R - 340DK
R -340DW
SERVICE MANUAL
S2008R340DPW/
MICROWAVE OVEN
MODELS
R-340DK
R-340DW
12 : 30 PM
1
2
4
5
7
8
9
0
Kitchen
Timer
Minute
PLus +
3
6
TOUCH . SCREEN
MINUTE
PLUS
STOP
CLEAR
START
ONE TOUCH SENSOR
Reheat
Popcorn
Baked
Potatoes
6x6 NO GUESS
COOKING
6 Categories + 36
Foods
Vegetables
Fish/
Seafood
Meat
Frozen
Seafood
More Frozen Your
6x6
Beverage
Senter
Defrost
Poultry
Pasta
Grains
Microwave
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.
Set Up
SMA RT & EAS Y
TOUCH
S
CREEN
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 ............................................................................................................................................ 11
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
SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R -340DK
R-340DW
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/cm 2. The owner of the unit should be instructed not to use the unit
until the oven has been brought into compliance.
R -340DK
R-340DW
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 ¬, and then remove
outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
WARNING: RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
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.
1
R- 340DK
R-340DW
MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven
should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition
by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external
surface of the oven.
2) Safety interlock switches Primary interlock relay and door sensing switch shall prevent microwave radiation emission in
excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission
in excess of 5 mW/cm2 at any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for
microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5˚C (68˚F) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)
and made of an electrically nonconductive material such as glass or plastic.
The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage
is measured accurately.
4) Set the cooking control on Full Power Cooking Mode.
5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement)
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal
has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed
latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the secondary interlock switch does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.
2
R -340DK
R-340DW
SERVICE MANUAL
PRODUCT DESCRIPTION
MICROWAVE OVEN
R-340DK/ R-340DW
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-340DK, R-340DW.
It is recommended that service personnel carefully study the entire
text of this manual so that they will be qualified to render satisfactory
customer service.
Check the interlock switches and the door seal carefully. Special
attention should be given to avoid electrical shock and microwave
radiation hazard.
OPERATION
TROUBLESHOOTING GUIDE AND
TEST PROCEDURE
TOUCH CONTROL PANEL
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.
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- 340DK
R-340DW
SPECIFICATION
ITEM
DESCRIPTION
Power Requirements
120 Volts / 14 Amperes
60 Hertz
Single phase, 3 wire grounded
Power Output
1150 watts (IEC TEST PROCEDURE)
Operating frequency of 2450MHz
Width 20-1/2"
Height 11-7/8"
Depth 17-1/8"
Width 14-3/4"
Height 8-3/4"
Depth 15-3/4"
Case Dimensions
Cooking Cavity Dimensions
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;
POWER 100% ................................. Full power throughout the cooking time
POWER 90% .................................................... approx. 90% of Full Power
POWER 80% .................................................... approx. 80% of Full Power
POWER 70% .................................................... approx. 70% of Full Power
POWER 60% .................................................... approx. 60% of Full Power
POWER 50% .................................................... approx. 50% of Full Power
POWER 40% .................................................... approx. 40% of Full Power
POWER 30% .................................................... approx. 30% of Full Power
POWER 20% .................................................... approx. 20% of Full Power
POWER 10% .................................................... approx. 10% of Full Power
POWER 0% .................................. No power throughout the cooking time
TOUCH SCREEN, MINUTE PLUS pad, STOP/CLEAR pad
START pad, ONE TOUCH SENSOR pads
6 X 6 NO GUESS COOKING pads
More From Your Microwave pad
Beverage Center pad, Defrost pad, Set Up pad
Oven Cavity Light
Safety Standard
Yes
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 -340DK
R-340DW
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.
Grounded
Receptacle Box
3-Pronged
Plug
Grounding Pin
CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS
PLUG.
1. Door open handle.
Pull to open door.
2. Door latches.
The oven will not operate unless the
door is securely closed.
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. Touch screen.
10. Coupling.
11. Wave guide cover.
12. Power supply cord
3-Pronged Receptacle
OVEN DIAGRAM
7
6
9
5
2
10
11
8
12
1
4
3
TOUCH CONTROL PANEL
12 : 30 PM
1
2
3
4
5
6
7
8
9
Minute
Plus +
0
Kitchen
Timer
TOUCH . SCREEN
MINUTE
PLUS
See note
STOP
CLEAR
START
ONE TOUCH SENSOR
Reheat
Popcorn
Baked
Potatoes
6x6 NO GUESS COOKING
6 Categories + 36 Foods
NOTE:
The directed features 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.
Vegetables
Meat
Poultry
Fish/
Seafood
Frozen
Food
Pasta
Grains
More From Your Microwave
6x6
Beverage
Center
5
Defrost
3+6
Set Up
R- 340DK
R-340DW
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions during
oven operation.
box, and then into the cavity where the food is placed to
be cooked.
5. Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off, and the
generation of microwave energy is stopped. The oven
will revert to the OFF condition.
6. When the door is opened during a cook cycle, 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
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.
OFF CONDITION
Closing the door activates the door sensing switch and
secondary interlock switch. (In this condition, the monitor
switch contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the
control unit (Figure O-1).
1. "Set clock" key and "Video demo" key will be appeared
on the touch screen.
2. Touch "Set clock" key and set the clock referring to the
operation manual.
NOTE: If any keys are not touched for 30 seconds, the
touch screen will go on to the Video Demo mode. To
cancel the Video Demo mode, touch the STOP/
CLEAR pad. And then set the clock.
3. The touch screen will show the home page after setting
the clock.
4. The following is the example of the Home page in the
case the time of the day is set to 12:30 p.m..
12 : 30 PM
1
2
3
4
5
6
7
8
9
0
Kitchen
Timer
Minute
Plus +
NOTE: Even if the clock is not set, the display will show the
Home page by touching the STOP/CLEAR pad
within 30 seconds after plugged in.
COOKING CONDITION
POWER LEVEL 0% TO 90% COOKING
Program desired cooking time by touching the NUMBER
keys on the touch screen. Program the power level by
touching the POWER LEVEL key and then touch the
desired percentage key on the touch screen.
When the START pad is touched, the following operations
occur:
1. The contacts of relays are closed and components
connected to the relays are turned on as follows.
(For details, refer to Figure O-2)
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:
VARI-MODE
POWER 100%
RELAY
CONNECTED COMPONENTS
RY-1
oven lamp/turntable motor/fan motor
RY-2
power transformer
2. 120 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3.1 volts
A.C. output on the filament winding, and approximately
2370 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 feed6
ON TIME
OFF TIME
(100% power)
32 sec.
0 sec.
POWER 90% (approx. 90% power)
30 sec.
2 sec.
POWER 80% (approx. 80% power)
26 sec.
6 sec.
POWER 70% (approx. 70% power)
24 sec.
8 sec.
POWER 60% (approx. 60% power)
22 sec.
10 sec.
POWER 50% (approx. 50% power)
18 sec.
14 sec.
POWER 40% (approx. 40% power)
16 sec.
16 sec.
POWER 30% (approx. 30% power)
12 sec.
20 sec.
POWER 20% (approx. 20% power)
8 sec.
24 sec.
POWER 10% (approx. 10% power)
6 sec.
26 sec.
POWER 0%
0 sec.
32 sec.
(approx. 0% power)
R -340DK
R-340DW
Note:
The ON/OFF time ratio does not correspond with
the percentage of microwave power, because
approx. 2 seconds are needed for heating of the
magnetron filament.
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.
SENSOR COOKING CONDITION
Using the Sensor cooking function (See sensor cooking
menus), 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 supplementary cooking
is determined by experiment with each food category and
inputted into the LSI.
An example of how sensor works: (BAKED POTATOES)
The followings are the sensor cooking menus.
Reheat
Popcorn
Baked potatoes
Vegetables
Ground beef of Meat
Boneless Chicken Breast, Bone-in Chicken Pieces and
Ground Poultry of Poultry
Fish / Seafood
Vegetables, Entrees, Main Dishes and Snacks of Frozen
food
White Rice and Brown Rice of Pasta Grains
Frozen breakfast food, Meal in cup, Hot dogs in buns,
Soup, Frozen sandwich, Stuffed Acorn Squash,
Ratatouille of More from Your Microwave
1. Potatoes at room temperature. Vapor is emitted very
MIC
slowly.
R
OW
AVE
2. Heated Potatoes. 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. Touch one of the One Touch Sensor pads (in case of one
touch sensor).
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.
7
R- 340DK
R-340DW
SCHEMATIC
NOTE: CONDITION OF OVEN.
1. DOOR CLOSED.
2. CLOCK APPEARS ON DISPLAY.
MONITOR
FUSE 20A
NOTE:
THERMAL
CUT-OUT (OVEN)
Indicates components with potential above 250 V.
THERMAL
CUT-OUT (MG.)
N.O.
POWER
TRANSFORMER
N.O.
F3
A2
CAPACITOR 0.94µF
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 POWER (100%) PROGRAMMED.
4. "START" PAD TOUCHED.
MONITOR
FUSE 20A
THERMAL
CUT-OUT (OVEN)
THERMAL
CUT-OUT (MG.)
N.O.
POWER
TRANSFORMER
N.O.
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
CAPACITOR 0.94µF
AC 2300V
F3
A2
MONITOR
SWITCH
FM
RECTIFIER
MAGNETRON
SECONDARY
INTERLOCK
SWITCH
TURNTABLE
MOTOR
FAN
MOTOR
Figure O-2. Oven Schematic-Cooking Condition
8
R -340DK
R-340DW
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
Latch
Heads
Door Sensing
Switch
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
Figure D-1. Door Open Mechanism
COOLING FAN MOTOR
DOOR SENSING AND SECONDARY INTERLOCK
SWITCHES
The cooling fan motor drives a blade which draws external
cool air. This cool air is directed through the air vanes
surrounding the magnetron and cools the magnetron. This
air is channelled through the oven cavity to remove steam
and vapors given off from the heating foods. It is then
exhausted through the exhausting air vents at the oven
cavity.
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.
9
R- 340DK
R-340DW
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 FFSBA021WRK0 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.
Touch screen does not operate properly when STOP/CLEAR key is
touched. (Buzzer should sound and
Home page 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 COMPU DEFROST
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.
COMPU DEFROST
RELAY (RY1)
KEY UNIT
DIRTY OVEN CAVITY
LOW VOLTAGE
WRONG OPERATION
TOUCH CONTROL PANEL
TURNTABLE MOTOR
COOLING FAN MOTOR
OVEN LAMP OR SOCKET
MONITOR FUSE
MONITOR SWITCH
SECONDARY INTERLOCK SWITCH
PRIMARY INTERLOCK SYSTEM
THERMAL CUT-OUT
HIGH VOLTAGE CAPACITOR
H.V. RECTIFIER ASSEMBLY
POWER TRANSFORMER
MAGNETRON
PROBLEM
SHORT OR OPENED WIRING
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 IN POWER CORD
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
TEST PROCEDURE
R- 340DK
R-340DW
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 POWER 100% 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 34.3
to 63.6˚F(19.1 to 35.4˚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.
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 74.2 ohms; the resistance of the filament coil should be less than 1 ohm.
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.
12
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
8. Run the oven and check all functions.
(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
13
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
indicates overheating of the magnetron. Check for restricted air flow to the magnetron, especially the
cooling fan air guide.
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
14
R -340DK
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
5.
6.
7.
8.
as follows. When the door is open, the meter should indicate a closed circuit. When the monitor switch
actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity
with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should
indicate an open circuit. If improper operation is indicated, the switch may be defective. After testing
the monitor switch, 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-BA021WRK0, 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.
2) Reconnect all leads removed from components during testing.
15
R- 340DK
R-340DW
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
3) Re-install the outer case (cabinet).
4) Reconnect the power supply cord after the outer case is installed.
5) 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.
h) The following symptoms indicate a defective CPU unit.
• When touching the keys on the touch screen, a certain key produces no signal at all.
• When touching a number key on the touch screen, two figures or more are displayed.
• When touching the keys on the touch screen, sometimes a key produces no signal.
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 (stop switch) operates properly; that is the
contacts are closed when the door is closed and open when the door is open. If the door sensing
switch (stop switch) is good, disconnect the flat ribbon cable that connects the key unit to the control
16
R -340DK
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
5.
6.
7.
8.
unit and make sure the door sensing switch is closed (either close the door or short the door sensing
switch connector). Use the Key unit matrix indicated on the control panel schematic and place a
jumper wire between the pins that correspond to the
G1
G2
G3
G14
STOP/CLEAR pad making momentary contact. If the
More
from
Defrost
control unit responds by clearing with a beep the key
Set Up
Your
G5
3+6
Microwave
unit is faulty and must be replaced. If the control unit
does not respond, it is faulty and must be replaced. If
Pasta Beverage STOP
G6
Center CLEAR
Grains
a specific pad does not respond, the above method
may be used (after clearing the control unit) to determine
Frozen
Vegetables
START
G13
if the control unit or key pad is at fault.
Food
Reconnect all leads removed from components during
MINUTE
Baked
testing.
Reheat Popcorn
G12
PLUS
Potatoes
Re-install the outer case (cabinet).
Fish /
Reconnect the power supply cord after the outer case
Poultry
Meat
G11
Seafood
is installed.
Run the oven and check all functions.
G15
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
common 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.
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
RELAY SYMBOL
Approx. 24.8V D.C.
Oven lamp / Turntable motor / Cooling fan motor
RY2
Approx. 23.9V D.C.
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 function.
L
COMPU DEFROST 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 Defrost pad and select compu Defrost. Then select Steaks/Chops/Fish.
(Now, weight 0.5lb is set.) And then touch the start pad.
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows
17
R- 340DK
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
WEIGHT
0.5lb
1ST STAGE
LEVEL
TIME
70%
40sec.
2ND STAGE
LEVEL
TIME
40%
30sec.
(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".
6)
7)
8)
9)
RY1
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 133Ω ± 10%). If any
abnormal condition is detected, replace
the defective parts.
a
c
b
(J1)
VRS1
d
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.
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.
STEPS
8)
9)
10)
11)
OCCURRENCE
CAUSE OR CORRECTION
1
The rated AC voltage is not present between
Pin No. 1 of the 2-pin connector (A) and the
common terminal of the relay RY1.
2
The rated AC voltage is present at primary
side of low voltage transformer.
Check supply voltage and oven power cord.
Low voltage transformer or secondary circuit defective.
Check and repair.
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.
18
R -340DK
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
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.
N
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 Reheat pad. Now, the oven is in the sensor cooking condition and "REHEAT" will appear in
the display for approx. 7 sec. and then "SENSING" will appear.
(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, and the display should start to count
down the remaining cooking time and oven should turn off after water is boiling (bubbling).
If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below.
TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT
To determine if the sensor is defective, the simplest method is to replace it with a new replacement
sensor.
(1) Disconnect 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).
(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 Reheat pad.
9-5. The control panel is in automatic Sensor operation.
19
R- 340DK
R-340DW
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
9-6. The display will start to count down the remaining cooking time, and the oven will turn off
automatically after the water is boiling (bubbling).
If new sensor does 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. below) 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 Reheat pad.
9-2. The control panel is in the sensor cooking operation.
9-3. After approximately 50 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 remaining cooking
time, and the display counts down.
If the above is not the case, the control unit is probably defective.
If the above is indicated, 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 : 82Ω ± 1% 1/2W
R3 : 10kΩ ± 5% 1/4W
R4 : 1MΩ ± 5% 1/4W
F-1
F-2
To connector (F)
on Control Unit.
1
2
3
Plunger
NC
NO
COM
COM NO
R1
F-3
R2
CONNECTOR
R3
R4
Sensor Dummy Resistor Circuit
20
NC
R -340DK
R-340DW
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
7) Indicator Circuit
This circuit consists of 100 x 160 dots using a Liquid
Crystal Display. The Liquid Crystal Display (LCD) is
drived by IC5.
The touch control section consists of the following units.
(1) Key Unit
(2) Control Unit (The Control Unit consists of Power Unit
and CPU Unit).
8) 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 principal functions of these units and the signals communicated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through P93, P94, P95 and
P40. When a key pad is touched, a signal is completed
through the key unit and passed back to the LSI through
PB1, PB2, PB3, PB4, PB5 and AN1 to perform the function
that was requested.
Symbol
Voltage
VC
+5V
Application
LSI(IC1)
9) Relay Circuit
A circuit to drive the magnetron, fan motor, turntable
motor and light the oven lamp.
Control Unit
Control unit consists of LSI, IC, ACL circuit, indicator circuit,
power source circuit, relay circuit, buzzer circuit, synchronizing signal circuit, key unit circuit, touch screen circuit,
absolute humidity sensor circuit and back light circuit.
10) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (key touch sound and completion sound).
11) 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) IC1 (LSI)
This is a microcomputer, responsible for controlling the
entire control unit.
2) IC2
This is a read only memory IC, responsible for giving IC1
the all programs.
12) Door Sensing Switch
A switch to “tell” the LSI if the door is open or closed.
3) IC3
This is an amplifier IC. This IC controls the contrast of
LCD and amplify the sensor signal.
13) Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LED1 and LED2).
4) IC4
This is a memory IC. This memorizes the contrast of
LCD.
14) Absolute Humidity Sensor Circuit
This circuit detects moisture of the cooking food to allow
its automatic cooking.
5) IC5
This IC drives the LCD.
15) Touch Screen
The touch screen is composed of a matrix, signal
generated in the LSI are sent to the key unit through
P41, P42, P43 and P44. When a key is touched, a signal
is completed through the touch screen and passed back
to the LSI through PB1, PB2, PB3, PB4 and PB5 to
perform the function that was requested.
6) ACL
This circuit generates a signal which resets the LSI (IC1)
to the initial state when power is supplied.
21
R- 340DK
R-340DW
LSI(IXA029DR)
The I/O signal of the LSI(IXA029DR) is detailed in the following table.
Pin No.
Signal
I/O
Description
1
TIOCA2
OUT
Terminal not used.
2
A20
OUT
Terminal not used.
3
Vcc
IN
4
TMO0
OUT
5
PB1
IN
Signal coming from touch key.
When either G11 line on key matrix is touched, a corresponding signal out of P93, P94,
P95, P40, P41, P42, P43 and P44 will be input into PB1. When no key is touched, the
signal is held at "H" level.
6
PB2
IN
Signal similar to PB1.
When either G12 line on key matrix is touched, a corresponding signal will be input into PB2.
7
PB3
IN
Signal similar to PB1.
When either G13 line on key matrix is touched, a corresponding signal will be input into PB3.
8
PB4
IN
Signal similar to PB1.
When either G6 line on key matrix is touched, a corresponding signal will be input into PB4.
9
PB5
IN
Signal similar to PB1.
When either G5 line on key matrix is touched, a corresponding signal will be input into PB5.
10-11
PB6-PB7
OUT
Terminal not used.
12
RESO
OUT
Terminal not used.
13
Vss
IN
14
TxD0
OUT
Data signal is output to a memory IC (IC4).
15
P91
OUT
Clock signal is output to a memory IC (IC4).
16
RxD0
OUT
Terminal not used.
17
P93
OUT
Key strobe signal.
Signal applied to key unit section. A pulse signal is input to PB1-PB5 terminal while one
of G1 line keys on key matrix is touched.
18
P94
OUT
Key strobe signal.
Signal applied to key unit section. A pulse signal is input to PB1-PB5 terminal while one
of G2 line keys on key matrix is touched.
19
P95
OUT
Key strobe signal.
Signal applied to key unit section. A pulse signal is input to PB1-PB5 terminal while one
of G3 line keys on key matrix is touched.
20
P40
OUT
Key strobe signal.
Signal applied to key unit section. A pulse signal is input to PB1-PB5 and AN1 terminal
while one of G14 line keys on key matrix is touched.
21
P41
OUT
Key strobe signal.
Signal applied to touch screen section. A pulse signal is input to PB1-PB5 terminal while
one of G7 line keys on key matrix is touched.
22
P42
OUT
Key strobe signal.
Signal applied to touch screen section. A pulse signal is input to PB1-PB5 terminal while
one of G8 line keys on key matrix is touched.
23
P43
OUT
Key strobe signal.
Signal applied to touch screen section. A pulse signal is input to PB1-PB5 terminal while
one of G9 line keys on key matrix is touched.
24
Vss
IN
Power source voltage : +5.0V.
The power source voltage to drive LSI is input to Vcc terminal. Connected to Vcc.
Signal to sound buzzer.
A: key touch sound (short beep). B: Completion sound (melody or long beep).
Power source voltage: GND(0V).
The power source voltage to drive LSI is input to Vss terminal.
Power source voltage : GND(0V).
The power source voltage to drive LSI is input to VSS terminal.
22
R -340DK
R-340DW
Pin No.
Signal
I/O
Description
25
P44
OUT
Key strobe signal.
Signal applied to touch screen section. A pulse signal is input to PB1-PB5 terminal while
one of G10 line keys on key matrix is touched.
26
P45
OUT
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 : +5V
L : GND
During cooking
27
P46
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds "H" level during microwave
cooking and "L" level while not cooking. In
other cooking modes (variable cooking) the
signal turns to "L" level and "H" level in
repetition according to the power level.
ON
100
PERCENT
OFF
L : GND
ON
70
PERCENT
H : +5V
H : +5V
24 sec.
8 sec. OFF
L : GND
(ON and OFF times for other power level.)
28
P47
OUT
Terminal not used.
29-36
D8-D15
OUT
Data signal is output to IC2 and IC5.
37
Vcc
IN
38-45
A0-A7
OUT
46
Vss
IN
47-58
A8-A19
OUT
59
Vss
IN
Power source voltage : GND (0V).
The power source voltage to drive LSI is input to Vss terminal.
60
WATT
IN
Connected to VCC.
61
P61
OUT
Envelope signal to sound buzzer.
A: key touch sound (short beep). B: Completion sound (melody or long beep).
62
P62
OUT
Reset signal is output to IC5.
63
P67
OUT
Terminal not used.
64
STBY
IN
Connected to VCC.
65
RES
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set
"L" level the moment power is applied, at this time the LSI is reset. Thereafter set at "H"
level.
66
NMI
IN
Connected to GND.
67
Vss
IN
Power source voltage : GND (0V).
The power source voltage to drive LSI is input to Vss terminal.
68
EXTAL
OUT
69
XTAL
IN
70
Vcc
IN
71
AS
OUT
Terminal not used.
72
RD
OUT
Read strobe signal is output to RD terminal of IC5.
73
HWR
OUT
Write strobe signal is output to WR terminal of IC5.
Power source voltage : +5V.
The power source voltage to drive LSI is input to Vcc terminal. Connected to VCC.
Address signal is output to IC2 and IC5.
Power source voltage : GND (0V).
The power source voltage to drive LSI is input to Vss terminal.
Address signal is output to IC2 and IC5.
Internal clock oscillation output.
Output to control oscillation input to EXTAL.
Internal clock oscillation frequency control input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XTAL.
Power source voltage : +5V.
The power source voltage to drive LSI is input to Vcc terminal. Connected to VCC.
23
R- 340DK
R-340DW
Pin No.
Signal
I/O
Description
74
LWR
OUT
Terminal not used.
75-76
MD0-MD1
IN
Connected to VCC.
77
MD2
IN
Connected to GND.
78
Avcc
IN
A/D converter power source voltage : +5V.
The power source voltage to drive the A/D converter. Connected to VCC.
79
Vref
IN
80
AN0
IN
A/D converter power source voltage : +5V.
The power source voltage to drive the A/D converter. Connected to VCC.
Terminal to judge whether the model has the sensor cooking function or not.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model
in operation is applied to judge whether the model has the sensor cooking function or not.
81
AN1
IN
Input terminal to judge the model.
The signal out of P40 will be input into AN1 through G15 line on key matrix. The LSI will
judge the model by this signal.
82
AN2
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.
83
AN3
IN
Connected to VCC.
84
AN4
IN
To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (+5V). Door open "L" level signal (GND).
85
AN5
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.
86
AN6
IN
AH sensor input.
This input is an analog input terminal from the AH sensor circuit, and connected to the
A/D converter built into the LSI.
87
DA1
OUT
88
Avss
IN
A/D converter power source voltage : GND(0V).
The power source voltage to drive the A/D converter. Connected to GND.
89
IRQ0
IN
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
The signal for the power source to drive the LCD is output to IC3.
H : +5V
L : GND
16.7 msec.
90-91
P81-P82
OUT
Terminal not used.
92
CS1
OUT
Chip select signal is output to CS terminal of IC5.
93
CS0
OUT
Chip select signal is output to CE terminal of IC2.
94
Vss
IN
95-99
PA0-PA4
OUT
Used for initial balancing of the bridge circuit (absolute humidity sensor).
100
PA5
OUT
Clock signal is output to IC5.
Power source voltage : GND (0V).
The power source voltage to drive the LSI is input to Vss terminal.
24
R -340DK
R-340DW
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.
resistance balance of the bridge circuit is deviated to
increase the voltage available at AN6 terminal of the LSI.
Then the LSI observes that voltage at AN6 terminal and
compares it with its initial value, and when the comparison
rate reaches the preset value (fixed for each menu to be
cooked), the LSI causes the unit to stop sensor cooking;
thereafter, the unit goes in the next operation
automatically.
When the LSI starts to detect the initial voltage at AN6
terminal 16 seconds after the unit has been put in the
Sensor Cooking mode, if it is not possible to balance the
bridge circuit due to disconnection of the absolute humidity
sensor, ERROR will appear on the display and the
cooking is stopped.
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 varied every minute, it is amplified by the
operational amplifier.
1) Absolute humidity sensor circuit
VA : +15V
R40 330
K
C. Thermistor in
closed vessel
S. Thermistor in
open vessel
3
C40 0.1µF
.57
23
R4
F1
R47 47K
R48 620K
R49 300K
R50 150K
R1
C
R2
Operational
amplifier
Output
voltage
+
S : Thermistor
open vessel
C : Thermistor
closed vessel
Absolute humidity vs,
output voltage characteristic
R52 37.4K
Output voltage
S
2
8
+
IC3
4
86
1
R45 10K
AN6
R46 47K
LSI
(IC1)
C41 0.015µF
C42 0.01µF
R43 1.8K
R51 75K
R3
86
13
K
R4
S
F3
VC : +5V
D40
.32
F2
C
ventilation opening for sensing
Sensing part
(Open vessel)
Absolute humidity (g/m 2 )
(3) Detector Circuit of Absolute Humidity Sensor Circuit
This detector circuit is used to detect the output voltage
of the absolute humidity circuit to allow the LSI to control
sensor cooking of the unit. When the unit is set in the
sensor cooking mode, 16 seconds clearing cycle occurs
than the detector circuit starts to function and the LSI
observes the initial voltage available at its AN6 terminal.
With this voltage given, the switches SW1 to SW5 in the
LSI are turned on in such a way as to change the
resistance values in parallel with R47 ~ R52. Changing
the resistance values results in that there is the same
potential at both F-3 terminal of the absolute humidity
sensor and AN5 terminal of the LSI. The voltage of AN6
terminal will indicate about +2.5V. This initial balancing
is set up about 16 seconds after the unit is put in the
Sensor Cooking mode. As the sensor cooking proceeds,
the food is heated to generate moisture by which the
25
R44 360K
C43 0.01µF
85
95
96
97
98
99
AN5
SW1
PA0
SW2
PA1
SW3
PA2
SW4
PA3
SW5
PA4
R- 340DK
R-340DW
TOUCH CONTROL PANEL SERVICING
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.
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. Shapes of Electronic Components
E
C
B
Transistor
2SD1859
3. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the
precautions you must take when doing so. To perform
the servicing, power to the touch control panel is available
either from the power line of the oven itself or from an
external power source.
(1) Servicing the touch control panel with power supply
of the oven:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING 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. 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: DC10MHz type or more advanced model.
3) Others: Hand tools
5. Other Precautions
1) Before turning on the power source of the control
unit, remove the aluminium foil applied for preventing
static electricity.
2) Connect the 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.
26
R -340DK
R-340DW
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)
27
R- 340DK
R-340DW
NOTE: When replacing the outer case, the 2 special
Torx screws must be reinstalled in the same
locations.
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.
POWER TRANSFORMER REMOVAL
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 and high voltage) from
power transformer and the filament leads from the
magnetron and capacitor terminals.
5. Remove four (4) screws holding transformer to bottom
plate.
6. Remove transformer from bottom plate.
Re-installation
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 and high voltage) to
power transformer and filament leads 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.
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
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 B from the power
transformer.
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 one (1) screw holding capacitor holder to 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.Disconnect the high voltage wire B from the high voltage
capacitor.
11.Remove capacitor holder. Capacitor is now free.
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. Disconnect the wire leads from thermal cut-out (MG).
6. Remove the four (4) screws holding chassis support to
magnetron, oven cavity back plate, oven cavity front
flange and fan duct.
7. Remove the chassis support from oven.
8. Carefully remove the four (4) screws holding magnetron
28
R -340DK
R-340DW
to waveguide flange.
9. Lift up magnetron with care so that magnetron antenna
is not hit by any metal object around antenna.
10.Remove the two (2) screws holding the magnetron duct
to magnetron.
11.Remove the magnetron duct with thermal cut-out (MG)
from magnetron.
12.Now, the magnetron is free.
Re-install
1. Re-install the magnetron duct with thermal cut-out (MG)
to magnetron with the two (2) screws.
2. Re-install the magnetron to waveguide flange with the
four (4) screws.
3. Insert the two (2) tabs of the chassis support to the oven
cavity front plate and the back plate.
4. Hold the chassis support to the oven cavity back plate,
oven cavity front flang, magnetron and the fan duct with
the four (4) screws.
5. Reconnect the wire leads to the magnetron and thermal
cut-out (MG). Refer to "PICTORIAL DIAGRAM" on page
33.
6. 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
OVEN LAMP AND LAMP SOCKET REMOVAL
1.
2.
3.
4.
5.
Disconnect the power supply cord and remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Remove the oven lamp from the oven lamp socket.
Pull the wire leads from the oven lamp socket by pushing
the terminal hole of the oven lamp socket with the small
flat type screw driver.
6. Bend the tab of the partition angle holding the lamp
socket.
7. Lift up the oven lamp socket.
8. Now, the oven lamp socket is free.
Oven lamp
socket
Terminal
Wire lead
Terminal hole
Flat type small
screw driver
Figure C-1. Oven lamp socket
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
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.
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. Make one (1) tab of the oven cavity front plate straight
holding the control panel assembly to the oven flange.
7. Slide the control panel assembly upward and remove it.
29
R- 340DK
R-340DW
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
15.Remove the two (2) screws holding the fan motor to the
fan duct.
16.Now, the fan motor is free.
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 the wire leads from the fan motor.
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 damaged.
* Do not disfigure the bracket by pinching 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.
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, 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
Rotor
Rear View
Side View
30
Center of
bracket
R -340DK
R-340DW
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL
Re-install
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.
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT
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 0.9mm 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.)
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.
Door
Latch Hook
Door Sensing
Switch
Latch
Heads
Monitor 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
Secondary
Interlock Switch
Figure C-3. Latch Switch Adjustments
DOOR REPLACEMENT
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.
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
door frame.
10.Release door panel from eight (8) tabs of door frame.
31
R- 340DK
R-340DW
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.
Pin
Upper
Oven Hinge
RE-INSTALL
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
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.
Upper Oven
Hinge
Lower
Oven Hinge
Lower Oven
Hinge
Pin
Choke Cover
Figure C-5. Door Replacement
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
Backing film
Adhesive tape
Figure C-6. Sealer film
32
1
2
H
3
33
4
BLK
(POWER UNIT)
1
2
CN-A
RY2
PRIMARY
INTERLOCK
RELAY
RED
RED
5
COM.
BLK
MONITOR
FUSE
&
HOLDER
BLK
TURNTABLE
MOTOR
WHT
BLK
WHT
GRY
BLK
BLK
RED
GRY
GRY
BLK
NOTE:
The neutral (WHT) wire must be
connected to the neutral (WHT)
wire of the power supply cord.
POWER SUPPLY
CORD 120V 60Hz
POWER
TRANSFORMER
HIGH VOLTAGE
WIRE B
MAGNETRON
HIGH VOLTAGE
CAPACITOR
HIGH VOLTAGE COMPONENTS
BLK
THERMAL
CUT-OUT (MG)
WHT
N
5
Figure S-1. Pictorial Diagram
WHT
WHT
WHT
GRY
WHT
COM.
SECONDARY NO
INTERLOCK
SWITCH
MONITOR
SWITCH
N.C.
RED
FAN MOTOR
THERMAL
CUT-OUT (OVEN)
BLK
H
4
(LOWER)
T1
(UPPER)
YLW
BLK
CN-A
1 WHT
2
RED
GRN
(To oven cavity front flange.)
E
(LOWER)
RY1
3
CN-F
1
GRN
RED
GRN
BLK
WHT
BLK
3
(UPPER)
CN-C
CN-C SH-A SH-B
11
IC1
GRN
COM.
N.O.
NOTE:
Hot (YLW) wire must be
connected to the terminal
with blue mark on the
oven light socket.
2
YLW
YLW
1
G
15
F
DOOR
SENSING
SWITCH
OVEN LAMP
AND SOCKET
D
CONTROL UNIT
AH SENSOR
YLW
WHT
C
(CPU UNIT)
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.
A
CN-G
1
H.V.
RECTIFIER
BLUE MARK
R -340DK
R-340DW
6
A
6
B
C
D
E
F
G
H
R- 340DK
R-340DW
2
1
4
3
6
5
A
A
B
R2 91 1w
A2
VR
C6
VA
C4
GND
C11
BZ/EN
C10
BUZZR
C9
OVEN LAMP
FAN MOTOR
TURNTABLE
MOTOR
B
b
AC120V
60Hz
–
R1
ZD1
HZ-16-1
a
2.4k
1/4w
+
D1
S1NB10
C2 1000µ/35v
VRS1
10G471K
Q1 2SD1859
D1
d
C
GND
(J1)
C
R3 91 1w
INT
C5
T1
A1
CN-A
C1
AC
C3
c
SP30
D
D
OVEN LAMP
FAN MOTOR
TURNTABLE
MOTOR
RY1
NO
COM
AC
RY2
E
E
NO
MICRO
COM
C7
MICRO
C8
N.C
C2
N.C
C1
DOOR
SENSING
SWITCH
F
F
(GREEN)
SH-A
SH-B
G
DOOR
SENSING
SWITCH
CN-C
11P LEAD WIRE HARNESS
NOTE
G
: IF NOT SPECIFIED, 0.1µF / 50V
H
H
Figure S-2. Power Unit Circuit
1
2
4
3
34
5
6
4
F3
F2
F1
C3
5
DOOR
SENSING
SWITCH
NC
NC
MICROR
C1
C2
C8
C7
C9
C10
CN-C
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
BUZZER
BUZZER ENV. C11
AH SENSOR
INT
C4
C10 10µ/35v
C44 0.1µ/50v
D21
MA152WK
+
–
C45 0.1µ/50v
C30 10µ/35v
R30 3.3k
C17 0.1µ/50v
R40 330 1w
R41 3.32kD
D20
MA152WK
Q22
KRC101S
Q20
KRA102S
Q32
KRC101S
Q31
KRC101S
Q30 KRA101S
–
+
3
IC3
1
4
R46 47k
R52 37.4kF
R51 75kF
R50 150kF
R49 300k
R48 620k
R47 47k
C41
0.015µ
/25v
8
2
C40 0.1µ/50v
ZD10
UDZ5.6B
R20 15k
C20
0.01µ
/25v
C42 0.01µ/25v
–
+
8
1
AN1
AN2
AN3
AN4
AN5
AN6
DA1
Avss
IR00
P81
P82
CS1
CS0
Vss
PA0
PA1
PA2
PA3
PA4
PA5
(J12)
(J10) 4.7k
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
5
4
C15 0.1µ/25v
CST12.00MTW
CF1
(J13) 4.7k
(J11)
(R101) 4.7k
C130 0.01µ/25v
C18
0.1µ
/25v
R13 4.7k
Q12
KRC101S
VCC
R80
4.7k
IC1 IXA029DR
G2
G3
from
Defrost More
Your
3+6
microwave
Pasta Beverage STOP
Grains
Center CLEAR
G1
G15
G11
Poultry
Meat
6
G8
G9
G14
WH-1
G10
TOUCH SCREEN
G7
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
R62 15k
28
29
30
31
32
33
34
35
36
37
38
39
40
LED1
Figure S-3. CPU Unit Circuit
KEY UNIT
Fish/
Seafood
Vegetables Frozen
Food
Baked Reheat Popcorn MINUTE
Potatoes
PLUS
START
G14
G12
Set UP
G13
G6
G5
Vcc
A11
A10
A9
A8
Vss
A7
A6
A5
A4
A3
A2
A1
A0
Vcc
D15
D14
D13
D12
D11
D10
Q80
KTC1027
A12
A11
A10
A9
A8
NC
NC
A18
A17
A7
A6
A5
A4
IC2
IXA030DR
NOTE :
D6
D13
D5
D12
D4
VCC
VCC
GND
D11
D3
D10
D2
D9
D1
CPU UNIT
LED2
WH-1
4 GND
A2
A1
1 A0
IC4
C110 0.01µ/25v
SDA 5
SCL
WP
VCC 8
R100 4.7k
C19 0.1µ/25v
: IF NOT SPECIFIED, 1/10W ± 5%
18
17
16
15
14
13
12
11
10
9
8
7
6
5
6
5
-
+
C112
0.1µ
/25v
4
R90 43kF
R91 18kF
C97 0.1µ/25v
R98 1M
C96 0.1µ/25v
7
IC3
8
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
GND1
VLCD1
VCC1
V50
V40
V30
V20
V10
GREF
IREFM
IREFP
VLCD2
VLCD3
VCC2
GND2
GND3
VCC3
OSC1
OSC2
OSC
CO
DCON
CL1
FLM
M
M/S
RES
CS
RS
WR
RD
VCC4
GND4
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
VCC5
GND5
VCC6
VLCD4
GND6
COM3
COM2
COM1
SEG3
SEG2
SEG1
COM50
COM49
COM51
SEG160
SEG159
SEG158
COM100
COM99
COM98
C95 0.1µ/25v
C94 0.1µ/25v
C93 0.1µ/25v
C92 0.1µ/25v
C91 0.1µ/25v
5
R73 15k
R72 15k
R71 15k
R70 15k
R69 15k
R68 15k
Q21
KRC101S
VR
C12 0.1µ/50v
R42
3.57kD
C22
10µ
/35v
GND
C21
0.1µ
/25v
C65 330pF/50v
–
C64 330pF/50v
D40 MA152WK
R11
1.2k
1/4w
R45 10k
R43 1.8kF
R44 360kF
R21 4.7k
+
C14 0.01µ/25v
R79 270k
VA
R77 270k
C11 0.1µ/50v
R10 470 1/2w
R76 270k
D80-81
1SS355
Q10 KTC1027
R75 270k
VA
C43 0.01µ/25v
C60 330pF/50v
C16 0.01µ/25v
IC6
M51953AFP
R78 270k
NC
VCC
V0
Cd
NC
NC
NC
GND
R74 270k
R81 27
0 ohm
VR
R82
3.3k
1/4w
R61 15k
C6
R60 15k
C5
C
C63 330pF/50v
4
C62 330pF/50v
3
C61 330pF/50v
(J80)
R63 15k
D80
D81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
AN0
Vref
Avcc
MD2
MD1
MD0
LWR
HWR
RD
AS
Vcc
XTAL
EXTAL
Vss
NMI
RES
STBY
P67
P62
P61
WAIT
Vss
A19
A18
A17
A16
A15
A14
A13
A12
1
TI0CA2
2
A20
3
Vcc
4
TM00
5
PB1
6
PB2
7
PB3
8
PB4
9
PB5
10
PB6
11
PB7
12
RES0
13
Vss
14
TxD0
15
P91
16
RxD0
17
P93
18
P94
19
P95
20
P40
21
P41
22
P42
23
P43
24
Vss
25
P44
26
P45
27
P46
28
P47
29
D8
30
D9
R67 15k
35
R66 15k
3
R65 15k
G
R64 15k
27
26
25
24
23
22
21
20
19
R110
4.7k
2
A13
A14
A15
A16
BYTE
GND
D15/A-1
D7
D14
H
+
41
A3
42
A2
43
A1
44
A0
45
CE
1
GND
2
0E
3
D0
4
D8
1
2
R111
4.7k
1
R112
47k
F
C98
0.01µ
/25v
E
TH1
5G2M40B333J
D
R92 20kF
B
IC5 IXA031DR
VR
R -340DK
R-340DW
6
A
A
B
C
D
E
F
G
H
LIQUID CRYSTAL DISPLAY
100 x 160 Dots
R113
150
1/2w
C13 47µ/16v
R- 340DK
R-340DW
2
1
4
3
6
5
A
A
VH
CN - B
B
B
1
SP30
C
SH-B
E
1
2
SH-A
(GREEN)
CN - C
Q1 B
R3
11
ZD1
R1
R2
C
DU
OM
D22
DIP
C2
C1
D1
RY3
D
D20
D
OM
DU
OM
1
7
D21
DU
RY2
E
5
T1
3
XA
F
S
P
RY1
E
F
2
1
VRS1
2
(J1)
1
VH
CN - A
QKITPB031MREO
G
G
H
H
Figure S-5. Printed Wiring Board of Power Unit
1
2
4
3
36
5
6
R - 340DK
R -340DW
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
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AG
AH
AL
AL
AQ
AQ
AU
AV
BK
AV
AU
AH
AG
AE
AS
AQ
AS
AP
BM
BC
1
1
1
2
1
BC
AZ
AX
AC
AH
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
6
BC
AC
AH
AD
AF
AA
AF
AG
AC
AA
AA
AK
AM
AG
AT
AE
AA
BE
BL
BL
BG
BG
AA
1
1
1
1
1
1
1
1
1
1
1
1
1
AU
AF
AH
AD
AL
AT
-AX
AG
AH
AK
AE
AC
ELECTRIC PARTS
*
∆*
*
1- 1
1- 2
1- 3
1- 4
1- 5
1- 5
1- 6
1- 7
1- 8
1- 9
1- 9
1-10
1-11
1-11
1-12
1-12
1-12
1-13
1-14
1-15
QSW-MA147WRZZ
QFSHDA009WRE0
FFS-BA021WRK0
RTHM-A078WRE0
FACCDA083WREZ
FACCDA085WRE0
FH-DZA094WRKZ
RC-QZA234WRE0
RV-MZA288WRE0
RMOTEA383WRE0
RMOTEA355WRE0
QSOCLA021WRE0
RLMPTA068WRE0
RLMPTA030WRE0
RMOTDA161WRE0
RMOTDA229WRE0
RMOTDA211WRE0
RTHM-A080WRE0
RTRN-A603WRZZ
FDTCTA197WRK0
2nd interlock switch / door sensing switch
Fuse holder
Monitor fuse 20A and monitor switch (V-16G-2C25) assembly
Thermal cut-out 125 deg.
Power supply cord
Power supply cord (Interchangeable)
High voltage rectifier assembly
High voltage capacitor
Magnetron
Fan motor
Fan motor (Interchangeable)
Oven lamp socket
Oven lamp
Oven lamp (Interchangeable)
Turntable motor
Turntable motor (Interchangeable)
Turntable motor (Interchangeable)
Thermal cut-out 145 deg.
Power transformer
AH sensor assebly
22222-
GCABUA744WRPZ
GCABUA690WRP0
GDAI-A316WRW0
GLEGPA074WRE0
GLEGPA077WRF0
Outer case cabinet [R-340DK]
Outer case cabinet [R-340DW]
Bottom plate
Foot
Leg
CABINET PARTS
1
1
2
3
4
CONTROL PANEL PARTS
3- 1
3- 1A
3- 1B
3- 1C
3- 1D
C1
C2
D1
Q1
R1
R2-3
RY1
RY2
SP1
T1
VRS1
ZD1
3- 2
3- 3
3- 3
3- 3-1
3- 3-1
3- 4
DPWBFC042WRKZ
QCNCMA446DRE0
FW-VZA260DREZ
FW-VZA195DRE0
FW-VZA256DREZ
RC-KZA087DRE0
VCEAB31VW108M
RSRCDA013DRE0
VS2SD1859//-3
VRD-B12EF242J
VRS-B13AA910J
RRLY-A076DRE0
RRLY-A113DRE0
RALM-A014DRE0
RTRNPA113DRE0
RH-VZA032DRE0
VHEHZ161///-1
DPWBFC041WRKZ
FPNLCB492WRKZ
FPNLCB495WRKZ
DUNTKA716WRKZ
DUNTKA717WRKZ
XEPSD30P08XS0
Power unit
2-pin connector (CN-A)
11pin lead wire (CN-C)
Switch harness A (SH-A)
Switch harness B (SH-B)
Capacitor
0.1 uF
50V
Capacitor
1000 uF
35V
Diode bridge (S1NB10)
Transistor (2SD1859R)
Resistor
2.4k ohm
1/4W
Resistor
91 ohm
1W
Relay (OMIF-S-124LM)
Relay (DU24D1-1P(M)-R)
Buzzer (PKM22EPT)
Transformer
Varistor (10G471K)
Zener diode (HZ16-1)
CPU unit
Control panel frame with key unit [R-340DK]
Control panel frame with key unit [R-340DW]
Key unit [R-340DK]
Key unit [R-340DW]
Screw; 3mm x 8mm
4- 1
4- 2
4- 3
4- 4
4- 5
4- 6
4- 7
4- 8
4- 9
4-10
4-11
4-12
4-13
PDUC-A724WRF0
PPACGA084WRF0
PHOK-A116WRFZ
LBNDKA099WRW0
NFANJA029WRE0
PDUC-A728WRW0
*************
LANGFA196WRWZ
LANG-A067WRPZ
LANG-A063WRPZ
LANG-A064WRPZ
NCPL-A053WRFZ
PCUSUA511WRP0
Air separater
TTM packing
Latch hook
Capacitor holder
Fan blade
Fan duct
Oven cavity (Not a replaceable part)
Chassis support
Magnetron duct
Air guide
Barrier
Coupling
Cushion
OVEN PARTS
∆
∆
37
R -3 40DK
R-340DW
REF. NO.
4-14
4-15
4-16
4-17
4-18
4-19
4-20
4-21
4-22
4-23
4-24
4-25
PART NO.
PCOVPA349WRE0
PCUSGA339WRP0
PCUSGA533WRP0
PCUSUA512WRP0
PCUSGA529WRP0
PCUSUA527WRP0
PCUSUA157WRP0
PCUSUA212WRP0
PCUSUA474WRP0
PCUSUA376WRP0
LANG-A065WRWZ
LANGTA365WRPZ
DESCRIPTION
Waveguide cover
Cushion
Cushion
Cushion
Cushion
Cushion
Cushion
Cushion
Cushion
Cushion
Sensor guide
Sensor mounting angle
55555555555-
FDORFA332WRT0
PSHEPA382WRE0
GWAKPA727WRRZ
GWAKPA728WRRZ
HPNL-A740WRRZ
HPNL-A742WRRZ
LSTPPA193WRFZ
MSPRTA187WRE0
XCPSD40P08000
PCUSUA461WRP0
GCOVHA417WRFZ
Door panel
Sealer film
Door frame [R-340DK]
Door frame [R-340DW]
Door screen [R-340DK]
Door screen [R-340DW]
Latch head
Latch spring
Screw : 4mm x 8mm
Cushion
Choke cover
Q'TY
1
2
1
1
1
1
2
1
2
2
1
1
CODE
AE
AG
AD
AB
AC
AE
AC
AB
AC
AF
AH
AH
1
1
1
1
1
1
1
1
4
1
1
BD
AH
AX
AX
AS
AS
AE
AC
AA
AB
AG
1
1
1
1
1
1
1
1
1
AQ
AR
AU
AF
AB
AC
AC
AK
AC
9
3
6
1
3
17
1
1
2
2
AA
AA
AA
AA
AA
AA
AA
AA
AC
AA
DOOR PARTS
∆
∆
∆
∆
1
2
3
3
4
4
5
6
7
8
9
MISCELLANEOUS
*
666666666-
1
2
3
4
5
6
7
8
9
FROLPA079WRK0
NTNT-A079WRE0
FW-VZB771WREZ
QW-QZA150WRE0
PZET-A012WRE0
TCAUAA166WRR0
TCAUAA254WRR0
TINSEA836WRRZ
TCAUAA255WRR0
Turntable support
Turntable tray
Main wire harness
High voltage wire B
Terminal insulator
DHHS caution label
Monitor caution label
Instruction book
Screw caution
7777777777-
1
2
3
4
5
6
7
7
8
9
XHPSD40P08K00
XHPSD30P06000
XHTSD40P08RV0
XHTSD40P12RV0
XOTSD40P12RV0
XOTSD40P12000
XOTSF40P08000
XOTSE40P08000
LX-CZA070WRE0
LX-CZ0052WRE0
Screw :
Screw :
Screw :
Screw :
Screw :
Screw :
Screw :
Screw :
Special
Special
SCREWS,NUTS AND WASHERS
4mm x
3mm x
4mm x
4mm x
4mm x
4mm x
4mm x
4mm x
screw
screw
8mm
6mm
8mm
12mm
12mm
12mm
8mm [R-340DK]
8mm [R-340DW]
(Torx tamper proof screw)
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 - 340DK
R -340DW
2
1
4
3
7-5
2-1
OVEN AND CABINET PARTS
6
5
7-8
A
A
7-5
4-23
4-25
7-1
4-22
1-15
7-2
1-10
4-17
B
7-8
7-2
1-11
1-13
1-4
4-20
1-8
7-3
7-6
7-6
6-7
7-7
7-3
4-13
4-24
4-23
B
6-6
4-9
4-11
C
C
7-6
7-3
4-19
4-7
4-10
7-3
6-9
1-5
D
D
7-3
7-4
4-20
4-22
7-1
4-12
1-7
4-21
1-6
4-15
E
7-6
E
1-1
7-9
4-14
6-2
4-4
4-2
4-18
1-12
1-2
7-6
1-3
4-8
4-5
F
7-1
6-1
1-14
4-3
7-3
7-6
1-1
F
7-5
7-1
4-16
4-1
2-2
4-15
4-6
2-4
G
1-9
G
7-6
2-3
7-6
H
H
7-6
7-6
7-6
2-3
1
2
4
3
39
5
6
R -3 40DK
R-340DW
2
1
4
3
CONTROL PANEL PARTS
3-4
3-2
A
6
5
A
3-3
3-4
B
B
3-4
3-3-1
3-1
5-9
C
C
5-7
5-2
5-7
D
D
5-1
DOOR PARTS
5-7
E
E
5-3
5-7
5-5
F
F
5-4
5-6
5-8
G
G
MISCELLANEOUS
6-3
(CAPACITOR)
6-4
H
H
6-5
Actual wire harness may be different from illustration.
1
2
4
3
40
5
6
R - 340DK
R -340DW
2
1
4
3
6
5
PACKING AND ACCESSORIES
A
A
TOP PAD ASSEMBLY
FPADBA416WRKZ
DOOR PROTECTION SHEET
SPADPA204WRE0
B
B
PLASTIC BAG
SSAKHA034WRE0
6- 8
INSTRUCTION BOOK
& PRINTING MATTER
6- 2
TURNTABLE TRAY
C
C
BOTTOM PAD ASSEMBLY
FPADBA417WRKZ
6- 1 TURNTABLE SUPPORT
TRAY PACK
INTO THE
OVEN CAVITY
SPADFA451WRE0
D
D
Not replaceable items.
PACKING CASE
SPAKCD371WREZ [R-340DK]
SPAKCD372WREZ [R-340DW]
E
E
F
F
G
G
H
H
1
2
4
3
41
5
6
R -3 40DK
R-340DW
COPYRIGHT © 2000 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.
2000 SHARP CORP. (1S2.530E) Printed in U.S.A
42