Samsung CE745GR Service Manual

MICROWAVE OVEN

CE745GR

SERVICE

Manual

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

9. Schematic Diagrams

BWT

GRILL

CE745GR

lbs. kg

oz. g

1min+

h

10min

min 1min

1-2-3

Auto

10s.

2. Specifications

2-1 Table of Specifications

ITEM TIMER 99 MINUTES 90 SECONDS POWER SOURCE 230V/50HZ, AC POWER CONSUMPTION MICROWAVE : 1,400W,GRILL : 1100W OUTPUT POWER FROM85 TO 850W (10 LEVEL POWER)

OPERATING FREQUENCY 2,450MHz MAGNETRON OM75PH(31) COOLING METHOD COOLING FAN MOTOR OUTSIDE DIMENSIONS 191/4"(W) x 1027/32"(H) x 143/8"(D) NET WEIGHT 36.3 LBS. SHIPPING WEIGHT 39.6 LBS.

MODEL CE745GR

(IEC-705 TEST PROCEDURE)

2-2 Comparison Chart

MODEL

FEATURE

MORE/LESS O

AUTO REHEAT O AUTO DEFROST O TIME COOK O POWER LEVEL O INSTANT COOK O MEMORY O BOOST CHILD LOCK O CLOCK O GRILL O COMBI O

CE745GR

Samsung Electronics 2-1

CE745GR

lbs.

kg

oz.

g

1min+

h

10min

min

1min

1-2-3

Auto

10s.

Auto Defrost Butten

Kg,g Button

Power Level Selection Button

Memory Button

Hold/Timer Button

Stop Button Start/Boost Button

Timer Setting Button

Grill Button Combi Button

Clock Setting Button

More/Less Button

Auto Cook Button

Instant Cook Button

3. Operating Instructions

3-1 Control Panel

Samsung Electronics 3-1

3-2 Features & External Views

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

Door

Ventilation Slot Light

Safety Interlock Holes

Control Panel

Open Door Push Button

Guide Roller

GRILL WIRE RACK

Glass Plate

Door Latches

CE745GR

lbs. kg

oz. g

1min+

h

10min

min 1min

1-2-3

Auto

10s.

489mm

357mm

275mm

200mm

365mm

GRILL

CE745GR

lbs. kg

oz. g

1min+

h

10min

min 1min

1-2-3

Auto

10s.

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 500pF capacitors (all of which are contained in one assembly).

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

2. Remove the bracket mounting.

3. Remove the air cover.

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

5. Take out the magnetron very carefully.

6. Remove screws from the back panel.

7.Remove the assy noise filter.

8. Take out the fan motor.

9. Remove the oven lamp by pulling out from hole of air cover carefully.

10. NOTE1: When removing the magnetron, make

sure that its antenna does not hit any adjacent parts, or it may be damaged.

11. 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

BKT-Mountain

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.

4-3-2 Removal of Door "C"

4-3-3 Removal of Door "E"

Disassembly and Reassembly

Upper Hinge

Lower Hinge

Screw

Door "C"

Door "A"

Door "E"

4-3-4 Removal of Key Door & Spring

Samsung Electronics 4-3

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

2. 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.

3. 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.

4. 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.

5. Do the microwave leakage test.

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, 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.

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.

4-4 Replacement of Fuse

4-5 Replacement of Drive Motor

Key Door Spring

Door "E"

Disassembly and Reassembly

Screw

Drive Motor Cover Base Plate

Thermo Switch

Drive Motor