삼
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판
MODEL 721.66339
DIVISION 20
BASIC FIELD MANUAL
FOR
MICROWAVE OVEN
MODEL 721.66339800
February, 2008
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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.
MODEL 721.66339
MECHANICAL SERVICE INFORMATION
TABLE OF CONTENTS
1. Adjustment Procedures
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3
5
5
5
6
2. Precautions on Installation
3. General Precautions in Use
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4. Trial Operation
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5. Specifications
6. Overall Circuit Diagram
7. Operating Procedures
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9-10
11-12
13-17
8. Procedure for Measuring Microwave Energy Leakage
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9. Disassembly Instructions
10. Interlock Continuity Test
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18
11. Test and Checkout Procedures, and Troubleshooting
A. Test Procedures
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19-21
22-24
25-29
B. Checkout Procedures
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C. Troubleshooting
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12. Exploded view
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38-39
13. Part Reference list
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ADJUST THE LATCH AND SWITCH CLOSING
1. ADJUSTMENT PROCEDURES
To avoid possible exposure to microwave energy
leakage, adjust the door latches and interlock switches,
using the following procedure.
(3) Loosen the two screws holding the plastic latch board as
shown.
(4) With the oven door closed tightly, move the latch board
upward toward the top of the oven and/or away from the
door latch until the gaps are less than 1/64” (0.5 mm).
ONLY AUTHORIZED SERVICE PERSONNEL
SHOULD MAKE THIS ADJUSTMENT.
The Interlock Monitor and Primary Interlock Switch acts
as the final safety switch protecting the user from
microwave energy. The terminals between “COM” and
“NC” of the Interlock Monitor must close when the door
is opened. After adjusting the Interlock Monitor Switch,
make sure that it is correctly connected. See Figures 1-a
and 1-b throughout this procedure.
Hold the latch board tightly in this position until you
check the sequence of the switches in steps 5 and 6.
TEST THE LATCH AND SWITCH SEQUENCE
(5) Open the oven door slowly. Watch the door latch, the
Primary Switch. Release Rod and Lever on the switches
to make sure they are zero to the body of the switches
in the following sequence:
CHECK THE DOOR LATCH AND SWITCH
CLOSING.
- Primary Interlock Switch
- Secondary Interlock Switch
- Interlock Monitor Switch
NOTE: The outer cover of the microwave oven is
removed.
(1) Set the microwave oven on its side so that you can see
the latch board and the switches, as shown in
Figure 1-a.
Adjust the latch board until the switches operate in this
sequence. See Steps 3 and 4.
(6) Close the oven door slowly and be sure it is tightly
closed. Watch the three switches to make sure they are
zero to the body of the switches in the following
sequence:
(2) Close the door tightly and check gaps A and B to be
sure they are no more than 1/64” (0.5 mm). See Figure
1-b for close-up view of gaps A and B (door latches).
If all gaps are less than 1/64” (0.5 mm), adjustment of
the latch board may not be necessary. Go to Steps 5
and 6 to check the sequence of the switches.
- Interlock Monitor Switch
- Primary Interlock Switch
- Secondary Interlock Switch
NOTE: To correct sequence of the Primary Interlock
Switch, Secondary Interlock Switch and the
Interlock Monitor Switch is very important.
NOTE: The Interlock Monitor Switch is an added safety
check on the Primary and Secondary Interlock
Switches. If the Primary and Secondary Interlock
Switches allow the oven to operate with the door
open, the Monitor Switch will blow the fuse.
If any gap is larger than 1/64” (0.5 mm), you will need to
adjust the latch board-U, L. Go to step 3 and follow all
steps in order.
(7) When you achieve the proper sequence of switches in
Steps 5 and 6, tighten the latch board screws at that
point.
TEST THE MICROWAVE ENERGY LEAKAGE
(8) Using a survey meter, make sure the microwave energy
is below 5 mW/cm.sq.
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LATCH BOARD
DOOR LATCH
SECONDARY
INTERLOCK
SWITCH
A
MONITOR
INTERLOCK
SWITCH
PRIMARY
INTERLOCK
SWITCH
DOOR LATCH
Figure 1-a
LATCH
0-1/64"
LATCH BOARD
0-1/64"
Figure 1-b
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2. PRECAUTIONS ON INSTALLATION
(Figure 2)
4. TRIAL OPERATION
After installation, the following sequences and results
A. Plug the power supply cord into a 120 V AC, 60 Hz,
single-phase power source with a capacity of at least 20
amperes.
should be checked carefully.
A. Put a container filled with water (about 1 liter) into the
oven, and close the door tightly.
B. Since the unit weights about 36.5 lbs, be sure to place it
on a sturdy and flat surface.
C. Avoid placing the unit in a location where there is direct
heat or splashing water.
B. Touch the STOP/CLEAR and the COOK TIME keys.
C. Set cooking time for 10 minutes by touching “1”
and then “0” three times. “1000” appears in the
display window.
D. Place the unit as far away as possible from TV, radio,
etc. to prevent interference.
D. Touch the START key.
Make sure the cavity light comes on. The unit will begin
cooking and the display window will show the time
counting down by seconds.
CAUTION
E. After about 5 minutes, make sure the primary interlock
switch, the secondary interlock switch and the interlock
monitor and oven lamp switch operate properly by
opening and closing the door several times. Touch the
START key each time the door is closed.
F. Continue operating the unit. Four long beep sound
signal is heard when the time is up. The unit will shut off
automatically.
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.
Properly Polarized and
Grounded
Outlet
G. Confirm the water is hot.
H. Finally, measure the output power according to
“POWER OUTPUT MEASUREMENT” on page 12.
Three-Pronged(Grounding)
5. FEATURES AND SPECIFICATIONS
A. The safety systems incorporated in this model are:
(1) Primary interlock switch
Plug
Figure 2
3. GENERAL PRECAUTIONS IN USE
(2) Secondary interlock switch
A. Never operate the unit when it is empty. Operating the
oven with no load may shorten the life of the magnetron.
Whenever cooking dry foods (dried fish, bread, etc.) or a
small amount of food, be sure to put a glass of water
into the cooking compartment. The turntable tray may
become hot after operating, be careful when touching it.
B. Aluminum foil should be avoided because it will disrupt
cooking and may cause arcing. However, small pieces
may be used to cover some parts of food to slow the
cooking. Any aluminum foil used should never be closer
than 2.5 cm to any side wall of the oven.
(3) Interlock monitor switch
(4) Choke system
(5) Thermostat
(Note: This thermostat located on the oven cavity will
open and stop the unit from operation only if a high
temperature is reached, such as, a fire created by
overcooking food.)
B. Any one of 10 power output levels ranging 120W to
1200W can be selected by the touch control and
electronic computer system.
C. Cooking time can be displayed on the digital readout.
D. Three different cooking stages can be set. The oven
remembers three cooking stages and changes from one
cooking stage to another. This is made possible with the
memory function of the microprocessor.
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SPECIFICATIONS
Rated Power Consumption ..........................................1650W maximum
Output ..........................................................................1200W maximum (*IEC 60705 Rating standard)
...................................................................Adjustable 100W through 1200W, 11 steps
Frequency ....................................................................2,450 MHz ± 50 MHz
Power Supply...............................................................120V ±12V AC, 60Hz
Rated Current...............................................................13.8 Amp.
Magnetron Cooling.......................................................Forced Air Cooling
Microwave Stirring........................................................Turntable
Rectification..................................................................Rectification Voltage Doubler Half-Wave
Door Sealing ................................................................Choke System
Safety Devices .............................................................Thermostat:
Open at 90°C ± 5°C
Open at 75°C ± 5°C
Fuse(15A)
Primary Interlock Switch
Secondary Interlock Switch
Interlock Monitor
Magnetron....................................................................2M246
High Voltage Capacitor ................................................Capacitor: 1.05µF, 2.1KV Ac
High Voltage Diode ......................................................350mA, 9.0KV
Cavity Lamp .................................................................125V, 20W
Timer............................................................................Digital, up to 99 mm. 99 sec. (in each cooking stage)
Tray..............................................................................Tempered Safety Glass
Overall Dimensions......................................................217/18”(W) x 121/2”(H) x 171/8”(D)
Oven Cavity Size..........................................................1411/16”(W) x 95/8”(H) x 155/8”(D)
Effective Capacity of Oven Cavity................................1.2 Cu.ft.
Accessories..................................................................Use and Care Manual ,Turntable,
Rotating Ring Assembly.
SWITCH TABLE
PRIMARY
INTERLOCK
SWITCH
SECONDARY
INTERLOCK
SWITCH
INTERLOCK
MONITOR
SWITCH
SWITCH MODE
CONDITIONS
COM
NO
∞
COM
NO
∞
COM
NC
0
DOOR OPEN
0
∞
0
DOOR CLOSED
NOTE: Use the above switch table with circuit diagram on page 7.
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6. OVERALL CIRCUIT DIAGRAM
A. SCHEMATIC DIAGRAM
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B. MATRIX CIRCUIT FOR TOUCH KEY BOARD
Figure 4
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7. OPERATING PROCEDURES
A. OVEN CONTROL PANEL
1. DISPLAY. The display includes a clock and indicators that tell you
time of day, cooking time settings, and cooking functions selected.
2. QUICK TOUCH SENSOR. This pad allows you to cook most of
your favorite foods without having to select cooking times and
power levels.
3. MORE / LESS. All of the one touch cook and Timed Cook can be
adjusted to cook food for a longer or shorter time.
MORE
LESS
time.
Press MORE will add 10 seconds to the cooking time.
Press LESS will subtract 10 seconds to the cooking
4. AUTO DEFROST. This pad is an accurate defrosting method for
frozen meat, poultry and fish up to 6.0 lbs.
®
5. TrueCookPlus . Touch this pad to cook food according to
TrueCookPlus® code.
6. NUMBER PADS. Touch Number Pads to enter cooking time,
power level, quantities, or food categories.
7. COOK TIME. Touch this pad to set a cooking time.
8. STOP/CLEAR. Touch this pad to stop the oven or clear entries.
9. EXPRESS DEFROST. This pad provides you with the quick
defrosting method for 1.0 pound frozen foods.
10. MELT. Touch this pad to melt chocolate, cheese, butter, or
marshmallows.
11. SOFTEN. Touch this pad to soften ice cream, cream cheese,
butter, or frozen juice.
12. AUTO COOK. Touch this pad to select programming food items.
13. KITCHEN TIMER. Touch this pad to use your microwave oven as
a kitchen timer.
14. CLOCK. Touch this pad to enter the time of day.
15. OPTION. Touch this pad to change the oven's default settings for
sound, clock, scroll speed and weight.
16. POWER. Touch this pad to set a cooking power.
17. ADD MINUTE. Touch this pad to cook at 100% cook power for
1 minute to 99 minutes and 59 seconds.
18. START. Touch this pad to start all entries (except the Quick
Touch Sensor, Express Defrost, Auto Cook and Add Minute
function which start automatically) and to turn Child Lock on or off.
Figure 5
NOTE: A “beep” sounds when you touch a “key” on the control panel, to indicate that you have entered
a setting.
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(6) TIMED COOKING
B. EASY USE TABLE
1. Touch STOP/CLEAR.
2. Touch COOK TIME.
(1) KITCHEN TIMER
3. Touch number for cooking time.
4. Touch POWER.
5. Touch number for cooking power level.
6. Touch START.
1. Touch STOP/CLEAR.
2. Touch KITCHEN TIMER.
3. Touch correct number for time.
4. Touch START.
(7) MULTI-STAGE COOKING
1. Touch STOP/CLEAR.
(2) CHILD LOCK
To set:
2. Touch COOK TIME.
3. Touch number for cooking time.
4. Touch POWER.
1. Touch STOP/CLEAR.
2. Touch “START” more than 4 seconds.
To cancel:
5. Touch number for cooking power level.
6. Repeat steps 2-5 to set 2nd cooking stage.
7. Touch START.
1. Touch STOP/CLEAR.
2. Touch “START” more than 4 seconds.
(3) SENSOR COOK
1. Touch STOP/CLEAR.
2. Touch SENSOR COOK Category.
(4) ADD MINUTE
1. Touch STOP/CLEAR.
2. Touch ADD MINUTE.
(5) AUTO DEFROST
1. Touch STOP/CLEAR.
2. Touch AUTO DEFROST.
Three different defrosting levels are provided.
(Touch 1 : Meat
Touch 2 : Poultry
Touch 3 : Fish)
3. Enter the weight of your food in decimal
increments from 0.1 to 6.0 pounds.
4. Touch START
5. At beeping, turn food over.
6. After turning food over, touch START to resume
defrosting.
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8. PROCEDURE FOR MEASURING MICROWAVE
ENERGY LEAKAGE
B. MEASURING MICROWAVE ENERGY LEAKAGE
(1) Pour 275±15cc of 20±5°C water in a beaker which is
graduated to 600 cc, and place the beaker in the center
of the oven.
A. CAUTIONS
(1) Be sure to check a microwave emission prior to servicing
the oven if the oven is operative prior to servicing.
(2) The service personnel should inform the manufacturer,
importer, or assembler of any certified oven unit found to
have a microwave emission level in excess of
5mW/cm.sq. and 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.
(2) Set the energy leakage monitor to 2,450 MHz and use it
following the manufacturer’s recommended test
procedure to assure correct result.
(3) When measuring the leakage, always use the 2 inch
(5cm) spacer supplied with the probe.
(4) Operate the oven at its maximum output.
(5) Measure the microwave radiation using and
electromagnetic radiation monitor by holding the probe
perpendicular to the surface being measured. (See
Figure 7)
(3) If the oven operates with the door open, the service
personnel should;
- Tell the user not to operate the oven
- Contact the manufacturer and CDRH (Center for
Devices and Radiological Health) immediately.
NOTE: Address on CDRH
Move probe along shaded area.
Probe scanning speed
less than 2.5 cm/sec.
Office of Compliance (HFZ-312)
Center for Devices and Radiological Health
1390 Piccard Drive
Rockville, Maryland 20850
(4) The service personnel should check all surface and vent
openings for microwave emission testing.
(5) Check for microwave energy leakage after every
servicing. The power density of the microwave radiation
leakage emitted by the microwave oven should not
exceed 1mW/cm.sq. And always start measuring of an
unknown field to assure safety for operating personnel
from radiation leakage.
Figure 7
NOTE: The standard is 5mW/cm.sq. while in the
customer’s home. 1mW/cm.sq. stated here is
manufacturer’s own voluntary standard for units in
customer’s home.
C. MEASUREMENT WITH THE OUTER CASE REMOVED
(1) 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.
EQUIPMENT
• Electromagnetic energy leakage monitor (NARDA 8100B,
HOLADAY HI 1501)
• 600cc glass beaker
- Around the magnetron
- The waveguide
• Glass thermometer 100°C
WARNING: AVOID CONTACTING ANY HIGH VOLTAGE
PARTS.
Figure 6
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D. MEASUREMENT WITH A FULLY ASSEMBLED OVEN
(1) After all components, including the outer panels, are
fully assembled, measure for microwave energy
leakage around the door viewing window, the exhaust
opening and air inlet openings.
G. POWER OUTPUT MEASUREMENT
(1) Fill the test beaker with 59 ˚F(15 ˚C) ~ 75 ˚F(24 ˚C) 1 liter tap
water.
(2) Stir the water in the beaker with thermometer ( ˚F or ˚C) and
measure temperature as T1.
(3) Place the beaker on the center of turntable.
(4) Set for one (1) minute and three (3) seconds and operate
the oven at high power.
(2) Microwave energy leakage must not exceed the values
prescribed below.
NOTES:
NOTE: The additional three (3) seconds is to allow the
magnetron to begin generating power.
Leakage with the outer panels removed - less than
5mW/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
1 mW/cm .sq.
(5) When the heating is finished, stir the water again with
thermometer and measure the temperature of water as T2.
(6) Subtract T1 from T2, this will give you the temperature rise.
(7) The microwave power output is within specification, if the
temperature rise is as shown below:
E. NOTE WHEN MEASURING
Temperature Rise
(1) Do not exceed meter full scale deflection.
(2) The test probe must be removed no faster than 1
inch/sec (2.5cm/sec) along the shaded area, otherwise
a false reading may result.
Line Voltage
120 V
Degrees ˚F
18.9 ~ 25.2
Min. 17.5
Degrees ˚C
10.5 ~ 14
Min 9.7
108 V
(3) 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.
(4) When testing near a corner of the door, keep the probe
perpendicular to the surface making sure the probe
is moved horizontally along the oven surface.
(8) Power output will be influenced by line voltage of power
supply. Consequently, correct power output must be
measured within 120V AC ± 1 Volt while unit is operating.
SPECIAL TIP
• This oven used the button head screws.
F. RECORD KEEPING AND NOTIFICATION AFTER
MEASUREMENT
(1) 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.
(2) Should the microwave energy leakage not be more
than 1mW/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.
Button Head
(Torx style 2)
• When you remove the screws, using the
tamper-resistant Torx driver have a
pin-in-head.
(3) At least once a year, have the electromagnetic energy
leakage monitor checked for calibration by its
manufacturer.
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(6) Pull down and remove the circuit board from the control
panel.
(7) Remove the F.P.C connector from the terminal socket.
9. DISASSEMBLY INSTRUCTIONS
IMPORTANT NOTES:
UNIT MUST BE DISCONNECTED FROM ELECTRICAL
OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS,
ADJUSTMENTS AND CONTINUITY CHECKS. WAIT AT
LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE
CAPACITOR IN THE HIGH VOLTAGE POWER
SUPPLY HAS FULLY DISCHARGED. THE CAPACITOR
SHOULD BE DISCHARGED BY USING INSULATED
WIRE - I.E. TEST PROBE CONNECTED TO 10KOHM
RESISTOR IN SERIES TO GROUND. WHEN
Remove screw
ground
screw
securing
screw
RECONNECTING THE WIRE LEADS TO ANY PART,
MAKE SURE THE WIRING CONNECTIONS AND LEAD
COLORS ARE CORRECTLY MATCHED ACCORDING
TO THE OVERALL CIRCUIT DIAGRAM. (ESPECIALLY
SWITCHES AND HIGH VOLTAGE CIRCUIT.)
A. REMOVING OUTSIDE CASE (Figures 8)
(1) Remove three screws from the rear section.
(2) Remove one screw from the side section.
(3) Push the outer case back about 1 inch (3cm).
(4) Lift the case from the set.
Lift up and pull out control panel
Figure 8
B. REMOVING POWER AND CONTROL CIRCUIT
BOARD(Figure 9)
(1) Open the door.
F.P.C.Connector
Circuit Board
Control Panel
(2) Remove two screws, securing the circuit board.
(3) Disconnect the lead wire from RELAY(RY2) on the
circuit board.
(4) Lift up and pull out control panel assembly carefully
from the cavity.
(5) Disconnect the lead wire from connector(CN1) on the
circuit board.
CAUTION: DISCHARGE THE HIGH VOLTAGE
CAPACITOR BEFORE SERVICING.
Figures 9
-13-
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C. DOOR ASSEMBLY / REMOVAL
(1) Open the door.
Remove choke cover
(2) Remove the choke cover very carefully with a flat-blade
screwdriver.
CAUTION : Be careful not to damage door seal plate by
screwdriver.
(3) Lift up and push the door.
NOTE:
1. After replacing the door, be sure to check that the primary
switch, monitor switch, and secondary switch operate
normally.
2. After replacing the door, check for microwave energy leakage
with a survey meter. Microwave energy must be below the
limit of 5 mW/cm.sq. (with a 275 ml water load)
3. When mounting the door assembly to the oven assembly, be
sure to adjust the door assembly parallel to the chassis. Also
adjust so the door has no play between the inner door surface
and oven frame assembly. If the door assembly is not
mounted properly, microwaves may leak from the clearance
between the door and the oven.
Remove Door
Figure 10
-14-
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D. MAGNETRON REMOVAL
E. REMOVING THE TURNTABLE MOTOR
1) Remove the turntable and rotating ring.
2) Lay the unit down on its back.
3) Remove the turntable motor cover.
The turntable base cover is easily removed by pinching
the eight parts with a wire cutting.
(1) Disconnect the wire lead from the magnetron.
(2) Carefully remove the mounting screws holding the
magnetron and the waveguide.
(3) Remove the magnetron assembly until the tube is clear
from the waveguide.
4) Disconnect the leadwire from the turntable motor
terminals.
5) Remove the screw securing the turntable motor to the
oven cavity ASSEMBLY.
6) After repairing the motor, rotate the removed turntable
motor cover.
7) Fit the turntable motor cover’s projecting part to the base
plate slit.
NOTE:
1. When removing the magnetron, make sure its dome
does not hit any adjacent parts, or it may be damaged.
2. When replacing the magnetron, be sure to install the
magnetron gasket in the correct position and be sure
that the gasket is in good condition.
8) The taptite screw shall be used when a turntable motor
cover is secured with a screw.
3. After replacing the magnetron, check for microwave
leakage with a survey meter around the magnetron.
Microwave energy must be below the limit of 5 mW/cm2 .
(With a 275 ml. water load).
NOTE:
1. Remove the wire lead from the turntable motor VERY
CAREFULLY.
Make sure that gasket is rigidly attached to the
magnetron. To prevent microwave leakage, tighten the
mounting screws properly, making sure there is no gap
between the waveguide and the magnetron.
2. Be sure to grasp the connector, not the wires, when
removing.
Air duct
Magnetron
Waveguide
Dome
Taptite Screw
Waveguide
Bracket
Magnetron
Gasket
Wire Leads
Magnetron
Turntable Motor
Figures 11
Figures 12
-15-
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F. HIGH VOLTAGE TRANSFORMER REMOVAL
I. REMOVING SENSOR
1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from magnetron, high voltage
transformer, and capacitor.
1) Disconnect the leadwire from PCB Assembly.
2) Remove a screw securing the sensor duct.
3) Remove the screw holding the high voltage transformer to
the baseplate.
G. FAN MOTOR ASSEMBLY / REMOVAL
1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from fan motor and high voltage
capacitor.
3) Remove the two screws holding the the suction guide
ASSEMBLY to the oven cavity.
4) Remove the two screws holding the fan motor ASSEMBLY
to the suction guide ASSEMBLY.
H. HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL
1) Discharge the high voltage capacitor.
2) Disconnect the leadwire from fan motor and high voltage
capacitor.
3) Remove the screw holding the suction guide ASSEMBLY to
the oven cavity.
4) Remove the screw holding the high voltage capacitor bracket
and remove the high voltage diode earth screw.
Figures 14
Figures 13
-16-
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J. INTERLOCK SYSTEM
1) INTERLOCK MECHANISM
The door lock mechanism is a device which has been
specially designed to eliminate microwave
activity when the door is opened during cooking and thus
to prevent the danger resulting from the microwave
leakage.
2) MOUNTING OF THE PRIMARY/MONITOR/
SECONDARY SWITCHES TO THE LATCH BOARD
3) INSTALLATION AND ADJUSTMENT OF THE LATCH
BOARD TO THE OVEN ASSEMBLY
• Mount the latch board to the oven assembly.
• Adjust the latch board in the arrow direction so that oven
door will not have any play in it when the door is closed.
• Tighten the mounting screw.
• Check for play in the door by pushing the door
release button. Door movement should be less than
0.5 mm. (1/64 inch)
Don't push the door release button while making this
adjustment. Make sure that the latch moves smoothly after
adjustment is completed and that the screws are tight.
Make sure the primary, monitor, and secondary switches
operate properly by following the continuity test
procedure.
Figures 15
-17-
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10. INTERLOCK CONTINUITY TEST
WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION
EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS.
TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF OR V-5230Q FOR PRIMARY SWITCH
TYPE NO. SZM-V 16-FA-62, VP-532A-OF OR V-5220Q FOR MONITOR SWITCH
TYPE NO. SZM-V 15-FA-63, VP-533A-OFF OR SECONDARY SWITCH
A. PRIMARY INTERLOCK SWITCH TEST
B. SECONDARY INTERLOCK SWITCH TEST
When the door release button is depressed slowly with
the door closed, an audible click should be heard at
the same time or successively at intervals. When the
button is released slowly, the latches should activate
the switches with an audible click.
If the latches do not activate the switches when the
door is closed, the switches should be a adjusted in
accordance with the adjustment procedure. Disconnect
the wire lead from the primary switch. Connect the
ohmmeter leads to the common (COM) and normally
open (NO) terminal of the switch. The meter should
indicate an open circuit in the door open condition.
When the door is closed, the meter should indicate a
closed circuit.
Disconnect the wire lead from the secondary switch.
Connect the ohmmeter leads to the common (COM)
and normally open (NO) terminals of the switch. The
meter should indicate a open circuit in the door open
condition. When the door is closed, meter should
indicate an closed circuit. When the secondary switch
operation is abnormal, make the necessary adjustment
or replace the switch only with the same type of switch.
C. MONITOR SWITCH TEST
Disconnect the wire lead from the monitor switch.
Connect the ohmmeter leads to the common (COM)
and normally closed (NC) terminals of the switch. The
meter should indicate closed circuit in the door open
condition. When the door is closed, meter should
indicate an open circuit. When the monitor switch
operation is abnormal, replace with the same type of
switch.
When the primary switch operation is abnormal, make
the necessary adjustment or replace the switch only
with the same type of switch.
NOTE: After repairing the door or the interlock system,
it is necessary to do this continuity test before
operating the oven.
COMPONENTS
TEST PROCEDURE
RESULTS
SWITCHES
(Wire leads removed)
Check for continuity of the
switch with an Ohm-meter
Door
open
Door
closed
Primary
NO
COM
Switch
Monitor
Switch
NC
COM
Secondary
Switch
NO
COM
NOTE : After checking for the continuity of switches, make sure that they are
connected correctly.
-18-
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11. TEST AND CHECKOUT PROCEDURES, AND TROUBLESHOOTING
CAUTIONS
1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE
FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR
AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE
TRANSFORMER.
2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF
WATER IN CONTAINER) IN THE OVEN.
A. TEST PROCEDURES
COMPONENTS
HIGH VOLTAGE
TEST PROCEDURE
RESULTS
TRANSFORMER
(Wire leads removed)
FILAMENT
WINDING
PRIMARY
TERMINAL
1. Measure the resistance.
(Ohm-meter scale: Rx1 and Rx100)
• Primary winding
• Secondary winding
Approx.: 0.2 ~ 0.4 ohm
Approx.: 70 ~ 100 ohm
Less than: 1 ohm
• Filament winding
2. Measure the resistance.
(Ohm-meter scale: Rx1000)
• Primary winding to ground
• Filament winding to ground
Normal: Infinite
Normal: Infinite
MAGNETRON
(Wire leads removed)
1. Measure the resistance.
(Ohm-meter scale: Rx1)
• Filament terminal
Normal: Less than 1 ohm
Normal: Infinite
2. Measure the resistance.
(Ohm-meter scale: Rx1000)
• Filament to chassis
-19-
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COMPONENTS
TEST PROCEDURE
RESULTS
Antenna
Gasket
Chassis
Filament
NOTE: When testing the magnetron, be sure to install the magnetron gasket in the
correct position and be sure that the gasket is in good condition.
HIGH VOLTAGE
CAPACITOR
Measure the resistance.
(Ohm-meter scale: Rx1000)
• Terminal to terminal.
Normal: Momentarily indicates
several ohms, and
then gradually returns
to infinite.
Measure the resistance.
(Ohm-meter scale: Rx1000)
• Terminal to case.
Normal: Infinite.
HIGH VOLTAGE
DIODE
Measure the continuity (Forward).
(Ohm-meter scale: Rx10000)
Normal: Continuity.
Abnormal: Infinite.
NOTE :
Some inexpensive meters
may indicate infinite
resistance in both direction.
Measure the continuity (Reverse).
(Ohm-meter scale: Rx10000)
Normal: Infinite.
Abnormal: Continuity.
-20-
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COMPONENTS
TEST PROCEDURE
RESULTS
Check for continuity of relay 2 with an ohm-
meter.
(Remove wire leads from relay 2 and operate
the unit.)
RELAY 2
POWER
LEVEL
1
2
4 sec
6 sec
8 sec
10 sec
12 sec
14 sec
16 sec
18 sec
20 sec
22 sec
18 sec
16 sec
14 sec
12 sec
10 sec
8 sec
6 sec
4 sec
2 sec
0 sec
3
4
5
6
7
8
Relay 2
9
10
Normal:
A: Approx. 85 ~ 100 ohm.
B: Approx. 10 ~ 25 ohm.
Measure the resistance.
(Ohm-meter scale: R x 1)
FAN MOTOR
(Wire leads removed)
B
Abnormal: Infinite or several
ohm.
A
Measure the resistance.
(Ohm-meter scale: R x 1)
TURNTABLE
MOTOR
(Wire leads removed)
Normal: Approx.100~150 ohm
Abnormal: Infinite or several
ohm.
1) Disconnect sensor connector from micom
computer board.
2) Measure resistance terminal to terminal
(ohm meter scale: R X 1000)
SENSOR
Normal: Approximately
BK - RD: 5.2 Kohm
RD - WH: 2.1 Kohm
BK - WH: 2.1 Kohm
Abnormal: Infinite or several.
* Sensor cooking condition
1. Oven should be plugged in at least
5 minutes before sensor cooking.
2. Room temperature should not
exceed 95°F .
3. Be sure the exterior of the cooking
container and the interior of the oven
are dry. Wipe each off with paper
towel.
BK
1
RD
2
3
WH
4. The oven will not generate
microwave energy for the first 28
seconds of the sensor cooking cycle.
NOTE : • A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED
WHEN THE UNIT IS SERVICED FOR ANY REASON.
• MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION.
• WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE
TO GRASP THE CONNECTOR, NOT THE WIRES.
-21-
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B. CHECKOUT PROCEDURES
(1) CHECKOUT PROCEDURES FOR FUSE BLOWING
CAUTION: REPLACE BLOWN FUSE WITH 20 AMPERE FUSE.
PROBLEMS
CAUSES
Fuse blows immediately after
the door is closed.
Improper operation of the primary interlock,
secondary interlock switches and/or the interlock
monitor switch.
Fuse blows immediately after
the door is opened.
Malfunction of the high voltage transformer; the high
voltage capacitor including the diode, the magnetron,
the blower motor or the circuit board.
Fuse blows when the door is closed and START key
is touched.
NOTES:
- If the fuse is blown by an improper switch operation, replace the defective switches and the fuse at the same time.
After replacing the defective switches with new ones, make sure that they are correctly connected.
- Check for microwave energy leakage according to “1. ADJUSTMENT PROCEDURES” on page 3, when the
primary interlock, secondary interlock switches and/or the interlock monitor switches are adjusted or replaced.
-22-
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(2) CHECKOUT PROCEDURES FOR RELAY
- PROBLEM (A) -
FAN motor and oven lamp turn on without touching
START key when the door is closed.
NO
YES
Remove the mate connector of I/O
CON from the circuit board does
the unit still operate?
GOOD
NO
Replace the
circuit board
- PROBLEM (B) -
FAN motor and oven lamp turn on When the door is
closed and START key is touched.
NO
YES
Check the interlock switches
GOOD
NO
YES
Defective
Replace the
RELAY or poor
connection of
relay
micro switches.
Replace
RELAY or correct
the connection.
-23-
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(3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD
The following symptoms indicate a defective circuit
board.
(1) The start function fails to operate but the high
voltage Systems, the interlock switches, the door
sensing and the relay check good.
(4) Some segments of one or more digits do not light up, or
they continue to light up, or segments light when they
should not.
(2) The unit with a normal relay continuously operates.
(3) The buzzer does not sound or continues to sound.
(6) Wrong figures appear.
(7) The figures of all digits flicker.
(8) Some of the indicators do no light up.
(9) The clock does not keep time properly.
NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS
SERVICED FOR ANY REASON.
-24-
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C. TROUBLE SHOOTING
WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE
FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE
OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL.
CAUTIONS
1. Check grounding before checking for trouble.
2. Be careful of the high voltage circuit.
3. Discharge the high voltage capacitor.
4. When checking the continuity of the switches or of the high voltage transformer, disconnect one lead wire from these
parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage
to your meter.
5. Do not touch any part of the circuit on the PCB since static electric discharge may damage this control panel.
Always touch yourself to ground while working on this panel to discharge any static charge built up in your body.
(Micom model only)
CONDITION
CAUSE
REMEDY
Microwave oven
does not work.
Avoid using other electrical
appliances when you use the
microwave oven.
Inserting many plugs into one
outlet and using them at the
same time.
(blown fuse or breaker)
Microwave oven plug is not
inserted tightly.
Insert microwave oven plug
securely.
Use the microwave oven at
adequate line voltage.
Output power is too low.
Low AC input voltage.
This may not be a defect.
It is possible that the food
should be cooked for a
longer time period.
Food temperature is too low.
Using metallic ware and
allowing it to touch the oven
wall.
Do not use metallic ware for
cooking except where noted
in the cooking guide.
Sparks occur.
Do not use any type of
cookware with metallic
trimming.
Ceramic ware trimmed in
gold or silver powder is used.
1. Use plastic wrap or lid.
2. Stir once or twice while
cooking soup, cocoa or
milk, etc.
Inconsistent intensity of
microwave by their
characteristics.
Uneven cooking.
-25-
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(TROUBLE 1) The following visual conditions indicate a probable defective control circuit.
1. Incomplete segments.
• Segment missing.
• Partial segment missing.
• Digit flickering (NOTE: Slight flickering is normal.)
2. Colon does not turn on or blink.
3. A distinct change in the brightness of one or more numbers in display.
4. One or more digits in the display are not lighting.
5. Display indicates a number different from one touched, for example, key in 5 and 3 appears in the display.
6. Specific numbers (for example 7 or 9) will not display when key pad is touched.
7. Display does not count down with time blinking or up with clock operation.
8. Display obviously jumps in time while counting down.
9. Display counts down too fast while cooking.
10. Each indicator light does not turn on after setting cooking cycle.
11. Display time of day does not reappear when cooking is finished.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
1. No input can be
programmed.
Defective PCB
assembly.
Replace PCB
assembly.
Check the conn-
ection between
membrane key
assembly and
PCB assembly.
Continuity
Loose
connection.
Connect them
tightly.
No continuity
Everything works
as specified.
2. Some inputs
cannot be
Defective key
membrane
assembly.
Replace key
membrane
assembly.
Replace key
membrane
assembly and
check operation.
programmed.
Defective PCB
assembly.
Replace PCB
assembly.
3. Display shows a
number or figure
different from one
touched.
Still have trouble.
4. Random
programming
when touching
other pads.
5. Display is fixed
at some figure
and can not
accept any
input.
-26-
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(TROUBLE 2) Oven does not operate at all, Display window does not display any figures,
and no input is accepted.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Malfunction of the
monitor switch.
Replace fuse,
primary, monitor
switches, and
RELAY(RY2) of
P.C.B Assembly.
Check continuity
of monitor
switch (with
door closed).
1. Fuse blows.
Continuity.
No continuity.
Replace fuse
Check continuity
of primary
switch (with
Replace fuse,
primary, monitor
switches, and
Continuity.
Shorted contact at
the primary switch.
door opened).
RELAY(RY2) of
P.C.B Assembly.
No continuity.
Disconnect one
side of the wire
lead connected
from transformer
to the high
Defective high
voltage capacitor.
Replace high
voltage capacitor.
Normal.
Defective high volt-
age transformer.
Replace high volt-
age transformer.
Fuse blows again
voltage
capacitor and
operate the unit.
2. Fuse does not
blow.
No continuity.
Continuity.
Check continuity
of thermostat.
Defective
thermostat.
Replace
thermostat.
Defective power
supply cord.
Replace power
supply cord.
Check continuity
of power supply
cord.
No continuity.
-27-
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(TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired
program times are set and START pad is touched.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Defective
secondary switch.
Replace
secondary switch.
Check continuity
of secondary
switch (with
1. Setting time
does not count
down when
touching START
pad.
No continuity.
Continuity.
door closed).
Defective PCB
assembly.
Replace PCB
assembly.
Check the con-
nection between
CN1 connector
and PCB
Continuity
Connect them
tightly.
No continuity
Loose connection.
assembly.
Check fan motor.
Check oven lamp.
Abnormal
Abnormal
Defective fan motor.
Defective oven lamp.
Replace fan motor.
Replace oven lamp.
2. Fan motor or
oven lamp do
not turn on.
Normal
(TROUBLE 4) Oven seems to be operating but little heat is produced in oven load.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Lower than 90% of
rating voltage.
Decrease in power
source voltage
with load.
Suggest customer
contact local
electric power
utility co. or
qualified
Output is low
Check the
power source
voltage.
Normal
electrician.
Defective PCB
assembly.
Replace PCB
assembly.
Disconnect the
wire leads from
relay 2 and
check on and off
time with
Abnormal
Normal
multitester.
Measure the
output power.
Defective
magnetron.
Replace
magnetron.
Abnormal
NOTE : Simple test of power output-conducted by heating one liter water for one min. if available.
Minimum 8.5°C temperature rise is normal condition.
-28-
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(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run.
(Display operates properly)
CONDITION
CHECK
RESULT
CAUSE
REMEDY
No microwave
oscillation.
Defective PCB
assembly.
Replace PCB
assembly.
Disconnect the
wire leads from
relay 2 and
check continuity
of relay 2.
No continuity.
Continuity.
(Operate the unit)
Check high vol-
tage transformer
Defective high
voltage
transformer.
Replace high
voltage
transformer.
Abnormal
Normal
Check high vol-
tage capacitor.
Defective high
voltage capacitor.
Replace high
voltage capacitor.
Abnormal
Normal
Check high vol-
tage diode.
Defective high
voltage diode.
Replace high
voltage diode.
Abnormal
Normal
Check
magnetron.
Defective
magnetron.
Replace
magnetron.
Abnormal
NOTE : • Make sure the wire leads are in the correct position.
• When Removing the wire leads from the parts, be sure to grasp the connector, not the wires.
• When removing the magnetron, be sure to install the magnetron gasket in the correct position
and in good condition.
Defective PCB
assembly.
Replace PCB
assembly.
Output is full power
when you set lower
power level.
Disconnect the
Abnormal.
wire leads from
relay 2 and check
continuity relay 2.
(Operate the unit)
-29-
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#EV#
EXPLODED VIEW
INTRODUCTION
SENSOR
OUTER CASE
INTERIOR
BASE PLATE
LATCH BOARD
DOOR
CONTROL PANEL
-30-
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#EV#
DOOR PARTS
1013
1005
1004
1002
1000
1003
1001
1006
1007
-31-
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#EV#
CONTROLLER PARTS
2004
2381
2002
2006
W106
2000
-32-
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#EV#
OVEN CAVITY PARTS
W103
3001
3003
3034
W107
3002
3009
3008
W105
-33-
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#EV#
LATCH BOARD PARTS
W102
4001
4002
4000
4003
4002
4004
-34-
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#EV#
INTERIOR PARTS
W101
5014
5010
5001
5016
3006
5041
5012
W109
W208
5003
5007
W110
W109
W101
5000
3007
W101
5002
5015
5009
5006
W208
W109
9000
W101
5018
-35-
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#EV#
BASE PLATE PARTS
5008
6000
6001
6007
W101
W108
-36-
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#EV#
SENSOR PARTS
W108
W136
5011
5004
-37-
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P/NO: MFL30502909
Printed in Korea
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