R-930AK-F
SMART & EASY
R-930AW-F
CONVECTION
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4 F
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5
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6
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7 Ba
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8 Fish
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1 H
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2 Chicken piec
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3 S
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4
Fish
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1
Chicken
2
Turkey
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Turke
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Bundt cake
2 C
ookies
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rench frie
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SLOW
LOW M
IX
HIGH M
COOK
BAKE
1 2345
100˚F
150˚F
275˚F 300˚F
6 7890
350˚F
375˚F
400˚F 425˚F
KITCHEN
CLOCK
TIMER
POWER
START
LEVEL
TOUCH ON
R-930AK-F
R-930AW-F
SERVICE MANUAL
SY526R930APWF
CONVECTION
MICROWAVE OVEN
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325˚F
150˚F
ST OP
TCLEAR
MODELS
R-930AK-F
R-930AW-F
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.
WARNING TO SERVICE PERSONNEL: Microwave ovens contain
circuitry capable of producing very high voltage and current,
contact with following parts may result in a severe, possibly fatal,
electrical shock. (High Voltage Capacitor, High Voltage Power
Transformer, Magnetron, High Voltage Rectifier Assembly, High
Voltage Harness etc..)
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 ......................................................................................................INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................ 1
MICROWAVE MEASUREMENT PROCEDURE ................................................................................................... 2
FOREWORD AND WARNING ............................................................................................................................... 3
PRODUCT SPECIFICATIONS .............................................................................................................................. 4
GENERAL INFORMATION ................................................................................................................................... 4
OPERATION .......................................................................................................................................................... 6
TROUBLESHOOTING GUIDE ............................................................................................................................ 12
TEST PROCEDURE ............................................................................................................................................ 14
TOUCH CONTROL PANEL ................................................................................................................................. 24
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 31
PICTORIAL DIAGRAM ........................................................................................................................................ 38
CONTROL PANEL CIRCUIT ............................................................................................................................... 39
PRINTED WIRING BOARD ................................................................................................................................. 40
PARTS LIST ........................................................................................................................................................ 41
PACKING AND ACCESSORIES ......................................................................................................................... 44
SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-930AK-F
R-930AW-F
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal
and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches,
(5) evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation
and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual
before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be
performed on each oven prior to release to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave
Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS
CORPORATION immediately @1-800-237-4277.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven
and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's
Center for Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found
with emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unit
until the oven has been brought into compliance.
WARNING TO SERVICE PERSONNEL
Don't Touch !
Danger High Voltage
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with
following parts
fatal, electrical shock.
(Example)
High Voltage Capacitor, High Voltage Power Trans-
former, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
may result in a severe, possibly
R-930AK-F
R-930AW-F
Before Servicing
1. Disconnect the power supply cord , and then
remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
The high-voltage capacitor remains charged about 60 seconds after the oven has been switched off. Wait for 60
seconds and then short-circuit the connection of the highvoltage capacitor (that is the connecting lead of the highvoltage rectifier) against the chassis with the use of an
insulated screwdriver.
Whenever troubleshooting is performed the power supply
must be disconnected. It may, in some cases, be necessary to
connect the power supply after the outer case has been
removed, in this event,
1. Disconnect the power supply cord, and then remove outer
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that the leads remain isolated from other components
and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is
installed.
7. Run the oven and check all functions.
After repairing
1. Reconnect all leads removed from components during
testing.
2. Reinstall the outer case (cabinet).
3. Reconnect the power supply cord after the outer case is
installed.
4. Run the oven and check all functions.
Microwave ovens should not be run empty. To test for the
presence of microwave energy within a cavity, place a cup of
cold water on the oven turntable, close the door and set the
power to HIGH and set the microwave timer for two (2) minutes.
When the two minutes has elapsed (timer at zero) carefully
check that the water is now hot. If the water remains cold carry
out Before Servicing procedure and re-examine the connections to the component being tested.
When all service work is completed and the oven is fully
assembled, the microwave power output should be checked
and a microwave leakage test should be carried out.
When the testing is completed,
1. Disconnect the power supply cord, and then remove outer
1
R-930AK-F
R-930AW-F
MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should
not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a
purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external surface
of the oven.
2) Safety interlock switches Primary interlock relay and door sensing switch shall prevent microwave radiation emission in excess
of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission in excess of
5 mW/cm2 at any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for microwave
ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5˚C (68˚F) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.) and made
of an electrically nonconductive material such as glass or plastic.
The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage is
measured accurately.
4) Set the cooking control on Full Power Cooking Mode.
5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed, replace
it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement)
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on the meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal has
been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed latch
assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2, and that
the secondary interlock switch does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.
2
SERVICE MANUAL
CONVECTION
MICROWAVE OVEN
R-930AK-F/ R-930AW-F
FOREWORD
PRODUCT DESCRIPTION
GENERAL INFORMATION
R-930AK-F
R-930AW-F
This Manual has been prepared to provide Sharp Electronics Corp.
Service Personnel with Operation and Service Information for the SHARP
CONVECTION MICROWAVE OVEN, R-930AK-F and R-930AW-F.
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.
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is no other visible damage with the oven.
Servicing and repair work must be carried out only by trained service
personnel.
DANGER
Certain initial parts are intentionally not grounded and present
a risk of electrical shock only during servicing. Service personnel - Do not contact the following parts while the appliance is
energized;
High Voltage Capacitor, Power Transformer, Magnetron, High
Voltage Rectifier Assembly, High Voltage Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.
OPERATION
TROUBLESHOOTING GUIDE
AND TEST PROCEDURE
TOUCH CONTROL PANEL
COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
WIRING DIAGRAM
PARTS LIST
All the parts marked “*” on parts list are used at voltages more than
250V.
Removal of the outer wrap gives access to voltage above 250V.
All the parts marked “∆” on parts list may cause undue microwave
exposure, by themselves, or when they are damaged, loosened or
removed.
SHARP ELECTRONICS CORPORATION
SHARP PLAZA, MAHWAH,
NEW JERSEY 07430-2135
3
R-930AK-F
R-930AW-F
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 Test Procedure)
Operating frequency of 2450MHz
Convection Power Output 1450 Watts
Outside Dimensions Width 24-5/8" Height 14-7/8" Depth 19-1/8"
Cooking Cavity Dimensions Width 16-1/8"
(1.5 Cubic Feet ) Height 9-5/8"
Depth 16-1/8"
Control Complement 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
NOTE: Internal capacity is calculated by measuring
maximum width, depth and height.
Actual capacity for holding food is less.
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.
4
R-930AK-F
3-Pronged Plug
Grounded
Receptacle Box
Grounding Pin
3-Pronged Receptacle
R-930AW-F
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.
CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS
PLUG.
OVEN DIAGRAM
1
7
3
10
5
12
TOUCH CONTROL PANEL
MIX CONV
DEFROST
SENSOR
COOK LBS OZ KG HELP
9
Interactive
13
8
15
11 6
2
6
1. Ventilation openings. (Rear side)
2. Oven door with see-through window.
3. Oven lamp.
4. Turntable support.
5. Removable turntable.
The turntable will rotate clockwise or
counterclockwise.
6. Safety door latches.
The oven will not operate unless the door is
securely closed.
7. Waveguide cover.
8. Door open button.
9. Auto-Touch control panel.
10. Lighted digital display.
11. Convection air openings.
12. Removable low rack. (Broiling trivet)
13. Removable high rack. (Baking rack)
14. Power supply cord.
15. Turntable motor shaft.
14
4
SENSOR
REHEAT
POPCORN
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
Convection
1 Hamburgers
2 Chicken pieces
3 Steaks
4 Fish steaks
1 Chicken
2 Turkey
3 Turkey breast
4 Pork
1 Bundt cake
2 Cookies
3 Muffins
4 French fries
CUSTOM
HELP
MINUTE
PLUS
COMPU
DEFROST
SENSOR
COOKT
COMPU
BROIL
COMPU
ROAST
COMPU
BAKE
PREHEAT CONVEC BROIL
NOTE: Some one-touch cooking features such as "MINUTE PLUS"
are disabled after one minute when the oven is not in use.
These features are automatically enabled when the door is
opened and closed or the STOP/ CLEAR pad is pressed.
5
SLOW
COOK
1 2345
100˚F 150˚F 275˚F 300˚F 325˚F
6 7890
350˚F 375˚F 400˚F 425˚F 450˚F
KITCHEN
TIMER
LOW MIX
BAKE
CLOCK
POWER
LEVEL
HIGH MIX
ROAST
ST OP
CLEAR
START
TOUCH ON
R-930AK-F
R-930AW-F
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions during
oven operation.
OFF CONDITION
Closing the door activates the door sensing switch and secondary interlock switch. (In this condition, the monitor switch
contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the noise
filter and 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 shutoff relay (RY-4). RY4 contacts close, completing a circuit to
the damper motor. The damper motor now operates moving
the damper to the open position, thereby closing the contacts
of the damper switch inputs a signal to the control unit. The
coil of relay RY-4 is de-energized, opening its contacts,
thereby turning off the damper motor.
COOKING CONDITION
Program desired cooking time Variable Cooking Control by
touching the NUMBER pads and the power level pad. When
the START pad is touched, the following operations occur:
1. The contacts of relays are closed and components connected
to the relays are turned on as follows.
(For details, refer to Figure O-2)
RELAY CONNECTED COMPONENTS
RY-1 Oven lamp/Turntable motor
RY-2 Power transformer
RY-6 Fan motor
2. 120 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3 volts A.C.
output on the filament winding, and approximately 2360
volts A.C. on the high voltage winding.
3. The filament winding voltage heats the magnetron filament
and the H.V. winding voltage is sent to a voltage doubler
circuit.
4. The microwave energy produced by the magnetron is
channelled through the waveguide into the cavity feed-box,
and then into the cavity where the food is placed to be
cooked.
5. Upon completion of the cooking time, the power transformer,
oven lamp, etc. are turned off, and the generation of
microwave energy is stopped. The oven will revert to the
OFF condition.
6. When the door is opened during a cook cycle, monitor
switch, door sensing switch, the primary interlock relay and
the secondary interlock switch are activated with the following
results. The circuits to the turntable motor, the cooling fan
motor, and the high voltage components are de-energized,
the oven lamp remains on, and the digital read-out displays
the time still remaining in the cook cycle when the door was
opened.
7. The monitor switch is electrically monitoring the operation
of the primary interlock relay and the secondary interlock
switch and is mechanically associated with the door so that
it will function in the following sequence.
(1) When the door opens from a closed position, the primary
interlock relay and the secondary interlock switch open their
contacts, and then the monitor switch contacts close.
(2) When the door is closed from the open position, the monitor
switch contacts first open, and then the contacts of the
primary interlock relay and the secondary interlock switch
close.
If the primary interlock relay and the secondary interlock switch
fail with their contacts closed when the door is opened, the
closing of the monitor switch contacts will form a short circuit
through the monitor fuse, primary interlock relay and the
secondary interlock switch, causing the monitor fuse to blow.
POWER LEVEL P-0 TO P-90 COOKING
When Variable Cooking Power is programmed, the 120
volts A.C. is supplied to the power transformer intermittently
through the contacts of relay (RY-2). RY-2 is operated by
the control unit within an varying time base. Microwave
power operation is as follows:
VARI-MODE ON TIME OFF TIME
Power 10(P-HI) (100% power) 32 sec. 0 sec.
Power 9(P-90) (approx. 90% power) 30 sec. 2 sec.
Power 8(P-80) (approx. 80% power) 26 sec. 6 sec.
Power 7(P-70) (approx. 70% power) 24 sec. 8 sec.
Power 6(P-60) (approx. 60% power) 22 sec. 10 sec.
Power 5(P-50) (approx. 50% power) 18 sec. 14 sec.
Power 4(P-40) (approx. 40% power) 16 sec. 16 sec.
Power 3(P-30) (approx. 30% power) 12 sec. 20 sec.
Power 2(P-20) (approx. 20% power) 8 sec. 24 sec.
Power 1(P-10)(approx. 10% power) 6 sec. 26 sec.
Power 0(P-0) (0% power) 0 sec. 32 sec.
Note: The ON/OFF time ratio does not correspond with
the percentage of microwave power, because
approx. 2 seconds are needed for heating of the
magnetron filament.
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.
6
R-930AK-F
12 SEC. 20 SEC.
32 SEC.
LOW MIX
BAKE
HIGH MIX
ROAST
MICROWAVE POWER
= APPROX. 30%
CONVECTION
TEMPERATUE
= 300˚F
MICROWAVE POWER
= APPROX. 10%
CONVECTION
TEMPERATUE
= 350˚F (180˚C)
26 SEC.6 SEC.
ON
ON
OFF
OFF
OFF
ON
(MICRO.)
(CONVEC.)
(MICRO.)
(CONVEC.)
MICROWAVE
MICROWAVE
AH SENSOR
R-930AW-F
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 shutdown completely after 30 minutes
CONVECTION COOKING CONDITION
When the preheat temperature is reached, a beep signal will
sound indicating that the holding temperature has been reached
in the oven cavity. Open the door and place the food to be
cooked in the oven. Touch the CONVEC pad first and then
touch the Temperature pad. And program desired cooking time
by touching the Number pads. When the START pad is
touched, the following operations occur:
1. The numbers on the digital read-out start to count down to
zero.
2. The oven lamp, turntable motor, cooling fan motor and
convection motor are energized.
3. Heater relay (RY3) is energized (if the cavity temperature
is lower than the selected temperature) and the main supply
voltage is applied to the heating element to return to the
selected cooking temperature.
4. Upon completion of the cooking time, the audible signal will
sound, and oven lamp, turntable motor, cooling fan motor and
convection motor are de-energized. At the end of the
convection cycle, if the cavity air temperature is above 275˚F,
the circuit to RY6 will be maintained (by the thermistor circuit)
to continue operation of the cooling fan motor until the
temperature drops below 245˚F, at which time the relay will be
de-energized, turning off the fan motor. Relay RY5 will
however, open as soon as the convection cycle has ended,
turning off the convection fan motor.
5. At the end of the convection cook cycle, shut-off relay (RY4)
is energized turning on the damper motor. The damper is
returned to the open position, closing the damper switch
contacts which send a signal to the control unit, de-energizing
shut-off relay (RY4).
AUTOMATIC MIX COOKING CONDITION
Touch the HIGH MIX/ROAST or the LOW MIX/BAKE pad first.
And then program desired cooking time by touching the Number
pads. The LOW MIX/BAKE pad is preprogrammed for 350˚F
with 10% microwave power, while the HIGH MIX/ROAST pad
is preprogrammed for 300˚F with 30% microwave power.
When the START pad is touched, the following operations
occur:
1. The numbers on the digital read-out start to count down to
zero.
2. The shut-off relays (RY1,RY2,RY3,RY5 and RY6) are
energized, turning on the oven lamp, turntable motor,
cooling fan motor and convection fan motor.
3. The shut-off relay (RY4) is energized.
The damper door is closed from the open position.
4. The heater relay (RY3) is energized, applying the main
supply voltage to the heating element.
5. Now, the oven is in the convection cooking condition.
6. When the oven temperature reaches the selected
temperature, the following operations occur:
6-1. The power supply voltage is alternated to the heating
element and power transformer.
6-2. The heating element operates through the heater relay
(RY3) contacts and the power transformer operates
through the primary interlock relay (RY2) contacts.
6-3. These are operated by the control unit to supply
alternately within a 32 second time base, convection
heat and microwave energy.
The relationship between the convection and microwave power
operations are as follows.
Note: The ON and OFF time ratio does not correspond
with the percentage of microwave power, because
approx. 2 seconds are needed for heating of the
magnetron filament.
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. 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.
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.
7
R-930AK-F
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Cooking Sequence.
1. Touch SENSOR COOK pad.
NOTE: The oven should not be operated on SENSOR
COOK immediately after plugging in the unit. Wait
two minutes before cooking on SENSOR COOK.
2. Select desired Sensor setting.
3. Touch START pad.
The coil of shut-off relay (RY1, RY6) is energized, the oven
lamp and cooling fan motor are turned on, but the power
transformer is not turned on.
4. After about 16 seconds, the cook relay (RY-2) is energized.
The power transformer is turned on, microwave energy is
produced and first stage is started. The 16 seconds is the
cooling time required to remove any vapor from the oven
cavity and sensor.
NOTE: During this first stage, do not open the door or touch
STOP/CLEAR pad.
5. When the sensor detects the vapor emitted from the food,
the display switches over to the remaining cooking time and
the timer counts down to zero. At this time, the door may be
opened to stir food, turn it or season, etc.
6. When the timer reaches zero, an audible signal sounds.
The shut-off relay and cook relay are de-energized and the
power transformer, oven lamp, etc. are turned off.
7. Opening the door or touching the STOP/CLEAR pad, the
time of day will reappear on the display and the oven will
revert to an OFF condition.
COMPU BROIL/ COMPU ROAST/ COMPU BAKE
COMPU BROIL/ ROAST/ BAKE will automatically compute the
oven temperature, microwave power and cooking time for baking, roasting and broiling. Set the desired program by touching
the COMPU BROIL/ ROAST/ BAKE pad, and number pad. Enter
the weight by touching the Number pads. When the START pad
is touched, the following operations occur:
1. The COOK indicator will light and the Convection Fan
Symbol will rotate.
2. The cooking time will appear on the display and start
counting down to zero. The cooking time is adjusted
automatically according to the weight of the food.
3. The shut-off relays (RY1, RY5 and RY6) are energized,
turning on the oven lamp, turntable motor, cooling fan motor
and convection motor. The power supply voltage is applied
to the heating element.
4. Now, the oven is in the convection cooking mode.
5. When the oven temperature has reached the programmed
convection temperature, the oven goes into the programmed
cooking mode.
6. At the end of the COMPU BROIL/ ROAST/ BAKE cycle, the
damper is returned to the open position and the oven will go
to the off condition. The cooling fan will remain on until the
oven has cooled.
COMPU DEFROST COOKING
The COMPU DEFROST key is a special function key to defrost
meats and poultry faster and better. COMPU DEFROST automatically defrosts roast beef, etc.. When the COMPU DEFROST is selected and the food weight is entered by using the
COMPU DEFROST pad, the oven will cook according to the
special cooking sequence.
FIRE SENSING FEATURE (MICROWAVE MODE)
This model incorporates a sensing feature which will stop the
oven's operation if there is a fire in the oven cavity during
microwave cooking. This is accomplished by the LSI repeatedly measuring the voltage across the temperature measurement circuit (thermistor) during it's 32-seconds time base
comparing the obtained voltage measurements. If the most
recent voltage measured is 300mV greater than the previous
voltage measured, the LSI judges it as a fire in the oven cavity
and switches off the relays to the power transformer, fan motor
and convection motor. The LSI also stops counting down and
closes the damper door so that no fresh air will enter the oven
cavity. Please refer to the following section for a more detailed
description.
Operation
Please refer to the timing diagrams below.
1. The thermistor operates within a 32-seconds time base and
it is energized for three (3) seconds and off for 29 seconds.
Two (2) seconds after the thermistor is energized, the
voltage across the temperature measurement circuit is
sampled by the LSI and twenty one (21) seconds after the
thermistor is cut off the LSI turns on the cooling fan for six
(6) seconds.
2. The above procedure is repeated. If the difference between
the first voltage measured (in step 1) and the voltage measured
when the procedure is repeated (step 2) is greater than
300mV the LSI makes the judgment that there is a fire in the
oven cavity and will switch off the relays to the power
transformer, fan motor and convection motor. The LSI also
stops counting down and closes the damper door so that no
fresh air will enter the oven cavity.
3. Once the fire sensor feature has shut the unit down, the
programmed cooking cycle may be resumed by pressing
the "START" pad or the unit may be reset by pressing the
"CLEAR" pad.
3
02 24 30 64 (sec.)
CONVECTION
THERMISTOR
MOTOR
Sensing
Voltage
ON
OFF
ON
OFF
ON
OFF
3 sec.
Sensing the voltage across the temperature measurement circuit.
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.
6 sec.
32 (sec.)
8
SCHEMATIC DIAGRAM
R-930AK-F
R-930AW-F
NOTE: CONDITION OF OVEN
SCHEMATIC
1. DOOR CLOSED.
2. CLOCK APPEARS ON DISPLAY.
NOISE FILTER
LN
FUSE
20A
CAPACITOR
LINE BYPASS
0.0033µF / AC 125V
CAPACITOR
LINE BYPASS
0.0033µF / AC 125V
SECONDARY
INTERLOCK
SWITCH
120V AC
60 Hz
GRN
0.22µF / AC 250V
LINE CROSS CAPACITOR
NOISE SUPPRESSION COIL
CONV.
THERMAL
CUT-OUT
TTM
TURNTABLE MOTOR
MAGNETRON
TEMPERATURE
FUSE
COM.
FM
OL
OVEN LAMP
FAN MOTOR
DM
CM
A-7
DAMPER MOTOR
CONVECTION MOTOR
A-9
A-1
CONTROL UNIT
AH SENSOR
RY4
A-3
DOOR
SENSING
SWITCH
RY5
RY3
(RY1)
A-5
RY6
RY1
RY2
RY2
PRIMARY
INTERLOCK
RELAY
E-5E-4E-3E-2E-1F-3F-2F-1
E-6
THER-
DAMPER
MISTOR
SWITCH
Figure O-1. Oven Schematic-OFF Condition
N.O.
(RY1)
COM.
(RY3)
COM.
(RY2)
N.O.
(RY2)
N.O.
(RY3)
MONITOR SWITCH
HEATIMG ELEMENT
POWER
TRANSFORMER
CAPACITOR
0.94µ
MAGNETRON
H.V. RECTIFIER
1. DOOR CLOSED.
SCHEMATIC
2. COOKING TIME PROGRAMMED.
3. “START” PAD TOUCHED.
NOISE FILTER
LN
FUSE
20A
CAPACITOR
LINE BYPASS
0.0033µF / AC 125V
CAPACITOR
LINE BYPASS
0.0033µF / AC 125V
SECONDARY
INTERLOCK
SWITCH
120V AC
60 Hz
GRN
0.22µF / AC 250V
LINE CROSS CAPACITOR
NOISE SUPPRESSION COIL
CONV.
THERMAL
CUT-OUT
MAGNETRON
TEMPERATURE
FUSE
FM
TTM
TURNTABLE MOTOR
OL
OVEN LAMP
FAN MOTOR
CM
CONVECTION MOTOR
DM
A-7
DAMPER MOTOR
A-9
A-1
CONTROL UNIT
AH SENSOR
RY4
A-3
DOOR
SENSING
SWITCH
RY5
RY3
COM.
(RY1)
A-5
RY6
THERMISTOR
RY2
RY1
RY2
PRIMARY
INTERLOCK
RELAY
E-5E-4E-3E-2E-1F-3F-2F-1
E-6
DAMPER
SWITCH
N.O.
(RY1)
COM.
(RY3)
COM.
(RY2)
N.O.
(RY2)
N.O.
(RY3)
Figure O-2. Oven Schematic-Microwave Cooking Condition
MONITOR SWITCH
HEATIMG ELEMENT
POWER
TRANSFORMER
CAPACITOR
0.94µ
MAGNETRON
H.V. RECTIFIER
9
R-930AK-F
R-930AW-F
1. DOOR CLOSED.
SCHEMATIC
2. MIX COOKING PAD TOUCHED.
3. COOKING TIME PROGRAMMED.
4. “START” PAD TOUCHED.
5. RY2 AND RY3 WILL ALTERNATELY CLOSE.
DURING COOK CYCLE.
MAGNETRON
TEMPERATURE
FUSE
TTM
OL
OVEN LAMP
TURNTABLE MOTOR
120V AC
60 Hz
GRN
LN
FUSE
20A
NOISE FILTER
0.22µF / AC 250V
LINE CROSS CAPACITOR
NOISE SUPPRESSION COIL
CAPACITOR
LINE BYPASS
0.0033µF / AC 125V
CAPACITOR
LINE BYPASS
0.0033µF / AC 125V
SECONDARY
INTERLOCK
SWITCH
CONV.
THERMAL
CUT-OUT
Figure O-3. Oven Schematic-Automatic Mix Cooking Condition
FM
DM
CM
FAN MOTOR
DAMPER MOTOR
CONVECTION MOTOR
A-7
A-9
CONTROL UNIT
AH SENSOR
COM.
A-3
A-1
RY4
RY5
RY3
DOOR
SENSING
SWITCH
(RY1)
A-5
RY6
THERMISTOR
RY2
RY1
RY2
PRIMARY
INTERLOCK
RELAY
E-5E-4E-3E-2E-1F-3F-2F-1
E-6
DAMPER
SWITCH
N.O.
(RY1)
COM.
(RY3)
COM.
(RY2)
N.O.
(RY2)
N.O.
(RY3)
HEATIMG ELEMENT
POWER
TRANSFORMER
MONITOR SWITCH
CAPACITOR
0.94µ
MAGNETRON
H.V. RECTIFIER
1. DOOR CLOSED.
SCHEMATIC
2. CONVECTION PAD TOUCHED.
3. DESIRED TEMP. TOUCHED.
4. COOKING TIME PROGRAMMED.
5. “START” PAD TOUCHED.
NOISE FILTER
LN
FUSE
20A
CAPACITOR
LINE BYPASS
0.0033µF / AC 125V
CAPACITOR
LINE BYPASS
0.0033µF / AC 125V
120V AC
60 Hz
GRN
0.22µF / AC 250V
LINE CROSS CAPACITOR
NOISE SUPPRESSION COIL
CONV.
THERMAL
CUT-OUT
SECONDARY
INTERLOCK
SWITCH
MAGNETRON
TEMPERATURE
FUSE
FM
TTM
TURNTABLE MOTOR
OL
OVEN LAMP
FAN MOTOR
CM
CONVECTION MOTOR
DM
A-7
DAMPER MOTOR
A-9
A-1
CONTROL UNIT
AH SENSOR
RY4
A-3
DOOR
SENSING
SWITCH
RY5
RY3
COM.
(RY1)
A-5
RY6
THERMISTOR
RY2
RY1
RY2
PRIMARY
INTERLOCK
RELAY
E-6
E-5E-4E-3E-2E-1F-3F-2F-1
DAMPER
SWITCH
N.O.
(RY1)
COM.
(RY3)
COM.
(RY2)
N.O.
(RY2)
N.O.
(RY3)
Figure O-4. Oven Schematic-Convection Cooking Condition
MONITOR SWITCH
HEATIMG ELEMENT
POWER
TRANSFORMER
CAPACITOR
0.94µ
MAGNETRON
H.V. RECTIFIER
DESCRIPTION AND FUNCTION OF COMPONENTS
DOOR SENSING AND SECONDARY INTERLOCK
SWITCHES
The door sensing switch in the primary interlock system is
mounted in the upper position on the latch hook, the secondary
interlock switch is mounted in the lower position on the latch hook.
They are activated by the latch heads on the door. When the door
is opened, the switches interrupt the circuit to all components. A
cook cycle cannot take place until the door is firmly closed thereby
10
R-930AK-F
R-930AW-F
activating both interlock switches. The primary interlock system
consists of the door sensing switch and primary interlock relay
located on the control circuit board.
LATCH HOOK
DOOR SENSING
SWITCH
LATCH
HEADS
DOOR OPEN
DOOR OPEN
BUTTON
BUTTON
MONITOR SWITCH
SECONDARY
INTERLOCK SWITCH
SWITCH LEVER
OPEN LEVER
Figure D-1. Door sensing switch, monitor switch and
secondary interlock switches
MONITOR SWITCH
The monitor switch is mounted on the middle position of latch
hook. It is activated (the contacts opened) by the lower latch head
while the door is closed. The switch is intended to render the oven
inoperative by means of blowing the monitor fuse when the
contacts of the primary interlock relay and secondary interlock
switch fail to open when the door is opened.
Functions:
1. When the door is opened, the monitor switch contact close
(to the ON condition) due to their being normally closed. At
this time the door sensing and secondary interlock switches
are in the OFF condition (contacts open) due to their being
normally open contact switches.
2. As the door goes to a closed position, the monitor switch
contacts are first opened and then the door sensing switch
and the secondary interlock switch contacts close. (On opening
the door, each of these switches operate inversely.)
3. If the door is opened, and the primary interlock relay and
secondary interlock switch contacts fail to open, the monitor
fuse blows simultaneously with closing of the monitor
switch contacts.
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE TEST THE DOOR SENSING SWITCH,
PRIMARY INTERLOCK RELAY, SECONDARY
INTERLOCK SWITCH AND MONITOR SWITCH
FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”).
NOTE: MONITOR FUSE AND MONITOR SWITCH ARE
REPLACED AS AN ASSEMBLY.
THERMISTOR
The thermistor is a negative temperature coefficient type. The
temperature in the oven cavity is detected through the resistance of the thermistor, and then the control unit causes the
heater relay to operate, thus the current to the heating element
is turned ON/OFF.
MAGNETRON TEMPERATURE FUSE.
The temperature fuse located on the waveguide is designed to
prevent damage to the magnetron if an over heated condition
develops in the magnetron 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).
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.
NOISE FILER
The noise filter prevents the radio frequency interference that
might flow back in the power circuit. .
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
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.
Microwave Cooking:
Damper is in the open position, because a portion of cooling air
11
R-930AK-F
DAMPER DUCT
DAMPER
DAMPER CAM
DAMPER MOTOR
DAMPER SWITCH
DAMPER SHAFT
R-930AW-F
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 is in the closed position, so that no hot air will be
allowed to leak out the oven cavity.
Damper Operation
1. When power supply cord is plugged in:
1-1. When power supply cord is plugged in, a signal is
sensed in the control unit, and operates shut-off relay
(RY4).
1-2. Contacts of shut-off relay (RY4) close, the damper
motor is energized, opening the damper door.
1-3. When the damper is moved to the open position by the
damper cam the damper switch is closed (ON position).
1-4. The signal from damper switch is re-sensed in the
control unit and shut-off relay (RY4) is turned off.
1-5. The 120 volts A.C. to the damper motor is removed
and the motor turns off.
2. When oven is microwave cooking:
Damper is in the open position.
3. When oven is convection cooking:
3-1. Damper motor is energized by touching the convection,
temperature and START pads.
3-2. When damper is in the closed position (damper switch
is OFF), its signal is sensed by the control unit, and
shut-off relay (RY4) is de-energized.
3-3. The damper is held in the closed position during the
convection cooking operation.
3-4. At the end of the convection cooking, shut-off relay
(RY4) is energized, and the damper is returned to the
open position.
NOTE: If the damper door is not in the proper position,
closed during convection or open during microwave,
the control unit will stop oven operation after 1
minute.
Figure D-2. Damper Mechanism
TROUBLESHOOTING GUIDE
Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.
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, relay (RY1) primary
interlock relay (RY2), door sensing switch and secondary interlock switch before replacing the monitor fuse. If the
monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA021WRK0 as an assembly.
IMPORTANT: Whenever troubleshooting is performed with the power supply cord disconnected. It may in, some cases, be
necessary to connect the power supply cord after the outer case has been removed, in this event,
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
When the testing is completed
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect all leads removed from components during testing.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
12
R-930AK-F
R-930AW-F
CONDITION
TEST PROCEDURE
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
A MAGNETRON
B POWER TRANSFORMER
C H.V. RECTIFIER ASSEMBLY
D HIGH VOLTAGE CAPACITOR
E SECONDARY INTERLOCK SWITCH
F PRIMARY INTERLOCK SYSTEM
G MONITOR SWITCH
H MONITOR FUSE
I MAGNETRON TEMPERATURE FUSE
J CONV. THERMAL CUT-OUT
K CONVECTION HEATER
L THERMISTOR
M DAMPER MOTOR
N DAMPER SWITCH
Q TOUCH CONTROL PANEL
R KEY UNIT
S RELAY RY-1
S RELAY RY-2
S RELAY RY-3
S RELAY RY-4
S RELAY RY-5
S RELAY RY-6
T COMP. DEFROST
U FOIL PATERN ON PWB.
V AH SENSOR
Replace OVEN LAMP OR SOCKET
Replace FAN MOTOR
Replace TURNTABLE MOTOR
Replace CONVECTION MOTOR
Check LOOSE WIRING
Check SHORTED IN POWER CORD
Check NO POWER AT OUTLET
Check LOW VOLTAGE
P NOISE FILTER
PROBLEM
Home fuse blows when power cord is plugged into wall receptacle.
OFF CONDITION
Monitor fuse blows when power cord is plugged into wall receptacle
88:88 does not appear in display when power cord is first plugged into
Display does not operate properly when STOP/CLEAR pad is touched.
wall receptacle.
COOKING CONDITION
Oven lamp does not light with door opened.
Oven lamp does not light in cook cycle. (It light when door is opened).
Cooking cycle runs 1 minute then shuts down.
Oven lamp light, but turntable motor does not operate.
(The time of day should appear on the display with beep sound.)
Turntable motor operates normally but cooling fan motor does not
operate.
(MICROWAVE)
Oven does not go into a cook cycle, when START pad is touched.
Low or no power is produced during microwave cooking (The food is
Extremely uneven heating is produced in oven load (food).
Function of variable cooking does not operate properly except HIGH
heated incompletely or not heated at all)
Function of COMPU DEFROST does not operate properly.
power.
(CONVECTION)
CONV indicator lights, but oven does not go into cook cycle when
CONV indicator lights, but heating element does not heat.
Temperature in the oven cavity is lower or higher than preset.
START pad is touched.
(SENSOR
COOKING)
Cooling fan motor runs intermittently or all the time.
Convection cycle runs 4 minutes and 15 seconds then shuts down.
Oven in the sensor cooking condition but AH sensor does not end or AH
sensor turns off about max. 30 min. after start.
13
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