LG SolarDOM MP-9486SC User manual

LIGHT OVEN “SolarDOM”
SERVICE MANUAL
MODEL: MP-9486SC
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Website: http://biz.lgservice.com
P/NO : 382885S5381
February, 2006
Printed in Korea
삼흥
정판

This device is to be serviced only by properly qualified service personnel.
Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be
taken to avoid possible exposure to excessive microwave energy.
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 operated with the door open.
B) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary; (1) interlock operation, (2) proper door closing, (3)
seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and
latches, (5) evidence of dropping or abuse.
C) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
D) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation
and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual
before the oven is released to the 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.
SAFETY PRECAUTIONS
CAUTION
MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR
OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.

(Page)
SAFETY PRECAUTIONS ---------------------------------------------------------------------- Inside front cover
SPECIFICATIONS
----------------------------------------------------------------------------------------------------- 1-1
CAUTIONS
---------------------------------------------------------------------------------------------------------------
2-1
INSTALLATIONS
------------------------------------------------------------------------------------------------------ 3-1
OPERATING INSTRUCTIONS
------------------------------------------------------------------------------------ 4-1
FEATURES ------------------------------------------------------------------------------------------------------------------------ 4-1
CONTROL PANEL -------------------------------------------------------------------------------------------------------------- 4-1
OPERATING SEQUENCE
---------------------------------------------------------------------------------------------------- 4-2
SCHEMATIC DIAGRAM
------------------------------------------------------------------------------------------------------ 4-3
CIRCUIT DESCRIPTION
----------------------------------------------------------------------------------------------------- 4-4
SERVICE INFORMATION ------------------------------------------------------------------------------------------- 5-1
TOOLS AND MEASURING INSTRUMENTS --------------------------------------------------------------------------- 5-1
MICROWAVE LEAKAGE TEST
-------------------------------------------------------------------------------------------- 5-1
MEASUREMENT OF MICROWAVE POWER OUTPUT
----------------------------------------------------------- 5-3
DISASSEMBLY AND ADJUSTMENT ------------------------------------------------------------------------------------- 5-3
UPPER & LOWER HEATER
------------------------------------------------------------------------------------------------ 5-7
INTERLOCK CONTINUITY TEST
------------------------------------------------------------------------------------------ 5-8
COMPONENT TEST PROCEDURE -------------------------------------------------------------------------------------- 5-9
TROUBLE SHOOTING ------------------------------------------------------------------------------------------------------ 5-14
EXPLODED VIEW
------------------------------------------------------------------------------------------------ 6-1
REPLACEMENT PARTS LIST
------------------------------------------------------------------------------------ 7-1
CONTENTS

1-1
SPECIFICATIONS
This oven is designed for household use only.
It is not recommended for commercial purposes.
DESCRIPTION
MP-9486SC
230 Volts AC 50 Hz
Single phase, 3 wire grounded
Microwave 1650W
Grill Max 2100W
Combination Max 2800W
Convection 1900W
900 Watts full microwave power (IEC60705)
2450 MHz
2M214 - 240GP
0 ~ 90 min.
527 (W) x 392 (H) x 480 (D)mm
440 (W) x 204 (H) x 420 (D)mm
28 kg
31 kg
1. Microwave Power level: 3. Convection: 40°C, 100~250°C
MAX (900W), 600W, 360W, 180W, 90W
4. COMBI
2. GRILL
5. SPEED AUTO COOK
Owner's manual & Cook book
High rack, Low rack
Steam cover, Steam plate, Steam water bow (Metal tray)
ITEM
MODEL
Power Requirement
Power Output
Microwave Frequency
Magnetron
Timer
Outside Dimensions
Cavity Dimensions
Net Weight
Shipping weight
Control Complement
Rating Label Location
Accessories
Front Plate
Category Display Heater operating
Grill-1 gr-1 Upper heater (2000W)
Grill-2 gr-2 Upper heater (1100W)
Grill-3 gr-3 Lower heater (700W)
Display Heater + Microwave power selection
Co-1 Grill-1 + 180W, 360W, 600W
Co-2 Grill-2 + 180W, 360W, 600W
Co-3 Grill-3 + 180W, 360W, 600W
Co-4 (Upper+Lower)+0W, 180W, 360W, 600W
Co-5 Convection + 180W, 360W, 600W

•DO NOT operate on a 2-wire extension cord during
repair and use.
•NEVER TOUCH any oven components or wiring during
operation.
•BEFORE TOUCHING any parts of the oven, always
remove the power plug from the outlet.
•For about 30 seconds after the oven stops, an electric
charge remains in the high voltage capacitor. When
replacing or checking, you must discharge the high
voltage capacitor by shorting across the two terminals
with an insulated screwdriver.
• Remove your watches whenever working close to or
replacing the Magnetron.
•NEVER operate the oven with no load.
•NEVER injure the door seal and front plate of the oven
cavity.
•NEVER put iron tools on the magnetron.
•NEVER put anything into the latch hole and the
interlock switches area.
•Proper operation of the microwave oven requires that
the magnetron be assembled to the waveguide and
cavity. Never operate the magnetron unless it is
properly installed.
• Be sure that the magnetron gasket is properly
installed around the dome of the tube whenever
installing the magnetron.
2-1
CAUTIONS
Unlike other appliances, the microwave oven is
high-voltage and high-current equipment.
Though it is free from danger in ordinary use,
extreme care should be taken during repair.
THE OVEN IS TO BE SERVICED ONLY
BY PROPERLY QUALIFIED SERVICE
PERSONNEL.
MICROWAVE RADIATION
Personnel should not be exposed to the
microwave energy which may radiate from the
magnetron or other microwave generating
device if it is improperly used or connection.
All input and output microwave connections,
waveguide, flange and gasket must be secure
never operate the device without a microwave
energy absorbing load attached.
Never look into an open waveguide or antenna
while the device is energized.
Gasket
ANTENNA
COOLING FIN
MAGNETRON
CHASSIS GROUND
FILAMENT
TERMINALS
MAGNETRON

INSTALLATIONS
3-1
INSTALLING
1. Empty the oven and clean inside it with a soft,
damp cloth. Check for damage such as misaligned
door, damage around the door or dents inside the
cavity or on the exterior.
2. Put the oven on a counter, table, or shelf that is
strong enough to hold the oven and the food and
utensils you put in it. (Use care when handling.)
3. Do not block the vent and the air intake openings.
Blocking vent or air intake openings can cause
damage to the oven and poor cooking results.
Make sure the microwave oven legs are in place to
ensure proper air flow.
4. The oven should not be installed in any area where
heat and steam are generated, because they may
damage the electronic or mechanical parts of the
unit.
Do not install the oven next to a conventional
surface unit or above a conventional wall oven.
5. Use the oven in an ambient temperature less than
104 °F(40 °C).
6. Place the oven on a sturdy and flat surface at least
10 cm(4 inches) from the wall.
7. Place the oven as far away as possible from TV,
RADIO, COMPUTER, etc., to prevent interference.
8. Do not touch the front glass during or after cooking
of the Grill and convection and Combination mode.
This glass is very hot during heater operating.
9. Do not operate the oven at microwave and
combination mode with Grill rack placed in the
cavity when the oven is empty.
EARTHING INSTRUCTIONS
This oven is designed to be used in a fully earthed
condition.
It is imperative, therefore, to make sure it is properly
earthed before servicing
WARNING-
THIS APPLIANCE
MUST BE EARTHED
IMPORTANT
As the colors of the wires in the mains lead of this
appliance may not correspond with the colored
markings identifying the terminals in your plug,
proceed as follows.
The wire which is colored green-and-yellow must be
connected to the terminal in the plug which is marked
with the letter Eor by the earth symbol ( ) or
colored green or green-and-yellow.
The wire which is colored blue must be connected to
the terminal in the plug which is marked with the letter
Nor colored black.
The wire which is colored brown must be connected
to the terminal in the plug which is marked with the
letter Lor colored red.
BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.
10cm
The wires in this mains lead are colored in
accordance with the following code:
Green-and-yellow: Earth
Blue: Neutral
Brown: Live

4-1
OPERATING INSTRUCTIONS
FEATURES
CONTROL PANEL
1. Display Window: You can show time of day, cooking time, power
level and cooking categories.
2. Enter: You can determine the selected cooking category, microwave
power level or temperature.
3. Clock: You can set the time of day.
4. Grill: You can select the grill categories.
5. Conv.: You can select temperature and time of convection.
6. Speed Combi: You can select the combination categories.
7. Speed Auto Cook: Speed auto cook allows you to cook most of your
favorite food quickly by selecting the food type and the weight of the
food.
8. Dial Knob:
• You can set cooking times, temperature, weight and cooking
categories.
• While cooking with auto and manual function, you can set or
change the cooking time at any point by turning the dial
knob(except defrost mode).
9. Defrost: You can select the food type and the weight of the food.
10. Favorite: The cooking program can be stored in the memory of your
oven up to 9 modes(FA-1~FA-9).
11. Micro: You can select five power level settings.
12. Stop/Clear: You can stop over and clear all entries except time of
day.
• Press Stop/Clear Button one time, all icons will be displayed on
window, in time of day or clear mode.
• Press Stop/Clear Button one more time, all icons will be
disappeared.
13. Start/Quick Start:
• In order to start cooking which is selected, press button one time.
• The quick start feature allows you to set 30 second intervals of
HIGH power cooking with a touch of the quick start button.
14. Icon: You can see all icons by pressing “Stop/Clear” button one time
and remove all icons by pressing one more time(all icons will
disappear automatically after 15 seconds).
Blink will guide to next step for setting while cooking, the icon of the
selected cooking mode will be displayed on window.
Control Panel Deco.
Control Panel
Oven Front Plate
Window Door Screen
Door Frame
HIGH Rack LOW Rack Metal Tray
Choke Cover
Safety Door Lock System
STEAM COVER
STEAM PLATE
STEAM WATER
BOWL
(Crispy Tray)
Steamer

4-2
OPERATING SEQUENCE
The following is a description of component functions
during oven operation.
1. SETTING THE CLOCK
2. MICROWAVE COOKING
3. MULTI STAGE COOKING (MICROWAVE)
Stage 1
Stage 2
4. GRILL COOKING
*Grill Categories
5. CONVECTION COOKING
To cook
6. SPEEDCOMBI COOKING
*Speed Combi Categories
Grill & Convection & Speed Combi
ex)
7. DEFROST
8. SPEED COMBI COOK
9. SPEED AUTO COOK
10. CHILD LOCK
This oven has a CHILD LOCK feature.
To Set CHILD LOCK
To Cancel CHILD LOCK
11. QUICK START
12. FAVORITE (MEMORY COOK)
To set
To cook
Stop/Clear Clock Turn Dial
Desired
hour
Turn Dial
Desired
minute Start
Stop/
Clear
Function
MWO
Turn Dial
Desired
power level
Stop/
Clear
Turn Dial
Desired
cooking time
Function
Grill
Start
Turn Dial
Desired
Grill-1,2,3 Enter
Stop/Clear Start/Quick Start
Stop/
Clear
Function
Convection
Turn Dial
Desired convection
temp(40°C, 100°C ~ 250°C)
Enter
Enter
Enter
Turn Dial
Desired
cooking time Enter
Stop/
Clear
Function
MWO Enter
Turn Dial
Desired
power level
Turn Dial
Desired
cooking time
Stop/Clear Stop/Clear
(Touch and Hold)
Stop/Clear Stop/Clear
(Touch and Hold)
Stop/Clear Favorite Any mode Favorite
(FA-1)
Favorite
(FA-1) Start
Desired
cooking
time Start
Start
Function
MWO Enter
Desired
power
level
Desired
cooking
time
Grill-1
Grill-2
Grill-3
(Halogen+Ceramic+Sheather) Upper Heater
Upper Sheath Heater
Lower Sheath Heater
Co-1
Co-2
Co-3
Co-4
Co-5
Grill-1 + Microwave Power Level
Grill-2 + Microwave Power Level
Grill-3 + Microwave Power Level
(Upper+Lower Heater) + Microwave Power Level
Convection + Microwave Power Level
Stop/
Clear
Function
Combi-4
Turn Dial
Desired convection
temp(40°C, 100°C~250°C)
Enter
Enter Start
Desired
power
level
Desired
Cooking
time
Enter
Stop/
Clear
Function
Defrost
Food
weight
Turn Dial
Desired defrost
category
Start
Stop/
Clear
Function
Speed
cook
Food
weight
Turn Dial
Desired speed
cook category
Start
Stop/
Clear
Function
Auto
cook
Food
weight
Turn Dial
Desired auto
cook category
Start

SCHEMATIC DIAGRAM
4-3

4-4
CIRCUIT DESCRIPTION
GENERAL DETAILS
•The low voltage transformer supplies the necessary
voltage to the micom controller when power cord is
plugged in.
•When the door is closed, the primary switch is ON, the
secondary switch is ON, and the monitor switch opens
(contact COM and NO).
WHEN SELECTING COOKING POWER
LEVEL AND TIME
•The micom controller memorizes the function you set.
•The time you set appears in the display window.
•Each indicator light turns on to indicate that the stage
has been set.
WHEN TOUCHING THE START BUTTON
•The coil of the relay is energized by the micom
controller.
•Power input is supplied to the high voltage transformer
through the fuse to the primary switch and relay 4.
•Turntable rotates.
•The fan motor rotates and cools the magnetron by
blowing the air (coming from the intake on the
back cover).
•The air is also directed into the oven to exhaust the
vapor in the oven through the upper plate.
•Cooking time starts counting down.
•3.2 volts AC is generated from the filament winding of
the high voltage transformer. This 3.2 volts is applied to
the magnetron to heat the magnetron filament through
two noise-preventing choke coils.
•A high voltage of approximately 2100 volts AC is
generated in the secondary of the high voltage
transformer which is increased by the action of the high
voltage diode and charging of the high voltage
capacitor.
•The negative 4,000 Volts DC is applied to the filament
of the magnetron.
WHEN THE OVEN IS SET AT ANY LEVEL
EXCEPT MAXIMUM.
•The micom controller controls the ON-OFF time of
relay 4 by the applied signal to vary the average output
power of oven as POWER LEVEL. (refer to page 1-1)
•One complete cycle of relay 4 is 32 seconds.
WHEN THE DOOR IS OPENED DURING
COOKING
•Both the primary switch and relay 4 are cut off primary
winding voltage of the high voltage transformer.
•ON-OFF of relay 4 is coupled electrically with opening
and closing of the secondary switch.
•When the door is opened, the secondary switch is
opened and when the door is closed, the secondary
switch is closed.
•The cooking time stops counting down.
•Relay stops functioning.
•As the door is opened, if the contact of primary switch
and relay 4 fails to open, the fuse opens due to the
large current surge caused by the monitor switch
activation, which in turn stops magnetron oscillation.
WHEN TOUCHING THE START BUTTON
WITH THE HEATER COOKING
FUNCTION SELECTED
•The contacts of the primary switch and the secondary
switch close the circuit.
•A.C. voltage is applied to the heater through thermostat
as shown by the solid line.
•Turntable rotates.
•The fan motor rotates.
•The air is also directed into the oven to exhaust the
vapor in the oven through the base plate and back
plate.
L
FUSE
H.V.
TRANS-
FORMER
RELAY 4
MICOM CONTROLLER
SECONDARY
SWITCH
PRIMARY
SWITCH
N
MONITOR
SWITCH
L
FUSE
H.V.
TRANS-
FORMER
RELAY 4
MICOM CONTROLLER
SECONDARY
SWITCH
PRIMARY
SWITCH
N
MONITOR
SWITCH
RELAY 5, 6, 7
L
N
THERMOSTAT
HEATER
L
G -Y
N
E

CAUTIONS
•Be sure to check microwave leakage prior to
servicing the oven if the oven is operative prior to
servicing.
•The service personnel should inform the
manufacture importer, or assembler of any
certified oven unit found to have a microwave
emission level in excess of 5 mW/cm2and should
repair any unit found to have excessive emission levels
at no cost to the owner and should ascertain the cause
of the excessive leakage. The service personnel
should instruct the owner not to use the unit until the
oven has been brought into compliance.
•If the oven operates with the door open, the service
personnel should:
- Tell the user not to operate the oven.
- Contact the manufacturer.
•The service personnel should check all surface and
vent openings for microwave leakage.
•Check for microwave leakage after every servicing.
The power density of the microwave radiation leakage
emitted by the oven should not exceed 4 mW/cm2.
Always start measuring of an unknown field to assure
safety for operating personnel from radiation leakage.
MEASURING MICROWAVE ENERGY
LEAKAGE
•Pour 275±15cc of 20±5°C(68±9°F) water in a beaker
which is graduated to 600 cc, and place the beaker
on the center of the turntable.
•Set the energy leakage monitor to 2,450 MHz and
use it following the manufacturer's recommended
test procedure to assure correct result.
•When measuring the leakage, always use the 2-
inch (5cm) spacer supplied with the probe.
•Operate the oven at its maximum output.
•Measure the microwave radiation using and
electromagnetic radiation monitor by holding the
probe perpendicular to the surface being measured
Move probe along shaded area
Probe scanning speed
Less than 2.5 cm/sec
( 1in/sec)
5-1
SERVICE INFORMATION
TOOLS AND MEASURING INSTRUMENTS
MICROWAVE LEAKAGE TEST
NECESSARY TOOLS
Tools normally used for TV servicing are sufficient.
Standard tools are listed below.
•Diagonal pliers
•Long nose pliers
•Phillips screwdriver
•Flat blade screwdriver
•Wrench (size 5mm)
•Nutdriver (size 5mm)
•Adjustable wrench
•Soldering iron
•Solder
•Vinyl insulation tape
•Polishing cloth
NECESSARY MEASURING INSTRUMENTS
•TESTER(VOLTS-DC, AC., Ohmmeter)
•Microwave survey meter
- Holaday HI-1500
HI-1501
- Narda 8100
8200
•Inch scale
•600 cc non conductive material beaker (glass or plastic),
inside diameter: approx. 8.5 cm(31/2 in.)
•Cylindrical and made of borosilicate glass vessel.
max. thickness: 3 mm
outside diameter: approx. 190mm
height: approx. 90mm
•Glass thermometer: 100°C or 212°F (1 deg scale)

MEASUREMENT WITH OUTER CASE
REMOVED
•When you replace the magnetron, measure for
microwave energy leakage before the outer case is
installed and after all necessary components are
replaced or adjusted.
Special care should be taken in measuring the
following parts. (Circled area of below Fig.)
- Around the magnetron
- The waveguide
MEASUREMENT WITH A FULLY
ASSEMBLED OVEN
•After all components, including the outer case, are fully
assembled, measure for microwave energy leakage
around the door viewing window, the exhaust opening,
and air inlet openings.
•Microwave energy leakage must not exceed the values
prescribed below.
NOTE: Leakage with the outer case removed less than
5 mW/cm2.sq. Leakage for a fully assembled
oven (Before the latch switch (primary) is
interrupted) with the door in a slightly opened
position-less than 2 mW/cm2.sq.
NOTES WHEN MEASURING
•Do not exceed meter full scale deflection.
•The test probe must be removed no faster than
1 inch/sec (2.5 cm/sec) along the shaded area,
otherwise a false reading may result.
•The test probe must be held with the grip portion of the
handle.
A false reading may result if the operator's hand is
between the handle and the probe.
•When testing near a corner of the door, keep the probe
perpendicular to the surface making sure the probe is
moved horizontally along the oven surface.
RECORD KEEPING AND NOTIFICATION
AFTER MEASUREMENT
•After adjustment and repair of any microwave energy
interruption or microwave energy blocking device,
record the measured values for future reference. Also
enter the information on the service invoice.
•The microwave energy leakage should not be more
than 4 mW/cm2.sq. after determining that all parts are
in good condition, functioning properly and genuine
replacement parts which are listed in this manual have
been used.
•At least once a year, have the electromagnetic energy
leakage monitor checked for calibration by its
manufacturer.
WARNING : AVOID CONTACTING ANY
HIGH VOLTAGE PARTS
5-2

5-3
•Microwave power output measurement is made with
the oven supplied at its rated voltage and operated
at its maximum microwave power setting with a load
of (1000±5)g potable water.
•The water is contained in a cylindrical borosilicate
glass vessel having a maximum material thickness
of 3 mm and an outside diameter of approximately
190 mm.
•The oven and the empty vessel are at ambient
temperature prior to the start of the test.
•The initial temperature (±1) of the water is (10±2)°C.
It is measured immediately before the water is
added to the vessel. After addition of the water to
the vessel, the load is immediately placed on the
center of the shelf which is in the lowest position and
the microwave power switched on.
•The time T for the temperature of the water to rise
by a value ∆T of (10±2)°K is measured, where T is
the time in seconds and ∆T is the temperature rise.
The initial and final water temperatures are selected
so that the maximum difference between the final
water temperature and the ambient temperature is
5°K.
•The microwave power output P in watts is calculated
from the following formula :
4187 x (∆T) + 0.55 X (T2-T0)X M
T
•T2: Temperature after heating
•T0: Temperature of bowl
•M : Weight of bowl
is measured while the microwave generator is
operating at full power. Magnetron filament heat-up
time is not included.
•The water is stirred, to equalize temperature
throughout the vessel, prior to measuring the final
water temperature.
•Stirring devices and measuring instruments are
selected in order to minimize addition or removal of
heat.
WATER LOAD
TURNTABLE
MEASUREMENT OF MICROWAVE POWER OUTPUT
P =
DISASSEMBLY AND ADJUSTMENT
A. OUTER CASE REMOVAL
1) Disconnect the power supply cord from the outlet.
2) Remove the screws from the rear and along side
edges of the case.
The outer case must be moved backward to be lifted
off.
B. POWER SUPPLY CORD
1) Remove the outer case.
2) Disconnect two terminals, and remove one screw of
the earth terminal.
CAUTION: DISCHARGE THE HIGH VOLTAGE
CAPACITOR BEFORE SERVICING
(refer to page 2-1)
C. CONTROL PANEL ASSEMBLY
1) Disconnect the leadwire from the PCB SUB ASS’Y.
2) Remove the screws for the control bracket and
securing the control panel.
3) Remove control panel ASS’Y from the oven by the
moving control panel ASS’Y right side.

5-4
D. DOOR ASSEMBLY / REMOVAL
1) Disconnect power.
2) Open the door from oven. insert “JIG”into the choke
cover hole of door.
3) Lift the door from front cavity.
NOTE:
1. After replacing the door, be sure to check that the
primary switch, monitor switch, and secondary switch
operate normally.
2. After replacing the door, check for microwave energy
leakage with a survey meter. Microwave energy must
be below the limit of 5 mW/cm2. (with a 275 ml water
load)
3. When mounting the door assembly to the oven
assembly, be sure to adjust the door assembly parallel
to the chassis. Also adjust so the door has no play
between the inner door surface and oven frame
assembly. If the door assembly is not mounted
properly, microwaves may leak from the clearance
between the door and the oven.
E. HIGH VOLTAGE TRANSFORMER
REMOVAL (Refer to page 5-5)
1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from magnetron, choke filter
high voltage transformer, and capacitor.
3) Remove the screw holding the high voltage
transformer to the Insulator-U.
F. AIR GUIDE ASSEMBLY REMOVAL
1) Remove the screw on the Bracket upper and lift out
the Bracket upper.
2) Remove the mounting screw from magnetron,
upper chamber and front plate.
G. MAGNETRON REMOVAL
1) Remove controller assembly, Bracket upper and air-
guide from upper.
2) Disconnect the leadwire from the high voltage &
choke filter transformer and Magnetron.
3) Carefully remove the mounting screws holding the
magnetron and the wave guide.
4) Remove the magnetron until its dome is clear from
the wave guide.
NOTE:
1. When removing the magnetron, make sure its
dome does not hit any adjacent parts, or it may be
damaged.
2. When replacing the magnetron, be sure to install
the magnetron gasket in the correct position and
be sure that the gasket is in good condition.
3. After replacing the magnetron, check for microwave
leakage with a survey meter around the
magnetron. Microwave energy must be below the
limit of 5 mW/cm2. (With a 275 ml. water load).
Make sure that gasket is rigidly attached to the
magnetron. To prevent microwave leakage,
tighten the mounting screws properly, making sure
there is no gap between the waveguide and the
magnetron.
JIG
JIG
DOOR JIG P/No.
383EW5A224A
m
m
0
3
5mm
7mm
30mm
18mm
Magnetron
Choke Filter
Air-Guide
Bracket
upper

5-5
H. FAN MOTOR ASSEMBLY / REMOVAL
1) Remove controller assembly, air-guide, power cord,
latch board-R from upper.
2) Disconnect the leadwire from fan motor, latch board-R
and Noise filter.
3) Remove the three screws holding the the upper plate
to the oven cavity.
4) Remove the fan motor ASS’Y to the upper plate.
I. HIGH VOLTAGE CAPACITOR, H.V. FUSE
TRANSFORMER AND DIODE REMOVAL
1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from H.V. transformer, MGT,
H.V. Fuse and H.V. capacitor.
3) Remove the screw holding the H.V. transformer and
remove the high voltage diode earth screw.
J. REMOVING THE TURNTABLE MOTOR
1) Remove the metal tray.
2) Remove the turntable shaft VERY CAREFULLY.
3) Lay the unit down on its back.
4) Remove the turntable motor cover.
The turntable base cover is easily removed by
pinching the six parts with a wire cutting.
5) Disconnect the leadwire from the turntable motor
terminals.
6) Remove the screw securing the turntable motor to
the oven cavity Ass’y.
7) After repairing the motor, rotate the removed
turntable motor cover.
8) Fit the turntable motor cover’s projecting part to the
base plate slit and fasten a screw.
NOTE:
1. Remove the wire lead from the turntable motor
VERY CAREFULLY.
2. Be sure to grasp the connector, not the wires, when
removing.
H.V.
Transformer
H.V. Fuse
Fan Motoer Assembly
BKT H.V.C
H.V. Diode
H.V.
Capacitor
Wire Leads
Turntable Motor

K. C-MOTOR, THERMISTOR
REMOVAL
1) Remove air-guide and controller assembly upper.
2) Disconnect the leadwire from the circulation motor
terminal and oven thermostat.
3) Remove the screws of the thermistor, guide assy-
chamber and lift up the guide assy-chamber.
4) Remove a hex nut securing the circulation fan to
shaft of the C-motor.
5) Remove screws securing the motor shaft to the
guide assy-chamber.
6) Remove hex nut securing the C-motor to the motor
shaft.
L. PCB ASSEMBLY REMOVAL
1) Remove the control panel assembly from the
cavity. (Refer to control panel assembly removal
on previous page.)
2) Remove screws which hold the PCB SUB ASS’Y to
the PCB holder.
3) Remove the PCB holder & PCB Bracket.
4) Remove screws which hold the control panel.
5) Disconnect the flat cable from the PCB SUB
ASS’Y and take off the PCB SUB ASS’Y.
M. INTERLOCK SYSTEM
1) INTERLOCK MECHANISM
The door lock mechanism is a device which has
been specially designed to eliminate microwave
activity when the door is opened during cooking
and thus to prevent the danger resulting from the
microwave leakage.
2)
MOUNTING OF THE PRIMARY/MONITOR/
SECONDARY SWITCHES TO THE LATCH BOARD
3) INSTALLATION AND ADJUSTMENT OF THE
LATCH BOARD TO THE OVEN ASSEMBLY
•Mount the latch board to the oven assembly.
•Adjust the latch board in the arrow direction so that
oven door will not have any play in it when the door
is closed.
•Tighten the mounting screw.
5-6
Circulation Motor
Oven Thermostat
Thermistor
Control Panel
PCB Holder
PCB Bracket PCB Sub (Main)
Button
Indicate
Deco.
PCB Sub
(Tact S/W)
ADJUSTMENT
DIRECTION
SECONDARY
SWITCH
PRIMARY
SWITCH
Right Left
MONITOR
SWITCH

5-7
N. UPPER HEATER REMOVAL
1) Remove the screw securing the air-guide to the
upper.
2) Disconnect the leadwire from the sheath heater
and main wire connector.
3) Remove the screws of the chamber-U.
4) Remove the chamber-U, air-tunnel-U.
5) Remove the screw securing of the reflector to
sheath heater.
6) Remove the sheath heater from reflector.
7) Remove the screw securing of the heater
support-F, B to reflector.
8) Remove the heater support-F, B of reflector.
9) Disconnect the leadwire from ceramic heater.
10) Remove the ceramic heater and halogen heater.
O. LOWER HEATER REMOVAL
1) Disconnect the leadwire from the sheath heater.
2) Remove the base plate from cavity.
3) Remove the nuts from the oven cavity of the side.
4) Remove the Gasket, Ring and Heater Bracket.
5) Remove the sheath heater in the oven cavity.
Chamber-U
Air-Tunnel-U
Upper Sheath Heater
Ceramic
Heater
Halogen
Heater
Support-F
Support-B
Reflector
Insulator-U
Lower Sheath Heater
Gasket
Ring
Heater Bracket

A. PRIMARY INTERLOCK SWITCH TEST
When the door release button is depressed slowly
with the door closed, an audible click should be
heard at the same time or successively at
intervals. When the button is released slowly, the
latches should activate the switches with an
audible click.
If the latches do not activate the switches when
the door is closed, the switches should be a
adjusted in accordance with the adjustment
procedure. Disconnect the wire lead from the
primary switch. Connect the ohmmeter leads to
the common (COM) and normally open (NO)
terminal of the switch. The meter should indicate
an open circuit in the door open condition.
When the door is closed, the meter should
indicate a closed circuit.
When the primary switch operation is abnormal,
make the necessary adjustment or replace the
switch only with the same type of switch.
B. SECONDARY INTERLOCK SWITCH TEST
Disconnect the wire lead from the secondary
switch.
Connect the ohmmeter leads to the common
(COM) and normally open (NO) terminals of the
switch. The meter should indicate a open circuit in
the door open condition. When the door is closed,
meter should indicate an closed circuit. When the
secondary switch operation is abnormal, make
the necessary adjustment or replace the switch
only with the same type of switch.
C. MONITOR SWITCH TEST
Disconnect the wire lead from the monitor switch.
Connect the ohmmeter leads to the common
(COM) and normally closed (NC) terminals of the
switch. The meter should indicate closed circuit in
the door open condition. When the door is closed,
meter should indicate an open circuit. When the
monitor switch operation is abnormal, replace with
the same type of switch.
NOTE: After repairing the door or the interlock
system, it is necessary to do this continuity
test before operating the oven.
5-8
WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION
EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS.
TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH
TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH
TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH
COMPONENTS TEST PROCEDURE RESULTS
SWITCHES Check for continuity of the switch Door Door
(Wire leads removed) with a Multi-meter open close
Primary
Switch
Monitor
Switch
NOTE : After checking for the continuity of switches, make sure that are
correctly connected.
COM
NO
COM
NO
NC
COM
Secondary
Switch
INTERLOCK CONTINUITY TEST

COMPONENT TEST PROCEDURE
5-9
CAUTIONS
1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE
OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH
VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE
HIGH VOLTAGE TRANSFORMER. (SEE PAGE 2-1)
2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER
OF WATER IN CONTAINER) IN THE OVEN.
COMPONENTS TEST PROCEDURE RESULTS
HIGH VOLTAGE
TRANSFORMER
(Wire leads removed)
MAGNETRON
(Wire leads removed)
1. Measure the resistance.
(Ohm-meter scale: Rx1 and Rx100)
•Primary winding
•Secondary winding
•Filament winding
2. Measure the resistance.
(Ohm-meter scale: Rx1000)
•Primary winding to ground
•Filament winding to ground
1. Measure the resistance.
(Ohm-meter scale: Rx1)
•Filament terminal
2. Measure the resistance.
(Ohm-meter scale: Rx1000)
•Filament to chassis
Approx.: 1.66 ohm
Approx.: 99.5 ohm
Less than: 1 ohm
Normal: Infinite
Normal: Infinite
Normal: Less than 1 ohm
Normal: Infinite
PRIMARY
TERMINAL
SECONDARY
TERMINAL
FILAMENT
WINDING
TERMINAL

5-10
COMPONENTS TEST PROCEDURE RESULTS
HIGH VOLTAGE
CAPACITOR
HIGH VOLTAGE
DIODE
NOTE :
Some inexpensive meters
may indicate infinite
resistance in both direction.
Measure the resistance.
(Ohm-meter scale: Rx1000)
•Terminal to terminal.
Measure the resistance.
(Ohm-meter scale: Rx1000)
•Terminal to case.
Measure the continuity (Forward).
(Ohm-meter scale: Rx10000)
Measure the continuity (Reverse).
(Ohm-meter scale: Rx10000)
Normal: Momentarily indicates
several ohms, and then
gradually returns to
infinite.
Normal: Infinite.
Normal: Continuity.
Abnormal: Infinite.
Normal: Infinite.
Abnormal: Continuity.
NOTE: When testing the magnetron, be sure to install the magnetron gasket
in the correct position and be sure that the gasket is in good condition.
Antenna
Gasket
Chassis
Filament