Goldstar MA2120B Bedienungsanleitung
MIC OWAVE OVEN
SERVICE MANUAL
MODEL : MA2120B
MA2120W
CAUTION
BEFO E SE VICING THE UNIT, EAD THESAFETY 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
(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
FEATU ES
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4-1
CONT OL PANEL
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4-1
OPE ATING SEQUENCE
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4-2
SCHEMATIC DIAG AM
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4-3
CI CUIT DESC IPTION
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4-4
SERVICE INFORMATION
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5-1
TOOLS AND MEASU ING INST UMENTS
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5-1
MIC OWAVE LEAKAGE TEST
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5-1
MEASU EMENT OF MIC OWAVE POWE OUTPUT
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5-3
DISASSEMBLY AND ADJUSTMENT
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5-3
INTE LOCK CONTINUITY TEST
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5-7
COMPONENT TEST P OCEDU E
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5-8
T OUBLE SHOOTING
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5-11
EXPLODED VIEW
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6-1
REPLACEMENT PARTS LIST
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7-1
SCHEMATIC DIAGRAM OF PC B
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8-1
P INTED CI CUIT BOA D
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8-2
PC 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 equirement
Power Output
Microwave Frequency
Magnetron
Timer
Outside Dimensions
Cavity Dimensions
Net Weight
Shipping weight
Control Complement
Nameplate Location
Accessories
DESCRIPTION
MA2120B/W
120 Volts AC 60 Hz
1,600 Watts (13.5 A)
Single phase, 3-wire grounded
1,200 Watts full microwave power (IEC60705)
2,450 MHz
2M282J
0 ~ 99 min. 99 sec.
237/8”(W) x 139/16”(H) x 1813/16”(D)
171/2”(W) x11”(H) x 181/2”(D)
42 lbs (approx.)
46 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 ( 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 & cooking guide
Glass turntable
otating ring
Back Side
SPECIFICATIONS
• 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.
• DO NOT touch any parts of the control panel circuit. A
resulting static electric discharge may damage this
P.C.B.
• 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.
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.
P EFE ED METHOD
ENSU E P OPE G OUND
EXISTS BEFO E USE
TEMPO A Y METHOD
(ADAPTE PLUGS NOT
PE MITTED IN CANADA)
ALIGN LA GE
P ONGS/SLOTS
ENSU E P OPE G OUND
AND FI M CONNECTION
BEFO E USE
FEATURES
CONTROL PANEL
1 INDICATORS
2 MORE / LESS: All of the one touch cook and TIMED COOK
can be adjusted to cook food for a longer or shorter time.
MORE Pressing MO E will add 10 seconds to the
cooking time.
LESS Pressing LESS will subtract 10 seconds of
cooking time.
3 ONE TOUCH CONTROL: This menu has been pre
programmed to cook food automatically by one touch.
4 Q-DEFROST: You can thaw specific foods and weight very
quickly.
5 AUTO DEFROST: This feature provides you with the best
defrosting method for frozen foods.
6 NUMBER: These used to set for time of day, cooking time,
power level, or defrost weight.
7 TIME: You can set the desired cook time.
8 CLEAR: It used to stop oven and clear all entries except
time of day.
9 START/PAUSE: This feature turns the oven on instantly.
10 DISPLAY WINDOW
11 CLOCK: It is used to set the time of day.
12 TIMER: You can use the timer function of your oven for
purpose other than cooking.
13 POWER: You can select the desired power level for
cooking.
14 EZ ON: You can extend cooking time in multiples of
1 minute by repeatedly touching this pad during cooking.
4-1
OPERATING INSTRUCTIONS
Oven Front Plate
Window Door Screen
Door Seal
Display Window
Control Panel
Safety Door Lock System
Turntable
otating ing
9
14
10
13
12
11
6
2
5
3
1
7
4
8
4-2
OPERATING SEQUENCE
The following is a description of component functions
during oven operation.
1. SETTING THE CLOCK
ex.) To set 4:30, touch number key [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 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.
3. EZ ON
4. ONE TOUCH COOKING
NOTE: Heat only 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 and hold 0 pad LOCKED appears on
the display.
TO CANCEL CHILD LOCK
• Touch and hold 0 pad LOCKED
disappears.
9. MORE / LESS
The cook time is adjustable by MO E pad or LESS
pad
CLEA CLOCK NUMBE
CLEA POPCO N
CLEA EZ on
CLEA COOKING MO E
CLEA COOKING LESS
CLEA
1ST STAGE
CLOCK CLEA AUTO
DEF OST WEIGHT STA T/PAUSE
CLEA TIME NUMBE POWE
NUMBE STA T/PAUSE
CLEA TIME NUMBE POWE
NUMBE
TIME NUMBE POWE
NUMBE STA T/PAUSE
2ND STAGE
SCHEMATIC DIAGRAM
4-3
IMPO TANT SAFETY NOTE: THE SHADED A EAS ON THIS SCHEMATIC DIAG AM INCO PO ATE SPECIAL FEATU ES
IMPO TANT FO P OTECTION F OM MIC OWAVE ADIATION, FI E, ELECT ICAL SHOCK, AND
HAZA DS. WHEN SE VICING IT IS ESSENTIAL THAT ONLY MANUFACTU E 'S SPECIFIED PA TS
BE USED FO THE C ITICAL COMPONENTS IN THE SHADED A EAS OF THE SCHEMATIC DIAG AM.
NOTICE: SINCE THIS IS BASIC SCHEMATIC DIAG AM, THE VALUES OF COMPONENTS AND
SOME PA TIAL CONNECTIONS A E SUBJECT TO CHANGE FO IMP OVEMENT.
D
P IMA Y
SWITCH
WH WH
BL WH
YL
MAGNET ON
H.V.
CAPACITO
H.V. DIODE
FUSE
AC 120V
60Hz
L
N
MICOM CONT OLLE
F.M.
T ANSFO ME
H.V.
T.T.M.
O.L.
PT1
6
5
3
1
BK
BK
BK
PK
GN
GN
BN
SECONDA Y
SWITCH
THE MOSTAT
OVEN LAMP
MONITO SWITCH
FAN MO TO
CN1
Y2
Y1
WH
BK
BK
** NOTE : DOO IS OPENED.
BK : BLACK BL : BLUE YL : YELLOW D : ED
WH : WHITE PK : PINK GN : G EEN BN : B OWN
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).
HEN SELECTING COOKING PO ER
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.
HEN 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 air (coming from the intake on the base-plate).
• The air is also directed into the oven to exhaust the
vapor in the oven through the upper plate.
• Cooking time starts counting down.
• 3.3 volts AC is generated from the filament winding of
the high voltage transformer. This 3.3 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.
HEN 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 the relay 2 is 22 seconds.
HEN 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.
• elay stops functioning.
• As the door is opened, if the contact of primary switch
and relay 2 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
L
FUSE
H.V.
T ANS-
FO ME
ELAY 2
MICOM CONT OLLE
SECONDA Y
SWITCH
P IMA Y
SWITCH
MONITO
SWITCH
N
L
FUSE
ELAY 2
MICOM CONT OLLE
SECONDA Y
SWITCH
P IMA Y
SWITCH
MONITO
SWITCH H.V.
T ANS-
FO ME
N
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