Samsung CE935G User manual

2. Specifications
2-1 Table of Specifications
Samsung Electronics 2-1
MODEL CE935G
ITEM
TIMER 60 MINUTES
POWER SOURCE 230V/50HZ, AC
POWER CONSUMPTION MICROWAVE : 1,500W,GRILL : 1,300W
OUTPUT POWER FROM135W TO 900W (6 LEVEL POWER INCLUDING DEFROST)
(IEC-705 TEST PROCEDURE)
OPERATING FREQUENCY 2,450MHz
MAGNETRON OM75PH(31)
COOLING METHOD COOLING FAN MOTOR
OUTSIDE DIMENSIONS 517(W) x 298(H) x 385(D)
NET WEIGHT 20Kg.
SHIPPING WEIGHT 23Kg

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CE935G
3. Operating Instructions
3-1 Control Panel
Samsung Electronics 3-1
3-2 Features & External Views
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Door VentilationSlot Light SafetyInterlockHoles
ControlPanel
OpenDoorPushButton
GuideRoller
GRILLWIRE RACK
GlassPlate
DoorLatches
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CE935G
517mm
369mm
298mm
216.4mm
385mm
GRILL
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4. Disassembly and Reassembly
4-1 Replacement of Magnetron, Motor Assembly and Lamp
Samsung Electronics 4-1
Remove the magnetron including the shield case,
permanent magnet, choke coils and capacitors (all
of which are contained in one assembly).
1. Disconnect all lead wires from the magnetron
and lamp.
2. Remove the air cover.
3. Remove screws securing the magnetron to the
wave guide.
4. Take out the magnetron very carefully.
5. Remove screws from the back panel.
6.Remove the assy noise filter.
7. Take out the fan motor.
8. Remove the oven lamp by pulling out from hole
of air cover carefully.
NOTE1: When removing the magnetron, make
sure that its antenna does not hit any
adjacent parts, or it may be damaged.
NOTE2: When replacing the magnetron, be sure
to remount the magnetron gasket in
the correct position and make sure the
gasket is in good condition.
1. Discharge the high voltage capacitor.
2. Disconnect all the leads.
3. Remove the mounting bolts.
4. Reconnect the leads correctly and firmly.
4-2 Replacement of High Voltage Transformer
Lamp
Cover Air
Magnetron H. V. Trans
H. V. Capacitor
Screw
Thermo S/W
Fan Motor
H. V. Trans
Bolts
PRECAUTION
Servicemen should remov their watches whenever
working close to or replacing the magnetron.
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.

4-3 Replacement of Door Assembly
4-3-1 Removal of Door Assembly
4-2 Samsung Electronics
Remove screws securing the upper hinge and
lower hinge. Then remove the door assembly.
Insert flat screwdriver into the gap between Door
"A" and Door "C" to remove Door "C". Be careful
when handling Door "C" because it is fragile.
Following the procedure as shown in the figure,
insert and bend a thin metal plate between Door
"E" and Door "A" until you hear the 'tick' sound.
1. Insertion depth of the thin metal plate should be
0.5mm or less.
Remove pin hinge from Door "E"
Detach spring from Door "E" and key door.
4-3-2 Removal of Door "C"
4-3-3 Removal of Door "E"
Disassembly and Reassembly
Upper Hinge
Lower Hinge Screw
Screw
Door "C"
Door "A"
Door "E"
4-3-4 Removal of Key Door & Spring
Key Door Spring
Door "E"

4-3-5 Reassembly Test
Samsung Electronics 4-3
1. Disconnect the oven from the power source.
2. Remove the 10A fuse in the Noise filter.
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, Secondary switch and interlock
monitor switch.
4. When the above three switches operate properly,
check if any other part such as, blower motor or
high voltage transformer is defective.
1. Take out the glass tray and guide roller from the
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 and coupler.
7. When replacing the drive motor, be sure to
remount it in the correct position with the
coupler.
8. Connect all the leads to the drive motor.
9. Screw the drive motor cover to the base plate
with a screw driver.
4-4 Replacement of Fuse
4-5 Replacement of Drive Motor
Disassembly and Reassembly
Screw
Drive Motor Cover Base Plate
Thermo
Switch
Drive Motor
After replacement of the defective component parts of the door, reassemble it and follow the instructions below for proper
installation and adjustment so as to prevent an excessive microwave leakage.
1. When mounting the door to the oven, be sure to adjust the door parallel to the bottom line of the oven
face plate by moving the upper hinge and lower hinge in the direction necessary for proper alignment.
2. Adjust so that the door has no play between the inner door surface and oven front surface. If the door
assembly is not mounted properly, microwave energy may leak from the space between the door and
oven.
3. Do the microwave leakage test.

4-6 Replacement of Control Box Assembly
4-6-1 Removal of Control Box Assembly
4-4 Samsung Electronics
1. Disconnect the connectors from the control box
assembly.
2. Remove screws securing the control box
assembly.
3.Remove the knobs of the control box Ass'y.
4. Remove the screw securing the timer.
Disassembly and Reassembly
Control Box
Screw

Samsung Electronics
5. Alignment and Adjustments
5-1 High Voltage Transformer
5-2 Magnetron
5-1
1. Remove connectors from the transformer terminals
and check continuity.
2. Normal resistance readings are as follows:
(Room temperature = 20ûC)
1. Continuity checks can indicate only an open
filament or a shorted magnetron. To diagnose an
open filament or shorted magnetron :
2. Isolate the magnetron from the circuit by
disconnecting its leads.
3. A continuity check across the magnetron filament
terminals should indicate one ohm or less.
4. A continuity check between each filament terminal
and magnetron case should read open.
PRECAUTION
1. High voltage is present at the high voltage terminals during any cook cycle.
2. It is neither necessary nor advisable to attempt measurement of the high voltage.
3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the high voltage
capacitor.
Filament Terminals
Primary
Terminals
MODEL SHV-945EG1
Secondary 103.0Ω ¡10%
Filament Shows Continuity
Primary 1.6Ω ¡10%
Cooling Fins
Gasket Plate
Magnetron Antenna

Samsung Electronics
5-3 High Voltage Capacitor
5-4 High Voltage Diode
5-5 Adjustment of Primary Switch, Secondary Switch and Monitor Switch
5-2
1. Check continuity of the capacitor with the meter set at the highest resistance scale.
2. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates 9MΩ.
3. A shorted capacitor will show continuous continuity.
4. An open capacitor will show constant 9MΩ.
5. Resistance between each terminal and chassis should read infinite.
1. Isolate the diode from the circuit by disconnecting its leads.
2. With the ohm-meter set at the highest resistance scale, measure across the diode terminals. Reverse the
meter leads and read the resistance. A meter with 6V, 9V or higher voltage batteries should be used to
check the front-to back resistance of the diode (otherwise an infinite resistance may be read in both
directions). The resistance of a normal diode will be infinite in one direction and several hundred KΩin
the other direction.
1. When mounting Primary switch and Interlock
Monitor switch to Latch Body, consult the
figure.
2. No specific adjustment during installation of
Primary switch and Monitor switch to the latch
body is necessary.
3. When mounting the Latch Body to the oven
assembly, adjust the Latch Body by moving it so
that the oven door will not have any play in it.
Check for play in the door by pulling the door
assembly. Make sure that the latch keys move
smoothly after adjustment is completed.
Completely tighten the screws holding the Latch
Body to the oven assembly.
4. Reconnect to Monitor switch and check the
continuity of the monitor circuit and all latch
switches again by following the components test
procedures.
5. Confirm that the gap between the switch
housing and the switch actuator is no more than
0.5mm when door is closed.
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 switche, and the interlock monitor switch (replace all
together). Then follow the adjustment procedures below. After repair and adjustment, be sure to check the continuity of all
interlock switches and the interlock monitor switch.
Alignment and Adjustments
Door Open Door Closed
Primary switch ∞0
Monitor switch (COM-NC) 0 ∞
Secondary switch ∞0
Primary Interlock Switch
Lever Switch
Body Latch Secondary Switch
Interlock Monitor
Switch

Samsung Electronics 5-3
7. Normal temperature rise for this model is 9ûC to 11ûC at 'HIGH'.
NOTE 1: Variations or errors in the test procedure will cause a variance in the temperature rise.
Additional power test should be made if temperature rise is marginal.
NOTE 2: Output power in watts is computed by multiplying the temperature rise (step 5) by a factor of 90
times the of centigrade temperature.
4.187 x 1000 x ∆T+0.88xMcx(T2-T0)
Output Power = 46.5
46.5: Heating Time (sec)
4.187 : Coefficient for Water
1000 : Water (cc)
∆T : Temperature Rise (T2-T1)
Mc : Cylindrical borosilicate glass weight
To : Room temperature.
5-6 Output Power of Magnetron
Alignment and Adjustments
CAUTION
MICROWAVE RADIATION
PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE GENERATOR OR OTHER PARTS
CONDUCTING MICROWAVE ENERGY.
5-7 Microwave Heat Distribution - Heat Evenness
The output power of the magnetron can be measured by performing a water temperature rise test.
Equipment needed :
* Two 1-liter cylindrical borosilicate glass vessel (Outside diameter 190 mm)
* One glass thermometer with mercury column
NOTE: Check line voltage under load. Low voltage will lower the magnetron output. Make all temperature
and time tests with accurate equipment.
1. Fill the one liter glass vessel with water.
2. Stir water in glass vessel with thermometer, and record the water temperature in the glass vessel("T1", 10±1ûC).
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 48seconds 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 ("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;
The microwave heat distribution can be checked indirectly by measuring the water temperature rise at
certain positions in the oven:
1. Prepare five beakers made of 'Pyrex', having 100 milliliters capacity each.
2. Measure exactly 100milliliters off water load with a measuring cylinder, and pour into each beaker.
3. Measure the temperature of each water load. (Readings shall be taken to the first place of decimals.)
4. Put each beaker in place on the cooking tray as illustrated in figure below. Start heating.
5. After heating for 2 minutes, measure the water temperature in each beaker.
6. Microwave heat distribution rate can be calculated as follows:
Minimum
Temperature Rise
Heat Distribution = X 100(%)
Maximum
Temperature Rise
The result should exceed 65%.
D
D
D/4
D/4
D/4
D/4
Cooking Tray
Beaker

Samsung Electronics5-4
Alignment and Adjustments
5-13 Leakage Measuring Procedure
5-10 Procedure for Measurement of Microwave Energy Leakage
5-12Note on Measurement
5-11 Check for Microwave Leakage
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 5 mW/cm2after 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.
1. Remove the outer panel.
2. Pour 275±15cc of 20±5ûC(68±9ûF) water in a
beaker which is graduated to 600cc, and
place the beaker in the center of the oven.
3. Start the oven at the highest power level.
4. Set survey meter dual ranges to 2,450MHz.
5. Using the survey meter and spacer cone as
described above, measure arnear the
opening of magnetron, the surface of the air
guide and the surface of the wave guide as
shown in the following photo.( but avoid the
high voltage components.) The neading
should be less than 5mW/cm2.
1) Do not exceed the limited scale.
2) The test probe must be held on the grip of the handle, otherwise a false reading may result when the
operator's hand is between the handle and the probe.
3) When high leakage is suspected, do not move the probe horizontally along the oven surface; this may
cause damage to the probe.
4) Follow the recommendation of the manufacturer of the microwave energy survey meter.
1) Pour 275±15cc of 20±5ûC ( 68¡9ûF ) water in a
beaker which is graduated to 600cc, and place
the beaker in the center of the oven.
2) Start to operate the oven and measure the
leakage by using a microwave energy survey
meter.
3) Set survey meter with dual ranges to 2,450MHz.
4) When measuring the leakage, always use the 2
inch spacer cone with the probe. Hold the probe
perpendicular to the cabinet door. Place the
spacer cone of the probe on the door and/or
cabinet door seam and move along the seam,
the door viewing window and the exhaust
openings moving the probe in a clockwise direction at a rate of 1 inch/sec. If the leakage testing of the
cabinet door seam is taken near a corner of the door, keep the probe perpendicular to the areas making
sure that the probe end at the base of the cone does not get closer than 2 inches to any metal. If it gets
closer than 2 inches, erroneous readings may result.
5) Measured leakage must be less than 4mW/cm2, after repair or adjustment.
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CE935G
Maximum allowable leakage is 5mW/cm2.
4mW/cm2is used to allow for measurement and meter accuracy