In the interest of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ...................INSIDE FRONT COVER
BEFORE SERVICING ...........................................................................................................................................1
GENERAL INFORMATION................................................................................................................................... 4
TEST PROCEDURE ............................................................................................................................................14
TOUCH CONTROL PANEL .................................................................................................................................21
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................27
CONTROL PANEL CIRCUIT ...............................................................................................................................34
PARTS LIST ........................................................................................................................................................36
PACKING AND ACCESSORIES .........................................................................................................................39
SHARP ELECTRONICS CORPORATION
Service Headquarters: Sharp Plaza, Mahwah, New Jersey 07430-2135
R-930AK
R-930AW
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE
ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3)
seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and
latches, (5) evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave
generation and transmission systems shall be repaired, replaced, or adjusted by procedures described
in this manual before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be
performed on each oven prior to release to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave
Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS
CORPORATION immediately 1- (800) 237-4277.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven
and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's
Center for Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found
with emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unit
until the oven has been brought into compliance.
R-930AK
R-930AW
1
R-930AK
R-930AW
MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven
should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition
by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external
surface of the oven.
2) Safety interlock switches
Primary interlock relay and door sensing switch shall prevent microwave radiation emission in excess of the requirement
as above mentioned, secondary interlock switch shall prevent microwave radiation emission in excess of 5 mW/cm2 at
any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard
for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5˚C (68˚F) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)
and made of an electrically nonconductive 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) Set the cooking control on Full Power Cooking Mode
5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement)
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal
has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed
latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the secondary interlock switch does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.
2
SERVICE MANUAL
CONVECTION
MICROWAVE OVEN
PRODUCT DESCRIPTION
R-930AK
R-930AW
R-930AK / R-930AW
FOREWORD
This Manual has been prepared to provide Sharp Electronics
Corp. Service Personnel with Operation and Service Information for the SHARP CONVECTION MICROWAVE OVENS R930AK / R-930AW.
It is recommended that service personnel carefully study the
entire text of this manual so that they will be qualified to render
satisfactory customer service.
Check the interlock switches and the door seal carefully.
Special attention should be given to avoid electrical shock and
microwave radiation hazard.
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
GENERAL INFORMATION
GROUNDING INSTRUCTIONS
This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed
and grounded in accordance with the National Electrical Code and local codes and ordinances.
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the
electric current.
WARNING: Improper use of the grounding plug can result in a risk of electric shock.
4
R-930AK
R-930AW
Electrical Requirements
The electrical requirements are a 115 -120 volt 60 Hz, AC only,
15 or 20 amp. fused electrical supply. It is recommended that a separate
3-Pronged Plug
Grounded
Receptacle Box
circuit serving only this appliance be provided. When installing this
appliance, observe all applicable codes and ordinances.
A short power-supply cord is provided to reduce risks of becoming
entangled in or tripping over a longer cord.
Where a two-pronged wall-receptacle is encountered, it is the personal
responsibility and obligation of the customer to contact a qualified
Grounding Pin
electrician and have it replaced with a properly grounded three-pronged
wall receptacle or have a grounding adapter properly grounded and
polarized. If an extension cord must be used, it should be a 3-wire, 15
3-Pronged Receptacle
amp. or more cord. Do not drape over a countertop or table where it can
be pulled on by children or tripped over accidentally.
CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM
THIS PLUG.
OVEN DIAGRAM
15
116
2
6
1. Ventilation openings. (Rear side)
2. Oven door with see-through window.
3. Oven lamp.
4. Turntable support.
5. Removable turntable.
The turntable will rotate clockwise or
counterclockwise.
6. Safety door latches.
The oven will not operate unless the door is
securely closed.
1 Hamburgers
2 Chicken pieces
3 Steaks
4 Fish steaks
1 Chicken
2 Turkey
3 Turkey breast
4 Pork
1 Bundt cake
2 Cookies
3 Muffins
4 French fries
COMPU
BROIL
COMPU
ROAST
COMPU
BAKE
PREHEAT CONVECBROIL
SLOW
COOK
12345
100˚F150˚F275˚F 300˚F 325˚F
67890
350˚F375˚F400˚F 425˚F 150˚F
KITCHEN
TIMER
LOW MIX
BAKE
CLOCK
POWER
LEVEL
HIGH MIX
ROAST
ST OP
TCLEAR
START
TOUCH ON
5
R-930AK
R-930AW
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions during
oven operation.
OFF CONDITION
Closing the door activates the door sensing switch and
secondary interlock switch. (In this condition, the monitor
switch contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the
control unit. (Figure O-1).
1. The display will show "SHARP SIMPLY THE BEST
PRESS CLEAR AND PRESS CLOCK".
To set any program or set the clock, you must first touch
the STOP/CLEAR pad. The display will clear, and " : "
will appear.
NOTE: When the door is opened, the oven lamp comes on.
2. A signal is input to the control unit, energizing the coil of
shut-off relay (RY-4). RY4 contacts close, completing a
circuit to the damper motor. The damper motor now
operates moving the damper to the open position, thereby
closing the contacts of the damper switch inputs a signal
to the control unit. The coil of relay RY-4 is de-energized,
opening its contacts, thereby turning off the damper
motor.
COOKING CONDITION
Program desired cooking time Variable Cooking Control by
touching the 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 the relays are turned on as follows.
(For details, refer to Figure O-2)
RELAYCONNECTED COMPONENTS
RY-1Oven lamp/Turntable motor
RY-2Power transformer
RY-3Heating element
RY-4Damper motor
RY-5Convevtion motor
RY-6Fan motor
2. 120 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3 volts A.C.
output on the filament winding, and approximately 2360
volts A.C. on the high voltage winding.
3. The filament winding voltage heats the magnetron
filament and the H.V. winding voltage is sent to a voltage
doubler circuit.
4. The microwave energy produced by the magnetron is
channelled through the waveguide into the cavity feedbox, and then into the 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, monitor
switch, door sensing switch, the primary interlock relay
and the secondary interlock switch are activated with the
following results. The circuits to the turntable motor, the
cooling fan motor, and the 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 primary interlock relay and the secondary interlock
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 position, the primary
interlock relay and the secondary interlock 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 primary interlock relay and the secondary interlock
switch close.
If the primary interlock relay and the secondary interlock
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 monitor fuse, primary interlock
relay and the secondary interlock switch, causing the monitor fuse to blow.
POWER LEVEL P-0 TO P-90 COOKING
When Variable Cooking Power is programmed, the 120
volts A.C. is supplied to the power transformer intermittently
through the contacts of relay (RY-2). RY-2 is operated by
the control unit within an varying time base. Microwave
power operation is as follows:
VARI-MODEON TIMEOFF TIME
Power 10(P-HI)32 sec.0 sec.
(100% power)
Power 9(P-90)30 sec.2 sec.
(approx. 90% power)
Power 8(P-80)26 sec.6 sec.
(approx. 80% power)
Power 7(P-70)24 sec.8 sec.
(approx. 70% power)
Power 6(P-60)22 sec.10 sec.
(approx. 60% power)
Power 5(P-50)18 sec.14 sec.
(approx. 50% power)
Power 4(P-40)16 sec.16 sec.
(approx. 40% power)
Power 3(P-30)12 sec.20 sec.
(approx. 30% power)
Power 2(P-20) 8 sec.24 sec.
(approx. 20% power)
Power 1(P-10) 6 sec.26 sec.
(approx. 10% power)
Power 0(P-0) 0 sec.32 sec.
(0% power)
Note:The ON/OFF time ratio does not correspond with
the percentage of microwave power, because
approx. 2 seconds are needed for heating of the
magnetron filament.
6
R-930AK
R-930AW
CONVECTION COOKING CONDITION
PREHEATING CONDITION
Program desired convection temperature by touching the
CONVECTION pad and the Temperature pad.
When the START pad is touched, the following operations
occur:
1. The coil of shut-off relays (RY1, RY3,RY5 and RY6) are
energized, the oven lamp, cooling fan motor, turntable
motor and convection motor are turned on.
2. The coil of relay (RY4) is energized by the control 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 control
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 control
unit and the main supply voltage is applied to the heating
element.
4. When the oven temperature reaches the selected preheat
temperature, the following operations occur:
4-1 The heater relay is de-energized by the control unit
temperature circuit and thermistor, opening the
circuit to the heating element.
4-2. The oven will continue to function for 30 minutes,
turning the heater on and off, as needed to maintain
the selected preheat temperature. The oven will
shut-down completely after 30 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.
Touch the CONVEC pad first and then touch the Temperature pad. And program desired cooking time by touching the
Number pads.
When the START pad is touched, the following operations
occur:
1. The numbers on the digital read-out start to 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 heating element 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 275˚F, the circuit to RY6 will be maintained (by
the thermistor circuit) to continue operation of the cooling
fan motor until the temperature drops below 245˚F, 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.
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
Touch the HIGH MIX/ROAST or the LOW MIX/BAKE pad
first. And then program desired cooking time by touching the
Number pads. The LOW MIX/BAKE pad is preprogrammed
for 350˚F with 10% microwave power, while the HIGH MIX/
ROAST pad is preprogrammed for 300˚F with 30% microwave power. When the START pad is touched, the following
operations occur:
1. The numbers on the digital read-out start to count down
to zero.
2. The shut-off relays (RY1,RY2,RY3,RY5 and RY6) are
energized, turning on the oven lamp, turntable motor,
cooling fan motor and convection fan 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, applying the main
supply voltage to the heating element.
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 alternated to the heating
element and power transformer.
6-2. The heating element operates through the heater
relay (RY3) contacts and the power transformer
operates through the primary interlock relay (RY2)
contacts.
6-3. These are operated by the control 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.
the convection heater is energized only if the cavity
temperature drops below the set temperature.
SENSOR COOKING CONDITION
Using the SENSOR COOK function, the foods are cooked
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 vapor is developed.
7
= 300˚F
R-930AK
R-930AW
The sensor “senses” the vapor 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 experiment with each food category and inputted into the LSI.
An example of how sensor works:
1. Potatoes at room temperature.
Vapor is emitted very slowly.
MICROWAVE
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
AH SENSOR
MICROWAVE
cooking time and variable
power.
Cooking Sequence.
1. Touch SENSOR COOK pad.
NOTE: The oven should not be operated on SENSOR
COOK immediately after plugging in the unit. Wait
two minutes before cooking on SENSOR COOK.
2. Select desired Sensor setting.
3. Touch START pad.
The coil of shut-off relay (RY1, RY6) is energized, the
oven lamp and cooling fan motor are turned on, but the
power transformer is not turned on.
4. After about 16 seconds, the cook relay (RY-2) 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 vapor from the oven cavity and sensor.
NOTE: During this first stage, do not open the door or touch
STOP/CLEAR pad.
5. When the sensor detects the vapor 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.
6. When the timer reaches zero, an audible signal sounds.
The shut-off relay and cook relay are de-energized and
the power transformer, oven lamp, etc. are turned off.
7. 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.
COMPU BROIL/ COMPU ROAST/ COMPU BAKE
COMPU BROIL/ ROAST/ BAKE will automatically compute
the oven temperature, microwave power and cooking time
for baking, roasting and broiling. Set the desired program by
touching the COMPU BROIL/ ROAST/ BAKE 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 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, RY5 and RY6) are energized,
turning on the oven lamp, turntable motor, cooling fan
motor and convection motor. The power supply voltage
is applied to the heating element.
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 COMPU BROIL/ ROAST/ BAKE 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.
COMPU DEFROST COOKING
The COMPU DEFROST key is a special function key to
defrost meats and poultry faster and better. COMPU DEFROST automatically defrosts roast beef, etc.. When the
COMPU DEFROST is selected and the food weight is
entered by using the COMPU DEFROST pad, the oven will
cook according to the special cooking sequence.
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 is accomplished by the LSI repeatedly measuring 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 greater 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.
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.
CONVECTION
THERMISTOR
8
MOTOR
Sensing
Voltage
3
0 2243064 (sec.)
ON
OFF
3 sec.
ON
OFF
ON
OFF
Sensing the voltage across the temperature measurement circuit.
6 sec.
32 (sec.)
R-930AK
R-930AW
IMPORTANT:
During sensor cooking operation, the fire sensing operation sequence will not begin until the AH sensor has
SCHEMATIC DIAGRAM
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. CLOCK APPEARS ON DISPLAY.
MAGNETRON
TEMPERATURE
FUSE
TTM
TURNTABLE MOTOR
FM
OL
OVEN LAMP
FAN MOTOR
CM
CONVECTION MOTOR
DM
A-7
DAMPER MOTOR
A-9
A-1
CONTROL UNIT
AH SENSOR
RY4
A-3
DOOR
SENSING
SWITCH
FUSE
OUTER
CASE
SWITCH
120V
60Hz
OUTER
CASE
SWITCH
CONV.
THERMAL
CUT-OUT
SECONDARY
INTERLOCK
SWITCH
detected vapors and initiated a sensor cooking cycle.
This is because the operation of the convection fan
would interfere with the AH sensor's vapor detection.
This outer case mounting screw is
pushing the actuator.
DESCRIPTION AND FUNCTION OF COMPONENTS
R-930AK
R-930AW
DOOR SENSING AND SECONDARY INTERLOCK
SWITCHES
The door sensing switch in the primary interlock system is
mounted in the upper position on the latch hook, the
secondary interlock switch is mounted in the lower position
on the latch hook. They are activated by the latch heads on
the door. When the door is opened, the switches interrupt
the circuit to all components. A cook cycle cannot take place
until the door is firmly closed thereby activating both interlock switches. The primary interlock system consists of the
door sensing switch and primary interlock relay located on
the control circuit board.
DOOR SENSING
SWITCH
MONITOR FUSE
MONITOR SWITCH
SECONDARY
INTERLOCK
SWITCH
OUTER CASE SWITCHES
The two outer case switches are mounted near the power
supply cord at the oven cavity rear plate. When the outer
case cabinet is installed with the screws, one of the screws
pushes the actuator and then the actuator pushes each
plungers of the two outer case switches and their contacts
are closed. When a cabinet mounting screw which is pushing the actuator is removed, the two outer case switches
interrupt the circuit to the all components.
WARNING
The circuit to all components can be connected to the
power supply without the outer case cabinet by reinstalling the cabinet mounting screw. BUT AT THAT TIME,
NEVER TOUCH ANY PARTS OF THE HIGH VOLTAGE
CIRCUIT TO AVOID ELECTROCUTION.
Figure D-1. Door sensing switch, monitor switch and
secondary interlock switches
MONITOR SWITCH
The monitor switch is mounted on the middle position of
latch hook. It is activated (the contacts opened) by the lower
latch head while the door is closed. The switch is intended
to render the oven inoperative by means of blowing the
monitor fuse when the contacts of the primary interlock relay
and secondary interlock switch fail to open when the door is
opened.
Functions:
1. When the door is opened, the monitor switch contact
close (to the ON condition) due to their being normally
closed. At this time the door sensing and secondary
interlock switches are in the OFF condition (contacts
open) due to their being normally open contact switches.
2. As the door goes to a closed position, the monitor switch
contacts are first opened and then the door sensing
switch and the secondary interlock switch contacts close.
(On opening the door, each of these switches operate
inversely.)
3. If the door is opened, and the primary interlock relay and
secondary interlock switch contacts fail to open, the
monitor fuse blows simultaneously with closing of the
monitor switch contacts.
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE TEST THE DOOR SENSING SWITCH,
PRIMARY INTERLOCK RELAY, SECONDARY
INTERLOCK SWITCH AND MONITOR
SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”).
NOTE: MONITOR FUSE AND MONITOR SWITCH ARE
REPLACED AS AN ASSEMBLY.
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 heater relay to operate, thus the current to the
heating element is turned ON/OFF.
MAGNETRON TEMPERATURE FUSE.
The temperature fuse located on the waveguide is designed
to prevent damage to the magnetron if an over heated
condition develops in the megnetron due to cooling fan
failure, obstructed air guide, dirty or blocked air intake, etc.
Under normal operation, the temperature fuse remains
closed. However, when abnormally high temperatures are
reached within the magnetron, the temperature fuse will
open at 302˚F(150˚C) causing the oven to shut down.
CONV. THERMAL CUT-OUT
The thermal cut-out located on the left side of the thermal
protection plate (left) is designed to prevent damage to the
heater unit if an over heated condition develops in the
heating unit due to convection fan failure, thermistor failure,
obstructed air ducts, dirty or blocked air intake, etc.
Under normal operation, the thermal cut-out remains closed.
However, when abnormally high temperatures are reached
within the heater unit, the thermal cut-out will open at
302˚F(150˚C) causing the oven to shut down.
When the thermal cut-out has cooled, the thermal cut-out
closes at 266˚F(130˚C).
11
R-930AK
R-930AW
HEATING ELEMENT
The heating element is located at the left side 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 heating element.
CONVECTION COOKING SYSTEM
This oven is designed with a hot air heating system where
food is not directly heated by the heating element, but is
heated by forced circulation of the hot air produced by the
heating element.
The air heated by the heating element 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 center of the oven
cavity left side wall.
Without leaving the oven, this hot air is reheated by the
heating element, 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 heating element is de-energized.
When the temperature inside the oven cavity drops below
the selected temperature, the heating element 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 heating element is
de-energized and the convection fan stops operating and
the oven shuts off.
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 the damper switch is closed (ON
position).
1-4. The signal from damper switch is re-sensed in the
control unit and shut-off relay (RY4) is turned off.
1-5. The 120 volts A.C. to the damper motor is removed
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.
DAMPER OPEN-CLOSE MECHANISM
DAMPER SHAFT
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 control unit.
DAMPER DUCT
DAMPER
Microwave Cooking:
Damper is in the open position, because a portion of cooling
air is channelled through the cavity to remove steam and
vapors given off from the heating foods.
It is then exhausted at the top of the oven cavity into a
DAMPER CAM
DAMPER SWITCH
DAMPER MOTOR
condensation compartment.
Convection Cooking:
Figure D-2. Damper Mechanism
TROUBLESHOOTING GUIDE
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.
IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, primary interlock
relay, door sensing switch and secondary interlock switch before replacing the monitor fuse. If monitor fuse
is replaced, the mintor switch must olso be replaced at the same time. Use part FFS-BA012WRK0 as an
assembly.
12
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CONDITION
TEST PROCEDURE
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
AMAGNETRON
BPOWER TRANSFORMER
CH.V. RECTIFIER ASSEMBLY
DHIGH VOLTAGE CAPACITOR
ESECONDARY INTERLOCK SWITCH
FPRIMARY INTERLOCK SYSTEM
GMONITOR SWITCH
HMONITOR FUSE
IMAGNETRON TEMPERATURE FUSE
JCONV. THERMAL CUT-OUT
KCONVECTION HEATER
LTHERMISTOR
MDAMPER MOTOR
NDAMPER SWITCH
POUTER CASE SWITCH
QTOUCH CONTROL PANEL
RKEY UNIT
SRELAY RY-1
SRELAY RY-2
SRELAY RY-3
SRELAY RY-4
SRELAY RY-5
SRELAY RY-6
UFOIL PATERN ON PWB.
VAH SENSOR
Replace OVEN LAMP OR SOCKET
Replace FAN MOTOR
Replace TURNTABLE MOTOR
Replace CONVECTION MOTOR
Check LOOSE WIRING
Check SHORTED IN POWER CORD
Check NO POWER AT OUTLET
Check LOW VOLTAGE
PROBLEM
Home fuse blows when power cord is plugged into wall receptacle.
OFF CONDITION
Monitor fuse blows when power cord is plugged into wall receptacle
88:88 does not appear in display when power cord is first plugged into
wall receptacle.
Display does not operate properly when STOP/CLEAR pad is touched.
COOKING CONDITION
(The time of day should appear on the display with beep sound.)
Oven lamp does not light with door opened.
Oven lamp does not light in cook cycle. (It light when door is opened).
Cooking cycle runs 1 minute then shuts down.
Oven lamp light, but turntable motor does not operate.
Turntable motor operates normally but cooling fan motor does not
operate.
(MICROWAVE)(CONVECTION)
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.
Function of COMPU DEFROST does not operate properly.
(SENSOR
COOKING)
CONV indicator lights, but oven does not go into cook cycle when
START pad is touched.
CONV indicator lights, but heating element does not heat.
Temperature in the oven cavity is lower or higher than preset.
Cooling fan motor runs intermittently or all the time.
Convection cycle runs 4 minutes and 15 seconds then shuts down.
Oven in the sensor cooking condition but AH sensor does not end or AH
sensor turns off about max. 30 min. after start.
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PROCEDURE
LETTER
AMAGNETRON ASSEMBLY TEST
TEST PROCEDURES
COMPONENT TEST
HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD
BE OBSERVED.
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS
OR WIRING.
To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across
the magnetron filament leads should indicate less than 1 ohm.
To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and
chassis ground. This test should indicate an infinite resistance. If there is little or no resistance the
magnetron is grounded and must be replaced.
Power output of the magnetron can be measured by performing a water temperature rise test. This test
should only be used if above tests do not indicate a faulty magnetron and there is no defect in the following
components or wiring: silicon rectifier, high voltage capacitor and power transformer. This test will require
a 16 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple type
temperature tester. For accurate results, the following procedure must be followed carefully:
1. Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water with
a thermometer or thermocouple temperature tester. Stir the thermometer or thermocouple through
the water until the temperature stabilizes. Record the temperature of the water.
2. Place the cup of water in the oven. Operate oven at POWER HI(HIGH) selecting more than 60
seconds cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second hand
of a watch or the digital read-out countdown.
3. Remove the cup from the oven and again measure the temperature, making sure to stir the
thermometer or thermocouple through the water until the maximum temperature is recorded.
4. Subtract the cold water temperature from the hot water temperature. The normal result should be 22
to 43˚F(12.2 to 23.8˚C) rise in temperature. If the water temperatures are accurately measured and
tested for the required time period the test results will indicate if the magnetron tube has low power
output (low rise in water temperature) which would extend cooking time or high power output (high
rise in water temperature) which would reduce cooking time. Because cooking time can be adjusted
to compensate for power output, the magnetron tube assembly should be replaced only if the water
temperature rise test indicates a power output well beyond the normal limits. The test is only accurate
if the power supply line voltage is 120 volts and the oven cavity is clean.
BPOWER TRANSFORMER TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS
OR WIRING.
Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter.
Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil
should be less than 1 ohm and the resistance of the high voltage coil should be approximately 84.4 ohms;
the resistance of the filament coil should be less than 1 ohm.
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)
CHIGH VOLTAGE RECTIFIER TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS
OR WIRING.
Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across
the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading. If a
short is indicated in both directions, or if an infinite resistance is read in both directions, the rectifier is
probably defective and should be replaced.
DHIGH VOLTAGE CAPACITOR TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS
OR WIRING.
14
TEST PROCEDURES
PROCEDURE
LETTER
If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and
check for short or open between the terminals using an ohmmeter.
Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate continuity
for a short time and should indicate approximately 10 MΩ once the capacitor is charged. If the above is
not the case, check the capacitor with an ohmmeter to see if it is shorted between either of the terminals
and case. If it is shorted, replace the capacitor.
ESECONDARY INTERLOCK SWITCH TEST
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicated an open circuit with the door open and a closed circuit with the
door closed. If improper operation is indicated, replace the secondary interlock switch.
FPRIMARY INTERLOCK SYSTEM TEST
DOOR SENSING SWITCH
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch, the meter should indicated an open circuit with the door open and a closed circuit with the
door closed. If improper operation is indicated, replace the door sensing switch.
PRIMARY INTERLOCK RELAY
Disconnect two (2) wire leads from the common (COM.) and normally open (NO) terminal of the primary
Interlock relay (RY2). Check the state of the relay contacts using a ohmmeter. The relay contacts should
be open. If the relay contacts are closed, replace the relay itself.
COMPONENT TEST
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GMONITOR SWITCH
Disconnect the oven from power supply.
Before performing this test, make sure that the secondary interlock switch and the primary interlock relay
are operating properly, according to the above Test Procedures. Disconnect the wire lead from the
monitor switch (NC) terminal. Check the monitor switch operation by using the ohmmeter as follows.
When the door is open, the meter should indicate a closed circuit. When the monitor switch actuator is
pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the door
opened (in this condition the plunger of
the monitor switch is pushed in), the
meter should indicate an open circuit.
If improper operation is indicated, the
switch may be defective. After testing
the monitor switch, re-connect the wire
lead to the monitor switch (NC) terminal and check for continuity of monitor
circuit.
HBLOWN MONITOR FUSE
If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary
interlock switch, door sensing switch and monitor switch according to the "TEST PROCEDURE" for
those switches before replacing the blown monitor fuse.
CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK
RELAY, SECONDARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND MONITOR
SWITCH FOR PROPER OPERATION.
If the monitor fuse is blown by improper switch operation, the monitor fuse and switch must be replaced
with "monitor fuse and switch assembly" part number FFS-BA012WRK0, even if the monitor switch
operates normally. The monitor fuse and switch assembly is packed with 20 ampere fuse and switch.
SCREW DRIVER
N.C.
MONITOR SWITCH
COM.
SECONDARY
INTERLOCK
SWITCH
OHMMETER
ITEMPERATURE FUSE TEST
A continuity check across the temperature fuse terminals should indicate a closed circuit unless the
temperature of the magnetron reaches approximately 302˚F (150˚C). If the temperature fuse has
opened, replace the temperature fuse.
15
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PROCEDURE
LETTER
JTHERMAL CUT-OUT TEST
KHEATING ELEMENT TEST
TEST PROCEDURES
COMPONENT TEST
An open temperature fuse indicates overheating of the magnetron assembly, check for restricted air flow
to the magnetron through the opening in the chassis, especially the cooling duct and cooling fan.
A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the
temperature of thermal cut-out reaches 302˚F(150˚C). The thermal cut-out resets automatically at
approximately 266˚F(130˚C). If the thermal cut-out has opened under the normal condition,
replace the same item as in the parts list. An open thermal cut-out indicates overheating of heater
unit.
Check for restricted air flow to the heater unit through the vent hole of the oven cavity, especially the
heater duct and convection fan.
Make sure the heating element is fully cooled and test as follows;
a. Disconnect wire leads and measure the resistance with an ohmmeter. On the R x 1 scale, the
resistance between the heating element terminals should be approximately 10.2Ω.
b. Disconnect wire leads and measure the insulation resistance with 500V - 100MΩ insulation
resistance meter. The insulation resistance between heating element terminal and cavity should be
more than 0.5MΩ.
LTHERMISTOR TEST
Disconnect connector-E from the control unit. Measure the resistance of the thermistor with an
ohmmeter. Connect the ohmmeter leads to Pin No’s E-3 and E-4.
If the meter does not indicate above resistance, replace the thermistor
MDAMPER MOTOR TEST
When the power cord is plugged into the wall receptacle and 120 volts A.C. is supplied to the damper
motor, the motor operates until the damper is opened and the damper switch closes. Then the damper
motor stops operation.
If the damper motor does not operate, check for A.C. voltage with a voltmeter at the motor.
1. Disconnect the power cord from the wall receptacle.
2. Disconnect the wire leads of motor and connect the meter leads to the wire leads of main wire harness.
3. Re-connect the power cord into the wall receptacle.
If 120 volts A.C. is indicated at the wire leads, replace the motor and if 120 volts A.C. is not indicated,
check the wire harness and control unit.
NDAMPER SWITCH TEST
Disconnect the wire leads from the switch terminals and connect ohmmeter leads to the common (COM.)
and normally open (N.O.) terminals of the switch.
1. When switch actuator is pushed by the damper motor cam, the meter should be indicated a closed
circuit.
2. When power cord is plugged into the wall receptacle, the damper motor operates and damper cam
will start to rotate. When the switch actuator is released, the meter should be indicated an open circuit.
If improper operation is indicated, replace the damper switch.
OCHECKING TEMPERATURE IN THE CONVECTION MODE
It is difficult to measure the exact temperature in the convection oven. An accurate thermocouple type
temperature tester must be used. A low priced bi-metal type thermometer is not reliable or accurate.
The temperature should be checked with outer case cabinet installed, approx. 5 minutes after preheat
16
TEST PROCEDURES
PROCEDURE
LETTER
temperature is reached (audible signal sounds four times). The temperature experienced may be
approx. 30˚F more or less than indicated on the display, however, in most cases the food cooking results
will be satisfactory.
Difference in power supply voltage will also affect the oven temperature. The Household power supply
voltage may sometimes become lower than the rated voltage (120 V) and cause under-cooking. If the
power supply voltage is 10% lower than the rated voltage, longer cooking time is required by 10% to 20%.
POUTER CASE SWITCH TEST
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicated an open circuit when its plunger is release, and a closed circuit
when its plunger is pushed. If improper operation is indicated, replace the outer case switch.
QTOUCH CONTROL PANEL ASSEMBLY TEST
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. Replace the 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) All digits in the figure 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.
Note: When defective components, the Control Unit or Key Unit are replaced, the defective part or parts
must be properly packed for return in the shipping carton, with its cushion material, in which the
new replacement part was shipped to you.
COMPONENT TEST
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RKEY UNIT TEST
If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable 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 cable 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
connecter). 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.
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PROCEDURE
LETTER
TEST PROCEDURES
COMPONENT TEST
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 a 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 5G 6G 7G 8G 9G10G11G12
SRELAY TEST
Remove the outer case and check voltage between Pin Nos. 7 and 9 of the 9- pin connector (A) on the
control unit an A.C. voltmeter. The meter should indicate 120 volts, if not check the oven circuitry.
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
RY1Approx. 19.0V D.C.Oven lamp / Turntable motor
RY2(COOK)Approx. 18.0V D.C.Power transformer
RY3(HEATER)Approx. 18.0V D.C.Heating element
RY4Approx. 19.0V D.C.Damper motor
RY5Approx. 19.0V D.C.Convection motor
RY6Approx. 19.0V D.C.Cooling fan motor
G 4
G 3
G 2
G 1
MINUTE
PLUS
POPCORN
SENSOR
REHEAT
CUSTOM
HELP
SLOW
COOK
SENSOR
COOK
CONVEC
LOW MIX
BAKE
COMPU
DEFROST
PREHEAT
unit is defective.
COMPU
BROIL
COMPU
ROAST
COMPU
BAKE
BROIL
HIGH MIX
ROAST
12345
100˚F150˚F275˚F300˚F325˚F
67890
350˚F375˚C400˚F425˚F450˚F
KITCHEN
TIMER
POWER
LEVEL
CLOCK
START
TOUCH ON
STOP
CLEAR
TCOMPU DEFROST TEST
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the "COMPU DEFROST" pad twice and touch the Number pad "5". And then touch
the "START" pad.
(3) After 2 sec. Now the oven is in COMPU DEFROST cooking condition.
(4) The oven will operate as follows.
WEIGHT1ST STAGE2ND STAGE3RD STAGE4TH STAGE
LEVELTIMELEVELTIMELEVELTIMELEVELTIME
0.5lbs70%47sec.0%52sec.50%32sec.30%40sec.
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
UPROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
(PWB) IS OPEN.
o 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.
18
PROCEDURE
LETTER
TEST PROCEDURES
COMPONENT TEST
Problem: POWER ON, indicator does not light up.
STEPSOCCURRENCECAUSE OR CORRECTION
1The rated voltage is not applied to POWERCheck supply voltage and oven power cord.
terminal of CPU connector (CN-A).
2The rated voltage is applied to primary sidePower transformer or secondary circuit defective.
of power transformer.Check and repair.
3Only pattern at "a" is broken.*Insert jumper wire J1 and solder.
4Pattern at "a" and "b" are broken.*Insert the coil RCILF2003YAZZ between "c" and "d".
CONV M FAN MPOWER
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 the primary coil resistance which is approximately 175Ω± 10%). If
any abnormal condition is detected, replace
the defective parts.
357 9
CN - A
26
d
b
(J1)
a
c
VRS1
T1
3
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P
VAH SENSOR TEST
Checking the initial sensor cooking condition
(1) The oven should be plugged in at least two minutes before sensor cooking.
(2) Room temperature should not exceed 95˚F (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 vapour given of by the spray and turn off before food is properly cooked.
(8) After 30 minutes if the sensor has not detected the vapour 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 SENSOR COOK pad and number pad 1. Now, the oven is in the sensor cooking condition and
"BAKED POTATO" will appear in the display.
(5) Touch Start pad. 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
NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during first stage of
sensor cooking.
(6) After approximately 16 seconds, microwave energy is produced, and the display should start to count
down the remaining cooking time and oven should turn off after water is boiling (bubbling).
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.
(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 SENSOR COOK pad and number 1 pad.
6-5. Touch Start pad. The control panel is in automatic Sensor operation.
6-6. The display will start to count down the remaining cooking time, and the oven will turn off
automatically after the water is boiling (bubbling).
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 SENSOR COOK pad and number 1 pad.
6-2. Touch Start pad. The control panel is in the sensor cooking operation.
6-3. After approximately 20 seconds, push plunger of select switch for more than 3 seconds. This
conditionis same as judgement by AH sensor.
6-4. After approximately 3 seconds, the display shows " X X . X X " which is the remaining cooking
time, and the display count down.
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective.
Plunger
NC
NO
COM
F-1
F-2
F-3
To connector (F)
on Control Unit.
CONNECTOR
R1,R2 : 22Ω± 1% 1/2W
R3 : 4.3kΩ± 5% 1/4W
R4 : 1MΩ± 5% 1/4W
1
2
3
R1
R2
R3R4
COM
NO
NC
Sensor Dummy Resistor Circuit
20
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
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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 P10 - P17
generated in the LSI are sent to the key unit.
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 voltages 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.
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
THERMISTOR)
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 8-digits, 16-segments are
used for displaying figures.
21
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DESCRIPTION OF LSI
LSI(IZA797DR):
The I/O signals of the LSI(IZA797DR) are detailed in the following table.
Pin No.SignalI/ODescription
1VCCINConnected to GND.
2VEEINAnode (segment) of Fluorescent Display light-up voltage: -30V.
Vp voltage of power source circuit input.
3AVSSINPower source voltage: -5V.
VC voltage of power source circuit input.
4VREFINReference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V)
5AN7INUsed 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
converter built into the LSI.
6AN6INAH 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.
7-9AN5-AN3INHeating constant compensation terminal.
10AN2INInput signal which communicates the door open/close information to LSI.
Door closed; "H" level signal(0V).
Door opened; "L" level signal(-5V).
11AN1INInput signal which communicates the damper open/close information to LSI.
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.
13P55OUTDigit selection signal.
The relationship between digit signal and digit are as follows;
Digit signalDigit
P03........................... 1st.
P02.......................... 2nd.
P01...........................3rd.
P00........................... 4th.
P37........................... 5th.
P36.......................... 6th.
P35.......................... 7th.
P55.......................... 8th.
Normally, one pulse is output in every ß
period, and input to the grid of the Fluorescent Display.
14P54OUTOven lamp and turntable motor driving signal. (Square Waveform : 60Hz)
To turn on and off the shut-off relay(RY1).
The square waveform voltage is delivered to
the relay(RY1) driving circuit.
ß(60Hz)
P03
P02
P01
P00
P37
P36
P35
P55
GND
VP
16.7 msec.
During cooking
H
L
H
L
15P53OUTConvection motor driving signal.
To turn on and off shut-off relay(RY5). "L"
level during CONVECTION; "H" level otherwise.
16P52OUTCooling fan motor driving signal.
To turn on and off shut-off relay(RY6). "L"
level during both microwave and convection
cooking; "H" level otherwise.
22
ON
ON
During
cooking
(Convection)
During
cooking
OFF
OFF
H.
GND
L
H.
GND
L
Pin No.SignalI/ODescription
16.7 msec.
H : GND
L (-5V)
17P51OUTMagnetron high-voltage circuit driving
signal.
To turn on and off the cook relay(RY2). In
P-HI operation, the signals holds "L" level
during microwave cooking and "H" level
while not cooking. In other cooking modes
(P-90, P-80, P-70, P-60, P-60, P-50, P-40,
P-30, P-20, P-10, P-0) the signal turns to
"H" level and "L" level in repetition according to the power level.
VARI MODEON TIMEOFF TIME
P-HI (100% power)32 sec.0 sec.
P-90 (approx. 90% power)30 sec.2 sec.
P-80 (approx. 80% power)26 sec.6 sec.
P-70 (approx. 70% power)24 sec.8 sec.
P-60 (approx. 60% power)22 sec.10 sec.
P-50 (approx. 50% power)18 sec.14 sec.
P-40 (approx. 40% power)16 sec.16 sec.
P-30 (approx. 30% power)12 sec.20 sec.
P-20 (approx. 20% power)8 sec.24 sec.
P-10 (approx. 10% power)6 sec.26 sec.
P-0 (0% power)0 sec.32 sec.
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18P50OUTDamper motor relay driving signal.
To turn on and off shut-off relay(RY4).
OFF
ON
H : GND
L
19P47OUTHeating element driving signal.
To turn on and off shut-off relay(RY3). "L" level during
convection cooking; "H" level otherwise. During convection cooking, the signal becomes "H" level when
the temperature of the oven cavity exceeds the
ON
During
cooking
(Convection)
OFF
H.
GND
L
predetermined temperature.
20-21P46-P45OUTTerminal not used.
22P44OUTTiming signal output terminal for temperature measurement(OVEN THERMIS-
TOR).
"H" level (GND) : Thermistor OPEN timing.
"L" level (-5V) : Temperature measuring timing.(Convection cooking)
A
B
1.0 sec
C
0.1 sec
2.0 sec
1.0 sec
H: GND
L
23P43OUTSignal to sound buzzer.
A: key touch sound.
B: Completion sound.
C: When the temperature of the oven cavity
reaches the preset temperature in the
preheating mode, or when the preheating
hold time (30 minutes) is elapsed.
24P42OUTTiming signal output terminal for temperature measurement(OVEN).
"H" level (GND) : Ttermistor OPEN timing.
"L" level (-5V) : Temperature measuring timing.(Convection cooking)
25INT1INSignal to synchronize LSI with commercial power source freqency.
This is the basic timing for all real time
processing of LSI.
26P40INConnected to GND.
27RSTINAuto 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.
28/29XCIN/XCOUTOUTTerminal not used.
30XININInternal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
31XOUTOUTInternal clock oscillation frequency control output.
Output to control oscillation input of XIN.
32VSSINPower source voltage: -5V.
VC voltage of power source circuit input.
33P27INSignal coming from touch key.
When any one of G-1 line keys on key matrix is touched, a corresponding signal from
P17 - P17 will be input into P27. When no key is touched, the signal is held at "L" level.
23
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Pin No.SignalI/ODescription
34P26INSignal similar to P27.
When any one of G-2 line key on key matrix is touched, a corresponding signal will be
input into P26.
35P25INSignal similar to P27.
When any one of G-3 line key on key matrix is touched, a corresponding signal will be
input into P25.
36P24INSignal similar to P27.
When any one of G-4 line key on key matrix is touched, a corresponding signal will be
input into P24.
37P23OUTSegment data signals.
The relation between signals and indicators are as follows:
Signal SegmentSignal SegmentSignal SegmentSignal Segment
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.
42P16OUTSegment 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.
43P15OUTSegment 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.
44P14OUTSegment 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.
45P13OUTSegment 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-8 line keys on key matrix is touched.
46P12OUTSegment 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-7 line keys on key matrix is touched.
47P11OUTSegment 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.
24
Pin No.SignalI/ODescription
48P10OUTSegment 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-5 line keys on key matrix is touched.
49-53P07-P03OUTSegment data signal.
Signal similar to P23.
54-56P02-P00OUTDigit selection signal.
Signal similar to P55.
57-59P37-P35OUTDigit selection signal.
Signal similar to P55.
60-64P34-P30OUTUsed for initial balancing of the bridge circuit (absolute humidity sensor).
ABSOLUTE HUMIDITY SENSOR CIRCUIT
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(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.
Sensing part
(Closed vessel)
Cross section view
Thermistor
element
Sensor
case
Ventilation
openings
View of sensor case removed
Sensing part
(Open vessel)
Sensing part
(Closed vessel)
Sensing part
(Open vessel)
Thermistor
element
(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 (302˚F), 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.
Absolute humidity vs,
R1
R2
Operational
amplifier
+
S : Thermistor
open vessel
C : Thermistor
closed vessel
Output
voltage
Output voltage
C
S
R3
output voltage characterist
Absolute humidity (g/m )
2
(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
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
C. Thermistor in
closed vesssl
S. Thermistor in
open vessel
F-1
C
F-3
3.57k
S
F-2
VA : -15V
11
3.32k
10
R51
IC2(IZA495DR)
620k
300k
150k
75k
37.4k
47k
+
0.1
µF
-
1.8k
9
VA : -15V
360k
12
4
5
6
7
8
3
0.01µF
0.015µF
0.01µF
10k
VC : -5V
2
47k
1
SW1
64
P30
SW2
63
P31
SW3
62
P32
SW4
61
P33
SW5
60
P34
5
AN7
LSI
(IC1)
6
AN6
25
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SERVICING
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.
approx. 1M ohm
2. Shapes of Electronic Components
B
C
Transistor
DTA123ES
KRA101M
KRA223M
KRC243M
B
C
E
Transistor
2SB910M
E
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.
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 aluminum 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 aluminum 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.
26
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE.
DISCHARGE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING
AFTER REMOVING OUTER CASE.
WARNING FOR WIRING
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To prevent an electric shock, take the following manners.
1. Before wiring,
1) Disconnect the power supply.
2) Open the door and wedge the door open.
3) Discharge the high voltage capacitor and wait for 60
seconds.
2. Don’t let the wire leads touch to the followiong parts;
1) High voltage parts:
Magnetron, High voltage transformer, High voltage
capacitor and High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, High voltage transformer
and Oven cavity.
OUTER CASE REMOVAL
To remove the components, procedure as follows.
1. Disconnect oven from power supply.
2. Remove screws from rear and along the side edge of
case.
3. Slide the entire case back out about 1 inch (3 cm) to free
OUTER CASE SWITCHES REPLACEMENT
Removal
1. Disconnect the oven from the power supply and remove
the outer case.
2. Discharge high voltage capacitor.
3. Remove the one (1) screw holding the switch holder to
the oven cavity rear plate.
4. Release the one (1) tab of the switch holder from the one
(1) hole of the oven cavity plate.
5. Disconnect the wire leads from the outer case switches.
6. Remove the switch holder (outer case switch assembly)
from the oven cavity rear plate.
7. Push on the one (1) retaining tab holding the outer case
switch.
8. Turn the outer case switch clockwise around the pole.
9. Now, the outer case switch is free.
NOTE: Do not lose the actuator because it will be loose after
the outer case switches are removed.
Re-install
1. Re-install the actuator to the switch holder by inserting
the tab of the actuator into the square hole on the switch
holder, as shown in Figure C-1.
2. Re-install the outer case switches to the switch holder,
as shown in Figure C-1.
3) Sharp edge:
Bottom plate, Oven cavity, Weveguide flange,
Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Switch lever, Open
button.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector certainly until its pin
is locked. And make sure that the wire leads should not
come off even if the wire leads is pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
it from retaining clips on the cavity face plate.
4. Lift entire case from the unit.
CAUTION: DISCONNECT OVEN FROM POWER SUP-
PLY BEFORE REMOVING OUTER CASE.
3. Re-connect the wire leads to the outer case switches,
referring to the Pictorial diagram.
4. Re-install the one (1) snap of the main wire harness to
the hole of the switch holder.
5. Catch the one (1) tab of the switch holder to the one (1)
hole of the oven cavity rear plate.
6. Re-install the switch holder (outer case switch assembly)
to the oven cavity rear plate with the one (1) screw.
7. Re-install the outer case cabinet and check that the oven
is operating properly.
Outer case
switch
Actuator
Switch
holder
Outer case
switch
Figure C-1. Outer case switches replacement
POWER TRANSFORMER REMOVAL
1. Disconnect oven from power supply and remove outer
case.
2. Discharge high voltage capacitor.
3. Disconnect filament leads of transformer from the
magnetron and capacitor.
4. Disconnect high voltage lead of capacitor from the
27
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Terminal
Push
Pull down
1
2
Lever
Positive lock®
connector
R-930AW
transformer.
5. Disconnect wire leads from the transformer.
6. Remove two (2) screws holding the transformer to the
base cabinet.
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.
3. Make sure the transformer is mounted correctly to the
corners underneath those tabs.
4. After re-installing the transformer, secure the transformer
MAGNETRON REMOVAL
1. Disconnect oven from power supply and remove outer
case.
2. Discharge the high voltage capacitor. Disconnect filament
lead of transformer from magnetron. Disconnect high
voltage wire lead from magnetron.
3. Carefully remove four (4) mounting screws hold the
magnetron to waveguide, when removing the screws
holding the magnetron to prevent it from falling.
HIGH VOLTAGE RECTIFIER ASSEMBLY REMOVAL
with two screws to the base cabinet, one is with outer
tooth 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 HOT (ORANGE) WIRE MUST BE CONNECTED
TO THE POWER TRANSFORMER TERMINAL
NEAREST TO THE TRANSFORMER MOUNTING
SCREW.
4. Remove the magnetron from the unit with care so the
magnetron tube should not hit by any metal object
around the tube.
CAUTION: WHEN REPLACING THE MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND
THE MAGNETRON MOUNTING SCREWS
ARE TIGHTENED SECURELY.
1. Disconnect oven from power supply and remove outer
case.
2. Discharge the high voltage capacitor.
3. Remove one (1) screw holding the rectifier assembly to
the capacitor holder.
4. Disconnect the rectifier assembly from the capacitor and
HIGH VOLTAGE CAPACITOR REMOVAL
1. Disconnect oven from power supply and remove outer
case.
2. Discharge the high voltage capacitor.
3. Disconnect the high voltage wire leads and rectifier
assembly from high voltage capacitor and magnetron.
4. Disconnect filament lead of transformer from high voltage
capacitor.
POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL
Push the lever of positive lock® connector. Pull down on the
positive lock® connector.
CAUTION: WHEN YOU CONNECTING THE POSITIVE
LOCK® CONNECTORS TO THE TERMINALS,
INSTALL THE POSITIVE LOCK® SO THAT
THE LEVER FACES YOU.
magnetron.
CAUTION: WHEN REPLACING THE SILICON RECTIFIER
ASSEMBLY, THE GROUND SIDE TERMINAL
MUST BE SECURED FIRMLY WITH A
GROUNDING SCREW.
5. Disconnect high voltage wire lead of capacitor from
transformer.
6. Remove one (1) screw and washer holding the rectifier
from the capacitor holder.
7. Remove one (1) screw holding the capacitor holder to
the rear cabinet.
8. Remove the capacitor from the holder.
Figure C-2. Positive lock®connector
1.
Disconnect oven from power supply and remove outer case.
2. Discharge the high voltage capacitor.
3. Disconnect wire leads from the convection motor.
Remove the convection fan belt.
CONVECTION MOTOR REMOVAL
4. Remove two (2) screws holding the convection motor
mounting angle to the heater duct and base cabinet.
5. Take out the convection motor assembly from the unit.
The convection motor assembly is now free.
6. Remove two (2) screws and nuts holding the motor to
mounting angle.
7. Remove pulley (M) from the motor shaft. Convection
motor is now free.
28
TURNTABLE MOTOR REMOVAL
Long nose plier
Heating element
holder
Heating
element
Oven lamp
socket
Terminal
Wire lead
Terminal hole
Flate type small
screw driver
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1. Disconnect the oven from power supply.
Remove the turntable tray, and the turntable support out
of the oven cavity.
2. Turn the oven upside down and remove one (1) screw
holding the turntable motor cover to the base plate and
take off the turntable motor cover.
DAMPER ASSEMBLY REMOVAL
1. Disconnect oven from power supply and remove outer
case.
2. Discharge the high voltage capacitor.
3. Disconnect wire leads from damper motor and damper
switch.
4. Remove two (2) oven side screws holding damper motor
1. Disconnect oven from power supply and remove outer
case cabinet.
2. Discharge the high voltage capacitor.
Disconnect wire leads from H.V. capacitor and remove
four (4) screws holding rear cabinet to bottom plate and
three (3) screws holding to heater unit assembly and two
(2) screws holding steam duct to top of oven cavity.
Disconnect wire leads from power supply cord terminals.
3. Disconnect wire leads from thermistor. Remove two (2)
screws from thremistor.
4. Disconnect wire leads from convection motor, thermal
cut-out and heater element.
5. Remove nine (9) screws holding heater duct to the oven
cavity.
6. Remove two (2) screws holding heater duct to base
cabinet. Release two (2) snap bands holding wire harness
to the thermal cover (convection).
7. The heater unit is now free.
3. Disconnect wire lead from the turntable motor.
4. Remove the two (2) screws holding the turntable motor
and coupling mounting plate to the oven cavity bottom.
5. Turntable motor, Coupling mounting plate and Thermal
protection plate bottom will be free.
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.
HEATING ELEMENT REMOVAL
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.
NOTE: After installed the heating element completely,
bent top of the heating element holder to inside
using by long nose pliers as shown following
illustration.
OVEN LAMP AND LAMP SOCKET REMOVAL
1. Disconnect oven from power supply and remove outer
case.
2. Discharge high voltage capacitor.
3. Bend the tab of the air guide holding the lamp socket.
4. Lift up the oven lamp socket.
5. Pull the wire leads from the oven lamp socket by pushing
the terminal hole of the oven lamp socket with the small
flat type screw driver.
6. Now, the oven lamp socket is free.
1. Disconnect oven from power supply and remove outer
case.
2. Discharge high voltage capacitor.
3. Disconnect the wire leads from the fan motor.
4. Remove one (1) screw holding the fan motor grounding
wire to the air guide (Right).
FAN MOTOR REMOVAL
Figure C-3. Oven lamp socket
5. Remove three (3) screws holding the chassis support to
the rear cabinet, waveguide and control panel back
plate.
6. Remove the chassis support from the oven.
7. Remove one (1) screw holding the magnetron air guide
to the waveguide.
29
R-930AK
R-930AW
8. Remove the magnetron air guide from the waveguide.
9. Disconnect wire leads from the fan motor.
10. Release the main harness from the hole of the fan duct.
11. Release the thermistor harness from the hole of the fan
duct.
12. Release one (1) tab holding the fan duct to the rear
cabinet.
13. Release one (1) tab holding the fan duct to the air guide
(Right).
14.Remove the fan duct assembly from the oven.
15.Remove the fan blade 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 easily 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 disfigure the bracket by touching with the
pliers.
2) Remove the fan blade from the shaft of the fan motor by
pulling 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.
16.Remove the two (2) screws and nuts holding the fan
motor to the fan duct.
17.Now, the fan motor is free.
Coil
INSTALLATION
1. Install the fan motor to the fan duct with the two (2)
screws and nuts.
2. Install the fan blade 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 to the shaft of fan motor by pushing
the fan blade with a small, light weight, ball peen hammer
or rubber mallet.
CAUTION:
*Do not hit the fan blade strongly when installed
because the bracket may be disfigured.
*Make sure that the fan blade rotates smooth after
installation.
*Make sure that the axis of the shaft is not slanted.
3. Reset the fan duct assembly to its place.
4. Install the tabs of fan duct to the rear cabinet and air
guide.
5. Install the magnetron air guide with the one (1) screw.
6. Reinstall the main harness and thermistor harness to
each hole of the fan duct.
7. Reinstall the chassis support to the control panel back
plate, waveguide and rear cabinet with the three (3)
screws.
8. Re-connect the wire leads to the fan motor, referring to
the pictorial diagram.
9. Re-install the fan motor grounding wire to the air guide
(Right) with one (1) screw.
Shaft
Groove joint pliers
Side View
Rear View
Stator
Gap
Bracket
Axis
Rotor
CONTROL PANEL ASSEMBLY AND CONTROL UNIT REMOVAL
To remove the control panel, procedure as follows:
1. Disconnect oven from power supply and remove outer
case.
2. Discharge high voltage capacitor.
3. Disconnect connector CN-A, CN-E and CN-F from the
control unit.
4. Disconnect the wire leads from the relays RY1, RY2 and
RY3.
5. Remove one (1) screw holding the control panel back
plate to the chassis support.
6. Remove two (2) screws holding the bottom edge of the
back plate to the cabinet base.
7. Remove one (1) screw holding the back plate to the oven
cavity flange.
8. Lift up and pull the control panel assembly forward.
Replacement of individual component is as follows;
CONTROL UNIT AND KEY UNIT
1. Disconnect the wire connector from the control unit.
Table
Shaft
Stator
Rotor
These are the position
where should be
pinched with pliers
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 a 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 the
control panel frame.
3. Stick the key unit firmly to the control panel
frame by rubbing with soft cloth not to scratch.
Center of
bracket
30
R-930AK
DOOR SENSING
SWITCH
MONITOR FUSE
MONITOR SWITCH
SECONDARY
INTERLOCK
SWITCH
R-930AW
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL
1. Disconnect oven from power supply and remove outer
case.
2. Discharge high voltage capacitor.
3. Remove the control panel assembly, refer to "Control
Panel Removal".
4. Disconnect wire leads from each of the switches and
fuse holder.
5. Remove two (2) screws holding latch hook to oven
flange.
6. Remove latch hook assembly from oven flange.
7. Push outward on the one (1) stopper tabs holding each
of switches place.
At this time switch lever will be free, do not lose it.
Re-install
1. Re-install switch lever and each interlock switch in its
place. The secondary interlock switch is in the lower
position and the door sensing switch is in the upper
position and the monitor switch is in the middle position.
2. Re-connect wire leads to each switches and fuse holder.
Refer to pictorial diagram.
3. Secure latch hook (with two (2) mounting screws) to
oven flange.
4. Make sure that the monitor switch is operating properly
and check continuity of the monitor circuit. Refer to
chapter "Test Procedure" and Adjustment procedure.
8. Switch is now free.
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT
If the door sensing switch, secondary interlock switch and
monitor switch do not operate properly due to a
misadjustment, the following adjustment should be made.
1. Loosen the two (2) screws holding latch hook to the oven
cavity front flange.
2. With door closed, adjust latch hook by moving it back and
forth, and up and down. In and out play of the door
allowed by the latch hook should be less than 0.5mm.
3. Secure the screws with washers firmly.
After adjustment, check the following.
1. In and out play of door remains less than 0.5mm at the
latched position.
2. The door sensing switch and secondary interlock switch
interrupt the circuit before the door can be opened.
3. Monitor switch contacts close when door is opened.
4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
DOOR REPLACEMENT AND ADJUSTMENT
REMOVAL
1. Disconnect oven from power supply and remove the
outer case.
Remove turntable tray and turntable support from oven
cavity.
2. Remove three (3) screws holding lower oven hinge.
3. Remove the 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 the individual parts are replaced, refer to
6. On re-installing door, insert the upper oven hinge into the
door hinge pin. Then while holding door in place.
7. Make sure the door is parallel with oven face lines (left
and upper side lines) and door latch heads pass through
latch holes correctly.
8. Insert the lower oven hinge into oven cavity bottom
flange and then engaged the door hinge pin. Then
secure the lower oven hinge firmly with tree (3) mounting
screws.
"Door Disassembly".
Figure C-4. Latch Switch Adjustments
Note: After any service to the door;
(A) Make sure that door sensing switch and secondary
interlock switch 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 can be adjusted by keeping screws of each hinge
loose.
After adjustment, make sure of the following :
1. Door latch heads smoothly catch latch hook through
latch holes and that latch head goes through center of
latch hole.
2. Deviation of door alignment from horizontal line of cavity
face plate is to be less than 1.0mm.
3. Door is positioned with its face pressed toward cavity
face plate.
4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
31
R-930AK
R-930AW
Note:The door on a microwave oven is designed to act as
an electronic seal preventing the leakage of
microwave energy from oven cavity during cook
cycle. This function does not require that door be
airtight, moisture (condensation)-tight or light-tight.
Therefore, occasional appearance of moisture, light
or sensing of gentle warm air movement around
oven door is not abnormal and do not of themselves
indicate a leakage of microwave energy from 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 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-6 to free engaging parts.
3. Lift up choke cover.
4. Now choke cover is free from door panel.
UPPER OVEN HINGE
RE-INSTALL
DOOR ASSEMBLY
LATCH
HEADS
LOWER OVEN HINGE
RE-INSTALL
Figure C-5. Door Replacement and adjustment
2 LIFT UP
1 BENT
CHOKE COVER
PUTTY KNIFE
Door
Panel
Upper
Bent
Figure C-6. Door Disassembly
INSIDE
FRONT
Choke
cover
Lower
32
R-930AK
R-930AW
1
A
HIGH VOLTAGE
RED
RED
BLK
B
HIGH VOLTAGE COMPONENTS
MAGNETRON
GRY
C
MAGNETRON
TEMPERATURE
FUSE
REDBLK
D
PNK
RED
GRY
WHT
BLUE MARK
2
CAPACITOR
POWER TRANSFORMER
NOTE:
Hot (ORG) wire must be connected to the
power transformer terminal nearest to the
transformer mounting screw.
GRY
T
H
W
ORG
DAMPER
N.O.
SWITCH
PNK
COOLING
COM
PNK
3
BLK
RED
OVEN
THERMAL
CUT-OUT
FAN
MOTOR
PPL
T
H
W
T
H
W
DAMPER
MOTOR
ORG
WHT
WHT
45
BRN
GRY
CONVECTION MOTOR
HEATING
ELEMENT
GRN
NOTE:
The grounding conductor of
the power supply cord has
been grounded by power
supply cord fixing screw.
The screw must be kept
GRY
GRY
RED
allways tight.
WHT
NH
PNK
N.O.
NOTE:
The neutral (WHT) wire
must be connected to
the terminal with "N"
COM
OUTER CASE
SWITCH
PNK
RED
THERMISTOR
PNK
GRY
6
POWER SUPPLY CORD
120V 60Hz
mark on the power
supply cord.
COM
(Oven side)
N.O.
RED
1
2
RED
RED
RED
WHT
OUTER CASE
GRY
SWITCH
A
B
(Cabinet side)
C
D
Figure S-1. Pictorial Diagram
OVEN LAMP
E
& SOCKET
GRN
GRN
F
N.O.
DOOR
SENSING
SWITCH
G
AH SENSOR
RED
BLK
WHT
CN-F
H
123
NOTE:
Hot (YLW & PNK) wire
must be connected to the
terminal with blue mark
on the oven light socket.
GRN
ORG
BLK
COM
MONITOR FUSE
& FUSE HOLDER
RED
IC-1
CONTROL PANEL
CN-G
GRY
MONITOR
SWITCH
PNK
CN-E
6
3
WHT
N.C.
PNK
1
ORG
RED
RED
CN-E
CN-F
COM
GRN
COM.
12345
5
ORG
BRN
RY3 (COM.)
362
4
RY3
N.O.
RED
BRN
RY3 (N.O.)
RY2 (COM.)
1
RY2
COM.
BRN
N.O.
ORG
COM.
BLK
ORG
RY1 (COM.)
RY2 (N.O.)
RY1
N.O.
RED
BRN
RY1 (N.O.)
RY5
RY4
BRN
PPL
RY6
CN-A
ORG
CN-A
123456789
T1
13579
TURNTABLE
MOTOR
WHT
N.O.
WHT
WHT
GRY
COM
E
GRY
F
SECONDARY
INTERLOCK
SWITCH
G
H
1
2
3
33
45
6
R-930AK
R-930AW
1
A
: IF NOT SPECIFIED. 0.01µ/16v
: IF NOT SPECIFIED. 1SS270A
B
NOTE : IF NOT SPECIFIED. 1/4w ± 5%
C
R11 18 1w
D
R10 18 1w
Q4
DTA123ES
E
CONTROL UNIT
/25v
22µ
+
–
C11
D7
F
D1-4 : 11ES1
7
G
8
T1
1
VRS1
D4
D1
5
3
10G471K
d
C6 10µ/35v
–
+
HZ5C2
ZD3
–
+
HZ16-1
ZD2
–
+
ba
A9
CLEAR
LEVEL
TIMER
HELP
KEY UNIT
C70 330pF x 4
D30
AH SENSOR
E1E2E5E6E3E4F1F2F3
6
A
B
C
D
OVEN
THERMISTOR
E
DAMPER
SWITCH
Figure S-2. Control Panel Circuit
DOOR
SWITCH
F
G
2
P1
4
P2
5
P3
6
7
P4
8
P5
P6 9
P7 10
P8 11
P9 12
P10
13
P11
15
P12
16
FLUORESCENT DISPLAY TUBE
MIX CONV
DEFROST
SENSOR
29
1, 2
31, 32
FF8G
Q90
(VP)
R90 100k
C10 0.1µ/50v
C7
R7 4.7k
C8
HZ4A2
ZD4
C5 0.1µ/50v
C4 10µ/35v
R4 750 1/2w
C3 0.1µ/50v
470 1/2w
Q1
2SB1238
R3 330 1/2w
R2
C2 1000µ/35v
C1 0.1µ/50v
D3
D2
4
(J1)
Q20
c
A7
KRA101M
R8 4.7k
Q3
KRA101M
R40 3.3k
SP40
KRA101M
Q21
KRA101M
D20D21D22D24
RY4
A1
COOK LBS OZ KG HELP
C9 0.01µ/50v
RY5
A3
P13
17
P14
18
P15
19
P16
20
1G 22
2G 23
3G 24
4G 25
5G 26
6G 27
7G 28
(VP)
12
IC2 IZA495DR
1
Q40
KRA101M
Q22
KRA101M
3
100k
R93
100k
R92
100k
R91
R100 330 1w
(C) (B) (A)
P30
P31
P32
P33
P34
P35
P36
64
60
AN7
AN6
AN5
VEE
VCC 1
VREF
AVSS
(J7)
(J5)
(J3)
(J6)
(J4)
(J2)
D23
RY6
A5
RY2
P37
AN4
P00
AN3
NO
P01
P02
55
10
AN2
AN1
Q24
KRA101M
P03
P04
P05
P55
P54
AN0
RY3
COM
45
3.3k
D77
R81
ROAST
D76
D75
3.3k
D74
R78
D73
D72
D71
D70
R64 2.2kF
KRA101M
Q26
KRC243M
G 5G 6G 7G 8G 9G10G11G12
R73 3.3k
R72 3.3k
R71 3.3k
R70 3.3k
C30C50C60
HIGH MIX
BROIL
BAKE
COMPU
ROAST
COMPU
BROIL
COMPU
COOK
SENSOR
COMPU
DEFROST
PLUS
MINUTE
G 4
CF1 4.19MHz
12345
CONVEC
PREHEAT
POPCORN
G 3
(A)(B)(C)
R62 75kF
R63 100F
R51 4.7k
R50 15k
R30 15k
P06
P07
P10
P11
P12
50
15
P53
P52
P51
P50
P47
Q25
KRA101M
D25D26
NO
P13
P14
45
20
P46
P45
COM
RY1
P15
P16
P44
P43
NO
P17
P20
P21
P22
P23
P24
P25
35
40
IC1 IZA797DR
25
30
XIN
P42
P40
RST
INT1
XCIN
XCOUT
C21 0.1µ/50v
+
–
C20 10µ/35v
–
+
COM
P26
XOUT
3.3k
R80
3.3k
R79
3.3k
R77
3.3k
R76
3.3k
R75
3.3k
R74
P27
3233
VSS
Q23
C22 0.1µ/50v
100˚F150˚F275˚F300˚F325˚F
R31 4.7k
67890
350˚F375˚C400˚F425˚F450˚F
BAKE
LOW MIX
SLOW
COOK
REHEAT
SENSOR
G 2
D31
STOP
START
TOUCH ON
CLOCK
POWER
KITCHEN
CUSTOM
G 1
H
AC120V
60Hz
1
DAMPER
MOTOR
CONV.
MOTOR
FAN
MOTOR
2
POWER
TRANSFORMER
HEATING
ELEMENT
3
34
OVEN LAMP
TURNTABLE
MOTOR
45
H
6
R-930AK
R-930AW
1
A
B
C
D
E
F
2
1
DIP
C70
1
(ONLY 9X58PJ)
(CN - G)
12
12
CN - G
CONV
COM
HEATER
RED BRN
POWER TRANS
RY3
ORG
RY2
PINK RED (BRN
RED)
OL TTM
RY1
POWER
BLK
25
DAMP M CONV M FAN M POWER
1357 9
3
RR
,F
BE
1
2
R91
R92
R93
57
8
10
11
12
(J7)
C30
(J5)
C50
(J3)
C60
13
(J2)
(J4)
(J6)
16
17
R30
R31
R4
R51
R50
C21
19
E
B
Q25
E
B
Q24
D23
B
R3
20
Q23
D26
E
E
22
C22C1
B
Q26
B
E
E
23
Q22
24
B
Q20
E
1
P
32
(R85)
C7
1
B
D70
D71
D72
D73
D74
D75
D76
D77
1
R74
R77
R76
R100
R79
R78
R75
IC2
3
CN - F
D25
D24
R80
R81
R73
R72
3364
R71
R70
IC1
12
1
1
18
D21
Q21
RY5
D20
RY4
VRS1
45
32
Q90
3
R90
C10
(C81)
R86(J8)
(ONLY
PHR)
(CF1)
CF1
(C80)
(R45)
R7
31
4
E
B
Q4
6
ZD4
(R47)
9
58
14
R40
E
R62
C4
E
B
ZD2
R2
21
D1
D3
D4
4578
(CN - D)
(R48)
14
15
C9
(R49)
(C46)
(C47)
IC3
CN - E
(C45)
ZD3
654321
SW
TEMP
SW
DAMP
OVEN
DOOR
C8
R8
E
B
Q3
R64
C5
C6
(R46)
B
Q40
R63
C3
D31
D30
Q1
C2
C20
D2
S1S2
6
A
B
C
D
E
F
G
H
1
CN - A
Figure S-3. Printed Wiring Board
2
(J1)
3
26
T1
D22
RY6
0
3
35
D7
C11
R10
R11
45
G
H
6
R-930AK
R-930AW
PARTS LIST
◊Refer to "MPORTANT" described at end of parts list.
7- 1XOTWW40P10000Screw; 4mm x 10mm14AA
7- 2XOTSE40P12000Screw; 4mm x 12mm [R-930AW]4AA
7- 2XOTSF40P12000Screw; 4mm x 12mm [R-930AK]4AA
7- 3XCTWW40P08000Screw; 4mm x 8mm2AA
7- 4XHTSD40P08RV0Screw; 4mm x 8mm1AA
7- 5LX-CZ0052WRE0Special screw2AA
7- 6XWVSD60-07000Washer; 6mm x 0.7 mm1AA
7- 7LX-WZA004WRE0Washer1AA
7- 8LX-CZA020WRE0Special screw6AA
7- 9XBPSD30P14K00Screw; 3mm x 14mm1AA
7-10XBPSD40P25000Screw; 4mm x 25mm2AA
7-11XBTWW40P06000Screw; 4mm x 6mm7AA
7-12XCTSD40P08000Screw; 4mm x 8mm7AA
7-13XCPSD40P10000Screw; 4mm x 10mm1AA
7-14XBPSD40P06KS0Screw; 4mm x 6mm2AA
7-15LX-WZA022WRE0Washer1AB
7-16XCPSD40P08000Screw; 4mm x 8mm6AA
7-17XCPSD30P06000Screw; 3mm x 6mm3AA
7-18LX-CZA038WRE0Special screw1AA
7-19XFPSD40P08K00Screw; 4mm x 8mm2AA
7-20XHTSD40R12RV0Screw; 4mm x 12mm1AA
7-21XCBWW30P06000Screw; 3mm x 6mm4AA
7-22XFPSD40P08000Screw; 4mm x 8mm6AA
7-23XFPSD60P14JS0Screw; 6mm x 14mm2AB
38
R-930AK
R-930AW
REF. NO.PART NO.DESCRIPTIONQ'TYCODE
7-24XOTSD40P12000Screw; 4mm x 12mm22AA
7-25XFPSD30P08000Screw; 3mm x 8mm2AA
7-26XNESD40-32000Nut; 4mm x 3.2mm2AA
7-27XNEUW40-32000Nut; 4mm x 3.2mm1AA
7-28XWSUW40-10000Washer; 4mm x 1 mm1AA
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER3. PART NO.
2. REF. NO.4. DESCRIPTION
Order Parts from the authrized SHARP parts Distributor for your area.
Defective parts required return should be returned as indicated in the Service Policy.