LG MC-7683D Manual de usuario
MIC OWAVE OVEN
SERVICE MANUAL
MODEL: MC-7683D
CAUTION
BEFO E SE VICING THE UNIT, EAD THE SAFETY P ECAUTIONS IN THIS MANUAL.
Website: http://biz 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
CAUTION
MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO ADIATION F OM THE MIC OWAVE GENE ATO
O OTHE PA TS CONDUCTING MIC OWAVE ENE GY.
(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
------------------------------------------------------------------------------------------------------
5-13
EXPLODED VIEW
------------------------------------------------------------------------------------------------
6-1
REPLACEMENT PARTS LIST
------------------------------------------------------------------------------------
7-1
SCHEMATIC DIAGRAM OF PC B
------------------------------------------------------------------------------
8-1
P INTED CI CUIT BOA D
-------------------------------------------------------------------------------------------------
8-2
PC B PARTS LIST
---------------------------------------------------------------------------------------------------
9-1
CONTENTS
This microwave oven is designed for household use only.
It is not recommended for commercial purposes.
DESCRIPTION
MC-7683D
230 Volts AC 50 Hz
Single phase, 3 wire grounded
Microwave 1,300W
Grill 1,250W
Combination 2,650W
Convection 1,350W (Max. 2550W)
900 Watts full microwave power (IEC60705)
2,450 MHz
2M214 - 39F
0 ~ 99 min.
530 (W) x 302 (H) x 496 (D) mm
348 (W) x 235 (H) x 366 (D) mm
19.5 kg
20.5 kg
Microwave Power for Variable Cooking
Power level
MAX (900W) ...................................... Full power throughout the cooking time
MED.-HIGH (720W)............................ approx. 80% of Full power
MEDIUM (540W) ................................ approx. 60% of Full power
DEF OST (360W).............................. approx. 40% of Full power
LOW/WA M (180W)........................... approx. 20% of Full power
• CONVECTION..................................Max 250˚C
• G ILL
• COMBINATION
Owner's manual & Cook book
Glass turntable
otating ring
Grill rack, Convection rack
Metal tray
1-1
ITEM
MODEL
Power equirement
Power Output
Microwave Frequency
Magnetron
Timer
Outside Dimensions
Cavity Dimensions
Net Weight
Shipping weight
Control Complement
Nameplate Location
Accessories
SPECIFICATIONS
Back side
• DO NOT operate on a 2-wire extension cord during
repair and use.
• NEVE TOUCH any oven components or wiring during
operation.
• BEFO E 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.
•
emove your watches whenever working close to or
replacing the Magnetron.
• NEVE operate the oven with no load.
• NEVE injure the door seal and front plate of the oven
cavity.
• NEVE put iron tools on the magnetron.
• NEVE 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
MAGNET ON
CHASSIS G OUND
FILAMENT
TE MINALS
MAGNET ON
INSTALLATIONS
3-1
INSTALLING
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 and the 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 microwave oven in an ambient temperature
less than 104°F(40°C).
6. Place the microwave oven on a sturdy and flat
surface at least 10 cm(4 inches) from the wall.
7. Place the microwave oven as far away as possible
from TV, ADIO, COMPUTE , etc., to prevent
interference.
8. Do not touch the front glass during or after cooking
of the Grill 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 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
WA NING-
THIS APPLIANCE
MUST BE EA THED
IMPO TANT
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 KNOB: Used to select the cooking mode.
2 AUTO COOK: Used to select the auto cook.
3 DISPLAY WINDOW: Used to show time of day,
cooking of power level, cooking category.
4 CLOCK: Used to set the time of day.
5 AUTO ROAST:
6 AUTO WEIGHT DEFROST: Used to select the
auto weight defrost.
7 START/Q-START: To quickly set the cooking time
directly.
8 STOP/CLEAR: Used to stop oven and clear all
entries except time of day.
9 DIAL: To select convection temperature, change
cooking time, and weight.
Turntable
otating ing
Oven Front Plate
Window Door Screen
Safety Door Lock System
Metal TrayHigh ack Low ack
Door Seal
Control Panel
1
8
9
4
5
6
2
7
3
4-2
OPERATING SEQUENCE
The following is a description of component functions
during oven operation.
1 SETTING THE CLOCK
2 MICROWAVE COOKING
3 GRILL COOKING
4 CONVECTION COOKING
To pre-heat
To cook
5 COMBINATION COOKING
To Grill Combi
To Convection Combi
6 AUTO WEIGHT DEFROST
7 AUTO COOK
8 QUICK START
9 MORE AND LESS
Clock
Desired
minute Start
Desired
hour
Stop/
Clear Function
MWO
Stop/Clear
Desired
power
level
Desired
cooking
time Start
Stop/
Clear Function
Grill Desired
cooking
time
Desired
cooking
time
Start
Stop/Clear Start
Stop/
Clear Dial
(Turn right and left)
Desired
auto cook
Stop/Clear
Stop/Clear Function
Combi-1
Desired
defrost
category Food
weight Start
Stop/Clear Desired
auto cook
category Food
weight Start
Start
Stop/
Clear
Function
Convection Desired convection
temp(40˚C, 100˚C~250˚C)
Start
Stop/
Clear
Function
Convection Desired convection
temp(40˚C, 100˚C~250˚C)
Start
Desired
cooking time
Stop/
Clear Function
Combi-1
Desired
cooking
time
Desired convection
temp(40˚C, 100˚C~250˚C)
Start
Start
SCHEMATIC DIAGRAM
4-3
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 POWE 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 are cut off 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.
• elay stops functioning.
• As the door is opened, if the contact of primary switch
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 KEY
WITH THE GRILL COOKING FUNCTION
SELECTED
• The contacts of the primary switch and the secondary
switch close the circuit.
• A.C. voltage is applied to the grill heater through grill
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 upper
plate.
4-4
L
FUSE
H.V.
T ANS-
FO ME
ELAY 2
MICOM CONT OLLE
SECONDA Y
SWITCH
P IMA Y
SWITCH
N
MONITO
SWITCH
L
FUSE
H.V.
T ANS-
FO ME
ELAY 2
MICOM CONT OLLE
SECONDA Y
SWITCH
P IMA Y
SWITCH
N
MONITO
SWITCH
ELAY 3
L
NG ILL
HEATE
L
G -Y
N
E
Tabla de contenidos
Otros manuales de Microondas de LG
LG
LG LMH2016SB Manual de usuario
LG
LG MH-6580NBC Manual de usuario
LG
LG MC-9287BP Manual de usuario
LG
LG MH-6047G Manual de usuario
LG
LG MH-607Y Manual de usuario
LG
LG MS1987US Manual de usuario
LG
LG LMHM2017SW Manual de usuario
LG
LG LMVM2055SB Manual de usuario
LG
LG LPRM1270ST Manual de uso y cuidado
LG
LG MD-0942GT Manual de usuario
LG
LG MH6329B Manual de usuario
LG
LG LMHM2237 series Manual de usuario
LG
LG MS564 Series Manual de usuario
LG
LG LMVM1935SB Manual de uso y cuidado
LG
LG MS-1145KYL Manual de usuario
LG
LG MH2046HB Manual de usuario
LG
LG MVEL2033F Manual de usuario
LG
LG MS2042DS Manual de usuario
LG
LG MW202LK Manual de usuario
LG
LG MS2587ARS Manual de usuario
