LG MC-784DC User manual

MICROWAVE/GRILL/
CONVECTION OVEN
SERVICE MANUAL
MODEL : MC-784DC/MC-785DC/MC-785BC
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS
IN THIS MANUAL.

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.
SAFETY PRECAUTIONS
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 should be performed on each oven prior to release to the owner.
CAUTION
MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE
GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.

TABLE OF CONTENTS
3
(Page)
SAFETY PRECAUTIONS ................................................................................................. Inside front cover
SPECIFICATIONS ........................................................................................................................................ 4
CAUTIONS .................................................................................................................................................... 5
INSTALLATIONS .......................................................................................................................................... 6
OPERATING INSTRUCTIONS ..................................................................................................................... 7
FEATURES .............................................................................................................................................. 7
CONTROL PANEL ................................................................................................................................... 7
OPERATING SEQUENCE ....................................................................................................................... 8
SCHEMATIC DIAGRAM ............................................................................................................................... 9
CIRCUIT DESCRIPTION ....................................................................................................................... 10
SERVICE INFORMATION .......................................................................................................................... 11
TOOLS AND MEASURING INSTRUMENTS ......................................................................................... 11
MICROWAVE LEAKAGE TEST ............................................................................................................. 11
MEASUREMENT OF MICROWAVE POWER OUTPUT ........................................................................ 13
DISASSEMBLY AND ADJUSTMENT.......................................................................................................13
INTERLOCK CONTINUITY TEST .......................................................................................................... 17
COMPONENT TEST PROCEDURE ...................................................................................................... 18
TROUBLE SHOOTING GUIDE .............................................................................................................. 23
EXPLODED VIEW ...................................................................................................................................... 29
REPLACEMENT PART LIST ...................................................................................................................... 36
MICOM CONTROLLER SCHEMATIC DIAGRAM ...................................................................................... 39
MICOM CONTROLLER P.C.B LAYOUT ..................................................................................................... 40
TACT SWITCH BUTTON POSITION........................................................................................................... 41
MICOM CONTROLLER P.C.B PARTS LIST .............................................................................................. 42
PACKING AND ACCESSORIES ............................................................................................................... 45

SPECIFICATIONS
4
ITEM DESCRIPTION
MODEL MC-785DC / MC-784DC MC-785BC
Power Requirement 230V AC50Hz
Single phase, 3 wire grounded
Microwave 1350W
Grill 1250W
Convection 1350W (MAX. 2550W)
Combination 2650W
Power Output 850W full microwave power(IEC705)
Microwave Frequency 2,450MHz
Magnetron 2M214 - 39F, 2M254J, 2M218J
Timer 99min. 90sec.
Outside Dimensions 530(W) ✕ 322 ✕ 497mm
Cavity Dimensions 348(W) ✕232 ✕374mm
Net Weight 22.5kg(approx.) 23.0kg
Shipping weight 25.0kg(approx.) 25.5kg
Control Complement Microwave Power for Variable Cooking
Power level
HIGH...............................................Full power throughout the cooking time(100%)
MED-HIGH .....................................approx. 80% of Full power
MEDIUM.........................................approx. 60% of Full power
DEFROST ......................................approx. 40% of Full power
LOW ...............................................approx. 20% of Full power
• Convection - Max. 250°C
• Grill
• Combination
Name plate Location
Accessories Owner's manual Glass turntable
Rotating ring Convection rack
Grill rack Metal tray
Roti-Bar MC-785BC ONLY
Roti-Handle
This microwave oven is designed for household use only.
It is not recommended for commercial purpose.
Back Side

●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 stop, an electric
charge remains on the high voltage capacitor. When
replacing or checking, you must discharge the
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 damage the door seal or 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 .
5
CAUTIONS
Unlike other appliances, the microwave oven is
high-voltage and high-current appliance.
Though it is free from danger in ordinary use,
extreme care should be taken during repair.
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 connected.
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.
ANTENNA
GASKET
FILAMENT
TERMINAL
COOLING FIN
MAGNETRON
CHASSIS
GROUND
THE OVEN IS TO BE SERVICED ONLY
BY PROPERLY QUALIFIED SERVICE
PERSONNEL.
MAGNETRON

Installing microwave oven
1. Empty the microwave 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, food and utensils
you put in it. (The control panel side of the oven is
the heavy side. 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 microwave oven in an ambient temperature
of less than 104°F (40°C).
6. Place the microwave oven on a sturdy and flat
surface, at least 10cm(4 inches) from the wall.
7. Place the microwave oven as far away as possible
from TV, RADIO, COMPUTER etc, to prevent
interference.
8. This oven must be plugged into a 15A outlet.
9. Do not touch the front glass during or after cooking
of the Grill, Convection and Combination mode.
This glass is very hot during heater operating.
10. Do not operate oven at microwave and combination
mode with the Convection rack or Grill rack placed
in the cavity when the oven is empty.
Earthing Instructions
This microwave 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 colours of the wires in the mains lead of this
appliance may not correspond with the coloured
markings identifying the terminals in your plug, proceed
as follows.
The wire which is coloured green-and-yellow must be
connected to the terminal in the plug which is marked
with the letter Eor by the earth symbol (bb)or coloured
green or green-and yellow.
The wire which is coloured blue must be connected to
the terminal in the plug which is marked with the letter N
or coloured black.
The wire which is coloured brown must be connected to
the terminal in the plug which is marked with the letter L
or coloured red.
6
INSTALLATIONS
BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.
The wires in this mains lead are coloured in
accordance with the following code:
Green-and-yellow: Earth
Blue: Neutral
Brown: Live

OPERATING INSTRUCTIONS
7
1. DISPLAY WINDOW
Used to show :
Time of day
Cooking of day
Cooking power level
Cooking category
2. AUTO WEIGHT
DEFROST
To select auto weight
defrost.
3. COMBINATION
To select combination
cooking.
4. CONVECTION
To select convection
cooking.
5. Grill
To select grill cooking.
6. MICRO POWER
To select micro power
cooking and cooking
power levels.
7. CLOCK
To set the time of day.
8. STOP/CLEAR
Stops the oven and clear
all entries except the time
of day.
9. CHILD LOCK
10. AUTO COOK
To select auto cook.
11. MORE/LESS
To select convection
temperature, and change
auto cook time and auto
reheat time.
12. WEIGHT
To set weight of food
auto weight defrost.
13. TIME
To set cooking times.
14. QUICK START/START
To quickly set the
cooking time directly.
Window door screen
Control panel
Oven front face
Door seal
Glass turntable
Rotating ring
Latch Shaft
Metal tray
Convection rackGrill rack
ROTI-BAR
FOR MC-785BC ONLY
ROTI-HANDLE
6
3
7
12 14
8,9
11
4
5
10
13
2
1
1 Jacket Potato
2 Rice/Pasta
3
Fresh Vegetable
4 Frozen Vegetable
5 Chilled Pizza
6 Frozen Pizza
7 French Fries
8 Gratin
9 Roast Beef
10 Roast Pork
11
Whole Chicken
12 Chicken Legs
1 meat
2 poultry
3 fish
4 bread
Start
Auto Cook
Quick
Function
more less
Auto Weight Defrost Stop/Clear
Menu
Weight
Time
Clock
Defrost Auto Weight ˚C
1
10
Power Grill
Combination
Convection
Start
Micro Grill
Combination Convection
Features
Control Panel
NOTE : A beep sounds when a pad on the control panel
is touched, to indicate a setting has been entered.

Operating Sequence
8
The following is a description of component functions
during oven operation.
PLUG THE POWER
CORD INTO AN
ELECTRIC OUTLET CLOCK SET THE
CORRECT
HOUR
SET THE
CORRECT
MINUTE CLOCK
STOP/CLEAR DESIRED
POWER
LEVEL
DESIRED
COOKING
TIME START
STOP/CLEAR DESIRED
DEFROST
CATEGORY
DESIRED
COOKING
WEIGHT START
DESIRED
POWER
LEVEL
DESIRED
COOKING
TIME
DESIRED
POWER
LEVEL START
DESIRED
COOKING
TIME
Stage 1
Stage 2
GRILL OR
CONVECTION OR
COMBINATION
DESIRED
COOKING
TIME
STOP/CLEAR DESIRED
COOKING
TIME START
1. Setting the clock
2. Cooking (MICROWAVE POWER)
3. Multi Stage Cooking
4. Grill Cooking
5. Convection Cooking
STOP/CLEAR DESIRED
CONVECTION TEMP
(150°C~200°C) START
GRILL
DESIRED
CONVECTION TEMP
(150°C~250°C)
GRILL
OR
6. Combination Cooking
START
DESIRED
COOKING
TIME
STOP/CLEAR DESIRED
CONVECTION TEMP
(150°C~250°C) START
DESIRED
COOKING
TIME
7. Auto Weight Defrost
8. Auto Cook
9. Child Lock
10. Quick Start
11. More and Less
STOP/CLEAR DESIRED
COOKING
WEIGHT START
STOP/CLEAR STOP/CLEAR
(Touch and Hold)
STOP/CLEAR STOP/CLEAR
(Touch and Hold)
START STOP/CLEAR
LESS
START
OR
PROGRAMME
DESIRED
AUTO COOK
AND
CONVECTION
MODE
STOP/CLEAR MORE
DESIRED
AUTO COOK
CATEGORY
DESIRED POWER
LEVEL
(20%,40% or 60%)
OR
STOP/CLEAR
COMBINATION
Conditions Beep sound
• Function button touched. —
• Cooking stage changed. — —
• End of cooking — — —
• Error — — —
• Pass by half at auto weight defrost — — — — —
To Pre - Heat
To Cook
NOTE : Beep Sound
• The beep sound is activated under the following
condition.
This oven has a CHILD LOCK feature.
To Set CHILD LOCK
"L" appears on the display and you can't input any key.
To Cancel CHILD LOCK

SCHEMATIC DIAGRAM
9
MICROWAVE
GRILL/CONV. OVEN
DIAGRAM SCHEMATIC
PRIMARY
SWITCH
BN RD RD
NO
MONITOR
SWITCH
COM
7654321
OVEN
THERMOSTAT
MAGNETRON
THERMOSTAT
BL BL
N
L
O.L F.M T.T.M
YLYL
WH
BN WH RD
10A
NOISE
FILTER
G - Y
INPUT
POWER
POWER
TRANS
1
2
3
123
GN
GN SECONDARY
SWITCH
PK
WH
WH
MAGNETRON
H.V DIODE
CAPACITOR
H.V
H.V
FUSE
0.8A
RD RD
RD
FFA
BL
BLBL
NC
BN
BL
RD RD
WH
SOLENOID
YL
BL
WH
RD
RD
RD
TRANSFORMER
RELAY 1
GRILL HEATER
YL
CONVECTION HEATER RELAY 5
RELAY 2
230VAC
24VAC
COM.
YL
RELAY 4 RELAY 3
YL
WH
YL
RD
THERMISTOR
PCB
ACHTUNG Hochspannungskondesator vor allen
Servicearbeiten gegen Masse entladen.!!
AVANT INTERVENTION TECHNIQUE, DECONNECTER ET
DECHARGER LA CAPACITE DE HAUT VOLTAGE.
BEFORE SERVICNG Discharge the high voitage
Capacitor by shorting the negative high voltage
Terminal of it to chassis ground.
*NOTE:DOOR IS CLOSE.
BN:BROWN BL:BLUE YL:YELLOW
RD:RED WH:WHITE PK:PINK
G-Y:GREEN AND YELLOWSTRIPED.
F.M:FAN MOTOR
O.L:OVEN LAMP
T.T.M: TURN TABLE MOTOR
C.M:CIRCULATION MOTOR
C.M
RD
P/NO.3854W3A270A
PRIMARY
SWITCH
BN RD RD
NO
MONITOR
SWITCH
COM
7654321
OVEN
THERMOSTAT
MAGNETRON
THERMOSTAT
BL BL
N
L
O.L F.M T.T.M
YLYL
WH
BN WH RD
10A
NOISE
FILTER
G - Y
INPUT
POWER
POWER
TRANS
1
2
3
123
GN
GN SECONDARY
SWITCH
PK
WH
WH
MAGNETRON
H.V DIODE
CAPACITOR
H.V
H.V
FUSE
0.8A
RD RD
RD
FFA
BL
BLBL
NC
BN
BL
RD RD
WH
SOLENOID
YL
BL
WH
RD
RD
RD
TRANSFORMER
RELAY 1
GRILL HEATER
YL
CONVECTION HEATER RELAY 5
RELAY 2
230VAC
24VAC
COM.
YL
RELAY 4 RELAY 3
YL
WH
YL
RD
THERMISTOR
PCB
ACHTUNG Hochspannungskondesator vor allen
Servicearbeiten gegen Masse entladen.!!
AVANT INTERVENTION TECHNIQUE, DECONNECTER ET
DECHARGER LA CAPACITE DE HAUT VOLTAGE.
BEFORE SERVICNG Discharge the high voitage
Capacitor by shorting the negative high voltage
Terminal of it to chassis ground.
*NOTE:DOOR IS CLOSE.
BN:BROWN BL:BLUE YL:YELLOW
RD:RED WH:WHITE PK:PINK
G-Y:GREEN AND YELLOWSTRIPED.
F.M:FAN MOTOR
O.L:OVEN LAMP
T.T.M: TURN TABLE MOTOR
C.M:CIRCULATION MOTOR
C.M
RD
P/NO.3854W3A269A
R.M
RD
YL
R.M:ROTISSERIE MOTOR
H.V
H.V
MODEL:MC-785DC
MODEL:MC-785BC
MC-784DC

●As the door is closed, the contact of MONITOR
SWITCH opens. This switch creates the short circuit to
blow 10 A fuse during operation under abnormal
condition.(ie, should the contacts of primary fail to
open the circuit)
●The latches are secured by latch board. The oven light
turns on while the oven is in operation.
WHEN COOKING POWER LEVEL AND
COOKING TIME ARE SET
●The contacts of the primary switch and the secondary
switch close the circuit.
●230V A.C. is applied to the high voltage transformer
through power control switch as shown by the solid
line.
●Turntable and circulation motor rotate.
●The fan motor rotates and cools the magnetron by
blowing the air (coming from the intake on the
backplate) over the magnetron.
●The air is also directed into the oven to exhaust the
vapor in the oven through the base plate and back
plate.
●3.5V A.C. is generated from the filament winding of the
high voltage transformer. This 3.5V is applied to the
magnetron to heat the magnetron filament through two
noise preventing choke coils. A high voltage of
approximately 2100V A.C. is generated in the
secondary of the high voltage transformer which is
increased by the action of the diode and charging of
the high voltage capacitor. The negative D.C. voltage
is then applied to the filament of the magnetron.
WHEN THE DOOR IS OPEN DURING
COOKING
●Both primary switch and secondary switch open to cut
off the primary winding voltage to the high voltage
transformer to stop microwave oscillation.
●Turntable and fan motor stop.
●As the door is opened, if the contact of primary switch
fail to open, the 10A fuse opens due to the large
current surge caused by the monitor switch activation
which in turn stops magnetron, oscillation.
WHEN TOUCHING THE START KEY
WITH THE CONVECTION/GRILL
COOKING FUNCTION SELECTED.
●The contacts of the primary switch and the secondary
switch close the circuit.
●230V A.C. is applied to the grill heater through grill
thermostat as shown by the solid line.
●Turntable rotate.
●The fan motor and circulation motor rotate.
●The air is also directed into the oven to exhaust the
vapor in the oven through the base plate and back
plate.
Circuit Description
10
FUSE
10A
PRIMARY
SWITCH
N
L
RELAY 1
H.V.T
MONITOR
SWITCH
FUSE
10A
PRIMARY
SWITCH
N
L
RELAY 1
H.V.T
MONITOR
SWITCH
FUSE
CONVECTION
HEATER
RELAY 2
L
N
E
N
LG-Y
RELAY 5
GRILL
HEATER
OVEN THERMOSTAT
FUSE
L
N
E
N
LG-Y
RELAY 5
GRILL
HEATER
OVEN THERMOSTAT

INTRODUCTION
29
EXPLODED VIEW
DOOR PARTS
CONTROL PANEL PARTS
LATCH BOARD PARTS
BASE PARTS
INTERIOR PARTS
OVEN CAVITY PARTS

DOOR PARTS
30
13581A
14890A
13720D
13213A
13552A
14026A
14970A
13806F
54974A

CONTROL PANEL PARTS
31
24781S
23572A
23806C 24351A
250201
268712 268711
250202
250203
249401
250204

OVEN CAVITY PARTS
32
33052M
33112U
34960A
36549S
33390M
33390G
34371T
35889A
54974A
WTT010
35301A
WTT021
348102
33550H 348101
35300A
WMT002
WTT021
WSZ002
WTP013
WTT011 35026G
35026C
34774U
34036W 34271A
WTP013
For MC-785BC ONLY
34810R WTT011
34370Z 36549R
(Only MC-785BC)
34930R

LATCH BOARD PARTS
33
43501A
466001
43500A
466003
466002
WSZ085

INTERIOR PARTS
34
53551S
56201A
50FZZA
56549F
56930V
53504A
55900N
36549C
56322V
56208A
54975G
35300S
56411A
54974S
50CZZH
54810C
568771
56851D
56851C
568772
WWS005
WWP008
WNH003
54350A
WTT028 WTT028
WTT028
WTT037
WTT028
368771
WSZ062
WTT028
WMT002
WSZ002
WNH002
55900C
WSZ002
WSZ002
56912B
56021A
56930M
55262A
54370D
54810U
54970A
54932A
56324A
55900A

35
BASE PLATE PARTS
63303A
63302A
647781
56170D
34774L
WSZ085
WSZ062 WSZ002
WTT030
948501
948504

NECESSARY TOOLS
Tools normally used for TV servicing are sufficient.
Standard tools are listed below.
●Diagonal pliers
●Long nose pliers
●Cross head screwdriver
●Wrench (size 5 mm)
●Nutdriver (size 5 mm)
●Adjustable wrench
●Soldering iron
●Solder
●Vinyl insulation tape
●Polishing cloth
CAUTIONS
●Be sure to check a microwave emission prior to
servicing the oven if the oven is operative prior to
servicing.
●If the oven operates with door open, the service
personnel should;
—Tell the user not to operate the oven
●The service personnel should check all surface and
vent openings for microwave emission testing.
●Check for microwave energy leakage after every
servicing. The power density of the microwave
radiation leakage emitted by the microwave oven
should not exceed 4 mW/cm2.
And always start measuring of an unknown field to
assure safety for operating personnel from radiation
leakage.
NOTE: The standard is 5 mW/cm2while in the
customer’s home. 4 mW/cm2stated here is
manufacturer’s own voluntary standard for units in
customer’s home.
EQUIPMENT
●Microwave Survey Meter
●600cc glass beaker
●Glass thermometer 100°C
NECESSARY MEASURING
INSTRUMENTS
●TESTER (VOLTS-DC, AC, Multmeter)
●Microwave survey meter
—Holaday H1-1500, Hi-1501
—Narda 8100, 8200
●Inch scale
●600 cc non conductive material beaker (glass or
plastic), inside diameter: approx. 8.5cm (31/2in.)
●Cylindrical and made of borosilicate glass vessel max.
thickness: 3mm
outside diameter: approx. 190mm
height: approx. 90mm
●Glass thermometer: 100°C or 212°F (1 deg scale)
MEASURING MICROWAVE ENERGY
LEAKAGE
●Pour 275 ± 15cc of 20°C ± 5°C 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.
Tools and Measuring Instruments
11
Microwave Leakage Test
SERVICE INFORMATION
Move probe along shaded area.
Probe scanning speed;
Less than 2.5 cm/sec

MEASUREMENT WITH THE OUTER
CASE REMOVED
●When you replace the magnetron, measure microwave
energy leakage before the out case is installed and
after all necessary components are replaced or
adjusted.
Special care should be taken in measuring the
following parts. (Shaded 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.
NOTES:
Leakage with the outer case removed - less than
5 mW/cm2.
Leakage for a fully assembled oven (“Before the latch
switch (primary) is interrupted”) with the door in a slightly
opened position - less than 4 mW/cm2.
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.
●Should the microwave energy leakage not be more
than 4 mW/cm2after 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
manufacture.
12
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 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.
A. OUT CASE REMOVAL
1) Disconnect power supply cord from the outlet.
2) Remove the screws from the rear and side section.
The out case must be moved backward to the lifted off.
B. POWER SUPPLY CORD
1) Remove the out case.
2) Disconnect two terminals from the noise filter assy
and remove one screw of the earth terminal.
CAUTION: DISCHARGE HIGH VOLTAGE
CAPACITOR BEFORE SERVICING
(refer to page 5)
C. DOOR GROSS ASSEMBLY
REMOVAL
1) Remove screws of the oven hinge plate-L.
2) Open door and remove door assembly from hinge
plate-U.
NOTES
1. After replacing the door, be sure to check that the
primary switch, monitor switch and secondary switch
operates normally.
●The microwave power output P in watts is calculated
from the following formula:
P =
is measured while the microwave generator is
operating at full power. Magnetron filament heat-up
time is not included. (about 2 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.
2. After replacing the door, check for microwave energy
leakage with a survey meter.
Microwave energy must be below the limit of
4mW/cm2.,(With a 275ml water load).
Measurement of Microwave Power Output
13
Disassembly and Adjustment
Water Load
Turn Table
HINGE PLATE-U
HINGE PLATE-L
4187✕(∆T)
T