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R-9H56
SHARP CORPORATION
SER VICE MANU AL
In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
MODEL
R-9H56
S8409R9H56PJ/
CO VECTION
MICROWAVE OVEN
TABLE OF CONTENTS
Page
CAUTION, MICROWAVE RADIATION ................................................................................................................ 1
WARNING..............................................................................................................................................................1
PRODUCT SPECIFICATIONS............................................................................................................................. 2
GENERAL INFORMATION ................................................................................................................................... 2
APPEARANCE VIEW........................................................................................................................................... 3
OPERATION SEQUENCE ................................................................................................................................... 4
FUNCTION OF IMPORTANT COMPONENTS .................................................................................................... 7
SERVICING ........................................................................................................................................................ 10
TEST PROCEDURE .......................................................................................................................................... 12
TOUCH CONTROL PANEL ................................................................................................................................ 21
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE............................................................... 27
MICROWAVE MEASUREMENT ........................................................................................................................ 32
WIRING DIAGRAM ............................................................................................................................................. 33
PICTORIAL DIAGRAM....................................................................................................................................... 35
CONTROL PANEL CIRCUIT .............................................................................................................................. 36
PRINTED WIRING BOARD ................................................................................................................................ 37
PARTS LIST........................................................................................................................................................ 38
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R-9H56
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R-9H56
1
SER VICE MANUAL
PRODUCT SPECIFICATIONS
SHARP CORPORATION
OSAKA, JAPAN
CAUTION
MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO RADIATION FROM
THE MICROWAVE GENERATOR OR OTHER PARTS
CONDUCTING MICROWAVE ENERGY.
Service engineers should not be exposed to the microwave
energy which may radiate from the magnetron or other
microwave generating devices if it is improperly used or
connected. All input and output microwave connections,
waveguides, flanges and gaskets must be secured. Never
operate the device without a microwave energy absorbing
load attached. Never look into an open waveguide or
antenna while the device is energized.
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is not any other visible damage with the oven.
Servicing and repair work must be carried out only by trained
service engineers.
All the parts marked "*" on parts list are used at voltages more
than 250V.
Removal of the outer wrap gives access to potentials above
250V.
All the parts marked "∆" on parts list may cause undue
microwave exposure, by themselves, or when they are damaged, loosened or removed.
CONVECTION
MICROWAVE OVEN
R-9H56
GENERAL IMPORTANT INFORMATION
This Manual has been prepared to provide Sharp Corp. Service
engineers with Operation and Service Information.
It is recommended that service engineers carefully study the
entire text of this manual, so they will be qualified to render
satisfactory customer service.
TEST PROCEDURE
SERVICING AND
TROUBLESHOOTING CHART
FUNCTION OF IMPORTANT
COMPONENTS
OPERATING SEQUENCE
APPEARANCE VIEW
MICROWAVE MEASUREMENT
WIRING DIAGRAM
PARTS LIST
TOUCH CONTROL PANEL
ASSEMBLY
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
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PRODUCT SPECIFICATIONS
ITEM DESCRIPTION
Power Requirements 240 Volts
50 Hertz
Single phase, 3 wire earthed
Power Consumption 1500 W (Microwave)
1600 W (Convection)
Power Output 750 watts nominal of RF microwave energy (AS 2895 1986)
850 watts (IEC-705-1988 )
Operating frequency of 2450MHz
Convection heater 1500 W
Case Dimensions Width 627mm
Height 378mm
Depth 483mm
Cooking Cavity Dimensions Width 410mm
Height 245mm
Depth 410mm
Control Complement Touch Control System
Clock ( 1:00 - 12:59)
Timer (0 - 99 min. 99 sec.)
Microwave Power for Variable Cooking
Repetition Rate;
HIGH................................................. Full power throughout the cooking time
MED HIGH........................................................... approx. 70% of Full Power
MED...................................................................... approx. 50% of Full Power
MED LOW (DEFROST) ........................................approx. 30% of Full Power
LOW ..................................................................... approx. 10% of Full Power
Convection Temperature for Variable Cooking
CONVECTION...................................................... 40 to 250˚C Temp. control
LOW MIX(BAKE) ..................................180˚C with 10% of microwave power
HIGH MIX(ROAST)...............................200˚C with 30% of microwave power
GRILL ................................................................................... 250˚C (Preheat)
SENSOR INSTANT ACTION pads
MULTI COOK pad
REHEAT SENSOR pad
CONVECTION COOKING FUNCTION pads
EASY DEFROST pad
NUMBER and TEMPERATURE pads
POWER LEVEL pad
MORE. LESS pads
STOP/CLEAR pad
AUTO START/CLOCK pad
INSTANT COOK/START pad
Set Weight Approx. 29 kg
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APPEARANCE VIEW
1
11
14
15
1
11
12
3
4
5
9
10
2
13
4
6
7
8
1. Ventilation opening
2. Oven lamp
3. Door hinges
4. Door safety latches
5. See through door
6. Door open button
7. Touch control panel
8. Digital readout
9. Wave guide cover
10.Coupling
11.Access cover for oven lamp replacement
12.Menu label
13.Rating label
14. low rack
15.High rack
TOUCH CONTROL PANEL
SMART
& EASY
REHEART
SENSOR
LOW MIX
HIGH MIX GRILL
CONVEC
LESS MORE
12345
67890
STOP
CLEAR
AUTO
START
CLOCK
INSTANT COOK
START
40˚C 70˚C 130˚C 150˚C 160˚C
180˚C 200˚C 220˚C 230˚C 250˚ C
MULTI
COOK
Fresh
Vegetables
Reheat
Pie
Jacket
Potato
Frozen
Vegetables
Casseroles
Desserts
POWER
LEVEL
EASY
DEFROST
CONV
GRILL
MIX
REHEAT
TEMP
COOK
LOW M.LOW MED M.HIGH HIGH
Convection
Fan Symbol
Micro/Defrost
Symbol
Indicator
DEFROST
AUTO
Pcs kg
MULTI COOK PAD
Press to select Multi Cook mode.
REHEAT SENSOR PAD
Press to select 3 popular Reheat
menus.
SENSOR INSTANT ACTION PADS
Press once to cook or reheat 6
popular menus.
CONVECTION COOKING
FUNCTION PADS
Press to cook for each function.
MORE( ), LESS( ) PADS
Press to increase/decrease the time
in one minute increments during
cooking or to alter the doneness for
the Sensor Instant Action, Reheat
Sensor, Multi Cook or Easy Defrost
mode.
INSTANT COOK/START PAD
Press once to cook for 1 minute at
HIGH or increase by 1 minute
multiples each time this pad is
pressed Microwave, Convection,
Grill or Mix cooking.
AUTO START/CLOCK PAD
Press to set clock or Auto Start time.
STOP/CLEAR PAD
Press to clear during programming.
Press once to stop operation of
oven during cooking; press twice
to cancel cooking programe.
NUMBER AND TEMPERATURE
PADS
Press to enter cookling times, clock
time, convection temperature or to
select the Multi Cook menus.
EASY DEFROST PAD
Press to defrost meat by entering
weight only.
POWER LEVEL PAD
Press to select microwave power
setting. If not pressed, HIGH is
automatically selected.
SENSOR
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OPERATION SEQUENCE
The following is a description of component functions during
oven operation.
Relay and Components Connection
RELAY CONNECTED COMPONENT
RY1 Oven lamp/ Turntable motor
RY2 Power transformer
RY3 Convection heater
RY4 Damper motor
RY5 Convection motor
RY6 Fan motor
OFF CONDITION
Closing the door activates all door interlock switches: upper
latch switch, lower latch switch and stop switch. (In this
condition, the monitor switch contacts are closed.)
When oven is plugged in a wall outlet (240V 50Hz), 240volts
A.C. is supplied to the control unit. (Figure O-1):
1. The display flashes “88:88”.
To set any programmes or set the clock, you must first
touch the STOP/CLEAR pad.
“ : “ appears in the display and the time counts up every
minute.
NOTE: When the oven door is opened, the oven lamp
comes on at this time.
2. A signal is input to the control unit, energizing the coil of
shut-off relay (RY4).
RY4 contacts close, completing a circuit to the damper
motor. The damper motor mow operates moving the
damper to the open position, thereby closing the contacts
of damper switch inputs a signal to the control unit.
The coil of relay RY4 is de-energized, opening its contacts,
thereby turning off the damper motor.
MICROWAVE COOKING CONDITION
HIGH COOKING
Program desired cooking time and Variable Cooking Control with the touching NUMBER pads and the POWER
LEVEL pad. When the START pad is touched, the following
operations occur:
1. The contacts of relays are closed and components
connected to relays are turned on (RY1, RY2, RY6).
(Figure O-2)
2. 240 volts A.C. is supplied to the primary winding of the
power transformer. The voltage is converted to about
3.35 volts A.C. output on the filament winding and high
voltage of approximately 2120 volts A.C. on the high
voltage winding.
3. The filament winding voltage (3.35 volts) heats the
magnetron filament and the high voltage (2120 volts) is
sent to the voltage doubling circuit.
4 The 2450 MHz microwave energy produced in the
magnetron generates a wave length of 12.24 cm. This
energy is channelled through the waveguide (transport
channel) into the oven cavity, where the food is placed to
be cooked.
5. Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off and the
generation of microwave energy is stopped. The oven
will revert to the OFF condition..
6 When the door is opened during a cook cycle, the
monitor switch, upper latch switch, lower latch switch
and stop switch are activated with the following results.
The circuits to the turntable motor, cooling fan motor and
high voltage components are de-energized, the oven
lamp remains on and the digital read-out displays the
time still remaining in the cook cycle when the door was
opened.
7. The monitor switch is electrically monitoring the operation
of the upper latch switch and lower latch switch and is
mechanically associated with the door so that it will
function in the following sequence.
1) When the door opens from a closed potion, the upper
latch switch and the lower latch switch open their contacts,
and then the monitor switch contacts close.
2) When the door is closed, from the open position, the
monitor switch contacts first open, and then the contacts
of the upper latch switch and lower latch switch must be
closed.
If the common and normal open contacts of upper latch
switch and the lower latch switch fail with their contacts
closed when the door is opened, the closing of the monitor
switch contacts will form a short circuit through the fuse,
upper latch switch and the lower latch switch, causing the
monitor fuse to blow.
MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW
COOKING
When variable cooking power is programmed, the 240 volts
A.C. is supplied to the power transformer intermittently
through the contacts of the relay (RY2) which is operated by
the control unit within a 32-second time base. Microwave
power operation is follows:
VARI MODE ON TIME OFF TIME
HIGH (100% power) 32 sec. 0 sec.
MED HIGH (approx. 70% power) 24 sec. 8 sec.
MED (approx. 50% power) 18 sec. 14sec.
MED LOW (approx. 30% power) 12 sec. 20 sec.
LOW (approx. 10% power) 6 sec. 26 sec.
NOTE: The ON/OFF time ratio does not exactly correspond
to the percentage of microwave power, because
approx. 2 seconds are needed for heating up the
magnetron filament.
CONVECTION COOKING CONDITION
PREHEATING CONDITION
Program desired convection temperature by touching the
CONVECTION pad and the temp. pad. When the START
pad is touched, the following operations occur:
1. The coil of shut-off relays RY1+RY5+RY6 are energized,
the oven lamp, cooling fan motor, turntable motor and
convection motor are turned on.
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2. The coil of relay (RY4) is energized by the CPU unit. The
damper is moved to the closed position, opening the
damper switch contacts. The opening of the damper
switch contacts sends a signal to the LSI on the CPU unit
de-energizing the relay (RY4) and opening the circuit to
the damper motor.
3. The coil of heater relay (RY3) is energized by the CPU
unit and the main supply voltage is added to the convection
heater.
4. When the oven temperature reaches the selected preheat
temperature, the following operations occur:
4-1. The heater relay (RY3) is de-energized by the CPU
unit temperature circuit and thermistor, opening the
circuit to the convection heater.
4-2. The oven will continue to function for 15 minutes,
turning the convection heater on and off, as needed to
maintain the selected preheat temperature. The oven
will shut-down completely after 15 minutes.
CONVECTION COOKING CONDITION
When the preheat temperature is reached, a beep signal will
sound indicating that the holding temperature has been
reached in the oven cavity. Open the door and place the
food to be cooked in the oven. Program desired cooking
time and convection temperature by touching the number
pad, CONVECTION pad and Temperature pad. When the
START pad is touched, the following operations occur:
1. The numbers of the digital read-out start the count down
to zero.
2. The oven lamp, turntable motor, cooling fan motor and
convection motor are energized.
3. Heater relay (RY3) is energized (if the cavity temperature
is lower than the selected temperature) and the main
supply voltage is applied to the convection heater to
return to the selected cooking temperature.
4. Upon completion of the cooking time, the audible signal
will sound, and oven lamp, turntable motor, cooling fan
motor and convection motor are de-energized. At the
end of the convection cycle, if the cavity air temperature
is above 116˚C, the circuit to (RY6) will be maintained (by
the thermistor circuit) to continue operation of the cooling
fan motor until the temperature drops below 116˚C, at
which time the relay will be de-energized, turning off the
fan motor. Relay (RY5) will however, open as soon as
the convection cycle has ended, turning off the convection
fan motor. This will now cool and allow the damper door
to open.
5. At the end of the convection cook cycle, shut-off relay
(RY4) is energized turning on the damper motor. The
damper is returned to the open position, closing the
damper switch contacts which send a signal to the
control unit, de-energizing shut-off relay (RY4).
AUTOMATIC MIX COOKING CONDITION
Program desired cooking time and temperature by touching
the number pads and the LOW MI or HIGH MIX pad. When
the START pad is touched, the following operations occur:
1. The numbers of the digital read-out start the count down
to zero.
2. The shut-off relay (RY1+RY5+RY6) energized, turning
on the oven lamp, turntable motor, cooling fan motor and
convection motor.
3. The shut-off relay (RY4) is energized.
The damper door is closed from the open position.
4. The heater relay (RY3) is energized, adding the mains
supply voltage to the convection heater.
5. Now, the oven is in the convection cooking condition.
6. When the oven temperature reaches the selected
temperature, the following operations occur:
6-1. The power supply voltage is added to the convection
heater and power transformer alternately.
6-2. The convection heater operates through the heater
relay (RY3) contacts and the power transformer operates
through the cook relay (RY2) contacts.
6-3. These are operated by the CPU unit to supply alternately
within a 32 second time base, convection heat and
microwave energy.
The relationship between the convection and microwave
power operations are as follows.
Note: The ON and OFF time ratio does not correspond
with the percentage of microwave power, because
approx. 2 seconds are needed for heating of the
magnetron filament.
12 SEC. 20 SEC.
32 SEC.
LOW MIX
BAKE
HIGH MIX
ROAST
MICROWAVE POWER
= APPROX. 30%
CONVECTION
TEMPERATUE
= 300˚F
MICROWAVE POWER
= APPROX. 10%
CONVECTION
TEMPERATUE
= 350˚F (180˚C)
26 SEC.6 SEC.
ON
ON
OFF
OFF
OFF
ON
(MICRO.)
(CONVEC.)
(MICRO.)
(CONVEC.)
Note: During alternate Microwave/Convection operation,
the convection heater is energized only if the cavity
temperature drops below the set temperature.
ABSOLUTE HUMIDITY SENSOR (AH SENSOR)
COOKING CONDITION
In case where the AH sensor is used (REHEAT SENSOR or
SENSOR INSTANT ACTION), the foods are cooked in
microwave cooking mode without figuring time, power level
or quantity. When the oven senses enough steam from the
food, it relays the information to its microprocessor which
will calculate the remaining cooking time and power level
needed for best results.
When the food is cooked, water vapour is developed. The
sensor “senses” the vapour and its resistance increases
gradually. When the resistance reaches the value set according to the menu, supplementary cooking is started.
The time of supplementary cooking is determined by experi-
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AH SENSOR COOKING SEQUENCE
1. In case the AH sensor cooking condition is started, the
coil of shut-off relays (RY1+RY6) are energized, the
oven lamp and cooling fan motor are turned on, but the
power transformer is not turned on.
NOTE: The oven should not be operated on AH SENSOR
COOKING immediately after plugging in the unit.
Wait five minutes before cooking on AH SENSOR
COOKING CONDITION.
2. After about 16 seconds, the cook relay (RY2) is energized.
The power transformer is turned on, microwave energy
is produced and first stage is started. The 16 seconds is
the cooling time required to remove any vapour from the
oven cavity and sensor.
Figure O-2
NOTE: During this first stage, do not open the door or touch
STOP/CLEAR pad.
3. The oven will go to the Mix Cooking Condition at the 2nd.
or 3rd. stage when Reheat pie, Casseroles or Desserts
has been chosen. (Figure O-4)
4. When the sensor detects the vapour emitted from the
food, the display switches over to the remaining cooking
time and the timer counts down to zero. At this time, the
door may be opened to stir food, turn it or season, etc.
NOTE: In case where a small quantity of food is cooked, the
oven will stop without displaying the remaining
cooking time.
5. When the timer reaches zero, an audible signal sounds.
The shut-off relay (RY1+RY6) and cook relay (RY2) are
de-energized and the power transformer, oven lamp,
etc. are turned off.
6. Opening the door or touching the STOP/CLEAR pad, the
time of day will reappear on the display and the oven will
revert to an OFF condition.
MULTI COOK
MULTI COOK will automatically compute the oven temperature, microwave power and cooking time for baking and
roasting. Set the desired program by touching the MULTI
COOK pad, and number pad. Enter the weight by touching
the Number pads. When the START pad is touched, the
following operations occur:
1. The COOK indicator will light and the Microwave Symbol
and/or the Convection Fan Symbol will rotate.
2. The cooking time will appear on the display and start
counting down to zero. The cooking time is adjusted
automatically according to the weight of the food.
3. The shut-off relays (RY1, RY3, RY5 and RY6) are
energized, turning on the oven lamp, turntable motor,
cooling fan motor and convection motor. The power
supply voltage is added to the convection heater.
4. Now, the oven is in the convection cooking mode.
5. When the oven temperature has reached the programmed
convection temperature, the oven goes into the
programmed cooking mode.
6. At the end of the MULTI COOK cycle, the damper is
returned to the open position and the oven will go to the
off condition. The cooling fan will remain on until the oven
has cooled.
EASY DEFROST COOKING
The EASY DEFROST key is a special function key to defrost
meats and poultry faster and better.
EASY DEFROST key has 4 defrost stages.
EASY DEFROST automatically defrosts roast beef, etc.
When EASY DEFROST is selected and the food weight is
entered by using the number pads, the oven will cook
according to the special cooking sequence. (Figure O-2)
FIRE SENSING FEATURE (MICROWAVE MODE)
This model incorporates a sensing feature which will stop
the oven's operation if there is a fire in the oven cavity during
microwave cooking.
This accomplished by the LSI repeatedly measures the
voltage across the temperature measurement circuit (thermistor) during it's 32-seconds time base comparing the
obtained voltage measurements. If the most recent voltage
measured is 300mV grater than the previous voltage measured, the LSI judges it as a fire in the oven cavity and
switches off the relays to the power transformer, fan motor
and convection motor. The LSI also stops counting down
and closes the damper door so that no fresh air will enter the
oven cavity. Please refer to the following section for a more
detailed description.
Operation
Please refer to the timing diagrams below.
1. The thermistor operates within a 32-seconds time base
and it is energized for three (3) seconds and off for 29
seconds. Two (2) seconds after the thermistor is
energized, the voltage across the temperature
measurement circuit is sampled by the LSI and twenty
one (21) seconds after the thermistor is cut off the LSI
turns on the cooling fan for six (6) seconds.
2. The above procedure is repeated. If the difference
between the first voltage measured (in step 1) and the
voltage measured when the procedure is repeated (step
2) is greater than 300mV the LSI makes the judgment
that there is a fire in the oven cavity and will switch off the
relays to the power transformer, fan motor and convection
motor. The LSI also stops counting down and closes the
damper door so that no fresh air will enter the oven
cavity.
ment with each food category and inputted into the LSI.
An example of how sensor works:
1. Potatoes at room temperature.
Vapour is emitted very slowly.
2. Heat potatoes. Moisture and
humidity is emitted rapidly. You
can smell the aroma as it cooks.
;
3. Sensor detects moisture and
humidity and calculates
cooking time and variable
power.
MICROWAVE
MICROWAVE
AH SENSOR
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3. Once the fire sensor feature has shut the unit down, the
programmed cooking cycle may be resumed by pressing
the "START" pad or the unit may be reset by pressing the
"CLEAR" pad.
IMPORTANT:
During sensor cooking operation, the fire sensing operation sequence will not begin until the AH sensor has
detected vapours and initiated a sensor cooking cycle.
This is because the operation of the convection fan
would interfere with the AH sensor's vapour detection.
CONVECTION
MOTOR
THERMISTOR
Sensing
Voltage
ON
OFF
ON
OFF
ON
OFF
0 2 24 30 64 (sec.)
3 sec.
Sensing the voltage across the temperature measurement circuit.
6 sec.
3
32 (sec.)
UPPER AND LOWER LATCH SWITCHES
Those latch switches are mounted in the latch hooks as
shown in figure. They are activated by the latch heads on the
door.
When the door is opened, the switches interrupt the circuit
to all components except CPU unit and relay unit and oven
lamp. A cook cycle cannot take place until the door is firmly
closed thereby activating both interlock switches.
LATCH HOOK
STOP SWITCH
MONITOR SWITCH
SWITCH LEVER
OPEN LEVER
LATCH
HEADS
DOOR OPEN
BUTTON
UPPER LATCH SWITCH
LOWER LATCH SWITCH
Figure D-1. Switches
MONITOR SWITCH
The monitor switch is mounted on the latch hook. It is
activated (the contacts opened) by the lower latch head
when the door is closed. The switch is intended to render the
oven inoperative by means of blowning the fuse when the
contacts of the common and normal open contacts of upper
latch switch and lower latch switch
fail to open when the door is opened.
Functions:
1. When the door is opened, the monitor switch contacts
close (to the ON condition) due to their being normally
closed. At this time the common and normal open
contacts of upper latch switch and lower latch switch are
in the OFF condition (contacts open) due to their being
normally open contacts switch.
2. As the door goes to a closed position, the monitor switch
contacts are first opened and then the common and
normal open contacts of upper latch switch close. (On
opening the door, each of these switches operate
inversely.)
3 If the door is opened during cooking, and the common
and normal open contacts of upper latch switch and
lower latch switch fail to open, the fuse blows
simultaneously with closing of the monitor switch contacts.
CAUTION: BEFORE REPLACING A BLOWN FUSE TEST
THE UPPER LATCH SWITCH, LOWER LATCH
SWITCH AND MONITOR SWITCH FOR
PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”).
STOP SWITCH
The stop switch is activated by the latch head.
When the door is opened while the oven is in cook cycle, the
stop switch contacts open to de-energize the relay (RY1,RY-2,RY-3,RY-5,RY-6). Then the cook cycle is stopped.
THERMAL CUT-OUT 150˚C (OVEN)
The oven thermal cut-out located on the left side of the
thermal protection plate is designed to prevent damage to
the convection heater unit if an overheated condition develops in the tube due to cooling fan failure, obstructed air
ducts, dirty or blocked air intake, etc. Under normal operation, the oven thermal cut-out remains closed. However,
when abnormally high temperatures are reached within the
heater unit, the oven thermal cut-out will open, causing the
oven to shut down. When the oven has cooled temperature,
the oven thermal cut-out closes.
THERMAL CUT-OUT 95˚C (FAN MOTOR)
The thermal cut-out protect the fan motor against overheating. If its temperature goes up higher than 95˚C because the
fan motor is locked or the ventilation operating are blocked,
the contacts of the thermal cut-out will open and switch off
the oven. When the thermal cut-out cools itself down to
75˚C, the contacts of the thermal cut-out will close again.
TEMPERATURE FUSE 150˚C (MG)
This fuse protects the magnetron against overheating. If the
temperature goes up higher than 150˚C because the fan
motor is interrupted, the air inlet duct is blocked or the
ventilation openings are obstructed, the fuse blows and cuts
off the power supplying to the power transformer. The
defective fuse must be replaced with new rated one.
FUNCTION OF IMPORTANT COMPONENTS
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FUSE M8A 250V
1. If the wire harness or electrical components are shortcircuited, this fuse blows to prevent an electric shock or
fire hazard.
2. The fuse also blows when upper latch switch and lower
latch switch remain closed with the oven door open and
when the monitor switch closes.
3. The fuse M8A also blows when asymmetric rectifier,
H.V. rectifier, H.V. wire harness, H.V. capacitor,
magnetron or secondary winding of power transformer is
shorted.
ASYMMETRIC RECTIFIER
The asymmetric rectifier is a solid state device that prevents
current flow ins both directions. And it prevents the temperature rise of the power transformer by blowing the fuse M8A
when the high voltage rectifier is shorted.
FAN MOTOR
The fan motor drives a blade which draws external cool air.
This cool air is directed through the air vanes surrounding
the magnetron and cools the magnetron. This air is channelled through the oven cavity to remove steam and vapours given off from the heating foods. It is then exhausted
through the exhausting air vents at the oven cavity.
CONVECTION HEATER
The convection heater is located at the rear of the oven
cavity. It is intended to heat air driven by the convection fan.
The heated air is kept in the oven and force-circulated and
reheated by the convection heater.
CONVECTION COOKING SYSTEM
This oven is designed with a hot air heating system where
food is not directly heated by the convection heater, but is
heated by forced circulation of the hot air produced by the
convection heater. The air heated by the convection heater
is circulated through the convection passage provided on
the outer casing of the oven cavity by means of the convection fan which is driven by the convection motor. It then
enters the inside of the oven through the vent holes provided
on the left side of the oven. Next, the hot air heats the food
on the turntable and leaves the oven cavity through the vent
in the oven cavity left side wall. Without leaving the oven,
this hot air is reheated by the convection heater, passes
through the convection passage and enters the inside of the
oven cavity again, in a continuing cycle. In this way, the hot
air circulates inside the oven cavity to raise its temperature
and, at the same time, comes into contact with the food
being cooked. When the temperature inside the oven cavity
reaches the selected temperature, the convection heater is
de-energized. When the temperature inside the oven cavity
drops below the selected temperature, the convection heater
is energized again. In this way, the inside of the oven cavity
is maintained at approximately the selected temperature.
When the convection time reaches 0, the convection heater
is de-energized and the convection fan stops operating and
the oven shuts off. Upon completion of the cooking time, the
audible signal will sound, and oven lamp, turntable motor,
cooling fan motor and convection motor are de-energized.
At the end of the convection cycle, if the cavity air temperature is above 116˚C, the circuit to RY6 will be maintained (by
the thermistor circuit) to continue operation of the cooling
fan motor until the temperature drops below 116˚C, at which
time the relay will be de-energized, turning off the fan motor.
Relay RY5 will however, open as soon as the convection
cycle has ended, turning off the convection fan motor. This
will now cool and allow the damper door to open.
DAMPER OPEN-CLOSE MECHANISM
Usually, the damper is in the open position except during
convection cooking.
Damper position is set automatically by damper motor,
damper switch, motor cam and damper shaft.
These components are operated by a signal that judges if
microwave cooking or convection cooking operation is
selected by the CPU unit.
The rated peak reverse voltage of D1 of the asymmetric
rectifier is 6 KV The rated peak reverse voltage of D2 of the
asymmetric rectifier is 1.7 KV. D1 and D2 of the asymmetric
rectifier or high voltage rectifier are shorted when the each
peak reverse voltage goes beyond the each rated peak
reverse voltage. (The process of blowing the fuse M8A.) .
1. The high voltage rectifier is shorted by any causes when
microwave cooking.
2. The peak reverse voltage of D2 of the rectifier goes
beyond the rated peak reverse voltage 1.7 KV in the
voltagedoubler circuit.
3. D2 of the rectifier is shorted.
4. The large electric currents flow through the high voltage
winding of the power transformer.
5. The large electric currents beyond 8A flow through the
primary winding of the power transformer.
6. The fuse M8A blows by the large electric currents.
7. The power supply to the power transformer is cut off.
THERMISTOR
The thermistor is a negative temperature coefficient type.
The temperature in the oven cavity is detected through the
resistance of the thermistor, and then the control unit
causes the heating element relay to operate, thus the
current to the heating element is turned ON/OFF.
MONITOR RESISTOR
The monitor resistor prevents the fuse M8A 250V bursting
when the fuse M8A 250V blows due to the operation of the
monitor switch.
TURNTABLE MOTOR
The turntable motor drives the turntable supporting plate to
rotate the turntable.
CONVECTION MOTOR
The convection motor drives the convection fan and provides the heated air.
D2 D1
ASYMMETRIC
RECTIFIER
HIGH VOLTAGE RECTIFIER
AB
C
Page 11
R-9H56
9
Microwave Cooking:
Damper is in the open position, because a portion of cooling
air is channelled through the cavity to remove steam and
vapours given off from the heating foods.
It is then exhausted at the top of the oven cavity into a
condensation compartment.
Convection Cooking:
Damper is in the closed position, so that no hot air will be
allowed to leak out the oven cavity.
Damper Operation
1. When power supply cord is plugged in:
1-1. When power supply cord is plugged in, a signal is
sensed in the control unit, and operates shut-off relay
(RY4).
1-2. Contacts of shut-off relay (RY4) close, the damper
motor is energized, opening the damper door.
1-3. When the damper is moved to the open position by the
damper cam, damper switch is closed (ON position).
1-4. The signal of damper switch is re-sensed in the control
unit and shut-off relay (RY4) is turned off.
1-5. The 240 volts A.C. to the damper motor is stopped and
the motor turns off.
2. When oven is microwave cooking:
Damper is in the open position
3. When oven is convection cooking:
3-1 Damper motor is energized by touching the convection,
temperature and START pads.
3-2. When damper is in the closed position (damper switch
is OFF), its signal is sensed by the control unit, and
shut-off relay (RY4) is de-energized.
3-3. The damper is held in the closed position during the
convection cooking operation.
3-4. At the end of the convection cooking, shut-off relay
(RY4) is energized, and the damper is returned to the
open position.
NOTE: If the damper door is not in the proper position,
closed during convection or open during microwave,
the control unit will stop oven operation after 1
minute.
Cooking Mode Operation of Damper
Microwave cooking OPEN
Convection cooking CLOSE
Sensor cooking OPEN
Automatic mix cooking CLOSE
Grill cooking CLOSE
Slow cooking CLOSE
DAMPER DUCT
DAMPER
DAMPER CAM
DAMPER MOTOR
DAMPER SWITCH
DAMPER SHAFT
Figure D-2. Damper Mechanism
Page 12
R-9H56
10
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with any part of the
high voltage circuit will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High voltage
rectifier assembly, High voltage harness.
REMEMBER TO CHECK 3D
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Discharge high voltage capacitor.
WARNING: AGAINST THE CHARGE OF THE
HIGH-VOLTAGE CAPACITOR
The high-voltage capacitor remains charged about
60 seconds after the oven has been switched off.
Wait for 60 seconds and then short-circuit the connection of the high-voltage capacitor (that is, of the
connecting lead of the high-voltage rectifier) against
the chassis with the use of an insulated screwdriver.
Sharp recommend that wherever possible fault-finding
is carried out with the supply disconnected. It may in,
some cases, be necessary to connect the supply after
the outer case has been removed, in this event carry out
3D checks and then disconnect the leads to the primary
of the power transformer. Ensure that these leads remain isolated from other components and the oven
chassis. (Use insulation tape if necessary.) When the
testing is completed carry out 3D checks and reconnect
the leads to the primary of the power transformer.
REMEMBER TO CHECK 4R
1) Reconnect all leads removed from components during
testing.
2) Replace the outer case (cabinet).
3) Reconnect the supply.
4) Run the oven. Check all functions.
Microwave ovens should not be run empty. To test for
the presence of microwave energy within a cavity, place
a cup of cold water on the oven turntable, close the door
and set the microwave timer for two (2) minutes. Set the
power level to HIGH and push the START button. When
the two minutes has elapsed (timer at zero) carefully
check that the water is now hot. If the water remains cold
carry out 3D checks and re-examine the connections to
the component being tested.
When all service work is completed, and the oven is fully assembled, the microwave power output should be checked
and microwave leakage test carried out
SERVICING
When troubleshooting the microwave oven, it is helpful to
follow the Sequence of Operation in performing the
checks. Many of the possible causes of trouble will require
that a specific test be performed. These tests are given a
procedure letter which will be found in the "Test Procedure
"section.
TROUBLESHOOTING GUIDE
IMPORTANT: If the oven becomes inoperative because of
a blown fuse M8A in the upper latch switch
- lower latch switch - monitor switch - monitor resistor circuit, check the upper latch
switch, lower latch switch, monitor switch
and monitor resistor before replacing the
fuse M8A.
Page 13
R-9H56
11
MAGNETRON
POWER TRANSFORMER
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE CAPACITOR
LATCH AND STOP SWITCHES
MONITOR SWITCH
DAMPER SWITCH
MAIN FUSE
TEMPERATURE FUSE 150˚C
THERMAL CUT-OUT
CONVECTION HEATER
THERMISTOR
FAN MOTOR
TURNTABLE MOTOR
CONVECTION MOTOR
DAMPER MOTOR
MONITOR RESISTOR
TOUCH CONTROL PANEL
KEY UNIT
RELAY (RY-1)
RELAY (RY-2)
RELAY (RY-3)
RELAY (RY-4)
RELAY (RY-5)
RELAY (RY-6)
FOIL PATERN ON P.W.B.
AH. SENSOR
OVEN LAMP OR SOCKET
OPENED OR SHORTED WIRE HARNESS
WALL OUTLET
LOW POWER SUPPLY VOLTAGE
SHORTED POWER CORD
Home fuse blows when power
supply cord is plugged into wall
outlet.
Fuse M8A blows when power
cord is plugged into wall outlet.
88:88 does not appear in display
when power cord is first plugged
into wall outlet.
Display does not operate properly when STOP/CLEAR pad is
touched. (The time of day should
appear on the display with beep
sound during normal condition.)
Oven lamp does not light with
door opened.
Oven lamp does not light at all
Oven lamp light, but turntable
motor does not operate.
Cooling fan motor does not oper-
ate.
The oven stops after1 minute
Oven does not go into a cook
cycle, when START pad is
touched.
Low or no power is produced
during microwave cooking (The
food is heated incompletely or
not heated at all)
Extremely uneven heating is produced in oven load (food).
Function of variable cooking does
not operate properly except HIGH
power.
CONV indicator lights, but heating element does not heat.
Temperature in the oven cavity is
lower or higher than preset.
Convection cycle runs 1 minute
then the oven shuts down.
Convection cycle runs 3 minutes
then the oven shuts down.
Oven is in the sensor cooking condition but AH sensor does not end
1st. stage or does not stop cooking
cycle or the oven stops
soon.
CK = Check / RE = Replace
OFF
CONDITION
PROBLEM
TEST PROCEDURE
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
ABCDEEEFGGHI JJJJKLMNNNNNNOPRE CKCK CK RE
CONDITION
COOKING
CONDITION
(MICROWAVE)
(CONVECTION)
(AH. SENSOR)
Page 14
R-9H56
12
TEST PROCEDURES
PROCEDURE
LETTER
CARRY OUT 3D CHECK.
Isolate the magnetron from high voltage circuit by removing all leads connected to filament terminal.
To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron
filament terminals, the meter should show a reading of less than 1 ohm.
To test for short filament to anode condition, connect ohmmeter between one of the filament terminals
and the case of the magnetron (ground). This test should be indicated an infinite resistance. If a low or
zero resistance reading is obtained then the magnetron should be replaced.
MICROWAVE OUTPUT POWER (1 Litre water load)
The following test procedure should be carried out with the microwave oven in a fully assembled
condition (outer case fitted). Microwave output power from the magnetron can be measured by way of
IEC 705, i.e. it can be measured by using water load how much it can be absorbed by the water load.
To measure the microwave output power in the microwave oven, the relation of calorie and watt is used.
When P(W) heating works for t(second), approximately P x t/4.187 calorie is generated. On the other
hand, if the temperature of the water with V(ml) rises ∆T (°C) during this microwave heating period, the
calorie of the water is V x ∆T.
NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL
WHILE THE OVEN IS IN OPERATION.
A MAGNETRON TEST
The formula is as follows;
P x t / 4.187 = V x ∆ T P (W) = 4.187 x V x ∆T / t
Our condition for water load is as follows:
Room temperature..............around 20°C Power supply Voltage.........Rated voltage
Water load.........1000 g Initial temperature...........10±2°C Heating time.........49 sec.
P = 85 x ∆T
COMPONENT TEST
Measuring condition:
1. Container
The water container must be a cylindrical borosilicate glass vessel having a maximum material
thickness of 3 mm and an outside diameter of approximately 190 mm.
2. Temperature of the oven and vessel
The oven and the empty vessel are at ambient temperature prior to the start the test.
3. Temperature of the water
The initial temperature of the water is (10±2)°C.
4. Select the initial and final water temperature so that the maximum difference between the final water
temperature and the ambient temperature is 5°C.
5. Select stirring devices and measuring instruments in order to minimize addition or removal of heat.
6. The graduation of the thermometer must be scaled by 0.1°C at minimum and accurate thermometer.
7. The water load must be (1000±5) g.
8. “t” is measured while the microwave generator is operating at full power. Magnetron filament heatup time is not included.
NOTE: The operation time of the microwave oven is “t + 2” sec. 2 sec. is magnetron filament heat-up time.
Measuring method:
1. Measure the initial temperature of the water before the water is added to the vessel.
(Example: The initial temperature T1 = 11°C)
2. Add the 1 litre water to the vessel.
3. Place the load on the centre of the shelf.
4. Operate the microwave oven at HIGH for the temperature of the water rises by a value ∆ T of
(10 ± 2)°C.
5. Stir the water to equalize temperature throughout the vessel.
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R-9H56
13
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
6. Measure the final water temperature. (Example: The final temperature T2 = 21°C)
7. Calculate the microwave power output P in watts from above formula.
Initial temperature.................................................................................................. T1 = 11°C
Temperature after (49 + 2) = 51 sec...................................................................... T2 = 21°C
Temperature difference Cold-Warm .................................................................... ∆T1 = 10°C
Measured output power
The equation is “P = 85 x ∆T”....................................................... P = 85 x 10°C = 850 Watts
JUDGMENT: The measured output power should be at least ± 15 % of the rated output power.
CAUTION: 1°C CORRESPONDS TO 85 WATTS REPEAT MEASUREMENT IF THE POWER IS
INSUFFICIENT.
1000g
1000g
1000g
T1˚C
T2˚C
Heat up for51 sec.
MICROWAVE OUTPUT POWER (2 Litre water load)
The following test procedure should be carried out with the microwave oven in a fully assembled
condition (with outer case fitted).
Microwave output power from the magnetron can be measured by way of substitution, i.e. it can be
measured by using a water load how much it can be absorbed by the water load. To measure the
microwave output power in the microwave oven, the relation of calorie and watt is used.
On the other hand, if the temperature of the water with V(ml) rises ∆T (˚C) during this microwave heating
period, the calorie of the water is V x ∆T.
The formula is as follows;
P = 8330 x ∆ T / t
Our condition for water load is as follows:
Room temperature..............23±2˚C Power supply Voltage.........240 volts.
Water load.........2000 ml Initial temperature...........23±1˚C Heating time .1 min. 51sec.
P = 75 x ∆T
Measuring method:
A) The two water containers must be prepared.
The water container must be one (1) litre beaker made of Pyrex glass and its diameter approximately
12cm.
B) Put the one (1) litre water into each beaker (Each beaker has one litre water). The initial temperature
of the water should be 23±1˚C.
C) Mark T1 on the one beaker and mark T2 on the other one. And stir the water and measure the
temperature of water the thermometer and note them. The graduation of the thermometer must be
scaled by 0.1˚C at minimum and an accurate mercury thermometer is recommended.
D) Place the two (2) beakers as touching each other in the centre of the oven cavity.
E) Set the timer to 2 minutes and 20 seconds, start the oven at 100% power.
F) The time must be measured with stopwatch or wristwatch.
G) After 1 minutes and 51 seconds, stop the oven by opening the door.
H) Put the two (2) beakers out of the oven cavity and measure the temperature of the water by stirring
the water with thermometer and note them.
Page 16
R-9H56
14
TEST PROCEDURES (CONT'D)
Example
Initial temperature .............................................................................T1 = 23˚C T2 = 24˚C
Temperature after 1 min. 51 sec. ..................................................... T1 = 33˚C T2 = 34˚C
Temperature difference Cold-Warm.............................................. ∆T1 = 10˚C ∆T2 = 10˚C
Mean temperature rise ∆T.........................∆T = (∆T1 ± ∆T2) / 2 = (10˚C+10˚C) / 2 = 10˚C
Measured output power
The equation is P= 75 x ∆T ........................................................ P= 75 x 10˚C = 750 Watts
NOTE: The measured output power should be at least ± 15 % of the rated output power.
CAUTION: 1˚C CORRESPONDS TO 75 WATTS. REPEAT MEASUREMENT IF THE POWER IS
INSUFFICIENT.
COMPONENT TEST
PROCEDURE
LETTER
1 l 1 l
(T1 C) (T2 C)
1 l 1 l
(T1 C) (T2 C)
Heat up for 1min. 51 sec.
B POWER TRANSFORMER TEST
WARNING: High voltages and large currents are present at the secondary winding and filament
winding of the power transformer. It is very dangerous to work near this part when
the oven is on. NEVER make any voltage measurements of the high-voltage circuits,
including the magnetron filament.
CARRY OUT 3D CHECKS.
Disconnect the leads to the primary winding of the power transformer. Disconnect the filament and
secondary winding connections from the rest of the HV circuitry. Using an ohmmeter, set on a low range,
it is possible to check the continuity of all three windings. The following readings should be obtained:
a. Primary winding ................... approx. 1.3 Ω
b. Secondary winding............... approx. 72 Ω
c. Filament winding .................. less than 1Ω
If the reading obtained are not stated as above, then the power transformer is probably faulty and should
be replaced.
CARRY OUT 4R CHECKS.
C HIGH VOLTAGE RECTIFIER ASSEMBLY TEST
HIGH VOLTAGE RECTIFIER TEST
CARRY OUT 3D CHECKS.
Isolate the high voltage rectifier assembly from the HV circuit. The high voltage rectifier can be tested
using an ohmmeter set to its highest range. Connect the ohmmeter across the terminal B+C of the high
voltage rectifier and note the reading obtained. Reverse the meter leads and note this second reading.
The normal resistance is infinite in one direction and more
than 100 kΩ in the other direction.
CARRY OUT 4R CHECKS.
AB
C
D2 D1
ASYMMETRIC
RECTIFIER
HIGH VOLTAGE RECTIFIER
Page 17
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15
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
ASYMMETRIC RECTIFIER TEST
CARRY OUT
3D CHECKS.
Isolate the high voltage rectifier assembly from the HV circuit. The asymmetric can be tested using an
ohmmeter set to its highest range across the terminals A+B of the asymmetric rectifier and note the
reading obtained. Reverse the meter leads and note this second reading. If an open circuit is indicated
in both direction then the asymmetric rectifier is good. If an asymmetric rectifier is shorted in either
direction, then the asymmetric rectifier is probably faulty and must be replaced with high voltage rectifier.
When the asymmetric rectifier is defective, check whether magnetron, high voltage rectifier, high voltage
wire or filament winding of the power transformer is shorted.
CARRY OUT 4R CHECKS.
NOTE: FOR MEASUREMENT OF THE RESISTANCE OF THE RECTIFIER, THE BATTERIES OF THE
MEASURING INSTRUMENT MUST HAVE A VOLTAGE AT LEAST 6 VOLTS, BECAUSE
OTHERWISE AN INFINITE RESISTANCE MIGHT BE SHOWN IN BOTH DIRECTIONS.
D HIGH VOLTAGE CAPACITOR TEST
CARRY OUT 3D CHECKS.
A. Isolate the high voltage capacitor from the circuit.
B. Continuity check must be carried out with measuring instrument which is set to the highest resistance
range.
C. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10MΩ after it has
been charged.
D. A short-circuited capacitor shows continuity all the time.
E. An open capacitor constantly shows a resistance about 10 MΩ because of its internal 10MΩ resistance.
F. When the internal wire is opened in the high voltage capacitor shows an infinite resistance.
G. The resistance across all the terminals and the chassis must be infinite when the capacitor is normal.
If incorrect reading are obtained, the high voltage capacitor must be replaced.
CARRY OUT
4R CHECKS.
E SWITCH TEST
CARRY OUT 3D CHECKS.
Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the
following table.
Table: Terminal Connection of Switch
Plunger Operation COM to NO COM to NC
Released O.C. S.C.
Depressed S.C. O.C.
COM; Common terminal
NO; Normally open terminal
NC; Normally close terminal
S.C.; Short circuit
O.C.; Open circuit
If incorrect readings are obtained, make the necessary switch adjustment or replace the switch.
CARRY OUT
4R CHECKS.
F BLOWN FUSE F M8A
CARRY OUT 3D CHECKS.
1. If the fuse M8A is blown, there could be shorts or grounds in electrical parts or wire harness. Check
them and replace the defective parts or repair the wire harness.
2. If the fuse M8A is blown when the door is opened, check the upper latch switch, lower latch switch,
monitor switch and monitor resistor.
If the fuse M8A is blown by incorrect door switching, replace the defective switch(s) and the fuse M8A.
3. If the fuse M8A is blown, there could be short in the asymmetric rectifier or there is a ground in wire
harness. A short in the asymmetric rectifier may have occured due to short or ground in H.V. rectifier,
magnetron, power transformer or H.V. wire. Check them and replace the defective parts or repair the
wire harness.
CARRY OUT 4R CHECKS.
CAUTION: Only replace fuse with the correct value replacement.
Page 18
R-9H56
16
PROCEDURE
LETTER
COMPONENT TEST
TEST PROCEDURES (CONT'D)
G TEMPERATURE FUSE AND THERMAL CUT-OUT TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the terminals of the temp. fuse or thermal cut-out. Then using an ohmmeter,
make a continuity test across the two terminals as described in the table below.
CARRY OUT 4R CHECKS.
Table: Temperature Fuse and Thermal cut-out Test
Temperature of “ON” condition Temperature of “OFF” condition Indication ofohmmeter
Parts Name (closed circuit) (˚C) (open circuit) (˚C) (When room temperature
is approx. 20˚C)
Temp. fuse 150˚C This is not resetable type. Above 150 ˚C Closed circuit
Thermal cut-out 150˚C Below 130˚C Above 150˚C Closed circuit.
Thermal cut-out 95˚C Below 75˚C Above 95˚C Closed circuit.
If incorrect readings are obtained, replace the temp. fuse or thermal cut-out.;
An open circuit temperature fuse 150˚C (MG) indicates that the magnetron has overheated, this may be
due to resistricted ventilation, cooling fan failure or a fault condition within the magnetron or HV circuit.
An open circuit thermal cut-out 150˚C (OVEN) indicates that the convection motor has over heated, this
may be due to convection motor locked.
An open circuit thermal cut-out 95˚C (FM) indicates that the fan motor winding has overheated, this may
be due to blocked ventilation or locked cooling fan.
CARRY OUT 3D CHECKS.
Before carring out the following tests make sure the heater is fully cool.
1. Resistance of heater
Disconnect the wire leads to the heater to be tested. Using ohmmeter with low resistance range.
Check the resistance across the terminals of the heater.
The resistance of heater is approximately 37.5 ohms.
2. Insulation resistance
Disconnect the wire leads to the heater to be tested. Check the insulation resistance between the
element and cavity using a 500V - 100Mohms insulation tester. The insulation resistance should be
more than 10Mohms in the cold start.
If the results of above test 1 and/or 2 are out of above specifications, the heater is probably faulty and
should be replaced.
CARRY OUT 4R CHECKS.
H CONVECTION HEATER TEST
CARRY OUT 3D CHECKS.
Disconnect connector-E from the CPU unit. Measure the resistance of the thermistor with an ohmmeter.
Connect the ohmmeter leads to Pin No’s E-3 and E-4 of the thermistor harness.
Room Temp. .................. 20˚C - 30˚C
Resistance ..................... Approx. 350kΩ - 155kΩ
If the meter does not indicate above resistance, replace the thermistor.
CARRY OUT 4R CHECKS.
I THERMISTOR TEST
J MOTOR WINDING TEST
CARRY OUT 3D CHECKS.
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17
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
Disconnect the leads from the motor.
Using an ohmmeter, check the resistance between the two terminals as described in the table below.
Table: Resistance of Motor
Motors Resistance
Fan motor Approximately 295 Ω
Turntable motor Approximately 10.5 kΩ
Convection fan motor Approximately 210 Ω
Damper motor Approximately 11 kΩ
If incorrect readings are obtained, replace the motor.
CARRY OUT 4R CHECKS.
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter
and ohmmeter. In this service manual, the touch control panel assembly is divided into two units, Control
Unit and Key Unit and troubleshooting by unit replacement is described according to the symptoms
indicated.
1. Key Unit. Note: Check key unit ribbon connection before replacement.
The following symptoms indicate a defective key unit. Replace the key unit.
a) When touching the pads, a certain pad produces no signal at all.
b) When touching a number pad, two figures or more are displayed.
c) When touching the pads, sometimes a pad produces no signal.
2. Control Unit.
The following symptoms indicate a defective control unit. Replacethe control unit.
2-1 In connection with pads.
a) When touching the pads, a certain group of pads do not produce a signal.
b) When touching the pads, no pads produce a signal.
2-2 In connection with indicators.
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light up; or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
2-3 Other possible troubles caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
d) Proper temperature measurement is not obtained.
L TOUCH CONTROL PANEL ASSEMBLY TEST
K MONITOR RESISTOR TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the monitor resist. Using an ohmmeter and set on a low range. Check between
the terminals of the monitor resistor.
The resistance of monitor resistor is approx. 0.8 ohms.
If incorrect readings are obtained, replace the monitor resistor.
CARRY OUT 4R CHECKS.
Page 20
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18
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
M KEY UNIT TEST
If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon is making
good contact, verify that the door sensing switch (stop switch) operates properly; that is the contacts are
closed when the door is closed and open when the door is open.
If the door sensing switch (stop switch) is good, disconnect the flat ribbon that connects the key unit to
the control unit and make sure the door sensing switch is closed (either close the door or short the door
sensing switch connector). Use the key unit matrix indicated on the control panel schematic and place
a jumper wire between the pins that correspond to the STOP/CLEAR pad making momentary contact.
If the control unit responds by
clearing with a beep the key unit
is faulty and must be replaced. If
the control unit does not respond,
it is faulty and must be replaced.
If a specific pad does not respond, the above method may
be used (after clearing the control unit) to determine if the control unit or key pad is at fault.
G-11
G-12
G-3
G-4
G-5
G-6
G-7
G-8
G-9
G-10
G-2
G-1
KEY UNIT
1
2
3
4
5
67
890
STOP
CLEAR
AUTO START
Reheat
Pie
EASY
DEFROST
LESS
POWER
LEVEL
40˚C
70˚C
130˚C
150˚C
160˚C
180˚C
200˚C
220˚C 230˚C
250˚C
CLOCK
HIGH MIXLOW MIXCONVEC
GRILL
REHEAT
SENSOR
MULTI
COOK
Frozen
Vegetables
Desserts
Fresh
Vegetables
Jacket
Potato
INSTANT COOK
START
MORE
Casseroles
N RELAY TEST
emove the outer case and check voltage between Pin Nos. 7 and 9 of the 9-pin connector (A) on the
control unit with an A.C. voltmeter. The meter should indicate 240 volts, if not check oven circuit.
Shut-off, Cook and Heater Relay Test
These relays are operated by D.C. voltage.
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation or
convection cooking operation.
DC. voltage indicated ...............Defective relay.
DC. voltage not indicated .........Check diode which is connected to the relay coil. If diode is good,
control unit is defective.
RELAY SYMBOL
OPERATIONAL
VOLTAGE
CONNECTED COMPONENTS
RY1 Approx. 19.0 V.D.C. Oven lamp/Turntable motor
RY2(COOK) Approx. 18.0 V.D.C. Power transformer
RY3(HEATER) Approx. 18.0 V.D.C. Heating element
RY4 Approx. 19.0 V.D.C. Damper motor
RY5 Approx. 19.0V.D.C. Convection motor
RY6 Approx. 19.0 V.D.C. Cooling fan motor
O PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
(PWB) IS OPEN.
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on
the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given
below for repair.
STEPS OCCURANCE CAUSE OR CORRECTION
1 The rated voltage is not applied to POWER
terminal of CPU connector (CN-A)
Check supply voltage and oven power cord.
2 The rated voltage is applied to primary side of
power transformer.
Power transformer or secondary circuit defective. Check
and repair.
3 Only pattern at "a" is broken. *Insert jumper wire J1 and solder.
4 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".
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R-9H56
19
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
RY4
13
(J1)
31
CN-A
M
1
357 9
DAMP
M
CONV M
FAN
POWER
P
S1 S2
T1
b
a
c
VRS1
d
Problem: POWER ON, indicator does not
light up.
NOTE: *At the time of making these repairs,
make a visual inspection of the
varistor. check for burned damage
and examine the transformer with an
ohmmeter for the presence of layer
short-circuit (check primary coil
resistance). If any abnormal condition
is detected, replace the defective
parts.
P AH SENSOR TEST
Checking the initial sensor cooking condition
(1) The oven should be plugged in at least five minutes before sensor cooking.
(2) Room temperature should not exceed 35˚C.
(3) The unit should not be installed in any area where heat and steam are generated. The unit should
not be installed, for example, next to a conventional surface unit. Refer to the "INSTALLATION
Instructions" .
(4) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To
permit adequate ventilation, be sure to install so as not to block these vents. There should be some
space for air circulation.
(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture
with a dry cloth or paper towel.
(6) The Sensor works with food at normal storage temperature.For example, chicken pieces would be
at refrigerator temperature and canned soup at room temperature.
(7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The
sensor will detect the vapor given of by the spray and turn off before food is properly cooked.
(8) After the oven is started on sensor cooking condition, if the sensor has not detected the vapor of the
food, ERROR will appear and the oven will shut off.
Water load cooking test
Make sure the oven has been plugged in at least five minutes before checking sensor cook operation.
The cabinet should be installed and screws tightened.
(1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
(2) Place the container on the center of tray in the oven cavity.
(3) Close the door.
(4) Touch REHEAT SENSOR pad twice. Now, the oven is in the sensor cooking condition and "MENU2"
will appear in the display.
(5) The oven will operate for the first 16 seconds, without generating microwave energy.
When the AH sensor is defective (open or short), ERROR will appear in the display after 16 seconds
cleaning time.
If ERROR appears check sensor wire connections and/or AH sensor.
NOTE: ERROR will appear if the door is opend or STOP/CLEAR pad is touched during first stage of
sensor cooking.
(6) After approximately 16 seconds, microwave energy is produced, oven should turn off after water is
boiling (bubling).
If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below.
TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT
To determine if the sensor is defective, the simplest method is to replace it with a new replacement
sensor.
(1) Disconnect oven from power supply and remove outer case.
(2) Discharge the high voltage capacitor.
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R-9H56
20
(3) Remove the AH sensor.
(4) Install the new AH sensor.
(5) Re-install the outer case.
(6) Reconnect the oven to the power supply and check the sensor cook operation, proceed as follows:
6-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
6-2. Place the container on the center of tray in the oven cavity.
6-3. Close the door.
6-4. Touch REHEAT SENSOR pad twice.
6-5. The control panel is in automatic Sensor operation.
6-6. The oven will turn off automatically after the water is boiling (bubling).
If new sensor dose not operate properly, the problem is with the control unit.
CHECKING CONTROL UNIT
(1) Disconnect oven from power supply and remove outer case.
(2) Discharge the high voltage capacitor.
(3) Disconnect the wire leads from the cook relay.
(4) Disconnect the sensor connector that is mounted to lower portion of control panel.
(5) Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
(6) Reconnect the oven to the power supply and check the sensor cook operation, proceed as follows:
6-1. Touch REHEAT SENSOR pad twice.
6-2. The control panel is in the sensor cooking operation.
6-3. After approximately 20 seconds, push plunger of select switch. This condition is same as
judgement by AH sensor.
6-4. After approximately 3 seconds, cooking operation turns off, an audible signal will sound,
and the display will then revert to the time of day.
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective.
R1,R2 : 100Ω ± 1% 1/2W
R3 : 10kΩ ± 5% 1/4W
R4 : 3kΩ ± 5% 1/4W
TEST PROCEDURES (CONT'D)
PROCEDURE
LETTER
COMPONENT TEST
Plunger
NC
NO
COM
COM
NO
NC
R3 R4
R1
R2
1
2
3
F-1
F-2
F-3
To connector (F)
on Control Unit.
CONNECTOR
Sensor Dummy Resistor Circuit
Page 23
R-9H56
21
4) ACL Circuit
A circuit to generate a signals which resetting the LSI to
the initial state when power is applied.
5) Buzzer Circuit
The buzzer is responds to signals from the LSI to emit
noticing sounds (key touch sound and completion sound).
6) Temperature Measurement Circuit: Oven
The temperature in the oven cavity is sensed by the
thermistor. The variation of resistance according to
sensed temperature is detected by the temperature
measurement circuit and the result applied to LSI. The
LSI uses this information to control the relay and display
units.
7) Absolute Humidity Sensor Circuit
This circuit detects the humidity of a food which is being
cooked, to control its automatic cooking.
8) Door Sensing Switch
A switch to inform the LSI if the door is open or closed.
9) Relay Circuit
To drive the magnetron, heating element, fan motor,
convection motor, damper motor, turntable motor and
light the oven lamp.
10) Indicator Circuit
Indicator element is a Fluorescent Display.
Basically, a Fluorescent Display is triode having a
cathode, a grid and an anode. Usually, the cathode of a
Fluorescent Display is directly heated and the filament
serves as cathode.
The Fluorescent Display has 6-digits, 15-segments are
used for displaying figures.
The touch control section consists of the following units
as shown in the touch control panel circuit.
(1) Key Unit
(2) Control Unit
The principal functions of these units and the signals communicated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through P03, P05, P11, P12,
P15, P16, P20 and P23. When a key pad is touched, a signal
is completed through the key unit and passed back to the
LSI through R24-R27 to perform the function that was
requested.
Control Unit
Control unit consists of LSI, power source circuit, synchronizing signal circuit, ACL circuit, buzzer circuit, temperature
measurement circuit, absolute humidity sensor circuit and
indicator circuit.
1) LSI
This LSI controls the temperature measurement signal,
AH sensor signal, key strobe signal, relay driving signal
for oven function and indicator signal.
2) Power Source Circuit
This circuit generates the voltage necessary for the
control unit from the AC line voltage.
3) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit. It incorporates a very small error because it works
on commercial frequency.
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
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22
1 VCC IN Connected to GND.
2 VEE IN Anode (segment) of Fluorescent Display light-up voltage: -28V.
Vp voltage of power source circuit input.
3 AVSS IN Power source voltage: -5V.
VC voltage of power source circuit input.
4 VREF IN Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V)
5 AN7 IN Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is
an analog input terminal from the AH sensor circuit, and connected to the A/D coverter
built into the LSI.
6 AN6 IN AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the
A/D converter built into the LSI.
7-9 AN5-AN3 IN Heating constant compensation terminal.
10 AN2 IN Input signal which communicates the damper open/close information to LSI.
Damper opened; "H" level signal(0V:GND).
Damper closed; "L" level signal(-5V).
11 AN1 IN Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal(0V).
Door opened; "L" level signal(-5V).
12 AN0 IN Temperature measurement input: OVEN THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
13 P55 OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook
relay(RY2). In HIGH operation, the
signals holds "L" level during micro-
wave cooking and "H" level while
not cooking. In other cooking modes
(MED HIGH, MED, MED LOW,
LOW) the signal turns to "H" level
and "L" level in repetition according
to the power level.
14 P54 OUT Heating element driving signal.
To turn on and off shut-off relay(RY3). "L" level during
convection cooking; "H" level otherwise. During con-
vection cooking, the signal becomes "H" level when the
temperature of the oven cavity exceeds the predeter-
mined temperature.
15 P53 OUT Cooling fan motor driving signal.
To turn on and off shut-off relay(RY6). "L" level
during both microwave and convection cooking;
"H" level otherwise.
16 P52 OUT Convection motor driving signal.
To turn on and off shut-off relay(RY5). "L" level
during CONVECTION; "H" level otherwise.
17 P51 OUT Damper motor relay driving signal.
To turn on and off shut-off relay(RY4).
18 P50 OUT Terminal not used.
19 P47 OUT Oven lamp and turntable motor driving signal. (Square Waveform : 50Hz)
To turn on and off the shut-off relay(RY1).
DESCRIPTION OF LSI
LSI(IZA589DR):
The I/O signals of the LSI(IZA589DR) are detailed in the following table.
Pin No. Signal I/O Description
VARI MODE ON TIME OFF TIME
HIGH (100% power) 32 sec. 0 sec.
MED HIGH (approx. 70% power) 24 sec. 8 sec.
MED (approx. 50% power) 18 sec. 14sec.
MED LOW (approx. 30% power) 12 sec. 20 sec.
LOW (approx. 10% power) 6 sec. 26 sec.
ON
OFF
During
cooking
L
GND
H.
(Convection)
ON
OFF
During
cooking
L
GND
H.
ON
OFF
During
cooking
L
GND
H.
(Convection)
ON
OFF
H : GND
L
Page 25
R-9H56
23
The square waveform voltage is delivered
to the relay(RY1) driving circuit and
relays(RY2,RY3,RY5) control circuit.
20-21 P46-P45 OUT Terminal not used.
22 P44 OUT Timing signal output terminal for temperature measurement(OVEN).
"H" level (GND) : Ttermistor OPEN timing.
"L" level (-5V) : Temperature measuring timing.(Convection cooking)
23 P43 OUT Signal to sound buzzer.
A: key touch sound.
B: Completion sound.
C: When the temperature of the oven cav-
ity reaches the preset temperature in
the preheating mode, or when the
preheating hold time (30 minutes) is
elapsed.
24 P42 OUT Timing signal output terminal for temperature measurement(OVEN).
"H" level (GND) : Ttermistor OPEN timing.
"L" level (-5V) : Temperature measuring timing.(Convection cooking)
25 P41 IN Signal to synchronize LSI with commercial power source freqency.
This is the basic timing for all real time
processing of LSI.
26 P40 IN Connected to GND.
27 RST IN Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily
set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter
set at "H" level.
28/29 XCIN/XCOUT OUT Terminal not used.
30 XIN IN Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
31 XOUT OUT Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
32 VSS IN Power source voltage: -5V.
VC voltage of power source circuit input.
33 P27 IN Signal coming from touch key.
When any one of G-1 line keys on key matrix is touched, a corresponding signal from
P03,P05,P11,P12,P15,P16,P20 and P23 will be input into P27. When no key is
touched, the signal is held at "L" level.
34 P26 IN Signal similar to P27.
When any one of G-2 line key on key matrix is touched, a corresponding signal will be
input into P26.
35 P25 IN Signal similar to P27.
When any one of G-3 line key on key matrix is touched, a corresponding signal will be
input into P25.
36 P24 IN Signal similar to P27.
When any one of G-4 line key on key matrix is touched, a corresponding signal will be
input into P24.
37 P23 OUT Segment data signals.
The relation between signals and indicators are as follows:
Signal Segment Signal Segment Signal Segment Signal Segment
P35 .................. P1 P03................... P5 P12 ................... P8 P20................. P13
P36 .................. P2 P04................... P6 P13 ................... P9 P21................. P14
P00 .................. P3 P05................... P7 P15 ................. P10 P23................. P15
P01 .................. P4 P11................. P12 P16 ................. P11
Pin No. Signal I/O Description
During cooking
L
H
20 msec.
A
B
C
H: GND
L
0.1 sec
2 sec
1 sec
1 sec
H : GND
L (-5V)
20 msec
Page 26
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24
Pin No. Signal I/O Description
Key strobe signal.
Signal applied to touch-key section. A pulse
signal is input to P24-P27 terminal while one of
G-5 line keys on key matrix is touched.
38 P22 OUT Digit selection signal.
The relationship between digit signal and digit are as follows;
Digit signal Digit
P22 ........................... 1st.
P17 ..........................2nd.
P14 .......................... 3rd.
P06 ...........................4th.
P02 ...........................5th.
P37 .......................... 6th.
Normally, one pulse is output in every ß
period, and input to the grid of the Fluorescent Display.
39 P21 OUT Segment data signal. Signal similar to P23.
40 P20 OUT Segment data signal. Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while
one of G-6 line keys on key matrix is touched.
41 P17 OUT Digit selection signal. Signal similar to P22.
42 P16 OUT Segment data signal. Signal similar to P23.
Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while
one of G-7 line keys on key matrix is touched.
43 P15 OUT Segment data signal.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while
one of G-8 line keys on key matrix is touched.
44 P14 OUT Digit selection signal. Signal similar to P22.
45 P13 OUT Segment data signal. Signal similar to P23.
46 P12 OUT Segment data signal. Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while
one of G-9 line keys on key matrix is touched.
47 P11 OUT Segment data signal. Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while
one of G-10 line keys on key matrix is touched.
48/49 P10/P07 OUT Terminal not used.
50 P06 OUT Digit selection signal. Signal similar to P22.
51 P05 OUT Segment data signal. Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while
one of G-11 line keys on key matrix is touched.
52 P04 OUT Segment data signal. Signal similar to P23.
ß(50Hz)
GND
VP
P22
ß(50Hz)
H
L
GND
VP
P17
P14
P06
P02
P37
Page 27
R-9H56
25
Pin No. Signal I/O Description
53 P03 OUT Segment data signal. Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while
one of G-12 line keys on key matrix is touched.
54 P02 OUT Digit selection signal. Signal similar to P22.
55-56 P01-P00 OUT Segment data signal. Signal similar to P23.
57 P37 OUT Digit selection signal. Signal similar to P22.
58-59 P36-P35 OUT Segment data signal. Signal similar to P23.
60-64 P34-P30 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).
SW1
SW2
SW3
SW4
SW5
P30
P31
P32
P33
P34
LSI
(IC1)
AN7
AN6
620k
300k
150k
75k
37.4k
4
64
5
63
6
7
8
62
61
60
3
5
2
6
47k
47k
10k
0.01uF
0.015uF
0.01uF
360k
+
-
1
12
VA : -15V
VA : -15V
R51
9
S
F-2
10
1.8k
F-1
F-3
C
11
3.57k
3.32k
VC : -5V
0.1
uF
C. Thermistor in
closed vesssl
S. Thermistor in
open vessel
IC2(IZA495DR)
C
S
R3
R1
R2
+
-
Operational
amplifier
Output
voltage
S : Thermistor
open vessel
C : Thermistor
closed vessel
2
Absolute humidity (g/m )
Output voltage
Absolute humidity vs,
output voltage characterist
LSI are turned on in such a way as to change the
resistance values in parallel with R50-1. Changing the
resistance values results in that there is the same
potential at both F-3 terminal of the absolute humidity
sensor and AN7 terminal of the LSI. The voltage of AN6
terminal will indicate about -2.5V. This initial balancing
is set up about 16 seconds after the unit is put in the
Sensor Cooking mode. As the sensor cooking proceeds,
the food is heated to generate moisture by which the
resistance balance of the bridge circuit is deviated to
increase the voltage available at AN6 terminal of the LSI.
Then the LSI observes that voltage at AN6 terminal and
compares it with its initial value, and when the comparison
rate reaches the preset value (fixed for each menu to be
cooked), the LSI causes the unit to stop sensor cooking;
thereafter, the unit goes in the next operation
automatically.
When the LSI starts to detect the initial voltage at AN6
terminal 16 seconds after the unit has been put in the
Sensor Cooking mode, if it is not possible to balance, of
the bridge circuit due to disconnection of the absolute
humidity sensor, ERROR will appear on the display and
the cooking is stopped.
1) Absolute humidity sensor circuit
(1) Structure of Absolute Humidity Sensor
The absolute humidity sensor includes two thermistors
as shown in the illustration. One thermistor is housed in
the closed vessel filled with dry air while another in the
open vessel. Each sensor is provided with the protective
cover made of metal mesh to be protected from the
external airflow.
(2) Operational Principle of Absolute Humidity Sensor
The figure below shows the basic structure of an absolute
humidity sensor. A bridge circuit is formed by two
thermistors and two resistors (R1 and R2).
The output of the bridge circuit is to be amplified by the
operational amplifier.
Each thermistor is supplied with a current to keep it
heated at about 150˚C, the resultant heat is dissipated in
the air and if the two thermistors are placed in different
humidity conditions they show different degrees of heat
conductivity leading to a potential difference between
them causing an output voltage from the bridge circuit,
the intensity of which is increased as the absolute
humidity of the air increases. Since the output is very
minute, it is amplified by the operational amplifier.
(3) Detector Circuit of Absolute Humidity Sensor Circuit
This detector circuit is used to detect the output voltage
of the absolute humidity circuit to allow the LSI to control
sensor cooking of the unit. When the unit is set in the
sensor cooking mode, 16 seconds clearing cycle occurs
than the detector circuit starts to function and the LSI
observes the initial voltage available at its AN6 terminal.
With this voltage given, the switches SW1 to SW5 in the
ABSOLUTE HUMIDITY SENSOR CIRCUIT
Sensing part
(Open vessel)
Sensing part
(Closed vessel)
Page 28
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26
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the
circuits. When handling these parts, the following
precautions should be strictly followed. CMOS LSI have
extremely high impedance at its input and output
terminals. For this reason, it is easily influenced by the
surrounding high voltage power source, static electricity
charge in clothes, etc., and sometimes it is not fully
protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap them in
aluminium foil. Also wrap all PW boards containing them
in aluminium foil.
2) When soldering, ground the technician as shown in the
figure and use grounded soldering iron and work table.
2. Shapes of Electronic Components
3. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the
precautions you must take when doing so. To perform
the servicing, power to the touch control panel is available
either from the power line of the oven itself or from an
external power source.
(1)Servicing the touch control panel with power supply
of the oven:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING PRESENTS A HAZARD.
Therefore, when checking the performance of the touch
control panel, put the outer cabinet on the oven to avoid
touching the high voltage transformer, or unplug the
primary terminal (connector) of the high voltage
transformer to turn it off; the end of such connector must
be insulated with an insulating tape. After servicing, be
sure to replace the leads to their original locations.
A. On some models, the power supply cord between the
touch control panel and the oven itself is so short that the
two can't be separated.
SERVICING
For those models, check and repair all the controls
(sensor-related ones included) of the touch control panel
while keeping it connected to the oven.
B. On some models, the power supply cord between the
touch control panel and the oven proper is long enough
that they may be separated from each other. For those
models, therefore, it is possible to check and repair the
controls of the touch control panel while keeping it apart
from the oven proper; in this case you must short both
ends of the door sensing switch (on PWB) of the touch
control panel with a jumper, which brings about an
operational state that is equivalent to the oven door
being closed. As for the sensor-related controls of the
touch control panel, checking them is possible if dummy
resistor(s) with resistance equal to that of the controls
are used.
(2) Servicing the touch control panel with power supply
from an external power source:
Disconnect the touch control panel completely from the
oven proper, and short both ends of the door sensing
switch (on PWB) of the touch control panel, which brings
about an operational state that is equivalent to the oven
door being closed. Connect an external power source to
the power input terminal of the touch control panel, then
it is possible to check and repair the controls of the touch
control panel it is also possible to check the sensorrelated controls of the touch control panel by using the
dummy resistor(s).
4. Servicing Tools
Tools required to service the touch control panel
assembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a grounding
terminal.)
2) Oscilloscope: Single beam, frequency range: DC - 10MHz
type or more advanced model.
3) Others: Hand tools
5. Other Precautions
1) Before turning on the power source of the control unit,
remove the aluminium foil applied for preventing static
electricity.
2) Connect the connector of the key unit to the control unit
being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that abnormal
voltage due to static electricity etc. is not applied to the
input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to PWB,
making sure that all connections are tight.
5) Be sure to use specified components where high precision
is required.
approx. 1M ohm
E
C
B
E
C
B
E
C
B
Transistor
2SB793
Transistor
DTD143EA
Transistor
DTA114YS
DTA143ES
DTB143ES
Page 29
R-9H56
27
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal or damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
1. Disconnect the oven from power supply.
2. Make sure that a definite” click” can be heard when the
microwave oven door is unlatched. (Hold the door in a
closed position with one hand, then push the door open
button with the other, this causes the latch leads to rise,
it is then possible to hear a “click’ as the door switches
operate.)
3. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
Please refer to ‘OVEN PARTS, CABINET PARTS, DOOR PARTS’, when carrying out any of the following removal
procedures:
OUTER CASE REMOVAL
To remove the outer case, proceed as follows.
1. Disconnect the oven from power supply.
2. Open the oven door and wedge it open.
3. Remove the screws from rear and along the side edge of
case.
4. Slide the entire case back about 1 inch (3cm) to free it
from retaining clips on the cavity face plate.
5. Lift the entire case from the oven.
6. Discharge the H.V. capacitor before carring out any
further work.
7. Do not operate the oven with the outer case removed.
N.B.; Step1, 2 and 6 from the basis of the 3D checks.
CAUTION: DISCHARGE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.
REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from power transformer.
3. Disconnect the filament leads of the power transformer
from the megnetron and high voltage capacitor.
4. Disconnect the high voltage leads of capacitor from the
transformer.
5. Remove the two (2) screws and one (1) washer holding
the transformer to the base cabinet.
6. Remove the transformer.
RE-INSTALL
1. Rest the transformer on the base cabinet with its primary
terminals toward rear cabinet.
2. Insert the two edges of the transformer into two metal
tabs of the base cabinet.
POWER TRANSFORMER REPLACEMENT
3. Make sure the transformer is mounted correctly to the
corners underneath those tabs.
4. After re-installing the transformer, secure the transformer
with two screws to the bace cabint, one is with outertooth
washer and the other is without outer-tooth washer.
5. Re-connect the wire leads (primary and high voltage)
and high voltage lead to the transformer and filament
leads of transformer to the magnetron and capacitor,
referring to the “Pictorial Diagram”.
6. Re-install the outer case and check that the oven is
operating properly.
NOTE: LIVE(ORANGE) WIRE MUST BE CONNECTED
TO THE CABINET-SIDE OF THE POWER
TRANSFORMER.
1. CARRY OUT 3D CHECKS
2. Disconnect filament lead of transfomer and high voltage
wire lead from magnetron.
3. Take off three (3) screws secured the chassis support to
oven cavity and waveguide.
4. Remove the cooling fan assembly refer to “Cooling Fan
Removal”
5. Carefully remove four (4) mounting screws holding the
magnetron and magnetron air guide to waveguide. When
removing the screws hold the magnetron and magnetron
air guide to prevent it from falling.
6. Remove the magnetron from the waveguide with care so
the magnetron antenna should not hit by any metal
object around the antenna
CAUTION: WHEN REPLACING THE MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND
THE MAGNETRON MOUNTING SCREWS
ARE TIGHTENED SECURELY.
MAGNETRON REMOVAL
Page 30
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28
ASYMMETRIC RECTIFIER AND HIGH VOLTAGE RECTIFIER REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove one (1) screw holding the high voltage rectifier
terminal to the capacitor holder.
3. Disconnect the high voltage rectifier assembly from the
capacitor.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-
FIER ASSEMBLY, ENSURE THAT THE
EARTHING SIDE TERMINAL MUST BE SECURED FIRMLY WITH AN EARTHING
SCREW.
HIGH VOLTAGE CAPACITOR REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the high voltage wire leads and rectifier
assembly from the high voltage capacitor and magnetron.
3. Disconnect filament lead of transfomer from high voltage
capacitor.
4. Disconnect high voltage wire leads of capacitor from
transformer.
5. Remove one (1) screw and washer holding the high
voltage rectifier from the capacitor holder.
6. Remove one (1) screw holding capacitor holder to rear
cabinet.
7. Remove the high voltage capacitor from the holder.
1. CARRY OUT 3D CHECKS.
2. Pull the wire leads from the oven lamp socketby pushing
the terminal hole of the oven lamp socket withthe flat type
small screw driver.
3. Lift up the tab of oven lamp mounting plate holding the
oven lamp socket.
4. Slide the oven lamp socket left-ward.
5. Now, the oven lamp socket is free.
CAUTION: WHEN REPLACING THE OVEN LAMP
SOCKET, REPLACE IT SO THAT THE SIDE
WHERE THE BLACK DOT IS PUT FACES
UPWARD.
OVEN LAMP SOCKET REMOVAL
HEATER UNIT ASSEMBLY REMOVAL (HEATING ELEMENT/THERMISTOR)
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from oven thermal cut-out,
convection motor, thermistor and heater element.
Remove convection motor ass’y refer to “Convection
Motor Removal No.3 to No.5”.
3. Remove eleven (11) screws holding heater duct to the
oven cavity.
4. Release two (2) snap bands holding wire harness to the
thermal protection plate (left).
5. The heater unit is now free.
HEATING ELEMENT AND THERMISTOR
1. Remove two (2) screws holding heating element to
heater duct.
2. Loosen two (2) screws holding holders to heater duct
and take heating element out of heating element holders.
3. Heating element is free.
4. Remove two (2) screws holding thermistor to heater
duct.
5. Thermistor is free.
Oven lamp
socket
Terminal
Wire lead
Flat type small
screw driver
Terminal hole
CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL
To remove the control panel, proceed as follows:
1. CARRY OUT 3D CHECKS
2. Disconnect connector CN-A, CN-E, CN-B, CN-F, TAB1,
TAB2 and TAB3 from the control unit.
3 Remove one (1) screw holding the control panel back
plate to the chassis support.
4. Remove the one (1) screw holding the bottom edge of
the back plate to the cabinet base.
5. Remove two (2) screws holding the back plate to the
oven cavity flange.
6. Lift up and pull the control panel forward.
Replacement of individual component is as follows:
CONTROL UNIT AND KEY UNIT
1. Disconnect the wire connector from the control unit.
2. Remove the four (4) screws holding the panel frame to
the back plate.
3. Separate the panel frame and back plate.
4. Remove the three (3) screws holding the control unit to
the panel frame.
5. Lift up the control unit and disconnect the key connector
from the control unit.
6. Now, the control unit and frame assembly are separated.
NOTE: 1. Before attaching a new key unit, remove remaining
adhesive on the control panel frame surfaces
completely with alcohol and so on.
2. When attaching the key unit to the control panel
frame, adjust the lower edge and right edge of the
key unit to the correct position of control panel
frame.
3. Stick the key unit firmly to the control panel frame
by rubbing with soft cloth not to scratch.
Black dot
Page 31
R-9H56
29
TURNTABLE MOTOR AND/OR COUPLING REMOVAL
1. Disconnect the oven from power supply.
2.
Remove one (1) screw holding the turntable motor cover
to the base cabinet and take off the turntable motor cover.
3. Disconnect wire lead from the turntable motor.
4. Remove the two (2) screws holding the turntable motor
to the mounting plate of the oven cavity bottom.
5. Pull the turntable coupling out of the oven cavity.
6. Turntable coupling and motor will be free.
CONVECTION MOTOR REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from the convection motor.
Remove the convection fan belt and pulley(M).
3. Remove two (2) screws holding the convection motor
mounting angle to the heater duct and base cabinet.
REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the wire leads from the fan motor and thermal
cut-out.
3. Remove the three (3) screws holding the chassis support
to rear cabinet, control panel back plate and waveguide.
4 Remove one (1) tab holding the fan duct to air guide .
5. Remove the fan motor assembly from the oven cavity.
6. Remove the fan blade assembly from the fan motor shaft
according the following procedure.
1) Hold the edge of the rotor of the fan motor by using a pair
of grove joint pliers.
CAUTION:
* Make sure that any pieces do not enter the gap
between the rotor and the stator of the fan motor.
Because the rotor is easy to be shaven by pliers and
metal pieces may be produced.
* Do not touch the pliers to the coil of the fan motor
because the coil may be cut or injured.
* Do not transform the bracket by touching with the
pliers.
2) Remove the fan blade assembly from the shaft of the fan
motor by pulling fan retainer clip and rotating the fan
blade with your hand.
3) Now, the fan blade will be free.
CAUTION:
* Do not use this removed fan blade again.Because
the hole(for shaft) of it may become bigger than a
standard one.
7. Remove the two (2) screws and nuts holding the fan
motor and thermal cut-out mounting angle from the fun
duct.
8. Now, the fan motor is free.
4. Take out the convection motor assembly from the unit.
The convection motor assembly is now free.
5. Remove two (2) screws and nuts holding the motor to
mounting angle.
6. Convection motor is now free.
DAMPER ASSEMBLY REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove cooling fan motor and magnetron refer to
“Cooling Fan Motor Removal” and “Magnetrom Removal”.
3. Disconnect wire leads from damper motor and damper
switch.
4. Remove two(2) ovenside screws holding damper motor
angle to thermal protection plate (right).
5. Damper assembly is free.
6. Remove one (1) screw holding damper motor to damper
motor angle and one (1) screw holding damper switch to
damper motor angle.
7. Damper motor and switch are free.
FAN MOTOR REPLACEMENT
Rear view
Coil
Gap
Rotor
Bracket
Stator
Groove joint pliers
Shaft
Axis
Stator
These are the position
where should be
pinched with pliers
Rotor
Side view
INSTALLATION
1. Install the fan motor and thermal cut-out angle to the fan
duct with the two (2) screws and nuts.
2. Install the fan blade assembly to the fan motor shaft
according the following procedure.
1) Hold the center of the bracket which supports the shaft
of the fan motor on the flat table.
2) Apply the screw lock tight into the hole(for shaft) of the
fan blade.
3) Install the fan blade assemby to the shaft of fan motor by
pushing the fan blade with a small, light weight, ball peen
hammer or rubber mallet.
Page 32
R-9H56
30
CAUTION:
* Do not hit the fan blade strongly when installed
because the bracket may be transformed.
* Make sure that the fan blade rotates smooth after
installed.
* Make sure that the axis of the shaft is not slanted.
3. Install the fan duct to the air guide.
4. Install the chassis support to the oven cavity with three
(3) screws.
Shaft
Table
Center of
bracket
5. Connect the wire leads to the fan motor and the thermal
cut-out, referring to the pictorial diagram.
Refer to chapter “Test Procedure” and Adjustment procedure.
STOP SWITCH, UPPER LATCH SWITCH, LOWER LATCH SWITCH AND MONITOR SWITCH A
DJUSTMENT
If those switches do not operate properly due to a
misadjustment, the following adjustment should be made.
1. Loosen the two (2) screws holding the latch hook to the
flange on the oven front face.
2. With the door closed, adjust the latch hook by moving it
back and forth and then adjust the latch hook by moving
it back and forth. In and out play of the door allowed by
the latch hook should be less than 0.5 mm.
3. Secure the screws with washers firmly.
4. Now, make sure of the upper and lower latch switches
operations. If these latch switches are not activated with
the door closed, loose the screws holding the latch hook
to the oven cavity front flange and adjust the latch hook
position.
After the adjustment, make sure of the following:
1. The in and out play of the door remains less than 0.5 mm
at latched position.
2. The upper and lower latch switches interrupt the circuit
before the door can be opened.
3. The monitor switch contacts close when the door is
opened.
4. Re-install the outer case and check for microwave leakage
around the door with an approved microwave survey
meter. (Refer to Microwave Measurement Procedure.)
LATCH HOOK
STOP SWITCH
MONITOR SWITCH
UPPER LATCH
SWITCH
LOWER LATCH
SWITCH
LATCH
HEAD
LATCH
HEAD
Figure C-1. Latch Switches Adjustment
STOP SWITCH, UPPER LATCH SWITCH, LOWER LATCH SWITCH AND MONITOR SWITCH
REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove control panel assembly, refer to “Control Panel
Removal”.
3. Discharge high voltage capacitor.
4. Disconnect wire leads from each of the switches.
5. Remove two (2) screws holding latch hook to oven
flange.
6. Remove latch hook assembly from oven flange.
7. Push downward on the one (1) stopper tabs holding each
of the switches place.
8. Switches are free.
At this time latch lever will be free, do not lose it.
Re-install
1. Re-install latch lever and each switch in its place, refer to
Figure C-1.
2. Re-connect the wire leads to each switches and fuse
holder.
Refer to the pictorial diagram.
3. Secure the latch hook (with two (2) mounting screws) to
the oven flange.
4. Make sure that monitor switch is operating properly.
CORD HOLDER REMOVAL
1. Remove the one (1) special screw holding the cord
holder to the rear cabinet, using the special driver
LHSTIX DLR4-100T.
2. Now, the cord holder is free.
NOTE: When securing or loosening the special screw,
LHSTIX DLR4-100T type screw driver should be
used.
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31
DOOR DISASSEMBLY
Remove door assembly, refer to “Door Replacement”.
Replacement of door components are as follows:
1. Place door assembly on a soft cloth with latches facing
up.
Note: As the engaging part of choke cover and door panel
are provided at several places, do not force any
particular part.
2. Insert an putty knife (thickness of about 0.5mm) into the
gap between the choke cover and corner portion of door
panel as shown figure C-2 to free engaging parts.
3. Lift up choke cover.
4. Now choke cover is free from door panel.
CHOKE COVER
PUTTY KNIFE
FRONT
INSIDE
Upper
Lower
Bent
Door
Panel
Choke
cover
1 BENT
2 LIFT UP
Figure C-2. Door Disassembly
DOOR REPLACEMENT
1. Disconnect oven from power supply and remove outer
case.
Remove turntable tray and roller stay from oven cavity.
2. Remove three (3) screws holding lower oven hinge.
3. Remove lower oven hinge from oven cavity bottom
flange.
4. Remove door assembly from upper oven hinge on the
oven.
5. Door assembly is now free.
Note: When individual parts are replaced, refer to “Door
Disassembly”.
6. On re-installing door, insert the upper oven hinge into the
door hinge pin.
Then while holding door in place.
7. Make sure door is parallel with oven face lines (left and
upper side lines) and the door latch heads pass through
the latch holes correctly.
8. Insert the lower oven hinge into oven cavity bottom
flange and then engage the door hinge pin.
Then secure the lower oven hinge firmly with three (3)
mounting screws.
Note: After any service to the door;
(A)Make sure that the upper and lower latch switches are
operating properly.
(Refer to chapter “Test Procedures”.)
(B)An approved microwave survey meter should be used to
assure compliance with proper microwave radiation
emission limitation standards.
DOOR ADJUSTMENT
The door is adjusted by keeping the screws of each hinge
loose. The lower oven hinge can be loosened.
After adjustment, make sure of the following :
1. Door latch heads smoothly catch the latch hook through
the latch holes, and the latch head goes through the
center of the latch hole.
2. Deviation of the door alignment from horizontal line of
cavity face plate is to be less than 1.0mm.
3. The door is positioned with its face depressed toward the
cavity face plate.
4. Re-install outer case and check for microwave leakage
around the door with an approved microwave survey
meter. (Refer to Microwave Measurement Procedure.)
Note: The door on a microwave oven is designed to act as
an electronic seal preventing the leakage of
microwave energy from the oven cavity during the
cook cycle. This function does not require that the
door be air-tight, moisture (condensation)-tight or
light-tight. Therefore, the occasional apperance of
moisture, light or the sensing of gentle warm air
movement around the oven door is not abnormal
and do not of themselves, indicate a leakage of
microwave energy from the oven cavity. If such
were the case, your oven could not be equipped
with a vent, the very purpose of which is to exhaust
the vapor-laden air from the oven cavity.
DOOR REPLACEMENT AND ADJUSTMENT
RE-INSTALL
RE-INSTALL
LOWER OVEN HINGE
UPPER OVEN HINGE
DOOR ASSEMBLY
LATCH
HEADS
Page 34
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32
MICROWAVE MEASUREMENT
After adjustment of door latch switches, monitor switch
and door are completed individually or collectively, the
following leakage test must be performed with a survey
instrument and it must be confirmed that the result meets
the requirements of the performance standard for microwave oven.
REQUIREMENT
The safety switch must prevent microwave radiation emission in excess of 5mW/cm2 at any point 5cm or more from
external surface of the oven.
PREPARATION FOR TESTING:
Before beginning the actual test for leakage, proceed as
follows;
1. Make sure that the test instrument is operating normally
as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for
instrumentations as prescribed by the performance
standard for microwave ovens must be used for testing.
Recommended instruments are:
NARDA 8100
NARDA 8200
HOLADAY HI 1500
SIMPSON 380M
2. Place the oven tray into the oven cavity.
3. Place the load of 275 ± 15ml of water initially at 20 ±
5˚C in the centre of the oven tray. The water container
should be a low form of 600 ml beaker with inside
diameter of approx. 8.5cm and made of an electrically
non-conductive material such as glass or plastic.
The placing of this standard load in the oven is important
not only to protect the oven, but also to insure that any
leakage is measured accurately.
4. Close the door and turn the oven ON with the timer set
for several minutes. If the water begins to boil before the
survey is completed, replace it with 275ml of cool water.
5. Move the probe slowly (not faster that 2.5cm/sec.)
along the gap.
6. The microwave radiation emission should be measured
at any point of 5cm or more from the external surface of
the oven.
mW cm
2
mW cm
2
Microwave leakage measurement at 5 cm distance
SHARP
Page 35
R-9H56
33
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. CLOCK APPERARS ON DISPLAY
Figure O-1. Oven Schematic-OFF Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
3.VARIABLE COOKING CONTROL “HIGH”
4. START PAD TOUCHED.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. “SENSOR COOK” PAD TOUCHED
3. START PAD TOUCHED.
Figure O-2. Oven Schematic-High or Easy Defrost or Reheat Sensor Cooking Condition
CONTROL
UNIT
TEMP.
FUSE
150˚C
THERMAL
CUT-OUT
150˚C (OVEN)
FUSE
M8A
240 V ~ 50Hz
EARTH
LIVE
NEUTRAL
MONITOR RESISTOR
0.8/20W
MONITOR SWITCH
OVEN LAMP
OL
DM
FM
FAN MOTOR
A-7
COM
A-5
A-3
A-1
N.O.
LOWER
LATCH
SWITCH
RY3
RY2
A-9
E-1
E-2
E-3
E-4
E-5
E-6
F-1
F-2
F-3
STOP
SWITCH
THER-
MISTOR
DAMPER
SWITCH
AH SENSOR
CM
DAMPER MOTOR
CONVECTION MOTOR
TTM
TURNTABLE MOTOR
CONVECTION HEATER
MAGNETRON
H.V. RECTIFIER
ASYMMETRIC
RECTIFIER
UPPER
LATCH
SWITCH
THERMAL
CUT-OUT
95˚C (FM)
RY6
RY1
RY5
RY4
N.O. COM.
COM.
N.O.
POWER
TRANSFORMER
CAPACITOR
1.13µ
AC 2100V
CONTROL
UNIT
TEMP.
FUSE
150˚C
THERMAL
CUT-OUT
150˚C (OVEN)
FUSE
M8A
240 V ~ 50Hz
EARTH
LIVE
NEUTRAL
MONITOR RESISTOR
0.8/20W
MONITOR SWITCH
OVEN LAMP
OL
DM
FM
FAN MOTOR
A-7
COM
A-5
A-3
A-1
N.O.
LOWER
LATCH
SWITCH
RY3
RY2
A-9
E-1
E-2
E-3
E-4
E-5
E-6
F-1
F-2
F-3
STOP
SWITCH
THER-
MISTOR
DAMPER
SWITCH
AH SENSOR
CM
DAMPER MOTOR
CONVECTION MOTOR
TTM
TURNTABLE MOTOR
CONVECTION HEATER
MAGNETRON
H.V. RECTIFIER
ASYMMETRIC
RECTIFIER
UPPER
LATCH
SWITCH
THERMAL
CUT-OUT
95˚C (FM)
RY6
RY1
RY5
RY4
N.O. COM.
COM.
N.O.
POWER
TRANSFORMER
CAPACITOR
1.13µ
AC 2100V
NOTE: indicates components with potential above 250V.
Page 36
R-9H56
34
Figure O-4. Oven Schematic-Automatic Mix Cooking Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. CONVECTION PAD TOUCHED.
3.DESIRED TEMO. PAD TOUCHED.
4. START PAD TOUCHED.
Figure O-3. Oven Schematic-Convection Cooking Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. MIX COOKING PAD TOUCHED.
3.DESIRED TEMP. PAD TOUCHED.
4. START PAD TOUCHED.
NOTE: indicates components with potential above 250V.
CONTROL
UNIT
TEMP.
FUSE
150˚C
THERMAL
CUT-OUT
150˚C (OVEN)
FUSE
M8A
240 V ~ 50Hz
EARTH
LIVE
NEUTRAL
MONITOR RESISTOR
0.8/20W
MONITOR SWITCH
OVEN LAMP
OL
DM
FM
FAN MOTOR
A-7
COM
A-5
A-3
A-1
N.O.
LOWER
LATCH
SWITCH
RY3
RY2
A-9
E-1
E-2
E-3
E-4
E-5
E-6
F-1
F-2
F-3
STOP
SWITCH
THER-
MISTOR
DAMPER
SWITCH
AH SENSOR
CM
DAMPER MOTOR
CONVECTION MOTOR
TTM
TURNTABLE MOTOR
CONVECTION HEATER
MAGNETRON
H.V. RECTIFIER
ASYMMETRIC
RECTIFIER
UPPER
LATCH
SWITCH
THERMAL
CUT-OUT
95˚C (FM)
RY6
RY1
RY5
RY4
N.O. COM.
COM.
N.O.
POWER
TRANSFORMER
CAPACITOR
1.13µ
AC 2100V
CONTROL
UNIT
TEMP.
FUSE
150˚C
THERMAL
CUT-OUT
150˚C (OVEN)
FUSE
M8A
240 V ~ 50Hz
EARTH
LIVE
NEUTRAL
MONITOR RESISTOR
0.8/20W
MONITOR SWITCH
OVEN LAMP
OL
DM
FM
FAN MOTOR
A-7
COM
A-5
A-3
A-1
N.O.
LOWER
LATCH
SWITCH
RY3
RY2
A-9
E-1
E-2
E-3
E-4
E-5
E-6
F-1
F-2
F-3
STOP
SWITCH
THER-
MISTOR
DAMPER
SWITCH
AH SENSOR
CM
DAMPER MOTOR
CONVECTION MOTOR
TTM
TURNTABLE MOTOR
CONVECTION HEATER
MAGNETRON
POWER
TRANSFORMER
H.V. RECTIFIER
CAPACITOR
1.13µ
AC 2100V
ASYMMETRIC
RECTIFIER
UPPER
LATCH
SWITCH
THERMAL
CUT-OUT
95˚C (FM)
RY6
RY1
RY5
RY4
N.O. COM.
COM.
N.O.
Page 37
R-9H56
35
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-1. Pictorial Diagram
HV. RECTIFIER
O RG
BLK
ASYMMETRIC
RECTIFIER
MAGNETRON
RED
RED
HV. WIRE A
RED
GRY
HIGH VOLTAGE COMPONENTS
POWER
SUPPLY
COED
NOTE: ORANGE WIRE (LIVE) MUST BE
CONNECTED TO THE CABINET
SIDE TERMINAL OF POWER
TRANSFORMER
TURNTABLE
MOTOR
GRY
BRN
WHT
YLW
YLW
DAMPER
MOTOR
DAMPER
SWITCH
FAN
MOTOR
OVEN
THERMAL
CUT-OUT
150˚C
ORG
OVEN
LAMP
STOP SWITCH
I
C
1
RED
65412
3
PNK
PNK
RED
GRN
1
CN-F
CN-E
4
5
PPL
1
2
BRN
RED
3
CN-A
N.O.
COM
RED
BRN
CN-E
ORG
ORG
BRN
3
UPPER
LATCH
SWITCH
MONITOR
RESISTOR
GRY
PPL
CONTROL PANEL
TEMP.
FUSE
(MG.)
150˚C
CONVECTION
HEATER
THERMISTOR
HIGH VOLTAGE
CAPACITOR
POWER
TRANSFORMER
CONVECTION
MOTOR
GRN
COM
N.O.
GRY
WHT
PRLWHT
BLK
RED
REDWHT
N.O.
COM
PNK
PNK
FUSE M8A
BRN
GRY
1
2
RED
RED
2
1
BRN
COM
N.O.
ORG
PNK
LOWER
LATCH
SWITCH
MONITOR
SWITCH
COM
N.C.
PPL
ORG
BLK
AH SENSOR
RED
WHT
123
CN-F
2
RY3
RY2
CN-A
FAN MOTOR
THERMAL
CUT-OUT
95˚C
RED
BLK
RED
GRY
W
H
T
BRN
G-Y
BLUBLU
BLU
RED
RY1
T1
1
6
5
4
231
357
9
N.O.
N.O.
N.O.
COM
COM
COM
RY3(N.O.)
RY3(COM.)
RY2(N.O.)
BRN
RY2(COM.)
BRN
RED
RY1(N.O.)
PNK
BLK
RY1(COM.)
9
6
7
WHT
8
NOTE:
NEUTRAL (WHITE) WIRE
MUST BE CONNECTED
TO THE TERMINAL WITH
BLACK DOT ON THE
LAMP SPCKET.
GRN
GRN
GRY
Page 38
R-9H56
36
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
AC240V
50Hz
A-9
A-7
COM
N.O.
A-5
A-3
A-1
IF NOT SPECIFIED. 0.01µ/16V
COM
N.O.
COM
OVEN LAMP
TURNTABLE
MOTOR
COM.
POWER
TRANSFORMER
HEATING
ELEMENT
FAN
MOTOR
CONVECTION
MOTOR
DAMPER
MOTOR
F-1F-2F-3E-3E-4E-5E-6E-1E-2
VRS1
a
b
c
d
(J1)
S2
T1
P
S1
1
7
8
5
4
3
11ES1 x 4
D1
D2
D3
D4
RY1
C1 0.1µ/50V
C21
0.01µ/50V
C2 1000µ/35V
+
-
D7
R2 330 1/2W
Q1 2SB793
R1 470
1/2W
ZD1
HZ16-1
D81
Q81
DTD143EA
+
-
R80 470
C82
4.7µ/35V
Q80
DTA114YS
+
-
+
-
C3 3.3µ/50V
C4 0.015µ/25V
R4 750 1/2W
+
C10
22µ/25V
+
-
C5 47µ/16V
C20
Q20 DTA143ES
R20
15K
VA (-15V)
VC (-5V)
C80
0.1µ/50V
ZD3
HZ4A2
R5
15K
C7
Q30
DTA143ES
R10
12 1/2W
R11
24 1W
VP
VF1 31,32
1,2
GND
DOOR
RY2
RY3
RY6
RY5
RY4
D82D83D86
D80
D85D84
Q86 DTA143ES
Q85 DTA143ES
Q84 DTA143ES
Q82 DTB143ES
Q83 DTB143ES
CF1
CST4.00MGW
NOTE :
IF NOT SPECIFIED. 1/4W±5%
IF NOT SPECIFIED. 1SS270A
DOOR
R71 5.1K
D71
R70 100
D70
C70
DOOR SENSING
SWITCH
DAMPER
SWITCH
C60 C61
VC
R61 4.7K
R68 100
R62
75KF
R60 1K
R63
100F
R64
2.2KF
OVEN
THERMISTOR
AH SENSOR
S
C
IC2 IZA495DR
C100 330pF x 4
15
12
10
R100 3.3K x 4
R101
R102
R103
G-12G-11
G-10
G-9G-8G-7G-6G-5
G-4
G-3
G-2
G-1
R91
D91
R92
D92
R93
D93
R94
D94
R95
D95
R96
D96
R97
D97
R98
3.3K x 8
D98
5
160˚C
4
150˚C
3
130˚C
2
70˚C
1
40˚C
0
250˚C
9
230˚C
8
220˚C
7
200˚C
6
180˚C
Frozen
Vegetables
LESS
EASY
DEFROST
MULTI
COOK
POWER
LEVEL
STOP
CLEAR
Reheat
Pie
AUTO START
CLOCK
LOW MIX
CONVEC
1
IC1 IZA589DR
5101520253032
33 35 40 45 50 55 60 64
P30
P32
P31
P34
P35
P36
P37
P00
P01
P02
P03
P04
P05
P06
P07
P10
P11
P12
P13
P14
P15
P16
P17
P20
P21
P22
P23
P24
P25
P26
VCC
VEE
AVSS
VREF
AN7
AN6
AN5
AN4
AN3
AN2
AN1
AN0
P55
P54
P53
P52
P51
P50
P47
P46
P45
P44
P43
P42
P41
P40
RST
XCIN
XCOUT
XIN
XOUT
VSS
P33
FLUORESCENT DISPLAY TUBE
CONTROL UNIT
KEY UNIT
Figure S-2. Control Panel Circuit
SP40
C11
0.1µ/50V
1G
P14
P13
2G
P11
P10
3G
P9
P8
P12
NC
NC
4G
P7
P6
P5
5G
P4
P3
6G
P2
27
26
25
23
22
21
20
19
18,24
17
16
13
12
11
10,14
9
8
7
6
5
4
28
29
P1
P15
P27
(A)(B)(C)
(C) (A) VA
(B)
R51 330 1W
100K x 3
R111
R112
R113
(J6)
(J4)
(J2)
(J7)
(J5)
(J3)
Q40 DTA143ES
R40 3.3K
VA
N.O.
C6 0.1µ/50V
ZD4 HZ5C2
C8
0.1µ/50V
REHEAT
SENSOR
Casseroles
GRILL Desserts
Jacket
Potato
Fresh
Vegetables
HIGH MIX
INSTANT COOK
START
MORE
COOK
CONV
MIX
GRILL
AUTO
COMPU
DEFROST
REHEAT
TEMP
SENSOR
LOW M•LOW MED M•HIGH HIGH
Figure S-2. Contrl Panel Circuit
Page 39
R-9H56
37
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
DIP
,
32 1
R11
(CN-D)
R103
R102
R101
R100
C100
33 40
R91
R92
R93
D91
D92
D93
D94
R94
D95
R95
D97
R96
D96
R97
D98
R98
45
50
55
C6
32
25
4
10
1
5
R113
R112
R111
1
3
CF 1
(R45)
R5
(C45)
C7
C20
IC-1
4
ZD3
ZD4
E
1
C5
+
-
R20
2
3
+
(C46)
(C47 )
(IC-3)
20
1
85
Q40
(R47)
(R48)
(R46)
CN-G
R51
(J6)
(J4)
(J2)
(J7)
(J5)
(J3)
7
IC-2
C4
15
CN-F
8
9
10
11
14
6
R60
R61
R71
(J9)
E
B
E
R49
R40
12
B
(Q87)
13
R4
16
17
(J10)
RY3 RY4
RY5
18
D83
D82
D81
3
1
(CN-C)
(D87)
3
1
C60
R68
R64
R63
C70
19
20
21
-
+
R70
C80
R62
C61
22
D80
Q83
Q82
E
E
B
B
-
+
D70
D71
R1
CN-E
ZD1
E
B
Q1
R2
-
+
+
-
C8
B
E
Q80
R80
C2
24
26
Q20
E
B
C1
C21
23
25
B
E
E
B
C81
Q81
Q86
B
B
E
E
Q85
Q84
27
28
D85
D84
D3
D4
D1
D2
29
30
RY5
RY4
13
45 78
+
-
VRS1
(J1)
31
CN-A
RY6
D86
(J8)
R10
D7
C10
M
1
357 9
DAMP
M
CONV MFAN
POWER
6 1
2
4
153
DAMP
SW
OVEN
TEMP
DOOR
SW
F
SP40
C3
C11
64
P
S1 S2
T1
Figure S-3. Printed Wiring Board
Page 40
R-9H56
38
PARTS LIST
Note: The parts marked "∆" may cause undue microwave exposure.
The parts marked "*" are used in voltage more than 250V.
REF. NO. PART NO. DESCRIPTION Q'TY CODE
*
*
*
*
∆
∆
∆
ELECTRICAL PARTS
1- 1 FH-DZA058WRK0 High voltage rectifier assembly 1 AL
1- 2 FH-HZA041WRE0 Thermistor assembly 1 AN
1- 3 QACCAA040WRE0 Power supply cord 1 AV
1- 4 QFS-CA010WRE0 Fuse (M8A) 1 AE
1- 5 QFS-TA013WRE0 Temperature fuse 150˚C 1 AG
1- 6 QFSHDA002WRE0 Fuse holder 1 AE
1- 7 QSOCLA011WRE0 Oven lamp socket 1 AH
1- 8 QSW-MA111WRE0 Monitor switch 1 AK
1- 9 QSW-MA110WRE0 Stop switch and Damper switch 2 AK
1-10 QSW-MA110WRE0 Upper and lower latch switches 2 AK
1-11 RC-QZA075WRE0 High voltage capacitor 1 AU
1-12 RHET-A139WRE0 Convection heater 1 AY
1-13 RLMPTA029WRE0 Oven lamp 1 AK
1-14 RMOTDA191WRE0 Damper motor 1 AS
1-15 RMOTDA097WRE0 Turntable motor 1 AV
1-16 RMOTEA303WRE0 Cooling fan motor 1 AX
1-17 RMOTEA284WRE0 Convection motor 1 AZ
1-18 RR-WZA003WRE0 Monitor resistor 0.8Ω 20W 1 AG
1-19 RTHM-A085WRE0 Thermal cut-out 150˚C (OVEN) 1 AL
1-20 RTHM-A079WRE0 Thermal cut-out 95˚C (FM) 1 AL
1-21 RTRN-A318WRE0 Power transformer 1 BP
1-22 RV-MZA114WRE0 Magnetron 1 BG
1-23 FDTCTA157WRK0 AH sensor assembly 1 AY
CABINET PARTS
2- 1 FDAI-A181WRY0 Base plate assembly 1 AR
2- 2 FHNG-A092WRM0 Oven hinge (Lower) 1 AF
2- 3 GCABDA074WRW0 Rear cabinet 1 AG
2- 4 GCABUA463WRP0 Outer case cabinet 1 BF
2- 5 GCOVHA156WRP0 Turntable motor cover 1 AB
2- 6 GFTARA001WRW0 Oven lamp access cover 1 AC
2- 7 GLEGPA019WRE0 Foot 4 AD
2- 8 LBNDKA036WRP0 Capacitor holder 1 AG
2- 9 LBSHC0032WRE0 Cord bushing 1 AB
2-10 LSTPPA141WRF0 Cord anchorage (Upper) 1 AD
2-11 LSTPP0009YBF0 Cord anchorage (Lower) 1 AC
2-12 MLEVPA122WRF0 Latch lever 1 AD
2-13 PHOK-A043WRF0 Latch hook 1 AM
CONTROL PANEL PARTS
3- 1 CPWBFA599WRK0 Control unit (Not Replaceble Item) 1 BN
3- 1A QCNCMA227DRE0 5-pin connector(A) 1 AC
3- 1B QCNCMA267DRE0 6-pin connector(E) 1 AC
3- 1C QCNCMA237DRE0 3-pin connector(F) 1 AD
3- 1D QCNCWA030DRE0 12-pin connector(G) 1 AF
3- 1E RV-KXA054DRE0 Fluorescent display tube 1 AW
C1 RC-KZA087DRE0 Capacitor 0.1µF 50V 1 AB
C2 VCEAB31VW108M Capacitor 1000µF 35V 1 AF
C3 VCEAB31HW335M Capacitor 3.3µF 50V 1 AA
C4 VCKYB11EX153N Capacitor 0.015µF 25V 1 AA
C5 VCEAB31CW476M Capacitor 47µF 16V 1 AA
C6 RC-KZA087DRE0 Capacitor 0.1µF 50V 1 AB
C7 VCKYD11CY103N Capacitor 0.01µF 16V 1 AH
C8 RC-KZA087DRE0 Capacitor 0.1µF 50V 1 AB
C10 VCEAB31EW226M Capacitor 22µF 25V 1 AA
C11 RC-KZA087DRE0 Capacitor 0.1µF 50V 1 AB
C20 VCKYD11CY103N Capacitor 0.01µF 16V 1 AH
C21 VCTYF31HF103Z Capacitor 0.01µF 50V 1 AB
C60-61 VCKYD11CY103N Capacitor 0.01µF 16V 2 AH
C70 VCKYD11CY103N Capacitor 0.01µF 16V 1 AH
C80 VCEAB31HW104M Capacitor 0.1µF 50V 1 AM
C81 VCEAB31VW475M Capacitor 4.7µF 35V 1 AA
C100 RMPTEA009DRE0 Capacitor array 330pF x 4 1 AE
CF1 RCRS-A012DRE0 Ceramic resonator (CST4.00MGW) 1 AD
D1-4 VHD11ES1///-1 Diode (11ES1) 4 AB
D7 VHD1SS270A/-1 Diode (1SS270ATA) 1 AA
D70-71 VHD1SS270A/-1 Diode (1SS270ATA) 2 AA
D80-86 VHD1SS270A/-1 Diode (1SS270ATA) 7 AA
D91-98 VHD1SS270A/-1 Diode (1SS270ATA) 8 AA
Page 41
R-9H56
39
Note: The parts marked "∆" may cause undue microwave exposure.
The parts marked "*" are used in voltage more than 250V.
REF. NO. PART NO. DESCRIPTION Q'TY CODE
∆
∆
IC1 RH-IZA589DRE0 LSI 1 AX
IC2 RH-IZA495DRE0 IC 1 AL
Q1 VS2SB793///-4 Transistor (2SB793) 1 AC
Q20 VSDTA143ES/1B Transistor (DTA143ES) 1 AB
Q30 VSDTA143ES/1B Transistor (DTA143ES) 1 AB
Q40 VSDTA143ES/1B Transistor (DTA143ES) 1 AB
Q80 VSDTA114YS/-3 Transistor (DTA114YS) 1 AB
Q81 VSDTD143EA/-4 Transistor (DTD143EA) 1 AC
Q82-83 VSDTB143ES/-3 Transistor (DTB143ES) 2 AC
Q84-86 VSDTA143ES/1B Transistor (DTA143ES) 3 AB
R1 VRD-B12HF471J Resistor 470 ohm 1/2W 1 AA
R2 VRD-B12HF331J Resistor 330 ohm 1/2W 1 AA
R4 VRD-B12HF751J Resistor 750 ohm 1/2W 1 AA
R5 VRD-B12EF153J Resistor 15k ohm 1/4W 1 AA
R10 VRD-B12HF120J Resistor 12 ohm 1/2W 1 AB
R11 VRS-B13AA240J Resistor 24 ohm 1W 1 AB
R20 VRD-B12EF153J Resistor 15k ohm 1/4W 1 AA
R40 VRD-B12EF332J Resistor 3.3k ohm 1/4W 1 AA
R51 VRS-B13AA331J Resistor 330 ohm 1W 1 AA
R60 VRD-B12EF102J Resistor 1k ohm 1/4W 1 AA
R61 VRD-B12EF472J Resistor 4.7k ohm 1/4W 1 AA
R62 VRN-B12EK753F Resistor 75k ohm(F) 1/4W 1 AA
R63 VRN-B12EK101F Resistor 100 ohm(F) 1/4W 1 AA
R64 VRN-B12EK222F Resistor 2.2k ohm(F) 1/4W 1 AA
R68 VRD-B12EF101J Resistor 100 ohm 1/4W 1 AA
R70 VRD-B12EF101J Resistor 100 ohm 1/4W 1 AA
R71 VRD-B12EF512J Resistor 5.1k ohm 1/4W 1 AA
R80 VRD-B12EF471J Resistor 470 ohm 1/4W 1 AA
R91-98 VRD-B12EF332J Resistor 3.3k ohm 1/4W 8 AA
R100-103 VRD-B12EF332J Resistor 3.3k ohm 1/4W 4 AA
R111-113 VRD-B12EF104J Resistor 100k ohm 1/4W 3 AA
RY1-3 RRLY-A083DRE0 Relay (OMIF-S-118LM) 3 AK
RY4-6 RRLY-A078DRE0 Relay (OJ-SS-118LM) 3 AG
SP40 RALM-A014DRE0 Buzzer (PKM22EPT) 1 AG
T1 RTRNPA089DRE0 Transformer 1 AU
VRS1 RH-VZA032DRE0 Varistor (10G471K) 1 AE
ZD1 VHEHZ161///-1 Zener diode (HZ16-1) 1 AA
ZD3 VHEHZ4A2///-1 Zener diode (HZ4A2) 1 AA
ZD4 VHEHZ5C2///-1 Zener diode (HZ5C2) 1 AA
3- 2 FPNLCB100WRK0 Control panel frame with key unit 1 BE
3- 2-1 FUNTKA608WRE0 Key unit 1 BB
3- 2-2 HPNLCA800WRF0 Panel grill 1 AL
3- 3 JBTN-A766WRF0 Open button 1 AG
3- 4 MSPRCA050WRE0 Open button spring 1 AB
3- 5 LANGTA197WRW0 Control panel back plate 1 AK
3- 6 MLEVFA057WRW0 Open lever 1 AE
3- 7 NSFTTA042WRE0 Open shaft 1 AE
3- 8 XEPSD30P10XS0 Screw ; control unit mtg. 3 AA
3- 9 XCPSD40P12000 Screw ; control panel back plate mtg. 4 AA
OVEN PARTS
4- 1 FBRGMA002WRE0 Bearing assembly 1 AQ
4- 2 FDUC-A124WRW0 Steam duct assembly 1 AN
4- 3 NFANJA020WRE0 Cooling fan 1 AE
4- 4 FFTA-A034WRK0 Damper ass’y 1 AM
4- 5 FOVN-A316WRY0 Oven cavity 1 AX
4- 6 FROLPA072WRK0 Roller stay 1 AL
4- 7 LANGFA089WRW0 Chassis support 1 AE
4- 8 LANGQA407WRW0 Convection motor mounting plate 1 AG
4- 9 LANGQA213WRW0 Lamp socket mounting angle 1 AE
4-10 LANGQA369WRP0 Thermal cut-out mounting angle 1 AB
4-11 LANGTA196WRW0 Bearing mounting plate 1 AD
4-12 LBNDK0054WRE0 Heater element holder 2 AB
4-13 LFIX-A013WRW0 Bearing holder plate 1 AB
4-14 LHLDKA009WRF0 Cord holder 1 AD
4-15 MCAMPA030WRF0 Damper cam 1 AC
4-16 MHNG-A165WRM0 Oven hinge (upper) 1 AE
4-17 NBLTKA005WRE0 Convection fan belt 1 AF
4-18 NCPL-A021WRF0 Turntable coupling 1 AE
4-19 NFANMA019WRW0 Convection fan 1 AE
4-20 PCUSGA236WRP0 Cushion 1 AC
4-21 NPLYBA025WRF0 Pulley (F) 2 AC
Page 42
R-9H56
40
Note: The parts marked "∆" may cause undue microwave exposure.
The parts marked "*" are used in voltage more than 250V.
REF. NO. PART NO. DESCRIPTION Q'TY CODE
∆
∆
∆
∆
*
4-22 NSFTTA114WRE0 Damper shaft 1 AB
4-23 NTNT-A019WRH0 Turntable tray 1 AT
4-24 PCOVPA301WRE0 Waveguide cover 1 AE
4-25 PCOVPA292WRF0 AH sensor cover 1 AD
4-26 PCUSGA410WRP0 Transformer cushion D 1 AD
4-27 PCUSUA424WRP0 Magnetron duct cushion 1 AG
4-28 PCUSUA196WRP0 Cushion 2 AD
4-29 PCUSUA425WRP0 Cushion 1 AG
4-30 PCUSUA197WRP0 Steam cushion C 2 AD
4-31 FDUC-A279WRK0 Heater duct assembly 1 AT
4-32 PDUC-A269WRW0 Damper duct 1 AK
4-33 PDUC-A270WRF0 Cooling fan duct 1 AL
4-34 PFPF-A138WRE0 Thermal protection sheet (Left) 1 AK
4-35 PREFHA028WRW0 Thermal protection plate (Left) 1 AS
4-36 PFPF-A139WRE0 Thermal protection sheet (Right) 1 AF
4-37 PGLSPA181WRE0 Oven lamp screen 1 AG
4-38 PREFHA053WRW0 Thermal protection plate (Right) 1 AQ
4-39 PCUSUA167WRP0 Cushion 2 AF
4-40 PFPF-A064WRE0 Thermal protection sheet 1 AE
4-41 PSKR-A153WRW0 Air guide (Bottom) 1 AK
4-42 PSKR-A171WRW0 Magnetron air guide 1 AF
4-43 PSKR-A161WRW0 Air guide (Right) 1 AF
DOOR PARTS
5 CDORFA648WRK0 Door assembly, complete. 1 BS
5- 1 DDORFA711WRY0 Door panel 1 BG
5- 2 GCOVHA155WRF0 Choke cover 1 AP
5- 3 GWAKPA142WRF0 Door frame 1 AT
5- 4 HDECQA123WRF0 Door sash (right) 1 AF
5- 5 HDECQA124WRF0 Door sash (left) 1 AF
5- 6 LSTPPA045WRF0 Upper latch head 1 AB
5- 7 LSTPPA046WRF0 Lower latch head 1 AB
5- 8 MSPRTA163WRE0 Latch spring 1 AD
5- 9 NSFTTA044WRE0 Latch shaft 1 AC
5-10 PGLSPA422WRE0 Door glass 1 BA
MISCELLANEOUS
6- 1 FAMI-A059WRM0 High rack 1 AP
6- 2 FAMI-A058WRM0 Low rack 1 AP
6- 3 TCADCA546WRR0 Cook book 1 AZ
6- 4 TINSEA631WRR0 Operation manual 1 AL
6- 5 TLABNA191WRR0 Menu label 1 AD
6- 6 FW-VZB347WRE0 Main wire harness 1 BB
6- 7 QW-QZA202WRE0 High voltage wire A 1 AK
6- 8 TSPCNC031WRR0 Name plate 1 AD
6- 9 FW-VZB342WRE0 Thermistor harness 1 AN
6-10 TLABSA029WRR0 Fuse label 1 AC
6-11 LHLDWA012WRE0 Purse lock “L” 1 AB
6-12 QTANP0020YBE0 Connector CE-230 1 AA
6-13 TCAUHA055WRR0 Caution label 1 AF
SCREWS, NUTS AND WASHERS
7- 1 XHTSD40P08RV0 Screw; 4mm x 8mm 5 AA
7- 2 LX-BZ0202WRE0 Special screw 2 AB
7- 3 LX-CZA020WRE0 Special screw 6 AA
7- 4 XCTWW40P08000 Screw; 4mm x 8mm 15 AA
7- 5 XCBWW30P06000 Screw; 3mm x 6mm 4 AA
7- 6 LX-CZ0052WRE0 Special screw 2 AA
7- 7 XBPSD40P06KS0 Screw; 4mm x 6mm 2 AA
7- 8 XFPSD30P10000 Screw; 3mm x 10mm 1 AA
7- 9 XBPSD30P14K00 Screw; 3mm x 14mm 1 AA
7-10 XOTSD40P12RV0 Screw; 4mm x 12mm 11 AA
7-11 XBPSD40P25000 Screw; 4mm x 25mm 2 AA
7-12 XFPSD40P25000 Screw; 4mm x 25mm 2 AA
7-13 LX-CZA030WRE0 Special screw 2 AA
7-14 XBTWW40P06000 Screw; 4mm x 6mm 8 AA
7-15 XCPSD30P06000 Screw; 3mm x 6mm 5 AA
7-16 XWVSD60-07000 Washer; 6mm x 0.7mm 1 AA
7-17 XCPSD30P08X00 Screw; 3mm x 8mm 6 AA
7-18 XCPSD30P08000 Screw; 3mm x 8mm 3 AA
7-19 XCPSD40P08000 Screw; 4mm x 8mm 7 AA
7-20 XCTSD40P08000 Screw; 4mm x 8mm 7 AA
Page 43
R-9H56
41
7-21 XFPSD30P08000 Screw; 3mm x 8mm 2 AA
7-22 XFPSD40P08K00 Screw; 4mm x 8mm 5 AA
7-23 XFPSD40P08000 Screw; 4mm x 8mm. 5 AA
7-24 XFPSD60P14JS0 Screw; 6mm x 14mm 2 AC
7-25 XNESD40-32000 Nut; 4mm x 3.2mm 4 AA
7-26 XNEUW40-32000 Nut; 4mm x 3.2mm 1 AA
7-27 XOTSE40P12000 Screw; 4mm x 12mm 4 AA
7-28 LX-WZA004WRE0 Washer 1 AA
7-29 XOTSD40P12000 Screw; 4mm x 12mm 8 AA
7-30 XWSUW40-10000 Washer; 4mm x 1mm 1 AA
7-31 LX-WZA022WRE0 Washer 1 AA
7-32 LX-CZA060WRE0 Special screw 1 AC
Note: The parts marked "∆" may cause undue microwave exposure.
The parts marked "*" are used in voltage more than 250V.
REF. NO. PART NO. DESCRIPTION Q'TY CODE
HOW TO ORDER REPLACEMENT PARTS
To have your order filled prompty and correctly, please furnish the following information.
1. MODEL NUMBER 2. REF. NO.
3. PART NO. 4. DESCRIPTION
Page 44
R-9H56
42
OVEN AND CABINET PARTS
6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
1-13
1-7
7-29
7-10
7-20
7-19
A
7-1
7-29
1-22
4-3
7-22
4-33
4-42
4-27
7-25
1-16
7-11
TO OVEN
BASE PLATE
7-4
4-13
4-1
4-21
7-4
4-17
4-34
1-12
7-5
7-30
7-26
4-19
7-14
1-2
7-5
7-4
7-7
4-21
1-17
4-8
4-12
7-5
4-5
4-18
4-24
7-14
7-20
7-21
4-23
4-6
2-8
1-1
7-19
7-4
1-4
1-10
4-26
1-9 4-36
4-38
4-22
4-32
7-9
7-19
4-4
1-9
1-14
7-15
4-15
7-24
7-16
1-21
4-20
4-39
7-10
2-7
7-1
2-5
7-23
4-41
7-28
1-23
4-25
4-2
4-30
4-30
4-28
4-11
7-31
4-28
4-29
2-11
4-7
4-37
7-22
x3
6-9
1-15
2-1
x4
1-11
7-23
7-22
x3
4-35
6-13
2-6
A
x3
7-14
2-3
7-32
7-6
x4
4-31
6-5
2-12
2-13
1-8
7-8
2-4
7-29
7-13
x 3
7-27
7-27
7-27
x2
2-2
7-3
x3
4-16
7-3
x3
1-19
7-15
4-39
7-10
1-10
4-14
1-5
4-43
7-1
7-13
4-9
4-40
x2
x2
x2
6-10
7-1
1-18
1-6
7-22
7-12
2-10
1-3
2-9
7-29
7-29
7-22
7-1
4-10
1-20
7-15
x2
x2
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6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
CONTROL PANEL PARTS
5-1
5-10
7-17
5-5
5-3
7-25
5-2
7-2
5-7
5-8
5-9
5-6
7-18
7-19
x3
7-17
5
x6
5-4
x3
DOOR PARTS
3-2
3-1
3-8
3-5
3-9
3-6
3-7
7-10
6-8
3-3
3-4
7-10
7-10
3-2-1
x 3
x 4
3-2-2
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6
45
1
2
3
6
45
1
2
3
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
MISCELLANEOUS
PACKING AND ACCESSORIES
6-1
Actual wire harness may be different than illustration.
6-9
6-12
6-7
6-2
6-11
6-6
TURNTABLE TRAY
INSTRUCTION BOOK
AND COOK BOOK
ROLLER STAY
TRAY PACKING FOAM
SPADPA198WRE0
DOOR PROTECTION SHEET
SPADPA178WRE0
MICROWAVE OVEN
PACKING PAD KIT
CPADBA083WRK0
PLASTIC BAG
SSAKHA012WRE0
TRAY HOLDER
(SPADFA348WRE0)
Not replaceable items.
PACKING CASE
SPAKCC385WRE0
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Page 48
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'94SHARP CORP. (11K0.620E) Printed in Australia
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