Goldstar Ma-1302s Service Manual
MICROWAVE OVEN
SERVICE MANUAL
MODEL: MA-1302S
CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.
http://www.LGEservice.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 CSA 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
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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4-3
CIRCUIT DESCRIPTION
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4-4
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
DISASSEMBLY AND ADJUSTMENT
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5-3
INTERLOCK CONTINUITY TEST
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5-8
COMPONENT TEST PROCEDURE
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5-9
TROUBLE SHOOTING
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5-13
EXPLODED VIEW
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6-1
REPLACEMENT PARTS LIST
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7-1
SCHEMATIC DIAGRAM OF P.C.B.
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8-1
PRINTED CIRCUIT BOARD
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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
MA-1302S
120 Volts AC 60 Hz
1,550 Watts (13.6A)
Single phase, 3 wire grounded
1,150 Watts full microwave power (IEC705)
2,450 MHz
2M246
0 ~ 99 min. 99 sec.
217/8" (W) x 125/8" (H) x 171/4"(D)
143/4" (W) x 91/4" (H) x 16" (D)
38.6 lbs (approx.)
41.9 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
Back Side
SPECIFICATIONS
¥ 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 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.B.
¥ 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.
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, 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.
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
INSURE PROPER GROUND
EXISTS BEFORE USE
10cm
TEMPORARY METHOD
(ADAPTER PLUGS ARE NOT
PERMITTED IN CANADA)
ALIGN LARGE PRONGS/SLOTS
INSURE PROPER GROUND AND
FIRM CONNECTION BEFORE USE
FEATURES
4-1
OPERATING INSTRUCTIONS
Oven Front Plate
Window Door Screen
Door Seal
Safety Door lock System
Control Panel
Display Window
Turntable
Defrost Rack
Rotating Ring
START
EZ ON
1
2
3
4
5
Sensor Cook
Defrost Hot
Potato
Fresh Vegetable
Frozen Vegetable
Frozen Entree
Ground Meat
Beverage
S
e
n
s
o
r
C
o
o
k
C
o
o
k
T
i
m
e
Power
Stop/
Clear
Timer
Popcorn
Auto Cook
Sensor
Reheat
More
Sensor
Defrost
Less
CONTROL PANEL
OPERATING SEQUENCE
The following is a description of component functions
during oven operation.
1. SETTING THE CLOCK
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 either return to the last item entered
or to the clock.
3. EZ ON
4. SENSOR TOUCH
5. TIME COOKING
6. SENSOR COOK
7. AUTO COOKING
8. CHILD LOCK
This oven has a CHILD LOCK feature
TO SET CHILD LOCK
¥ Touch the pad
¥ Touch and hold STOP/CLEAR pad LOCKED
appear on the display.
TO CANCEL CHILD LOCK
¥ Touch the pad
¥ Touch and hold STOP/CLEAR pad LOCKED
disappears.
9. MORE / LESS
The cook time is adjustable by MORE pad or LESS
pad
10. TIMER
11. SENSOR POPCORN
12. SENSOR BEVERAGE / REHEAT
/ DEFROST
4-2
STOP/CLEAR TIMER
For 3 seconds Time setting
once
STOP/CLEAR REHEAT
STOP/CLEAR DEFROST
STOP/CLEAR EZ on
STOP/CLEAR
COOKING
STOP/CLEAR
POPCORN
STOP/CLEAR
BEVERAGE
STOP/CLEAR
SENSOR REHEAT
STOP/CLEAR
SENSOR DEFROST
MORE
STOP/CLEAR COOKING
LESS
STOP/CLEAR
STOP/CLEAR POWER
START
STOP/CLEAR START
STOP/CLEAR
STOP/CLEAR
STOP/CLEAR TIMER START
STOP/CLEAR
AUTO
COOK
START
START
Push
START
EZ ON
Minute setting
START
EZ ON
START
START
EZ ON
START
EZ ON
START
EZ ON
EZ ON
START
START
EZ ON
START
EZ ON
START
EZ ON
SCHEMATIC DIAGRAM
4-3
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
BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAGRAM.
NOTICE: SINCE THIS IS BASIC SCHEMATIC DIAGRAM, THE VALUES OF COMPONENTS AND
SOME PARTIAL CONNECTIONS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
L
N
FUSE 20A
CN3
RY2
CN2
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.
¥ 3.3 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.
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 POWER 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 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.
¥ Relay stops functioning.
¥ As the door is opened, if the contact of primary switch
and relay2 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
FUSE
H.V.
TRANS-
FORMER
RELAY 2
MICOM CONTROLLER
SECONDARY
SWITCH
MONITOR
SWITCH
N
PRIMARY
SWITCH
L
FUSE
N
L
PRIMARY
SWITCH
MONITOR
SWITCH
RELAY 2
MICOM CONTROLLER
H.V.
TRANS-
FORMER
SECONDARY
SWITCH
CAUTIONS
¥ Be sure to check microwave leakage prior to
servicing the oven if the oven is operative prior to
servicing.
¥ The service personnel should inform the
manufacture importer, or assembler of any
certified oven unit found to have a microwave
emission level in excess of 5 mW/cm2and should
repair any unit found to have excessive emission levels
at no cost to the owner and should ascertain the cause
of the excessive leakage. The service personnel
should instruct the owner not to use the unit until the
oven has been brought into compliance.
¥ If the oven operates with the door open, the service
personnel should:
- Tell the user not to operate the oven.
- Contact the manufacturer.
¥ The service personnel should check all surface and
vent openings for microwave leakage.
¥ Check for microwave leakage after every servicing.
The power density of the microwave radiation leakage
emitted by the microwave oven should not exceed
4 mW/cm2. Always start measuring of an unknown field
to assure safety for operating personnel from radiation
leakage.
MEASURING MICROWAVE ENERGY
LEAKAGE
¥ Pour 275±15cc of 20±5¡C(68±9¡F) 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
Move probe along shaded area
Probe scanning speed
Less than 2.5 cm/sec
( 1in/sec)
5-1
SERVICE INFORMATION
TOOLS AND MEASURING INSTRUMENTS
MICROWAVE LEAKAGE TEST
NECESSARY TOOLS
Tools normally used for TV servicing are sufficient.
Standard tools are listed below.
¥ Diagonal pliers
¥ Long nose pliers
¥ Phillips screwdriver
¥ Flat blade screwdriver
¥ Wrench (size 5mm)
¥ Nutdriver (size 5mm)
¥ Adjustable wrench
¥ Soldering iron
¥ Solder
¥ Vinyl insulation tape
¥ Polishing cloth
NECESSARY MEASURING INSTRUMENTS
¥ TESTER (VOLTS-DC, AC, Ohmmeter)
¥ Microwave survey meter
- Holaday HI-1500
HI-1501
- Narda 8100
8200
¥ Inch scale
¥ 600 cc non conductive material beaker (glass or plastic),
inside diameter: approx. 8.5 cm (3
1
/2 in.)
¥ Cylindrical and made of borosilicate glass vessel.
max. thickness: 3 mm
outside diameter: approx. 190mm
height: approx. 90mm
¥ Glass thermometer: 100¡C or 212¡F (1 deg scale)
MEASUREMENT WITH OUTER CASE
REMOVED
¥ When you replace the magnetron, measure for
microwave energy leakage before the outer case is
installed and after all necessary components are
replaced or adjusted.
Special care should be taken in measuring the
following parts. (Circled area of Fig. below)
- 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.
NOTE: Leakage with the outer case removed less than
5 mW/cm.sq. Leakage for a fully assembled
oven (Before the latch switch (primary) is
interrupted) with the door in a slightly opened
position-less than 2 mW/cm.sq.
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.
¥ The microwave energy leakage should not be more
than 4 mW/cm.sq. after 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
manufacturer.
5-2
WARNING : AVOID CONTACTING ANY
HIGH VOLTAGE PARTS
SPECIAL TIP
¥ This oven used the button head screws.
¥ When you remove the screws, using the
tamper-resistant Torx driver have a
pin-in-head.
Button Head
(Torx style 2)
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