LG LRM1230W User manual
MICROWAVE OVEN
SERVICE MANUAL
MODEL : LRM1230W
LRM1230B
CAUTION
EFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
website: http://www.lgservice.com
e-mail : http://www.lgeservice.com/techsup.html
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.
) 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) efore 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 CSA should be performed on each oven prior to
release to the owner.
SAFETY PRECAUTIONS
(Page)
SAFETY PRECAUTIONS
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Inside front cover
SPECIFICATIONS
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1-1
CAUTIONS
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2-1
INSTALLATIONS
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3-1
OPERATING INSTRUCTIONS
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4-1
FEATURES
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4-1
CONTROL PANEL
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4-1
OPERATING SEQUENCE
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4-2
SCHEMATIC DIAGRAM
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4-4
CIRCUIT DESCRIPTION
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4-5
SERVICE INFORMATION
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5-1
TOOLS AND MEASURING INSTRUMENTS
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5-1
MICROWAVE LEAKAGE TEST
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5-1
MEASUREMENT OF MICROWAVE POWER OUTPUT
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5-3
DISASSEM LY AND ADJUSTMENT
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5-3
INTERLOCK CONTINUITY TEST
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5-7
COMPONENT TEST PROCEDURE
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5-8
TROU LE SHOOTING
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5-11
EXPLODED VIEW
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6-1
DOOR PARTS
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6-2
CONTROLLER PARTS
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6-3
OVEN CAVITY PARTS
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6-4
LATCH OARD PARTS
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6-5
INTERIOR PARTS
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6-6
ASE PLATE PARTS
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6-7
REPLACEMENT PARTS LIST
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7-1
SCHEMATIC DIAGRAM OF P.C.B.
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8-1
PRINTED CIRCUIT OARD
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8-2
P.C.B. PARTS LIST
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9-1
CONTENTS
1-1
This microwave oven is designed for household use only.
It is not recommended for commercial purposes.
ITEM
MODEL
Power Requirement
Power Output
Microwave Frequency
Magnetron
Timer
Outside Dimensions
Cavity Dimensions
Net Weight
Shipping weight
Control Complement
Nameplate Location
Accessories
DESCRIPTION
LRM1230W/LRM1230B
120 Volts AC 60 Hz
1,650 Watts (13.8 A)
Single phase, 3 wire grounded
1,200 Watts full microwave power (IEC705)
2,450 MHz
2M246
0 ~ 99 min. 99 sec.
217/8”(W) x 121/2”(H) x 171/8”(D)
1411/16”(W) x 95/8”(H) x 155/8”(D)
36.5 lbs (approx.)
41.5 lbs (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 (Reheat) --------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 & cooking guide
Glass turntable
Rotating ring
ack Side
SPECIFICATIONS
• DO NOT operate on a 2-wire extension cord during
repair and use.
• NEVER TOUCH any oven components or wiring during
operation.
• EFORE 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.
• DO NOT touch any parts of the control panel circuit. A
resulting static electric discharge may damage this
P.C. .
• 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 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.
locking 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, RADIO, COMPUTER, etc., to prevent
interference.
GROUNDING INSTRUCTIONS
For personal safety, this appliance must be fully
grounded at all times.
In the event 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 BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.
10cm
WARNING
Improper use of the grounding plug can result in a
risk of electric shock.
Do not, under any circumstances, cut or remove
the third ground prong from the power cord plug.
PREFERRED METHOD
ENSURE PROPER GROUND
EXISTS BEFORE USE
TEMPORARY METHOD
(ADAPTER PLUGS NOT
PERMITTED IN CANADA)
ALIGN LARGE
PRONGS/SLOTS
ENSURE PROPER GROUND
AND FIRM CONNECTION
BEFORE USE
FEATURES
CONTROL PANEL
1. DISPLAY: The display includes a clock and indicators that tell
you the time of day, cook time settings, and cooking functions
selected.
2. AUTO TOUCH: Touch this pad to cook without entering a cook
time or power.
3. AUTO COOK: Touch this pad to cook without entering a cook
time or power.
4. FAST BREAKFAST: Fast breakfast has 6 food categories of
preset cook time or power.
5. CHICKEN CHOICES: Chicken choices have 4 food categories
of preset cook time or power.
6. MELT : Touch this pad to melt chocolate, cheese, butter, or
marshmallows.
7. SOFTEN : Touch this pad to soften ice cream, cream cheese,
butter, or frozen juice.
8. AUTO REHEAT: Touch this pad to reheat without entering a
cook time or power.
9. AUTO DEFROST: Touch this pad to defrost foods by entering
weight.
10. Q-DEFROST: Touch this pad to defrost foods quickly.
11. KITCHEN TIMER : Touch this pad to use your microwave
oven as a kitchen timer.
12. CUSTOM SET: Touch this pad to select sound control, time of
day, clock Off or On, scroll speed, lbs /kg choice.
13. MORE / LESS : All of the one touch cook and Timed Cook can
be adjusted to cook food for a longer or shorter time.
MORE Press MORE will add 10 seconds to the
cooking time.
LESS Press LESS will subtract 10 seconds to the
cooking time.
14. NUMBER PADS : Touch number pads to enter cook time,
power level, quantities, or weights.
15. TIME : Touch this pad to set a cook time.
16. POWER : Touch this pad to set a cook power.
17. STOP/CLEAR : It used to stop oven and clear all entries except
time day.
18. Ez-ON : You can extend cooking time in multiples of 30
seconds by repeatedly touching this pad during cooking.
19. START : This feature allows oven to begin functioning.
4-1
OPERATING INSTRUCTIONS
Oven Front Plate
Window Door Screen
Door Seal
Door Open utton
Safety Door Lock System
Turntable
Rotating Ring
Control Panel
Display Window
1
2
16
19
18
9
13
14
15
10
7
5
12
8
6
3
4
11
17
OPERATING SEQUENCE
The following is a description of component functions
during oven operation.
1. CANCEL FUNCTION
Touch the pad whenever you need to
cancel an entry or a function currently in use.
The display will return either to the last item entered
or to the clock.
2. EZ ON
3. AUTO TOUCH
NOTE: • Heat only 1 package at a time
• Then the oven will start automatically.
4. TIME COOKING
5. MULTI-STAGE COOKING
You can program your oven to switch from one power
level to another for up to 3 stages.
To set a 2-stage cook cycle.
6. AUTO DEFROST COOKING
7. CHILD LOCK
This oven has a CHILD LOCK feature
TO SET CHILD LOCK
• Touch pad.
• Touch and hold pad LOCKED
appears on the display.
TO CANCEL CHILD LOCK
• Touch and hold pad LOCKED
disappears.
8. MORE / LESS
The cook time is adjustable by MORE pad or LESS
pad
9. AUTO REHEAT
NOTE: Then the oven will start automatically.
1 . Q - DEFROST
11. KITCHEN TIMER
12. FAST BREAKFAST
NOTE: Then the oven will start automatically.
13. CHICKEN CHOICES
NOTE: Then the oven will start automatically.
4-2
STOP/CLEAR POPCORN NUM ER OF TA LE
STOP/CLEAR Ez On
STOP/CLEAR COOKING MORE
STOP/CLEAR COOKING LESS
STOP/CLEAR
1ST STAGE
STOP/CLEAR
STOP/CLEAR
STOP/CLEAR
STOP/CLEAR
AUTO
DEFROST NUM ER
NUM ER OF
WEIGHT START
STOP/CLEAR TIME NUM ER POWER STOP/CLEAR AUTO
REHEAT NUM ER OF TA LE
STOP/CLEAR Q-DEFROST
STOP/CLEAR KITCHEN
TIMER NUM ER START
STOP/CLEAR
FAST
REAKFAST
NUM ER OF TA LE
STOP/CLEAR
CHICKEN
CHOICES
NUM ER OF TA LE
NUM ER START
STOP/CLEAR TIME NUM ER POWER
NUM ER
2ND STAGE
TIME NUM ER POWER
NUM ER START
4-3
14. MELT
NOTE: Then the oven will start automatically.
15. SOFTEN
NOTE: Then the oven will start automatically.
16. AUTO COOK
NOTE: Then the oven will start automatically.
17. CUSTOM SET
NOTE: Then the oven will start automatically.
STOP/CLEAR
MELT
NUM ER OF TA LE
NUM ER OF TA LE
NUM ER OF TA LE
NUM ER OF TA LE
STOP/CLEAR
SOFTEN
STOP/CLEAR
AUTO COOK
STOP/CLEAR
CUSTOM
SET
SCHEMATIC DIAGRAM
4-4
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
E USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAGRAM.
NOTICE: SINCE THIS IS ASIC SCHEMATIC DIAGRAM, THE VALUES OF COMPONENTS AND
SOME PARTIAL CONNECTIONS ARE SU JECT TO CHANGE FOR IMPROVEMENT.
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