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
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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
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
SCREW
SCREW
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