LG MS-0742SG User manual

P/NO : 3828W5S4049 April, 2004
Printed in Korea
MIC OWAVE OVEN
SERVICE MANUAL
MODEL: MS-0742SG
CAUTION
BEFO E SE VICING THE UNIT, EAD THE
SAFETY P ECAUTIONS IN THIS MANUAL.
website http://bi .lgservice.com

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

(Page)
SAFETY PRECAUTIONS --------------------------------------------------------------------- Inside front cover
SPECIFICATIONS
----------------------------------------------------------------------------------------------------- 1-1
CAUTIONS
-------------------------------------------------------------------------------------------------------------- 2-1
INSTALLATIONS
------------------------------------------------------------------------------------------------------ 3-1
OPERATING INSTRUCTIONS
------------------------------------------------------------------------------------ 4-1
FEATU ES ------------------------------------------------------------------------------------------------------------------------ 4-1
CONT OL PANEL -------------------------------------------------------------------------------------------------------------
4-1
OPE ATING SEQUENCE
---------------------------------------------------------------------------------------------------- 4-2
SCHEMATIC DIAG AM ------------------------------------------------------------------------------------------------------ 4-3
CI CUIT DESC IPTION ----------------------------------------------------------------------------------------------------- 4-4
SERVICE INFORMATION ------------------------------------------------------------------------------------------ 5-1
TOOLS AND MEASU ING INST UMENTS ---------------------------------------------------------------------------
5-1
MIC OWAVE LEAKAGE TEST
-------------------------------------------------------------------------------------------- 5-1
MEASU EMENT OF MIC OWAVE POWE OUTPUT ----------------------------------------------------------- 5-3
DISASSEMBLY AND ADJUSTMENT -------------------------------------------------------------------------------------
5-3
INTE LOCK CONTINUITY TEST
------------------------------------------------------------------------------------------ 5-7
COMPONENT TEST P OCEDU E -------------------------------------------------------------------------------------- 5-8
T OUBLE SHOOTING ------------------------------------------------------------------------------------------------------ 5-11
EXPLODED VIEW ----------------------------------------------------------------------------------------------------- 6-1
REPLACEMENT PARTS LIST
------------------------------------------------------------------------------------ 7-1
SCHEMATIC DIAGRAM OF P.C.B.
------------------------------------------------------------------------------ 8-1
P INTED CI CUIT BOA D ------------------------------------------------------------------------------------------------- 8-2
P.C.B. PARTS LIST --------------------------------------------------------------------------------------------------- 9-1
CONTENTS

This microwave oven is designed for household use only.
It is not recommended for commercial purposes.
ITEM
MODEL
Power equirement
Power Output
Microwave Frequency
Magnetron
Timer
Outside Dimensions
Cavity Dimensions
Net Weight
Shipping weight
Control Complement
Nameplate Location
Accessories
DESCRIPTION
MS-0742SG
120 Volts AC 60 Hz
1,000 Watts (8.5A)
Single phase, 3 wire grounded
700 Watts full microwave power (IEC60705)
2,450 MHz
2M213-240GP
0 ~ 99 min. 99 sec.
455 (W) x 284 (H) x 320 (D)
327 (W) x 202 (H) x 286 (D)
11.2 kg (approx.)
12.2 kg (approx.)
Touch Control System
Clock : 1:00 - 12:59
Microwave Power for Variable Cooking
Power level
HIGH ------------------------------------------ Full power throughout the cooking time
9 (Saute)--------- approx. 90% of Full power, 8 ( eheat)------------- approx. 80%
7 (Med.-High)--------------------- approx. 70%, 6 (Medium)------------ approx. 60%
5 (Med.-Low) --------------------- approx. 50%, 4 (Defrost)------------- approx. 40%
3 (Low)----------------------------- approx. 30%, 2 (Simmer) ------------ approx. 20%
1 (Warm)--------------------------- approx. 10%
Owner's manual
Glass turntable
Back Side
1-1
SPECIFICATIONS

• DO NOT operate on a 2-wire extension cord during
repair and use.
• NEVER TOUCH any o en components or wiring during
operation.
• BEFORE TOUCHING any parts of the o en, always
remo e the power plug from the outlet.
• For about 30 seconds after the o en stops, an electric
charge remains in the high oltage capacitor. When
replacing or checking, you must discharge the high
oltage capacitor by shorting across the two terminals
with an insulated screwdri er.
• Remo e your watches whene er working close to or
replacing the Magnetron.
• DO NOT touch any parts of the control panel circuit. A
resulting static electric discharge may damage this
P.C.B.
• NEVER operate the o en with no load.
• NEVER injure the door seal and front plate of the o en
ca ity.
• NEVER put iron tools on the magnetron.
• NEVER put anything into the latch hole and the
interlock switches area.
• Proper operation of the microwa e o en requires that
the magnetron be assembled to the wa eguide and
ca ity. Ne er 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 microwa e o en is
high- oltage and high-current equipment.
Though it is free from danger in ordinary use,
extreme care should be taken during repair.
THE OVEN S TO BE SERV CED ONLY
BY PROPERLY QUAL F ED SERV CE
PERSONNEL.
M CROWAVE RAD AT ON
Personnel should not be exposed to the
microwa e energy which may radiate from the
magnetron or other microwa e generating
de ice if it is improperly used or connection.
All input and output microwa e connections,
wa eguide, flange, and gasket must be secure
ne er operate the de ice without a microwa e
energy absorbing load attached.
Ne er look into an open wa eguide or antenna
while the de ice is energized.
Gasket
ANTENNA
COOLING FIN
MAGNETRON
CHASSIS GROUND
FILAMENT
TERMINALS
MAGNETRON

INSTALLATIONS
3-1
NSTALL NG
1. Empty the microwa e o en and clean inside it with
a soft, damp cloth. Check for damage such as
misaligned door, damage around the door or dents
inside the ca ity or on the exterior.
2. Put the o en on a counter, table, or shelf that is
strong enough to hold the o en and the food and
utensils you put in it. (The control panel side of the
o en is the hea y side. Use care when handling.)
3. Do not block the ent and the air intake openings.
Blocking ent or air intake openings can cause
damage to the o en and poor cooking results.
Make sure the microwa e o en legs are in place to
ensure proper air flow.
4. The o en 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 o en next to a con entional
surface unit or abo e a con entional wall o en.
5. Use microwa e o en in an ambient temperature
less than 104°F(40°C).
6. Place the microwa e o en on a sturdy and flat
surface at least 10 cm(4 inches) from the wall.
7. Place the microwa e o en as far away as possible
from TV, RADIO, COMPUTER, etc., to pre ent
interference.
GROUND NG NSTRUCT ONS
For personal safety, this appliance must be fully
grounded at all times.
In the e ent of an electrical short circuit, grounding
reduces the risk of electrical shock.
The plug must be plugged into an outlet that is
properly installed and grounded.
BEFORE YOU BEG N, READ THE FOLLOW NG NSTRUCT ONS COMPLETELY AND CAREFULLY.
10cm
WARN NG
Improper use of the grounding plug can result in a
risk of electric shock.
Do not, under any circumstances, cut or remo e
the third ground prong from the power cord plug.
PREFERRED METHOD
INSURE PROPER GROUND
EXISTS BEFORE USE

FEATURES
CONTROL PANEL
1. INDICATORS
2. ONE TOUCH CONTROL: Used to cook the foods
listed by one touch.
3. CLOCK: Used to set the time of day.
4. AUTO DEFROST: Used to select the desired auto
weight defrost programmed with weight pad.
5. TIME: Used to cook food for a desired time.
6. NUMBER: Used to set for time of day, cooking time,
power level or defrost weight.
7. POWER: Used to select the desired power level for
cooking.
8. STOP/CLEAR: Used to stop oven and clear all
entries except time of day.
. START: One tap allows oven to begin functioning.
10. QUICK START
4-1
OPERATING INSTRUCTIONS
Oven ront Plate
Window Door Screen
Door Seal
Display Window
Control Panel
Safety Door Lock System
Turntable
Roller Rest
3
5
7
10
2
4
6
8
9
1

OPERATING SEQUENCE
The following is a description of component functions
during oven operation.
1. SETTING THE CLOCK
ex.) To set 4:30, touch number ke [4],[3], and [0].
NOTE: 1) This is a 12 hour clock.
2) Clock will operate as long as power is
applied to the oven.
2. CANCEL FUNCTION
Touch the pad whenever ou need to
cancel an entr or a function currentl in use.
The displa will either return to the last item entered
or to the clock.
3. Ez On
4. ONE TOUCH COOKING
NOTE: Heat onl 1 package at a time
5. TIME COOKING
6. MULTI-STAGE COOKING
7. AUTO DEFROST COOKING
8. CHILD LOCK
This oven has a CHILD LOCK feature
TO SET CHILD LOCK
• Touch the pad
• Touch and hold 0 pad L appear on
the displa .
TO CANCEL CHILD LOCK
• Touch the pad
• touch and hold 0 pad L disappear.
STOP/CLEAR CLOCK NUMBER
STOP/CLEAR POPCORN
STOP/CLEAR Ez On
STOP/CLEAR
1ST STAGE
1ST STAGE
CLOCK
STOP/CLEAR AUTO
DEFROST NUMBER OF WEIGHT START
STOP/CLEAR TIME NUMBER POWER
NUMBER START
STOP/CLEAR TIME NUMBER POWER
NUMBER
2ND STAGE
TIME NUMBER POWER
NUMBER START
0
0
4-2

SCHEMATIC DIAGRAM
4-3
IMPORTANT SAFETY NOTE: THE SHADED AREAS ON THIS SCHEMATIC DIAGRAM INCORPORATE SPECIAL FEATURES
IMPORTANT FOR PROTECTION FROM MICROWAVE RADIATION, FIRE, ELECTRICAL SHOCK, AND
HAZARDS. WHEN SERVICING IT IS ESSENTIAL THAT ONLY MANUFACTURER'S SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAGRAM.
NOTICE: SINCE THIS IS BASIC SCHEMATIC DIAGRAM, THE VALUES OF COMPONENTS AND
SOME PARTIAL CONNECTIONS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

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 PAD
• 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 2.
• Turntable rotates.
• The fan motor rotates and cools the magnetron by
blowing the air (coming from the intake on the
baseplate .
• 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 2 by the applied signal to vary the average output
power of microwave oven as POWER LEVEL.
(refer to page 1-1
• One complete cycle of relay 2 is 22 seconds.
WHEN THE DOOR IS OPENED DURING
COOKING
• Both the primary switch and relay 2 cut off the primary
winding voltage of the high voltage transformer.
• ON-OFF of relay 2 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 relay2 and/or secondary switch fail to open, the
fuse opens due to the large current surge caused by
the monitor switch activation, which in turn stops
magnetron oscillation.
4-4
FUSE
H.V.
TRANS-
FORMER
RELAY 2
MICOM CONTROLLER
SECONDARY
SWITCH
MONITOR
SWITCH
N
PRIMARY
SWITCH
L
FUSE
H.V.
TRANS-
FORMER
RELAY 2
MICOM CONTROLLER
SECONDARY
SWITCH
MONITOR
SWITCH
N
PRIMARY
SWITCH
L

CAUTIONS
• Be sure to check microwave leakage prior to
servici g the ove if the ove is operative prior to
servici g.
• The service perso el should i form the
ma ufacturer, importer, or assembler of a y
certified ove u it fou d to have a microwave
emissio level i 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 ove operates with the door ope , the service
perso el should:
- Tell the user ot to operate the ove .
- Co tact the ma ufacturer a d CDRH
(Ce ter for Devices a d Radiological Health)
immediately.
NOTE: Address o CDRH
Office of Compliance(HFZ-312
Center for Devices and Radiological
Healthe 1390, Piccard Drive,
Rockville. MD 20850
• 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 microwave 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 i a beaker
which is graduated to 600 cc, a d place the beaker
o the ce ter of the tur table.
• Set the e ergy leakage mo itor to 2,450 MHz a d
use it followi g the ma ufacturer's recomme ded
test procedure to assure correct result.
• Whe measuri g the leakage, always use the 2-
i ch (5cm) spacer supplied with the probe.
• Operate the ove at its maximum output.
• Measure the microwave radiatio usi g a d
electromag etic radiatio mo itor by holdi g the
probe perpe dicular to the surface bei g measured
Move probe alo g shaded area
Probe sca i g speed
Less tha 2.5 cm/sec
( 1i /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 Fig. below
- 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 removedless than
5 mW/cm.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/cm.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
horizontally along the oven surface; this may possibly
cause probe damage.
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/cm.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.
5-2
WARNING : AVOID CONTACTING ANY
HIGH VOLTAGE PARTS

• Microwave power output measurement is made with
the microwave oven supplied at its rated voltage and
operated at its maximum microwave power setting with
a load of (1000±5 g of 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 190mm.
• The oven and the empty vessel are at ambient
temperature prior to the start of the test.
• The initial temperature (T1 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
turntable 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
T
is measured while the microwave generator is
operating at full power. Magnetron filament heat-up
time is not included. (about 3 sec
• 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.
A. OUTER CASE REMOVAL
1 Disconnect the power supply cord from the outlet.
2 Remove the screws from the rear 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 ground terminal.
C. CONTROL PANEL ASSEMBLY
1 Open the door.
2 Remove the screws for the ground and securing the
control panel.
3 Disconnect the leadwire from RELAY(RY2 of the
PCB SUB ASS’Y.
4 Lift up and pull out control panel assembly carefully
from the cavity.
5 Disconnect the leadwire from connector(CN1 of the
PCB SUB ASS’Y.
CAUTION: DISCHARGE THE HIGH VOLTAGE
CAPACITOR BEFORE SERVICING
(Refer to page 2-1
5-3
WATER LOAD
TURNTABLE
securing screw
MEASUREMENT OF MICROWAVE POWER OUTPUT
P =
Remove the screw
Lift up and pull out control panel
DISASSEMBLY AND ADJUSTMENT

5-4
D. DOOR GROSS ASSEMBLY REMOVAL
1 Open the door.
2 Remove the choke cover very carefully with a
flat-blade screwdriver.
CAUTION : Be careful ot to damage door seal plate
by screwdriver.
3 Lift up and push the door.
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/cm. (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
1 Discharge the high voltage capacitor.
2 Disconnect the leadwire from magnetron, high voltage
transformer, and capacitor.
3 Remove the screw holding the high voltage
transformer to the baseplate.
F. FAN MOTOR ASSEMBLY REMOVAL
1 Discharge the high voltage capacitor.
2 Disconnect the leadwire from fan motor, and high
voltage capacitor.
3 Remove the two screws holding the the suction guide
ASS’Y to the oven cavity and remove the high voltage
diode earth screw.
4 Remove the two screws holding the fan motor ASS’Y
to the suction guide ASS’Y.
G. HIGH VOLTAGE CAPACITOR AND
DIODE REMOVAL
1 Discharge the high voltage capacitor.
2 Disconnect the leadwire from fan motor, and high
voltage capacitor.
3 Remove the screw holding the suction guide ASS’Y to
the oven cavity and remove the high voltage diode
earth screw.
4 Remove the screw holding the high voltage capacitor
bracket.
Remove choke cover
Remove door
H.V.
Transformer
Fan Motor ASS'Y
Suction
Guide
H.V.
Capacitor

5-5
H. AIR DUCT ASSEMBLY REMOVAL
1 Disconnect the leadwire from lamp.
2 Remove the mounting screw to Latch Board.
I. MAGNETRON REMOVAL
1 Disconnect the leadwire from the high voltage
transformer.
2 Carefully remove the mounting screws holding the
magnetron to the waveguide.
3 Remove the magnetron ASS’Y until the tube is
clear from the waveguide.
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
mag etro . To prevent microwave leakage,
tighten the mounting screws properly, making sure
there is no gap between the waveguide and the
magnetron.
J. REMOVING THE TURNTABLE MOTOR
1 Remove the turntable.
2 Remove the turntable shaft VERY CAREFULLY
with a slotted screwdriver.
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.
NOTE:
1. Remove the wire lead from the turntable motor
VERY CAREFULLY.
2. Be sure to grasp the connector, not the wires, when
removing.
Waveguide
Magnetron
Gasket
Magnetron
Dome
Waveguide
Bracket
Magnetron
Wire Leads
Turntable Motor

5-6
K. 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 control panel.
3 Disconnect the flat cable from the PCB SUB
ASS’Y and take off the PCB SUB ASS’Y.
L. INTERLOCK SYSTEM
1 INTERLOCK MECHANISM
The door lock mechanism is a device which has
been specially designed to eliminate completely
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.
• Check for play i the door by pushi g the door
release butto . Door moveme t should be less
tha 0.5 mm. (1/64 i ch)
Don't push the door release button while making
adjustment. Make sure that the latch moves
smoothly after adjustment are completed and that
the screws are tight. Make sure the primary, monitor,
and secondary switches operate properly by
following the continuity test procedure.
Key Membrane
Control Panel
PCB Sub Asm
PRIMARY
SWITCH
ADJUSTMENT
DIRECTION
MONITOR
SWITCH
SECONDARY
SWITCH

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 repairi g the door or the i terlock
system, it is ecessary to do this co ti uity
test before operati g the ove .
5-7
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 OR V-5230Q FOR PRIMARY SWITCH
TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF OR V-5220Q FOR MONITOR SWITCH
TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF OR V-5230Q FOR SECONDARY SWITCH
COMPONENTS TEST PROCEDURE RESULTS
SWITCHES Check for continuity of the Door Door
(Wire leads removed switch with an Ohm-meter open closed
Primary
Switch
Monitor
Switch
Secondary
Switch
NOTE : After checking for the continuity of switches, make sure that they are
connected correctly.
NO
COM
N
T
N
T
ADJUST
M
DIRECTI
O
N
T
NC
COM
NO
COM
INTERLOCK CONTINUITY TEST

5-8
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.: 0.3 ~ 0.8 ohm
Approx.: 100 ~ 200 ohm
Less than: 1 ohm
Normal: Infinite
Normal: Infinite
Normal: Less than 1 ohm
Normal: Infinite
SECONDARY
TERMINAL
PRIMARY
TERMINAL
FILAMENT
WINDING
TERMINAL
COMPONENT TEST PROCEDURE

5-9
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: Infinite.
Abnormal: Continuity.
Normal: Continuity.
Abnormal: Infinite.
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

5-10
COMPONENTS TEST PROCEDURE RESULTS
RELAY 2
FAN MOTOR
(Wire leads removed)
TURNTABLE
MOTOR
(Wire leads removed)
heck for continuity of relay 2 with an
ohm-meter.
(Remove wire leads from relay 2 and
operate the unit.)
Measure the resistance.
(Ohm-meter scale: R x 100)
Measure the resistance.
(Ohm-meter scale: R x 1000)
POWER
LEVEL
1 4 sec 18 sec
2 6 sec 16 sec
3 8 sec 14 sec
4 10 sec 12 sec
5 12 sec 10 sec
6 14 sec 8 sec
7 16 sec 6 sec
8 18 sec 4 sec
9 20 sec 2 sec
10 22 sec 0 sec
Normal:
A~B : Approx. 65 ~ 80 ohm
B~ : Approx. 10 ~ 30 ohm
A~ : Approx. 85 ~ 105 ohm
Abnormal: Infinite or several
ohm.
Normal: Approx. 100 ~ 150 ohm
Abnormal: Infinite or several
ohm.
NOTE : • A MI ROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS
SERVI ED FOR ANY REASON.
• MAKE SURE THE WIRE LEADS ARE IN THE ORRE T POSITION.
• WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE
ONNE TOR, NOT THE WIRES.
Relay 1
Relay 2
A(RD) B(BK)
(WH)