1. Precaution

MATSUI

MICROWAVE OVEN

M263G

SERVICE Manual

MICROWAVE OVEN

Power Level

240

Defrost

400

120

560

800W

Grill

Combi

Cook Time

60

50

40

30

20

10

9

0

1

Drinks

2

3

4

Soup/

Sauce

5

6

8

7

Fresh

Vegetables

GRILL

OPEN DOOR

1. Precaution

CONTENTS

2. Specifications

3. Operating Instructions

4. Disassembly and Reassembly

5. Alignment and Adjustments

6. Troubleshooting

7. Exploded Views and Parts List

8. Wiring Diagrams

CURRY

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 immediatly.

4. Notify the Central Service Center if the microwave leakage exceeds 5 mW/cm 2

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/cm 2 ,

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 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.

1-1

Pretaution

1-2 Special Servicing Precautions (Continued)

17. When checking the continuity of the witches or transformer, always make sure that the power is OFF, and one of the lead wires is disconnected.

18. Components that are critical for safety are indicated in the circuit diagram by shading, or .

19. Use replacement components that have the same ratings, especially for flame resistance and dielectric strength specifications. A replacement part that does not have the same safety characteristics as the original might create shock, fire or other hazards.

1-3 Special High Voltage Precautions

1. High Voltage Warning

Do not attempt to 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.

Fig. 1-1. Discharging the High Voltage Capacitor

1-2

2. Specifications

2-1 Table of Specifications

POWER SOURCE

POWER CONSUMPTION

OUTPUT POWER

OPERATING FREQUENCY

TIMER

COOLING METHOD

MAGNETRON

OUTSIDE DIMENSIONS

OVEN CAVITY DIMENSIONS

SHIPPING WEIGHT

M263G

230V 50Hz, AC

MICROWAVE : 1,350W

GRILL : 1,000W

FROM 120W TO 800W (6 LEVEL POWER)

(IEC-705 TEST PROCEDURE)

2450MHz

60 MINUTES

AIR COOLING

OM75S(31)ESS

489(W) x 361(D) x 275(H)mm

306(W) x 322(D) x181(H)mm

APPROX. 16.5 Kg

2-1

3. Operating Instructions

3-1 Control Panel

DFROST REHEAT

Power Level

240

Defrost

400

560

800W

120

Grill

Combi

Cook Time

0

60

50

40

30

20

10

9

1

Drinks

2

3

4

Soup/

Sauce

5

6

7

8

Fresh

Vegetables

INSTANT COOK

OPEN DOOR

3-1

Operating Instruction

3-2 Features & External Views

Door Latches

Door

Ventilation Holes Heater

Glass Plate

Metal Rack

Guide Ring

Light

Safety Interlock Holes

Power Level

240

Defrost

400

120

560

800W

Grill

Combi

Cook Time

60

50

0

1

Drinks

2

3

Soup/

Sauce

4

5

40

30

20

10

9

6

7

8

Fresh

Vegetables

OPEN DOOR

Control Panel

Open Door Push Button

Power Level

240

Defrost

120

400

560

800W

Grill

Combi

Cook Time

60

50

40

30

20

0

1

Drinks

2

3

Soup/

Sauce

4

10

9

5

6

7

8 Fresh

Vegetables

GRILL

OPEN DOOR

356.5mm

489mm

3-3 Checking That Your Oven is Operating Correctly

NOTE: The oven must be plugged into an appropriate wall socket.

The glass plate must be in position in the ovn.

1. Open the oven door by pushing the OPEN DOOR button. Place a glass of water on the glass plate.

Close the door.

2. Set the power level to 100(maximum) by turning

COOKING POWER CONTROL knob.

3. Set the time to 4 to 5 minutes by turing TIMER knob.

Important: If any problem is experienced in the operation of the oven, please refer to the section on page 4 "what to do if you are in doubt or have a problem."

3-2

203mm

361mm

Operating Instruction

3-4 Variable Power Cooking Chart

POWER LEVEL

%

HIGH 100%

MEDIUM HIGH 70%

MEDIUM

LOW WEDIUM

50%

30%

DEFROST

LOW

GRILL

20%

15%

-

3-5 Adjusting the Cooking Time During Cooking

Adding Extra Time Stopping the Cooking

To stop the cooking....

Press....

Temporarily Open Door.

To resume cooking, close the door.

Completely Turn the TIMER knob to 'O'

MWO

800W

OUTPUT

GRILL

-

560W

400W

240W

160W

-

-

120W

-

-

-

1000W

Simply move the timer knob to any increased setting that you require.

3-6 Manual Defrosting Food

1. Place the frozen food in the oven and close the door.

2. Turn the COOKING POWER CONTROL knob to Defrost symbol.

3. Turn the TIMER knob to select appropriate time.

Result: Defrosting begins.

When Defrosting has finished, the oven beeps.

Power Level

Defrost

240

400

120

560

800W

Grill

Combi

3-7 Instant Cook Guide

1. Place the food in the oven and close the door.

2. Turn the COOKING POWER CONTROL knob to Max Power.

3. Turn the TIMER knob to select instant cook, drinks, soup/sauce and fresh vegetables.

Recipes Serving Size Power level Standing Time

Drink 150ml

100% 2~3mins.

Soup/

Sauce

200~300 ml

Fresh

Vegetables

200~300 g

100%

100%

2~3mins

2~3mins

3-3

4. Disassembly & Reassembly

4-1 Replacement of Magnetron, Motor Assembly and Lamp

Remove the magnetron including the shield case, permanent magnet, choke coils andF capacitors

(all of which are contained in one assembly).

Lamp

Thermo S/W

Fan Motor

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.

Magnetron

H. V. Trans H. V. Capacitor

Screw

4-2 Replacement of High Voltage Transformer

1. Discharge the high voltage capacitor.

2. Disconnect all the leads from the high voltage transformer.

3. Remove the mounting bolts on the high voltage transformer.

4. When replacing, connect the leads correctly and firmly.

Screws

H. V. Trans

4-1

Disassembly & Reassembly

4-3 Replacement of Door Assembly

4-3-1 Removal of Door Assembly

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

4-3-2 Removal of Door "C"

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.

Hinge Lower

Screw

Hinge Upper

4-3-3 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.

4-3-4 Removal of Key Door & Spring

Remove pin hinge from Door "E"

Detach spring from Door "E" and key door.

4-2

Door "E"

Door Key

Spring Key

Disassembly &ReaAssembly

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.

4-4 Replacement of Fuse

1. Disconnect the oven from the power source.

2. Remove the 10A fuse in the fuse holder.

3. When replacing the 10A fuse, be sure to use an exact replacement part. If new 10A 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.

4-5 Drive Motor Replacement

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.

4-6 Ceramic Heater Replacement

1. Take out the outer panel.

2. Disconnect the connectors from the heater ceramic and wire leade.

3. Remove two(3) screws securing the bracket upper to the oven cavity.

4. Remove one screw securing the bracket heater.

Bracket

Upper

Screw

Screw

Drive Motor

Screw

Bracket

Heater

Ceramic

Heater

4-3

5. Alignment and Adjustments

PRECAUTION

1. High voltage is present at the high voltage terminal of the high voltage transformer during any cook cycle.

2. It is neither necessary nor advisable to attempt measurement of the high voltage.

3. Before touching any oven components, or wiring, always unplug the oven from its power source and discharge the high voltage capacitor.

5-1 High Voltage Transformer

1. Remove connectors from the transformer terminals and check continuity.

Filament Terminals

2. Normal resistance readings should be as follows:

Secondary ..........................Approx. 123

Filament .............................Approx. 0

Primary...............................Approx. 2.15

Primary

Terminals

(Room temperature = 20˚C)

Secondary Terminal

5-2 Magnetron

1. Continuity checks can only indicate 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.

Magnetron Antenna

4. A continuity check between each filament terminal and the magnetron case should read "open".

Cooling Fins

Gasket Plate

5-1

Alignment and Adjustments

5-3 High Voltage Capacitor

1. Check continuity of the capacitor with meter set at the highest ohm scale.

2. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates 9M

Ω.

3. A shorted capacitor will show continuous continuity.

4. An open capacitor will show constant 9M

Ω.

5. Resistance between each terminal and chassis should read infinite.

5-4 High Voltage Diode

1. Isolate the diode from the circuit by disconnecting its leads.

2. With the ohm-meter set at the highest resistance scale, measure the resistance 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

Ω in the other direction.

5-5 Adjustment of Primary Switch, Door Sensing Switch and Monitor Switch

Precaution

For continued protection against radiation hazard, replace parts in accordance with the wiring diagram and be sure to use the correct part number for the following switches.: Primary and secondary interlock switches and the interlock monitor switch all together. Then follow the adjustment procedures below. After repair and adjustment, be sure to check the continuity of all interlock switches and the interlock monitor switch.

1. When mounting Primary switch and

Interlock Monitor switch to Latch Body, consult the figure below.

Primary Interlock Switch

2. NOTE: No specific adjustment during installation of Primary switch and Monitor switch to the latch body is necessary.

Interlock

Monitor

Switch

3. When mounting the Latch Body to the oven assembly, adjust to the Latch Body by moving it so that the oven door will not have any play. 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.

Body Latch

Lever Switch

Secondary

Switch

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.

-

Primary switch

Monitor switch (COM-NC)

Monitor switch (COM-NO)

Secondary switch

Door Open

0

Door Closed

0

0

0

5-2

Alignment and Adjustments

5-6 Output Power of Magnetron

CAUTION

MICROWAVE RADIATION

PERSONNEL SHOULD NOT ALLOW EXPOSWRE TO MICROWAVE RADIATION FROM MICROWAVE GENERATOR OR

OTHER PARTS CONDUCTING MICROWAVE ENERGY.

The output power of the magnetron can be measured by performing a water temperature rise test.

Equipment needed

*

Two 1-liter cylindrical borosilicate glass vessel (Outside diameter of 190mm)

* 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 one liter of water.

2. Stir water in glass vessel with thermometer and record glass vessel's temperature as T1. (10

±

1ûC)

3. After moving the water into another glass vessel, place it on the center of the cooking tray. Set the oven to high power and operate for 54 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 rise as T2.

5. Subtract R1 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

52.3

T

52.3 : Heating Time (sec)

* Output (W) = 100 x

T

4.187 : Coefficient for Water

1000 : Water (cc)

T : Temperature Rise (T2-T1)

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 E) by a power factor of 91 in case of centigrade temperature.

5-7 Microwave Heat Distribution - Heat Evenness

The microwave heat distribution can be checked indirectly by measuring the water temperature risen 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 it 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 and start heating.

5. After heating for 2 minutes, measure the temperatures of water in each beaker.

6. Microwave heat distribution rate can be caicviated as follows :

D

D

Beaker

D/4

D/4

Minimum

Temperature Rise

D/4

Heat Distribution = X 100(%)

D/4

Cooking Tray

Maximum

Temperature Rise

The result should exceed 65%.

5-3

Alignment and Adjustments

5-8 Procedure for Measurement of Microwave Energy 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

Power Level

Defrost

120

240

Cook Time

60

50

40

30

20

10

400

0

9

GRILL

OPEN DOOR

1

Drinks

2

8

560

Grill

7

3

4

Soup/

Sauce

6

800W

Combi

5

Fresh

Vegetables 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 4mW/cm 2 , after repair or adjustment.

Maximum allowable leakage is 5mW/cm

2

.

4mW/cm

2

is used to allow for measurement and meter accuracy

5-9 Check for Microwave Leakage

1. Remove the outer panel.

2. Pour 275±15cc of 20±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 4mW/cm 2 .

5-10 Note on Measurement

1) Do not exceed the limited scale.

2) The test probe must be held on the grip of the handle, otherwise a false reading may result when the operator's hand is between the handle and the probe.

3) When high leakage is suspected, do not move the probe horizontally along the oven surface; this may cause damage to the probe.

4) Follow the recommendation of the manufacturer of the microwave energy survey meter.

5-11 Leakage Measuring Procedure

5-13-1 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

2 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

5-13-2 At least once a year have the microwave energy survey meter checked for accuracy by its manufacturer.

5-4

6. Troubleshooting

WARNING FOR HIGH VOLTAGE

4000 VOLTS EXIST AT THE HIGH VOLTAGE AREA. DO NOT OPERATE THE OVEN WITH CABINET PARTS REMOVED. DO NOT

REMOVE THE CABINET PARTS IF THE POWER SUPPLY CORD IS PLUGGED IN THE WALL OUTLET. UNPLUG THE POWER CORD

BEFORE SERVICING.

6-1 Electrical Malfunction

Parts

Fuse blows out when door is opened.

Fuse is open.

Oven lamp does not light.

Fan does not operate.

Cause

Defective primary interlock switch ary winding.

Defective interlock monitor switch

Layer short of the secondary coil of

H. V. Transformer

1) Fuse blown out

2) Poor contact of power cord

3) Defective lamp

4) Defective timer contacts

5) Thermal cutout

S/W open

1) Defective fan motor.

2) Defective contacts of timer

Diagnosis Remedy

Check continuity of the primary switch terminals with Replace the primary wire removed using a multimeter. If there is continuity interlock switch between switch terminals when door is opened, the switch is defective.

Replace the interlock monitor switch

Check continuity of the monitor switch terminals with wire removed by using a multimeter.

If there is continuity between switch terminals when the door is closed, the switch is defective.

The fuse will not blow right away, but if it blows in a few seconds, then there is a layer short.

If the fuse blows with H. V. Trans secondary open, the transformer may be faulty.

Replace H. V. Transformer

Check fuse.

Check continuity of power supply cord. Also check whether the power cord is securely wired.

The fan motor rotates, but lamp does not light.

Check the terminals of timer for continuity, turning the timer knob ON and OFF repeatedly.

In this case the oven lamp and fan do not turn on

Replace the fuse.

Adjust or replace the power supply cord.

Replace the lamp.

Replace the timer.

Replace the thermal cutout S/W

Replace the motor.

If 230V is found at motor terminals, the motor should be replaced.

The oven lamp does not light and fan motor does not operate.

Replace the timer.

NOTE: Interlock monitor switch must be replaced when the fuse is blown out.

6-1

Troubleshooting

6-1 Electrical Malfunction (Continved)

Parts Cause

1) Too small a load

Microwave turns off during cooking cycle.

2) Defective magnetron thermal cutout S/W

Incomplete qrounding

Electric shock is felt.

Door does not operate properly

Timer does not operate.

Cooking tray does not rotate.

1) Broken door hinges

2) Missing or loose screw

1) Defective timer motor

2) Defective contacts of timer S/W

1) Defective drive motor

1) Blocking of the ventilatior

Diagnosis

If a small amount of food is heated for a long time, period of microwave may turn off during operation.

Check to see if the magnetron thermal cutout switch is activated at a temperature higher than 150˚C.

Make sure that qrounding of the power supply cord has been done properly.

Remove the cabinet for inspection.

Check the door hinge.

Check if the screws are secured well to the door hinge.

If the timer does not operate with 230V applied to the terminals, the timer motor amy be faulty.

The lamp does not light.

Check to see if 21V exists at the motor terminals.

If so, motor will be defective.

Check if the air inlet or outlet ventilation is blocked by the wall or other objects.

Magnetron thermal cutout switch

OFF

2) Defective fan motor

3) Too small a load or no load

If the fan motor does not operate with 230V applied to the terminal, the motor may be faulty.

If a small amount of food is heated repeatedly over a long period of time, microwave turns off during operation.

Remedy

To increase the oven load, add a glass of water into the oven.

Replace thermal cutout switch.

Rewire.

Replace door hinges.

Fasten or tighten.

Replace timer.

Replace timer

Replace drive motor.

Keep a distance of

100mm from the wall or the objects.

Replace fan motor.

To increase the oven load, place a glass of water into the oven.

6-2

Troubleshooting

6-2 Unsatisfactory Cooking

Parts

-

Cause

1) Open cathode of magnetron

2) Defective

H. V. Diode

Food is not heated.

3) Shorted magnetron

4) Defective magnetron

5) Poor contact of primay interlock switch

6) Open coil of

H. V. Transformer

7) Shorted H. V.

capacitor

8) Monitor fuse blown out

Diagnosis

Check the terminals with a multimeter to see if the heater circuit is open.

Check the H. V. Diode for continuity in the reverse and normal directions using megger. If there is continuity in the reverse direction, the H. V. Diode may be faulty.

(In this event H. V. Capacitor will be hot)

Connect megger leads to quick-connect terminal & body of the magnetron if there is continuity, the magnetron may be faulty. (In this case the main fuse will be blown)

If there is a crack in the magnetron antenna (dome), the magnetron is defective.

Check if the screws are secured well to the door hinge.

and pressing it ON and OFF repeatedly.

Check the continuity of primary coil and secondary coil. If there is no continuity, H. V. Transformer is defective.

Check the continuity of capacitor.

If the capacitor shorts, the fuse blows

Check the monitor fuse

(on the noise filter)

Remedy

Replace magnetron.

Replace H. V. Diode.

Replace magnetron.

Replace magnetron.

Replace or adjust.

Replace the

H. V. Transformer.

Replace the

H. V. Capacitor.

Replace the

Monitor fuse

6-3 Part Check List

Symptom Related Parts

Microwave cooking does not work.

H.V.Transformer

H.V.Capacitor

H.V.Diode

Fan motor does not rotate.

Fan motor

Check Points Remedy

1) Check if the primary and secondary coil is open or shorted.

* Resistance of primary coil: Approx. 2.15

Resistance of secondary coil: Approx. 123

2) Check if the MGT Heater Voltage is approx. 3.3V AC.

Caution : High voltage !

Replace.

Check continuity of capacitor between two terminals with H.V.wire lead removed.

The resistance should be approx. 10M

, it's failure.

Replace.

1) If there is no continuity in forward, direction the H.V.Diode is open.

Replace.

2) If there is continuity in reverse direction, it's shorted.

Check if the motor coil is open.

Replace.

6-3

7. Exploded Views and Parts List

7-1 Main Exploded View

M36

M39

M40

M3

M32

M13

D4

D5

M2

M6

D3

M7

M1

M34

D8

D2

D1

M35

M14

M28

M20

M4

M19

M5

D6

D7

M18

M38

M16 M21

M29

M28

M30

C4

C5

M33

C6

M31

M17

M9

B4

M25

B2

B1

B3

M10

M26

M27

M22

M24

M15

M23

M12

M37

C3

C1

C2

C7

M8

7-1

Exploded Views and Parts List

7-2 Main Parts List

Ref. No.

Parts No.

M 1

M 2

M 3

M 4

M 5

M 6

M 7

DE74-20017A

DE92-90441B

DE70-30116B

DE61-80005A

DE61-80004A

DE92-40170S

DE39-40749A

M 8 DE93-30365J

M 9 DE66-90013A

M 10 DE93-20001A

M 12 DE71-60010A

M 13 DE67-60002A

M 14 DE47-20161A

M 15 4713-001031

M 16 DE47-20018A

M 17 DE03-30029A

M 18 DE39-20075A

M 19 DE47-70030D

M 20 DE61-50401A

M 21 DE91-40095A

M 22 DE31-30031A

M 23 DE91-70063A

M 24 DE91-70061B

M 25 DE61-50106A

M 26 2501-001011

M 27 DE26-10107B

M 28 DE47-20050A

M 29 DE71-60011A

M 30 DE80-10003A

M 31 DE61-40017A

M 32 DE71-60298B

M 33 DE31-10154A

M 34 DE74-70071B

M 35 DE39-30097B

M 36 DE61-50323B

M 37 DE27-10020A

M 38 DE63-90035G

M 39 DE62-90101A

M 40 DE65-20012A

Description/Specification

TRAY-COOKING;GLASS(NEOREX/RE-31),T6,OD288

ASSY-GUIDE ROLLER;G645C,D16.5

PANEL-OUTER;SECC,T0.6,W351.7,L1014.7,WHT-C

HINGE-UPPER;SCP1,T2.3,ZN-COATIN,M745

HINGE-LOWER;SCP1,T2.3,ZN-COATING,M745

ASSY DOOR;M263G(G633C),WHT,CURRY

WIRE HARNESS-A;230V50Hz,M263G,MATSUI

ASSY CONTROL-BOX;M263G(G633C),CURRY

LEVER-DOOR;POM(F20-01),NTR,MW5630T

ASSY BODY LATCH;2ND-W1,M97G45/M9745

COVER-AIR;PP(TB53),T1.7,WHT,64G,M745

COUPLER;PPS,5GR,BRN,M97G45

THERMOSTAT;PW2N(120/110)187Z23.,250V/7.5A

LAMP-INCANDESCENT;230V,173mA,40W,ORG,-,-,25x69mm

THERMOSTAT;PW-2N(150/60,187Y,30,250V/7.5A

MAGNETRON;OM75SH(31)ESS

ASSY POWER CORD;UD13A1,240V16A,L1500,0.75MM

HEATER-CERAMIC;115V,490W,26OHM,6

BRACKET-HEATER;ALSTER,T0.5,60,70,M67G45

ASSY NOISE FILTER;SN-E10D(N),250V,10A,2ND-WD-TYP

FAN-MOTOR;SMF745EA,230V/50HZ,ASSY-FAN-MO

ASSY-HVD;V2M6,PI9.0,0.05MT

ASSY-H.V.FUSE;THV060T-0750-H,5KV0.75A,RED

BRACKET-HVC;SECC,T0.8,W31,L125.8

C-OIL;910nF,2100V,BK,54x35x75mm,20mm

TRANS-H.V;SHV-745EC1-1,240V,2300V/3.40V

THERMOSTAT;PW-2N,130/60

COVER-MGT;PP,T2.0,WHT,M745

BASE-PLATE;SGCC1-Z,T0.8,W340,L550,M745

FOOT;PP(A353),BLK,MW5630T

COVER-BACK;COVER+LABEL,-,-,-,-,CE745G/G64

MOTOR-DRIVE;M2HJ49ZR02,ST-16,21V

RACK-WIRE;MSWR3,PI3,PI230,HI80,SNC2

WIRE LEAD-G;L100,MBQ45,GRILL

BRACKET-UPPER;ALSTER,T0.6,W385,L205,G643C

COIL-MC CHOKE;TC,101

CUSHION-RUBBER;DFA20,T2,W190,L100,BLK

ADIABATIC-UPPER;S/FINE INSULATION,T5.0,W162,L2

CORD CLAMP;DALC-2-1,SILICON

: Warning

: Option Parts

Q'ty Remarks

1

1

2

1

1

1

1

1

1

1

1

1

1

1

1 PN/OUT

1 BKT/UP

1 ADIA-U

1

1

1

1

1

1

1

1

1

1

1

1

2

2

1

1

1

1

1

1 GRILL

1 CV/AIR

1 MGT

: Electrostatically Sensitive Devices

7-2

7-3 Assembly Door Parts List

Ref. No

D1

D2

D3

D4

D5

D6

D7

D8

Parts No.

DE01-00003A

DE64-40008B

DE64-40252N

DE67-20158C

DE02-00125A

DE64-40006A

DE61-70033A

DE92-50126D

Description / Specification

FILM-DOOR;PE-FILM,T0.15,W142,L262,M745

DOOR-C;PP,T1.5,BLK,CE745G

DOOR-A;ABS-HR0370,WHT(W9501),-,-,M263

SCREEN-DOOR;ACRYL,T1.5,W372.5,L197.8,WHT,M

TAPE-DOUBLE FACE;ACRYL,T0.45,W9,WHT,WF103,#4420

DOOR-KEY;POM(TC3005),T2.0,12GR,BLK,CE94

SPRING-KEY;ES,HSWR10,PI0.6,D6.0,L22.3,BLU

ASSY DOOR-E;M745,-,BLK,ASSY PURCHASING

Exploded Views and Parts List

Q'ty Remarks

1

1

1

1

0.6

DOOR/A

1

1

1

7-4 Assembly Control Box Parts List

Ref. No Parts No.

C 1 DE66-20171A

C 2 DE61-70076A

C 3 DE64-10122C

C 4 DE72-70165J

C 5 DE45-10075A

C 6 3501-000309

C 7 DE39-40545A

C 8 DE93-30586A

Description / Specification

BUTTON-PUSH;ABS,WHT,G643C

SPRING-BUTTON;HSWR,PI0.6

KNOB;ABS-HR0370,5g,WHT,PMS3272C(GRN

CONTROL-PANEL;ABS,WHT(W9501),-,-,M263G(G633C

TIMER-ASSY;TMFF60MTN1,220/240V,240-GRILL-

RELAY-POWER;240V,3750VA,15A,-,6mS,20mS

WIRE HARNESS-B;230V50HZ,G635C

ASSY CONTROL-PANEL;240V50Hz,M263G,PURE-WHT,CURRY

Q'ty Remarks

1

1

1

1

1

1

2

1

7-5 Assembly Body Latch Parts List

Ref. No

B 1

B 2

B 3

B 4

Parts No.

Description / Specification

DE66-90001A LEVER-SWITCH;P.O.M(F20-02) 2 6 NTR 2ND-W

3405-000178 SWITCH-MICRO;250V,15A, 200gf, SPST-NO

3405-000175 SWITCH-MICRO;250V,15A, 200gf, SPST-NO

DE66-40001A LATCH-BODY;POM(F20-02) 40GR NTR

Q'ty

1

2

1

1

Remarks

7-3

7-6 Standard Parts List

Parts No.

DE60-10012A

DE60-10012A

DE60-10059A

DE60-10080A

DE60-10080A

DE60-10082H

DE60-10082H

DE60-10082H

DE60-10082H

DE60-10082H

DE60-10082H

DE60-10082H

DE60-10082H

DE60-10082J

DE60-10098A

DE60-10098A

DE60-10098A

DE60-20063A

DE60-20063A

DE60-10012A

DE60-10033A

DE60-10069A

Description / Specification

SCREW-TAP TITE;TH,+,3,M4,L10,SWR10,ZPC2,TOOTH

SCREW-TAP TITE;TH,+,3,M4,L10,SWR10,ZPC2,TOOTH

SCREW-TAP TH;TH,M4,L8,SUS410,CR

SCREW-WASHER;M5,L12,2S

SCREW-WASHER;M5,L12,2S

SCREW-A;2S-4X12,TOOTHED

SCREW-A;2S-4X12,TOOTHED

SCREW-A;2S-4X12,TOOTHED

SCREW-A;2S-4X12,TOOTHED

SCREW-A;2S-4X12,TOOTHED

SCREW-A;2S-4X12,TOOTHED

SCREW-A;2S-4X12,TOOTHED

SCREW-A;2S-4X12,TOOTHED

SCREW-TAPPING;TH,2S-4X8,MSWR3,ZPC,YEL,WS

SCREW-ASSY TAP TITE;PH,TC,M4X8,SWRCH18A,ZPC2,GLD,W

SCREW-ASSY TAP TITE;PH,TC,M4X8,SWRCH18A,ZPC2,GLD,W

SCREW-ASSY TAP TITE;PH,TC,M4X8,SWRCH18A,ZPC2,GLD,W

BOLT-FLANGE;M4,10,ZPC3,YEL,MSWR

BOLT-FLANGE;M4,10,ZPC3,YEL,MSWR

SCREW-TAP TITE;TH,+,3,M4,L10,SWR10,ZPC2,TOOTH

SCREW-TH;TH,+,M4,L10,MSWR10,FEFZY

SCREW-TAP TH;TH,M4,L10,FRFZY

Exploded Views and Parts List

Q'ty Remarks

N/FILTER

P-C-EA”

B/HEAT

HVT

MGT

B-PLTE

B/UPP

BD-LAT

CN-BOX

COVER-B

CV/AIR

MO/FAN

PN/OUT

CORD-C

HVD-EARTH

M/DRIV

MG-TCO

HI-LOW

HI-UPP

-

P/RELA

1

2

4

1

1

2

2

2

2

2

4

2

2

4

1

1

2

1

2

2

1

4

7-4

8. Schematic Diagram

Wiring Diagram

230V~

50Hz

N

BLU

BRN

L

V/G

E

NOTE

ASSY CHOKE P.C.B

DOOR IS OPEND

S/W1

S/W2

S/W3

MWO MODE

1mH

S/W1

BLU

CAVITY

TCO

L

WHT

DM

BLU

TIMER

SWITCH

BLK

21V

0V

FM

RED

RED

TM

BLU

BLU

WHT 230V

ORG

BRN

WHT

E

BRN

SECONDARY S/W

BLU

INRUSH

RELAY

BLU

RESISTOR

YEL

H.V.T

0V

YEL

BRN

MGT

TCO

ORG

BRN

PRIMARY

SWITCH

S/W1

S/W2

BRN

S/W3

FUNCTION ROTARY

BRN

COIL

BRN

ORG

NC

COM

MONITOR

SWITCH

NO

ORG

BRN

H.V.D

H.V.FUSE

(0.75A)

H.V.C (0.95uF)

F

MAGNETRON

FA

S/W2

S/W3

CYCEL MODE

S/W1

S/W2

S/W3

GRILL MODE

PRIMARY

LATCH

SWITCH

SECONDARY

LATCH

SWITCH

MONITOR

SWITCH

SYMBOL COLOR

BRN

BLU

ORG

RED

WHT

BLK

YEL

GRN

Y/G

BROWN

BLUE

ORANGE

RED

WHITE

BLACK

YELLOW

GREEN

YELLOW/GREEN

High Voltage Circuit

MAGNETRON

BRN

BLU

RED

FA F

ORG

HIGH VOLTAGE

DIODE

HIGH VOLTAGE CAPACITOR

TO CHASSIS

RED

RED

H.V.FUSE

SYMBOL COLOR

ORG ORANGE

BRN BROWN

BLK BLACK

RED RED

BLU BLUE

HIGH VOLTAGE

TRANSFORMER

8-1

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