(90) times the of centigrade temperature.

4.187 x 1000 x ∆T+0.88xMcx(T2-T0)

Output Power =

46.5

46.5: Heating Time (sec)

4.187 : Coefficient for Water 1000 : Water (cc)

∆T : Temperature Rise (T

2-T1

) Mc : Cylindrical borosilicate glass weight To : Room temperature.

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.

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:

Minimum

Temperature Rise

Heat Distribution = X 100(%)

Maximum

Temperature Rise

The result should exceed 65%.

5-9 Microwave Heat Distribution - Heat Evenness

D/4

Cooking Tray

Beaker

Samsung Electronics5-4

Alignment and Adjustments

5-13 Leakage Measuring Procedure

5-9-1 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 5 mW/§† 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 ;

SAMSUNG ELECTRONICS AMERICA, INC. HEADQUARTER OFFICE 105 CHALLENGER ROAD RIDGEFIELD PARK N.J.07660-0511

5-9-2 At least once a year have the microwave energy survey meter checked for accuracy by its manufacturer.

5-10 Procedure for Measurement of Microwave Energy Leakage

5-12. Note on Measurement

5-11 Check for Microwave Leakage

1) Pour 275 ±15cc of 20±5ûC ( 68± 9ûF ) 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 2 inches to any metal. If it gets closer than 2 inches, erroneous readings may result.

5) Measured leakage must be less than 5mW/cm2, after repair or adjustment.

1. Remove the outer panel.

2. Pour 275±15cc of 20±5ûC(68±9ûF) 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 5mW/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.

Auto

Defrost

Auto

Reheat

Pause Cancel

Start

Clock

Auto Start

Hold

Timer

One Minute +

Popcorn

Diet Cook

Potato

Frozen Dinner

Fresh

Vegetable

Frozen

Breakfast

More/LessPower Level

Maximum allowable leakage is 5mW/cm2. 4mW/cm2is used to allow for measurement and meter accuracy

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 Malfunction

SYMPTOM CAUSE CORRECTIONS

Oven is dead. 1. Open or loose lead wire harness Check fan motor when thermal cutout is defective. 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 Check adjustment of primary, interlock monitor, Fuse is blown. 2. Defective primary latch switch (NOTE 1) 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 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. Check the wire of turntable motor.

2. Defective turntable motor. Replace 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.

6-1 Electrical Malfunction(continued)

Samsung Electronics

7. Exploded Views and Parts List

7-1 Exploded Views

7-1

M29

I 4

M21

M22

M23

M24

M25

M26

M11

M13

M14

M15

M12

M16

M17

M18

M19

I 3

M32

M20

M10

I 1

M27

M28

M31

M30

I 2

7-2 Main Parts List (MR5481G / MR5482W)

7-2 Samsung Electronics

Exploded Views and Parts List

Ref. No. Parts No. Description/Specification Q'ty Remarks

M 1 DE70-30001W PANEL-OUTER;V/STEEL T0.5+T0.2 W360 L1128 1 MR5481G M 1 DE70-30001U PANEL-OUTER;SECC T0.6 W360 L1128 WHT MR548 1 MR5482W M 2 DE91-40100A ASSY NOISE FILTER;SN-U15A 250V 15A SECA 1 M 4 DE31-10156B MOTOR-FAN;SMF-557UC 120/60 2600 MW5574W 1 M 5 DE39-40682A WIRE HARNESS-A;120V60HZ MR6482GSEA (RV) 1 M 6 DE47-20009A THERMOSTAT;CS-7SA(160/60)187Y 250V7.5A 1 1 M 7 DE03-30035A MAGNETRON;OM75PH(31)ESS 1 M 8 4713-001012 LAMP-INCANDESCENT;130V,-,40W,ORG,B/L,-,2 1 M 9 DE71-60016A COVER-AIR;PP 2 WHT M945/MB45 1 M 10 DE93-20001A ASSY BODY LATCH;2ND-W1 M97G45/M9745 1 M 11 DE66-90013A LEVER-DOOR;POM(F20-01) NTR MW5630T 1 M 12 DE26-10134A TRANS-H.V;SHV-5574UC1 120V 2160V/3.35V 1 M 13 2501-001039 C-OIL;910nF,2100V,BK,35x54x75,20mm 1 M 14 DE61-50106A BRACKET-HVC;SECC T0.8 W31 L125.8 1 M 15 DE91-70063A ASSY-H.V.D;V2M6 PI9.0 0.05MT 1 M 16 DE74-20015B TRAY-COOKING;GLASS T6.0 PI318 1050G MW56 1 M 17 DE92-90189D ASSY-GUIDE ROLLER;D19 STD 1 M 18 DE67-60026C COUPLER;PTFE 12G WHT MB245 1 M 19 DE61-40065A FOOT;PP BLK T2x22x17mm 2 M 20 DE80-10001A BASE-PLATE;SGCC T0.8 345 565 1 M 21 DE31-10154A MOTOR-DRIVE;M2HJ49ZR02,ST-16 21V 5/6 1 M 22 DE71-60011A COVER-MGT;PP T2.0 WHT M745 1 M 23 ASSY CONTROL-BOX;120V60Hz MR5481G D/GRY 1 MR5481G M 23 ASSY CONTROL-BOX;120V60Hz MR5482W WHT 1 MR5482W M 24 ASSY DOOR;TOUCH GRAY MW5471G 1 MR5481G M 24 ASSY DOOR;TOUCH WHT MW5470W 800W 1 MR5482W M 25 DE61-80003A HINGE-LOWER;SCP1 T2.3 26 77 ZPC3 WHT CHR 1 M 26 DE61-80002A HINGE-UPPER;SCP1 T2.3 26 77 ZPC3 WHT CHR 1 M 27 DE39-20037G ASSY POWER CORD;KKP-30B 120V60HZ 1150 GRY 1 M 28 DE47-20173A THERMOSTAT;PW-2N(90/60)30 187Y 250V7.5A 1 M 29 DE63-90035G CUSHION-RUBBER;DFA20 T2 W190 L100 BLK 1 M 30 DE61-50490A BRACKET-TCO;SECC1 T0.6 34 58 1 M 31 DE91-70101C ASSY-THERMOSTAT;MW5574W 160/60 187-HORIZ 1 M 32 DE60-60025A PIN-FOOT;PP-JI350 BLK 1

: Option Parts

: Warning

:Electrostatically Sensitive Devices

Samsung Electronics 7-3

7-3 Door Parts List (MR5481G / MR5482W)

Ref. No. Parts No. Description/Specification Q'ty Remarks

D 1 DE64-40241B DOOR-A;ABS WHT (HRO370) GRY MW5471G 1 MR5481G D 1 DE64-40241A DOOR-A;ABS WHT M841 1 MR5482W D 2 DE64-40006A DOOR-KEY;POM(TC3005) T2.0 12GR BLK CE945G 1 MR5481G D 2 DE64-40006B DOOR-KEY;POM(TC3005) T2 12GR WHT MW5574 1 MR5482W D 3 DE61-70032A SPRING-KEY;ES HSWR PI0.6 D5.4 L25 MW8640 1 D 4 DE67-20157B SCREEN-DOOR;PC T0.5 181.5 331.5 GRY MW5471G 1 MR5481G D 4 DE67-20157A SCREEN-DOOR;PC T0.5 188 331 PURE-WHT NEWGU 1 MR5482W D 5 DE92-50127H ASSY DOOR-E;COATING BLACK T0.8 1 MR5481G D 5 DE92-50127I ASSY DOOR-E;COATING WHITE T0.8 1 MR5482W D 6 DE64-40012A DOOR-C;RESIN-PP(TB53) T2.0 CE945GF BLACK 1 MR5481G D 6 DE64-40040B DOOR-C;PP(TB53) T1.5 BLK 1.2CU.FT M245 1 MR5482W D 7 DE01-00002B FILM-DOOR;PC T0.15 275 175 MW5574W 1

7-4 Control Parts List (MR5481G / MR5482W)

Ref. No. Parts No. Description/Specification Q'ty Remarks

C 1 DE66-20010B BUTTON-PUSH;ABS D-GRY MW4371G 1 MR5481G C 1 DE66-20010A BUTTON-PUSH;ABS (VH-080) WHT 17.6G MW4370W 1 MR5482W C 2 DE61-70076A SPRING-BUTTON;HSWR PI0.6 1 C 3 DE34-10217S SWITCH-MEMBRANE;PET 120V 0.5A 174.5x91.5 1 MR5481G C 3 DE34-10217V SWITCH-MEMBRANE;PET 120V60HZ W91.5xL174.5 1 MR5482W C 4 DE72-70161B CONTROL-PANEL;ABS(HR0370U) GRY MW5471G 1 MR5481G C 4 DE72-70161A CONTROL-PANEL;ABS(VH-0800) PURE-WHT MW5470W 1 MR5482W C 5 DE67-40003A WINDOW-DISPLAY;ACRYL T2.3 W36.8 L91.8 SM 1 C 6 DE91-10368A ASSY P.C.B-MAIN;120V/60HZ NS V.F.D N/HEL 1 C 7 DE93-30402B ASSY CONTROL-PANEL;NEWGARD 0.9 1 MR5481G C 7 DE93-30402A ASSY CONTROL-PANEL;120V60HZ NEWGARD MW5470W 1 MR5482W

7-5 Body Latch Parts List (MR5481G / MR5482W)

Ref. No. Parts No. Description/Specification Q'ty Remarks

B 1 DE66-40001A LATCH-BODY;POM(F20-02) 40GR NTR 1 B 2 3405-000178 SWITCH-MICRO;250V,15A,200gf,SPST-NO 3 B 3 3405-000175 SWITCH-MICRO;250V,15A,200gf,SPST-NO 1 B 4 DE66-90001A LEVER-SWITCH;P.O.M(F20-02) 2 6 NTR 2ND-W 1

Exploded Views and Parts List

7-2 Main Parts List (MR6481G / MR6482W)

7-4 Samsung Electronics

Exploded Views and Parts List

Ref. No. Parts No. Description/Specification Q'ty Remarks

M 1 DE70-30002K PANEL-OUTER;V/STEEL T(0.5+0.2) W424.7 L1155 1 MR6481G M 1 DE70-30002J PANEL-OUTER;SECC T0.6 W424.7 L1155 P/WHT 1 MR6482W M 2 DE91-40101A ASSY NOISE FILTER;SN-U20A 250V 20A SECA 1 M 3 DE63-90167A CHSHION-HVT;NEOPRENE/RUBBER T36.5 W40 L50 B 1 M 4 DE31-10157A MOTOR-FAN;SMF 657UC 120/60 2600 MB6774W 1 M 5 DE39-40682A WIRE HARNESS-A;120V60HZ MR6482G SEA(RV) 1 M 6 DE47-20009A THERMOSTAT;CS-7SA(160/60)187Y 250V7.5A 1 1 M 7 DE03-30035A MAGNETRON;OM75PH(31)ESS 1 M 8 4713-001012 LAMP-INCANDESCENT;130V,-,40W,ORG,B/L,-,2 1 M 9 DE71-60016A COVER-AIR;PP 2 WHT M945/MB45 1 M 10 DE93-20001A ASSY BODY LATCH;2ND-W1 M97G45/M9745 1 M 11 DE66-90013A LEVER-DOOR;POM(F20-01) NTR MW5630T 1 M 12 DE26-10134A TRANS-H.V;SHV-5574UC1 120V 2160V/3.35V 1 M 13 2501-001011 C-OIL;910pF,2100V,BLK,54x35x75mm,20mm 1 M 14 DE61-50106A BRACKET-HVC;SECC T0.8 W31 L125.8 1 M 15 DE91-70063A ASSY-H.V.D;V2M6 PI9.0 0.05MT 1 M 16 DE74-20002A TRAY-COOKING;GLASS T6. PI360 1.2CUFT NEG 1 M 17 DE92-90189B ASSY-GUIDE ROLLER;D16.5 STD 1 M 18 DE67-60002A COUPLER;PPS 5GR BRN M97G45 M 19 DE61-40065A FOOT;PP BLK T2x22x17mm 2 M 20 DE80-10002C BASE-PLATE;SGCC T0.8 L404 L633 MR6481G 1 M 21 DE31-10154A MOTOR-DRIVE;M2HJ49ZR02,ST-16 21V 5/6 1 M 22 DE71-60164F COVER-MGT;PP (TB53/A353) 30G MW5430/6430 1 M 23 ASSY CONTROL-BOX;120V60Hz MR6481G GRAY 1 MR6481G M 23 ASSY CONTROL-BOX;120V60Hz MR6482W WHT 1 MR6482W M 24 ASSY DOOR;P/BUTTON D/GRY MW6371G NEGARD 1 MR6481G M 24 ASSY DOOR;P/BUTTON WHT MW6370W NEGARD 1 MR6482W M 25 DE61-80003A HINGE-LOWER;SCP1 T2.3 26 77 ZPC3 WHT CHR 1 M 26 DE61-80002A HINGE-UPPER;SCP1 T2.3 26 77 ZPC3 WHT CHR 1 M 27 DE39-20037G ASSY POWER CORD;KKP-30B 120V60HZ 1150 GRY 1 M 28 DE47-20033A THERMOSTAT;PW-2N 80/70 125V15A/250V7.5A 187 1 M 29 DE63-90035I CUSHION-RUBBER;DFA20 T1.5 W190 L100 BLK JE1 1 M 30 DE61-50490A BRACKET-TCO;SECC1 T0.6 34 58 1 M 31 DE91-70101C ASSY-THERMOSTAT;MW5574W 160/60 187-HORIZ 1 M 32 DE60-60025A PIN-FOOT;PP-JI350 BLK 1

: Option Parts

: Warning

:Electrostatically Sensitive Devices

Samsung Electronics 7-5

7-3 Door Parts List (MR6481G / MR6482W)

Ref. No. Parts No. Description/Specification Q'ty Remarks

D 1 DE64-40241B DOOR-A;ABS WHT (HRO370) GRY MW5471G 1 MR6481G D 1 DE64-40242A DOOR-A;ABS T2.5 W300 L450 300G 1 MR6482W D 2 DE64-40006A DOOR-KEY;POM(TC3005) T2.0 12GR BLK CE945G 1 MR6481G D 2 DE64-40006B DOOR-KEY;POM(TC3005) T2 12GR WHT MW5574W 1 MR6482W D 3 DE61-70128A SPRING-KEY;HSW3 PI0.6 D5 BLUING 1 D 4 DE64-40262B DOOR-SCREEN;PC T0.5 W205 L394 MW6371G 1 MR6481G D 4 DE64-40262A DOOR-SCREEN;PC T0.5 W205 L384 NEWGARD 1 MR6482W D 5 DE92-50128F ASSY DOOR-E;COATING BLK MW6575G 1 MR6481G D 5 DE92-50128E ASSY DOOR-E;COATING WHT MW6574W 1 MR6482W D 6 DE64-40010B DOOR-C;PP(TB53) T1.5 BLK 1.2CU.FT M245 1 MR6481G D 6 DE64-40010A DOOR-C;PP(TB53) T1.5 WHTMW6574W 1 MR6482W D 7 DE01-00004A FILM-DOOR;PE T0.15 W189 L331 NTR 1.2CU.FT 1 D 8 DE02-00082A TAPE-DOUBLE FACE;PET T0.4 W9 WHT SEIL SI 1

7-4 Control Parts List (MR6481G / MR6482W)

Ref. No. Parts No. Description/Specification Q'ty Remarks

C 1 DE66-20010B BUTTON-PUSH;ABS D-GRY MW4371G 1 MR6481G C 1 DE66-20010A BUTTON-PUSH;ABS(VH080) WHT 17.6G MW4370W 1 MR6482W C 2 DE61-70076A SPRING-BUTTON;HSWR PI0.6 1 C 3 DE34-10217N SWITCH-MEMBRANE;PET 125V 91X190 MR6481G 1 MR6481G C 3 DE34-10217M SWITCH-MEMBRANE;PET 125V 91X190 MR6482W 1 MR6482W C 4 DE72-70162B CONTROL-PANEL;ABS250G D/GRY T2.5 MW6371G 1 MR6481G C 4 DE72-70162A CONTROL-PANEL;ABS 250G T2.5 1 MR6482W C 5 DE67-40003A WINDOW-DISPLAY;ACRYL T2.3 W36.8 L91.8 SM 1 C 6 DE91-10368A ASSY P.C.B-MAIN;120V/60HZ NS V.F.D N/HEL 1 C 7 DE93-30405B ASSY CONTROL-PANEL;120V60HZ MW6371G 1.2(D/GRY) 1 MR6481G C 7 DE93-30405A ASSY CONTROL-PANEL;120V60HZ MW6370W 1.2(WHT) 1 MR6482W

7-5 Body Latch Parts List (MR6481G / MR6482W)

Ref. No. Parts No. Description/Specification Q'ty Remarks

B 1 DE66-40001A LATCH-BODY;POM(F20-02) 40GR NTR 1 B 2 3405-000178 SWITCH-MICRO;VP-533A-OF-PS(T85) 250V,15A 3 B 3 3405-000175 SWITCH-MICRO;VP-531A-OF(T85) 250V,15A,20 1 B 4 DE66-90001A LEVER-SWITCH;P.O.M(F20-02) 2 6 NTR 2ND-W 1

Exploded Views and Parts List

7-6 Standard Parts List (MR5481G/MR5482W/MR6481G/MR6482W)

Parts No. Description / Specification Q'ty Remarks

DE60-10082A SCREW-A;M4 L12 2S TOOTHED 2 BASE DE60-10088A SCREW-TAP PH;PH M3 L8 FEFZY PLAIN 2 PCB DE60-10082A SCREW-A;M4 L12 2S TOOTHED 2 B-LATC DE60-10082A SCREW-A;M4 L12 2S TOOTHED 2 C-PANE DE60-10082A SCREW-A;M4 L12 2S TOOTHED 5 O-PANEL DE60-10082A SCREW-A;M4 L12 2S TOOTHED 1 P/EART DE60-10080A SCREW-WASHER;M5 L12 2S 4 HVT DE60-10080A SCREW-WASHER;M5 L12 2S 4 MGT DE60-10033A SCREW-TH;TH + M4 L10 MSWR10 FEFZY 2 HI-LOW DE60-10082A SCREW-A;M4 L12 2S TOOTHED 2 C-BLOW DE60-10033A SCREW-TH;TH + M4 L10 MSWR10 FEFZY 2 HI-UPP DE60-10045A SCREW-TAP PH;PH M3 L6 FEFZY 2 MGT-TC DE60-10082A SCREW-A;M4 L12 2S TOOTHED 1 MEM-PN DE60-10098A SCREW-ASSY TAPTITE;PH TC M4X8 SWRCH18A Z 1 CV-TCO DE60-10098A SCREW-ASSY TAPTITE;PH TC M4X8 SWRCH18A Z 2 M/GEAR DE60-10113A SCREW-TAP PH;2S-4X12 FE ZPC3 1 FUSE-H DE60-10188A SCREW-ASSY TAP;2S-4X8 MSW3ZPC YEL WS Q1 B/HVC

7-7 Installation Parts List (MR5481G/MR5482W/MR6481G/MR6482W)

Ref. No. Parts No. Description/Specification Q'ty Remarks

I 1 DE64-90154A TRIMMER-UPPER;SECC T0.8 W53.1 L532.2 1 MR5481G I 1 DE64-90154B TRIMMER-UPPER;SECC T0.8 W53.1 L532.2 WHT 1 MR5482W I 1 DE64-90153A TRIMMER-UPPER;SECC T0.8 W54 L571 BLK COATI 1 MR6481G I 1 DE64-90153B TRIMMER-UPPER;SECC T0.8 W54 L571 WHT COATI 1 MR6482W I 2 DE64-90155A TRIMMER-LOWER;SECC T0.8 W42.3 L532.2 1 MR5481G I 2 DE64-90155B TRIMMER-LOWER;SECC T0.8 W42.3 L532.2 WHT 1 MR5482W I 2 DE64-90155A TRIMMER-LOWER;SECC T0.8 W42.3 L571 BLK COATI 1 MR6481G I 2 DE64-90152B TRIMMER-LOWER;SECC T0.8 W54 L571 WHT COATI 1 MR6482W I 3 DE70-40311A PLATE-BOTTOM;SGCC T0.6 W253 L264.5 MR5481 1 I 4 DE72-50092A DUCT-AIR;SGCC T0.6 W150 L212 MR5481G 1

7-4 Samsung Electronics

8. P.C.B Diagrams

8-1 P.C.B Diagrams

Samsung Electronics 8-1

8-2 Samsung Electronics

Parts No. Description / Specification Q'ty Remarks

0401-001002 DIODE-SWITCHING;1N4148M,100V,200mA,500mW 16 D05~20 0402-000559 DIODE-RECTIFIER;D4G,400V,1A,T-1 3 D01,02,04 0501-000283 TR-SMALL SIGNAL;KSA539-Y,PNP,400mW,TO-92 1 Q08 0504-001014 TR-DIGITAL;KSR1005,NPN,300mW,4.7K-10K,TO 5 Q01,06,07,09,10 0504-001015 TR-DIGITAL;KSR2005,PNP,300mW,4.7K-10K,TO 4 Q02~05 1405-000129 VARISTOR;INR14D271K 270V,4500A 17X12MM,T 1 ZNR1 2001-000037 R-CARBON(S);330ohm,5%,1/2W,AA,TP,2.4x6.4 2 R03~04 2001-000273 R-CARBON;100Kohm,5%,1/8W,AA,TP,1.8x3.2m 2 R17,21 2001-000290 R-CARBON;10Kohm,5%,1/8W,AA,TP,1.8x3.2mm 5 R07,10,14,15,19 2001-000429 R-CARBON;1Kohm,5%,1/8W,AA,TP,1.8x3.2mm 4 R05,06,11,12 2001-000515 R-CARBON;220ohm,5%,1/8W,AA,TP,1.8x3.2mm 1 R09 2001-000577 R-CARBON;2Kohm,5%,1/8W,AA,TP,1.8x3.2mm 1 R13 2001-000613 R-CARBON;3.9Kohm,5%,1/8W,AA,TP,1.8x3.2m 8 R16,18,20,26~30 2001-000780 R-CARBON;470ohm,5%,1/8W,AA,TP,1.8x3.2mm 2 R01,02 2001-000786 R-CARBON;47Kohm,5%,1/8W,AA,TP,1.8x3.2mm 20 R31~50 2001-000904 R-CARBON;620ohm,5%,1/8W,AA,TP,1.8x3.2mm 1 R08 2011-000582 R-NETWORK;47Kohm,5%,1/8W,A,SIP,9P,TP 1 AR01 2202-000121 C-CERAMIC,MLC-AXIAL;UP050B101KBB 100PF,1 1 C09 2202-000127 C-CERAMIC,MLC-AXIAL;TP050F103ZB 10NF,+80 1 C10 2202-000780 C-CERAMIC,MLC-AXIAL;UP050F104Z 100NF,+80 4 C05~07,11 2401-000247 C-AL;1SA1ANB107MAN 100UF,20%,10V,GP 6.3X 1 C14 2401-000466 C-AL;CESSM1V100M0507 10UF,20%,35V,GP 5X7 1 C08 2401-000914 C-AL;CESSL1C220M0511AA 22UF,20%,16V,GP 5 1 C03 2401-001412 C-AL;1SG1VFB477MAN 470UF,20%,35V,GP 10X1 2 C01,02 2802-000161 RESONATOR-CERAMIC;CST4.00MGW-TF01-3/CN 4 1 X-TAL 3501-001014 RELAY-POWER;OM1F-S-124LM 24V,21.8MA,17A 1 RY02 3501-001016 RELAY-MINIATURE;JV24-KT 24V,12.5MA,5A 1F 1 RY01 3708-000529 CONNECTOR-FPC/FC/PIC;FCZ254-14SL,BLK 14P 1 CON05 3711-000240 CONNECTOR-HEADER;1WALL,4P,1R,3.96mm,STRA 1 CON01 3711-000881 CONNECTOR-HEADER;SMW250-03,WHT BOX,3P,1R 1 CON04 A4106-0154 DIODE-ZENER;TZP5.1B 5.1/5.7V 40MA T 1W 3 ZD01~03 DE07-10035A V.F.DISPLAY;SVM-07SS10 SEA 1 VFD1 DE09-30491A IC-MCU;MB89143AP-168 8K DIP 64PIN 1 IC01 DE13-20009A IC;KA7533 DIP 1 IC02 DE26-20144A TRANS-L.V;DN-5574W,CE-5574W 120V 60HZ AC 1 LVT1 DE30-20016A BUZZER;CBE2220BA STICK 1 BUZ1 DE39-60001A WIRE-SO COPPER;PI0.6 SN T 52MM 25 J01~25 DE60-60012A PIN-EYELET;ID2.1 OD2.5 L3.0 SN BSP T0.25 8 DE61-90164A HOLDER-DIGITRON;NYLON#66 T1.8 BLK MW4370 1*

8-2 P.C.B Parts List

P.C.B Diagrams

9. Schematic Diagrams

9-1 Schematic Diagrams

9-1

VARISTOR

L.V.TRANS

LAMP

MAIN RELAY

POWER RELAY

(SECONDARY INTERLOCK)

PRIMARY S/W

CAVITY

TCO

FAN

MOTOR

D/MOTOR

MONITOR SWITCH

H. V. TRANS

H. V. CAPACITOR

H. V. DIODE

F FA

MAGNETRON

POWER CORD AC 120V/60Hz

(N)

(L)

BLK

BLU

BLK

BLKBLKBLK

BLK

YEL

WHT

1. INPUT : 120V 60HZ

2. DOOR : OPEN

3. LAMP : ON

4. : P.C.B PATTERN

5. : P.C.B IN/OUT POINT

WHT : WHITE BLK : BLACK YEL : YELLOW BLU : BLUE ORG : ORANGE G : GREEN

MGT TCO

COM

120V

130V 40W

21V

FM DM

ASSY CHOKE P.C.B

FUSE

WHT

GND

0.9mH

500K

2200pF2200pF

BLK BLK

BLK

WHT

BLK BLU ORG

COM

ORGNO

COM

WHT

COM

DOOR SENSING SWITCH

INTERLOCK MONITOR SWITCH

PRIMARY INTERLOCK SWITCH

(CON1)

RED

ORG

WHT

BLK

MAGNETRON

HIGH VOLTAGE DIODE

TO CHASSIS

FA F

HIGH VOLTAGE TRANSFORMER

HIGH VOLTAGE CAPACITOR

BLK

RED

ORG WHT

SYMBOL COLOR

BLU

BLK

RED

ORANGE

WHITE

BLUE

BLACK

Samsung Electronics

SAMSUNG MR5481GXAA Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual