R-320FK R-320FQ R-320FW SERVICE MANUAL

R-320FK
R-320FQ
R-320FW
SERVICE MANUAL
S3205R320FPW/
MICROWAVE OVEN
MODELS
R-320FK
R-320FQ
R-320FW
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 SERVICING 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 ............................................................................................................................ 10
TEST PROCEDURE ............................................................................................................................................ 12
TOUCH CONTROL PANEL ................................................................................................................................. 21
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 27
PICTORIAL DIAGRAM ........................................................................................................................................ 33
POWER UNIT CIRCUIT ...................................................................................................................................... 34
CPU UNIT CIRCUIT ............................................................................................................................................ 35
PRINTED WIRING BOARD ................................................................................................................................. 36
PARTS LIST ........................................................................................................................................................ 37
PACKING AND ACCESSORIES ......................................................................................................................... 41
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
SHARP CORPORATION
43
R- 320 FK
R- 320 FQ
R-320FW
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal
and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches,
(5) evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation
and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual
before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be
performed on each oven prior to release to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave
Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS
CORPORATION immediately @1-800-237-4277.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven
and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's
Center for Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit
found with emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use
the unit until the oven has been brought into compliance.
R-320FK
R-320FQ
R-320FW
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.
(Example)
High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
Don't Touch !
Danger High Voltage
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 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.
Before Servicing
1. Disconnect the power supply cord
remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
, and then
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
After repairing
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.
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.
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.
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 reexamine 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.
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R- 320 FK
R- 320 FQ
R-320FW
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.
NOTE: After servicing, record data on service invoice and microwave leakage report.
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R-320FK
R-320FQ
R-320FW
SERVICE MANUAL
PRODUCT DESCRIPTION
MICROWAVE OVEN
R-320FK/ R-320FQ/ R-320FW
GENERAL INFORMATION
FOREWORD
This Manual has been prepared to provide Sharp Electronics Corp.
Service Personnel with Operation and Service Information for the
SHARP MICROWAVE OVEN,R-320FK, R-320FQ and R-320FW.
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.
OPERATION
TROUBLESHOOTING GUIDE AND
TEST PROCEDURE
TOUCH CONTROL PANEL
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
WIRING DIAGRAM
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.
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
PARTS LIST
R- 320 FK
R- 320 FQ
R-320FW
SPECIFICATION
ITEM
DESCRIPTION
Power Requirements
120 Volts / 14.2 Amperes
60 Hertz
Single phase, 3 wire grounded
Power Output
1200 watts (IEC TEST PROCEDURE)
Operating frequency of 2450MHz
Case Dimensions
Width 20-1/2"
Height 11-7/8"
Depth 17-1/8"
Cooking Cavity Dimensions
Width 14-3/4"
Height 8-3/4"
Depth 15-3/4"
1.2 Cubic Feet
Control Complement
Touch Control System
Clock ( 1:00 - 12:59 )
Timer (0 - 99 min. 99 seconds)
Microwave Power for Variable Cooking
Repetition Rate;
HIGH POWER ................................. 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
Number selection pads, TIMER/CLOCK pad
KEEP WARM PLUS pad, MINUTE PLUS pad
POWER LEVEL pad, STOP/CLEAR pad, START pad
HOT WATER pad, SENSOR REHEAT pad, CUSTOM HELP pad
SENSOR COOK pads, INSTANT ACTION pads, DEFROST CENTER pads
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.
Electrical Requirements
The electrical requirements are a 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
4
R-320FK
R-320FQ
R-320FW
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 the extension cord must be used, it
should be a 3-wire, 15 amp. or higher rated 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.
Grounded
Receptacle Box
3-Pronged Plug
Grounding Pin
3-Pronged Receptacle
OVEN DIAGRAM
1. Door open handle
Pull to open door.
2. Door latches
The oven will not operate unless the
door is securely close.
3. Removable turntable support
4. Removable turntable
The turntable will rotate clockwise or
counterclockwise.
5. Oven lamp
It will light when oven is operating or
door is opened.
6. Oven door with see-through window
7. Ventilation openings (Rear)
8. Auto-Touch control panel
9. Time display: Digital display, 99
minutes 99 seconds
10. Coupling
11. Wave guide cover
12. Power supply cord
7
6
9
5
2
10
11
8
12
1
4
3
TOUCH CONTROL PANEL
NOTE:
Some one-touch cooking features such as "MINUTE
PLUS"are disabled after three minutes 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.
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R- 320 FK
R- 320 FQ
R-320FW
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
the secondary interlock switch and primary interlock
relay and is mechanically associated with the door so
that it will function in the following sequence.
(1) When the door opens from the closed position, the
primary interlock relay (RY2) and secondary interlock
switch open their contacts. And contacts of the relay
(RY1) remains closed. Then the monitor switch contacts
close.
(2) When the door is closed from the open position, the
monitor switch contacts open first. Then the contacts of
the secondary interlock switch and door sensing switch
close. And contacts of the relay (RY1) open.
If the secondary interlock switch and primary interlock relay
(RY2) fail with the contacts closed when the door is opened,
the closing of the monitor switch contacts will form a short
circuit through the monitor fuse, secondary interlock switch,
relay (RY1) and primary interlock relay (RY2), causing the
monitor fuse to blow.
The following is a description of component functions during
oven operation.
OFF CONDITION
Closing the door activates the door sensing switch and
secondary interlock switch. (In this condition, the monitor
switch contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the
control unit. (Figure O-1).
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.
COOKING CONDITION
Program desired cooking time by touching the NUMBER
pads. Program the power level by touching the POWER
LEVEL pad.
When the START pad is touched, the following operations
occur:
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) which is operated by
the control unit within a 32 second time base. Microwave
power operation is as follows:
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)
VARI-MODE
RELAY
RY-1
RY-2
CONNECTED COMPONENTS
oven lamp/turntable motor/fan motor
power transformer
100% power
2. 120 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3.3 volts
A.C. output on the filament winding, and approximately
2355 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, the
monitor switch, door sensing switch, secondary interlock
switch, relay (RY1) and primary interlock relay 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 electrically monitors the operation of
DISPLAY
OFF TIME
32 sec.
0 sec.
approx. 90% power
P-90
30 sec.
2 sec.
approx. 80% power
P-80
26 sec.
6 sec.
approx. 70% power
P-70
24 sec.
8 sec.
approx. 60% power
P-60
22 sec.
10 sec.
approx. 50% power
P-50
18 sec.
14 sec.
approx. 40% power
P-40
16 sec.
16 sec.
approx. 30% power
P-30
12 sec.
20 sec.
approx. 20% power
P-20
8 sec.
24 sec.
approx. 10% power
P-10
6 sec.
26 sec.
P-0
0 sec.
32 sec.
0% power
Note:
HIGH POWER
ON TIME
The ON/OFF time ratio does not correspond with
the percentage of microwave power, because
approx. 3 seconds are needed for heating of the
magnetron filament.
SENSOR COOKING CONDITION
Using the SENSOR function, the food is 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 supplemen6
R-320FK
R-320FQ
R-320FW
tary cooking is determined by experiment with each food
category and inputted into the LSI.
An example of how sensor works: (POTATOES)
1. Potates at room temperature. Vapor is emitted very
MIC
slowly.
R
OW
AVE
2. Heat Potates. Moisture and humidity is emitted rapidly.
You can smell the aroma as it cooks.
AH SENSOR
MIC
RO
WA
VE
3. Sensor detects moisture and humidity and calculates
cooking time and variable power.
Cooking Sequence.
1. Operate the oven in sensor cooking mode by referring to
the operation manual.
NOTE: The oven should not be operated on SENSOR
immediately after plugging in the unit. Wait two
minutes before cooking on SENSOR.
2. The coil of shut-off relay (RY-1) is energized, the turntable
motor, oven lamp and cooling fan motor are turned on,
but the power transformer is not turned on.
3. 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.
4. 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, turn, or
season food.
5. 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.
6. Opening the door or touching the STOP/CLEAR pad, the
time of day will reappear on the display and the oven will
revert to an OFF condition.
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R- 320 FK
R- 320 FQ
R-320FW
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
MONITOR
FUSE 20A
THERMAL
CUT-OUT (OVEN)
NOTE: "
" indicates components with potential above 250V.
THERMAL
CUT-OUT (MG.)
N.O.
POWER
TRANSFORMER
N.O.
F3
A2
CAPACITOR 1µF
AC 2300V
F2
F1
PRIMARY
INTERLOCK
RELAY
AH SENSOR
(RY-2)
(RY-1)
A1
CONTROL UNIT
COM.
COM.
SH-B
GRN
120V AC
60 Hz
SH-A
DOOR
SENSING
SWITCH
OL
OVEN
LAMP
TTM
MONITOR
SWITCH
FM
RECTIFIER
MAGNETRON
SECONDARY
INTERLOCK
SWITCH
TURNTABLE
MOTOR
FAN
MOTOR
Figure O-1. Oven Schematic-Off Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. VARIABLE COOKING CONTROL "HIGH"
4. "START" PAD TOUCHED
MONITOR
FUSE 20A
THERMAL
CUT-OUT (OVEN)
THERMAL
CUT-OUT (MG.)
N.O.
POWER
TRANSFORMER
N.O.
F3
A2
CAPACITOR 1µF
AC 2300V
F2
F1
PRIMARY
INTERLOCK
RELAY
AH SENSOR
(RY-2)
(RY-1)
A1
CONTROL UNIT
COM.
COM.
SH-B
GRN
120V AC
60 Hz
SH-A
DOOR
SENSING
SWITCH
OL
OVEN
LAMP
TTM
MONITOR
SWITCH
FM
RECTIFIER
MAGNETRON
SECONDARY
INTERLOCK
SWITCH
TURNTABLE
MOTOR
FAN
MOTOR
Figure O-2. Oven Schematic-Cooking Condition
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R-320FK
R-320FQ
R-320FW
DESCRIPTION AND FUNCTION OF COMPONENTS
DOOR OPEN MECHANISM
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE TEST THE DOOR SENSING SWITCH,
PRIMARY INTERLOCK RELAY (RY2), RELAY
(RY1), 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.
The door is opened by pulling the door. Refer to the Figure
D-1.
Door
Latch Hook
Door Sensing
Switch
Latch
Heads
TURNTABLE MOTOR
The turntable motor rotates the turntable located on the
bottom of the oven cavity, so that the foods on the turntable
cook evenly during cooking. The turntable may turn in either
direction.
Monitor Switch
Secondary
Interlock Switch
COOLING FAN MOTOR
The cooling fan motor drives a blade which draws external
cool air. This cool air is directed through the air vents
surrounding the magnetron and cools the magnetron. This
air is channelled through the oven cavity to remove steam
and vapors given off from the heating foods. It is then
exhausted through the exhausting air vents at the oven
cavity.
Figure D-1. Door Open Mechanis
DOOR SENSING AND SECONDARY INTERLOCK
SWITCHES
The secondary interlock switch is mounted in the lower
position of the latch hook and the door sensing switch in the
primary interlock system is mounted in the upper position of
the latch hook. They are activated by the latch heads on the
door. When the door is opened, the switches interrupt the
power to all high voltage 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.
MONITOR FUSE
1. The monitor fuse blows when the contacts (COM-NO) of
the primary interlock relay (RY2) and secondary interlock
switch remain closed with the oven door open and when
the monitor switch closes.
2. If the wire harness or electrical components are shortcircuited, this monitor fuse blows to prevent an electric
shock or fire hazard.
MONITOR SWITCH
The monitor switch is activated (the contacts opened) by the
latch head on the door 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 (RY2) and secondary interlock switch fail to
open when the door is opened.
OVEN THERMAL CUT-OUT
The thermal cut-out, located on the top of the oven cavity, is
designed to prevent damage to the oven by fire. If the food
load is overcooked, by either error in cook time or defect in
the control unit, the thermal cut-out will open.
Under normal operation, the oven thermal cut-out remains
closed. However, when abnormally high temperatures are
reached within the oven cavity, the oven thermal cut-out will
open at 257˚F(125˚C), causing the oven to shut down.
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 primary interlock relay (RY2) and
secondary interlock switch 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
(RY2) and secondary interlock switch contacts fail to
open, the monitor fuse blows simultaneously with closing
of the monitor switch contacts.
MAGNETRON THERMAL CUT-OUT
The thermal cut-out located near the magnetron is designed
to prevent damage to the magnetron if an over heated
condition develops in the tube due to cooling fan failure,
obstructed air guide, dirty or blocked air intake, etc.
Under normal operation, the thermal cut-out remains closed.
However, when abnormally high temperatures are reached
within the magnetron, the thermal cut-out will open at
293˚F(145˚C) causing the oven to shut down.
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R- 320 FK
R- 320 FQ
R-320FW
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-BA023WRK0 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.
10
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CK = Check / RE = Replace
Home fuse or circuit breaker blows
when power cord is plugged into wall
receptacle
Monitor fuse blows when power cord
is plugged into wall receptacle.
OFF
CONDITION
All letters and indicators do not appear in display when power cord is
first plugged into wall outlet.
Display does not operate properly
when STOP/CLEAR key is touched.
(Buzzer should sound and ":" or time
of day should appear in display.)
Oven lamp does not light when door
is opened.
Oven lamp does not go out when
door is closed.
Oven lamp lights but fan motor and
turntable motor do not operate.
Oven does not go into cook cycle
when START pad is touched
Oven seems to be operating but little
or no heat is produced in oven load.
(Food incompletely cooked or not
cooked at all at end of cook cycle.)
COOKING
CONDITION
Oven goes into a cook cycle but
extremely uneven heating is produced in oven load (food).
Oven does not cook properly when
programmed for cooking power 50%
mode. (Operates properly on cooking power 100% mode.)
Oven goes into DEFROST CENTER
but food is not defrosted well.
SENSOR
COOKING
CONDITION
AH sensor does not end during Sensor cooking condition. (Oven does
not shut off after a cup of water is
boiling by sensor cooking.)
Oven stops at 16 sec. after starting.
11
AH SENSOR
FOIL PATTERN ON PWB.
DEFROST CENTER
KEY UNIT
RELAY (RY1)
DIRTY OVEN CAVITY
LOW VOLTAGE
WRONG OPERATION
TURNTABLE MOTOR
TOUCH CONTROL PANEL
COOLING FAN MOTOR
OVEN LAMP
MONITOR SWITCH
MONITOR FUSE
SECONDARY INTERLOCK SWITCH
PRIMARY INTERLOCK SYSTEM
THERMAL CUT-OUT
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE CAPACITOR
POWER TRANSFORMER
MAGNETRON
PROBLEM
SHORT IN POWER CORD
CONDITION
RE RE A B C D E F F G H RE RE CK I CK CK CK J K L M N
SHORT OR OPENED WIRING
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
TEST PROCEDURE
R- 320 FK
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TEST PROCEDURES
PROCEDURE
LETTER
A
COMPONENT TEST
MAGNETRON ASSEMBLY TEST
1.
2.
3.
4.
5.
6.
7.
8.
9.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
MICROWAVE OUTPUT POWER
The following test procedure should be carried out with the microwave oven in a fully assembled
condition (outer case fitted).
HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD
BE OBSERVED.
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 100% (HIGH) power 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 31.5
to 58.5˚F(17.5 to 32.5˚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
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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 89 ohms; the resistance of the filament coil should be less than 1 ohm.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
(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
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts.
D
HIGH VOLTAGE CAPACITOR TEST
1.
2.
3.
4.
5.
6.
7.
8.
E
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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 an open circuit 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.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
OVEN THERMAL CUT-OUT TEST
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the
temperature of the thermal cut-out reaches approximately 257˚F(125˚C).
An open thermal cut-out indicates overheating of the oven, exchange the oven thermal cut-out and
check inside of oven cavity and for improper setting of cooking time or operation of control unit. Check
for restricted air flow through the vent holes of the oven cavity, especially the cooling fan and air guide.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
MAGNETRON THERMAL CUT-OUT TEST
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. A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the
temperature of the magnetron reaches approximately 293˚F(145˚C). An open thermal cut-out
indicates overheating of the magnetron. Check for restricted air flow to the magnetron, especially the
cooling fan air guide.
13
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE,
REPLACE THERMAL CUT-OUT.
F
SECONDARY INTERLOCK SWITCH TEST
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicate 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.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
PRIMARY INTERLOCK SYSTEM TEST
DOOR SENSING SWITCH
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. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicate 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.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
NOTE: If the door sensing switch contacts fail in the open position and the door is closed, the cooling
fan, turntable and oven light will be activated by RY1.
PRIMARY INTERLOCK RELAY (RY2)
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 two (2) wire leads from the male tab terminals of the Primary Interlock Relay. Check the
state of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay contacts
are closed, replace the circuit board entirely or the relay itself.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
G
MONITOR SWITCH TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Before performing this test, make sure that the secondary interlock switch and the primary interlock
relay are operating properly, according to the above Switch Test Procedure. Disconnect the wire lead
from the monitor switch (COM) 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
14
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
5.
6.
7.
8.
actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity
with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should
indicate an open circuit. If improper operation is indicated, the switch may be defective. After testing
the monitor switch, reconnect the wire lead to the monitor switch (COM) terminal and check the
continuity of the monitor circuit.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all
WHT
functions.
RED
Screw Driver
Monitor Switch
Secondary
Interlock Switch
H
Ohmmeter
BLOWN MONITOR FUSE TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary
interlock 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 monitor switch must
be replaced with "monitor fuse and monitor switch assembly" part number FFS-BA023WRK0, even
if the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised
of a 20 ampere fuse and switch.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
I
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 also the Control Unit is divided into two units, CPU Unit and Power Unit, and troubleshooting
by unit replacement is described according to the symptoms indicated.
Before testing,
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 these leads remain isolated from other components and oven chassis by using
insulation tape.
1. Key Unit.
NOTE ;
1) Check Key unit ribbon connection before replacement.
15
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
2) Re-install the outer case (cabinet).
3) Reconnect the power supply cord after the outer case is installed.
4) Run the oven and check all functions.
The following symptoms indicate a defective 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.
If the Key unit is defective.
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) Replace the Key unit.
5) Reconnect all leads removed from components during testing.
6) Re-install the outer case (cabinet).
7) Reconnect the power supply cord after the outer case is installed.
8) Run the oven and check all functions.
2. Control Unit
The following symptoms indicate a defective control unit. Before replacing the control unit, perform
the Key unit test (Procedure J) to determine if control unit is faulty.
2-1 In connection with pads.
a) When touching the pads, a certain group of pads do not produce a signal.
b) When touching the pads, no pads produce a signal.
2-2 In connection with indicators
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light up; or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
2-3 Other possible problems 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.
When 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) Re-install the outer case (cabinet).
6) Reconnect the power supply cord after the outer case is installed.
7) Run the oven and check all functions.
J
KEY UNIT TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
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 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 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. If the control unit responds by
16
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
5.
6.
7.
8.
clearing with a beep the key unit is faulty and must be replaced. If the control unit does not respond,
it is faulty and must be replaced. If a specific pad does not respond, the above method may be used
(after clearing the control unit) to determine if the control unit or key pad is at fault.
Reconnect all leads removed from components during testing.
Re-install the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
G8
G7
G6
G5
G4
G3
G2
G1
G9
3
POPCORN
RICE
4
9
START MINUTE
PLUS
5
G10
8
KEEP WARM SENSOR CHICKEN STOP
STEAKS
HOT
PLUS
REHEAT BREAST CLEAR WATER CHOPS
0
G11
7
G12
2
G13
1
FROZEN
FISH
FROZEN
FRESH
BONE-IN
ROLLS/
VEGETABLES SEAFOOD MUFFINS VEGETABLES POULTRY
BAKED GROUND FROZEN CUSTOM FRESH GROUND MEAT BONELESS
ROLLS/
POTATOES MEAT ENTREES HELP MUFFINS ( DEFROST CENTER) POULTRY
BEVERAGE
TIMER
CLOCK
POWER
LEVEL
6
G14
K
RELAY TEST
1.
2.
3.
4.
5.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Disconnect the leads to the primary of the power transformer.
Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between Pin No. 1 of the 2 pin connector (A) and the normal
open terminal of the relay RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1 and RY2 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.
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
RY1
RY2
OPERATIONAL VOLTAGE
Approx. 24.0V D.C.
Approx. 24.0V D.C.
CONNECTED COMPONENTS
Oven lamp / Turntable motor / Cooling fan motor
Power transformer
8. Disconnect the power supply cord, and then remove outer case.
9. Open the door and block it open.
10. Discharge high voltage capacitor.
11. Reconnect all leads removed from components during testing.
12. Re-install the outer case (cabinet).
13. Reconnect the power supply cord after the outer case is installed.
14. Run the oven and check all functions.
17
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TEST PROCEDURES
PROCEDURE
LETTER
L
COMPONENT TEST
DEFROST CENTER TEST
WARNING : The oven should be fully assembled before following procedure.
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the " STEAKS / CHOPS " pad once.
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows
MENU
1ST STAGE
STEAKS/CHOPS LEVEL
TIME
0.5lb
70%
15sec.
2ND STAGE
LEVEL TIME
60%
25sec.
3RD STAGE
LEVEL TIME
30%
37sec.
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
M
FOIL PATTERN ON THE PRINTED WIRING BOARD TEST
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on
the PWB, this foil pattern acts as a fuse.
1. Foil pattern check and repairs.
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) Follow the troubleshooting guide given below for repair.
STEPS
OCCURRENCE
CAUSE OR CORRECTION
1
Only pattern at "a" is broken.
*Insert jumper wire J1 and solder.
2
Pattern at "a" and "b" are broken.
*Insert the coil RCILF2003YAZZ between "c" and "d".
RY1
RY3
5) Make a visual inspection of the varistor.
Check for burned damage and examine the
transformer with a tester for the presence of
layer short-circuit (check the primary coil
resistance which is approximately 212Ω ±
10%). If any abnormal condition is detected,
(J1)
replace the defective parts.
6) Reconnect all leads removed from
components during testing.
7) Re-install the outer case (cabinet).
8) Reconnect the power supply cord after the
outer case is installed.
9) Run the oven and check all functions.
2. Follow the troubleshooting guide given below, if indicator does not light up after above check and
repairs are finished.
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 these leads remain isolated from other components and oven chassis by using
insulation tape.
6) After that procedure, re-connect the power supply cord.
7) Follow the troubleshooting guide given below for repair.
c
d
b
a
OCCURRENCE
T1
VRS1
STEPS
CAUSE OR CORRECTION
1
The rated AC voltage is not present between
Pin No. 1 of the 2-pin connector (A) and the
normal open terminal of the relay RY1.
Check supply voltage and oven power cord.
2
The rated AC voltage is present at primary
side of low voltage transformer.
Low voltage transformer or secondary circuit defective.
Check and repair.
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
8)
9)
10)
11)
12)
13)
14)
N
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Reconnect all leads removed from components during testing.
Re-install the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
AH SENSOR TEST
Checking the initial sensor cooking condition
WARNING : The oven should be fully assembled before following procedure.
(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” of the operation manual.
(4) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To
permit adequate ventilation, be sure to install so as not to block these vents. There should be some
space for air circulation.
(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture
with a dry cloth or paper towel.
(6) The Sensor works with food at normal storage temperature. For example, chicken pieces would be
at refrigerator temperature and canned soup at room temperature.
(7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The
sensor will detect the vapor given of by the spray and turn off before food is properly cooked.
(8) If the sensor has not detected the vapor of the food, ERROR will appear and the oven will shut off.
Water load cooking test
WARNING : The oven should be fully assembled before following procedure.
Make sure the oven has been plugged in at least two 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 the TIMER/CLOCK once, the POWER LEVEL pad twice, the START pad once and the
number pads 1 once and the number pad 4 once. Now, the oven is in the sensor cooking condition,
and "AH20", "SENSOR" and "COOK" will appear in the display.
(5) The oven will operate for the first 16 seconds, without generating microwave energy.
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.
If ERROR is displayed or the oven does not turn off, replace the AH sensor or check the control unit, refer
to explanation below. If the oven stops after 5 minutes and ERROR is displayed, the AH sensor is normal.
Check other parts except the AH sensor.
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 the power supply cord, and then remove outer case.
(2) Open the door and block it open.
(3) Discharge high voltage capacitor.
(4) Remove the AH sensor.
(5) Install the new AH sensor.
(6) Reconnect all leads removed from components during testing.
(7) Re-install the outer case (cabinet).
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
(8) Reconnect the power supply cord after the outer case is installed.
(9) Reconnect the oven to the power supply and check the sensor cook operation as follows:
9-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
9-2. Place the container on the center of tray in the oven cavity.
9-3. Close the door.
9-4. Touch the TIMER/CLOCK pad once, the POWER LEVEL pad twice, the START pad once and
the number pads 1 once and the number pad 4.
9-5. The control panel is in automatic Sensor operation.
9-6. The oven turns off automatically, and the time for detecting moisture will be displayed.
If new sensor dose not operate properly, the problem is with the control unit, and refer to explanation
below.
CHECKING CONTROL UNIT
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Disconnect the sensor connector that is mounted to control panel.
Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
Disconnect the leads to the primary of the power transformer.
Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
(8) After that procedure, re-connect the power supply cord.
(9) Check the sensor cook operation proceed as follows:
9-1. Touch the TIMER/CLOCK pad once, the POWER LEVEL pad twice, the START pad once and
the number pads 1 once and the number pad 4.
9-2. The control panel is in the sensor cooking operation.
9-3. After approximately 25 seconds, push plunger of select switch for more than 3 seconds. This
condition is same as judgement by AH sensor.
9-4. After approximately 3 seconds, the display shows “ X X . X X “ which is the time for detecting
moisture.
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective.
(10) Disconnect the power supply cord, and then remove outer case.
(11) Open the door and block it open.
(12) Discharge high voltage capacitor.
(13) Disconnect the dummy resistor circuit from the sensor connector of control panel.
(14) Carry out necessary repair.
(15) Reconnect all leads removed from components during testing and repairing.
(16) Re-install the outer case (cabinet).
(17) Reconnect the power supply cord after the outer case is installed. Run the oven and check all
functions.
(18) Carry out "Water load cooking test" again and ensure that the oven works properly.
R1, R2 : 22Ω ± 1% 1/2W
R3 : 4.3kΩ ± 5% 1/4W
R4 : 1MΩ ± 5% 1/4W
F-1
F-2
Plunger
NC
NO
To connector (F)
on Control Unit.
1
2
3
COM
COM NO
R1
F-3
R2
CONNECTOR
R3
R4
Sensor Dummy Resistor Circuit
20
NC
R-320FK
R-320FQ
R-320FW
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
3) Power Source Circuit
This circuit generates voltages necessary in the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in order
to compose a basic standard time in the clock circuit.
The touch control section consists of the following units.
(1) Key Unit
(2) Control Unit (The Control Unit consists of Power Unit and
LSI Unit).
The principal functions of these units and the signals communicated among them are explained below.
Symbol
Voltage
VC
-5V
Application
LSI(IC1)
4) Relay Circuit
A circuit to drive the magnetron, fan motor, turntable
motor and light the oven lamp.
Key Unit
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through P110-P117.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through P100, P101,
P102, P103, ANI6 and ANI7 to perform the function that was
requested.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (key touch sound and completion sound).
Control Unit
Control unit consists of LSI, reset circuit, indicator circuit,
power source circuit, relay circuit, buzzer circuit, synchronizing signal circuit, absolute humidity sensor circuit and
back light circuit.
6) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit.
It accompanies a very small error because it works on
commercial frequency.
1) Reset Circuit
This circuit generates a signal which resets the LSI to the
initial state when power is supplied.
7) Door Sensing Switch
A switch to “tell” the LSI if the door is open or closed.
8) Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LD1- LD4).
2) Indicator Circuit
This circuit consists of 36 segments and 3 common
electrodes using a Liquid Crystal Display.
9) Absolute Humidity Sensor Circuit
This circuit detects moisture of the cooking food to allow
its automatic cooking.
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DESCRIPTION OF LSI
LSI
The I/O signal of the LSI is detailed in the following table.
Pin No.
Signal
I/O
Description
1-2
P26-P27
OUT
Terminal not used.
3-5
P70-P72
OUT
Terminal not used.
6
IC
IN
Connected to VC.
7
X2
OUT
8
X1
IN
Internal clock oscillation frequency control input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to X1.
9
VDD1
IN
Power source voltage: GND(0V).
The power source voltage to drive LSI is input to VDD1 terminal.
10
XT1
IN
Connected to GND.
11
XT2
OUT
Terminal not used.
12
RESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied.
13
INTP0
IN
Connected to VC.
14
INTP1
IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
Internal clock oscillation output.
Output to control oscillation input to X2.
H : GND
L : -5V
16.7 msec.
15
P02
OUT
Terminal not used.
16
P03
OUT
Magnetron high-voltage circuit driving signal.
OFF
To turn on and off the cook relay (RY2). The
Maximum
signals holds “L” level during microwave output
cooking and “H” level while not cooking. In
OFF
other cooking modes (variable cooking) the
signal turns to “H” level and “L” level in 70% of maximum
output
repetition according to the power level.
17
P04
OUT
H : GND
ON
L : -5V
OFF
24 sec.
ON
Oven lamp, fan motor and turntable motor driving signal
16.7 msec.
To turn on and off shut off relay (RY1). The
square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.
H : GND
8 sec.
L : -5V
H : GND
L : -5V
During cooking
18
P05
OUT
Terminal not used.
19
P110
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102
and P103 terminal while one of G8 line keys on key matrix is touched.
20
P111
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102
and P103 terminal while one of G7 line keys on key matrix is touched.
21
P112
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102
and P103 terminal while one of G6 line keys on key matrix is touched.
22
P113
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102
and P103 terminal while one of G5 line keys on key matrix is touched.
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R-320FQ
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Pin No.
Signal
I/O
Description
23
P114
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102
and P103 terminal while one of G4 line keys on key matrix is touched.
24
P115
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102
and P103 terminal while one of G3 line keys on key matrix is touched.
25
P116
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to ANI7, P100, P101, P102
and P103 terminal while one of G2 line keys on key matrix is touched.
26
P117
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to ANI6, ANI7, P100, P101,
P102 and P103 terminal while one of G1 line keys on key matrix is touched.
27
AVSS
IN
Connected to VC.
28
ANI0
OUT
Terminal not used.
29-31
ANI1-ANI3
IN
Terminal to change cooking input according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to set up its cooking constant.
32
ANI4
IN
Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is an
analog input terminal from the AH sensor circuit, and connected to the A/D converter built
into the LSI.
33
ANI5
IN
AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the
A/D converter built into the LSI.
34
ANI6
IN
Input terminal to judge the model.
The signal out of P117 will be input into ANI6 through G1 line on key matrix. The LSI will
judge the model by this signal.
35
ANI7
IN
Signal coming from touch key.
When either G13 line on key matrix is touched, a corresponding signal out of P110 - P117
will be input into ANI7. When no key is touched, the signal is held at “H” level.
36
VDD0
IN
Power source voltage : GND(0V).
The power source voltage to drive LSI is input to VDD0 terminal.
37
AVREF
IN
A/D converter power source voltage : GND(0V).
The power source voltage to drive the A/D converter. Connected to GND.
38
P100
IN
Signal similar to ANI7.
When either G12 line on key matrix is touched, a corresponding signal will be input into
P100.
39
P101
IN
Signal similar to ANI7.
When either G11 line on key matrix is touched, a corresponding signal will be input into
P101.
40
VSS1
IN
Power source voltage : -5.0V.
The power source voltage to the drive LSI is input to VSS1 terminal. Connected to VC.
41
P102
IN
Signal similar to ANI7.
When either G10 line on key matrix is touched, a corresponding signal will be input into
P102.
42
P103
IN
Signal similar to ANI7.
When either G9 line on key matrix is touched, a corresponding signal will be input into
P103.
43
P30
OUT
Terminal not used.
44-48
P31-P35
OUT
Used for initial balancing of the bridge circuit (absolute humidity sensor).
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Pin No.
Signal
I/O
49
P36
OUT
Description
0.1 sec.
H : GND
Signal to sound buzzer (2.0 kHz).
A: key touch sound.
B: Completion sound.
A
2.0 sec.
L : -5V
H : GND
B
L : -5V
50
P37
IN
To input signal which communicates the door open/close information to LSI.
Door close “H” level signal (0V). Door open “L” level signal (-5V).
51
COM0
OUT
Common data signal.
Connected to LCD signal COM2.
52
COM1
OUT
Common data signal.
Connected to LCD signal COM1.
53
COM2
OUT
Common data signal.
Connected to LCD signal COM0.
54
COM3
OUT
Terminal not used.
55
BIAS
IN
Power source voltage : GND(0V).
56
VLC0
IN
Power source voltage input terminal.
Standard voltage for LCD. Connected to GND.
57-58
VLC1-VLC2
IN
Power source voltage input terminal.
Standard voltage for LCD.
59
VSS0
IN
Power source voltage: -5.0V.
The power source voltage to the LSI is input to VSS0 terminal. Connected toVC.
60-95
S0-S35
OUT
Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
LCD (Pin No.)
S0 (60) ...................................... SEG 0
S1 (61) ...................................... SEG 1
S2 (62) ...................................... SEG 2
S3 (63) ...................................... SEG 3
S4 (64) ...................................... SEG 4
S5 (65) ...................................... SEG 5
S6 (66) ...................................... SEG 6
S7 (67) ...................................... SEG 7
S8 (68) ...................................... SEG 8
S9 (69) ...................................... SEG 9
S10 (70) ..................................... SEG 10
S11 (71) ..................................... SEG 11
S12 (72) ..................................... SEG 12
S13 (73) ..................................... SEG 13
S14 (74) ..................................... SEG 14
S15 (75) ..................................... SEG 15
S16 (76) ..................................... SEG 16
S17 (77) ..................................... SEG 17
96-99
100
P83-P80
OUT
Terminal not used.
P25
OUT
Terminal not used.
24
LSI signal (Pin No.)
LCD (Pin No.)
S18 (78) .................................... SEG 18
S19 (79) .................................... SEG 19
S20 (80) .................................... SEG 20
S21 (81) .................................... SEG 21
S22 (82) .................................... SEG 22
S23 (83) .................................... SEG 23
S24 (84) .................................... SEG 24
S25 (85) .................................... SEG 25
S26 (86) .................................... SEG 26
S27 (87) .................................... SEG 27
S28 (88) .................................... SEG 28
S29 (89) .................................... SEG 29
S30 (90) .................................... SEG 30
S31 (91) .................................... SEG 31
S32 (92) .................................... SEG 32
S33 (93) .................................... SEG 33
S34 (94) .................................... SEG 34
S35 (95) .................................... SEG 35
R-320FK
R-320FQ
R-320FW
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.
Thermistors
Sensing part
(Closed vessel)
(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.
R1
S
R3
R2
Output
voltage
S : Thermistor
open vessel
C : Thermistor
closed vessel
R98
620k
44
R99
300k
45
R100
150k
46
R101
75k
47
R102
37.4k
48
R97
S
R91
3.32k R92
1.8k
8 7 6 5
1 2 3 4
IC2
R93
360k
VA : -15V
Absolute humidity (g/m 2 )
(3) Detector Circuit of Absolute Humidity Sensor Circuit
This detector circuit is used to detect the output voltage
of the absolute humidity circuit to allow the LSI to control
sensor cooking of the unit. When the unit is set in the
sensor cooking mode, 16 seconds clearing cycle occurs
than the detector circuit starts to function and the LSI
observes the initial voltage available at its ANI5 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 R98 ~ R102. Changing
the resistance values results in that there is the same
potential at both F-3 terminal of the absolute humidity
sensor and ANI4 terminal of the LSI. The voltage of
ANI5 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
25
VA : -15V
SW1
P31
P32
P33
P34
P35
0.01uF
R95
47k
D90
VC : -5V
SW2
SW3
SW4
SW5
ANI4
LSI
(IC1)
C92
R94
10k
R90
F-2
C91
F-1
C
R96
F-3
3.57k
0.015uF
C93
32
0.01uF
47k
Absolute humidity vs,
output voltage characteristic
Operational
amplifier
+
C. Thermistor in
closed vessel
S. Thermistor in
open vessel
Output voltage
C
1) Absolute humidity sensor circuit
0.1
uF
Sensing part
(Open vessel)
C90
ventilation opening for sensing
which the resistance balance of the bridge circuit is
deviated to increase the voltage available at ANI5
terminal of the LSI.
Then the LSI observes that voltage at ANI5 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 ANI5
terminal 16 seconds after the unit has been put in the
Sensor Cooking mode, if it is not possible to balance the
bridge circuit due to disconnection of the absolute
humidity sensor, ERROR will appear on the display and
the cooking is stopped.
31
ANI5
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R-320FW
TOUCH CONTROL PANEL SERVICING
A. On some models, the power supply cord between the
touch control panel and the oven itself is so short that the
two can’t be separated. For those models, check and
repair all the controls (sensor-related ones included) of
the touch control panel while keeping it connected to the
oven.
B. On some models, the power supply cord between the
touch control panel and the oven proper is long enough
that they may be separated from each other. For those
models, 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 activates 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
activates 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
sensor-related controls of the touch control panel by
using the dummy resistor(s).
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the
circuits. When handling these parts, the following
precautions should be strictly followed. CMOS LSI have
extremely high impedance at its input and output
terminals. For this reason, it is easily influenced by the
surrounding high voltage power source, static electricity
charge in clothes, etc. and sometimes it is not fully
protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap them in
aluminium foil. Also wrap all PW boards containing them
in aluminium foil.
2) When soldering, ground the technician as shown in the
figure and use grounded soldering iron and work table.
approx. 1M ohm
2. 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 AND PRESENTS A HAZARD.
Therefore, before checking the performance of the touch
control panel,
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 these leads remain isolated from other
components and oven chassis by using insulation
tape.
6) After that procedure, re-connect the power supply
cord.
After checking the performance of the touch control panel,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) Re-connect the leads to the primary of the power
transformer.
4) Re-install the outer case (cabinet).
5) Re-connect the power supply cord after the outer
case is installed.
6) Run the oven and check all functions.
3. 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
4. Other Precautions
1) Before turning on the power source of the control unit,
remove the aluminium foil applied for preventing static
electricity.
2) Connect the connectors of the key unit to the control unit
being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that abnormal
voltage due to static electricity etc. is not applied to the
input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to PWB,
making sure that all connections are tight.
5) Be sure to use specified components where high precision
is required.
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R-320FW
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING AGAINST HIGH VOLTAGE:
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may
result in severe, possibly fatal, electric shock.
(Example)
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
WARNING:
Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
1. Disconnect the power supply cord.
2. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
WARNING FOR WIRING
To prevent an electric shock, take the following precautions.
1. Before wiring,
1) Disconnect the power supply cord.
2) Open the door block it open.
3) Discharge the high voltage capacitor and wait for 60
seconds.
2. Don’t let the wire leads touch to the following 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.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector until its pin is locked
and make sure that the wire leads do not come off even
if the wire leads are pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of
the following removal procedures:
OUTER CASE REMOVAL
To remove the outer case, proceed as follows.
1. Disconnect the power supply cord.
2. Open the oven door and block it open.
3. Remove the two (2) screws from the lower portion of the
rear cabinet using a T20H Torx type or GTXH20-100
screw driver.
4. Remove the remaining two (2) screws from rear and one
(1) screw along the right side of outer case.
5. Slide the entire outer case back out about 1 inch (3 cm)
to free it from retaining clips on the cavity face plate.
6. Lift entire outer case from the unit.
Special screw
Screw Driver
(Type: TORX T20 H or
GTXH20-100)
Figure C-1. Special screws position
27
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R-320FW
CAUTION: 1. DISCONNECT OVEN FROM POWER SUP
PLY BEFORE REMOVING OUTER CASE.
2. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN
COMPONENTS OR WIRING.
NOTE: When replacing the outer case, the 2 special
Torx screws must be reinstalled in the same
locations.
POWER TRANSFORMER REMOVAL
Reinstallation
1. Rest transformer on the bottom plate with its primary
terminals toward the oven face plate.
2. Secure transformer with four screws to bottom plate.
3. Re-connect wire leads (primary) to power transformer
and filament leads and high voltage wire of transformer
to magnetron and high voltage capacitor. Refer to
"PICTORIAL DIAGRAM" on page 33.
4. Re-install outer case and check that oven is operating
properly.
1. Disconnect the power supply cord and then remove
outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect wire leads (primary) from power transformer
and the filament leads and high voltage wire from the
magnetron and capacitor terminals.
5. Remove four (4) screws holding transformer to bottom
plate.
6. Remove transformer from bottom plate.
TERMINAL INSULATOR REPLACEMENT
Installation
1. Insert the receptacle into terminal insulator.
2. Close covers of the terminal insulator, as shown below.
3. Reconnect all leads removed from components during
testing.
4. Reinstall the outer case (cabinet).
5. Reconnect the power supply cord after the outer case is
installed.
6. Run the oven and check all functions.
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. Open covers of the terminal insulator by using small flat
type screw driver.
5. Remove the receptacle from the terminal insulator.
6. Now, the terminal insulator is free.
COVERS
Terminal
insulator
Flat type
screw driver
RECEPTACLE
HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL
oven cavity rear plate.
8. Remove one (1) screw holding high voltage rectifier
assembly to capacitor holder.
9. Disconnect rectifier terminal from capacitor.
High voltage rectifier assembly is now free.
10.Remove capacitor holder. Capacitor is now free.
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 high voltage wire of the power transformer
from the high voltage capacitor.
5. Disconnect the high voltage wire of high voltage rectifier
assembly from the magnetron.
6. Disconnect the filament lead (short one) of the power
transformer from the high voltage capacitor.
7. Remove two (2) screws holding capacitor holder to
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR,
GROUND SIDE TERMINAL OF THE HIGH
VOLTAGE RECTIFIER MUST BE SECURED
FIRMLY WITH A GROUNDING SCREW.
MAGNETRON REMOVAL
Removal
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 all wire leads from magnetron.
5. Remove the five (5) screws holding chassis support to
magnetron, oven cavity back plate, oven cavity front
flange and fan duct.
6. Remove the chassis support from oven.
7. Carefully remove the four (4) screws holding magnetron
to waveguide flange.
8. Lift up magnetron with care so that magnetron antenna
is not hit by any metal object around antenna.
28
R-320FK
R-320FQ
R-320FW
9. Now, the magnetron is free.
Reinstallation
1. Re-install the magnetron to waveguide flange with the
four (4) screws.
2. Insert the two (2) tabs of the chassis support to the oven
cavity front plate and the back plate.
3. Hold the chassis support to the oven cavity back plate,
oven cavity front flange, magnetron and the fan duct
with the five (5) screws.
4. Reconnect the wire leads to the magnetron and thermal
cut-out (MG). Refer to "PICTORIAL DIAGRAM" on page
33.
5. Re-install outer case and check that the oven is operating
properly.
CAUTION: WHEN REPLACING MAGNETRON, BE SURE
THE R.F. GASKET IS IN PLACE AND MOUNTING SCREWS ARE TIGHTENED SECURELY.
POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL
Terminal
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. Push the lever of positive lock® connector.
5. Pull down on the positive lock® connector.
Positive lock®
connector
1
Push
Lever
CAUTION: WHEN CONNECTING THE POSITIVE LOCK®
CONNECTORS TO THE TERMINALS, CONNECT THE POSITIVE LOCK® SO THAT THE
LEVER FACES YOU.
2
Pull down
Figure C-2. Positive lock® connector
CONTROL PANEL ASSEMBLY REMOVAL
3. Stick the key unit firmly to the control panel frame
by rubbing with soft cloth not to scratch.
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 wire leads from the door sensing switch and
the oven cavity front flange.
5. Disconnect the wire leads from panel components.
6. Remove the one (1) screw holding the control panel
assembly to the oven flange.
7. Slide the control panel assembly upward and remove it.
8. Now, individual components can be removed.
NOTE: 1. Before attaching a new key unit, wipe off remaining
adhesive on the control panel frame surfaces
completely with a soft cloth soaked in alcohol.
2. When attaching the key unit to the control panel
frame, adjust the upper edge and right edge of
the key unit to the correct position of control panel
frame.
CPU UNIT
NOTE: Handle the CPU unit carefully so that the ribbon
cable does not come off. Because the ribbon cable
is glued on the LCD and the printed wiring board
only by heated paste.
Liquid Crystal
Display (LCD)
Printed wiring board
of CPU unit
Ribbon cable
CPU unit
TURNTABLE MOTOR REMOVAL
1. Disconnect the power supply cord.
2. Remove turntable and turntable support from oven cavity.
3. Lay the oven on it's backside. Remove the turntable
motor cover by snipping off the material in four corners.
4. Where the corners have been snipped off bend corner
areas flat. No sharp edges must be evident after removal
of the turntable motor cover.
5. Disconnect wire leads from turntable motor.
(See "Positive lock connector removal")
6. Remove two (2) screws holding turntable motor to oven
cavity.
7. Now the turntable motor is free.
8. After replacement use the one (1) screw to fit the
turntable motor cover.
COOLING FAN MOTOR REMOVAL
REMOVAL
1. Disconnect the power supply cord and then remove
outer case.
2. Open the door and block it open.
29
R- 320 FK
R- 320 FQ
R-320FW
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from the fan motor and the
oven lamp.
5. Remove the magnetron and chassis support from the
waveguide flange, referring to "MAGNETRON
REMOVAL".
6. Release the snap of the main wire harness from the fan duct.
7. Remove one (1) screw holding the fan duct assembly to
oven cavity.
8. Release the main wire harness from the hole of the fan duct.
9. Release the fan duct from the waveguide flange.
10.Release the fan duct assembly from the oven cavity.
11.Remove the fan blade from the fan motor shaft according
to the following procedure.
12.Hold the edge of the rotor of the fan motor by using a pair
of groove joint pliers.
CAUTION:
* Make sure that no metal pieces 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.
13.Remove the fan blade from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.
14. Now, the fan blade will be free.
CAUTION:
* Do not reuse the removed fan blade because the
hole (for shaft) may be larger than normal.
15.Remove the two (2) screws holding the fan motor to the
fan duct.
16.Now, the fan motor is free.
INSTALLATION
1. Install the fan motor to the fan duct with the two (2)
screws.
2. Install the fan blade to the fan motor shaft according to
the following procedure.
3. Hold the center of the bracket which supports the shaft
of the fan motor on the flat table.
4. Apply the screw lock tight into the hole (for shaft) of the
fan blade.
5. 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.
6. Catch three holes of fan duct on three tabs of the
waveguide flange.
7. Install the fan duct assembly to the oven cavity with the
one (1) screw.
8. Insert the snap of the main wire harness to the hole of the
fan duct and insert the main wire harness into the hole of
the fan duct.
9. Install the magnetron and the chassis support to the
oven cavity, referring to "Re-install of MAGNETRON
REMOVAL".
10.Connect the wire leads to the fan motor and the oven
lamp, referring to the pictorial diagram.
Coil
Shaft
Groove joint pliers
Stator
Gap
Bracket
Table
Shaft
Rotor
These are the positions
that should be pinched
with pliers.
Axis
Stator
Center of
bracket
Rotor
Rear View
Side View
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL
Reinstallation
1. Re-install each switch in its place. The secondary
interlock/monitor switches are in the lower position and
the door sensing switch is in the upper position.
2. Re-connect wire leads to each switch.
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.
1.
2.
3.
4.
5.
6.
7.
Disconnect the power supply cord and remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Disconnect wire leads from the switches.
Remove two (2) screws holding latch hook to oven flange.
Remove latch hook assembly from oven flange.
Push outward on the two (2) retaining tabs holding switch
in place.
8. Switch is now free.
30
R-320FK
R-320FQ
R-320FW
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT
1. Disconnect the power supply cord, and then remove
outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
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.
4. Loosen the two (2) screws holding latch hook to the oven
cavity front flange.
5. 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 upper and lower position of the latch hook
should be less than 0.5mm. The vertical position of the
latch hook should be adjusted so that the door sensing
switch and secondary interlock switch are activated with
the door closed. The horizontal position of the latch hook
should be adjusted so that the plunger of the monitor
switch is pressed with the door closed.
6. Secure the screws with washers firmly.
7. Check the operation of all switches. If each switch has
not activated with the door closed, loosen screw and
adjust the latch hook position.
hook, pushing and pulling upper portion of door toward
the oven face. Then check lower portion of the latch
hook, pushing and pulling lower portion of the door
toward the oven face. Both results (play in the door)
should be less than 0.5mm.
2. The contacts of door sensing switch and secondary
interlock switch open within 1.5mm gap between right
side of cavity face plate and door when door is open.
3. Monitor switch contacts close when door is opened.
4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
Door
Latch Hook
Latch
Heads
Door Sensing
Switch
Monitor Switch
Secondary
Interlock Switch
After adjustment, check the following.
1. In and out play of door remains less than 0.5mm when in
the latched position. First check upper position of latch
Figure C-3. Latch Switch Adjustments
DOOR REPLACEMENT
door frame.
10.Release door panel from eight (8) tabs of door frame.
11.Now, door panel with sealer film is free.
12.Tear sealer film from door panel.
13.Now, door panel is free.
14.Slide latch head upward and remove it from door frame
with releasing latch spring from door frame and latch
head.
15.Now, latch head and latch spring are free.
16.Remove door screen from door frame.
17.Now, door screen is free.
REINSTALLATION
1. Re-install door screen to door frame .
2. Re-install the latch spring to the latch head. Re-install the
latch spring to the door frame. Re-install latch head to
door frame.
3. Re-install door panel to door frame by fitting eight (8)
tabs of door frame to eight (8) holes of door panel.
4. Hold the door panel to the door frame with the four (4)
screws.
5. Put sealer film on door panel. Refer to “Sealer Film”
about how to handle new one.
6. Catch two (2) pins of door panel on two (2) hole of upper
and lower oven hinges.
7. Re-install choke cover to door panel by pushing.
Note: After any service to the door;
(A) Make sure that door sensing switch and secondary
interlock switch are operating properly. (Refer to
REMOVAL
1. Disconnect the power supply cord.
2. Open the door slightly.
3. Insert a putty knife (thickness of about 0.5mm) into the
gap between the choke cover and door frame as shown
in Figure C-4 to free engaging parts.
4. Pry the choke cover by inserting a putty knife as shown
Figure C-4.
5. Release choke cover from door panel.
6. Now choke cover is free.
NOTE: When carrying out any repair to the door, do not
bend or warp the slit choke (tabs on the door
panelassembly) to prevent microwave leakage.
7. Release two (2) pins of door panel from two (2) holes of
upper and lower oven hinges by lifting up.
8. Now, door panel with door frame is free from oven cavity.
Door Frame
Putty Knife
Choke Cover
Figure C-4. Door Disassembly
9. Remove the four (4) screws holding the door panel to the
31
R- 320 FK
R- 320 FQ
R-320FW
chapter “Test Procedures”.).
(B) An approved microwave survey meter should be
used to assure compliance with proper microwave
radiation emission limitation standards.
After any service, 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. Check for microwave leakage around door with an
approved microwave survey meter. (Refer to Microwave
Measurement Procedure.)
Note: The door on a microwave oven is designed to act as
an electronic seal preventing the leakage of
microwave energy from 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.
SEALER FILM
Installation
1. Put the adhesive tape on the backing film of the sealer
film as shown in Fig. C-6.
2. Tear the backing film by pulling the adhesive tape.
3. Put the pasted side of the sealer film on the door panel
Sealer film
Adhesive tape
Figure C-6. Sealer film
Pin
Upper
Oven Hinge
Backing film
Upper Oven
Hinge
Slit choke
Lower
Oven Hinge
Lower Oven
Hinge
Pin
Choke Cover
Figure C-5. Door Replacement
32
1
2
3
33
BLK
1
4
(POWER UNIT)
2
N.O.
T1
RY2
PRIMARY
INTERLOCK
RELAY
YLW
BLK
RED
RED
CN-A
1 WHT
2
GRN
RED
N.C.
MONITOR
FUSE
&
HOLDER
5
COM.
TURNTABLE
MOTOR
WHT
BLK
RED
GRY
GRY
BLK
POWER
TRANSFORMER
MAGNETRON
HIGH VOLTAGE
CAPACITOR
HIGH VOLTAGE COMPONENTS
BLK
THERMAL
CUT-OUT (MG)
NOTE:
The neutral (WHT) wire must be
connected to the terminal with "N"
mark on the power supply cord.
POWER SUPPLY
CORD 120V 60Hz
5
Figure S-1. Pictorial Diagram
BLK
BLK
C
WHT
WHT
WHT
GRY
WHT
COM.
FAN MOTOR
WHT
GRY
BLK
BLK
WHT
N
4
SECONDARY NO
INTERLOCK
SWITCH
MONITOR
SWITCH
RED
(To oven cavity front flange.)
GRN
THERMAL
CUT-OUT (OVEN)
BLK
H
3
CN-A
N.O.
RY1
SP1
CN-F
CN-C SH-B SH-A
(CPU UNIT)
CN-C
RED
GRN
BLK
WHT
BLK
2
YLW
YLW
G
IC1
GRN
COM.
N.O.
YLW
WHT
D
CN-G
F
DOOR
SENSING
SWITCH
E
OVEN LAMP
A
CONTROL UNIT
AH SENSOR
1
H.V.
RECTIFIER
H
CN-F
1 BLK
2 RED
3 WHT
B
NOTE:
The grounding conductor of
the power supply cord has
been grounded by power
supply cord fixing screw.
The screw must allways be
kept tight.
R-320FK
R-320FQ
R-320FW
6
A
B
C
6
D
E
F
G
H
R- 320 FK
R- 320 FQ
R-320FW
2
1
4
3
6
5
A
A
B
B
C10
NC
C2
GND
C3
NC
C9
VR
C4
INT
C1
VA
C5
BUZZER
GND
3
D20
S1NB10
A1
CN-A
d 1
T1
(J1)
a
+
4
–
C2 1000µ/35v
A2
C
10G471K
AC
VRS1
C
6
b
D
D
OVEN LAMP
FAN MOTOR
TURNTABLE
MOTOR
SP1
c
RY1
COM
J2
E
AC
NO
C6
OVEN LAMP
FAN MOTOR
TURNTABLE
MOTOR
E
D1
(CN-D)
C8
NC
C7
MICRO
D3
RY2
F
MICRO
NO
COM
B2
SH-A
SH-B
C11
NC
C12
DOOR
SENSING
SWITCH
F
B1
CN-C
(CN-B)
G
G
12PIN LEAD WIRE
HARNESS
DOOR SENSING
SWITCH
H
H
Figure S-2. Power Unit Circuit
1
2
4
3
34
5
6
35
C-12
DOOR
SENSING
SWITCH
C1 0.1µ/50v
D10 MA152WA
4
NOTE
Q2 KTA1661
D30
MA152WA
–
+
Q3
KRC243S
R90
330 1w
C11 0.1µ/50v
C3 0.1µ/50v
F-1
F-2
C20
0.1µ
/50v
C12
0.1µ
/50v
D90
MA152WA
F-3
R92 1.8kF
CN-F AH SENSOR
(Q22 DTA123JKA)
Q21 DTA123JKA
Q20 DTA143EKA
Q30 DTA143EKA
R3 510
1/2w
C4 10µ/35v
: IF NOT SPECIFIED 1/10W ± 5%
(D20)
MA152WK
R4
27 1/4w
D5 D6
1SS355 x 2
R2 680
Q1 KTA1661
–
C10 47µ/16v
R5 4.7k
C13
0.01µ
/25v
D
8 7 6 5
IC2 BA4558
1 2 3 4
E
B
5
DEF HELP
100
SEG35
SEG21
CF1 CST4.00MGW
KEEP WARM SENSOR CHICKEN
REHEAT BREAST
PLUS
8
KEY UNIT
1
2
7
4
RICE
POPCORN
3
STOP
CLEAR
9
G4
50
30
E
D
C
B
A
G1
5
G2
MINUTE
PLUS
G3
START
31
P37
P36
P35
P34
P33
P32
P31
P30
P103
P102
VSS1
P101
P100
AVREF
VDD0
ANI7
ANI6
ANI5
ANI4
ANI3
51
R15 R14 R13
10K 10K 10K
HOT
STEAKS
0
WATER CHOPS
FROZEN
BONE-IN
FROZEN
FRESH
FISH
BEVERAGE VEGETABLES SEAFOOD ROLLS/ VEGETABLES POULTRY
MUFFINS
FRESH
GROUND MEAT BONELESS
BAKED GROUND FROZEN CUSTOM ROLLS/
POTATOES MEAT
ENTREES HELP
MUFFINS (DEFROST CENTER) POULTRY
TIMER
POWER
6
LEVEL
CLOCK
G5
G6
1
IC1
G7
G8
80
S21
S22
S23
S24
S25
S26
S27
S28
S29
S30
S31
S32
S33
S34
S35
P83
P82
P81
P80
P25
81
5
C60 330p/50v
C61 330p/50v
Figure S-3. CPU Unit Circuit
R73 15k
R72 15k
R71 15k
R70 15k
R41 15k
COOK SENSOR LBS
A
R69 15k
A
VC
GND
4
R68 15k
C
R97 47k
R94 10k R95 47k
Q10
2SA
1037AK
LIQUID CRYSTAL DISPLAY
3
C-11
C-8
C-7
TOP
HEATER
MICRO
C-6
C-5
BUZZER
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
C-1
C-10
C-3
C-9
VA
NC
NC
VR
–
R12 15k
C90
0.1µ
/50v
R1 2.4k
1/4w
R6
3.3k
1/4w
R96 3.57KD
R91 3.32KD
Q11
DTA143EKA
R101 75kF
+
R99 300k
ZD1
UDZ16B
LD1 LD2 LD3 LD4
C5
10µ
/35v
R93 360kF
R100 150kF
(J11)
R10 1k
ZD10
UDZ4.3B
R102 37.4kF
ANI6
ANI7
P100
P101
P102
P103
4.7K
C40 0.01µ/25v
R11 15k
R40 4.7k
C91
0.015µ/25v
R98 620k
R79 270k
(J12)
(J13)
C92
0.01µ
/25v
+
4.7K
C64 330p/50v
CPU UNIT
(J15)
C63 330p/50v
(J14)
4.7K
C62 330p/50v
C-2
G14 G13 G12 G11 G10 G 9
C14
0.01µ
/25v
(J10)
R78 270k
3
R77 270k
R76 270k
R75 270k
R74 270k
R80
1M
R67
15k
C-4
R66
15k
GND
R65
15k
H
R64
15k
2
C65 330p/50v
SEG35
SEG34
SEG33
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
COM0
COM1
COM2
1
S20
S19
S18
S17
S16
S15
S14
S13
S12
S11
S10
S9
S8
S7
S6
S5
S4
S3
S2
S 1 SEG0
S0
VSS0
VLC2
VLC1
VLC0
BIAS
COM3
COM2
COM1
COM0
G
R63
15k
F
P26
P27
P70
P71
P72
IC
X2
X1
VDD1
XT1
XT2
RESET
INTP0
INTP1
P02
P03
P04
P05
P110
P111
P112
P113
P114
P115
P116
P117
AVSS
ANI0
ANI1
ANI2
E
2
R62
15k
D
C93 0.01µ/25v
C
R61
15k
1
R60
15k
B
INT
R-320FK
R-320FQ
R-320FW
6
A
B
C
6
D
E
F
G
H
R- 320 FK
R- 320 FQ
R-320FW
2
1
4
3
6
5
A
A
DIP
12
1
R3
C3
R5
R2
B R1
ZD1
1
2
(CN - B)
D5
R4
D6
E
E
B Q2
C4
R6
B
C1
D1
D
RY1
RY3
(CN - D)
D8
RY2
D7
D
E
(D20)
C2
(D10)
D9
E
Q3
C5
(R9)
C
D4
D3
B
(J2)
D2
C
SP1
2
1
SW
B
(RED) (GREEN)
SH - B SH - A
CN - C
E
P
S
(J1)
F
F
VRS1
T1
2
1
CN - A
1
G
F
G
H
H
Figure S-4. Printed Wiring Board of Power Unit
1
2
4
3
36
5
6
R-320FK
R-320FQ
R-320FW
PARTS LIST
Note: The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V.
REF. NO.
PART NO.
DESCRIPTION
Q'TY
CODE
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AG
AH
AH
AS
AK
AQ
AQ
AP
AU
AW
AU
BH
BF
AV
-BQ
AK
AW
AS
AS
AQ
AH
AP
BC
1
1
1
1
1
BD
BD
AX
AC
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
BA
AC
AE
AD
AF
AF
AG
AK
AM
AG
AP
AE
BH
BA
BB
BA
AW
AX
AW
AE
AD
AA
1
1
1
1
1
1
1
1
1
1
AE
AF
AH
AD
AL
AZ
-AU
AB
AF
ELECTRIC PARTS
*
*
*
*
∆*
∆*
*
1- 1
1- 1
1- 2
1- 3
1- 4
1- 5
1- 5
1- 6
1- 6
1- 7
1- 7
1- 8
1- 8
1- 9
1- 9
1-10
1-11
1-12
1-12
1-12
1-12
1-13
1-13
1-14
QSW-MA147WRZZ
QSW-MA137WRE0
QFSHDA009WRE0
FFS-BA023WRK0
RTHM-A127WRZZ
FACCDA083WRE0
FACCDA085WREZ
FH-DZA088WRK0
FH-DZA094WRKZ
RC-QZA288WRZZ
RC-QZA235WRE0
RV-MZA291WRE0
RV-MZA295WRE0
RMOTEA383WRE0
RMOTEA408WRZZ
RTRN-A662WRZZ
RLMPTA082WRZZ
RMOTDA186WRE0
RMOTDA161WRE0
RMOTDA211WRE0
RMOTDA229WRE0
RTHM-A120WRE0
RTHM-A080WRE0
FDTCTA197WRK0
2nd interlock switch/door sensing switch
2nd interlock switch/door sensing switch (Interchangeable)
Fuse holder
Monitor fuse 20A and monitor switch (AM51620C53Y1) assembly
Thermal cut-out 125 deg.C (0VEN)
Power supply cord
Power supply cord (Interchangeable)
High voltage rectifier assembly
High voltage rectifier assembly (Interchangeable)
High voltage capacitor
High voltage capacitor (Interchangeable)
Magnetron
Magnetron (Interchangeable)
Fan motor
Fan motor (Interchangeable) for production use
Power transformer
Oven lamp
Turntable motor
Turntable motor (Interchangeable)
Turntable motor (Interchangeable)
Turntable motor (Interchangeable)
Thermal cut-out 145 deg.C (MG.)
Thermal cut-out 145 deg.C (MG.) (Interchangeable)
AH sensor assembly
22222-
GCABUA836WRPZ
GCABUA838WRPZ
GCABUA834WRPZ
GDAI-A343WRWZ
GLEGPA074WRE0
Outer case cabinet [R-320FK]
Outer case cabinet [R-320FQ]
Outer case cabinet [R-320FW]
Bottom plate
Foot
3- 1
3- 1A
3- 1B
3- 1C
3- 1D
C2
D20
RY1
RY2
SP1
T1
VRS1
3- 2
3- 3
3- 3
3- 3
3- 3-1
3- 3-1
3- 3-1
3- 4
3- 5
3- 6
DPWBFC024WRKZ
QCNCMA446DRE0
FW-VZA232DRE0
FW-VZA195DRE0
FW-VZA256DREZ
VCEAB31VW108M
RSRCDA013DRE0
RRLY-A076DRE0
RRLY-A113DRE0
RALM-A014DRE0
RTRNPA111DRE0
RH-VZA032DRE0
DPWBFC246WRKZ
FPNLCB615WRKZ
FPNLCB616WRKZ
FPNLCB617WRKZ
FUNTKB107WREZ
FUNTKB108WREZ
FUNTKB109WREZ
PSHEPA588WRE0
LHLD-A219WRFZ
XEPSD30P08XS0
Power unit
2-pin connector (CN-A)
12pin lead wire (CN-C)
Switch harness A (SH-A)
Switch harness B (SH-B)
Capacitor
1000 uF
35V
Diode bridge (S1NB10)
Relay (OMIF-S-124LM)
Relay (DU24D1-1PR(M))
Buzzer (PKM22EPT)
Transformer
Varistor (10G471K)
CPU unit
Control panel frame with key unit [R-320FW]
Control panel frame with key unit [R-320FK]
Control panel frame with key unit [R-320FQ]
Key unit [R-320FW]
Key unit [R-320FK]
Key unit [R-320FQ]
LED sheet
LCD holder
Screw; 3mm x 8mm
4- 1
4- 2
4- 3
4- 4
4- 5
4- 6
4- 7
4- 8
4- 9
4-10
PCUSUA235WRP0
PPACGA084WRF0
PHOK-A116WRFZ
LBNDKA099WRW0
NFANJA029WRE0
PDUC-A790WRWZ
*************
LANGFA194WRW0
PCUSGA560WREZ
LANG-A079WRWZ
Cushion
TTM packing
Latch hook
Capacitor holder
Fan blade
Fan duct
Oven cavity (Not a replaceable part)
Chassis support
Cushion
Air guide
CABINET PARTS
1
1
1
2
3
CONTROL PANEL PARTS
OVEN PARTS
∆
∆
37
R- 320 FK
R- 320 FQ
R-320FW
REF. NO.
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
PART NO.
LANG-A078WRWZ
NCPL-A053WRFZ
PCUSUA511WRP0
PCOVPA349WRE0
PCUSGA339WRP0
PCUSGA399WRE0
PCUSUA512WRP0
PCUSGA321WRP0
PCUSUA186WRP0
PCUSUA157WRP0
PCUSUA212WRP0
PCUSUA474WRP0
PCUSUA376WRP0
LANG-A065WRWZ
LANGTA368WRWZ
PCUSUA576WRPZ
DESCRIPTION
Barrier
Coupling
Cushion
Waveguide cover
Cushion
Cushion
Cushion
Cushion
Cushion
Cushion
Cushion
Cushion
Cushion
Sensor guide
Sensor mounting angle
Cushion
5- 1
5- 2
5- 3
5- 3
5- 3
5- 4
5- 4
5- 4
5- 5
5- 6
5- 7
5- 8
5- 9
5-10
5-11
FDORFA332WRT0
PSHEPA382WRE0
GWAKPA789WRRZ
GWAKPA783WRRZ
GWAKPA832WRRZ
HPNL-A740WRRZ
HPNL-A742WRRZ
HPNL-A742WRRZ
LSTPPA193WRFZ
MSPRTA187WRE0
XEPSD40P08000
PCUSUA461WRP0
PCUSUA553WRPZ
PCUSUA554WRPZ
GCOVHA417WRFZ
Door panel
Sealer film
Door frame [R-320FK]
Door frame [R-320FQ]
Door frame [R-320FW]
Door screen [R-320FK]
Door screen [R-320FQ]
Door screen [R-320FW]
Latch head
Latch spring
Screw : 4mm x 8mm
Cushion
Cushion
Cushion
Choke cover
6666666-
1
2
3
4
5
6
7
FROLPA079WRK0
NTNT-A079WRF0
FW-VZB902WREZ
TINSEA928WRRZ
PZET-A012WRE0
TCAUAA265WRRZ
TCAUAA254WRR0
Turntable support
Turntable tray
Main wire harness
Instruction book
Terminal insulator
DHHS caution label
Monitor caution label
7- 1
7- 2
7- 3
7- 4
7- 5
7- 6
7- 7
7- 7
7- 7
7- 8
7- 9
7-10
XHPSD40P08K00
XHPSD30P06000
XHTSD40P08RV0
XHTSD40P12RV0
XOTSD40P12RV0
XOTSD40P08000
XOTSF40P08000
XOTSE40P08000
XOTSE40P08000
LX-CZA070WRE0
LX-CZ0052WRE0
XHPSD40P08000
Screw :
Screw :
Screw :
Screw :
Screw :
Screw :
Screw :
Screw :
Screw :
Special
Special
Screw :
Q'TY
1
1
1
1
1
1
1
1
1
1
2
2
2
1
1
1
CODE
AF
AE
AC
AE
AG
AF
AB
AH
AC
AC
AB
AC
AF
AH
AK
AE
1
1
1
1
1
1
1
1
1
1
6
1
2
2
1
BD
AH
AZ
AZ
AX
AS
AS
AS
AE
AC
AA
AB
AC
AB
AG
1
1
1
1
1
1
1
AQ
AR
AV
AE
AB
AC
AC
6
3
5
1
1
20
1
1
1
2
2
4
AA
AA
AA
AA
AA
AA
AA
AA
AA
AC
AA
AA
DOOR PARTS
∆
∆
∆
∆
∆
MISCELLANEOUS
SCREWS,NUTS AND WASHERS
4mm x
3mm x
4mm x
4mm x
4mm x
4mm x
4mm x
4mm x
4mm x
screw
screw
4mm x
8mm
6mm
8mm
12mm
12mm
8mm
8mm [R-320FK]
8mm [R-320FQ]
8mm [R-320FW]
(Torx tamper proof screw)
8mm
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER
2. REF. NO.
3. PART NO.
4. DESCRIPTION
Order Parts from the authorized SHARP parts Distributor for your area.
Defective parts requiring return should be returned as indicated in the Service Policy.
38
R-320FK
R-320FQ
R-320FW
2
1
4
3
7-6
2-1
OVEN AND CABINET PARTS
6
5
7-8
A
A
7-6
4-23
4-25
4-22
1-14
7-2
7-10
B
4-17
7-8
4-9
1-4
B
4-20
1-8
7-6
7-7
6-7
7-6
4-24
6-6
4-13
4-7
4-23
C
C
4-11
7-6
7-3
4-10
4-21
7-3
D
D
1-5
7-6
7-4
4-19
4-22
7-1
4-12
1-7
4-21
1-6
4-15
E
7-9
7-6
7-2
1-1
E
1-13
4-14
6-2
4-26
4-4
4-2
4-18
1-12
1-2
4-8
7-6
1-3
4-5
F
7-1
6-1
1-10
4-3
7-6
7-3
1-1
F
7-5
7-1
4-1
2-2
4-16
4-6
1-11
1-9
G
7-1
G
7-6
H
H
7-6
7-6
7-6
2-3
1
2
4
3
39
5
6
R- 320 FK
R- 320 FQ
R-320FW
2
1
4
3
6
5
CONTROL PANEL PARTS
3-2
A
A
3-6
3-5
3-3
3-4
B
B
3-1
3-6
DOOR PARTS
C
C
5-11
3-3-1
5-7
5-2
D
5-7
D
5-1
5-10
5-9
5-7
E
E
5-7
5-3
5-7
5-10
5-9
F
F
5-5
5-4
5-6
5-8
G
G
MISCELLANEOUS
6-3
6-5
H
H
Actual wire harness may be different from illustration.
1
2
4
3
40
5
6
R-320FK
R-320FQ
R-320FW
2
1
4
3
6
5
A
A
TOP PAD ASSEMBLY
PACKING AND ACCESSORIES
FPADBA458WRKZ
PLASTIC SHEET (for R-320FK)
SPADPA616WREZ
B
DOOR PROTECTION SHEET
B
CABINET COVER (for R-320FK/320FQ)
SPADPA204WRE0
SPAKHA011WRE0
PLASTIC BAG
SSAKHA034WRE0
FOAM SHEET
SPAKHA012WREZ
(for R-320FK/320FQ)
C
C
6-4
INSTRUCTION BOOK
& PRINTING MATTER
6-2
BOTTOM PAD ASSEMBLY
TURNTABLE TRAY
FPADBA469WRKZ
6-1 TURNTABLE SUPPORT
D
D
TRAY PACK
INTO THE
OVEN CAVITY
SPADFA451WRE0
E
Not replaceable items.
E
PACKING CASE
FPAK-A418WRKZ [R-320FK]
FPAK-A419WRKZ [R-320FQ]
FPAK-A417WRKZ [R-320FW]
F
F
G
G
H
H
1
2
4
3
41
5
6
R- 320 FK
R- 320 FQ
R-320FW
COPYRIGHT © 2002 BY SHARP CORPORATION
ALL RIGHTS RESERVED.
No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.
2002 SHARP CORP. (2S2.530E) Printed in U.S.A
42