LG LMV1925SW User manual
MICROWA E O EN
SERVICE MANUAL
MODEL: LMV1925SW
BEFORE $SER ICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.
LMV1925SB
LMV1925SBQ
CAUTION
Website: ttp://us.lgservice.com
CAUTION
SAFETY PRECAUTIONS
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPOSURE
TO EXCESSIVE MICROWAVE ENERGY
a. Do not operate or allow t e oven to be operated wit t e door open.
b. Make t e following safety c ecks on all ovens to be serviced before activating t e
magnetron or ot er microwave source, and make repairs as necessary; (1) Interlock
operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and
ot er damage), (4) damage to or loosening of inges and latc es, (5) evidence of
dropping or abuse.
c. Before turning on microwave power for any service test or inspection wit in t e
microwave generating compartments, c eck t e magnetron, wave guide or
transmission line, and cavity for proper alignment, integrity, and connections.
d. Any defective or misadjusted components in t e interlock, monitor, door seal, and
microwave generation and transmission systems s all be repaired, replaced, or
adjusted by procedures described in t is manual before t e oven is released to t e
owner.
e. A Microwave leakage c eck to verify compliance wit t e CSA Standard s ould be
performed on eac oven prior to release to t e owner.
• Proper operation of the microwave ovens requires that the magnetron be assembled to the
wave guide 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.
• Routine service safety procedures should be exercised at all times.
• Untrained personnel should not attempt service without a thorough review of the test
procedures and safety information contained in this manual.
FOREWORD
Read this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing
yourself to the Microwave Energy normally contained within the oven cavity.
TABLE OF CONTENTS
(Page)
SAFETY PRECAUTIONS ......................................................................................................... Inside front page
SPECIFICATIONS.......................................................................................................................................... 1-1
CAUTIONS ..................................................................................................................................................... 2-1
INSTALLATION .............................................................................................................................................. 3-1
OPERATING INSTRUCTIONS....................................................................................................................... 4-1
CONTROL PANEL ................................................................................................................................. 4-1
CONTROL PANEL INSTRUCTIONS ..................................................................................................... 4-2
O ERALL CIRCUIT DIAGRAM...................................................................................................................... 5-1
SCHEMATIC DIAGRAM......................................................................................................................... 5-1
MATRIX CIRCUIT FOR TOUCH KEY BOARD ...................................................................................... 5-2
GENERAL INFORMATION FOR SER ICE ................................................................................................... 6-1
GENERAL PRECAUTIONS IN USE ...................................................................................................... 6-1
TRIAL OPERATION ............................................................................................................................... 6-1
FEATURES AND SPECIFICATIONS FEATURES................................................................................. 6-1
SER ICE INFORMATION ............................................................................................................................. 7-1
PRECAUTIONS AND REPAIR SER ICE TIPS..................................................................................... 7-1
MICROWA E LEAKAGE TEST ............................................................................................................. 7-2
POWER OUTPUT MEASUREMENT ..................................................................................................... 7-3
DISASSEMBLY INSTRUCTIONS .......................................................................................................... 7-4
INTERLOCK SYSTEM .......................................................................................................................... 7-12
INTERLOCK CONTINUITY TEST.......................................................................................................... 7-14
TEST AND CHECKOUT PROCEDURES AND TROUBLE SHOOTING................................................ 7-15
A. TEST PROCEDURES................................................................................................................ 7-15
B. CHECKOUT PROCEDURES..................................................................................................... 7-18
C. TROUBLE SHOOTING.............................................................................................................. 7-21
EXPLODED IEW .......................................................................................................................................... 8-1
REPLACEMENT PARTS LIST ............................................................................................................... 8-8
SCHEMATIC DIAGRAM OF PCB .......................................................................................................... 8-14
PRINTED CIRCUIT BOARD .................................................................................................................. 8-15
PCB PARTS LIST................................................................................................................................... 8-16
1-1
Rated Power Consumption..................................................1,500W maximum (Microwave oven+Cook top lamps+ entilation fan)
Microwave Output.................................................................1000W (IEC 60705)
Adjustable 100W through 1000W, 10 steps
Frequency .............................................................................2,450 MHz ±50 MHz
Power Supply........................................................................120 AC, 60 Hz
Rated Current .......................................................................13 Amp. (Microwave oven+Cook top lamps+ entilation fan)
Magnetron Cooling ...............................................................Forced Air Cooling
Rectification...........................................................................Rectification oltage Double Half-Wave
Door Sealing .........................................................................Choke System
Safety Devices......................................................................Magnetron Thermal Fuse:
Open at 109°C ±4°C
Oven Cavity Thermostat:
Open at 110°C ±5°C
Fuse(20A)
Primary Interlock Switch
Secondary Interlock Switch
Interlock Monitor
Magnetron.............................................................................2M248
High oltage Capacitor ........................................................Capacitor: 1.0µF, 2.1 K AC
High oltage Diode...............................................................Diode; 350mA, 9.0 K
Cook top Lamp .....................................................................125 , 30 W
Cavity Lamp..........................................................................125 , 30 W
Timer .....................................................................................Digital, up to 99 mim. 99 sec. (in each cooking stage)
Tray .......................................................................................Tempered Safety Glass
Overall Dimensions ..............................................................2915/16”(W)x167/16”(D)x155/8”(H)
Oven Cavity Size .................................................................223/8”(W)x10”(D)x1419/32”(H)
Effective Capacity of Oven Cavity .......................................1.9 Cu.ft.
Accessories...........................................................................Owner’s Manual & Cooking Guide, Installation Manual,
Exhaust Adapter, Exhaust Damper, Mounting Kit and Two Filters,
Rotating Ring Assembly, Metal Rack, Defrosting Rack.
SPECIFICATIONS
2-1
CAUTIONS
• DO NOT operate on a 2-wire extension cord during
repair and use.
• NE ER 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 watch 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.B.
• NE ER operate the oven with no load.
• NE ER injure the door seal and front plate of the oven
cavity.
• NE ER put iron tools on the magnetron.
• NE ER 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 t at t e magnetron gasket is properly
installed around t e dome of t e tube w enever
installing t e magnetron.
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
3-1
INSTALLATION
PRECAUTIONS ON INSTALLATION
A. Plug the power supply cord into a 120 AC, 60Hz,
single-phase power source with a capacity of 15A
or 20A.
B. Avoid placing the unit in a location where there is
direct heat or splashing water.
C. Install the unit on the mounting plate firmly.
D. Place the unit as far away as possible from T ,
radio, 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.
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.
CAUTION
This unit is equipped with a 3-prong plug for your
safety. If the wall outlet is a grounded 3-hole type,
the unit will be grounded automatically.
Plug wit Ground
Prong
Properly Polarized
and Grounded
Outlet
CONTROL PANEL
4-1
OPERATING INSTRUCTIONS
25
21
24
28
26
23
4
7
9
12
10
20
22
27
2
5
3
6
11
8
13
18
17
14
15
16
19
1
CONTROL PANEL INSTRUCTIONS
4-2
1. DISPLAY: The Display includes a clock and indicators to
tell you time of day, cooking time settings and cooking
functions selected.
2. POPCORN: Touch this pad when popping popcorn in
your microwave oven. The oven’s sensor will tell the oven
how long to cook depending on the amount of humidity it
detects from the popcorn.
3. POTATO: Touch this pad to cook potatoes. The oven’s
sensor will tell the oven how long to cook depending on
the amount of humidity it detects from the potato.
4. PIZZA: Touch this pad to cook pizza without selecting
cooking times and power levels.
5. COOK: Touch this pad to cook frozen entree, casserole,
and rice. The oven’s sensor will tell the oven how long to
cook depending on the amount of humidity coming from
the food.
6. REHEAT: Touch this pad to reheat casserole, dinner
plate, and soup/sauce. The oven’s sensor will tell the oven
how long to cook depending on the amount of humidity
coming from the food.
7. VEGETABLE: Touch this pad to reheat vegetables. The
oven’s sensor will tell the oven how long to cook
depending on the amount of humidity it detects from the
vegetables.
8. CUSTOM COOK: Touch this pad to recall one cooking
instruction previously programmed into memory.
9. EZ-ON: Touch this pad to set and start quickly at 100%
power level.
10. AUTO DEFROST: Meat, poultry, fish. Touch this pad to
select food type and defrost food by weight.
11. TIME DEFROST: Touch this pad to defrost most other
frozen foods.
12. Q DEFROST: This pad provides you with the RAPID
defrosting method for 1.0 pounds frozen foods.
13. NUMBER: Touch number pads to enter cooking time,
power level, quantities, or weights.
14. KITCHEN TIMER: Touch this pad to set the kitchen
timer.
15. CLOCK: Touch this pad to enter the time of day.
16. LIGHT TIMER: Touch this pad to set the light timer.
17. MORE: Touch this pad to add ten seconds of cooking
time each time you press it.
18. LESS: Touch this pad to subtract ten seconds of cooking
time each time you press it.
19. HELP: Touch this pad to learn how to use each oven
function.
20. STOP/CLEAR: Touch this pad to stop the oven or to
clear all entries.
21. START: Touch this pad to start a function. If you open
the door after oven begins to cook, START again.
22. POWER LEVEL: Touch this pad to select a cooking
power level.
23. CUSTOM SET: Touch this pad to change the oven’s
default settings for sound, clock, display speed and
defrost weight.
24. HOLD WARM: Touch this pad to keep hot, cooked foods
warm in your microwave oven for up to 99 minutes 99
seconds.
25. PROGRAM: Touch this pad to set a cooking time.
26. LIGHT HI-LOW-OFF: Touch this pad to turn on the
cooktop/countertop light.
27. VENT HI-LOW-OFF: Touch this pad to turn the fan on or
off.
28. TURNTABLE ON-OFF: Touch this pad to turn off the
turntable. OFF will appear in the display.
WARNING:
DO NOT RUN THE OVEN EMPTY WITHOUT FOOD IN IT.
5-1
SCHEMATIC DIAGRAM
OVERALL CIRCUIT DIAGRAM
5-2
MATRIX CIRCUIT FOR TOUCH KEY BOARD
CUSTOM
SET
CUSTOM
COOK
Q
DEFROST
Ez On
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