Samsung CE2827NR Service Manual

MICROWAVE OVEN

CE2827NR

Manual

SERVICE

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

SRSC

9. Schematic Diagrams

PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY

(a) Do not operate or allow the oven to be

operated with the door open.

(b) Make the following safety checks on

all ovens to be serviced before activating
the magnetron or other microwave
source, and make repairs as necessary:
(1) Interlock operation,
(2)properdoorclosing,
(3) seal and sealing surfaces (arcing,

wear, and other damage),

(4) damage to or loosening of hinges

and latches,

(5) evidence of dropping or abuse.

(c) Before turning on microwave power

for any service test or inspection within
the microwave generating
compartments, check the magnetron,
wave guide or transmission line, and
cavity for proper alignment, integrity,
and connections.

(d) Any defective or misadjusted

components in the interlock, monitor,
door seal, and microwave generation
and transmission systems shall be
repaired, replaced, or adjusted by
procedures described in this manual
beforetheovenisreleasedtothe
owner.

(e) A Microwave leakage check to verify

compliance with the Federal
performance standard should be
performed on each oven prior to
release to the owner.

1. Precaution

Follow these special safety precautions. Although the microwave oven is completely safe during ordinary use,
repair work can be extremely hazardous due to possible exposure to microwave radiation, as well as potentially
lethal high voltages and currents.

1-1 Safety precautions ( )

1. All repairs should be done in accordance
with the procedures described in this
manual. This product complies with
Federal Performance Standard 21 CFR
Subchapter J(DHHS).

2. Microwave emission check should be
performed to prior to servicing if the oven is
operative.

3. If the oven operates with the door open :
Instruct the user not to operate the oven and
contact the manufacturer and the center for
devices and radiological health immediately.

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

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. 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.

CENTRAL SERVICE CENTER

10. Service technicians should remove their
watches while repairing an MWO.

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 -

1-2 Special Servicing Precautions (Continued)

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

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

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

1-3 Special High Voltage Precautions

1. High Voltage Warning

Do not attempt to measure any of the high
voltages --this includes the filament voltage
of the magnetron. High voltage is present
during any cook cycle.
Before touching any components or wiring,
always unplug the oven and discharge the
high voltage capacitor (See Figure 1-1)

2. The high-voltage capacitor remains charged

about 30 seconds after disconnection. Short
he 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.

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.

H. V. Capacitor

H. V. Diode

Short

Touch chassis ground first then short to the high
voltage capacitor terminal by using screwdriver or
jumper wire.

Fig. 1-1 Discharging High Voltage Capacitor

PRECAUTION

Never touch any circuit wiring with your hand
nor with uninsulated tool during operation.

PRECAUTION

Servicemen should remove their watches
whenever working close to or replacing the
magnetron.

- 2 -

2. Specifications

2-1 Table of Specifications

TIMER

POWER SOURCE

POWER CONSUMPTION

OUTPUT POWER

OPERATING FREQUENCY

MAGNETRON

COOLING METHOD

OUTSIDE DIMENSIONS

OVEN DIMENSIONS

CAVITY DIMENSIONS

60 MINUTES

230V 50Hz, AC

MICROWAVE : 1,300W

GRILL : 1100W

COMBI : 2400W

FROM 100 TO 850W

(IEC-705 TEST PROCEDURE)

2,450MHz

OM75P(31)ESS

COOLING FAN MOTOR

489(W) x 275(H) x 415(D)

330(W) x 211(H) x 329(D)

557(W) x 329(H) x 451(D)

SHIPPING WEIGHT APPROX.

NET 15.0 kg

CROSS 16.5 kg

- 3 -

3. Operating Instructions

3-1 Control Panel

3-2 Features & External Views

DOOR LATCHES

VENTILATION HOLES

HANDLE

TURNTABLE

DOOR

342mm

489mm

COUPLER

GRILL

ROLLER RING

m
m

5
7
2

LIGHT

METAL RACK

SAFETY INTERLOCK HOLES

206mm

397mm

- 4 -

4. Disassembly and Reassembly

4-1 Replacement of Magnetron, Motor Assembly and Lamp

Remove the magnetron including the shield case, permanent magnet, choke coils and capacitors (all of
whicharecontainedinoneassembly).

1. Disconnect all lead wires from the magnetron and lamp.

2. Remove a screw securing air cover.

3. Remove the air cover.

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

5. Take out the magnetron very carefully.

6. Remove nuts from the back panel.

7. Take out the fan motor.

8. Remove the oven lamp by rotating to pull out from hole of air cover.

NOTE1: When removing the magnetron, make sure that its antenna does not hit any adjacent

parts, or it may be damaged.

NOTE2: When replacing the magnetron, be sure to remount the magnetron gasket in the correct

positionandmakesurethegasketisingoodcondition.

4-2 Replacement of High Voltage Transformer

1. Discharge the high voltage capacitor.

2. Disconnect all the leads.

3. Remove the mounting bolts.

4. Reconnect the leads correctly and firmly.

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.

Servicemen should remove their watches whenever
working close to or replacing the magnetron.

PRECAUTION

PRECAUTION

- 5 -

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.

Upper Hinge

SCREWS

4-3-2 Removal of Door "C"

Insert flat screwdriver into the gap between Door
"A" and Door "C" to remove Door "C". Be careful
when handling Door "C" because it is fragile.
Then remove the door assembly.

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.

- Insertion depth of the thin metal plate should be

0.5mm or less.

SCREW

Lower Hinge

Door "E"

4-3-4 Removal of Key Door & Spring

Remove pin hinge from Door "E"
Detach spring from Door "E" and key door.

- 6 -

Door "E"

Key Door

Spring

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. When 10A fuse blows out by the operation of interlock monitor switch failure, replace the primary interlock
switch, door sensing switch, monitor switch and power relay.

3. When the above three switches operate properly, check if any other part such as the control circuit board,
blower motor or high voltage transformer is defective.

4-5 Replacement of Drive Motor

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

2.Turntheovenupsidedowntoreplacethedrivemotor.

3. Remove a screw securing the drive motor cover.

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

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

6. Remove the drive motor.

7. When replacing the drive motor, be sure to
remount it in the correct position.

8. Connect all the leads to the drive motor.

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

10. Remount the coupler in the correct position.

- 7 -

Screw

Drive Motor

Base Plate

Drive Motor Cover

4-6 Replacement of Control Circuit Board

4-6-1 Removal of Control Box Assembly

1. Be sure to ground any static electric charge in
your body and never touch the control circuit.

2. Disconnect the connectors from the control
circuit board.

3. Remove screws securing the control box
assembly.

4. Remove the screw securing the ground tail of
the keyboard.

CONTROL-BOX

4-6-2 Removal of Ass'y P.C.B Assembly

1. Remove screws securing the control circuit
board.

SCREWS

2. Lift up the control circuit board from the Ass'y
control box.

ASSY PCB

SCREWS

- 8 -

5. Alignment and Adjustments

PRECAUTION

1. High voltage is present at the high voltage terminals during any cook cycle.

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

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

5-1 High Voltage Transformer

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

2. Normal resistance readings are as follows:

Filament Terminals

Secondary

Filament

Primary

(Room temperature = 20°C)

Approx. 121

Approx. 0

Approx. 1.7







5-2 Low Voltage Transformer

1.Thelowvoltagetransformerislocatedonthe
control circuit board.

2. Remove the low voltage transformer from the
PCB Ass'y and check continuity.

3. Normal resistor reading is shown in the table.

5-3 Magnetron

1. Continuity checks can indicate only an open
filament or a shorted magnetron. To diagnose an
open filament or shorted magnetron :

2. Isolate the magnetron from the circuit by
disconnecting its leads.

3. A continuity check across the magnetron filament
terminals should indicate one ohm or less.

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

Primary
Terminals

Magnetron Antenna

Secondary
Terminal

Gasket Plate

- 9 -

Cooling Fins

5-4 High Voltage Capacitor

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

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

3. A shorted capacitor will show continuous continuity.

4. An open capacitor will show constant 9M.

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

5-5 High Voltage Diode

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

2. With the ohm-meter set at the highest resistance scale, measure across the diode terminals. Reverse the
meter leads and read the resistance. A meter with 6V, 9V or higher voltage batteries should be used to
check the front-to back resistance of the diode (otherwise an infinite resistance may be read in both
directions). The resistance of a normal diode will be infinite in one direction and several hundred Kin the
other direction.

5-6 Main Relay and Power Control Relay

1. The relays are located on the PCB Ass'y. Isolate them from the main circuit by disconnecting the leads.

2. Operate the microwave oven with a water load in the oven. Set the power level set to high.

3. Check continuity between terminals of the relays after the start pad is pressed.

5-7 Adjustment of Primary Switch, Door Sensing Switch and Monitor Switch

Precaution

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

1. When mounting Primary switch and Interlock
Monitor switch to Latch Body, consult the figure.

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

Primary Interlock Switch

3. When mounting the Latch Body to the oven
assembly, adjust the Latch Body by moving it so
that the oven door will not have any play in it.
Check for play in the door by pulling the door
assembly. Make sure that the latch keys move
smoothly after adjustment is completed.
Completely tighten the screws holding the Latch
Body to the oven assembly.

4. Reconnect to Monitor switch and check the
continuity of the monitor circuit and all latch
switches again by following the components test
procedures.

5. Confirm that the gap between the switch
housingandtheswitchactuatorisnomorethan

0.5mm when door is closed.

6.

Interlock Switch Replacement

replacing faulty switches, be sure switch mounting
tabs are not bent, broken or otherwise deficient in
their ability to secure the switches in place.

- When

Body Latch

Primary switch

Monitor switch(COM-NC)

Monitor switch (COM-NO)

Door Sensing S/W

Interlock
Monitor
Switch

Lever Door(B)

Door Sensing
Switch

Door Open Door Closed

∞

0

∞

∞

0

∞

0

0

- 10 -

5-8 Output Power of Magnetron

e

e

e

e

e

e

e

e

CAUTION

MICROWAVE RADIATION

PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE
GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.

The output power of the magnetron can be measured by performing a water temperature rise test.
Equipment needed :
* Two 1-liter cylindrical borosilicate glass vessel (Outside diameter 190 mm)
* One glass thermometer with mercury column
NOTE: Check line voltage under load. Low voltage will lower the magnetron output. Make all temperature

and time tests with accurate equipment.

1. Fill the one liter glass vessel with water.

2. Stir water in glass vessel with thermometer, and record glass vessel's temperature ("T1", 10±1°C).

3. After moving the water into another glass vessel, place it in the center of the cooking tray. Set the oven to
high power and operate for 52seconds exactly. (3 seconds included as a holding time of magnetron
oscillation:)

4. When heating is finished, stir the water again with the thermometer and measure the temperature ("T2").

5. Subtract T1 from T2. This will give you the water temperature rise. (T)

6. The output power is obtained by the following formula;

Output Power = 4.187 x 1000 xT+0.55xMcx(T

) 52:HeatingTime(sec)

2-T0

49 49 : Counting Time (sec)

4.187 : Coefficient for Water
1000 : Water (cc)



T : Temperature Rise (T1-T2)
To : Room Temperature
Mc : Cylindrical borosilicate glass weight

7. Normal temperature rise for this model is 9° C to 11° C at 'HIGH'.
NOTE 1: Variations or errors in the test procedure will cause a variance in the temperature rise.
Additional power test should be made if temperature rise is marginal.
NOTE 2: Output power in watts is computed by multiplying the temperature rise (step 5) by a factor of 91
times the of centigrade temperature.

5-9 Microwave Heat Distribution - Heat Evenness

The microwave heat distribution can be checked indirectly by measuring the water temperature rise at
certain positions in the oven:

1. Prepare five beakers made of 'Pyrex', having 100 milliliters capacity each.

2. Measure exactly 100milliliters off water load with a measuring cylinder, and pour into each beaker.

3. Measure the temperature of each water load. (Readings shall be taken to the first place of decimals.)

4. Put each beaker in place on the cooking tray as illustrated in figure below. Start heating.

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

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

D

D

D

D

D

D

D

D

Beak

Beak

Beak

Beak

Beak

Beak

Beak

Minimum

Heat Distribution = Temperature Rise X 100(%)

D

D

D

D

D

D

D

D

Beak

Maximum

The result should exceed 65%.

Temperature Rise

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

Cooking Tray

Cooking Tray

Cooking Tray

Cooking Tray

Cooking Tray

Cooking Tray

Cooking Tray

Cooking Tray

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

D/4

- 11 -

5-10 Procedure for Measurement of Microwave Energy Leakage

1) Pour 275±15cc of 20±5°C(68±9°F) water in a beaker
which is graduated to 600cc, and place the beaker in
the center of the oven.

2) Start to operate the oven and measure the leakage by
using a microwave energy survey meter.

3) Set survey meter with dual ranges to 2,450MHz.

4) When measuring the leakage, always use the 2 inch
spacer cone with the probe. Hold the probe
perpendicular to the cabinet door. Place the spacer
cone of the probe on the door and/or cabinet door
seam and move along the seam, the door viewing
window and the exhaust openings moving the
probe in a clockwise direction at a rate of 1 inch/sec. If the leakage testing of the cabinet door seam is
taken near a corner of the door, keep the probe perpendicular to the areas making sure that the probe end
at the base of the cone does not get closer than 5cm to any metal. If it gets closer than 5cm, erroneous
readings may result.

5) Measured leakage must be less than 4mW/cm

2

, after repair or adjustment.

Maximum allowable leakage is 5mW/cm2.
4mW/cm

2

is used to allow for measurement and meter accuracy

5-11 Check for Microwave Leakage

1. Remove the outer panel.

2. Pour 275±15cc of 20±5°C(68±9°F) water in a beaker
which is graduated to 600cc, and place the beaker in
the center of the oven.

3. Start the oven at the highest power level.

4. Set survey meter dual ranges to 2,450MHz.

5. Using the survey meter and spacer cone as described
above, measure near the opening of magnetron, the
surface of the air guide and the surface of the wave
guide as shown in the following photo.( but avoid the
high voltage components.) The reading should be less than 4mW/cm

2

.

5-12 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.

5-13 Leakage Measuring Procedure

5-13-1 Record keeping and notification after measurement

1) After adjustment and repair of a radiation preventing device, make a repair record for the measured
values, and keep the data.

2) If the radiation leakage is more than 4mW/cm
functioning properly and the identical parts are replaced as listed in this manual notify 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.

2

after determining that all parts are in good condition,

- 12 -

6. Troubleshooting

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.
Fuse is OK.
No display and no operation at all
.

No display and no operation at all.
Fuse is blown.

Oven does not accept

key input (Program)

Timer starts countdown but no
microwave oscillation.
(No heat while oven lamp and fan
motor turn on.)

1. Open or loose lead wire harness

2. Open thermal cutout (Magnetron)

3. Open low voltage transformer

4. Defective Ass'y PCB

1. Shorted lead wire harness

2. Defective primary latch switch
(NOTE 1)

3. Defective monitor switch (NOTE1)

4. Shorted H.V.Capacitor

5. Shorted H.V.Transformer (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 H.V.Transformer is replaced, check diode and

magnetron also.

1. Key input is not in-Sequence

2. Open or loose connection of
membrane key pad to Ass'y PCB

3. Shorted or open membrane panel

4. Defective Ass'y PCB

1. Off-alignment of latch switches

2. Open or loose connection of high
voltage circuit especially
magnetron filament circuit

NOTE: Large contact resistance will

bring lower magnetron
filament voltage and cause
magnetron to lower output
and/or intermittent oscillation.

3. Defective high voltage
components H.V.Transformer H.V.
Capacitor H.V.Diode, 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

Check fan motor when thermal
cutout is defective.
Check Ass'y PCB when L.V.T is
defective.

Check adjustment of primary,
interlock monitor,
power relay, door sensing switch.

Refer to operation procedure.

Replace PCB main.

Adjust door and latch switches.

Check high voltage component
according to
component test procedure and
replace if it is
defective.

Replace PCB main.

- 13 -

6-1 Electrical Maltunction(continved)

SYMPTOM CAUSE CORRECTIONS

Oven lamp and fan motor turn on 1. Misadjustment or loose wiring

of primary latch switch

2. Defective primary latch switch

Oven can program but timer
does not start.

Microwave output is low;.
Oven takes longer time to
cook food.

Fan motor turns on when plugged in Loose wiring of door sensing switch

Oven does not operate and return to
the plugged in mode.

Loud buzzing noise can be heard. 1. Loose fan and fan motor

Turntable motor does not rotate. 1. Open or loose wiring of

Oven stops operation during cooking

Sparks 1. Metallic ware or cooking dishes

Uneven cooking

Noise from the turntable motor when
it starts to operate.

1. Open or loose wiring of
secondary interlock switch

2. Off-alignment of primary
interlock

3.

Defective secondary interlock S/W

1. Decrease in power source
voltage.

2. Open or loose wiring of
magnetron filament circuit.
(Intermittent oscillation))

3. Aging of magnetron

Defective Ass'y PCB Replace PCB main.

2. Loose screws on
H.V.Transformer

3. Shorted H.V.Diode

turntable motor.

2. Defective turntable motor.

1. Open or loose wiring of primary
interlock switch

2. Operation of thermal
cutout(Magnetron)

touching on the oven wall.

2. Ceramic ware trimmed with
gold or silver powder also
causes sparks.

Uneven intensity of microwave due
to its characteristics.

Noise may result from the motor. Replace turntable motor.

Adjust door and latch switches.

Adjust door and interlock
switches.

Consult electrician.

Check wire of door sensing
switch.

Tighten screws of fan motor.
Tighten screws of
H.V.Transformer.
Replace H.V.Diode.

Replace turntable motor.

Adjust door and latch switches.

Inform the customer.
Do not use any type of cookware
with
metallic trimming.

Wrap thinner parts of the food
with aluminum foil.
Use plastic wrap or cover with a
lid.
Stir once or twice while cooking
foods such as soup, cocoa, or
milk.

- 14 -

7. Exploded Views and Parts List

7-1 Exploded Views

MM03

MD14

MD02

MD03

MD19

MC03

MC06

MD08

MD09

MD191

MD04

CUSHION-GUIDE

MC13

MD10

MD24

MC23

MC24

MD06

MC11

MC09

MD07

MC07

MC01

MD05

MD01

MC26

MM16

MM172

MM28

MM01

MM67

MM22

MM14

MM109

MB01

MB05

MM62

MM171

MM29

MM07

MM61

MM55

MB03

MM68

MM10

MB02

MB041

MB042

MM30

MM25

MM60

MM06

MM57

MM05

MM26

MM09

MM59

MM21

MM63

MM17

MM08

MM88

MM64

MM18

MM19

MM20

- 15 -

MM27

MM32

MM31

7-2 Main Parts List

No. Code No. Description Specification Q'ty Remark

MB01 DE96-00120B ASSY BODY LATCH M1717N,NC2000(HANDLE) 1

MB02 3405-000175 SWITCH-MICRO 250V,15A,200gf,SPST-NO 1

MB03 3405-000178 SWITCH-MICRO 250V,15A,200gf,SPST-NO 2

MB041 DE66-00093A LEVER-SWITCH(A) NC2000,PP-TH53,-,-,-,-,NTR,HANDLE 1

MB042 DE66-00094A LEVER-SWITCH(B) NC2000,PP-TH53,-,-,-,-,NTR,HANDLE 1

MB05 DE72-00137A BODY-LATCH NC2000(0.6/0.8/1.2),PP,-,-,-,-,WHT,- 1

MM01 DE70-00184P PANEL-OUTER MW850WA,C/STEEL,T0.5,-,P/WHT,NC2-0.8CU.FT 1

MM03 DE39-00162B WIRE HARNESS-A CE2727N,-,230V50HZ,-,-,-,-,NC2000 1

MM05 DE96-00010A ASSY NOISE FILTER SN-3WED,250V10A,3W NO-INRUSH TC,- 1

MM06 DE96-00031A ASSY-MOTOR FAN SMF-3RDEA,230V50HZ,2400RPM,M1733,- 1

MM07 DE39-20058C ASSY POWER CORD KKP-4819D/B232,250V16A,L1700,G 1

MM08 OM75P(31)ESS ASSY-MAGNETRON:OM75P 1

MM09 DE71-60457B COVER-AIR 3RD-0.7(BTM),PP,-,-,-,-,-,- 1

MM10 4713-001031 LAMP-INCANDESCENT 230V,173mA,40W,ORG,-,-,25x69mm 1 CV/AIR

MM109 DE74-80062A STOPPER-HEATER 3RD-W,SECC,T0.8xW70xL70,-,-,-,- 1

MM14 DE26-00014B TRANS-H.V SHV-175ECR,230V,50HZ,2290V/3.45V,-,-,H,- 1

MM16 DE71-00159A COVER-CEILING CN2835,MICA SHEET,T0.3,W114,L56,-,- 1

MM17 DE47-20009A THERMOSTAT PW2N-520PB,160/60,250V/7.5A,H, 1 MG-TCO

MM171 DE47-00002B THERMOSTAT PW2N,-,-,100,110,-,-,-,187H,30.0 1 GRL-TCO

MM172 DE47-20010A THERMOSTAT PW-2N(120/60)187Y,250V7.5A,120 1 CAV-TCO

MM18 DE74-20102D TRAY-COOKING GLASS,T6,-,890g 1

MM19 DE97-00193B ASSY-GUIDE ROLLER NC2000 0.6,T2*P1198(14PI),-,- 1

MM20 DE67-00140A COUPLER NC2000(0.6~0.8),PPS(ESS840),-,3G,BRN,NEW 1

MM21 DE39-40409A WIRE HARNESS-E 230V50HZ,M9G45,CTW,-,-,- 1 H/EART

MM22 DE31-10154A MOTOR-SYNCHRONOUS M2HJ49ZR02,ST-16,50/60HZ,- 1

MM25 DE65-20014A CABLE CLAMP -,-,-,NY-66,-,DA-6N 1 P-CORD

MM26 DE71-00148A COVER-BLOWER MW850WA,PP,T1.5,-,-,-,NTR,NC2000(0.8CUFT) 1

MM27 DE61-40066A FOOT -,PP,-,BLK,-,-,- 2

MM28 DE80-00023B BASE-PLATE CE2877N,SGCC1,T0.6,-,-,NC2000,0.8CUFT 1

MM29 2501-001016 C-OIL 950nF,2.1KV,BK,35x54x80,20mm 1

MM30 DE61-00139A BRACKET-HVC NC2000,SECC,T0.8,-,-,-,0.6/0.8/1.2CUFT 1

MM31 DE59-00002A DIODE-H.V ESJC13-12B,12KV,-,-,-,MWO ALL,- 1

MM32 DE91-70061B ASSY-H.V.FUSE THV060T-0750-H,5KV/0.75A,RED 1

MM55 3601-000448 FUSE-CARTRIDGE 250V,10A,SLOW-BLOW,CERAMIC,6.35x31.8mm 1

MM57 DE61-50576A BRACKET-HEATER -,STS430,T0.5,W70,L70,-,- 1

MM59 DE71-60451A COVER-BACK 3RD-0.7,SECC,T0.5,W115,L332,-,-,- 1

MM60 DE63-20017A GASKET-HEATER -,BRASS,T1.5,OD30.5,ID22.5,-,-,- 1

MM61 DE47-00004A HEATER-GRILL SHG-2733E,-,-,1100W(1080W),-,230V,-,-,-,FNG 1

MM62 DE61-70060A SPRING-PLATE -,SK-5,T0.5,T0.5,-,-,-,-,-,-,- 1

MM63 DE61-30008A SUPPORTER-HEATER -,ALUMINA,T12,CE745G,-,-,- 1

MM64 DE74-70071D RACK-WIRE MSWR10,PI3,0.7/NC2000,D230,H85,-,- 1 CE2827N

MM64 DE97-00106A ASSY-WIRE RACK CE2719T,CURSTY-TRAY,-,-,- 1 CE2827NT

MM67 DE61-00143A BRACKET-UPPER MW850WA,SECC,T0.5,-,-,-,NC2000(0.8CUFT) 1

MM68 6031-001424 WASHER-PLAIN PTFE,-,ID22.2,OD28,T1.7,WHT 1

MM88 DE73-90027B FERRITE RU65(RU15*28.6*6.5),-,M2L(FE2O3+Ni+Zn) ,-,-,- 1

- 16 -

7-3 Control & Door Parts List

No. Code No. Description Specification Q'ty Remark

MC01 - ASSY CONTROL-BOX -,CE2827NR/BWT,P/WHT,-,CIS 1 S.N.A

MC03 DE72-00322A CONTROL-PANEL CE2827NR/BWT,ABS,-,-,-,-,P/WHT,- 1

MC06 DE64-00095A WINDOW-DISPLAY SAN,-,M1727/M1927,- 1

MC07 RC-EASY3R-05 ASSY PCB PARTS CE2727N,230V50Hz 1

MC09 DE64-00097B KNOB-POWER CE2727/CE2927,ABS,-,-,-,-,-,-,POWER 1

MC11 DE64-00096A KNOB-TIMER M1727/M1927,ABS,-,-,-,-,-,-,- 1

MC13 DE94-00547A ASSY CONTROL-PANEL 230V50HZ,CE2827NR/BWT,P/WHT,- 1

MC23 DE64-00100A BUTTON-CLOCK M1727/M1927,ABS,-,-,-,CLOCK 1

MC24 DE64-00113A KNOB-CAP M1727/M1927,ABS,-,-,-,-,C-BLUE,-,- 1

MC26 DE97-00165B ASSY-KNOB POWER CE2727,POSERKJEONG,WHT+BLU,- 1

MD01 DE94-00311F ASSY DOOR M1727R,CE2727R/BWT,PURE-WHT,CIS 1

MD02 DE64-00092F DOOR-A CE2727R/BWT,ABS,-,-,-,PURE-WHT,-,CTP 1

MD03 DE63-00017A SCREEN-DOOR SAN,-,-,-,SMOG,M1727/M1777,- 1

MD04 DE94-00351D ASSY DOOR-E(COATING) CE2877N/XEC,COATING/2ND,NC2000(0.8CUFT) 1

MD05 DE64-00221D FILM-DOOR -,-,T0.15,W264*L143,-,-,-,NC08(GRILL) 1

MD06 DE64-40008B DOOR-C -,PP,CE745G,-,-,-,BLK,- 1

MD07 DE61-00198A SPRING-KEY M1877,HSWR,D6,-,-,23 1/4,23 1/4,T0.7,BLUING,- 1

MD08 DE61-00145A HINGE-UPPER NC2000(GRILL),SCP,T2.0,-,-,ZPC3,-,- 1

MD09 DE61-00146A HINGE-LOWER NC2000,SCP,T2.0,-,-,ZPC3,-,GRILL 1

MD10 DE64-00211A DOOR-KEY NC2000(0.6/0.8/1.2),PP,-,BLK,-,-,HANDLE-TYPE 1

MD14 DE64-00099C HANDLE-DOOR M1927/M1727,ABS,-,-,-,-,P/WHT,- 1

MD14 DE64-00099C HANDLE-DOOR

MD19 DE64-00093D HANDLE-RING(A) M1927/M1727,ABS(HR0370),-,-,-,-,P/WHT,- 1

MD191 DE64-00094D HANDLE-RING(B) M1927/M1727,ABS(HR0370),-,-,-,-,P/WHT,- 1

MD24 DE94-00311J ASSY DOOR-A M1727/XEE,WHT,SESAB

S.N.A : SERVICE NOT ASSEMBLY

1

1

- 17 -

7-4 Standard Parts List

Code No. Description Specification Q'ty Remark

DE60-10012A SCREW-TAP TITE -,SWR10,M4,L10,TH,+,-,3,ZPC2,- 1 N/FILTER

DE60-10012A SCREW-TAP TITE -,SWR10,M4,L10,TH,+,-,3,ZPC2,- 1 P-CORD

DE60-10018A SCREW-ASSY MACHINE -,WS,MSWR10,SN1,PH,M4X0.7P,-,8,-,- 2 BKT-HEATER

DE60-10063A SCREW-TAP TH -,-,FEFN,-,TH,M4,-,L12,-,- 1 P/OUTER

DE60-10080B SCREW-WASHER -,2S,SWRCH18A,ZP2,PH,PI5,-,L10,-,- 4 HVT

DE60-10080B SCREW-WASHER -,2S,SWRCH18A,ZP2,PH,PI5,-,L10,-,- 4 MGT

DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 2 B-LATCH

DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 3 B-PLATE

DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 1 BKT-UPPER

DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 1 C-BLOWER

DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 1 CON-BOX

DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 1 COVER-AIR

DE60-10082H SCREW-A -,-,-,-,2S-4X12,TOOTHED,-,-,-,- 4 OUT-PANEL

DE60-10098A SCREW-ASSY TAP TITE -,GLD,SWRCH18A,ZPC2,PH,TC,-,M4X8,WT,- 1 BOTT-TCO

DE60-10098A SCREW-ASSY TAP TITE -,GLD,SWRCH18A,ZPC2,PH,TC,-,M4X8,WT,- 1 CVT-TCO

DE60-10098A SCREW-ASSY TAP TITE -,GLD,SWRCH18A,ZPC2,PH,TC,-,M4X8,WT,- 1 D-MOTOR

DE60-10098A SCREW-ASSY TAP TITE -,GLD,SWRCH18A,ZPC2,PH,TC,-,M4X8,WT,- 2 MGT-TCO

DE60-10195A SCREW-STAR POLE -,SWCH18A,4,12,TH,*,-,2,ZNC,- 2 C-BACK

DE60-20063A BOLT-FLANGE M4,10,ZPC3,YEL,MSWR,-,-,-,- 2 H/LOWER

DE60-20063A BOLT-FLANGE M4,10,ZPC3,YEL,MSWR,-,-,-,- 2 H/UPPER

DE60-30016A NUT-FLANGE M4,MSWR10,-,-,-,-,-,-,- 2 F-MOTOR

DE60-10088A SCREW-TAP PH -,-,FEFZY,PLAIN,PH,M3,-,L8,-,- 5

DE60-10069A SCREW-TAP TH -,-,FRFZY,-,TH,M4,-,L10,-,- 2

DE60-10012A SCREW-TAP TITE -,SWR10,M4,L10,TH,+,-,3,ZPC2,- 1 B/COVER

DE60-10098A SCREW-ASSY TAP TITE -,GLD,SWRCH18A,ZPC2,PH,TC,-,M4X8,WT,- 1

- 18 -

8. P.C.B Diagrams

- 19 -

8-1 P.C.B Diagrams

8-2 P.C.B Parts List

Code No. Description Specification Q'ty Remark

3501-001062 RELAY-POWER 24VDC,523.2mW,16A,1FormA,15mS, 1 RY03

3501-001068 RELAY-POWER 24Vdc,523mW,16A,1FormA,15mS,10 1 RY04

3501-001155 RELAY-MINIATURE 24VDC,200MW,3000MA,1FORMA,10MS,10MS 2 RY01,02

3601-001126 FUSE-CARTRIDGE 250V,1.6A,FAST-ACTING,CERAMIC,5x20mm 1 FUSE1

DE07-00020A LED DISPLAY CSQ-4244G-21(L),30seg,5digit,45.2*22.3*27.9,- 1 LED1

DE09-00208A IC MICOM S3C7054DG6-SOT4,SM-200111-AA,CE2727N,- 1 IC01

DE26-00034A TRANS-L.V SLV-1933EN,230V,50Hz,7.0V/17V,-,35*11,PIN,- 1 LVT1

DE30-20016A BUZZER CBE2220BA,STICK,-,-,-,-,-,-,- 1 BUZ1

DE34-00041A SW-ENCODER 28VDC,10mA,ENDLESS,-,JES1424G 1 ECD1

DE34-00054A SWITCH-PRESSURE 28VDC,10mA,11-STEP,-,JES1411G 1 ECD2

DE47-40024A HOLDER-FUSE FH-51H,7.5A,-,-,-,-,- 1 FUSE1

DE92-00633A ASSY PCB AUTO 230V50Hz,LED,RC-EASY3R-00,CE2727 1

0401-001083 DIODE-SWITCHING MM4148,100V,150MA,LL-34,TP 10 D07~16

0402-001103 DIODE-RECTIFIER 1T4,400V,1A,TS-1,TP 6 D01~06

0403-001288 DIODE-ZENER ZMM55C5V1,4.8-5.4V,500MW,LL-34,TP 1 ZD01

0501-000465 TR-SMALL SIGNAL MMBT3904,NPN,350mW,SOT-23,TP,100-300 1 TR03

0504-001008 TR-DIGITAL RN2427,PNP,200MW,2.2K/10K,SOT-23,TP 7 TR06~12

0504-001080 TR-DIGITAL KRC246S,NPN,200mW,2.2K/10K,SOT-23,TP 6 TR01,02,04,05,13,14

1202-000141 IC-VOLTAGE COMP. 7033,SOT-89,3P,-,SINGLE,0V,-,P 1 IC 03

1203-001037 IC-VOLTAGE REGULATOR 78L05,SOT-89,3P,185MIL,PLASTIC 1 IC02

1404-000230 THERMISTOR-PTC 27ohm,20%,-,265V,1.5A,360mA,BK 1 PTC1

2007-000293 R-CHIP 100OHM,5%,1/8W,DA,TP,3216 7 R18~24

2007-000300 R-CHIP 10KOHM,5%,1/10W,DA,TP,2012 8 R02,05,11,13~17

2007-000468 R-CHIP 1KOHM,5%,1/10W,DA,TP,2012 4 R03,04,08,09

2007-000671 R-CHIP 2KOHM,5%,1/10W,DA,TP,2012 3 R01,06,07

2007-000931 R-CHIP 470OHM,5%,1/10W,DA,TP,2012 1 R10

2007-000941 R-CHIP 47KOHM,5%,1/10W,DA,TP,2012 1 R12

2203-000444 C-CERAMIC,CHIP 1nF,10%,50V,X7R,TP,2012,- 1 C12

2203-000555 C-CERAMIC,CHIP 0.02nF,5%,50V,NP0,TP,2012 2 C10,11

2203-001608 C-CERAMIC,CHIP 22nF,+80-20%,50V,Y5V,TP,2012 5 C07~09,14,15

2401-000151 C-AL 1000uF,20%,25V,GP,TP,10x20,5 1 C02

2401-000244 C-AL 100uF,20%,10V,GP,TP,6.3x7,5 1 C03

2401-000911 C-AL 22uF,20%,16V,GP,TP,5x7,5 2 C04,06

2401-002075 C-AL 4.7uF,20%,50V,GP,TP,5x11,5 1 C05

2401-002598 C-AL 220uF,20%,50V,GP,TP,10x16,5 1 C01

2801-003214 CRYSTAL-UNIT 4.194304MHz,50ppm,28-AAA,12pF, 1 XTL1

3404-001129 SWITCH-TACT 12VDC,50mA,160gf,6.6x6.6x7mm,- 1 SW1

3711-000881 CONNECTOR-HEADER BOX,3P,1R,2.5mm,STRAIGHT,SN 1 CN02

3711-004200 CONNECTOR-HEADER BOX,5P/7P,1R,2.5MM,STRAIGHT,SN 1 CN01

DE39-60001A WIRE-SO COPPER PI0.6,SN,T,52MM,TAPING_WIRE,-, 7 J03~09

DE41-00172A PCB-MAIN RC-EASY3R-**,FR-1,1,T1.6*W330*L197,- 1

DE60-60012A PIN-EYELET ID2.1,OD2.5,L3.0,SN,BSP,T0.25, 2

- 20 -

9. Schematic Diagrams

S

9-1 Schematic Diagrams

CONDITION OF OVEN

DOOR IS OPENED
COOK OFF

WIRING COLOR

BRN : BROWN
WHT : WHITE
RED : RED
BLK : BLACK
Y/G : YELLOW GREEN

BLU : BLUE
ORG : ORANGE
YEL : YELLOW

1.INPUT : 230V

2.DOOR : OPEN

3.LAMP : ON

4. : P.C.B PATTERN

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

BLU

BLK

MAGNETRON

FA F

RED

HIGH VOLTAGE
TRANSFORMER

RED

HIGH VOLTAGE

DIODE

HIGH VOLTAGE CAPACITOR

RED

RED

SYMBOL

ORG
BRN
RED
BLK

H.V.FUSE

COLOR
ORANGE
BROWN
RED
BLACK

TO CHAS

- 21 -