Samsung CE979GSE User manual

MICROWAVE OVEN

CE979GSE

SERVICE

Manual

MICROWAVE OVEN CONTENTS

1. Precautions

2. Specifications

3. Operating Instructions

4. Disassembly and Reassembly

5. Alignment and Adjustments

6. Circuit Description

7. Troubleshooting

8. Exploded Views and Parts List

9. PCB Diagrams

10. Schematic Diagrams

TAWIL

1. Precaution

1-1 Safety precautions ( )

Samsung Electronics 1-1

1. All repairs should be done in accordance

with the procedures described in this

manual. This product complies with

Federal Performance Standard 21 CFR

Subchapter J (DHHS).

2. Microwave emission check should be

performed to prior to servicing if the oven is

operative.

3. If the oven operates with the door open :

Instruct the user not to operate the oven and

contact the manufacturer and the center for

devices and radiological health immediatly.

4. Notify the Central Service Center if the

microwave leakage exceeds 5 mW/cm2

5. Check all grounds.

6. Do not power the MWO from a "2-prong"

AC cord. Be sure that all of the built-in

protective devices are replaced. Restore any

missing protective shields.

7. When reinstalling the chassis and its

assemblies, be sure to restore all protective

devices, including: nonmetallic control

knobs and compartment covers.

8. Make sure that there are no cabinet openings

through which people--particularly

children--might insert objects and contact

dangerous voltages. Examples: Lamp hole,

ventilation slots.

9. Inform the manufacturer of any oven found

to have emmission in excess of 5 mW/cm2,

Make repairs to bring the unit into

compliance at no cost to owner and try to

determine cause.

Instruct owner not to use oven until it has

been brought into compliance.

CENTRAL SERVICE CENTER

10. Service technicians should remove their

watches while repairing an MWO.

11. To avoid any possible radiation hazard,

replace parts in accordance with the wiring

diagram. Also, use only the exact

replacements for the following parts:

Primary and secondary interlock switches,

interlock monitor switch.

12. If the fuse is blown by the Interlock Monitor

Switch: Replace all of the following at the

same time: Primary 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 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

for about 30 seconds after disconnection.

Short the negative terminal of the high-

voltage capacitor to to the oven chassis.

(Use a screwdriver.)

3. High voltage is maintained within specified

limits by close-tolerance, safety-related

components and adjustments. If the high

voltage exceeds the specified limits, check

each of the special components.

1-2

Pretaution

Samsung Electronics

1-2 Special Servicing Precautions (Continued)

1-3 Special High Voltage Precautions

Fig. 1-1. Discharging the High Voltage Capacitor

2. Specifications

2-1 Table of Specifications

Samsung Electronics 2-1

TIMER 99Mins

POWER SOURCE 230V 50Hz, AC

POWER CONSUMPTION MICROWAVE : 1,500W

MAX : 1,500W

GRILL : 1,300W

OUTPUT POWER FROM 85W TO 850W (10 LEVEL POWER)

(IEC-705 TEST PROCEDURE)

OPERATING FREQUENCY 2,450MHz

MAGNETRON OM75PH(31)ESS

COOLING METHOD COOLING FAN MOTOR

OUTSIDE DIMENSIONS 517(W) x 340H) x 435(D)

POWER LEVEL

%CE979GSE

10% 85W 4 sec 26 sec

20% 170W 7 sec 23 sec

30% 255W 10 sec 20 sec

40% 340W 13 sec 17 sec

50% 425W 16 sec 14 sec

60% 510W 19 sec 11 sec

70% 595W 22 sec 8 sec

80% 680W 25 sec 5 sec

90% 765W 28 sec 2 sec

100% 850W 30 sec 0 sec

ON TIME OFF TIME

2-2 Comparison Chart

MODEL

FEATURE

MORE/LESS O

AUTO COOK/DISH O

AUTO DEFROST O

AUTO REHEAT O

TIME COOK O

POWER LEVEL O

GRILL O

MICROWAVE/GRILL O

CE979GSE

Cehcop Cehcop

deodorization

GRILL / COMBI

START

1 Min

STOP / CANCEL

3. Operating Instructions

3-1 Control Panel

Samsung Electronics 3-1

3-2 Features & External Views

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

,,,,,,,,,,,,,,,

DOOR LATCHES

DOOR

LIGHT HEATER DISPLAY

CONTROL

PANEL

INHALATION

SLOT

GUIDE

ROLLER

VENTILATION

HOLES

GLASS TRAY

SAFETY

INTERLOCK

HOLES

1. Remove five screws from the rear section.

2. Lift the outer panel by pulling it backwaeds

1. The magnetron incudes the shield case,

permanent magnet, check coils and 500pF

capacitors (all contained in one assembly).

2. Discharge the high voltage capacitor.

(See page1-2)

3. Disconnect all lead wires from the magnetron.

4. Remove screw(1) securing the magnetron

supporter.

5. Remove the magnetron supporter.

6. Remove the air cover

7. Remove screws(2) securing the thermal cutout

switch.

8. Remove screws securing the magnetron to the

wave guide.

9. Remove the magnetron very carefully.

10. Remove screws from the back panel to take

out fan motor.

11. When removing the magnetron, make sure

that its antenna does not hit any adjacent

parts.

12. When replacing the magnetron, be sure to

remount the magnetron gasket in the correct

position, and make sure the gasket is in good

condition.

4. Disassembly and Reassembly

4-1 Removal of Outer Panel

Samsung Electronics 4-1

4-2 Replacement of Magnetron and Fan Motor

Screw(1) Screw(2)

Cover Air

Magnetron Fan Motor

4-3 Replacement of High Voltage Transformer

4-4 Replacement of Door Assembly

4-2 Samsung Electronics

1. Discharge the high voltage capacitor.

(See page 1-2)

2. Disconnect all the leads.

3. Remove four screws.

4. When replacing, connect the leads securely.

1. Remove bolts securing the upper hinge and

lower hinge, then remove the door assmbly.

2. After replacing the door, check the operation

of the primary interlock switch, the secondary

interlock switch and the interlock monitor

switch.

3. Microwave emission should not exceed

5§ /§† (All service adjustments should be

made for minimum RF emission.)

Disassembly and Reassembly

H.V.TRANS H.V.FUSE

HINGE UPPER

HINGE VOLT

H.V.CAPACITOR

4-5 Replacement of Lamp

Samsung Electronics 4-3

1. Disconnect harness-"A" assembly.

2. Remove screw securing the lamp cover

1. Remove the glass tray and assembly from

cavity.

2. Turn the oven upside down.

3. Remove screws securing the elevation motor

cover.

4. Disconnect all lead wires from the elevation

motor.

5. Remove screws securing the elevation motor

to the cavity.

6. Remove the elevation motor.

7. When replacing the elevation motor, be sure

to remount it in the correct position.

8. Reconnect all the leads to the elevation motor.

9. Screw the elevation motor cover to the base

plate with screw driver.

10. Remount the coupler in the correct position.

4-6 Replacement of Elevation Motor

Disassembly and Reassembly

ELEVATION MOTOR COVER

Lamp cover

Screw

ELEVATION

MOTOR TANTABLE

MOTOR

WEIGHT SENSOR

SCREW

1. Remove the outer panel.

2. Disconnect all the connectors and terminals on

the heater and noise filter assembly.

3. Unscrew nuts securing the grill heater.

1. Disconnect all lead wires from the interlock

monitor switch and the door sensing switch.

2. Push up the mounting tabs.

3. Make necessary adjustments Do the microwave

emission check according to "ALIGNMENT

AND ADJUSTMENTS" on page 5-2(whenever

they any repaired or replaced).

1. Disconnect all lead wires from the primary

interlock switch.

2. Push up the mounting tabs which support the

primary interlock switch.

3. Make necessary adjustments and microwave

emision check according to "ALIGNMENT

AND ADJUSTMENTS" on page 5-2(whenever

they are repaired or replaced).

4-7 Replacement of Grill Heater

4-8 Replacement of Interlock Monitor Switch and Door Sensing Switch

4-9 Replacement of Primay Interlock Switch

4-4 Samsung Electronics

Disassembly and Reassembly

Interlock Switch Replacement

When replacing defective switches, be sure to

check that the mointing tabs are not bent or

broken.

GRILL

HEATER

SCREW

PLATE SRRING

BRACKET HEATER

Primary Interlock S/W

Lever Switch

Interlock Monitor S/W

Door Sensing S/W

Body Latch

Guide S/W

1. Disconnect the oven from the power source.

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

3. When replacing the 10A fuse, use an exact

replacement and check the primary interlock ,

door sensing and interlock monitor switches.

4. When the above switches operate properly,

check that the control circuit transformer is not

defective.

1. Be sure to disclyarge any static electricity from

your body, and avoid touching the "Touch

control" clrcuitry.

2. Disconnect the connectors from the control

circuit board.

3. Remove screws ¥L and ¥Msecuring the control

circuit bord.

4. Lift up the control circuit board from right side

and remove the hooks holding the contol

circuit board to the box assembly.

1. Disconnect all lead wires from the gas sensor

and the thermostat.

2. Remove screws securing the air guide.

4-10 Replacement of Fuse

Samsung Electronics 4-5

4-11 Replacement of Control Circuit Board

4-12 Replacement of Gas Sensor and ThermoSwitch

Disassembly and Reassembly

Screw¥L Screw¥M

Gas sensor

thermostat

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