R-930AK
R-930AW
SERVICE MANUAL
S6710R930APW/
CONVECTION
MICROWAVE OVEN
MIX CONV
DEFROST
SENSOR
COOK LBS
OZ
Interactive
KG
HELP
CUSTOM
HELP
SENSOR
REHEAT
MINUTE
PLUS
POPCORN
COMPU
DEFROST
ELEVATE PKG
1 Baked potatoes
2 Frozen vegetables
3 Fresh veg-soft
4 Fresh veg-hard
5 Frozen entrees
6 Hot dogs
7 Bacon
8 Fish, seafood
SENSOR
COOKT
Convection
1 Hamburgers
2 Chicken pieces
3 Steaks
4 Fish steaks
COMPU
BROIL
1 Chicken
2 Turkey
3 Turkey breast
4 Pork
COMPU
ROAST
1 Bundt cake
2 Cookies
3 Muffins
4 French fries
PREHEAT
SLOW
COOK
1
100˚F
6
350˚F
BROIL
LOW MIX HIGH MIX
BAKE
ROAST
2
150˚F
7
375˚F
KITCHEN
TIMER
POWER
LEVEL
SMART & EASY
COMPU
BAKE
CONVEC
3
4
275˚F
8
400˚F
325˚F
9
0
425˚F
CLOCK
MODELS
5
300˚F
150˚F
ST OP
TCLEAR
START
TOUCH ON
CONVECTION
R-930AW
R-930AK
R-930AW
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
MICROWAVE MEASUREMENT PROCEDURE ................................................................................................... 2
FOREWORD .......................................................................................................................................................... 3
PRODUCT SPECIFICATIONS .............................................................................................................................. 4
GENERAL INFORMATION ................................................................................................................................... 4
OPERATION .......................................................................................................................................................... 6
TROUBLESHOOTING GUIDE ............................................................................................................................ 13
TEST PROCEDURE ............................................................................................................................................ 14
TOUCH CONTROL PANEL ................................................................................................................................. 21
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 27
PICTORIAL DIAGRAM ........................................................................................................................................ 33
CONTROL PANEL CIRCUIT ............................................................................................................................... 34
PRINTED WIRING BOARD ................................................................................................................................. 35
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.
R-930AK
R-930AW
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.
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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
R-930AK
R-930AW
SERVICE MANUAL
PRODUCT DESCRIPTION
CONVECTION
MICROWAVE OVEN
GENERAL INFORMATION
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.
OPERATION
TROUBLESHOOTING GUIDE
AND TEST PROCEDURE
TOUCH CONTROL PANEL
COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
WIRING DIAGRAM
PARTS LIST
SHARP ELECTRONICS CORPORATION
SHARP PLAZA, MAHWAH,
NEW JERSEY 07430-2135
3
R-930AK
R-930AW
SPECIFICATION
ITEM
DESCRIPTION
Power Requirements
120 Volts
13.0 Amperes (Microwave) / 13.0 Amperes (Convection)
60 Hertz / Single phase, 3 wire grounded
Power Output
900 watts (IEC 705 Test Procedure)
Operating frequency of 2450MHz
1450 Watts
Convection Power Output
Case Dimensions
Cooking Cavity Dimensions
(1.5 Cubic Feet )
Control Complement
Width 24-5/8"
Height 14-7/8"
Depth 19-1/8"
Width 16-1/8"
Height 9-5/8"
Depth 16-1/8"
Touch Control System
Timer (0 - 99 min. 99 seconds)
Microwave Power for Variable Cooking
Repetition Rate;
P-HI........................................... Full power throughout the cooking time
P-90 ............................................................. approx. 90% of Full Power
P-80 ............................................................. approx. 80% of Full Power
P-70 ............................................................. approx. 70% of Full Power
P-60 ............................................................. approx. 60% of Full Power
P-50 ............................................................. approx. 50% of Full Power
P-40 .............................................................. approx. 40% of Full Power
P-30 .............................................................. approx. 30% of Full Power
P-20 ............................................................. approx. 20% of Full Power
P-10 .............................................................. approx. 10% of Full Power
P-0 ............................................. No power throughout the cooking time
Convection Temperature for Variable Cooking
CONVECTION .............................................. 100 - 450˚F Temp. control
LOW MIX. BAKE............................... 350˚F with 10% microwave power
HIGH MIX. ROAST ........................... 300˚F with 30% microwave power
SLOW COOK.......................................... 300˚F for 4 hours (no preheat)
BROIL ............................................................................ 450˚F (preheat)
CUSTOM HELP pad, SENSOR REHEAT pad, MINUTE PLUS pad, POPCORN pad
COMPU DEFROST pad, SENSOR COOK pad, COMPU BROIL pad
COMPU ROAST pad, COMPU BAKE pad, REHEAT pad, CONVEC pad
BROIL pad, SLOW COOK pad, HIGH MIX / ROAST pad, LOW MIX / BAKE pad
Number and temperature selection pads, KITCHEN TIMER pad, CLOCK pad
STOP/CLEAR pad, POWER LEVEL pad, START / TOUCH ON pad
Oven Cavity Light
Yes
Safety Standard
UL Listed
FCC Authorized
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.
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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
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
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
amp. or more cord. Do not drape over a countertop or table where it can
be pulled on by children or tripped over accidentally.
Grounded
Receptacle Box
3-Pronged Plug
Grounding Pin
3-Pronged Receptacle
CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM
THIS PLUG.
OVEN DIAGRAM
7
1
TOUCH CONTROL PANEL
3
5
10
MIX CONV
12
DEFROST
SENSOR
COOK LBS
9
13
11
6
1.
2.
3.
4.
5.
15
14
6
2
Ventilation openings. (Rear side)
Oven door with see-through window.
Oven lamp.
Turntable support.
Removable turntable.
The turntable will rotate clockwise or
counterclockwise.
6. Safety door latches.
The oven will not operate unless the door is
securely closed.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Wave guide cover.
Door open button.
Auto-Touch control panel.
Lighted digital display.
Convection air openings.
Removable low rack. (Broiling trivet)
Removable low rack. (Baking rack)
Turntable motor shaft.
Power supply cord.
SENSOR
REHEAT
MINUTE
PLUS
POPCORN
COMPU
DEFROST
ELEVATE PKG
1
2
3
4
5
6
7
8
Baked potatoes
Frozen vegetables
Fresh veg-soft
Fresh veg-hard
Frozen entrees
Hot dogs
Bacon
Fish, seafood
HELP
SENSOR
COOKT
Convection
1
2
3
4
Hamburgers
Chicken pieces
Steaks
Fish steaks
COMPU
BROIL
1
2
3
4
Chicken
Turkey
Turkey breast
Pork
COMPU
ROAST
1
2
3
4
Bundt cake
Cookies
Muffins
French fries
COMPU
BAKE
PREHEAT CONVEC
1
100˚F
6
350˚F
BROIL
LOW MIX HIGH MIX
BAKE
ROAST
SLOW
COOK
2
150˚F
7
375˚F
KITCHEN
TIMER
POWER
LEVEL
5
KG
CUSTOM
HELP
Interactive
4
8
OZ
3
4
275˚F
300˚F
8
9
400˚F
425˚F
CLOCK
5
325˚F
0
150˚F
ST OP
TCLEAR
START
TOUCH ON
R-930AK
R-930AW
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions during
oven operation.
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.
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.
POWER LEVEL P-0 TO P-90 COOKING
COOKING CONDITION
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:
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)
RELAY
CONNECTED COMPONENTS
RY-1
Oven lamp/Turntable motor
RY-2
Power transformer
RY-3
Heating element
RY-4
Damper motor
RY-5
Convevtion motor
RY-6
Fan motor
VARI-MODE
ON TIME
Power 10(P-HI)
32 sec.
(100% power)
Power 9(P-90)
30 sec.
(approx. 90% power)
Power 8(P-80)
26 sec.
(approx. 80% power)
Power 7(P-70)
24 sec.
(approx. 70% power)
Power 6(P-60)
22 sec.
(approx. 60% power)
Power 5(P-50)
18 sec.
(approx. 50% power)
Power 4(P-40)
16 sec.
(approx. 40% power)
Power 3(P-30)
12 sec.
(approx. 30% power)
Power 2(P-20)
8 sec.
(approx. 20% power)
Power 1(P-10)
6 sec.
(approx. 10% power)
Power 0(P-0)
0 sec.
(0% power)
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
Note:
6
OFF TIME
0 sec.
2 sec.
6 sec.
8 sec.
10 sec.
14 sec.
16 sec.
20 sec.
24 sec.
26 sec.
32 sec.
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.
R-930AK
R-930AW
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.
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
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.
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).
6 SEC.
26 SEC.
ON
MICROWAVE POWER
= APPROX. 10%
(MICRO.)
OFF
CONVECTION
TEMPERATUE
= 350˚F (180˚C)
(CONVEC.)
LOW MIX
BAKE
12 SEC.
20 SEC.
ON
(MICRO.)
OFF
MICROWAVE POWER
= APPROX. 30%
ON
(CONVEC.)
OFF
32 SEC.
CONVECTION
TEMPERATUE
= 300˚F
HIGH MIX
ROAST
Note:
During alternate Microwave/Convection operation,
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.
AUTOMATIC MIX COOKING CONDITION
Touch the HIGH MIX/ROAST or the LOW MIX/BAKE pad
7
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R-930AW
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.
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.
COMPU DEFROST COOKING
MIC
RO
2. Heat potatoes. Moisture and
humidity is emitted rapidly.
You can smell the aroma as it
cooks.
3. Sensor detects moisture and
humidity and calculates
cooking time and variable
power.
AH SENSOR
MIC
VE
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.
WA
VE
FIRE SENSING FEATURE (MICROWAVE MODE)
RO
WA
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.
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.
0 23
24
30 32 (sec.)
64 (sec.)
6 sec.
CONVECTION
MOTOR
ON
OFF
3 sec.
THERMISTOR
ON
OFF
ON
Sensing
Voltage OFF
Sensing the voltage across the temperature measurement circuit.
8
R-930AK
R-930AW
IMPORTANT:
During sensor cooking operation, the fire sensing operation sequence will not begin until the AH sensor has
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.
SCHEMATIC DIAGRAM
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. CLOCK APPEARS ON DISPLAY.
MAGNETRON
TEMPERATURE
FUSE
RY1
RY6
RY5
RY4
DM
N.O.
(RY1)
RY2
A-9
RY2
PRIMARY
INTERLOCK
RERAY
RY3
CONTROL UNIT
120V
60Hz
OUTER
CASE
SWITCH
F-1
SECONDARY
INTERLOCK
SWITCH
F-2
F-3
E-1 E-2 E-3
DOOR
SENSING
SWITCH
AH SENSOR
E-4 E-5 E-6
THERMISTOR
POWER
TRANSFORMER
CAPACITOR
0.94µ
COM.
(RY3)
A-7
COM.
(RY2)
N.O.
(RY2)
N.O.
(RY3)
DAMPER
SWITCH
HEATIMG ELEMENT
DAMPER MOTOR
OVEN LAMP
FAN MOTOR
TURNTABLE MOTOR
OUTER
CASE
SWITCH
CONVECTION MOTOR
FM CM
TTM OL
COM.
(RY1)
A-5
MAGNETRON
A-3
A-1
MONITOR SWITCH
FUSE
H.V. RECTIFIER
CONV.
THERMAL
CUT-OUT
Figure O-1. Oven Schematic-OFF Condition
SCHEMATIC
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
3. “START” PAD TOUCHED.
MAGNETRON
TEMPERATURE
FUSE
RY1
RY6
RY5
RY4
DM
RY2
A-9
RY3
CONTROL UNIT
F-1
SECONDARY
INTERLOCK
SWITCH
F-2
AH SENSOR
F-3
E-1 E-2 E-3
DOOR
SENSING
SWITCH
RY2
PRIMARY
INTERLOCK
RERAY
E-4 E-5 E-6
THERMISTOR
DAMPER
SWITCH
COM.
(RY2)
N.O.
(RY2)
N.O.
(RY3)
Figure O-2. Oven Schematic-Microwave Cooking Condition
9
POWER
TRANSFORMER
CAPACITOR
0.94µ
COM.
(RY3)
A-7
120V
60Hz
OUTER
CASE
SWITCH
N.O.
(RY1)
HEATIMG ELEMENT
DAMPER MOTOR
OVEN LAMP
FAN MOTOR
TURNTABLE MOTOR
OUTER
CASE
SWITCH
CONVECTION MOTOR
FM CM
TTM OL
COM.
(RY1)
A-5
MAGNETRON
A-3
A-1
MONITOR SWITCH
FUSE
H.V. RECTIFIER
CONV.
THERMAL
CUT-OUT
R-930AK
R-930AW
SCHEMATIC
DOOR CLOSED.
MIX COOKING PAD TOUCHED.
COOKING TIME PROGRAMMED.
“START” PAD TOUCHED.
RY2 AND RY3 WILL ALTERNATELY CLOSE.
DURING COOK CYCLE.
MAGNETRON
TEMPERATURE
FUSE
A-3
A-1
FM CM
COM.
(RY1)
A-5
RY1
RY6
RY5
RY4
DM
N.O.
(RY1)
RY2
A-9
RY2
PRIMARY
INTERLOCK
RERAY
RY3
CONTROL UNIT
120V
60Hz
OUTER
CASE
SWITCH
F-1
SECONDARY
INTERLOCK
SWITCH
F-2
F-3
E-1 E-2 E-3
DOOR
SENSING
SWITCH
AH SENSOR
E-4 E-5 E-6
THERMISTOR
POWER
TRANSFORMER
CAPACITOR
0.94µ
COM.
(RY3)
A-7
COM.
(RY2)
N.O.
(RY2)
N.O.
(RY3)
DAMPER
SWITCH
HEATIMG ELEMENT
DAMPER MOTOR
CONVECTION MOTOR
FAN MOTOR
OVEN LAMP
OUTER
CASE
SWITCH
TURNTABLE MOTOR
TTM OL
MONITOR SWITCH
FUSE
MAGNETRON
CONV.
THERMAL
CUT-OUT
H.V. RECTIFIER
1.
2.
3.
4.
5.
Figure O-3. Oven Schematic-Automatic Mix Cooking Condition
SCHEMATIC
DOOR CLOSED.
CONVECTION PAD TOUCHED.
DESIRED TEMP. TOUCHED.
COOKING TIME PROGRAMMED.
“START” PAD TOUCHED.
MAGNETRON
TEMPERATURE
FUSE
A-3
A-1
COM.
(RY1)
A-5
RY1
RY6
RY5
RY4
DM
RY2
A-9
RY3
CONTROL UNIT
F-1
SECONDARY
INTERLOCK
SWITCH
F-2
AH SENSOR
F-3
E-1 E-2 E-3
DOOR
SENSING
SWITCH
RY2
PRIMARY
INTERLOCK
RERAY
E-4 E-5 E-6
THERMISTOR
DAMPER
SWITCH
COM.
(RY2)
N.O.
(RY2)
N.O.
(RY3)
Figure O-4. Oven Schematic-Convection Cooking Condition
10
POWER
TRANSFORMER
CAPACITOR
0.94µ
COM.
(RY3)
A-7
120V
60Hz
OUTER
CASE
SWITCH
N.O.
(RY1)
HEATIMG ELEMENT
DAMPER MOTOR
FAN MOTOR
OVEN LAMP
TURNTABLE MOTOR
OUTER
CASE
SWITCH
CONVECTION MOTOR
FM CM
TTM OL
MONITOR SWITCH
FUSE
MAGNETRON
CONV.
THERMAL
CUT-OUT
H.V. RECTIFIER
1.
2.
3.
4.
5.
R-930AK
R-930AW
DESCRIPTION AND FUNCTION OF COMPONENTS
DOOR SENSING AND SECONDARY INTERLOCK
SWITCHES
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.
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.
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.
DOOR SENSING
SWITCH
MONITOR FUSE
This outer case mounting screw is
pushing the actuator.
MONITOR SWITCH
SECONDARY
INTERLOCK
SWITCH
ACTUATOR
OUTER CASE
CABINET
Figure D-1. Door sensing switch, monitor switch and
secondary interlock switches
MONITOR SWITCH
OUTER CASE
SWITCHES
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.
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.
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.
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).
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.
11
R-930AK
R-930AW
Damper is in the closed position, so that no hot air will be
allowed to leak out the oven cavity.
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.
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.
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 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
condensation compartment.
Convection Cooking:
DAMPER CAM
DAMPER SWITCH
DAMPER MOTOR
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
Replace
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
A
B
MAGNETRON
POWER TRANSFORMER
C
H.V. RECTIFIER ASSEMBLY
D
E
HIGH VOLTAGE CAPACITOR
SECONDARY INTERLOCK SWITCH
F
PRIMARY INTERLOCK SYSTEM
G
MONITOR SWITCH
H
I
MONITOR FUSE
MAGNETRON TEMPERATURE FUSE
J
CONV. THERMAL CUT-OUT
K
L
CONVECTION HEATER
THERMISTOR
M
DAMPER MOTOR
N
P
DAMPER SWITCH
OUTER CASE SWITCH
Q
TOUCH CONTROL PANEL
R
KEY UNIT
S
S
RELAY RY-1
RELAY RY-2
S
RELAY RY-3
S
S
RELAY RY-4
RELAY RY-5
S
RELAY RY-6
U
V
FOIL PATERN ON PWB.
AH SENSOR
Replace
OVEN LAMP OR SOCKET
Replace
FAN MOTOR
Replace
TURNTABLE MOTOR
CONVECTION MOTOR
Check
LOOSE WIRING
Check
Check
SHORTED IN POWER CORD
NO POWER AT OUTLET
Check
LOW VOLTAGE
13
(CONVECTION)
Oven in the sensor cooking condition but AH sensor does not end or AH
sensor turns off about max. 30 min. after start.
Convection cycle runs 4 minutes and 15 seconds then shuts down.
Cooling fan motor runs intermittently or all the time.
Temperature in the oven cavity is lower or higher than preset.
CONV indicator lights, but heating element does not heat.
(MICROWAVE)
CONV indicator lights, but oven does not go into cook cycle when
START pad is touched.
Function of COMPU DEFROST does not operate properly.
Function of variable cooking does not operate properly except HIGH
power.
Extremely uneven heating is produced in oven load (food).
COOKING CONDITION
Low or no power is produced during microwave cooking (The food is
heated incompletely or not heated at all)
Oven does not go into a cook cycle, when START pad is touched.
Turntable motor operates normally but cooling fan motor does not
operate.
Oven lamp light, but turntable motor does not operate.
Cooking cycle runs 1 minute then shuts down.
OFF CONDITION
Oven lamp does not light in cook cycle. (It light when door is opened).
Oven lamp does not light with door opened.
Display does not operate properly when STOP/CLEAR pad is touched.
(The time of day should appear on the display with beep sound.)
88:88 does not appear in display when power cord is first plugged into
wall receptacle.
CONDITION
Monitor fuse blows when power cord is plugged into wall receptacle
Home fuse blows when power cord is plugged into wall receptacle.
PROBLEM
TEST PROCEDURE
R-930AK
R-930AW
(SENSOR
COOKING)
R-930AK
R-930AW
TEST PROCEDURES
PROCEDURE
LETTER
A
COMPONENT TEST
MAGNETRON ASSEMBLY 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.
B
POWER 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.)
C
HIGH 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.
D
HIGH VOLTAGE CAPACITOR TEST
DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS
OR WIRING.
14
R-930AK
R-930AW
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
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.
E
SECONDARY 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.
F
PRIMARY 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.
G
MONITOR 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
N.C.
meter should indicate an open circuit.
MONITOR SWITCH
If improper operation is indicated, the
switch may be defective. After testing
COM.
the monitor switch, re-connect the wire SCREW DRIVER
lead to the monitor switch (NC) terminal and check for continuity of monitor
SECONDARY
circuit.
INTERLOCK
OHMMETER
SWITCH
H
BLOWN 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.
I
TEMPERATURE 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
R-930AK
R-930AW
TEST PROCEDURES
PROCEDURE
LETTER
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.
J
THERMAL CUT-OUT TEST
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.
K
HEATING ELEMENT TEST
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.
L
THERMISTOR 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.
Room Temperature
68˚F(20˚C) - 86˚F(30˚C)
Resistance
Approx. 350kΩ - 155KΩ
If the meter does not indicate above resistance, replace the thermistor
M
DAMPER 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.
N
DAMPER 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.
O
CHECKING 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
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
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%.
P
OUTER 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.
Q
TOUCH 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.
R
KEY 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.
17
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TEST PROCEDURES
PROCEDURE
LETTER
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.
G5
S
G6
G7
G4
MINUTE COMPU SENSOR
PLUS DEFROST COOK
G3
POPCORN PREHEAT CONVEC
G2
SENSOR
REHEAT
G1
CUSTOM
HELP
SLOW
COOK
LOW MIX
BAKE
G8
G9
G10
G11
G12
COMPU
BROIL
COMPU
ROAST
COMPU
BAKE
BROIL
HIGH MIX
ROAST
1
2
3
4
5
100˚F
150˚F
275˚F
300˚F
325˚F
6
7
8
9
0
350˚F
375˚C
400˚F
425˚F
450˚F
CLOCK
START
TOUCH ON
STOP
CLEAR
KITCHEN POWER
TIMER
LEVEL
RELAY 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
unit is defective.
RELAY SYMBOL
T
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
RY2(COOK)
Approx. 19.0V D.C.
Approx. 18.0V D.C.
Oven lamp / Turntable motor
Power transformer
RY3(HEATER)
RY4
Approx. 18.0V D.C.
Approx. 19.0V D.C.
Heating element
Damper motor
RY5
Approx. 19.0V D.C.
Convection motor
RY6
Approx. 19.0V D.C.
Cooling fan motor
COMPU 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.
WEIGHT
0.5lbs
1ST STAGE
LEVEL TIME
70%
47sec.
2ND STAGE
3RD STAGE
LEVEL TIME LEVEL TIME
0%
52sec.
50%
32sec.
4TH STAGE
LEVEL TIME
30%
40sec.
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
U
PROCEDURES 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.
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
Problem: POWER ON, indicator does not light up.
STEPS
1
OCCURRENCE
CAUSE OR CORRECTION
The rated voltage is not applied to POWER
terminal of CPU connector (CN-A).
The rated voltage is applied to primary side
of power transformer.
Power transformer or secondary circuit defective.
Check and repair.
3
Only pattern at "a" is broken.
*Insert jumper wire J1 and solder.
4
Pattern at "a" and "b" are broken.
*Insert the coil RCILF2003YAZZ between "c" and "d".
2
5
b
3
T1
26
9
CN - A
POWER
a
(J1)
7
V
P
d
VRS1
3
CONV M FAN M
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.
Check supply voltage and oven power cord.
c
AH 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
time.
If ERROR appears check sensor wire connections and/or AH sensor.
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
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
condition is 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
F-1
F-2
To connector (F)
on Control Unit.
1
2
3
NC
NO
R1,R2 : 22Ω ± 1% 1/2W
R3 : 4.3kΩ ± 5% 1/4W
R4 : 1MΩ ± 5% 1/4W
COM
COM NO
R1
F-3
R2
CONNECTOR
R3
R4
Sensor Dummy Resistor Circuit
20
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TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
The touch control section consists of the following units
as shown in the touch control panel circuit.
4) ACL Circuit
A circuit to generate a signals which resetting the LSI to
the initial state when power is applied.
(1) Key Unit
(2) Control Unit
5) Buzzer Circuit
The buzzer is responds to signals from the LSI to emit
noticing sounds (key touch sound and completion sound).
The principal functions of these units and the signals
communicated among them are explained below.
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.
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.
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.
1) LSI
This LSI controls the temperature measurement signal,
AH sensor signal, key strobe signal, relay driving signal
for oven function and indicator signal.
9) Relay Circuit
To drive the magnetron, heating element, fan motor,
convection motor, damper motor, turntable motor and
light the oven lamp.
2) Power Source Circuit
This circuit generates the voltages necessary for the
control unit from the AC line voltage.
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.
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.
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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.
Signal
I/O
1
2
VCC
VEE
IN
IN
3
AVSS
IN
4
VREF
IN
5
AN7
IN
6
AN6
IN
7-9
10
AN5-AN3
AN2
IN
IN
11
AN1
IN
12
AN0
IN
13
P55
OUT
Description
Connected to GND.
Anode (segment) of Fluorescent Display light-up voltage: -30V.
Vp voltage of power source circuit input.
Power source voltage: -5V.
VC voltage of power source circuit input.
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V)
Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is
an analog input terminal from the AH sensor circuit, and connected to the A/D
converter built into the LSI.
AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the
A/D converter built into the LSI.
Heating constant compensation terminal.
Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal(0V).
Door opened; "L" level signal(-5V).
Input signal which communicates the damper open/close information to LSI.
Damper opened; "H" level signal(0V:GND).
Damper closed; "L" level signal(-5V).
Temperature measurement input: OVEN THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
Digit selection signal.
The relationship between digit signal and digit are as follows;
H
Digit signal
Digit
ß(60Hz)
L
P03........................... 1st.
GND
P02.......................... 2nd.
P01........................... 3rd.
P00........................... 4th.
P37........................... 5th.
P36.......................... 6th.
P03
VP
P02
P01
P00
P37
P35.......................... 7th.
14
P54
OUT
P36
P55.......................... 8th.
P35
Normally, one pulse is output in every ß
P55
period, and input to the grid of the Fluorescent Display.
Oven 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.
16.7 msec.
H
L
During cooking
15
16
P53
P52
OUT
OUT
Convection motor driving signal.
To turn on and off shut-off relay(RY5). "L"
level during CONVECTION; "H" level otherwise.
Cooling fan motor driving signal.
To turn on and off shut-off relay(RY6). "L"
level during both microwave and convection
cooking; "H" level otherwise.
22
ON
ON
During
cooking
(Convection)
During
cooking
OFF
H. GND
L
OFF
H. GND
L
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Pin No.
17
Signal
I/O
P51
OUT
Description
Magnetron 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.
18
P50
OUT
VARI MODE
ON TIME
OFF 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.
Damper motor relay driving signal.
OFF
To turn on and off shut-off relay(RY4).
19
P47
OUT
P46-P45
P44
OUT
OUT
23
P43
OUT
24
P42
OUT
25
INT1
IN
20-21
22
ON
H : GND
L
Heating element driving signal.
To turn on and off shut-off relay(RY3). "L" level during
H. GND
During
convection cooking; "H" level otherwise. During conOFF
cooking
(Convection)
vection cooking, the signal becomes "H" level when
ON
L
the temperature of the oven cavity exceeds the
predetermined temperature.
Terminal not used.
Timing signal output terminal for temperature measurement(OVEN THERMISTOR).
"H" level (GND) : Thermistor OPEN timing.
"L" level (-5V) : Temperature measuring timing.(Convection cooking)
0.1 sec
Signal to sound buzzer.
A
A: key touch sound.
2.0 sec
B: Completion sound.
B
C: When the temperature of the oven cavity
reaches the preset temperature in the
1.0 sec
1.0 sec
H: GND
preheating mode, or when the preheating
C
L
hold time (30 minutes) is elapsed.
Timing signal output terminal for temperature measurement(OVEN).
"H" level (GND) : Ttermistor OPEN timing.
"L" level (-5V) : Temperature measuring timing.(Convection cooking)
Signal to synchronize LSI with commercial power source freqency.
H : GND
This is the basic timing for all real time
processing of LSI.
L (-5V)
16.7 msec.
26
27
P40
RST
IN
IN
XCIN/XCOUT
XIN
OUT
IN
31
XOUT
OUT
32
VSS
IN
33
P27
IN
28/29
30
Connected to GND.
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily
set to "L" level the moment power is applied, at this time the LSI is reset. Thereafter
set at "H" level.
Terminal not used.
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Power source voltage: -5V.
VC voltage of power source circuit input.
Signal 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.
Signal
I/O
34
P26
IN
35
P25
IN
36
P24
IN
37
P23
OUT
38-40
P22-P20
OUT
41
P17
OUT
42
P16
OUT
43
44
45
46
47
P15
P14
P13
P12
P11
OUT
OUT
OUT
OUT
OUT
Description
Signal similar to P27.
When any one of G-2 line key on key matrix is touched, a corresponding signal will be
input into P26.
Signal similar to P27.
When any one of G-3 line key on key matrix is touched, a corresponding signal will be
input into P25.
Signal similar to P27.
When any one of G-4 line key on key matrix is touched, a corresponding signal will be
input into P24.
Segment data signals.
The relation between signals and indicators are as follows:
Signal Segment Signal Segment Signal Segment Signal Segment
P23 ............. P1
P17 ............. P5
P13 ............. P9
P07 ........... P13
P22 ............. P2
P16 ............. P6
P12 ........... P10
P06 ........... P14
P21 ............. P3
P15 ............. P7
P11 ........... P11
P05 ........... P15
P20 ............. P4
P14 ............. P8
P10 ........... P12
P04 ........... P16
Segment data signal.
Signal similar to P23.
Segment data signal.
Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse
signal is input to P24-P27 terminal while one
of G-12 line keys on key matrix is touched.
Segment data signal.
Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal
one of G-11 line keys on key matrix is touched.
Segment data signal.
Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal
one of G-10 line keys on key matrix is touched.
Segment data signal.
Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal
one of G-9 line keys on key matrix is touched.
Segment data signal.
Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal
one of G-8 line keys on key matrix is touched.
Segment data signal.
Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal
one of G-7 line keys on key matrix is touched.
Segment data signal.
Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal
one of G-6 line keys on key matrix is touched.
24
while
while
while
while
while
while
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Pin No.
48
Signal
P10
I/O
OUT
49-53
P07-P03
OUT
54-56
P02-P00
OUT
57-59
P37-P35
OUT
60-64
P34-P30
OUT
Description
Segment data signal.
Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal while
one of G-5 line keys on key matrix is touched.
Segment data signal.
Signal similar to P23.
Digit selection signal.
Signal similar to P55.
Digit selection signal.
Signal similar to P55.
Used for initial balancing of the bridge circuit (absolute humidity sensor).
ABSOLUTE HUMIDITY SENSOR CIRCUIT
(1) Structure of Absolute Humidity Sensor
The absolute humidity sensor includes two thermistors
as shown in the illustration. One thermistor is housed in
the closed vessel filled with dry air while another in the
open vessel. Each sensor is provided with the protective
cover made of metal mesh to be protected from the
external airflow.
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.
Sensing part Sensing part
(Open vessel) (Closed vessel)
Sensing part
(Open vessel)
Ventilation
openings
Thermistor
element
Sensor
case
Thermistor
element
Sensing part
(Closed vessel)
Cross section view
View of sensor case removed
(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.
1) Absolute humidity sensor circuit
IC2(IZA495DR)
4
64
5
63
6
62
150k
7
61
75k
8
60
3
5
620k
300k
S : Thermistor
open vessel
C : Thermistor
closed vessel
47k
11
F-1
C
F-3
3.57k
0.1
µF
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
S
R51
F-2
3.32k 1.8k
10
VA : -15V
25
+
10k
360k
9
VA : -15V
SW3
P32
SW4
P33
SW5
P34
AN7
LSI
(IC1)
2
47k
12
SW2
P31
0.01µF
R3
R2
37.4k
0.01µF
S
C. Thermistor in
closed vesssl
S. Thermistor in
open vessel
0.015µF
Operational
R1 amplifier
Output
voltage
+
Output voltage
C
Absolute humidity vs,
output voltage characterist
SW1
P30
1
VC : -5V
6
AN6
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R-930AW
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.
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).
approx. 1M ohm
2. Shapes of Electronic Components
E
C
Transistor
B
Transistor
2SB910M
E
CB
DTA123ES
KRA101M
KRA223M
KRC243M
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
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
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.
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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
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.
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
it from retaining clips on the cavity face plate.
4. Lift entire case from the unit.
CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE REMOVING OUTER CASE.
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. 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
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transformer.
5. Disconnect wire leads from the transformer.
6. Remove two (2) screws holding the transformer to the
base cabinet.
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.
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
NOTE HOT (ORANGE) WIRE MUST BE CONNECTED
TO THE POWER TRANSFORMER TERMINAL
NEAREST TO THE TRANSFORMER MOUNTING
SCREW.
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.
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.
HIGH VOLTAGE RECTIFIER ASSEMBLY REMOVAL
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
magnetron.
CAUTION: WHEN REPLACING THE SILICON RECTIFIER
ASSEMBLY, THE GROUND SIDE TERMINAL
MUST BE SECURED FIRMLY WITH A
GROUNDING SCREW.
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.
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.
POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL
Terminal
Positive lock®
connector
1
Push the lever of positive lock® connector. Pull down on the
positive lock® connector.
Push
Lever
CAUTION: WHEN YOU CONNECTING THE POSITIVE
LOCK® CONNECTORS TO THE TERMINALS,
INSTALL THE POSITIVE LOCK® SO THAT
THE LEVER FACES YOU.
2
Pull down
Figure C-2. Positive lock®connector
CONVECTION MOTOR REMOVAL
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.
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
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TURNTABLE MOTOR REMOVAL
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.
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.
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
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.
HEATER UNIT ASSEMBLY REMOVAL
(HEATING ELEMENT/CONVECTION FAN/CONVECTION MOTOR/THERMISTOR)
THERMISTOR REMOVAL
HEATING ELEMENT REMOVAL
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.
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.
Long nose plier
Heating
element
Heating element
holder
OVEN LAMP AND LAMP SOCKET REMOVAL
Oven lamp
socket
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.
Terminal
Wire lead
Terminal hole
Flate type small
screw driver
Figure C-3. Oven lamp socket
FAN MOTOR REMOVAL
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).
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
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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.
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
Coil
Groove joint pliers
Side View
Rear View
Table
Shaft
Stator
These are the position
where should be
pinched with pliers
Axis
Gap
Bracket
Rotor
Center of
bracket
Stator
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.
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.
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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.
8. Switch is now free.
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.
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.
DOOR SENSING
SWITCH
MONITOR FUSE
MONITOR SWITCH
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.)
SECONDARY
INTERLOCK
SWITCH
Figure C-4. Latch Switch Adjustments
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: 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.
Note:
When the individual parts are replaced, refer to
"Door Disassembly".
6. On re-installing door, insert the upper oven hinge into the
door hinge pin. Then while holding door in place.
7. Make sure 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.
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.)
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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.
UPPER OVEN HINGE
RE-INSTALL
DOOR ASSEMBLY
LATCH
HEADS
LOWER OVEN HINGE
RE-INSTALL
Figure C-5. Door Replacement and adjustment
DOOR DISASSEMBLY
2 LIFT UP
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.
PUTTY KNIFE
1 BENT
CHOKE COVER
Door Bent
Panel
INSIDE Choke
cover
Upper
Lower
FRONT
Figure C-6. Door Disassembly
32
1
2
3
33
4
CN-A
RY6
RY4
RY5
RY1
T1
RED
BRN
BLK
ORG
ORG
BRN
BRN
RED
5
1
2
3
4
5
6
7
8
9
WHT
PPL
BRN
ORG
CN-A
RY1 (N.O.)
RY1 (COM.)
RY2 (N.O.)
RY2 (COM.)
RY3 (N.O.)
RY3 (COM.) BRN
RED
GRN
ORG
PNK
RED
COM
SECONDARY
INTERLOCK
SWITCH
6
GRY
TURNTABLE
MOTOR
PNK
GRY
G
R
Y
G
R
Y
ORG
GRY
WHT
RED
PNK
COM
W
H
T
COM
OUTER CASE
SWITCH
(Cabinet side)
N.O.
OUTER CASE
SWITCH
(Oven side)
N.O.
BRN
GRY
CONVECTION MOTOR
WHT
WHT
DAMPER
MOTOR
Figure S-1. Pictorial Diagram
RED 2 RED
RED 1 RED
THERMISTOR
R
E
D
HEATING
ELEMENT
COM
N.O. DAMPER
SWITCH
PNK
PNK
ORG
GRY
HIGH VOLTAGE
CAPACITOR
W W
H H
T T
P
P
L
BLK
RED
OVEN
THERMAL
CUT-OUT
PNK
WHT
N
GRN
POWER SUPPLY CORD
120V 60Hz
H
NOTE:
The grounding conductor of
the power supply cord has
been grounded by power
supply cord fixing screw.
The screw must be kept
allways tight.
COOLING
FAN
MOTOR
NOTE:
Hot (ORG) wire must be connected to the
power transformer terminal nearest to the
transformer mounting screw.
NOTE:
The neutral (WHT) wire
must be connected to
the terminal with "N"
mark on the power
supply cord.
G
R
Y
RED
POWER TRANSFORMER
BLK
5
GRY
WHT
N.O. WHT
COM
ORG
WHT
GRY
BLUE MARK
PNK
RED
RED
4
7
9
1
3
5
N.O.
COM.
RY2
CN-E
6
5
4
3
2
1
5
4
3
2
1
6 PNK
MONITOR
SWITCH
N.C.
NOTE:
Hot (YLW & PNK) wire
must be connected to the
terminal with blue mark
on the oven light socket.
BLK
RED
3
N.O.
COM.
RY3
COM.
CN-F
G
CN-E
RED
MONITOR FUSE
& FUSE HOLDER
BLK
GRN
WHT
GRY
D
1
3
IC-1
COM
F
ORG
GRN
GRN
MAGNETRON
2
N.O.
CN-G
H
N.O.
DOOR
SENSING
SWITCH
E
OVEN LAMP
& SOCKET
C
HIGH VOLTAGE COMPONENTS
B
MAGNETRON
TEMPERATURE
FUSE
1
CONTROL PANEL
AH SENSOR
A
CN-F
1 BLK
2 RED
3 WHT
R-930AK
R-930AW
6
A
B
C
D
E
F
G
H
3
34
OVEN LAMP
TURNTABLE
MOTOR
HEATING
ELEMENT
4
COM
NO
COM
NO
COM
NO
A5
FAN
MOTOR
POWER
TRANSFORMER
A3
A1
CONV.
MOTOR
DAMPER
MOTOR
A7
c
RY1
RY3
RY2
RY6
RY5
D2
D3
C2 1000µ/35v
C1 0.1µ/50v
D23
(J1)
ZD2
Q1
2SB1238
470 1/2w
+
–
Q22
KRA101M
Q21
KRA101M
Q20
KRA101M
R3 330 1/2w
5
C11
C3 0.1µ/50v
E1
C50
6
Q3
KRA101M
R8 4.7k
E4
OVEN
THERMISTOR
E3
R62 75kF
F1
(A)
(C)
F3
AH SENSOR
F2
(B)
CF1 4.19MHz
VCC 1
VEE
AVSS
VREF
AN7
AN6
AN5
AN4
AN3
AN2 10
AN1
AN0
P55
P54
P53 15
P52
P51
P50
P47
P46 20
P45
P44
P43
P42
INT1 25
P40
RST
XCIN
XCOUT
XIN 30
XOUT
VSS 32
R90 100k
P30
P31
P32
P33
P34
P35
P36
P37
P00
P01
P02
P03
P04
P05
P06
P07
P10
P11
P12
P13
P14
P15
P16
P17
P20
P21
P22
P23
P24
P25
P26
P27
C70 330pF x 4
33
35
40
45
50
55
60
64
1
Q90
KRA101M
(VP)
C10 0.1µ/50v
Figure S-2. Control Panel Circuit
DAMPER
SWITCH
E6
C60
Q40
KRA101M
C5 0.1µ/50v
R51 4.7k
E5
–
+
G1
G2
G3
G4
(C)
IC2 IZA495DR
G5
(A)
R100 330 1w
(VP)
G6
SENSOR
DEFROST
MIX CONV
G7
KEY UNIT
CUSTOM
HELP
SENSOR
REHEAT
SLOW
COOK
LOW MIX
BAKE
POPCORN PREHEAT CONVEC
MINUTE COMPU SENSOR
PLUS DEFROST COOK
(B)
12
F 31, 32
F
1, 2
8G
29
NOTE
COOK
LBS
3
275˚F
8
400˚F
CLOCK
2
150˚F
7
375˚C
1
100˚F
6
350˚F
KITCHEN POWER
TIMER
LEVEL
G10
COMPU
BAKE
G9
COMPU
ROAST
G8
COMPU
BROIL
OZ
FLUORESCENT DISPLAY TUBE
KG
: IF NOT SPECIFIED. 1SS270A
: IF NOT SPECIFIED. 0.01µ/16v
: IF NOT SPECIFIED. 1/4w ± 5%
HELP
G12
450˚F
STOP
CLEAR
START
TOUCH ON
0
325˚F
5
HIGH MIX
ROAST
425˚F
9
300˚F
4
BROIL
G11
5
DOOR
SWITCH
E2
R31 4.7k
C30
Q23
KRA101M
+
–
R4 750 1/2w
–
R40 3.3k
Q4
DTA123ES
4
D30
Q26
KRC243M
Q25
KRA101M
Q24
KRA101M
–
C4 10µ/35v
C21 0.1µ/50v
C22 0.1µ/50v
10G471K
RY4
4
(J2)
HZ16-1
SP40
+
HZ5C2
C9 0.01µ/50v
22µ
/25v
ZD3
R50 15k
R2
C20 10µ/35v
ZD4
+
(J4)
C6 10µ/35v
(J3)
D4
(J5)
D1
R7 4.7k
5
(J6)
HZ4A2
R63 100F
3
(J7)
d
C7
VRS1
a
IC1 IZA797DR
b
C8
R64 2.2kF
R11 18 1w
R70 3.3k
R10 18 1w
R71 3.3k
CONTROL UNIT
R72 3.3k
+
R73 3.3k
D1-4 : 11ES1
28
27
7G
6G
–
26
5G
D7
25
4G
D72 R76
3.3k
AC120V
60Hz
7
100k
D20
D21
D22
D24
D25
D26
100k
R91
24
23
22
20
3G
2G
1G
P16
R77
D73 3.3k
8
P15 19
P14 18
P13 17
T1
P12 16
D74 R78
3.3k
1
3
R30 15k
100k
R92
D70 R74
3.3k
C
D71 R75
3.3k
2
D31
P11 15
P10 13
P9 12
2
9
8
1
11
10
H
P8
P7
G
P6
P5
F
D76 R80
3.3k
E
7
6
5
4
D
R93
B
D75 R79
3.3k
A
P4
P3
P2
P1
1
D77 R81
3.3k
A9
R-930AK
R-930AW
6
A
B
C
D
E
F
G
H
R-930AK
R-930AW
1
2
4
3
5
6
A
A
R
1
32
DIP
,F
B
B
E
Q90
1
2
C10
(C81)
R86(J8)
(ONLY
PHR)
(CF1)
32
CF1
(R85)
D70
D71
D72
D73
D74
D75
D76
D77
R93
33
R73
R72
R71
R70
B
3
R90
C70
R80
R81
1
(C80)
(R45)
(C45)
C7
R7
R8
C8
3
E
E
C
5
B
Q4
B
Q3
1
R79
R78
R77
R76
R75
6
12
C9
R64
64
9
C5
4
5
D
1
8
3
14
R40
1
CN - F
15
17
18
6
R31
R30
BRN
D31
D30
C4
E
Q1
D23
RY2
1
Q24 E
C3
B
E
E
D21
D3
D4
D1
F
B
D20
4
1
S1
1
5
P
VRS1
3
5
7
DAMP M CONV M FAN M
RY4
E
Q22
25
Q20
D2
E
BE
Q26
23
24 B
C1
C20
BLK
C22
B
Q21
RY5
21
C2
22
ZD2
D26
R2
B Q23
20
RY1
POWER
PINK RED (BRN
OL TTM
RED)
R3
E
DOOR
SW
B
3 2
Q25
CN - E
ORG
POWER TRANS
B
5 4
R62
C21
19
E
D24
RY3
OVEN
TEMP
R63
R50
R51
Q40
DAMP
SW
R4
E
B
F
(C47)
IC3
1
C30
C50
C60
13
16
D25
S2
3
8
9
D7
26
POWER
G
T1
(J1)
7
G
(R49)
(C46)
C6
(R46)
CN - G
IC2
10
11
12
(J7)
(J5)
(J3)
(J2)
(J4)
(J6)
CONV
HEATER COM
RED
(R47)
(R48)
1
8
R100
12
D
ZD3
ZD4
7
12
R74
E
1
(CN - D)
4
IC1
(CN - G)
(ONLY 9X58PJ)
C
R91
R92
CN - A
D22
C11
R10
RY6
R11
0
H
H
Figure S-3. Printed Wiring Board
1
2
4
3
35
5
6
R-930AK
R-930AW
PARTS LIST
◊Refer to "MPORTANT" described at end of parts list.
REF. NO.
PART NO.
DESCRIPTION
Q'TY
CODE
1
1
1
3
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AT
AH
AF
AK
AN
AK
AG
AL
AS
AK
AG
AG
AZ
AZ
AW
BP
AX
AV
AP
BL
BG
BN
AY
AY
1
1
1
1
1
1
4
1
1
1
1
1
1
BF
BF
AC
AX
AB
AA
AD
AS
AG
AG
AF
AM
AD
1
1
1
1
1
1
2
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
4
1
7
2
8
BU
AC
AC
AD
AF
AY
AG
AB
AF
AB
AA
AB
AA
AH
AB
AB
AA
AA
AM
AB
AH
AH
AH
AE
AG
AB
AA
AA
AA
AA
ELECTRICAL PARTS
1- 1
1- 2
1- 3
1- 4
1- 5
1- 6
1- 7
1- 8
1- 9
1-10
1-10
1-11
1-13
1-14
1-15
1-16
1-17
1-17
1-18
1-19
1-19
1-19
1-20
1-21
FACCDA048WRE0
FFS-BA012WRK0
QFSHDA009WRE0
QSW-MA110WRE0
FH-HZA041WRE0
QSW-MA110WRE0
QFS-TA013WRE0
RTHM-A085WRE0
RMOTDA192WRE0
RLMPTA071WRE0
RLMPTA027WRE0
QSOCLA021WRE0
RMOTEA283WRE0
RMOTEA300WRE0
RHET-A136WRE0
RTRN-A527WRE0
RC-QZA173WRE0
RC-QZA211WRE0
FH-DZA053WRK0
RV-MZA256WRE0
RV-MZA114WRE0
RV-MZA222WRE0
RMOTDA222WRE0
FDTCTA183WRK0
Power supply cord
Monitor fuse 20A and monitor switch (V-5220D-070) assembly
Fuse holder
Secondary interlock switch & outer case switches
Thermistor
Damper and door sensing switches
Magnetron temperature fuse 150˚C
Oven thermal cut-out 150˚C
Damper motor
Oven lamp
Oven lamp (Interchangeable)
Oven lamp socket
Convection fan motor
Fan motor
Heating element
Power transformer
H.V.capacitor
H.V.capacitor (Interchangeable)
H.V.rectifier assembly
Magnetron
Magnetron (Interchangeable)
Magnetron (Interchangeable)
Turntable motor
AH sensor assembly
2- 1
2- 1
2- 2
2- 3
2- 3-1
2- 3-2
2- 4
2- 5
2- 6
2- 7
2- 8
2- 9
2-10
GCABUA463WRP0
GCABUA457WRP0
TMAPCA732WRR0
FDAI-A179WRY0
GCOVHA156WRP0
XHTSD40P08RV0
GLEGPA019WRE0
GCABDA087WRW0
LHLDKA009WRF0
LBNDKA036WRP0
FHNG-A092WRM0
PHOK-A043WRF0
MLEVPA122WRF0
Outer case cabinet [R-930AW]
Outer case cabinet [R-930AK]
Schematic diagram
Base cabinet
Turntable motor cover
Screw; 4mm x 8mm
Foot
Rear cabinet
Cord holder
Capacitor holder
Oven hinge (Lower)
Latch hook
Switch lever
3- 1
3- 1A
3- 1B
3- 1C
3- 1D
3- 1E
3- 1F
C1
C2
C3
C4
C5
C6
C7-8
C9
C10
C11
C20
C21
C22
C30
C50
C60
C70
CF1
D1-4
D7
D20-26
D30-31
D70-77
CPWBFA748WRK0
QCNCMA227DRE0
QCNCMA267DRE0
QCNCMA237DRE0
QCNCWA057DRE0
RV-KXA077DRE0
PCUSGA381WRP0
RC-KZA087DRE0
VCEAB31VW108M
RC-KZA087DRE0
VCEAB31VW106M
RC-KZA087DRE0
VCEAB31VW106M
VCKYD11CY103N
VCTYF31HF103Z
RC-KZA087DRE0
VCEAB31EW226M
VCEAB31VW106M
VCEAB31HW104M
RC-KZA087DRE0
VCKYD11CY103N
VCKYD11CY103N
VCKYD11CY103N
RMPTEA009DRE0
RCRS-A035DRE0
VHD11ES1///-1
VHD1SS270A/-1
VHD1SS270A/-1
VHD1SS270A/-1
VHD1SS270A/-1
Control unit
5-pin connector(A)
6-pin connector(E)
3-pin connector(F)
12-pin connector(G)
Fluorescent display tube
Cushion
Capacitor
0.1µF 50V
Capacitor 1000µF 35V
Capacitor
0.1µF 50V
Capacitor
10µF 35V
Capacitor
0.1µF 50V
Capacitor
10µF 35V
Capacitor 0.01µF 16V
Capacitor 0.01µF 50V
Capacitor
0.1µF 50V
Capacitor
22µF 25V
Capacitor
10µF 35V
Capacitor
0.1µF 50V
Capacitor
0.1µF 50V
Capacitor 0.01µF 16V
Capacitor 0.01µF 16V
Capacitor 0.01µF 16V
Capacitor array 330pF x 4
Ceramic resonator (CST4.19MGW)
Diode (11ES1)
Diode (1SS270ATA)
Diode (1SS270ATA)
Diode (1SS270ATA)
Diode (1SS270ATA)
CABINET PARTS
CONTROL PANEL PARTS
36
R-930AK
R-930AW
REF. NO.
IC1
IC2
Q1
Q3
Q4
Q20-23
Q24-25
Q26
Q40
Q90
R2
R3
R4
R7-8
R10-11
R30
R31
R40
R50
R51
R62
R63
R64
R70-81
R90-93
R100
RY1-3
RY4-6
SP40
T1
VRS1
ZD2
ZD3
ZD4
3- 2
3- 2
3- 2-1
3- 2-1
3- 2-2
3- 2-2
3- 2-3
3- 3
3- 4
3- 5
3- 6
3- 7
PART NO.
RH-IZA797DRE0
RH-IZA495DRE0
VS2SB910MR/-4
VSKRA101M//-3
VSDTA123ES/-3
VSKRA101M//-3
VSKRA223M//-3
VSKRC243M//-3
VSKRA101M//-3
VSKRA101M//-3
VRD-B12HF471J
VRD-B12HF331J
VRD-B12HF751J
VRD-B12EF472J
VRS-B13AA180J
VRD-B12EF153J
VRD-B12EF472J
VRD-B12EF332J
VRD-B12EF153J
VRD-B12EF472J
VRN-B12EK753F
VRN-B12EK101F
VRN-B12EK222F
VRD-B12EF332J
VRD-B12EF104J
VRS-B13AA331J
RRLY-A083DRE0
RRLY-A078DRE0
RALM-A014DRE0
RTRNPA022DRE0
RH-VZA032DRE0
VHEHZ161///-1
VHEHZ5C2///-1
VHEHZ4A2///-1
DPNLCB438WRK0
DPNLCB439WRK0
FUNTKA815WRE0
FUNTKA816WRE0
JBTN-B059WRF0
JBTN-B060WRF0
MSPRCA050WRE0
LANGTA340WRW0
MLEVFA057WRW0
NSFTTA042WRE0
XEPSD30P10XS0
XCPSD40P12000
DESCRIPTION
LSI
IC
Transistor (2SB910M)
Transistor (KRA101M)
Transistor (DTA123E)
Transistor (KRA101M)
Transistor (KRA223M)
Transistor (KRC243M)
Transistor (KRA101M)
Transistor (KRA101M)
Resistor 470 ohm 1/2W
Resistor 330 ohm 1/2W
Resistor 750 ohm 1/2W
Resistor 4.7k ohm 1/4W
Resistor
18 ohm 1W
Resistor 15k ohm 1/4W
Resistor 4.7k ohm 1/4W
Resistor 3.3k ohm 1/4W
Resistor 15k ohm 1/4W
Resistor 4.7k ohm 1/4W
Resistor 75k ohm(F) 1/4W
Resistor 100 ohm(F) 1/4W
Resistor 2.2k ohm(F) 1/4W
Resistor 3.3k ohm 1/4W
Resistor 100k ohm 1/4W
Resistor 330 ohm 1W
Relay (OMIF-S-118LM)
Relay (OJ-SH-118LM)
Buzzer (PKM22EPT)
Transformer
Varistor (10G471K)
Zener diode (HZ16-1)
Zener diode (HZ5C-2)
Zener diode (HZ4A2)
Control panel frame with key unit [R-930AK]
Control panel frame with key unit [R-930AW]
Key unit [R-930AK]
Key unit [R-930AW]
Open button [R-930AK]
Open button [R-930AW]
Open button spring
Control panel back plate
Open lever
Open shaft
Screw ; control unit mtg.
Screw ; control panel back plate mtg.
4- 1
4- 2
4- 3
4- 4
4- 5
4- 6
4- 7
4- 8
4- 9
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
4-18
4-19
4-20
4-21
4-22
4-23
4-24
4-25
4-26
FOVN-A314WRY0
FROLPA072WRK0
NTNT-A019WRH0
FBRGMA002WRE0
PREFHA028WRW0
LANGTA196WRW0
LBNDK0054WRE0
LFIX-A013WRW0
NFANMA019WRW0
NPLYBA020WRF0
FDUC-A279WRK0
PFPF-A138WRE0
LANGKA723WRP0
PCUSUA167WRP0
PCUSUA424WRP0
FDUC-A322WRW0
MCAMPA030WRF0
NSFTTA114WRE0
FFTA-A034WRK0
PDUC-A269WRW0
PCUSGA398WRP0
NCPL-A021WRF0
PCOVPA301WRE0
PCUSUA197WRP0
PGLSPA455WRE0
PFPF-A139WRE0
Oven cavity assembly
Turntable support
Turntable tray
Bearing ass’y
Thermal protection plate (left)
Bearing mounting plate
Heater element holder
Bearing holder plate
Convection fan
Pulley (F)
Heater duct assembly
Thermal protection sheet (left)
Glass mounting plate
Cushion
Cushion
Steam duct assembly
Damper cam
Damper shaft
Damper door ass’y
Damper duct
Cushion
Turntable coupling
Waveguide cover
Cushion
Light glass
Thermal protection sheet (Right)
Q'TY
1
1
1
1
1
4
2
1
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
12
4
1
3
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
2
CODE
AX
AL
AE
AB
AA
AB
AB
AB
AB
AB
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AK
AG
AG
AN
AE
AA
AA
AA
BE
BE
BA
BA
AE
AE
AB
AK
AE
AE
AA
AA
1
1
1
1
1
1
2
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
2
1
1
BN
AL
AT
AQ
AR
AD
AB
AB
AE
AC
AT
AK
AE
AF
AG
BB
AC
AB
AM
AK
AC
AE
AE
AD
AD
AF
OVEN PARTS
37
R-930AK
R-930AW
REF. NO.
4-27
4-28
4-29
4-30
4-31
4-32
4-33
4-34
4-35
4-36
4-37
4-38
4-39
4-40
4-41
4-42
4-43
PART NO.
PREFHA053WRW0
PSKR-A153WRW0
PSKR-A323WRW0
LANGQA407WRW0
NPLYBA021WRF0
NFANJA020WRE0
PDUC-A270WRF0
LANGFA089WRW0
MHNG-A165WRM0
NBLTKA005WRE0
MLEVFA086WRE0
PCUSUA196WRP0
PCUSUA425WRP0
PCUSGA353WRP0
PSKR-A171WRW0
PFPF-A064WRE0
PHOK-A099WRF0
DESCRIPTION
Thermal protection plate (Right)
Air guide (Bottom)
Air guide (Right)
Convection motor mounting plate
Pulley (M)
Fan blade
Cooling fan duct
Chassis support
Oven hinge (Upper)
Convection fan belt
Actuator
Cushion
Damper duct cushion
Cushion
Magnetron air guide
Thermal protection sheet
Switch holder
5
5
5- 1
5- 2
5- 2
5- 3
5- 4
5- 4
5- 5
5- 6
5- 7
5- 8
5- 9
5-10
CDORFA769WRK0
CDORFA770WRK0
DDORFA820WRY0
PGLSPA499WRE0
PGLSPA500WRE0
GCOVHA155WRF0
GWAKPA492WRR0
GWAKPA494WRR0
LANGKA845WRW0
LANGKA851WRT0
LSTPPA169WRF0
MSPRTA081WRE0
XCPSD40P08000
XEPSD30P08XS0
Door panel assembly complete [R-930AK]
Door panel assembly complete [R-930AW]
Door panel
Door glass [R-930AK]
Door glass [R-930AW]
Choke cover
Door frame [R-930AK]
Door frame [R-930AW]
Glass bracket
Latch angle
Latch head
Latch head spring
Screw; 4mm x 8mm
Screw; 3mm x 8mm
6- 1
6- 2
6- 3
6- 4
6- 5
6- 6
6 -7
6- 8
6- 8
6- 9
6-10
6-11
FAMI-A088WRM0
FAMI-A087WRM0
TCADCA522WRR0
FW-VZB342WRE0
FW-VZB595WRE0
QW-QZA198WRE0
QW-VZA108WRE0
TSPCNC464WRR0
TSPCNC467WRR0
TCAUAA200WRR0
TCAUAA209WRR0
TINSEA710WRR0
Low rack (Broiling trivet)
High rack (Baking rack)
Cook book
Thermistor harness
Main wire harness
High voltage wire B
Grounding wire (Cooling fan motor)
Name plate [R-930AK]
Name plate [R-930AW]
Monitor caution label
DHHS caution label
Operation manual
7- 1
7- 2
7- 2
7- 3
7- 4
7- 5
7- 6
7- 7
7- 8
7- 9
7-10
7-11
7-12
7-13
7-14
7-15
7-16
7-17
7-18
7-19
7-20
7-21
7-22
7-23
XOTWW40P10000
XOTSE40P12000
XOTSF40P12000
XCTWW40P08000
XHTSD40P08RV0
LX-CZ0052WRE0
XWVSD60-07000
LX-WZA004WRE0
LX-CZA020WRE0
XBPSD30P14K00
XBPSD40P25000
XBTWW40P06000
XCTSD40P08000
XCPSD40P10000
XBPSD40P06KS0
LX-WZA022WRE0
XCPSD40P08000
XCPSD30P06000
LX-CZA038WRE0
XFPSD40P08K00
XHTSD40R12RV0
XCBWW30P06000
XFPSD40P08000
XFPSD60P14JS0
Screw; 4mm x 10mm
Screw; 4mm x 12mm [R-930AW]
Screw; 4mm x 12mm [R-930AK]
Screw; 4mm x 8mm
Screw; 4mm x 8mm
Special screw
Washer; 6mm x 0.7 mm
Washer
Special screw
Screw; 3mm x 14mm
Screw; 4mm x 25mm
Screw; 4mm x 6mm
Screw; 4mm x 8mm
Screw; 4mm x 10mm
Screw; 4mm x 6mm
Washer
Screw; 4mm x 8mm
Screw; 3mm x 6mm
Special screw
Screw; 4mm x 8mm
Screw; 4mm x 12mm
Screw; 3mm x 6mm
Screw; 4mm x 8mm
Screw; 6mm x 14mm
Q'TY
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
CODE
AP
AK
AF
AG
AC
AE
AL
AE
AE
AF
AD
AD
AG
AH
AE
AF
AP
1
1
1
1
1
1
1
1
2
1
1
1
2
16
BT
BT
BD
AN
AN
AP
AZ
AZ
AF
AF
AH
AA
AA
AA
1
1
1
1
1
1
1
1
1
1
1
1
AW
AW
BA
AN
BA
AN
AF
AE
AE
AB
AD
AH
14
4
4
2
1
2
1
1
6
1
2
7
7
1
2
1
6
3
1
2
1
4
6
2
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AB
AA
AA
AA
AA
AA
AA
AA
AB
DOOR PARTS
MISCELLANEOUS
SCREWS NUTS AND WASHERS
38
R-930AK
R-930AW
REF. NO.
7-24
7-25
7-26
7-27
7-28
PART NO.
XOTSD40P12000
XFPSD30P08000
XNESD40-32000
XNEUW40-32000
XWSUW40-10000
DESCRIPTION
Q'TY
22
2
2
1
1
Screw; 4mm x 12mm
Screw; 3mm x 8mm
Nut; 4mm x 3.2mm
Nut; 4mm x 3.2mm
Washer; 4mm x 1 mm
CODE
AA
AA
AA
AA
AA
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER
3. 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.
PACKING AND ACCESSORIES
TRAY HOLDER
(SPADFA348WRE0)
TOP PAD ASSEMBLY
FPADBA358WRK0
DOOR PROTECTION SHEET
4-3 TURNTABLE TRAY
SPADPA178WRE0
PLASTIC BAG
SSAKHA012WRE0
6-11 OPERATION
MANUAL
6-3 COOK BOOK
MICROWAVE OVEN
CABINET COVER (R-930AK)
4-2 TURNTABLE SUPPORT
SPADPA507WRE0
BOTTOM PAD ASSEMBLY
FPADBA359WRK0
TRAY PACKING FOAM
PACKING CASE
SPADPA198WRE0
SPAKCC905WRE0 (R-930AK)
Not replaceable items.
39
SPAKCC909WRE0 (R-930AW)
H
1
2
4-31
1-5
7-21
3
40
4-2
4-3
4-23
TO OVEN
BASE PLATE
1-13
7-11
4-9
7-11
6-8
4
5
2-3-2
2-3-1
7-5
2-10
A
1-7
2-4
x4
2-7
7-19
1-4
1-6
4-21
2-9
7-22
x4
x4
7-24
1-2
7-13
1-3
1-18
2-6
7-24
x2
4-26
4-38
4-14
1-17
7-2
4-27
1-19
7-4
4-40
1-16
7-6
7-23
4-18
6-7
7-20
6-10
1-9
4-39
1-1
4-17
7-10
2-5
7-24
7-24
7-17
7-16
1-6
7-9
4-20
1-14
4-41
4-19
7-16
7-26
7-2
1-4
4-33
2-2
4-43
4-15
A
7-19
1-4
4-37
4-32
7-2
7-18
4
7-24
7-8
x3
7-22
4-28
1-20
6-4
7-7
7-16
7-16
6-7
7-12
4-42
6-9
B
2-8
7-1
7-1
4-29
7-22
4-16
7-16
7-24
7-24 x 6
3
2-3
4-38
7-28
x3
4-24
7-8
4-35
4-1
7-27
7-21
1-15
4-22
7-21
1-21
4-25
4-34
2
4-30
7-24
7-14
4-14
4-7
4-11
F
7-1
1-8
7-15
4-12
4-13
D
7-13
x3
4-24
1-11
A
7-17
4-6
7-1
x3
1-10
E
4-4
7-25
1
4-36
4-10
4-8
G
4-5
2-1
C
7-3
7-24
R-930AK
R-930AW
5
6
OVEN AND CABINET PARTS
A
B
C
D
E
F
G
H
6
R-930AK
R-930AW
2
1
4
3
6
5
CONTROL PANEL PARTS
3-7
3-3
A
3-1
3-2
x2
A
3-6
x3
3-4
7-24
3-2-1
B
B
3-5
C
C
7-24
3-2-3
5
5-3
D
D
3-2-2
5-10
DOOR PARTS
5-10
5-1
E
E
5-5
5-2
5-10
5-6
F
F
5-7
5-9
5-5
5-4
G
5-8
MISCELLANEOUS
G
6-1
6-5
6-4
6-2
H
H
Actual wire harness may be different than illustration.
6-6
1
6-7
2
4
3
41
5
6
R-930AK
R-930AW
'97 SHARP CORP. (6K2.770E) Printed in U.S.A
42