BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.
Page 2
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 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.
• 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.
Page 3
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.
13.5 Amp. (Microwave oven+Cook top lamps+Ventilation fan)
Forced Air Cooling
Rectification Voltage Double Half-Wave
Choke System
Magnetron Thermal Fuse:
Open at 150°C ± 6°C
Oven Cavity Thermostat:
Open at 145°C ± 6°C
Fuse(20A)
Primary Interlock Switch
Secondary Interlock Switch
Interlock Monitor
2M246-21CT
Capacitor: 1.0µF, 2.1 KV AC
Diode; 350mA, 9.0 KV
125 V, 20 W
125 V, 20 W
Digital, up to 99 mim. 99 sec. (in each cooking stage)
Tempered Safety Glass
2915/16"(W)x167/16"(D)x153/8"(H)
1.7 Cu.ft.
Owner’s Manual & Cooking Guide, Installation Manual,
Exhaust Adapter, Exhaust Damper, Mounting Kit and Two
Filters, Rotating Ring Assembly, Metal Rack, Drip Pan.
1-1
Page 5
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.
• 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.
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.
• 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.
• 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.
ANTENNA
Gasket
COOLING FIN
FILAMENT
TERMINALS
MAGNETRON
CHASSIS GROUND
MAGNETRON
THE OVEN IS TO BE SERVICED ONLY
BY PROPERLY QUALIFIED SERVICE
PERSONNEL.
2-1
Page 6
INSTALLATIONS
BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.
PRECAUTIONS ON INSTALLATION
A. Plug the power supply cord into a 120V 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 TV,
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.
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 with Ground
Prong
Properly Polarized
and Grounded
Outlet
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.
3-1
Page 7
CONTROL PANEL
OPERATING INSTRUCTIONS
For Model: AMV6177AAB
AMV6177AAQ
AMV6177AAS
AMV6177AAW
4-1
Page 8
CONTROL PANEL INSTRUCTIONS
1. DISPLAY: The Display includes a clock and
indicators to tell you time of day, cooking time
settings and cooking functions selected.
2. MICRO: Touch this pad when setting Microwave
cooking.
3. CONV: Touch this pad when setting Convection
cooking.
4. BROIL: Touch this pad when setting broil cooking.
5. COMBI: Touch this pad when setting combination
cooking or preheat.
6. SENSOR 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.
7. SENSOR COOK: Touch this pad to cook baked
potato, frozen vegetable, fresh vegetable, canned
vegetable, frozen entrée and rice. The oven’s
sensor will tell the oven how long to cook depending
on the amount of humidity coming from the food.
8. SENSOR REHEAT: Touch this pad to reheat
casserole, dinner plate, pizza slice 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.
9. CUSTOM PROGRAM: Touch this pad to recall one
cooking instruction previously programmed into
memory.
10. AUTO COOK: Touch this pad to cook Bacon,
Fresh Roll & Muffin, Frozen Roll & Muffin,
Beverage, Chicken Pieces, Hot Cereal.
11. AUTO DEFROST: Touch this pad to select food
type and defrost food by weight.
12. AUTO COMBI: Touch this pad when setting weight
combination cooking.
13. AUTO BROIL: Touch this pad when setting weight
broil cooking.
14. SOFTEN: Touch this pad to soften Butter, Ice
Cream, Cream Cheese or Frozen Juice.
15. MELT: Touch this pad to melt Butter, Chocolate,
Cheese, Marshmallow.
16. Add 30 SEC.: Touch this pad to set and start
quickly at 100% power level.
17. NUMBER: Touch number pads to enter cooking
time, power level, quantities, weights, or cooking
temperature.
18. KITCHEN TIMER: Touch this pad to set the
kitchen timer.
19. CLOCK: Touch this pad to enter the time of day.
20. CONTROL SETUP: Touch this pad to change the
oven’s default settings for sound, clock, display
speed and defrost weight.
21. MORE: Touch this pad to add ten seconds of
cooking time each time you press it.
22. LESS: Touch this pad to subtract ten seconds of
cooking time each time you press it.
23. POWER: Touch this pad to select a cooking power
level.
24. STOP/CLEAR: Touch this pad to stop the oven or
to clear all entries.
25. ENTER/START: Touch this pad to start a function
or enter all entries. If you open the door after oven
begins to cook, touch ENTER/START again.
26. TURNTABLE ON/OFF: Touch this pad to turn off
the turntable. OFF will appear in the display.
27. LIGHT HI/LO/OFF: Touch this pad to turn on the
cooktop/countertop light.
28. LIGHT TIMER: Touch this pad to set the light
timer.
29. VENT ON/OFF: Touch this pad to turn the fan
on/off.
30. VENT 5-SPEED: Touch this pad to choose one of
5 fan speeds.
31. AUTO TIME SET: Touch this pad when setting
ventilation time.(1, 3, 5, 10, 30 minutes.)
4-2
Page 9
OVERALL CIRCUIT DIAGRAM
SCHEMATIC DIAGRAM (I) *Check the Model No.
For Model: AMV6177AAB
AMV6177AAQ
AMV6177AAS
AMV6177AAW
5-1
Page 10
SCHEMATIC DIAGRAM (II) *Check the Model No. (ADD Noise filter)
DISPLAY ERROR MODE
F1THERMISTOR OPEN
F2THERMISTOR SHORT FOR COOKING
F3THERMISTOR SHORT AFTER COOKING
F4SENSOR OPEN
F5DAMPER SWITCH SENSING ERROR
For Model: AMV6177AAB
AMV6177AAQ
AMV6177AAS
AMV6177AAW
5-2
Page 11
MATRIX CIRCUIT FOR TOUCH KEY BOARD
For Model: AMV6177AAB
AMV617AAQ
AMV6177AAS
AMV6177AAW
5-3
Page 12
GENERAL INFORMATION FOR SERVICE
GENERAL PRECAUTIONS IN USE
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 glass turntable 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.
TRIAL OPERATION
After installation, the following sequences and results
should be checked carefully.
A. Put a container filled with water (about 1 liter) into
the oven, and close the door tightly.
B. Set cooking time for 10 minutes by touching “1”
and then “0” three times. “1, 0, 0, 0” appears in
the display window.
C. 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.
D. After about 5 minutes, make sure the primary
interlock switch, the secondary interlock switch and
the interlock monitor switch operate properly by
opening and closing the door several times. Touch
the START key each time the door is closed.
E. Continue operating the unit. Four long beep sound
signal is heard when the time is up. The unit will
shut off automatically.
F. Confirm the water is hot.
G. Finally, measure the output power according to
“POWER OUTPUT MEASUREMENT” on
page 7-3.
FEATURES AND SPECIFICATIONS
FEATURES
A. The safety systems incorporated in this model are:
(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 95W to
950W can be selected by the touch control and
electronic computer system.
6-1
Page 13
SERVICE INFORMATION
PRECAUTIONS AND REPAIR SERVICE TIPS
PRELIMINARY
A. SINCE NEARLY 2,100 VOLTS EXISTS IN SOME
CIRCUITS OF THIS UNIT REPAIRS SHOULD BE
CARRIED OUT WITH GREAT CARE.
The filament leads of magnetron carry High
Voltage with respect to ground. Extreme caution
must be exercised. Never plug the unit into a
power source to determine which component is
defective in high voltage section.
B. TO AVOID POSSIBLE EXPOSURE TO
MICROWAVE ENERGY LEAKAGE, THE
FOLLOWING PRECAUTIONS MUST BE TAKEN
BEFORE SERVICING.
(1) Before the power is applied:
(a) Make sure the primary interlock switch, the
secondary interlock switch and the interlock
monitor switch operate properly by opening
and closing the door several by opening and
closing the door several times.
(b) Make sure the perforated screen and the
dielectric choke of the door are correctly and
firmly mounted.
(2) After power is applied:
(a) Make sure the interlock switch mechanism
is operating properly by opening and closing
the door.
(b) Check microwave energy leakage must
be below
the limit of 5 mW/cm2.
(All service adjustments should be made for
minimum microwave energy leakage
readings).
(3) Do not operate the unit until it is completely
repaired, if any of the following conditions exist.
The unit must not be operated.
(a) The door does not close firmly.
(b) The hinge is broken.
(c) The door seal is damaged.
(d) The door is bent or warped, or there is any
other visible damage on the unit that may
cause microwave energy leakage.
NOTE: Always keep the seal clean.
(e) Make sure that there are no defective parts
in the interlock mechanism.
(f) Make sure that there are no detective parts
in the microwave generating and transmission
assembly (especially waveguide).
(4) The following items should be checked after the
unit is repaired:
(a) The interlock monitor switch is connected
correctly and firmly.
(b) The magnetron gasket is properly positioned
and mounted.
(c) The waveguide and the oven cavity are intact.
(no microwave energy leakage)
(d) The door can be properly closed and the
safety switches work properly.
(e) The unit must stop when the door is opened or
the time is up.
The unit must not be operated with any of the above
components removed or by-passed.
7-1
Page 14
MICROWAVE LEAKAGE TEST
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.
• 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. ( 1 in/sec)
EQUIPMENT
•
TESTER (VOLTS-DC, AC, Ohmmeter)
• Microwave survey meter
- Holaday HI-1500
HI-1501
- Narda8100
8200
• 600 cc non conductive material beaker (glass or
plastic), inside diameter: approx. 8.5 cm (31/2in.)
• Glass thermometer: 100°C or 212°F (1 deg scale)
7-2
Page 15
MEASUREMENT WITH THE OUTER CASE
WATER LOAD
TURNTABLE
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.
- Around the magnetron
- The waveguide
WARNING: AVOID CONTACTING ANY HIGH
VOLTAGE PARTS.
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.
(2) Microwave energy leakage must not exceed the
values prescribed below.
NOTES:
Leakage with the outer panels removed - less
than 5 mW/cm2.
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/cm2.
NOTE WHEN MEASURING
(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.
(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 horizontally along the oven
surface, this may possibly cause probe damage.
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 2 mW/cm2after determining that all
parts are in good condition, functioning properly
and genuine replacement parts which are listed in
this manual have been used.
(3) At least once a year, have the electromagnetic
energy leakage monitor checked for calibration
by its manufacturer.
POWER OUTPUT MEASUREMENT
(1) Microwave power output measurement is made with
the microwave oven supplied at its rated voltage and
operated at its maximum microwave power setting
with a load of (1000±5) g of potable water.
(2) The water is contained in a cylindrical borosilicate
glass vessel having a maximum material thickness
of 1/8" (3 mm) and an outside diameter of
approximately 7.6" (190mm).
(3) The oven and the empty vessel are at ambient
temperature prior to the start of the test.
(4) The initial temperature (T1) of the water is (10±2)°C
(50°F) It is measured immediately before the water is
added to the vessel. After addition of the water to the
vessel, the load is immediately placed on the center
of the turntable which is in the lowest position and the
microwave power switched on.
(5) The time T for the temperature of the water to rise by
a value ∆T of (10±2)°K is measured, where T is the
time in seconds and ∆T is the temperature rise. The
initial and final water temperatures are selected so
that the maximum difference between the final water
temperature and the ambient temperature is 5°K.
(6) The microwave power output P in watts is
calculated from the following formula :
4,187 X (∆T) + 0.55 X (T2- T0) X M
P =
T
• T2: Temperature after heating
0
: Temperature after bown
• T
• M : Weight of bowl
is measured while the microwave generator is
operating at full power. Magnetron filament heat-up
time is not included. (about 3 sec)
(7) The water is stirred to equalize temperature
throughout the vessel, prior to measuring the final
water temperature.
(8) Stirring devices and measuring instruments are
selected in order to minimize addition or removal of
heat.
7-3
Page 16
DISASSEMBLY INSTRUCTIONS
Figure 1
Control Panel
Screw
Power
Transformer
(Relay 8)
(CN1)
(Relay 10)
(Relay 11)
(CN4)
(CN5)
(CN2)
Circuit Board
Figure 2
FPC Connector(S1)
Control Bracket
Circuit Board
Figure 3
IMPORTANT NOTES:
UNIT MUST BE DISCONNECTED FROM ELECTRICAL OUTLET WHEN MAKING REPAIRS, REPLACEMENTS, 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 10K-OHM RESISTOR IN SERIES
TO GROUND.
WHEN 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 POWER AND CONTROL
CIRCUIT BOARD (Figures 1, 2 and 3)
(1) Remove a screw securing the control panel
assembly to the oven cavity.
(2) Remove the control panel with pushing it upward.
(3) Remove the three connectors (CN1, CN2, CN4,
CN5) and wire leads (Relay8, Relay10, Relay11)
from the circuit board.
(4) Remove 3 screws securing the circuit board.
(5) Remove the FPC connector from the terminal
socket following “HOW TO REMOVE THE FPC
CONNECTOR” on the next page.
(6) Remove the circuit board from the control bracket
carefully.
7-4
Page 17
HOW TO REMOVE THE F.P.C. CONNECTOR
HOW TO INSERT THE F.P.C. CONNECTOR
Follow the steps below as illustrated in Figures 4
and 5 to remove the F.P.C. connector.
(1) Hold the edges of the plastic fastener with
thumb and forefinger.
(Figure 4)
(2) Lift up the lever of the plastic fastener from
the terminal socket by lightly pressing the
lever end with forefinger.
(Figure 5)
(3) Remove the F.P.C. connector from the
terminal socket.
Follow the steps below as illustrated in Figures 6
and 7 to insert the F.P.C. connector.
(1) Insert the F.P.C. connector into the terminal
socket securely with the fingers.
(2) Hold the plastic fastener with thumb and
forefinger of the other hand, and push it
slowly into the terminal socket. (Figure 6)
NOTE: When reconnecting the F.P.C
connector make sure that the holes
on the F.P.C. connector are properly
engaged with the hooks on the plastic
fastener
(3) Lock the level of the plastic fastener into the
hook of the terminal socket securely by
releasing the fingers.
(Figure 7)
Figure 4
Figure 5
Figure 6
Figure 7
7-5
Page 18
B. REMOVING THE OUT CASE(Figure 8)
Vent Grille
Controller
(3 screws)
Door
Mounting
Plate
(1 or 2 screws)
Out Case
Mount,All
Figure 8
(1) Remove the vent grille by removing two screws
securing it to the out case.
(2) Remove two screws securing it to the air duct.
(3) Remove the mounting plate by turning the screws
(1 or 2 screws) securing it to the out case.
(4) Remove two screws on the left central edge and
one screws on the right central edge of Base
plate. Remove the Mount, All from the out case by
removing one screw securing it to the out case.
(5) Remove the outcase with disconnecting power
cord connector.
7-6
Page 19
C. REMOVING THE DOOR INTERLOCK
Latch Board
Primary
Interlock Switch
Interlock
Monitor Switch
Secondary
Interlock Switch
Latch Board
BK(CN1)
RD(Oven TCO)
RD(H.V.Transformer)
WH(from Convection Heater)
Primary Interlock Switch
Monitor Interlock Switch
Secondary Interlock Switch
PK(from P.C.B)
GN
(
from P.C.B)
WH
(from H.V.Transformer)
RD/BK
(from H.V.Transformer/
fmn H.V.Transformer/Grill Heater)
Figure 9
Figure 10
WIRE COLOR
SYMBOL COLOR
WH
BK
BR
RD
BL
PK
GY
GN
N.P.
WHITE
BLACK
BROWN
RED
BLUE
PINK
GREY
GREEN
Not Provided
SWITCHES (Figures 9, 10)
(1) Disconnect the wire leads from the interlock
switches.
(2) Remove two screws securing the Latch Board.
(3) Make necessary replacements and check
microwave energy leakage according to
“ADJUSTMENT PROCEDURE” on page 7-12.
7-7
Page 20
D. REMOVING MAGNETRON
Figure 11
Figure 13-aFigure 13-b
Figure 12
Vent Grille
Controller
(3 screws)
Door
Mounting
Plate
(1 or 2 screws)
Out Case
Mount,All
(Figures 11 Through 13b)
(1) Remove the vent grille by loosening two screws.
(Figure 11)
(2) Remove the outcase. See page 7-6.
(3) Remove three tap tite screws securing the
magnetron to the wave guide.
(4) Remove the magnetron VERY CAREFULLY.
NOTES:
• When removing the magnetron, make sure that its
dome does not hit any adjacent parts, or it may be
damaged.
• 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.
• After replacing the magnetron, check for microwave
energy leakage with a survey meter Check
microwave energy leakage must be below the limit
of 5 mW/cm2. (All service adjustments should be
made for minimum microwave energy leakage
readings.)
7-8
Page 21
E. REMOVING STIRRER FAN
Figure 16
Figure 15
Figure 14
Door Screen
Figure 17
(Figures 14 and 15)
(1) Remove two screws securing it to the oven
upper plate by using drive screw.
(2) Rotate slightly and pull out the stirrer fan cover.
(3) Remove the stirrer fan.
F. REMOVING DOOR (Figure 16)
(1) Remove the vent grille by two screws securing it to
the outcase loosening.
(2) Lift up and draw the door.
NOTES:
• After replacing the door, be sure to check that the
primary interlock switch, the secondary interlock
switch and the interlock monitor switch is in good
operating normally.
• After replacing the door, check for microwave energy
leakage with a survey meter. Microwave energy
leakage must be below the limit of 5mW/cm2. (With a
275 ml water load)
G. DISASSEMBLING DOOR (Figure 17)
(1) Remove the dielectric choke by using knife
blade or small screw driver, etc.
(2) Remove two screws securing it to the door handle.
CAUTION: Be careful not to damage door seal
plate with the screwdriver.
7-9
Page 22
H. ASSEMBLING DOOR
Space
(1 or 2 screws)
MOUNT, ALL
Figure 18
Figure 19-a
Figure 19-b
Figure 20
Figure 19-c
(1) 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.
I. REMOVING THE VENTILATION MOTOR
(1) Remove the mounting plate by loosening
mounting plate screws (1 or 2 screws)
securing it to the back plate.
(See Figure 18)
(2) Remove MOUNT ALL loosening one screw
loosening one screw securing the ventilation Motor
and back plate. (See Figure 19-a)
(3) Carefully pull the ventilation motor ASS'Y out of
the microwave oven. (See Figure 19-b)
J. REPLACING THE HUMIDITY SENSOR
(For sensor model only)
(1) Remove the sensor by removing two screws
securing it to the air duct. (See Figure 19-c)
(2) Mount the new humidity sensor to the air duct.
K. REMOVING GRILL HEATER (Figure 20)
(1) Remove the out case.
(2) Remove the air duct by removing six screws
securing it to the oven front plate, guide air and
glasswool-L cover.
(3) Disconnect the wire leads of air duct.
(4) Remove the upper insulator by removing one
screw.
(5) Remove four screws securing the heater terminal
and two net screws securing the heater barrier.
(6) Remove the heater holding bracket and remove the
grill heater from the cavity.
7-10
Page 23
L. REMOVING THE TURNTABLE MOTOR
Wire Leads
Turntable Motor
Figure 22-b
Figure 20
Figure 23
Figure 21-a
(1) Remove the turntable.
(2) Remove the turntable shaft VERY CAREFULLY
with a slotted screwdriver. (Figure 21)
(3) Remove the base plate by removing 7 screws
securing it to the oven cavity. (Figure 22-a)
(4) Disconnect the leadwire from the turntable motor
terminals.
(5) Remove the 2 screws securing the turntable motor
to the oven cavity ASS'Y. (Figure 22-b)
M. REMOVING CONVECTION HEATER
AND THERMISTOR (Figure 23)
(1) Remove the out case.
(2) Remove the air duct by removing six screws
securing it to the oven front plate, guide air and
glasswool-L cover.
(3) Disconnect the wire leads of air duct.
(4) Remove the magnetron.
(5) Remove the latch board assembly.
(6) Remove the bottom plate by removing four screws.
(7) Remove the four net screws securing chamber
assembly.
(8) Lift the chamber assembly from the oven cavity.
(9) Remove three screws securing the heater of the
chamber assembly.
(10) Lift the convection heater from the chamber
assembly.
NOTES:
• Remove the leadwire from the turntable motor
VERY CAREFULLY.
• Be sure to grasp the connector not the wires when
removing.
7-11
Page 24
INTERLOCK SYSTEM
LATCH
LATCH BOARD
0-1/64"
0-1/64"
Latch Board
Primary
Interlock Switch
Monitor Switch
Interlock
Secondary
Interlock Switch
Figure 24-a
Figure 24-b
INTERLOCK MECHANISM
The door lock mechanism is a device which has been specially designed to eliminate completely microwave
activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave
leakage.
ADJUSTMENT PROCEDURES
To avoid possible exposure to microwave energy
leakage, adjust the door latches and interlock
switches, using the following procedure.
The Interlock Monitor and Secondary Interlock Switch
act 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.
Mounting of the primary/monitor/secondary switches to
the latch board.
CHECK THE DOOR LATCH AND SWITCH
CLOSING.
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 24-a.
(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 24-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.
NOTE:
To correct sequence of the Primary Interlock
Switch, Secondary Interlock Switch and the
Interlock Monitor Switch is very important.
If any gap is larger than 1/64" (0.5 mm), you will
need to adjust the latch board”. Go to step 3
and follow all steps in order.
ADJUST THE LATCH AND SWITCH CLOSING
(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).
Hold the latch board tightly in this position until you
check the sequence of the switches in steps 5
and 6.
7-12
Page 25
TEST THE LATCH AND SWITCH SEQUENCE
(5) Open the oven door slowly. Watch the door latch,
the Secondary Switch. Release Rod and Lever
on the switches to make sure they are zero to the
body of the switches in the following sequence:
- Primary Interlock Switch
- Secondary Interlock Switch
- Interlock Monitor Switch
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:
- Interlock Monitor Switch
- Secondary Interlock Switch
- Primary Interlock Switch
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.
(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
Make sure the microwave energy leakage is below the
limit of 1mW/cm2(with a 275 ml water load) and
5mW/cm2(with a 275 ml water load without the
cabinet) when measured with a survey meter.
7-13
Page 26
INTERLOCK CONTINUITY TEST
A. PRIMARY INTERLOCK SWITCH TEST
When the door is opened slowly, an audible click
should be heard at the same time or successively
at intervals and 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.
When the primary switch operation is abnormal,
make the necessary adjustment or replace the
switch only with the same type of switch.
B. SECONDARY INTERLOCK SWITCH TEST
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.
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 Check for continuity of the Door Door
(Wire leads removed) switch with an Ohm-meter open closed
Primary
Switch
Monitor
Switch
Secondary
Switch
COM
COM
NO
NC
COM
NO
NOTE: After checking for the continuity of switches, make sure that they are
connected correctly.
WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION
EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS.
TYPE NO. SZM-V16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH
TYPE NO. SZM-V16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH
TYPE NO. SZM-V16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH
7-14
Page 27
TEST AND CHECKOUT PRECEDURES AND TROUBLESHOOTING
Primary
Winding
Secondary
Winding
Filament
Winding
Figure 24
- CAUTIONS -
- DISCONNECT THE POWER SUPPLY CORD
FROM THE WALL OUTLET WHENEVER
REMOVINGING THE CABINET FROM THE UNIT.
PROCEED WITH THE TESTS ONLY AFTER
DISCHARGING THE HIGH VOLTAGE CAPACITOR
AND REMOVING THE WIRE LEADS FROM THE
PRIMARY WINDING OF THE HIGH VOLTAGE
TRANSFORMER. (SEE FIGURE 24)
- 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 TEST PROCEDURES RESULTS
MAGNETRON
(Wire leads are
removed)
HIGH-VOLTAGE
TRANSFORMER
(Wire leads are
removed)
1. Remove wire leads. Install the magnetron
seal in the correct position. Check that the
seal is in good condition.
2. Measure resistance. (ohm meter scale:Rx1)
• Filament terminal
3. Measure resistance. (ohm meter scale:Rx1000)
• Filament to chassis
1. Remove wire leads.
2. Measure resistance. (ohm meter scale: Rx1)
• Primary winding
• Secondary winding
• Filament winding
3. Measure resistance. (ohm meter scale:
Rx1000)
• Primary winding to ground
• Filament winding to ground
Normal reading:
Less than 1 ohm.
Normal reading:
Infinite ohms.
NOTE: Replace the magnetron, if the
magnetron checks and all of the
high voltage component tests are
good, but the unit still does not heat
a load.
Normal readings:
Approx. 0.3 to 0.5 ohm.
Less than 0.1 ohm.
Approx. 65 to 120 ohms.
Normal readings:
Infinite ohms.
Infinite ohms.
NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS
SERVICED FOR ANY REASON.
7-15
Page 28
COMPONENTS TEST PROCEDURES RESULTS
Figure 25-a
Figure 25-b
Figure 26-a
Figure 26-b
HIGH-VOLTAGE
CAPACITOR
HIGH-VOLTAGE
DIODE
1. Remove wire leads.
2. Measure resistance. (ohm meter scale:
Rx1000)
(1) Terminal to terminal
Ohm-meter
(2) Terminal to case
Ohm-meter
1. Measure continuity. Forward.
(ohm meter scale: Rx1000)
Normal:
Momentarily indicates several ohm, and
then gradually returns to infinite
Normal: Infinite.
Normal:Continuity.
Abnormal: Infinite.
HEATER ELEMENT
Ohm-meter
1. Measure continuity. Reverse.
(ohm meter scale: Rx1000)
Ohm-meter
1. Remove wire leads.
2. Measure resistance.
(ohm meter
scale:Rx1)
Normal: Infinite.
Abnormal: Continuity.
Normal: Approximately
Conv. HTR
15-25
Abnormal: Infinite or several.
Grill HTR
25-30
7-16
Page 29
COMPONENTS TEST PROCEDURES RESULTS
For Model AMV6177AAB
AMV6177AAQ
AMV6177AAS
AMV6177AAW
Figure 27
1
2
3
Figure 29
1
2
3
4
5
6
7
8
9
10
11
12
13
Figure 28
TOUCH KEY
BOARD
Measure the resistance between terminal
pins of connector KEY CONNECTOR.
NOTE:
When reconnecting the FPC connector,
make sure that the holes on the FPC
connector are properly engaged with hooks
on the plastic fastener.
MATRIX CIRCUIT FOR
TOUCH KEY BOARD
CONNECTOR(KEY CON)
Resistance
value
FPC CONNECTOR
When
touched
Less than
400 ohms
Top
When not
touched
More than
1 mega ohm
SENSOR
(For sensor model only)
1. Remove the 3 pin connector from PCB.
2. Measure resistance across pins 1 & 2.
3. Across pins 2 & 3.
(ohm meter scale:Rx1)
7-17
Normal:
Approximately
1 & 2
3.1 Kohm
at 68 ± 35°F
Abnormal:
Infinite or several.
2 & 3
∞
Page 30
COMPONENTS TEST PROCEDURES RESULTS
FAN MOTOR
DAMPER MOTOR
CIRCULATION
MOTOR
VENTILATION MOTOR
SYNCHRONOUS
MOTOR
1. Remove wire leads.
2. Measure resistance.
(ohm meter scale: Rx1)
1. Remove wire leads.
2. Measure resistance.
(ohm meter scale: Rx1)
1. Remove wire leads.
2. Measure resistance.
(ohm meter scale: Rx1000)
Normal:
Approximately
Fan
35-55
ohm
Abnormal:
Infinite or several.
Normal:
Approximately 25 to 45 ohm
Normal:
Approximately 3 to 4 Kohm
Damper
2.5-3.5
Kohm
Cir
25-40
ohm
THERMISTOR
1. Remove the connector from PCB.
2. Measure resistance across pins 1 & 3.
(ohm meter scale: Rx1)
Abnormal:
Infinite or several.
Normal:
Approximately
250 to 350 Kohm at 68 ± 35°F
Abnormal:
Infinite or several.
7-18
Page 31
COMPONENTS TEST PROCEDURES RESULTS
RELAY 8
1. Measure continuity.
(ohm meter scale: Rx1)
2. Remove the lead wires and operate
oven at power level 1 through power
level 10.
• A MICROWAVE ENERGY 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.
1. Measure continuity.
(ohm meter scale: Rx1)
2. Remove the lead wires
and operate oven at
Convection Cooking.
Convection
Cooking Start
OFF
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.
Fuse blows immediately after
the door is opened.
Fuse blows when the door is closed and START
key is touched.
Improper operation of the primary interlock, secondary
interlock switches and/or the interlock monitor switch.
Malfunction of the high voltage transformer; the high
voltage capacitor including the diode, the magnetron,
the blower motor or the circuit board.
NOTES:
• If the fuse is blown by an improper switch operation, replace the all Interlock switches, PCB Ass’y and the
fuse at the same time. After replacing the the all Interlock switches, PCB Ass’y, Fuse with new ones, make
sure that they are correctly connected.
• Check for microwave energy leakage according to INTERLOCK ADJUSTMENT PROCEDURES on page 712 when the primary interlock, secondary interlock switches and/or the interlock monitor switches are
adjusted or replaced.
7-19
Page 32
(2) CHECKOUT PROCEDURES FOR RELAY.
- PROBLEM (A) -
FAN motor and oven lamp turn on without touching
START key when the door is closed.
NO
GOOD
YES
Remove the mate connector of I/O
CON from the circuit board.
Does the unit still operate?
NO
Replace the
circuit board
Defective
RELAY1
Replace
RELAY1
YES
- PROBLEM (B) -
FAN motor and oven lamp turn on When the door is
closed and START key is touched.
7-20
YES
GOOD
NO
Measure the voltage at pin NO.
35 of U01
Voltage reading: 0 Vdc
10 of U03
Voltage reading: about 15V
NO
Defective
Replace the
circuit board
RELAY1 or poor
connection of
RELAY1
Replace
RELAY1 or correct
the connection.
YES
Page 33
(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.
2) The unit with a normal relay continuously operates.
3) Proper temperature measurement is not obtained.
4) The buzzer does not sound or continues to sound.
5) Some segments of one or more digits do not light
up, or they continue to light up, or segments light
when they should not.
NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS
SERVICED FOR ANY REASON.
6) Wrong figures appear.
7) The figures of all digits.
8) Some of the indicators do no flicker light up.
9) The clock does not keep time properly.
7-21
Page 34
plugged into wall outlet.
2. FUSE (See CHECKOUT PROCEDURES FOR FUSE BLOWING: on page 7- 18)
3. OVEN CAVITY THERMOSTAT
Check: 1. POWER SUPPLY
PROBLEM - A: PLEASE SET TIME OF DAY does not appear in display window when power supply cord is
C. TROUBLE SHOOTING
Before following this troubleshooting read TRIAL OPERATION on page 6- 1.
• DISPLAY Problems, A thru C
• HELP UP Problems, D thru E • BUZZER Problems, F
1
7-22
correct indications when programmed.
PROBLEM - B: Display does not show correct numbers and/ or
1
Page 35
no heating is produced in oven load.
Check: 1. TOUCH KEY BOARD (START KEY FUNCTION)
PROBLEM - C: Display does not start countdown when START key is touched.
1
Check: 1. AIR VENTS
PROBLEM - D: Unit operation seems to be normal but
1
7-23
Page 36
START key is touched for HIGH POWER cooking.
2. THERMOSTAT
Check: 1. PRIMARY AND SECONDARY INTERLOCK SWITCHES
PROBLEM - E: Unit does not heat up even if display counts down when
1
2
7-24
Page 37
stages or at end of cooking
PROBLEM - F: No buzzing when touching the key, between
1
7-25
Page 38
2. FUSE
Check: 1. POWER SUPPLY
PROBLEM - G: Ventilation fan does not operate when FAN HIGH/ LOW key is touched.
1
7-26
Page 39
#EV#
EXPLODED VIEW
DOOR PARTS
FOR MODEL: AMV6177AAB
AMV6177AAQ
AMV6177AAW
1005
1003
1009
1011
1000
W105
1008
W109
Serial Number ldentification
(Figure Check First & Second)
ex) 1 0
W150
1004
1006
1007
FOR MODEL: AMV6177AAS
1005
1008
1381
1000
1009
1011
1004
W106
1006
1007
W105
8-1
Page 40
#EV#
* 07
* 07
2004
2004
2000
2002
2381
2381
2006
2006
2008
2018
W130
W105
W138
2008
2018
* Check the
Serial No.
* Check the
Serial No.
CONTROLLER PARTS
FOR MODEL: AMV6177AAB
AMV6177AAQ
AMV6177AAW
10
Serial No.
Check the rating label of Model
and order SVC parts according to
the Serial No.
FOR MODEL: AMV6177AAS
8-2
Page 41
#EV#
* 07
* 07
2004
2004
2000
2002
2381
2381
2006
2006
2008
W130
W105
W138
2008
* Check the
Serial No.
* Check the
Serial No.
CONTROLLER PARTS
FOR MODEL: AMV6177AAB
AMV6177AAQ
AMV6177AAW
11
Serial No.
Check the rating label of Model
and order SVC parts according to
the Serial No.
FOR MODEL: AMV6177AAS
8-3
Page 42
#EV#
W108
W108
3031
3001
3103
3029
3005
W178
W202
3024
3010
W138
W138
W142
For Model
AMV6177AAB
AMV6177AAS
For Model
AMV6177AAW
AMV6177AAQ
W142
3026
3011
3025
W121
3006
3032
W105
3009
3045
3037
6000
OVEN CAVITY PARTS
8-4
Page 43
#EV#
4001
4000
4002
W111
4003
4002
4004
LATCH BOARD PARTS
8-5
Page 44
#EV#
INTERIOR PARTS (I)
3048
3002
5411
3012
3008
3034
W125
W124
W109
W141
5403
W121
5024
5062
3206
W109
3207
W121
5021
W101
W105
5023
5029
5049
5003
5007
5008
W109
5002
5012
5009
W110
5052
5000
5018
W101
W109
5035
5407
W124
W121
W141
3208
5402
5401
W108
9002
9001
5028
W105
W105
5039
W150
8-6
4009
5409
W123
5068
W105
W123
5705
W121
W101
5019
5404
Page 45
#EV#
*01
*04
3045
5045
W117
W117
5056
3021
W109
5011
3033
5037
3027
5410
W150
5016
3051
5006
5010
5001
5017
W105
5014
W101
W109
W150
W109
W109
* Check the
Serial No.
* Check the
Serial No.
INTERIOR PARTS (II - I)
10
Serial No.
Check the rating label of Model
and order SVC parts according to
the Serial No.
8-7
Page 46
#EV#
*01
*04
3045
5045
W117
W117
5056
3021
W109
5011
3033
5037
3027
5410
W150
5016
3051
5006
5010
5001
5041
W144
5014
W101
2018
W109
W150
W109
W109
* Check the
Serial No.
* Check the
Serial No.
* Check the
Serial No.
INTERIOR PARTS (II - II)
11
Serial No.
Check the rating label of Model
and order SVC parts according to
the Serial No.
8-8
Page 47
#EV#
VINYL
BAG
6011
6009
6010
6008
INSTALLATION PARTS
8-9
Page 48
P/NO : 3828W5S4606
Printed in Korea
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