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MICROWAVE OVEN
BASIC: CE1180GBR
MODEL : CE1185UB
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
SEF
Contents
1. Precaution 1
1-1 Safety precautions 1
1-2 Special Servicing Precautions (Continued) 2
1-3 Special High Voltage Precautions 2
2. Specifications 3
2-1 Table of Specifications 3
3. Operating Instructions 4
3-1 Control Panel 4
3-2 Features & External Views 5
3-3 Accessory 6
4. Disassembly and Reassembly 7
4-1 Replacement of Magnetron, Motor Assembly and Lamp 7
4-2 Replacement of High Voltage Transformer 7
4-3 Replacement of Door Assembly 8
4-3-1 Removal of Door Assembly 8
4-3-2 Removal of Door "C" 8
4-3-3 Removal of Door "E" 8
4-3-4 Removal of Key Door & Spring 8
4-3-5 Reassembly Test 9
4-4 Replacement of Fuse 9
4-5 Replacement of Drive Motor 9
4-6 Replacement of Control Circuit Board 10
4-6-1 Removal of Control Box Assembly 10
5. Alignment and Adjustments 11
5-1 High Voltage Transformer 11
5-2 Low Voltage Transformer 11
5-3 Magnetron 11
5-4 High Voltage Capacitor 12
5-5 High Voltage Diode 12
5-6 Main Relay and Power Control Relay 12
5-7 Adjustment of Primary Switch, Door Sensing Switch and Monitor Switch 12
5-8 Output Power of Magnetron 13
5-9 Procedure for Measurement of Microwave Energy Leakage 14
5-10 Check for Microwave Leakage 14
5-11 Note on Measurement 14
5-12 Leakage Measuring Procedure 14
6. Troubleshooting 15
6-1 Electrical Malfunction 15
7. Exploded Views and Parts List 17
7-1 Exploded Views 17
7-2 Main Parts List 18
7-3 Door Parts List 20
7-4 Control Parts List 21
7-5 Casing Parts List 22
7-6. Standard Parts List 23
8. P.C.B Diagrams 24
8-1 P.C.B Diagrams 24
8-2 P.C.B Parts List 25
9. Schematic Diagrams 27
9-1 Schematic Diagrams 27
10. Reference 28
10-1 Model name standard 28
10-2 Customer inquiry cases and countermeasures 29
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 (c) Before turning on microwave power for
operated with the door open. any service test or inspection within the
(b) Make the following safety checks on all microwave generating compartments,
ovens to be serviced before activating the check the magnetron, wave guide or
magnetron or other microwave source, transmission line, and cavity for proper
and make repairs as necessary: alignment, integrity, and connections.
(1) Interlock operation, (d) Any defective or misadjusted components
(2) proper door closing, in the interlock, monitor, door seal, and
(3) seal and sealing surfaces microwave generation and transmission
(arcing, wear, and other damage), systems shall be repaired, replaced, or
(4) damage to or loosening of hinges and adjusted by procedures described in this
latches, manual before the oven is released to the
(5) evidence of dropping or abuse. 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 11. To avoid any possible radiation hazard, replace
procedures described in this manual. This product parts in accordance with the wiring diagram. Also,
complies with Federal Performance Standard 21 use only the exact replacements for the following
CFR Subchapter J(DHHS). parts: Primary and secondary interlock switches,
interlock monitor switch.
2. Microwave emission check should be performed to
prior to servicing if the oven is operative. 12. If the fuse is blown by the Interlock Monitor Switch:
Replace all of the following at the same time:
3. If the oven operates with the door open : Primary, door sensing switch and power relay, as
Instruct the user not to operate the oven and well as the Interlock Monitor Switch. The correct
contact the manufacturer and the center for devices adjustment of these switches is described
and radiological health immediately. elsewhere in this manual. Make sure that the fuse
has the correct rating for the particular model
4. Notify the Central Service Center if the being repaired.
microwave leakage exceeds 5 mW/cm2.
13. Design Alteration Warning:
5. Check all grounds. Use exact replacement parts only, i.e., only those
that are specified in the drawings and parts lists
6. Do not power the MWO from a "2-prong" AC cord. of this manual. This is especially important for the
Be sure that all of the built-in protective devices are Interlock switches, described above. Never alter
replaced. Restore any missing protective shields. or add to the mechanical or electrical design of the
MWO. Any design changes or additions will void
7. When reinstalling the chassis and its assemblies, the manufacturer's warranty. Always unplug the
be sure to restore all protective devices, including: unit's AC power cord from the AC power source
nonmetallic control knobs and compartment covers. before attempting to remove or reinstall any
component or assembly.
8. Make sure that there are no cabinet openings
through which people --particularly children --might 14. Never defeat any of the B+ voltage interlocks. Do
insert objects and contact dangerous voltages. not apply AC power to the unit
Examples: Lamp hole, ventilation slots. (or any of its assemblies) unless all solid-state
heat sinks are correctly installed.
9. Inform the manufacturer of any oven found to have
emission in excess of 5 mW/cm2, Make repairs to 15. Some semiconductor ("solid state") devices are
bring the unit into compliance at no cost to owner easily damaged by static electricity. Such
and try to determine cause. Instruct owner not to components are called Electrostatically Sensitive
use oven until it has been brought into compliance. Devices (ESDs). Examples include integrated
circuits and field -effect transistors. Immediately
CENTRAL SERVICE CENTER before handling any semiconductor components
or assemblies, drain the electrostatic charge from
10. Service technicians should remove their watches your body by touching a known earth ground.
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.
NOTE : Connect the oven to a 20A. When
connecting the oven to a 15A, make
sure that circuit breaker can operate.
1-3 Special High Voltage Precautions
1. High Voltage Warning
Do not attempt to measureany of the high H. V. Capacitor
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 the
negative terminal of the high-voltage capacitor to
the oven chassis. (Use a screwdriver.)
3. High voltage is maintained within specified limits by Short
close-tolerance, safety-related components and
adjustments. If the high voltage exceeds the H. V. Diode
specified limits, check each of the special
components.
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 PRECAUTION
There exists HIGH VOLTAGE ELECTRICITY with Never touch any circuit wiring with your hand nor
high current capabilities in the circuits of the HIGH with uninsulated tool during operation.
VOLTAGE TRANSFORMER secondary and fila-
ment terminals. It is extremely dangerous to work
on or near these circuits with the oven energized. PRECAUTION
DO NOT measure the voltage in the high voltage Servicemen should remove their watches when-
circuit including filament voltage of magnetron. ever working close to or replacing the magnetron.
-2-
2. Specifications
2-1 Table of Specifications
TIMER 99 MINUTES
POWER SOURCE 230V 50Hz, AC
POWER CONSUMPTION MICROWAVE : 1,400W
GRILL : 1,300W
CONVECTION : 1,700W
OUTPUT POWER FROM 100 TO 900W(6 LEVEL POWER)
(IEC-705 TEST PROCEDURE)
OPERATING FREQUENCY 2,450MHz
MAGNETRON OM75PH(31)
COOLING METHOD COOLING FAN MOTOR
OUTSIDE DIMENSIONS(mm) 522(W) x 539(H) x 312(D)
SHIPPING WEIGHT 23.5 kg
NET WEIGHT 21.0 kg
-3-
3. Operating Instructions
3-1 Control Panel
1 8
2
3 9
4
10
5 11
6
12
7 13
14
1. MICROWAVE BUTTON 8. CONVECTION BUTTON
2. GRILL BUTTON 9. FAST PREHEAT SELECTION BUTTON
3. POWER DEFROST FEATURE MODE 10. SELECT BUTTON
4. COMBINED BUTTON 11. STEAM CLEAN BUTTON
5. AUTO COOK FEATURE MODE 12. JOG DIAL
6. DISPLAY 13. START BUTTON
7. STOP / CANCEL BUTTON 14. TURNTABLE ON/OFF BUTTON
-4-
3-2 Features & External Views
Door Ventilation Holes Light Safety Interlock Holes
Control Panel
Guide Roller
Glass Plate
Door Latches Grill Rack Coupler
312mm
369mm 216mm
522mm 539mm
-5-
3. Operating Instructions
3-3 Accessory
Depending on the model that you have purchased, you are supplied with several accessories that can be used
in a variety of ways.
1. Coupler, alleady placed over the motor shaft in the base of the oven.
Purpose: The coupler rotates the turntable.
2. Roller ring, to be placed in the centre of the oven.
Purpose: The roller ring supports the turntable.
3. Turntable, to be placed in the roller ring with the centre fitting to the coupler.
Purpope: The turntable serves as the main cooking surface;
it can be easily removed for cleaning.
4. Metal racks (High rack, Low rack), to be placed on the turntable.
Purpose: The metal racks can be used to cook two dishes at the same time.
A small dish may be placed on the turntable and a second dish on the rack.
The metal racks can be used in grill, convection and combination cooking.
5. Clean water bowl, to be placed in the right side of the oven.
Purpose: The water bowl can be used to clean.
6. Roasting spit, Coupler barbecue and Skewer, to be placed in the glass bowl
Purpose: The roasting spit is a convenient way of barbecuing a chicken,
as the meat does not have to be turned over.
It can be used for grill combination cooking.
7. Glass bowl, to be placed on the turntable
Purpose: Roasting stand is placed on the glass bowl.
8. Crust plate, to be placed on the turntable
Purpose: The crust plate is used to brown food better in the microwave or grill
combination cooking modes and to keep pastry and pizza dough crisp.
-6-
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 which are contained in one assembly).
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 pulling out from hole of
air cover.
NOTE 1 : When removing the magnetron, make
sure that its antenna does not hit any adja-
cent parts, or it may be damaged.
NOTE 2 : When replacing the magnetron, be sure to
remount the magnetron gasket in the
correct position and make sure the gasket
is in good condition.
4-2 Replacement of High Voltage Transformer
1. Discharge the high voltage capacitor.
2. Disconnect all the leads. PRECAUTION
3. Remove the mounting bolts.
Servicemen should remove their watches whenever
4. Reconnect the leads correctly and firmly.
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.
-7-
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.
Screw
Screw Upper Hinge
Upper Hinge
Screw
Screw
Lower Hinge
Lower Hinge
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.
Door "C"
4-3-3 Removal of Door "E"
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.
1. Insertion depth of the thin metal plate should be
0.5mm or less.
4-3-4 Removal of Key Door & Spring
Remove pin hinge from Door "E"
Detach spring from Door "E" and key door. Door "E"
Key Door
Spring
-8-
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 assem-
bly 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 15A 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 from oven cavity,
disconnect power.
2. Remove turn table motor cover from case bottom.
CAUTION : Remove sharp edge after cover removal.
3. Disconnect leads from motor.
4. Remove the screws securing motor to bottom of over
cavity and lift out the motor.
5. When replacing the motor, be sure to remount it in
the correct position.
NOTE : The shaft of motor should fit tip coupler.
6. Screw the motor to bottom of oven cavity.
7. Connect leads to the drive motor.
8. Screw the drive motor cover to the base plate with a
screw driver.
NOTE : Bring the spare screw from service center.
COVER FIXING SCREW :
MACHINE SCREW(6006-001170)
-9-
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
Control Box
the keyboard. Screw
4-6-2 Removal of Ass'y P.C.B Assembly
Assy-Key Module
1. Remove screws securing the control circuit
board.
2. Lift up the control circuit board from the Ass'y
control box.
SCREWS
P.C.B
SCREWS
- 10 -
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.
Filament Terminals
2. Normal resistance readings are as follows:
Secondary Approx. 122.5 Secondary
Terminal
Filament Approx. 0
Primary Approx. 0.455
(Room temperature = 20