R-1750
R-1751
R-1752
R-1754
SERVICE MANUAL
S8019R1750X//
OVER THE RANGE
MICROWAVE OVEN
MODELS
ONE TOUCH
SENSOR
12 : 45 PM
Reheat
7
2
5
8
3
6
9
Minute
Plus +
0
Kitchen
Timer
1
4
T O U C H
MINUTE
PLUS
Popcoon
Baked
Potatoes
Beverage
Center
S C R E E N
STOP/
CLEAR
START
6x6 NO GUESS COOKING
6 Categories + 36 Foods
Meats
Vegetables
Poultry
Fish/
Seafood
Frozen
Food
Pasta
Grains
Fan
Options
Light
Options
Turntable
On/Off
Keep
Warm
Defrost
3+6
MORE
FROM YOUR
MICROWAVE
6x6
Set Up
R-1750
R-1751
R-1752
R-1754
In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should
be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage
and current. Contact with the following parts may result in a severe, possibly fatal, electrical shock. (Inverter unit
that includes High Voltage Capacitor, High Voltage Power Transformer, High Voltage Rectifier and Heat sink etc.,
and Magnetron, 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 ............................................................................................................................ 14
TEST PROCEDURE ............................................................................................................................................ 16
TOUCH CONTROL PANEL ASSEMBLY ............................................................................................................ 27
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 33
PICTORIAL DIAGRAM ........................................................................................................................................ 41
POWER UNIT CIRCUIT ...................................................................................................................................... 42
LSI UNIT CIRCUIT ............................................................................................................................................... 43
PRINTED WIRING BOARD ................................................................................................................................. 44
PARTS LIST ........................................................................................................................................................ 45
PACKING AND ACCESSORIES ......................................................................................................................... 50
SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-1750
R-1751
R-1752
R-1754
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave
source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal and sealing
surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of
dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity,
and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and
transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the
oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be performed
on each oven prior to release to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS
CORPORATION immediately @1-800-237-4277.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven and
2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's Center for
Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found with
emissions in excess of 4mW/cm2 . The owner of the unit should be instructed not to use the unit until the
oven has been brought into compliance.
DANGER CAUTION
HIGH VOLTAGE
Do not energize a microwave oven with the outer case cabinet removed, because a microwave oven
generates High Voltage in the circuit.
If you intend to operate the oven employing the high frequency switching power converter circuit, you should
take special precautions to avoid an electrical shock hazard.
The high voltage transformer, high voltage capacitor and high voltage diode have energized high voltage
potential approx. 8 KV.
The aluminium heat sink is connected to the switching power transistor Collector pole, and has an energized
high voltage potential approx. 650V peak.
DO NOT ACCESS THE HIGH VOLTAGE TRANSFORMER, HIGH VOLTAGE CAPACITOR, HIGH
VOLTAGE DIODE AND HEAT SINK WHEN THE POWER SUPPLY IS CONNECTED TO AN ELECTRICAL
OUTLET.
R-1750
R-1751
R-1752
R-1754
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)
Inverter unit that includes High Voltage Capacitor,
High Voltage Power Transformer, High Voltage
Rectifier, Heat sink etc., and Magnetron, High
Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
Don't Touch !
Danger High Voltage
1. Disconnect the power supply cord, and then remove
outer case.
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Reconnect the leads to the primary of the inverter unit.
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. To discharge high voltage capacitor, wait for 60 seconds.
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. To discharge high voltage capacitor, wait for 60 seconds.
4. Disconnect the leads to the primary of the inverter unit.
5. Ensure that these 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 microwave leakage test should be carried out.
When the testing is completed,
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SERVICING FOR INVERTER UNIT
WARNING
This inverter unit contains circuitry capable of producing high voltage and high current. Contact with any part
of the high voltage will result in electrocution.
DO NOT ACCESS ANY PARTS OF INVERTER UNIT WITH POWER SUPPLY CONNECTED.
DO NOT OPERATE INVERTER UNIT ITSELF.
It is dangerous because this unit contains high voltage components.
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.
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SERVICE MANUAL
PRODUCT DESCRIPTION
OVER THE RANGE
MICROWAVE OVEN
R-1750 / R-1751 / R-1752 / R-1754
GENERAL INFORMATION
FOREWORD
This Manual has been prepared to provide Sharp Electronics Corp.
Service Personnel with Operation and Service Information for the
SHARP OVER THE RANGE MICROWAVE OVEN, R-1750, R-1751,
R-1752, R-1754.
It is recommended that service personnel carefully study the entire
text of this manual so that they will be qualified to render satisfactory
customer service.
Check the interlock switches and the door seal carefully. Special
attention should be given to avoid electrical shock and microwave
radiation hazard.
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is no other visible damage with the oven.
OPERATION
TROUBLESHOOTING GUIDE AND
TEST PROCEDURE
TOUCH CONTROL PANEL
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
WIRING DIAGRAM
Servicing and repair work must be carried out only by trained service
personnel.
PARTS LIST
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;
Inverter unit that includes High Voltage Capacitor, High
Voltage Power Transformer, High Voltage Rectifier, Heat
sink, etc., and Magnetron, High Voltage Harness etc.;
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 wrapper 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
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PRODUCT SPECIFICATION
ITEM
DESCRIPTION
Power Requirements
120 Volts / 14 Amperes / 1600 W
60 Hertz
Single phase, 3 wire grounded
Power Output
1.6 Cubic Feet
1100 watts (IEC TEST PROCEDURE)
Operating frequency of 2450MHz
Width 29-15/16"
Height 16-3/8"
Depth 16- 1/8" (Not including the door handle)
Width 21"
Height 8-7/8"
Depth 14-7/16"
Hood lamp
Hood fan
2 bulbs, 20W x 2, Incandescent light bulbs
Approx. 300 C.F.M.
Control Complement
Touch Control System
Clock ( 1:00 - 12:59 )
Timer (0 - 99 min. 99 seconds)
Microwave Power for Variable Cooking
Repetition Rate;
P-HI .................................................. Full power throughout the cooking time
P-90 .................................................................... approx. 90% of Full Power
P-80 .................................................................... approx. 80% of Full Power
P-70 .................................................................... approx. 70% of Full Power
P-60 .................................................................... approx. 60% of Full Power
P-50 .................................................................... approx. 50% of Full Power
P-40 .................................................................... approx. 40% of Full Power
P-30 .................................................................... approx. 30% of Full Power
P-20 .................................................................... approx. 20% of Full Power
P-10 .................................................................... approx. 10% of Full Power
P-0 .................................................... No power throughout the cooking time
Case Dimensions
Cooking Cavity Dimensions
TOUCH SCREEN, ONE TOUCH SENSOR pads, Beverage Center pad
Keep Warm pad, Defrost pad, MINUTE PLUS pad, STOP/CLEAR pad
START pad, 6 x 6 NO GUESS COOKING pads
MORE FROM YOUR MICROWAVE 6 x 6 pad, Fan Options pad
Light Options pad, Turntable On/Off pad, Set Up pad
Oven Cavity Light
20W x 1 Incandescent light bulb
Safety Standard
UL Listed
FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
Weight
Approx. 46 lbs.
GENERAL INFORMATION
GROUNDING INSTRUCTIONS
This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed
and grounded in accordance with the National Electrical Code and local codes and ordinances.
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the
electric current.
WARNING: Improper use of the grounding plug can result in a risk of electric shock.
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Electrical Requirements
The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE
GROUNDING PIN FROM THE PLUG.
The power supply cord and plug must be connected to a separate 120 Volt AC, 60 Hz, 15 Amp. or more dedicated line, using
a grounded receptacle. The receptacle should be located inside the cabinet directly above the Microwave Oven/Hood
system mounting location.
3-Pronged Plug
Grounded
Receptacle Box
Grounding Pin
3-Pronged Receptacle
OVEN DIAGRAM
9
9
1
8
3
5
7
14
2
6
4
12
13
10
11
1.
2.
3.
4.
5.
Oven door with see-through window.
Door hinges.
Stirrer cover.
Turntable motor shaft.
Oven lamp.
It will light when oven is operating or door is open.
6. Door latches.
The oven will not operate unless the door is securely closed.
7. Auto-Touch control panel.
5
8. Touch Screen.
9. Ventilation openings.
10. Light Cover.
11. Grease filters.
12. Removable turntable.
The turntable will rotate clockwise or counterclockwise.
Only remove for cleaning.
13. Removable turntable support.
14. Power supply cord
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CONTROL PANEL
ONE TOUCH
SENSOR
12 : 45 PM
See note.
Reheat
1
4
7
2
5
8
3
6
9
Minute
Plus +
0
Kitchen
Timer
Popcoon
Baked
Potatoes
See note.
Beverage
Center
T O U C H
See note.
MINUTE
PLUS
S C R E E N
STOP/
CLEAR
START
6x6 NO GUESS COOKING
6 Categories + 36 Foods
Keep
Warm
Defrost
3+6
Meats
Vegetables
Poultry
MORE
FROM YOUR
MICROWAVE
Fish/
Seafood
Frozen
Food
Pasta
Grains
6x6
Fan
Options
Light
Options
Turntable
On/Off
Set Up
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.
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
4. The following is an example of the Home page when
the time of the day is set to 12:30 p.m..
The following is a description of component functions during
oven operation.
12 : 30 PM
OFF CONDITION
Closing the door activates the stop switch, primary interlock
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 no keys are touched within 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.
1
2
3
4
5
6
7
8
9
Minute
Plus +
0
Kitchen
Timer
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 being plugged in.
COOKING CONDITION
Program desired cooking time touching the NUMBER pads.
When the START pad is touched, the following operations
occur:
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programmed at the ratio of ON time and OFF time within 32
sec./ cycle time base.
1. The contacts of relays are closed and components
connected to the relays are turned on as follows.
(For details, refer to Figure O-2)
RELAY
RY1
RY2
RY3, RY4
CONNECTION BETWEEN POWER SETTING AND ON/
OFF TIME OF INVERTER UNIT.
CONNECTED COMPONENTS
Oven lamp / Fan motor / Stirrer motor
Turntable motor
Hood fan motor
OUTPUT POWER SETTING
Power 100%
Power 90%
Power 80%
Power 70%
Power 60%
Power 50%
Power 40%
Power 30%
Power 20%
Power 10%
Power 0%
2. 120 volts A.C. is supplied to the inverter unit and is
converted in order to power of the magnetron by the high
frequency switching power circuit. The frequency is
approx. 27 _ 40 KHz.
3. The filament winding voltage of H.V. transformer heats
the magnetron filament and the H.V. winding gives a
high voltage approx. 2 KV to activaite a voltage doubler
circuit. Then approx. 4KV peak voltage power is supplied
to the magnetron cathode terminal.
4. The microwave energy produced by the magnetron is
channelled through the waveguide into the cavity feedbox, and then into the cavity where the food is placed to
be cooked.
5. Upon completion of the cooking time, the inverter unit,
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, stop switch, secondary interlock switch and primary
interlock switch are activated with the following results.
The circuits to the stirrer motor, the cooling fan motor, the
turntable motor, and the inverter unit are de-energized,
and the touch screen displays the time still remaining in
the cook cycle when the door was opened.
7. The monitor switch is electrically monitoring the operation
of the secondary interlock switch and primary interlock
switch and is mechanically associated with the door so
that it will function in the following sequence.
(1) When the door opens from a closed position, the
primary interlock switch and secondary interlock
switch open their contacts, and then the monitor
switch contacts close. And contacts of the relay
(RY1) remain closed.
(2) When the door is closed from the open position, the
monitor switch contacts first open and the stop
switch contacts open, and then the contacts of the
secondary interlock switch and primary interlock
switch close. And contacts of the relay (RY1) open.
If the secondary interlock switch and primary interlock
switch fail with their contacts closed when the door is
opened, the closing of the monitor switch contacts will form
a short circuit through the monitor fuse, secondary interlock
switch, primary interlock switch and relay (RY1) causing the
monitor fuse to blow.
ON TIME
OFF TIME
Continue operation
26 sec.
22 sec.
16 sec.
8 sec.
0 sec.
6 sec.
10 sec.
16 sec.
24 sec.
32 sec.
Note: The ON/OFF time ratio does not correspond with
the percentage of microwave power, because
approx. 3 seconds are needed for heating of the
magnetron filament.
SENSOR COOKING CONDITION
Using the Sensor 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 input into the LSI.
An example of how sensor works: (BAKED POTATOES)
1. Potatoes at room temperature. Vapor is emitted very
MIC
slowly.
RO
WA
VE
2. Heat Potatoes. Moisture and humidity is emitted rapidly.
You can smell the aroma as it cooks.
AH SENSOR
VARIABLE COOKING
When Variable Cooking Power is programmed, the 120
volts A.C. is supplied to the inverter unit which is operated
by the control unit. Microwave power operation is as follows:
The oven can be set for any of 11 power levels: 0% to
100%(HIGH). The variable cooking power less than 40% is
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3. Sensor detects moisture and humidity and calculates
cooking time and variable power.
: AIR FLOW
TO DUCT
TO DUCT
HOOD FAN MOTOR
Cooking Sequence.
1. Operate the oven in sensor cooking mode by referring to
the operation manual.
NOTE: The oven should not be operated on SENSOR
immediately after plugging in the unit. Wait two
minutes before cooking on SENSOR.
2. The coil of shut-off relay (RY-1) is energized, the turntable
motor, oven lamp and cooling fan motor are turned on,
but the inverter unit is not turned on.
3. After about 32 seconds, the cook relay (RY-2) is
energized. The power transformer is turned on,
microwave energy is produced and first stage is started.
The 32 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 is de-energized and the inverter unit,
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.
HOOD
INTAKE
DUCT
GREASE
FILTER
2. HORIZONTAL VENTING
The air handing is the same as VERTICAL VENTING
except that the final air discharge is directed horizontally
out from the top rear of the oven into the customer's vent
system.
: AIR FLOW
HOOD FAN MOTOR
TO DUCT
HOOD
INTAKE
DUCT
GREASE
FILTER
3. RE-CIRCULATION (INSIDE VENTING)
The air handing is the same as VERTICAL VENTING
except that the final air discharge is directed horizontally
through the upper front of the oven into the kitchen. In
this case, the accessory charcoal filter RK-230 must be
provided to filter the air before it leaves the oven.
The following are the sensor cooking menus.
Reheat
Popcorn
Baked potatoes
Vegetables
Ground beef or 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, Bacon, Microwave pizza of More From Your
Microwave.
: AIR FLOW
HOOD FAN MOTOR
HOOD EXHAUST
LOUVER
CHARCOAL
FILTER
HOOD
INTAKE
DUCT
BASIC OPERATION OF INVERTER CIRCUIT
Basic circuit diagram is shown Figure A-1.
AC line voltage is rectified and converted to direct-current
voltage (DC. Voltage). By switching the power transistor Q1
ON and OFF, High frequency current (about 27 - 40 KHz) is
generated controlled by the IC of the inverter unit. OFF-time
of the transistor Q1 is nearly constant. That is, on-time is
varied. It is a kind of Pulse Width Modulation (PWM).
Because off-time is constant, switching frequency is varied
in response to the length of on-time and output power of
magnetron is proportional to the length of on-time. Therefore, the frequency of inverter becomes low for high output
and high for low output.
VENTILATION METHODS HOT AIR EXHAUST
1. VERTICAL VENTING
For this venting method, hot air rising from the
conventional range below is drawn in by the hood fan
motor through the grease filters at the right and left sides
of the base cover, up through the right and left sides of
the oven cavity, then discharged vertically at rear center
top of the oven, into the customer's vent system.
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being destroyed. After approx. 60 millisecond, it starts
generating the driving signal from the minimum pulse width
and expands the length of on-time slowly until the current
of the main circuit reaches the target level.
Wave-form of main parts are shown in Figure A-2.
During off-time, flyback voltage appears on the primary
winding of the high voltage transformer. The off-time depends on the inductance of the transformer and capacitance of the resonant capacitor C3. Synchronous circuit
generates the timing signal by detecting the flyback voltage. The power transistor Q1 is periodically switched on
when the collector voltage returns to zero (0) volt. High
voltage (about 2 KV) appears on secondary winding of the
transformer. The full-wave voltage doubler circuit increase
to about 4 KV and is applied to the magnetron. The efficiency of the inverter unit itself is approx. 93%, and equal to
that of current efficiency. Ferrite core is used for the high
voltage transformer. It is superior to silicon steel core at
high frequency, low magnetic loss. The power level is
determined by the touch control board, and the PWM data
corresponding to the level is set to the IC of the inverter unit
through the control lines. The IC controls on-time of transistor Q1 by comparing the average value of the primary
current with the magnitude of the power level data. The IC
has the protection circuit which detects over-current of the
main circuit and the high voltage circuit, over-voltage of the
power transistor Q1 and AC power interruption. When
abnormal phenomenon is detected, the IC pauses on the
moment in order to protect the power transistor Q1 from
Driving signal
Collector
current of Q1
Collector
voltage of Q1
Secondary voltage
of high voltage
transformer
Synchronous
signal
Figure A-2. Switching Wave-form
Choke coil
Bridge diode
High voltage
transformer
C2
AC 120V / 60 Hz
C3
Power
transistor
Q1
A
D11
C11
C12
D12
+V
IC
Synchronous
Signal for AC.
R
R
102 103
Driving
Circuit
Synchronous Circuit
Voltage Detector
Overcurrent and
Overvoltage Detector
Output Control
Signal
Average Current
A
Figure A-1. Basic Circuit
9
Magnetron
R-1750
R-1751
R-1752
R-1754
OVEN
THERMAL CUT-OUT
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
MAGNETRON
TEMPERATURE FUSE
COM.
CONTROL UNIT
F1
FUSE
20A
AH SENSOR
F2
F3
B7
RY3
H1
H2
H3
RY4
High
B3
A1
FA
N.C.
RY2
HOOD
MOTOR
A1
A3
F
STOP
SWITCH
B9
A5
A7
F
E2
RY1
FA
MAGNETRON
Low
HOOD
CAPACITOR
FA
N.O.
HL
HL
FAN
MOTOR
TTM
HOOD
LAMP
FM
OVEN LAMP
TURNTABLE
MOTOR
AC3
OL
PRIMARY
INTERLOCK
SWITCH
STM
MONITOR
SWITCH
B1
120 V AC. GND
60 Hz
MAGNETRON
GRN
WHT
A3
E1
STIRRER
MOTOR
HOOD FAN
THERMAL
CUT OUT
SSR
BLK
B5
M
INVERTER UNIT
SECONDARY
INTERLOCK
SWITCH
Figure O-1. Oven Schematic-Off Condition
OVEN
THERMAL CUT-OUT
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. COOKING TIME PROGRAMMED
3. VARIABLE COOKING CONTROL "HIGH"
4. "START" PAD TOUCHED
MAGNETRON
TEMPERATURE FUSE
COM.
CONTROL UNIT
F1
FUSE
20A
AH SENSOR
F2
F3
B7
RY3
H1
H2
B3
A3
E1
A1
FA
N.C.
GRN
Low
RY2
A1
A3
A5
A7
F
E2
RY1
N.O.
HL
FM
OL
PRIMARY
INTERLOCK
SWITCH
STIRRER
MOTOR
TTM
OVEN LAMP
AC3
HOOD
LAMP
HL
B9
FAN
MOTOR
HOOD
MOTOR
F
STOP
SWITCH
HOOD
CAPACITOR
STM
MONITOR
SWITCH
B1
120 V AC. GND
60 Hz
WHT
H3
RY4
High
TURNTABLE
MOTOR
HOOD FAN
THERMAL
CUT OUT
SSR
BLK
B5
SECONDARY
INTERLOCK
SWITCH
Figure O-2. Oven Schematic-Cooking Condition
10
M
INVERTER UNIT
PWM
MCK
VS
1
2
3
1
D21
2
D20
3
4
C20
0.01µ/16V
R20
1.2KF
PH1
47K
ZD30
(J2)
h
4.7K
e
Q50
D23
R35
g
D30
VR1
330
D22
4.7K
f
R63
120K
C30
R63
VRS2
C61
R30
1000p / 50V
C62
- +
10µ / 50V
M
AC3
CN-A
PD1
R61
4.7K
11
Figure O-3. Inverter Unit Circuit
1000p / 50V
39K
1M
R62
R25
TH2
9
GND
PA
EN
INT
1
OSC
OSC
8MHZ
CF1
RBV-2506
D1
(IZA406DR)
D32
IC1 LR38166
IA
10
VP2
VP0
VP1
OUT
AGND
VS
18
C31
ZD32
ZD33
4.7K
R5
C35
VR
C4
100p/50V
VC
- +
1µ / 50V
R31
C24
1.8K
R44
D16
4.7K
- +
100µ / 35V
R73
R24
R6
L2
39K
- +
1µ / 50V
1.3K/ 5W
VCC
R34
R21
C40
R22
1.2K
1/2W
ZD31
18K
220p / 50V
R4
0.9µ / 200V
R2
M1
Q51
M2
1/ 2W 33K
C2
10K
Q4
1.5K
Q2
Q3
R45
R51
39K
430
1.3KF
R50
VRS3
300F
36K
1/2W
R43
C3
R55
5.6KF
C50
T1
0.01µ/50V
R54
P2
P1
2.2KF
33K
1/2W
R42
0.3µ / 580V
(R72)
VE
Q1
R56 (ZD50)
10K
D50
C41
100p / 50V
S1
S2
H2
10K
H1
R40
VS
(CN-A)
D12
D11
MCK
(CN-A)
ZD40
C70
C12
4
Q70 3
VC
D100
R103
R102
1
4
2.2/ 1W
2
3
PD2
C11
0.06µ
3100V
R101
C21
1000p/ 50V
PD3
2.2/ 1W
0.1µ/ 25V
R71
100K
R70
0.03µ
2800V
R11
100
120M
(H.V.RESISTOR)
D17
2
1
FA
F
ZD70
47
VC
BF20
MAGNETRON
R-1750
R-1751
R-1752
R-1754
R-1750
R-1751
R-1752
R-1754
M
D1
R31
ZD33
+
RED
C35
E
Q3
ZD32
J3
R40
D50
R44
ZD40
C41
D70
D100
R103
S1
R45
M1
S2
R2
PH1
R42
R43
J6
R101
R102
G
C
J8
E
P2
H1
Q1
J10
VRS3
VRS4
C12
H2
F
P1
D12
FA
HS2
R73
R72
C3
HS1
0.003µF
C11
FA
F
D11
R11
SOLDER
L2
VRS2
CT1
C4
Q2
J4
PD2
M2
J9
0.006µF
Figure O-4. Printed Wiring Board for Inverter Unit Circuit
C2
12
WR
DANGER H.V.
BLUE
AC3
D22
R34
TH2 R5
R6
R25
Q4
C21
R20
D23
+
E
+
C50
D32
C51
R30
EARTH
J5
CMK-P3X
94V - 0
R
ZD70
Q51
E
R71
R50
C31
IC1
R56
R71
Q70
B
PD3
R54
D16
ZD30
J11
R4
R55
TH1
J2
R24
R22
C50
VR1
C30
18
10
J1
+
1
D20
D21
1
E
R51
ZD50
C70
R21
C24
CF1
C61
R53
R62
CN-A
R70
D30
ZD31
3
E
Q50
R35
C62
R63
9
3
R61
RD039AF
PD1
J7
R-1750
R-1751
R-1752
R-1754
DESCRIPTION AND FUNCTION OF COMPONENTS
DOOR OPEN MECHANISM
LOCK SWITCH AND MONITOR SWITCH FOR
PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE").
NOTE: MONITOR FUSE AND SWITCH ARE REPLACED
AS AN ASSEMBLY
The door is opened by pulling the door handle, refer to the
Figure D-1.
Latch
Hook
Stop
Switch
TEMPERATURE FUSE (MG)
Latch
Heads
The temperature fuse located near the waveguide 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 temperature fuse remains
closed. However, the temperature fuse will open at 302˚F
(150˚C) causing the oven to shut down.
Primary
Interlock
Switch
Monitor
Fuse
Door
Monitor
Switch
THERMAL CUT-OUT (HOOD )
Secondary
Interlock
Switch
This thermal cut-out located on the right base plate. It is
designed to automatically turn on the hood fan motor
whenever the hot air rising from the conventional range
below causes the temperature at the thermal cut-out to rise
to 140˚F (60˚C) or higher, thus removing this hot air from
around microwave oven. When the temperature around the
thermal cut-out drops to 113˚F (45˚C) or lower, the thermal
cut-out shuts off the hood fan motor.
Figure D-1. Door Open Mechanism
STOP, PRIMARY INTERLOCK AND SECONDARY
INTERLOCK SWITCHES
The secondary interlock switch is mounted in the lower
position of the latch hook and the stop switch is mounted in
the upper position of the latch hook. The primary interlock
switch is also 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 circuit to all components. A cook cycle cannot take place until the door is firmly
closed thereby activating both interlock switches.
THERMAL CUT-OUT (OVEN )
This thermal cut-out is located on the top of the oven cavity.
It is designed to prevent damage to the oven unit if the food
in the oven catches fire due to overheating produced by
improper setting of cooking time or failure of control unit.
Under normal operation, the thermal cut-out remains closed.
However, the thermal cut-out will open at 293˚F (145˚C)
causing the oven to shut down.
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 switch and secondary interlock switch fail to open
when the door is opened.
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. Turntable will turn in either
direction. The turntable motor can be turned off by touching
TURNTABLE ON/OFF pad.
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 switch and
secondary interlock switch are in the OFF condition
(contacts open) due to their being normally open contact
switches. And the contacts of relay (RY1) are in the ON
condition (contacts close).
2. As the door goes to a closed position, the monitor switch
contacts are first opened and the stop switch contacts
close, and then the primary interlock 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 switch
and secondary interlock switch contacts fail to open, the
monitor fuse blows simultaneously with closing of the
monitor switch contacts.
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE TEST THE STOP SWITCH, PRIMARY
INTERLOCK SWITCH, SECONDARY INTER-
COOLING FAN MOTOR
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.
HOOD FAN MOTOR
The hood fan motor is a two-speed, single-phase, double
pole induction type, requiring a hood fan capacitor. It is
located outside the upper rear part of the oven cavity, is to
remove, from around the oven, hot air rising from the
conventional electric or gas range over which it is installed.
This air is then expelled either vertically or horizontally
through the customer supplied duct system, or discharged
back into the kitchen.
13
R-1750
R-1751
R-1752
R-1754
STIRRER MOTOR
HOOD LAMP
The stirrer motor drives the stirrer fan to stir the microwave
radiation from the waveguide.
The hood lamps are mounted at the hood lamp angle on the
base cover. The hood lamps can be turned off and on by
touching the Light Options pad. And also the brightness can
be varied to high or low by touching the Light Options pad.
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 switch and secondary interlock switch before replacing the monitor fuse. If monitor fuse
is replaced, the monitor switch must also be replaced. Use part FFS-BA016/KIT 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.
14
N
M
L
L
L
L
K
J
I
H
G
F
E
D
D
C
B
A
FOIL PATTERN ON P.W.B.
COMPU DEFROST
RELAY (RY-4)
RELAY (RY-3)
RELAY (RY-2)
RELAY (RY-1)
KEY UNIT
CONTROL UNIT
HOOD FAN MOTOR
HOOD THERMAL CUT-OUT
MONITOR FUSE
MONITOR SWITCH
STOP SWITCH
PRIMARY INTERLOCK SWITCH
SECONDARY INTERLOCK SWITCH
TEMPERATURE FUSE OR THERMAL CUT-OUT
POSSIBLE CASE AND
DEFECTIVE PARTS
15
SENSOR
COOKING
CONDITION
HOOD MOTOR CAPACITOR
HOOD LAMP OR SOCKET
TURNTABLE OFF CONDITION
STIRRER MOTOR
TURNTABLE MOTOR
FAN MOTOR
OVEN LAMP OR SOCKET
AH SENSOR
MICROWAVE
COOKING
CONDITION
CK
RE
CK
RE
RE
RE
RE
O
IDLE
CONDITION
LOW VOLTAGE
NO POWER AT OUTLET
SHORTED IN POWER CORD
OPENED OR SHORTED WIRING
Home fuse blows when power cord is plugged into wall receptacle.
Monitor fuse blows when power cord is plugged into wall receptacle.
Display does not illuminate when power cord is first plugged into wall receptacle.
Display does not operate properly when STOP/CLEAR key is touched. (The
time of day should appear on the display with beep sound during normal
condition.)
Oven lamp does not light with door is opened.
Hood fan motor operates when power cord is first plugged into wall receptacle.
Temperature of oven base seems more than 140˚F (60˚C) because of operation
of the range below. But hood fan motor does not turn on automatically.
(Normally, food fan motor should be operating at low speed.)
Hood lights do not turn on when Light Options pad is pressed.
Hood fan motor does not rotate at all with touched Fan Options pad.
Speed of the hood fan motor does not change when the Fan Options pad is
touched for this function.
Oven lamp does not light in cook cycle. (But it does light when door is opened.)
Fan motor does not operate. (Oven lamp and turntable motor operate.)
Turntable motor does not operate (Oven lamp lights and fan motor operates.)
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.)
Oven goes into a cook cycle but extremely uneven heating is produced in
oven load (food).
Variable cooking does not operate properly except Cooking Power 100% mode.
Function of COMPU DEFROST does not operate properly.
Stirrer motor does not operate. (Other parts operate.)
Oven goes into COMPU DEFROST but food is not defrosted well.
The oven Stops and "ERROR" is displayed or 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 32 seconds after starting.
PROBLEM
CK
CK
RE
CK
OFF
CONDITION
CONDITION
TEST PROCEDURE
R-1750
R-1751
R-1752
R-1754
CK = Check / RE = Replace
INVERTER UNIT
MAGNETRON
R-1750
R-1751
R-1752
R-1754
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.
To discharge high voltage capacitor, wait for 60 seconds.
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 10(HIGH) selecting more than 60
seconds cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second hand
of a watch or the digital read-out countdown.
3. Remove the cup from the oven and again measure the temperature, making sure to stir the
thermometer or thermocouple through the water until the maximum temperature is recorded.
4. Subtract the cold water temperature from the hot water temperature. The normal result should be 29.9
to 55.4˚F(16.6 to 30.8˚C) rise in temperature. If the water temperatures are accurately measured and
tested for the required time period the test results will indicate if the magnetron tube has low power
output (low rise in water temperature) which would extend cooking time or high power output (high
rise in water temperature) which would reduce cooking time. Because cooking time can be adjusted
to compensate for power output, the magnetron tube assembly should be replaced only if the water
temperature rise test indicates a power output well beyond the normal limits. The test is only accurate
if the power supply line voltage is 120 volts and the oven cavity is clean.
B
INVERTER UNIT TEST
WARNING: DO NOT TOUCH THE COMPONENTS OF THE INVERTER UNIT WHILE INVERTER
UNIT IS ENERGIZED. IT IS DANGEROUS BECAUSE THIS HAS HIGH VOLTAGE
COMPONENTS.
1.
2.
3.
4.
5.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
To discharge high voltage capacitor, wait for 60 seconds.
Isolate the inverter unit electrically.
Check the inverter unit by referring the following chart and test procedure.
16
R-1750
R-1751
R-1752
R-1754
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
Chart for checking the defective inverter unit
Varistor VRS2 is defective.
Exchange the defective parts.
When a foil pattern at "e" is broken, insert a jumper
Varistor VRS2 or/and foil pattern open YES wire at "J2" and solder.
on the inverter unit .
When a foil pattern at "e" and "f" are broken, insert
a coil RCILF2003YAZZ between "g" and "h". (See
NO
Figure B-1.)
High Voltage diode D11 and D12 are YES
Exchange the D11 and D12.
defective.
No power at full power output cooking
NO
YES
Exchange the magnetron.
Magnetron is defective.
YES
H. V. transformer is defective.
Exchange the H. V. transformer
NO
Exchange the Inverter unit
BLUE
L2
D1
f
VRS2
(J2)
e
h
D32
RED
NOTE: "e", "f," "g", "h" and "(J2)"
are not indicated on
P.W.B.
g
M
Figure B-1 Foil pattern circuit on Inverter Unit
Brown monitor fuse
NO
The secondary interlock switch, primary interlock
switch and the monitor switch are operating properly.
Check the switches according to
the switch Test Procedure
YES
power transistor Q1 is defective.
YES
Exchange the power transistor Q1.
NO
Bridge diode D1 is defective.
YES
Exchange the bridge diode D1.
NO
Varistor VRS3 is defective.
YES
Exchange the varistor VRS3.
NO
H. V. transformer is defective.
YES
NO
Exchange the Inverter unit
17
Exchange the H. V. transformer.
R-1750
R-1751
R-1752
R-1754
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
Description of main parts
SYMBOL
C11, C12
PART NAME
High voltage capacitor
FUNCTION
High voltage capacitor for doubler circuit.
C2
Film capacitor
To smooth line ripple
C3
CT1
Film capacitor
Current transformer
Capacitor for resonant
To detect power current
D1
Bridge Diode
To rectify full-wave of power supply
D11, D12
IC1
High voltage diode
Integrated Circuit (IC)
Full wave voltage doubler
Inverter circuit controller
L2
Choke Coil
To smooth line ripple
Q1
Q2, Q3
Transistor
Transistor
Power transistor for switching
To drive transistor Q1 ON-OFF
T1
High voltage transformer assembly
High voltage transform for high frequency
Test procedure
OK
NG
∞
0
(G, E)
+
Q1
x 1Ω
(C)
G C E
Figure B-2. Check for Power Transistor Q1
OK: Normal
NG: Defect
20
OK
NG
∞
0
D12
D11
Anode
White
color
+
x 1Ω
Yelow
color
UX-F0BL
2. High voltage diode D11 and D12
Check these diodes by using ohmmeter as shown in Figure B-2.
If one of the diode is shorted, exchange both diodes D11 and D12.
NOTE: When a digital ohmmeter is
used, reverse the connection
of ohmmeter leads against
Figure B-3.
OK: Normal
NG: Defect
20
UX-F0B
1. Power transistor Q1
Check the transistor Q1 by using ohmmeter as shown in Figure B-2
If transistor Q1 is defective exchange
Q1.
Check the bridge diode D1, transistor
Q2 and transistor Q3 by using ohmmeter and replace them if they are
defective.
NOTE: When a digital ohmmeter is
used, reverse the connection
of ohmmeter leads against
Figure B-2.
Cathode
Figure B-3. Check for high voltage diode D11 & D12
3. Bridge diode D1
Check the diode D1 by using ohmmeter as shown in Figure B-4.
If the diode D1 is defective, exchange
D1 and power transistor Q1 at same
time (Q1 is defective)
NOTE: When a digital ohmmeter is
used, reverse the connection
of ohmmeter leads against
Figure B-4.
OK: Normal
NG: Defect
20
OK
NG
∞
0
-
+
x 1Ω
D1
and
+
+
-
Figure B-4. Check for bridge diode D1.
18
R-1750
R-1751
R-1752
R-1754
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
4. Transistor Q2 and Q3
Check the resistance of transistor Q2 and
Q3 by using ohmmeter as shown in Figure B-5.
The resistance between B and E of transistor Q2 and Q3 is approx. 20Ω
The resistance between C and E is over
range.
If incorrect resistance appear, replace it.
NOTE: When a digital ohmmeter is used,
reverse the connection of ohmmeter leads against Figure B-5.
Q2
20
Q3
OK: Normal
NG: Defect
OK
NG
∞
0
ECB
ECB
(B, E)
(C)
+
x 1Ω
and
(B, E)
Q2
(C)
Q3
Figure B-5. Check for transistor Q2 and Q3.
After check of inverter unit;
CAUTION: DO NOT OPERATE INVERTER UNIT BY ITSELF.
1. Install the inverter unit to the microwave oven securely.
2. Reconnect all leads removed from components during testing.
3. Reinstall the outer case (cabinet).
4. Reconnect the power supply cord after the outer case is installed.
CAUTION: DO NOT CONNECT THE OVEN TO WALL OUTLET WITHOUT THE OUTER
CASE INSTALLED.
5. Measure the microwave output power at full power cooking operation (refer to Test Procedure of
Magnetron Test in the Service manual) or measure the input current at full power and 50% power
level. Input current is approx. 8A at 50% power level operation and approx. 15A at full power
operation.
C
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.
To discharge high voltage capacitor, wait for 60 seconds.
A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the
temperature of the thermal cut-out reaches approximately 293˚F(145˚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 TEMPERATURE FUSE TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
To discharge high voltage capacitor, wait for 60 seconds.
A continuity check across the temperature fuse terminals should indicate a closed circuit. If the
temperature of the magnetron reaches approximately 302˚F(150˚C), the temperature fuse opens. An
open temperature fuse 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 OR TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT
AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT OR TEMPERATURE FUSE.
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TEST PROCEDURES
PROCEDURE
LETTER
D
COMPONENT TEST
PRIMARY INTERLOCK SWITCH AND SECONDARY INTERLOCK SWITCH 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.
To discharge high voltage capacitor, wait for 60 seconds.
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 primary interlock switch or 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.
STOP SWITCH TEST
STOP SWITCH
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
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 stop 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 stop switch contacts fail in the open position and the door is closed, the cooling fan motor,
stirrer motor and oven light will be activated by RY1.
F
MONITOR SWITCH TEST
1.
2.
3.
4.
5.
6.
7.
8.
G
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
To discharge high voltage capacitor, wait for 60 seconds.
Before performing this test, make sure that the secondary interlock switch and the primary interlock
switch are operating properly, according to the above Switch Test Procedure. Disconnect the wire
lead from the monitor switch (COM) terminal. Check the monitor switch operation by using the
ohmmeter as follows. When the door is open, the meter should indicate a closed circuit. When the
monitor switch 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
Black
the monitor circuit.
White /White
Reconnect all leads removed from
components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord Screw Driver
Secondary
Monitor
after the outer case is installed.
Interlock
Switch
Ohmmeter
Run the oven and check all functions.
Switch
BLOWN MONITOR FUSE TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
3. To discharge high voltage capacitor, wait for 60 seconds.
4. If the monitor fuse is blown when the door is opened, check the primary interlock switch, 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
SWITCH, SECONDARY INTERLOCK 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-BA016/KIT, 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. 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.
H
HOOD THERMAL CUT-OUT TEST
1.
2.
3.
4.
5.
6.
7.
8.
I
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
To discharge high voltage capacitor, wait for 60 seconds.
A continuity check across the thermal cut-out terminals should indicate an open circuit unless the
temperature of the thermal cut-out reaches approximately 140˚F(60˚C) or more. At that temperature,
the contacts will close. The thermal cut-out opens automatically at approximately 113˚F(45˚C).
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.
HOOD FAN MOTOR 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.
To discharge high voltage capacitor, wait for 60 seconds.
If the motor does not turn, touch the Fan Options pad once (set hood fan motor power "HIGH") and
check voltage between pins "1" and "2" (Blue and Black wires) of the 6 pin connector. If 120 Volts
appear and the hood capacitor is good, replace the hood fan assembly. If 120 Volts does not appear,
check the motor circuit. The resistance values of motor terminals are as follows:
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.
Resistance between;
YLW
BLU
4
HOOD FAN
CAPACITOR
1
32 Ω
5
45 Ω
20 Ω
BLU (1)
BLK (2)
BLU (1)
BLK (2)
WHT (3)
AND
AND
AND
AND
AND
YLW (4) =
YLW (4) =
BLK (2) =
WHT (3) =
RED (5) =
BLU BLK WHT
1
2
3
2
BLK
RED
3
WHT
21
0Ω (Shorted)
32Ω
32Ω
20Ω
45Ω
6-PIN CONNECTOR
OF HOOD FAN MOTOR
4
5
YLW RED
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TEST PROCEDURES
PROCEDURE
LETTER
J
COMPONENT TEST
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, LSI 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) To discharge high voltage capacitor, wait for 60 seconds.
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.
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) To discharge high voltage capacitor, wait for 60 seconds.
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 K) 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 LSI 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,
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
1)
2)
3)
4)
5)
6)
7)
K
KEY UNIT TEST
1.
2.
3.
4.
5.
6.
7.
8.
L
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
To discharge high voltage capacitor, wait for 60 seconds.
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.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
To discharge high voltage capacitor, wait for 60 seconds.
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 stop switch operates properly; that is the contacts are closed
when the door is closed and open when the door is open. If the stop switch is good, disconnect the
flat ribbon cable that connects the key unit to the control unit and make sure the stop switch is closed
(either close the door or short the stop 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 STOP/
CLEAR pad making momentary contact. If the control unit responds by clearing with a beep the key
unit is faulty and must be replaced. If the control unit does not
G1
G2
G3
G14
respond, it is faulty and must be replaced. If a specific pad
More from
Fish/
Fan
Baked
Your
does not respond, the above method may be used (after G 5
Potatoes Seafood Options Microwave
6x6
clearing the control unit) to determine if the control unit or key
Frozen Defrost
G
6
Popcorn
Vegetables
pad is at fault.
Food
3+6
Reconnect all leads removed from components during testing.
Beverage
G13
Reheat Meats Set Up Center
Re-install the outer case (cabinet).
Reconnect the power supply cord after the outer case is G12
STOP/ START Turntable Keep
CLEAR
Warm
On/Off
installed.
Light
Pasta
MINUTE
Run the oven and check all functions.
Poultry
G11
PLUS
Options
Grains
RELAY TEST
1.
2.
3.
4.
5.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
To discharge high voltage capacitor. wait for 60 seconds.
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. 5 of the 4 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, RY2, RY3 and RY4 Relays Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated ..................... Defective relay.
DC. voltage not indicated ............... Check diode which is connected to the relay coil. If diode
is good, control unit is defective.
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
RY2
RY3
Approx. 25.6V D.C.
Approx. 25.6V D.C.
Approx. 25.6V D.C.
Oven lamp / Stirrer motor / Cooling fan motor
Turntable motor
Hood motor
RY4
Approx. 25.6V D.C.
Hood motor (HIGH/LOW selection)
8. Disconnect power supply cord, and then remove outer case.
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LETTER
COMPONENT TEST
9. Open the door and block it open.
10.To discharge high voltage capacitor, wait for 60 seconds.
11.Reconnect all leads removed from components during testing.
12.Re-install the outer case (cabinet).
13.Reconnect the power supply cord after the outer case is installed.
14.Run the oven and check all functions.
M
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
WEIGHT
0.5lb
1ST STAGE
LEVEL
TIME
70%
30sec.
2ND STAGE
LEVEL
TIME
40%
25sec.
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
N
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) To discharge high voltage capacitor, wait for 60 seconds.
4) Follow the troubleshooting guide given below for repair.
STEPS
1
2
OCCURRENCE
CAUSE OR CORRECTION
Only pattern at "a" is broken.
Pattern at "a" and "b" are broken.
AC
RY2
c
(J1)
b
a
P
T1
TTM
VRS1
d
RY1
1
7
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 138Ω ± 10%). If any
abnormal condition is detected, replace
the defective parts.
*Insert jumper wire J1 and solder.
*Insert the coil RCILF2003YAZZ between "c" and "d".
6) Reconnect all leads removed from components during testing.
7) Re-install the outer case (cabinet).
8) Reconnect the power supply cord after the outer case is installed.
9) Run the oven and check all functions.
2. Follow the troubleshooting guide given below, if indicator does not light up after above check and
repairs are finished.
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) To discharge high voltage capacitor, wait for 60 seconds.
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.
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
6) After that procedure, re-connect the power supply cord.
7) Follow the troubleshooting guide given below for repair.
STEPS
8)
9)
10)
11)
12)
13)
14)
O
OCCURRENCE
CAUSE OR CORRECTION
1
The rated AC voltage is not present between
Pin No. 5 of the 4-pin connector (A) and the
common terminal of the relay RY1.
Check supply voltage and oven power cord.
2
The rated AC voltage is present at primary
side of low voltage transformer.
Low voltage transformer or secondary circuit defective.
Check and repair.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
To discharge high voltage capacitor, wait for 60 seconds.
Reconnect all leads removed from components during testing.
Re-install the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
AH SENSOR TEST
Checking the initial sensor cooking condition
WARNING : The oven should be fully assembled before following procedure.
(1) The oven should be plugged in at least two minutes before sensor cooking.
(2) Room temperature should not exceed 95˚F (35˚C).
(3) The unit should not be installed in any area where heat and steam are generated. The unit should
not be installed, for example, next to a conventional surface unit. Refer to the “INSTALLATION
INSTRUCTIONS” of the operation manual.
(4) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To
permit adequate ventilation, be sure to install so as not to block these vents. There should be some
space for air circulation.
(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any
moisture with a dry cloth or paper towel.
(6) The Sensor works with food at normal storage temperature. For example, chicken pieces would be
at refrigerator temperature and canned soup at room temperature.
(7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The
sensor will detect the vapor given of by the spray and turn off before food is properly cooked.
(8) If the sensor has not detected the vapor of the food, ERROR will appear and the oven will shut off.
Water load cooking test
WARNING : The oven should be fully assembled before following procedure.
Make sure the oven has been plugged in at least two minutes before checking sensor cook operation.
The cabinet should be installed and screws tightened.
(1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
(2) Place the container on the center of tray in the oven cavity.
(3) Close the door.
(4) Touch Reheat pad. Then select "Regular Turntable On". And touch START pad. Now, the oven is
in the sensor cooking condition and "SENSING" will appear.
(5) The oven will operate for the first 32 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) To discharge high voltage capacitor, wait for 60 seconds.
25
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
(4)
(5)
(6)
(7)
(8)
(9)
Remove the AH sensor.
Install the new AH sensor.
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.
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. Then select "Regular Turntable On". And touch START pad.
9-5. The control panel is in automatic Sensor operation.
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 dose not operate properly, the problem is with the control unit, and refer to explanation
below.
CHECKING CONTROL UNIT
(1)
(2)
(3)
(4)
(5)
(6)
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
To discharge high voltage capacitor, wait for 60 seconds.
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 connector of the main wire harness from the inverter wire assembly connected to the
inverter unit.
(7) Ensure that the connector 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. Then select "Regular Turntable On". And touch START pad.
9-2. The control panel is in the sensor cooking operation.
9-3. After approximately 70 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) To discharge high voltage capacitor, wait for 60 seconds.
(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.
Plunger
F-1
F-2
To connector (F)
on Control Unit.
1
2
3
R1,R2 : 82Ω ± 1% 1/2W
R3 : 10kΩ ± 5% 1/4W
R4 : 1MΩ ± 5% 1/4W
NC
NO
COM
COM NO
R1
F-3
R2
CONNECTOR
R3
R4
Sensor Dummy Resistor Circuit
26
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TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
In addition, the synchronizing signal is available in order
to compose a basic standard time in the clock circuit.
The touch control section consists of the following units.
(1) Key Unit
(2) Control Unit (The Control Unit consists of Power Unit
and LSI Unit).
The principal functions of these units and the signals communicated among them are explained below.
Symbol
VC
Voltage
+5V
Application
LSI(IC1)
9) Relay Circuit
A circuit to drive the fan motor, stirrer motor, turntable
motor, hood motor and light the oven lamp.
Key Unit
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through 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 and PB5 to perform the function that was requested.
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.
Control Unit
Control unit consists of LSI, IC, ACL circuit, inverter unit
control 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.
12) Stop Switch
A switch to “tell” the LSI if the door is open or closed.
1) IC1 (LSI)
This is a microcomputer, responsible for controlling the
entire control unit.
13) Back Light Circuit
A circuit to drive the back light (Light emitting diodes
LED1 and LED2).
2) IC2
This is a read only memory IC, responsible for giving IC1
the all programmes.
14) Absolute Humidity Sensor Circuit
This circuit detects moisture of the cooking food to allow
its automatic cooking.
3) IC3
This is an amplifier IC. This IC controls the contrast of
LCD and amplify the sensor signal.
4) IC4
This is a memory IC. This memorizes the contrast of
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.
5) IC5
This IC drives the LCD.
16) Inverter Unit Control Circuit
This is the circuit to control the inverter unit.
6) ACL
This circuit generates a signal which resets the LSI (IC1)
to the initial state when power is supplied.
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.
8) Power Source Circuit
This circuit generates voltages necessary in the control
unit from the AC line voltage.
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DESCRIPTION OF LSI
LSI(IZA958DR)
The I/O signal of the LSI(IZA958DR) is detailed in the following table.
Pin No.
1
Signal
TIOCA2
I/O
OUT
Description
Power level data output signal for inverter unit.
The power level will be decided by the time ratio
of T1 and T2.
16.7 msec.
H : +5V
L : GND
T1
2
3
A20
Vcc
OUT
IN
4
TMO0
OUT
5
PB1
IN
6
PB2
IN
7
PB3
IN
8
PB4
IN
9
PB5
IN
10
11
PB6
PB7
OUT
OUT
12
13
RESO
Vss
OUT
IN
14
15
16
TxD0
P91
RxD0
OUT
OUT
OUT
T2
Terminal not used.
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).
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.
Signal similar to PB1.
When either G12 line on key matrix is touched, a corresponding signal will be input into PB2.
Signal similar to PB1.
When either G13 line on key matrix is touched, a corresponding signal will be input into PB3.
Signal similar to PB1.
When either G6 line on key matrix is touched, a corresponding signal will be input into PB4.
Signal similar to PB1.
When either G5 line on key matrix is touched, a corresponding signal will be input into PB5.
Terminal not used. Connected to test point.
Turntable motor driving signal.
H : +5V
To turn on and off relay(RY2). "H" level: During
ON
Turntable On. "L" level: During Turntable OFF or
L : GND
OFF
during the oven is off condition.
Terminal not used.
Power source voltage: GND(0V).
The power source voltage to drive LSI is input to Vss terminal.
Data signal is output to a memory IC (IC4).
Clock signal is output to a memory IC (IC4).
Oven lamp, fan motor and stirrer motor driving signal
16.7 msec.
To turn on and off shut off relay (RY1). The
H : +5V
square waveform voltage is delivered to the
RY1 driving circuit.
L : GND
During cooking
17
P93
OUT
18
P94
OUT
19
P95
OUT
20
P40
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.
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.
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.
Key strobe signal.
Signal applied to key unit section. A pulse signal is input to PB1-PB5 terminal while one
of G14 line keys on key matrix is touched.
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Pin No.
Signal
I/O
21
P41
OUT
22
P42
OUT
23
P43
OUT
24
Vss
IN
25
P44
OUT
26
P45
OUT
Description
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.
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.
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.
Power source voltage : GND(0V).
The power source voltage to drive LSI is input to VSS terminal.
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.
Hood lamp driving signal.
AC
CURRENT
To turn on and off solid state relay (SSR1). " 1 "
H
level : During Hood lamp ON (WORK LIGHT
WORK
1
LIGHT
L
level). " 2 " level: During Hood lamp ON (NIGHT
H
NIGHT
LIGHT level) . "H" level: During Hood lamp ON. 2
LIGHT
L
27
P46
OUT
28
P47
OUT
29-36
37
D8-D15
Vcc
OUT
IN
38-45
46
A0-A7
Vss
OUT
IN
47-58
59
A8-A19
Vss
OUT
IN
60
61
WATT
P61
IN
OUT
62
63
64
65
P62
P67
STBY
RES
OUT
OUT
IN
IN
66
67
NMI
Vss
IN
IN
68
EXTAL
OUT
Hood motor driving signal.
H : +5V
To turn on and off relay (RY3). "H" level : During
ON
Hood motor ON. "L" level: During Hood lmotor
L : GND
OFF
OFF.
Hood motor high / low driving signal.
H : +5V
To turn on and off relay (RY4). "H" level : During
ON
Hood motor high. "L" level: During Hood lmotor
L : GND
OFF
low.
Data signal is output to IC2 and 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.
Power source voltage : GND (0V).
The power source voltage to drive LSI is input to Vss terminal.
Connected to VCC.
Envelope signal to sound buzzer.
A: key touch sound (short beep). B: Completion sound (melody or long beep).
Reset signal is output to IC5.
Terminal not used.
Connected to VCC.
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.
Connected to GND.
Power source voltage : GND (0V).
The power source voltage to drive LSI is input to Vss terminal.
Internal clock oscillation output.
Output to control oscillation input to EXTAL.
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Pin No.
Signal
I/O
69
XTAL
IN
70
Vcc
IN
AS
RD
HWR
LWR
MD0-MD1
MD2
Avcc
OUT
OUT
OUT
OUT
IN
IN
IN
79
Vref
IN
80
81
AN0
AN1
IN
IN
82
AN2
IN
83
AN3
IN
84
AN4
IN
85
AN5
IN
86
87
88
DA0
DA1
Avss
OUT
OUT
IN
89
IRQ0
IN
71
72
73
74
75-76
77
78
Description
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.
Terminal not used.
Read strobe signal is output to RD terminal of IC5.
Write strobe signal is output to WR terminal of IC5.
Terminal not used.
Connected to VCC.
Connected to GND.
A/D converter power source voltage : +5V.
The power source voltage to drive the A/D converter. Connected to VCC.
A/D converter power source voltage : +5V.
The power source voltage to drive the A/D converter. Connected to VCC.
When a magnetron generates abnormally the detecting signal is input to AN0 terminal.
To input signal which communicates the door open/close information to LSI.
Door close "L" level signal (GND). Door open "H" level signal (+5V).
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.
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.
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.
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.
Terminal not used.
The signal for the power source to drive the LCD is output to IC3.
A/D converter power source voltage : GND(0V).
The power source voltage to drive the A/D converter. Connected to GND.
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of
H : +5V
LSI.
L : GND
16.7 msec.
90-91
92
93
94
P81-P82
CS1
CS0
Vss
OUT
OUT
OUT
IN
95-99
100
PA0-PA4
PA5
OUT
OUT
Terminal not used.
Chip select signal is output to CS terminal of IC5.
Chip select signal is output to CE terminal of IC2.
Power source voltage : GND (0V).
The power source voltage to drive the LSI is input to Vss terminal.
Used for initial balancing of the bridge circuit (absolute humidity sensor).
Clock signal is output to IC5.
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ABSOLUTE HUMIDITY SENSOR CIRCUIT
resistance balance of the bridge circuit is deviated to
increase the voltage available at AN4 terminal of the LSI.
Then the LSI observes that voltage at AN4 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 AN4
terminal 32 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.
(1) Structure of Absolute Humidity Sensor
The absolute humidity sensor includes two thermistors
as shown in the illustration. One thermistor is housed in
the closed vessel filled with dry air while another in the
open vessel. Each sensor is provided with the protective
cover made of metal mesh to be protected from the
external airflow.
Thermistors
Sensing part
(Closed vessel)
1) Absolute humidity sensor circuit
(2) Operational Principle of Absolute Humidity Sensor
The figure below shows the basic structure of an absolute
humidity sensor. A bridge circuit is formed by two
thermistors and two resistors (R1 and R2).
The output of the bridge circuit is to be amplified by the
operational amplifier.
Each thermistor is supplied with a current to keep it
heated at about 150˚C (302˚F), the resultant heat is
dissipated in the air and if the two thermistors are placed
in different humidity conditions they show different
degrees of heat conductivity leading to a potential
difference between them causing an output voltage from
the bridge circuit, the intensity of which is increased as
the absolute humidity of the air increases. Since the
output is very minute, it is amplified by the operational
amplifier.
R3
R1
C
R2
S : Thermistor
open vessel
C : Thermistor
closed vessel
R40 330
K
C. Thermistor in
closed vessel
S. Thermistor in
open vessel
13
.57
23
F1
3
C40 0.1µF
K
R4
S
F3
VC : +5V
D40
.32
F2
2
8
+
IC3
4
84
1
R45 10K
AN4
R46 47K
LSI
(IC1)
C41 0.015µF
C42 0.01µF
R43 1.8K
R47 47K
R48 620K
R49 300K
Absolute humidity vs,
output voltage characteristic
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, 32 seconds clearing cycle occurs
than the detector circuit starts to function and the LSI
observes the initial voltage available at its AN4 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 AN4
terminal will indicate about +2.5V. This initial balancing
is set up about 32 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
31
R44 360K
C43 0.01µF
85
95
96
R50 150K
97
R51 75K
98
R52 37.4K
Output voltage
S
Operational
amplifier
Output
voltage
+
VA : +15V
R4
Sensing part
(Open vessel)
C
ventilation opening for sensing
99
AN5
SW1
PA0
SW2
PA1
SW3
PA2
SW4
PA3
SW5
PA4
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SERVICING
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the
circuits. When handling these parts, the following
precautions should be strictly followed. CMOS LSI have
extremely high impedance at its input and output
terminals. For this reason, it is easily influenced by the
surrounding high voltage power source, static electricity
charge in clothes, etc. and sometimes it is not fully
protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap them in
aluminium foil. Also wrap all PW boards containing them
in aluminium foil.
2) When soldering, ground the technician as shown in the
figure and use grounded soldering iron and work table.
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
stop 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 stop 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 sensorrelated controls of the touch control panel by using the
dummy resistor(s).
approx. 1M ohm
2. Shapes of Electronic Components
Transistor
2SD1859
E
C
B
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: DC-10MHz
type or more advanced model.
3) Others: Hand tools
5. Other Precautions
1) Before turning on the power source of the control unit,
remove the aluminium foil applied for preventing static
electricity.
2) Connect the connectors of the key unit to the control unit
being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that abnormal
voltage due to static electricity etc. is not applied to the
input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to PWB,
making sure that all connections are tight.
5) Be sure to use specified components where high precision
is required.
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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)
Inverter unit that includes High Voltage Capacitor, Power Transformer, High Voltage Rectifier and Heat sink etc., and
Magnetron, 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) To discharge high voltage capacitor, wait for 60
seconds.
2. Don’t let the wire leads touch to the followiong parts;
1) High voltage parts:
Magnetron, Inverter unit.
2) Hot parts:
Oven lamp, Magnetron, Inverter unit 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, Stirrer motor, Stirrer
fan.
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 PANAL PARTS, DOOR PARTS’, when carrying out any of
the following removal procedures:
THE FOLLOWING ADJUSTMENTS OR COMPONENT REPLACEMENT CAN BE PERFORMED
WITHOUT REMOVING THE OVEN FROM THE WALL
1. Hood lamps, sockets and grease filter.
2. Oven lamp, base cover and hood lamp glass assembly.
3. Turntable motor.
4. Hood exhaust louver.
5. Control panel assembly or components
6. Stirrer cover and stirrer fan.
HOOD EXHAUST LOUVER REMOVAL
5. Now, the hood exhaust louver is free.
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. Remove the one (1) screw holding the hood exhaust
louver to the oven cavity with the outer case cabinet.
4. Pull the hood exhaust louver from the oven cavity by
pushing the right and left tabs of the hood exhaust louver
to remove.
Push
Push
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REMOVAL OF OVEN FROM WALL (It is recommended that two people remove the oven)
1. Disconnect the power supply cord, and uncoil the power
supply cord.
2. Remove the turntable tray and support from the oven cavity.
3. Remove the one (1) screw holding the exhaust damper
assembly to the rear stay, and remove the exhaust
damper assembly by sliding it backward.
4. Remove the two (2) screws holding the oven (outer case
cabinet) to the top cabinet.
5. Remove the hood exhaust louver referring to "HOOD
EXHAUST LOUVER REMOVAL".
6. While supporting the front of the oven, unfasten the two
(2) unit mounting screws holding the oven to the unit
mounting plate.
7. Remove the oven by sliding it into the arms of the unit
mounting plate and pull the power cord out of the wall
cabinet.
8. The oven is now free and can be placed on the work
surface selected for servicing the oven.
9. Installation is the reverse of this procedure.
OUTER CASE REMOVAL
free it from retaining clips on the cavity face plate.
7. Disconnect the three (3) pin connector of the power
supply cord from the wiring harness and remove the
power supply cord together with the outer case.
8. Discharge high voltage capacitor.
CAUTION: 1. DISCONNECT OVEN FROM POWER
SUPPLY BEFORE REMOVING OUTER
CASE.
2. DISCHARGE THE HIGH VOLTAGE
CAPACITOR BEFORE TOUCHING ANY
OVEN COMPONENTS OR WIRING.
Remove the oven from the wall and proceed as follows;
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. Remove one (1) screw holding the hood exhaust louver
to the oven, and pull it forward to remove by pushing the
right and left tabs of the hood exhaust louver. (Refer to
procedure of "HOOD EXHAUST LOUVER REMOVAL".)
4. Remove four (4) screws holding the rear stay to the hood
fan motor or the oven, and remove it.
5. Remove the four (4) screws from the rear of the outer
case cabinet.
6. Slide the outer case cabinet back about 1 inch (3 cm) to
INVERTER UNIT REMOVAL
3. Install by sliding the inverter angle on the right base
plate.
4. Secure the inverter angle with two (2) screws to right
base plate.
5. Reinstall the base cover to the oven cavity with the three
(3) screws.
6. Re-connect high voltage wire assembly to the magnetron.
Refer to "PICTORIAL DIAGRAM".
7. Re-install the hood duct holding the fan motor to the oven
cavity front flange with one (1) screw.
8. Re-connect the wire leads to the chassis support and the
fan motor, referring to "PICTORIAL DIAGRAM".
9. Re-install the outer case and check that oven is operating
properly.
CAUTION: MAKE SURE THE WIRE LEADS NEVER
TOUCH THE FAN BLADE.
1. Disconnect the power supply cord, remove the oven
from wall, and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer Case Removal".)
And proceed as follows.
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Remove the three (3) screws holding the base cover to
the oven cavity.
5. Open the base cover from the oven cavity by pulling
down.
6. Remove the two (2) screws holding the inverter angle to
the right base plate.
7. Remove one (1) screw holding the hood duct to the oven
cavity front flange.
8. Disconnect the stop switch harness from the chassis
support and disconnect the wire leads from the fan motor.
9. Lift up the fan motor side of the hood duct.
10.Disconnect the high voltage wire from the magnetron.
11.Release the inverter angle from the right base plate.
12.Disconnect high voltage wire assembly and the inverter
wire assembly from the inverter unit.
13.Remove the three (3) screws holding the inverter unit to
the inverter angle.
14.Remove the inverter unit from the inverter angle.
Bar of high voltage
transformer
High voltage wire
assembly
Inverter wire
assembly
M
Reinstallation
1. Reinstall the inverter unit to the inverter angle with the
three (3) screws.
2. Reconnect high voltage wire assembly and the inverter
wire assembly to the inverter unit. Refer to "PICTORIAL
DIAGRAM".
Blu
Red
AC3
-A
PWM wire
assembly
34
Inverter unit
N
C
Screw for Earth
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NOTE: The high voltage wire assembly should be routed
under the bar of thr high voltage transformer.
inverter unit board.
3. Remove the one (1) screw holding transistor Q1to the
heat sink.
4. Now, transistor Q1 is free
NOTE: Apply silicone grease (Toshiba YG6260 or Shinetsu
G-746) to the back side of transistor Q1, before
trnasistor Q1 is installed to the heat sink.
[HOW TO REMOVE TRANSISTOR Q1]
1. After the inverter unit is removed. take off the solder on
legs of transistor Q1, bridge diode D1 and PTC thermistor
PH1.
2. Remove the two (2) screws holding the heat sink to the
HOOD FAN MOTOR, HOOD DUCT AND OVEN LAMP SOCKET REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Disconnect the 6-pin connector of the hood fan motor
from the main wire harness located at the right edge of
the hood duct and release the snap band from the hood
duct.
5. Remove the hood fan motor from the hood duct by lifting
it up.
6. Now, the hood fan motor is free.
7. Remove one (1) screw holding the hood duct to the oven
cavity front plate.
8. Release the 6-pin connector and the 3-pin connector of
the main harness A from the hood duct.
9. Disconnect the wire leads from the fan motor and chassis
support, and release the wire leads from holes of the
hood duct.
10.Remove the two (2) unit mounting screws from the
chassis support (right side) and the hood duct (left side).
11.Remove the one (1) screw holding the chassis support.
12.Remove the chassis support.
13.Remove the hood duct from the oven cavity by lifting it up
14.Screw the oven lamp off from the lamp socket.
15.Remove the lamp socket from the lamp angle.
16.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.
17.Now, the oven lamp socket and the hood duct are free.
Oven lamp
socket
Terminal
Wire lead
Terminal hole
Flat type small
screw driver
MAGNETRON REMOVAL
7. Remove the inverter unit from the right base plate,
referring to "INVERTER UNIT REMOVAL".
8. Carefully remove four (4) mounting screws holding the
magnetron to waveguide. When removing the screws
hold the magnetron to prevent it from falling.
9. Remove the magnetron from the unit with care so the
magnetron tube should not be hit by any metal object
around the tube.
10.Remove the one (1) screw holding the magnetron air
guide to the magnetron.
11.Remove the magnetron air guide
CAUTION: WHEN REPLACING THE MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND
MOUNTING SCREWS ARE TIGHTENED SECURELY.
1. Disconnect the power supply cord , remove the oven
from wall and remove outer case (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal".)
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Disconnect the wire leads from the fan motor and the
chassis support, and release them from the holes of
hood duct.
5. Remove the one (1) screw holding the hood duct to the
oven cavity front plate, and lift up the fan motor side of the
hood duct.
6. Disconnect the high voltage wire assembly from the
magnetron.
THERMAL CUT-OUT (OVEN) REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Remove two (2) unit mounting screws.
5. Remove the hood duct. (Refer to the procedure of "
HOOD FAN MOTOR, HOOD DUCT AND OVEN LAMP
SOCKET REMOVAL".
6. Straighten the tab holding the thermal cut-out to the top
plate of the oven cavity.
7 . Release the thermal cut-out (oven) from the one slit of
the oven cavity top plate.
35
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Top of Oven Cavity
8. Disconnect the wire leads from the thermal cut-out
(oven).
9. Now, the thermal cut-out (oven) is free.
NOTE: When the tab is broken or turned off, use the another
tab which is fixed near the slit when the new thermal
cut-out is replaced.
Tab
Thermal
Cut-Out
Waveguide
Slit
Thermal
Cut-Out
Thermal
Cut-Out
(Oven)
Tab
HOOD FAN THERMAL CUT-OUT REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Disconnect the wire leads from the hood fan thermal
cut-out.
5. Remove one (1) screw holding the thermal cut-out to the
right base plate.
6. Remove the hood fan thermal cut-out from the right base
plate.
7. Now, the hood fan thermal cut-out is free.
TEMPERATURE FUSE (MAGNETRON) REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Remove the hood fan motor and the hood duct from the
oven cavity, referring to the procedure of " HOOD FAN
MOTOR, HOOD DUCT AND OVEN LAMP SOCKET
REMOVAL".
5. Disconnect the wire leads from the temperature fuse
(Magnetron).
6. Remove the one (1) screw holding the temperature fuse
(Magnetron) to the oven cavity.
7. Now, the temperature fuse (Magnetron) is free.
COOLING FAN MOTOR REMOVAL
1. Disconnect the power supply cord, remove the oven
from wall and remove outer case (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal".)
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Disconnect the wire leads from the fan motor and the
chassis support.
5. Remove one (1) screw holding the hood duct to oven
cavity.
6. Release the wire leads from the hole of the hood duct.
7. Lift up the fan motor side of the hood duct.
8. Remove the two (2) screws holding the fan motor to the
hood duct.
9. Remove the fan blade from the fan motor shaft according
the following procedure.
10.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 pinched by pliers and
metal pieces may be produced.
* Do not touch the pliers to the coil of the fan motor
because the coil may be cut or injured.
* Do not disfigure the bracket by touching with the
pliers.
11.Remove the fan blade from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.
12. 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.
13.Now, the fan motor is free.
INSTALLATION
1. Install the fan blade to the fan motor shaft according to
the following procedure.
2. Hold the center of the bracket which supports the shaft
of the fan motor on the flat table.
3. Apply the screw lock tight into the hole (for shaft) of the
fan blade.
4. 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.
5. Install the fan motor to the hood duct with the two (2) screws.
CAUTION:
* Do not hit the fan blade hard when installing 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. Install the hood duct to the oven cavity with the one (1)
screw.
36
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7. Re-install the wire leads to the hole of the hood duct.
8. Connect the wire leads to the fan motor and chassis
support, referring to the pictorial diagram.
9. Refer to procedure of "OUTER CASE REMOVAL". And
reverse their procedure. And re-install the outer case.
Coil
Shaft
Groove joint pliers
Shaft
Stator
Gap
Bracket
These are the positions
that should be pinched
with pliers.
Axis
Rotor
Rear View
Stator
Table
Center of
bracket
Rotor
Side View
TURNTABLE MOTOR REMOVAL
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. Remove the three (3) screws holding the base cover to
the oven cavity.
4. Open the base cover from the oven cavity by pulling down.
5. Disconnect the wire leads from the turntable motor.
6. Remove one (1) screw holding turntable motor to the
oven cavity.
7. Now the turntable motor is free.
STIRRER MOTOR REMOVAL
5. Disconnect the wire leads from the stirrer motor.
6. Remove the two (2) screws holding the stirrer motor to
the waveguide of the oven cavity.
7. Remove the stirrer motor from the waveguide.
8. Now, the stirrer motor is free.
9. When installing the stirrer motor, the shaft of stirrer motor
must be inserted to the stirrer fan shaft. Refer to the
procedure of "STIRRER COVER AND STIRRER FAN
INSTALLATION".
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and Outer case Removal")
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Remove the hood fan motor and the hood duct from the
oven cavity, referring to the procedure of " HOOD FAN
MOTOR, HOOD DUCT AND OVEN LAMP SOCKET
REMOVAL".
STIRRER COVER AND STIRRER FAN INSTALLATION
1. Put the stirrer fan on the stirrer cover to match the stirrer
fan shaft to the center of the stirrer support.
2. Insert the shaft of stirrer fan to the shaft of stirrer motor.
3. Insert the cutout of stirrer cover to the tabs on the ceiling.
4. Install the stirrer cover to the oven cavity, and secure it
by one canoe clip.
Shaft
Stirrer Fan
Stirrer Cover
Canoe Clip
OVEN LAMP REMOVAL
1. Disconnect the power supply cord.
2. Remove one (1) screw holding the hood exhaust louver
to oven cavity front flange.
3. Remove the hood exhaust louver from the oven by
pushing the right and left tabs of the hood exhaust louver.
(Refer to procedure of "HOOD EXHAUST LOUVER
4.
5.
6.
7.
REMOVAL")
Lift the oven lamp cover up.
Now, the oven lamp and the socket are found.
Screw the oven lamp off from the lamp socket.
Now, the oven lamp is free.
CONTROL PANEL ASSEMBLY, CONTROL UNIT AND KEY UNIT REMOVAL
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. Remove one (1) screw holding the hood exhaust louver
to oven cavity front flange.
4. Remove the hood exhaust louver from the oven by
pushing the right and left tabs of the hood exhaust louver.
(Refer to procedure of "HOOD EXHAUST LOUVER
REMOVAL")
5. Remove one (1) screw holding the control panel to the
oven cavity front face plate.
6. Release the control panel from the oven cavity front face
plate by lifting it up.
37
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7. Disconnect the wire leads from the relay RY1.
8. Disconnect the connectors CN-A, CN-B, CN-F, CN-E
and CN-H from the control unit.
9. Remove the control panel assembly from the oven.
10.Now, the control panel assembly is free.
11.Disconnect the connector CN-G from the control unit.
12.Release the four (4) screws holding the LSI unit to the
key fixing plate.
13.Remove two (2) screws holding the power unit to the key
fixing plate.
14.Release the two (2) tabs holding the power unit to the key
fixing plate.
15.Now, the control unit is free.
16.Remove the one (1) screw holding the key fixing plate to
the control panel.
17.Release the nine (9) tabs holding the key fixing plate to
the control panel.
18.Remove the key fixing plate from the control panel.
19.Tear the key unit from the key fixing plate.
20.Now, the key unit is free
NOTES FOR KEY UNIT REPLACEMENT
1. Do not reuse the torn key unit because the performance
of the adhesive becomes weak.
2. Before attaching a new key unit, wipe off remaining
adhesive on the key fixing plate surfaces completely with
a soft cloth soaked in alcohol.
3. When attaching the key unit to the key fixing plate, adjust
the upper edge and right edge of the key unit to the
correct position of key fixing plate.
4. Stick the key unit firmly to the key fixing plate by rubbing
with soft cloth not to scratch.
POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL
Terminal
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
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, INSTALL THE POSITIVE LOCK® SO THAT THE
LEVER FACES YOU.
2
Pull down
Positive lock ® connector
STOP SWITCH, PRIMARY INTERLOCK SWITCH, SECONDARY INTERLOCK SWITCH AND
MONITOR SWITCH REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Remove the control panel assembly, referring to the
procedure of "CONTROL PANEL ASSEMBLY ,
CONTROL UNIT AND KEY UNIT REMOVAL".
5. Remove the two (2) screws holding the latch hook to the
oven cavity front flange.
6. Remove the latch hook from the oven cavity front flange.
7. Disconnect the wire leads of each switch.
8. Remove each switch from the latch hook by pushing the
one (1) stopper tub holding each switch.
9. Now, each switch is free.
Re-install
1. Re-install each switch in its place. The secondary interlock
switch is in the lower position, stop switch and primary
interlock switch are in the upper position and the monitor
switch is in the middle position.
2. Re-connect wire leads to each switch. Refer to pictorial
diagram.
3. Secure the latch hook (with two (2) mounting screws) to
oven cavity front 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".
STOP SWITCH, PRIMARY INTERLOCK SWITCH, SECONDARY INTERLOCK SWITCH AND
MONITOR ADJUSTMENT
4. Remove the control panel assembly, referring to the
procedure of "CONTROL PANEL ASSEMBLY ,
CONTROL UNIT AND KEY UNIT REMOVAL".
If the stop switch, secondary interlock switch and monitor
switch do not operate properly due to a misadjustment, the
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
38
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R-1754
2. The contact of primary interlock switch and secondary
interlock switch open within 1.2mm gap between right
side of cavity face plate and door when door is open.
3. Monitor switch contacts close when door is opened.
4. The stop switch contacts open when door is open.
5. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
following adjustment should be made.
5. Loosen the two (2) screws holding latch hook to the oven
cavity front flange.
6. 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 primary interlock
switch and secondary interlock switch are activated with
the door closed. The horizontal position of the latch hook
should be adjusted so that the monitor switch and stop
switch are activated with the door closed.
7. Secure the screws with washers firmly.
8. Check all of the switches operation. If any switch has not
activated with the door closed, loosen screw and adjust
the latch hook position.
Latch
Hook
Stop
Switch
Latch
Heads
Primary
Interlock
Switch
After adjustment, check the following.
1. In and out play of door remains less than 0.5mm when in
the latched position. First check upper position of latch
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.
Monitor
Fuse
Monitor
Switch
Door
Secondary
Interlock
Switch
Figure C-1. Latch Switch Adjustments
DOOR REPLACEMENT
7. Re-install the hood exhaust louver to the oven cavity
front face plate.
Note: After any service to the door;
(A) Make sure that stop switch, primary interlock switch
and secondary interlock switch are operating
properly. (Refer to chapter "Test Procedures".)
(B) An approved microwave survey meter should be
used to assure compliance with proper microwave
radiation emission limitation standards.
DOOR ASSEMBLY REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Remove the hood exhaust louver from the oven cavity by
pushing the right and left tabs of the hood exhaust louver.
(Refer to the procedure of "HOOD EXHAUST LOUVER
REMOVAL".)
5. Insert a putty knife (thickness of about 0.5mm) into the
gap A between the door stopper and the choke cover
as shown in Figure C-3 to free engaging parts.
6. Lift up the door stopper.
7. Now, the door stopper is free from the door assembly.
8. Lift up the door assembly to release the upper and lower
door hinge pins from the upper and lower oven hinges.
9. Now, the door assembly is free.
Tab
Hood Exhaust Louver
Upper Door
Hige Pin
RE-INSTALL
Louver Clip
Tab
Upper
Oven
Hige
Door assembly
Note: When the individual parts are replaced, refer to
"Door Disassembly".
Lower
Oven Hige
DOOR ASSEMBLY RE-INSTALL
1. On re-installing door, insert the lower oven hinge to lower
door hinge pin.
2. Insert the upper oven hinge to the upper door hinge pin.
3. Shut the door (close the contacts of interlock switches).
4. Make sure upper and lower oven hinges are inserted into
the upper an lower door hinge pins.
5. Make sure the door is parallel with oven face lines (left
and upper side lines) and door latch heads pass through
latch holes correctly.
6. Re-install the door stopper to the door assembly.
Latch
Heads
Lower Door
Hige Pin
Door Stopper
RE-INSTALL
Figure C-2. Door Replacement and adjustment
After any servicing, make sure of the following :
1. Door latch heads smoothly catch latch hook through
39
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R-1754
latch holes and that latch head goes through center of
latch hole.
2. Deviation of door alignment from horizontal line of cavity
face plate is to be less than 1.0mm.
3. Door is positioned with its face pressed toward cavity
face plate.
4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
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 air-tight, 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.
DOOR DISASSEMBLY
LATCH SPRING, LATCH HEAD AND DOOR PANEL
13.Release the latch spring from the tab of the latch head
and tab of the door frame.
14.Release the latch head from the door frame.
15.Now, the latch spring, latch head and door frame are
free.
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"Removal of Oven from Wall" and "Outer case Removal")
2. Open the door and block it open.
3. To discharge high voltage capacitor, wait for 60 seconds.
4. Remove the hood exhaust louver from the oven cavity by
pushing the right and left tabs of the hood exhaust louver.
(Refer to the procedure of "HOOD EXHAUST LOUVER
REMOVAL".)
5. Remove door assembly, refer to "Door Replacement".
Replacement of door components are as follows:
6. Place door assembly on a soft cloth with latches facing
up.
Note: As the engaging part of choke cover and door frame
are provided at 15 places, do not force any particular
part.
A
Door Stopper
Choke Cover
Putty Knife
CHOKE COVER
7. Insert a putty knife (thickness of about 0.5mm) into the
gap A between the choke cover and door stopper and
between the choke cover and the door frame as shown
Figure C-3 to free engaging parts.
8. Pry the choke cover by inserting a putty knife in order
shown in Figure C-3.
9. Now choke cover is free from door panel and door frame.
Door Frame
Figure C-3. Door Disassembly
DOOR GLASS
16.Remove the glass stopper from the door frame by
releasing the tab of door frame.
17.At first, slide the door glass rightwards (toward the glass
stopper side), and then slide it up. And release it from the
left and lower long tabs of the door frame.
18.Release the door glass from the upper long tab of the
door frame.
19.Now, the door glass is free.
DOOR FRAME
10.Remove six (6) screws holding the door panel and the
door handle to the door frame assembly.
11.Release the door frame assembly from the door panel.
NOTE: It is easier to release the engaging parts of the upper
or lower door hinge pin side at first.
12.Now, door frame assembly is free.
40
1
2
3
41
4
1
RY4
RY3
RY2
RY1
CN-A
7
(POWER UNIT)
CN-B
CN-C
1
1
3
CN-F
1 RED
YLW
WHT
BLK
5
BLK
1 WHT
2
5
4
3
YLW
RED
8
7
6
ORG
9
COM.
SECONDARY
INTERLOCK
SWITCH
N.O.
BLK
N.C.
MONITOR
SWITCH
BLK
RED
FUSE &
HOLDER
GRY
GRY
ORG
WHT
Blue Marking
WHT
WHT
RED
RED
YLW
RED
WHT
RED
ORG
RED
MAGNETRON
TEMPERATURE
FUSE
RED
OVEN LAMP & SOCKET
Blue
Marking
2
BLK
YLW
3
1
GRN
INVERTER
WIRE ASSEMBLY
RED
BLU
To inverter
angle
M
AC3 A
N
C
F
MAGNETRON
FA
FA
Earth
F
INVERTER
UNIT
RR
E E
DD
HIGH VOLTAGE
WIRE ASSEMBLY
HIGH VOLTAGE COMPONENTS
WHT
PWM WIRE ASSEMBLY
WHT 2 BLU
RED 1 RED
ORG
ORG
GRY
WHT
RED
RED
GRN
STIRRER MOTOR
FAN
MOTOR
HOOD FAN
THERMAL
CUT-OUT
1 BLU
HOOD LAMPS
& SOCKETS
WHT
WHT
Figure S-1. Pictorial Diagram
WHT
WHT
COM.
WHT
WHT
TURNTABLE
MOTOR
BLK
WHT
WHT
G
R
Y
BLU
OVEN
THERMAL
CUT-OUT
BLK
BLU
4
CN-B
2 RED
1 RED/ORG
1 RED
2
5
4
3
6
7
CN-A
STOP SWITCH
HARNESS
BLK
WHT
D
2 12
CN-C
2 GRN
CN-E
BLK
3 YLW
2
QRG
QRG
RED
BLK
GRN
3
CN-E
1
12
IC1
(LSI UNIT)
CONTROL UNIT
CN-G
3
1
G
1 GRN
N.O.
STOP SWITCH
GRN
Power Supply
cord 120V 60Hz
2
9
H
COM.
PRIMATY
INTERLOCK SWITCH
F
SENSOR GROUND WIRE
GRN
AH SENSOR
COM.
GRN
3 BLK
A
RED
BLK
WHT 2 WHT
GRN 1 GRN
1
to chassis support
CN-F
1 BLK
2 RED
3 WHT
N.O.
E
RED 5 RED
YLW 4 YLW
WHT 3 WHT
BLK 2 BLK
C
HOOD FAN MOTOR
B
to Chassis support right
6
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5
6
A
B
C
6
D
E
F
G
H
R-1750
R-1751
R-1752
R-1754
2
1
4
3
6
5
A
A
CN-A
R2 91 1w
B
T1
7
d
D1
S1NB10
b
C
MOTOR
RUN
CAPACITOR
N.O.
AC
COM
A7
C100
7µ/230v
C8
GND
C4
BZ/EN
C9
BZ
C11
INV. COM
OVEN LAMP
FAN MOTOR
STIRRER
MOTOR
D21
RY1
C
D
RY2
C5
TURNTABLE
MOTOR
C3
HOOD LAMP
C6
HOOD MOTOR
HIGH/LOW
C10
HOOD MOTOR
COM.
C12
STOP
SWITCH
R20 1k 1/2w
CN-B
HOOD LAMP
VA
A3
R110 47 1/2w
E
C2
B
D22
TURNTABLE
MOTOR
–
c
A1
INV. COM
OVEN LAMP
FAN MOTOR
STIRRER
MOTOR
D
+
GND
(J1)
a
VR
SP30
AC120V
60Hz
C1
ZD1
HZ-16-1
1
R1 2.4k
5
C2 1000µ/35v
3
INT
Q1
2SD1859
C1 0.1µ/50v
VRS1
10G471K
A5
AC
R3 91 1w
C7
B9
C110 0.033µ/250v
B1
HOOD THERMO
B5
HOOD MOTOR
COM.
B7
D23
LOW
HOOD MOTOR
HIGH
E
SSR1
B3
D24
RY4
F
RY3
E1
STOP
SWITCH
CN-E
D20
E2
CN-C
12pin WIRE
HARNESS
G
NOTE :
F
G
: IF NOT SPECIFIED, 1SS270A
H
H
Figure S-2. Power Unit Circuit
1
2
4
3
42
5
6
CN-H
H3
H2
H1
F3
F2
F1
DOOR
CN-C
HOOD
MOTOR
HIGH/LOW
HOOD
MOTOR
COM.
TURNTABLE
MOTOR
LAMP HOOD
INV. COM.
OVEN LAMP
FAN MOTOR
STIRRER
MOTOR
BUZZER
+
–
R140
470 1/4w
R43 1.8kF
C10 10µ/35v
C12
Q25
KRC101S
Q24
KRC101S
C10
C6
Q23
KRC101S
–
C5
C11 0.1µ/50v
Q22
KRC101S
Q20
KRA102S
+
VR
Q21
KRC101S
Q31
KRC101S
R142 47k
R141 220k
Q140 KRA101S
Q32
KRC101S
Q30
KRA101S
R41 3.32kD
C40 0.1µ/50v
R40 330 1w
C3
C11
C9
BUZZER ENV. C 4
PWM
MCK
GND
Inverter
CN-F
AH
SENSOR
C7
C44
0.1µ/50v
C30 10µ/35v
INT
–
C22
10µ/35v
C45
0.1µ/50v
R30
3.3k
C17
0.1µ
/50v
D40
MA152WK
C8
2
1
5
R72 15k
R71 15k
R70 15k
R42 3.57kD
ZD10
UDZ5.6B
IC3
KIA358FEL
C41
0.015µ/25v
R46 47k
R20 15k
C20
–
C42
(J12) 4.7k
R80 4.7k
IC1
IXA029DR
G1
G2
G3
TEST POINT
G14
Pasta
Grains
Light
Options
MINUTE
PLUS Poultry
G11
G8
31
R62 15k
G9
G10
6
G4
Figure S-3. LSI Unit Circuit
TOUCH PANEL
G7
50
R81 20
A11
A10
A9
A8
Vss
A7
A6
A5
A4
A3
A2
A1
A0
Vcc
D15
D14
D13
D12
D11
D10
WH-1
40
A12
A11
A10
A9
A8
NC
NC
A18
A17
A7
A6
A5
A4
28
LED2
CPU UNIT
LED1
IC2
IXA062DR
NOTE :
18
GND
A2
A1
A0
R99 15k
C19 0.1µ/25v
: IF NOT SPECIFIED, 1/10W ± 5%
: IF NOT SPECIFIED, 0.01µF / 25V
C110
SDA 5 4
SCL
WP
VCC 8 1
IC4
S24C01AFJA-01
5
D6
D13
D5
D12
D4
VCC
VCC
GND
D11
D3
D10
D2
D9
D1
WH-1
6
4
8
TH1
R90 43kF
5G20P40B333J
R91 18kF
C97 0.1µ/25v
R98
1M
C96 0.1µ/25v
7
IC3
KIA358FEL
21
27
1
GND1
VLCD1
VCC1
V50
V40
V30
V20
V10
GREF
IREFM
IREFP
VLCD2
VLCD3
VCC2
GND2
GND3
VCC3
OSC1
OSC2
OSC
C0
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
46
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
COM3
COM2
COM1
SEG3
SEG2
SEG1
COM50
COM49
5
KEY UNIT
Keep
Warm
START Turntable
On/Off
STOP/
CLEAR
G12
Defrost
3+6
Beverage
Center
Meats
Reheat
Set Up
Popcorn Vegetables
G6
Frozen
Food
More from
Fan
Baked
Fish/
Your
Potatoes Seafood Options Microwave
6x6
VCC
G5
C15 0.1µ/25v
CF1
C18
CST12.00MTW 0.1µ
/25v
(J13)
(J11)
R13 4.7k
C12
G13
100
AN1
AN2
AN3
AN4
AN5
DA0
DA1
Avss
IRQ0
P81
P82
CS1
CS0
Vss
PA0
PA1
PA2
PA3
PA4
PA5
5
4
Q12
KRC101S
(J10) 4.7k
81
8
1
Q80
KTC1027
5
4
R69 15k
R68 15k
R44 360kF
8
4
3
R51 75kF
C63 330p/50v
GND
C21 0.1µ/25v
R11
1.2k
1/4w
R52 37.4kF
C64 330p/50v
+
C16
R76 270k
+
R50 150kF
C62 330p/50v
R45 10k
R49 300k
C61 330p/50v
C43
C14
R75 270k
C2
80
VA
R74 270k
NC
VCC
V0
Cd
NC
NC
NC
GND
C140
100p/50v
1
VCC
R82
2k
1/2w
R61 15k
Q10 KTC1027
R60 15k
R10 470 1/2w
R48 620k
R21
4.7k
C60 330p/50v
R47 47k
IC6
M51953AFP
R73 270k
VA
R67 15k
51
30
C13 47µ/16v
R77 270k
4
R66 15k
27
41
VR
A3
A2
A1
D81
D80
1SS355 1SS355
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
TIOCA2
A20
Vcc
TM00
PB1
PB2
PB3
PB4
PB5
PB6
PB7
RES0
Vss
TxD0
P91
RxD0
P93
P94
P95
P40
P41
P42
P43
Vss
P44
P45
P46
P47
D8
D9
R65 15k
43
R64 15k
3
R63 15k
A13
A14
A15
A16
BYTE
GND
D15/A-1
D7
D14
0E
D0
D8
C1
R110 4.7k
19
4
2
A0
45 CE
1 GND
1
R111 4.7k
G
R112 47k
F
C98
E
R100
4.7k
D
3
C112
0.1µ
/25v
C
R92 20kF
B
2
R113
150
1/2w
1
IC5 IXA031DR
A
LIQUID CRYSTAL DISPLAY
100 x 160 Dots
H
VR
R-1750
R-1751
R-1752
R-1754
6
A
B
C
D
E
F
G
H
R-1750
R-1751
R-1752
R-1754
11
13
15
7 6 5 4 3 2
QKITPB032MRE0
9
C110
RY3
RY4
1
D22
12
2 D20
(J1)
DOOR SW
CN - E
3
D21
SP30
AC
RY2
7
CN - C
1
1
7
E
1
R1
3
ZD1
T1
XA
1
MOTOR RUN
CAPACITOR
5
B
Q1
AC
VRS1
R2
R3
S
P
TTM
CN - A
D1
C2
VH
C1
C100
44
2
6
5
4
3
2
1
G
G
RY1
C
C
F
F
E
E
R20
D24
D23
SSR1
VH
D
D
R110
CN - B
B
DIP
9
1
B
6
5
4
3
2
1
A
A
H.M H.M H.T H.M H.L
L
H
COM
XA
H
H
Figure S-4. Printed Wiring Board
R-1750
R-1751
R-1752
R-1754
PARTS LIST
Note: The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V.
REF. NO.
"§" MARK: PARTS DELIVERY SECTION
PART NO.
§
DESCRIPTION
1- 1
1- 2
1- 3
1- 4
1- 5
1- 6
1- 7
1- 8
1- 9
1-10
1-11
1-12
1-13
1-14
1-15
1-16
D1
D11
D12
Q1
Q2
Q3
VRS2
VRS3
VRS3
RMOTEA346WRE0
RLMPTA068WRE0
QFS-TA013WRE0
RMOTDA211WRE0
RMOTDA214WRE0
RTHM-0044MRE0
RTHM-A070WRE0
RV-MZA309WRZZ
QFSHDB003MRE0
QSW-MA085WRE0
FFS-BA016/KIT
FACCDB011MRE0
QSOCLB006MRE0
FMOTEA402WRK0
FDTCTA201WRK0
DPWBFC071WRUZ
RBR--A001VBE0
RH-DZA059DRE0
RH-DZA079DRE0
RH-TZA137DRE0
VS2SC1740S/-3
VS2SA673///-3
RH-VZA041DRE0
RH-VZA010DRE0
RH-VZA042DRE0
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
J
J
J
J
J
J
J
J
J
Fan motor
Oven lamp
Temperature fuse 150˚C (Magnetron)
Turntable motor
Stirrer motor
Thermal cut-out N.O. 60˚C (Hood Fan)
Thermal cut-out 145˚C (Oven)
Magnetron
Fuse holder
Secondary interlock/primary interlock/stop switches
Monitor switch (V-16G-2C25) with fuse 20A assembly
Power supply cord
Oven lamp socket
Hood fan motor
AH Sensor
Inverter unit
Bridge diode
High voltage diode (UX-F0B)
High voltage diode (UX-F0BL)
Power transistor (CT60AM-18F)
Transistor (2SC1740S)
Transistor (2SA673)
Varistor (ENC271D-14A)
Varistor (TNR15G471K356)
Varistor (ENC471-14A-TJ-B) (INterchangeable)
2- 1
2- 2
2- 2
2- 2
2- 2
2-2-1
2- 3
2- 4
2- 5
2- 5
2- 5
2- 5
2- 6
2- 7
2- 7
2- 7
2- 7
2-7-1
2-7-1
2-7-1
2-7-1
2-7-2
2- 8
2- 8
2- 8
2- 8
LSTY-B021MRP0
FDIF-B004MRK0
FDIF-B005MRK0
FDIF-B006MRK0
FDIF-B001MRK0
LANGTB051MRP0
GDAI-B059MRP0
PCUSUB040MRP0
GCABUB084MRP0
GCABUB090MRP0
GCABUB100MRP0
GCABUB084MRP0
TMAPCB064MRR0
FANGKB009MRY0
FANGKB010MRY0
FANGKB013MRY0
FANGKB009MRY0
LANGQB016MRP0
LANGQB020MRP0
LANGQB049MRP0
LANGQB016MRP0
PGLSPB004MRE0
PCOVPB091MRT0
PCOVPB092MRT0
PCOVPB090MRT0
PCOVPB091MRT0
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
Rear stay
Hood exhaust louver [R-1750]
Hood exhaust louver [R-1751]
Hood exhaust louver [R-1752]
Hood exhaust louver [R-1754]
Louver clip
Right base plate
Base cover cushion
Outer case cabinet [R-1750]
Outer case cabinet [R-1751]
Outer case cabinet [R-1752]
Outer case cabinet [R-1754]
Schematic diagram
Hood lamp glass assembly [R-1750]
Hood lamp glass assembly [R-1751]
Hood lamp glass assembly [R-1752]
Hood lamp glass assembly [R-1754]
Hood lamp glass angle [R-1750]
Hood lamp glass angle [R-1751]
Hood lamp glass angle [R-1752]
Hood lamp glass angle [R-1754]
Hood lamp glass
Base cover [R-1750]
Base cover [R-1751]
Base cover [R-1752]
Base cover [R-1754]
Q'TY CODE
ELECTRIC PARTS
∆*
*
*
*
*
*
1
3
1
1
1
1
1
1
1
3
1
1
3
1
1
1
1
1
1
1
1
1
1
1
1
AR
AE
AG
AL
AQ
AH
AG
BD
AD
AE
AF
AP
AE
BE
AR
BQ
AM
AH
AL
AT
AB
AB
AF
AE
AF
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AF
AW
AW
AW
BD
AG
BC
AA
BA
BC
BB
BA
AB
AN
AM
AK
AN
AG
AG
AG
AG
AH
AY
AY
AY
AY
1
1
1
1
1
1
1
1
1
1
5
BA
AF
AB
AB
AV
AA
AF
AK
AC
AG
AA
CABINET PARTS
CONTROL PANEL PARTS
3- 1
3- 1A
3- 1B
3- 1C
3- 1D
C1
C2
C100
C110
D1
D20-24
DPWBFB097MRU0
QCNCMA447DRE0
QCNCMA448DRE0
QCNCMA275DRE0
FW-VZB181MRE0
RC-KZA087DRE0
VCEAB31VW108M
RC-QZB014MRE0
RC-QZB019MRE0
RSRCDA013DRE0
VHD1SS270A/-1
M
M
M
J
M
J
J
M
M
J
J
Power supply unit
4-pin connector CN-A
5-pin connector CN-B
2-pin connector CN-E
12pin lead wire harness CN-C
Capacitor
0.1 uF
50V
Capacitor
1000 uF
35V
Capacitor
7 uF
230V
Capacitor
0.033 uF
250V
Diode bridge (S1NB10)
Diode (1SS270A)
45
R-1750
R-1751
R-1752
R-1754
REF. NO.
Q1
R1
R2-3
R20
R110
RY1
RY2-3
RY4
SSR1
SP1
T1
VRS1
ZD1
3- 2
3- 3
3- 3
3- 3
3- 3
3- 3-1
3- 3-1
3- 3-1
3- 3-1
3- 3-2
3- 3-2
3- 3-2
3- 3-2
3- 3-3
3- 3
PART NO.
VS2SD1859//-3
VRD-B12EF242J
VRS-B13AA910J
VRD-B12HF102J
VRS-A12HA470J
RRLY-A113DRE0
RRLY-B004MRE0
RRLY-A112DRE0
RTR--A001DRE0
RALM-A014DRE0
RTRNPB020MRE0
RH-VZA032DRE0
VHEHZ161///-1
DUNT-B036MRK0
FPNLCB319MRK0
FPNLCB322MRK0
FPNLCB326MRK0
FPNLCB327MRK0
FUNTKB264MRE0
FUNTKB264MRE0
FUNTKB270MRE0
FUNTKB271MRE0
HPNLCB129MRR0
HPNLCB132MRR0
HPNLCB133MRR0
*************
XEPSD30P10XS0
XEPSD30P10XS0
§
J
J
J
J
J
M
M
M
M
J
M
J
J
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
DESCRIPTION
Transistor (2SD1859R)
Resistor
2.4k ohm
1/4W
Resistor
91 ohm
1W
Resistor
1k ohm
1/2W
Resistor
47 ohm
1/2W
Relay (DU24D1-1PR(M))
Relay (FTR-F3AA024E)
Relay (VE24HSE-K)
Solid state relay
Buzzer (PKM22EPT)
Transformer
Varistor (10G471K)
Zener diode (HZ16-1)
LSI unit
Control panel sub. assembly [R-1750]
Control panel sub. assembly [R-1754]
Control panel sub, assembly [R-1751]
Control panel sub, assembly [R-1752]
Key unit [R-1750]
Key unit [R-1754]
Key unit [R-1751]
Key unit [R-1752]
Control panel [R-1750]
Control panel [R-1751]
Control panel [R-1752]
Control panel (Not replaceable part) [R-1754]
Screw; 3mm x 10mm
Screw; 3mm x 10mm
Q'TY CODE
1
AC
1
AA
2
AC
1
AA
1
AH
1
AG
2
AG
1
AH
1
AG
1
AG
1
BE
1
AE
1
AA
1
BQ
1
BD
1
BG
1
BD
1
BD
1
AR
1
AR
1
AR
1
AR
1
AQ
1
AQ
1
AQ
1
-1
AB
6
AB
OVEN PARTS
∆
∆
4- 1
4- 2
4- 3
4- 4
4- 5
4- 6
4- 7
4- 8
4- 9
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
4-18
4-19
4-20
4-21
4-22
4-23
4-24
FFTA-B005MRK0
FROLPB025MRK0
NTNT-A090WRE0
LANGQB048MRP0
FCOVPB016MRK0
FFAN-B012MRK0
*************
PPACGB014MRF0
PHOK-B017MRF0
LANGTB050MRP0
NFANPB001MRE0
LBSHC0037WRE0
PCOVPB065MRP0
PDUC-B095MRP0
PCUSUB039MRP0
PFILWB005MRP0
LANGTB046MRP0
LANGTB040MRP0
PDUC-B094MRF0
LHLD-B012MRF0
LSTPPB031MRF0
PDUC-B098MRP0
PCUSUB047MRP0
PCUSUB045MRP0
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
Exhaust damper assembly
Turntable support assembly
Turntable tray
Inverter angle
Stirrer cover assembly
Stirrer fan assembly
Oven cavity (Not replaceable part)
Turntable motor packing
Latch hook
Unit mounting plate
Fan blade
Cord bushing
Oven lamp cover
Hood intake duct R
Hood intake duct cushion
Lamp filter
Chassis support left
Chassis support right
Hood duct
Rack holder
Door stopper
Magnetron air guide
Air flow cushion
Cabinet cushion
5
5
5
5
5- 1
5- 2
5- 2
5- 2
5- 2
5-2-1
5-2-1
5-2-1
5-2-1
5-2-2
5-2-3
5-2-4
5-2-5
CDORFB253MRK0
CDORFB257MRK0
CDORFB258MRK0
CDORFB256MRK0
FDORFB060MRT0
FCOV-B161MRK0
FCOV-B163MRK0
FCOV-B164MRK0
FCOV-B162MRK0
PGLSPB020MRE0
PGLSPB021MRE0
PGLSPB022MRE0
PGLSPB020MRE0
LSTPPB030MRF0
LSTPPB035MRF0
MSPRTA046WRE0
GWAKPB117MRF0
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
Door assembly [R-1750]
Door assembly [R-1751]
Door assembly [R-1752]
Door assembly [R-1754]
Door panel assembly
Door frame assembly [R-1750]
Door frame assembly [R-1751]
Door frame assembly [R-1752]
Door frame assembly [R-1754]
Front door glass [R-1750]
Front door glass [R-1751]
Front door glass [R-1752]
Front door glass [R-1754]
Latch head
Glass stopper
Latch spring
Door frame [R-1750]
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
4
1
1
2
1
AH
AN
AN
AF
AN
AG
-AA
AG
AP
AC
AB
AD
AM
AA
AB
AD
AE
AL
AF
AC
AC
AD
AD
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
BG
BG
BG
BG
AX
BD
BD
BD
BD
AQ
AQ
AQ
AQ
AC
AC
AB
AZ
DOOR PARTS
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
∆
46
R-1750
R-1751
R-1752
R-1754
∆
∆
∆
REF. NO.
5-2-5
5-2-5
5-2-5
5- 3
5- 4
5- 5
5- 5
5- 5
5- 5
5- 6
5- 7
PART NO.
GWAKPB118MRF0
GWAKPB119MRF0
*************
FCOVHB005MRK0
PSHEPB024MRE0
FHNDPB005MRK0
FHNDPB007MRK0
FHNDPB008MRK0
FHNDPB006MRK0
XCPSD40P08000
XCPSD40P12000
§
M
M
M
M
M
M
M
M
M
M
M
DESCRIPTION
Door frame [R-1751]
Door frame [R-1752]
Door frame(Not replaceable part)
Choke cover assembly
Sealer film
Door handle assembly [R-1750]
Door handle assembly [R-1751]
Door handle assembly [R-1752]
Door handle assembly [R-1754]
Screw : 4mm x 8mm
Screw : 4mm x 12mm
6- 1
6-1-1
6-1-2
6-1-3
6-1-4
6-1-5
6-1-6
6-1-7
6- 2
6- 3
6- 4
6- 5
6- 6
6- 7
6- 8
6- 9
6-10
6-11
6-12
6-13
6-14
6-15
6-16
6-17
6-18
6-19
CFZK-B131MRK0
LBSHC0040MRE0
LX-BZ0195WRE0
LX-MZB001MRE0
XBRSD50P60000
XOTSD40P12000
XTSSD50P35000
XWHSD50-16300
TINSEB227MRR0
TINSEB228MRR0
TINSKB047MRR0
TINSKB048MRR0
FW-QZB011MRE0
FW-VZB178MRE0
TCAUAB041MRR0
TCAUAB037MRR0
TCAUAB005MRR0
FW-VZB149MRE0
PFIL-B004MRE0
PFIL-B002MRE0
PCLICB003MRE0
UAMI-B009MRM0
QW-VZB010MRE0
TCAUAB018MRR0
FW-VZB180MRE0
FW-QZB179MRE0
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
Installation material assembly
Grommet
Toggle screw
Cord holder
Screw : 5mm x 60mm
Screw : 4mm x 12mm
Screw : 5mm x 35mm
Washer
Installation instruction
Operation manual
Top template
Wall template
High voltage wire assembly
Main harness
DHHS sevice caution label
Monitor caution label
DHHS caution label
Stop switch harness
Charcoal filter
Grease filter
Canoe clip
Rack
Sensor ground wire
Cleaning label
Inverter wire assembly
PWM wire assembly
[R-1754]
Q'TY CODE
1
AZ
1
AZ
1
-1
AH
1
AF
1
AP
1
AP
1
AP
1
AP
4
AA
2
AA
MISCELLANEOUS
*
1
1
4
1
2
1
6
2
1
1
1
1
1
1
2
1
1
1
1
2
1
1
1
1
1
1
AM
AC
AC
AB
AC
AA
AA
AA
AC
AC
AC
AB
AG
AH
AA
AA
AB
AM
AH
AF
AA
AR
AB
AC
AD
AD
2
4
4
4
4
13
2
4
2
5
2
2
3
1
2
AA
AB
AA
AA
AB
AA
AA
AA
AA
AA
AA
AD
AA
AA
AA
SCREWS,NUTS AND WASHERS
7- 1
7- 2
7- 2
7- 2
7- 2
7- 3
7- 4
7- 5
7- 6
7- 7
7- 8
7- 9
7-10
7-11
7-12
XCPSD40P08000
XOTSF40P12000
XOTSE40P12000
XOTSD40P12000
XOTSF40P12000
XOTSD40P12000
XBTSD40P08000
LX-CZA038WRE0
LX-CZ0052WRE0
LX-BZ0081YBE0
XCPSD30P08000
LX-BZB012MRE0
XCBSD30P08000
XHTSD40P08RV0
XEPSD40P12000
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
Screw : 4mm x
Screw : 4mm x
Screw : 4mm x
Screw : 4mm x
Screw : 4mm x
Screw : 4mm x
Screw : 4mm x
Special screw
Special screw
Screw : 4mm x
Screw : 4mm x
Unit mounting
Screw : 3mm x
Screw : 4mm x
Screw : 4mm x
8mm
12mm
12mm
12mm
12mm
12mm
8mm
[R-1750]
[R-1751]
[R-1752]
[R-1754]
8mm
8mm
screw
8mm
8mm
12mm
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.
47
R-1750
R-1751
R-1752
R-1754
2
1
4
3
6
5
7-3
OVEN AND CABINET PARTS
4-1
7-10
A
A
1-15
7-3
1-14
4-13
2-1
7-5
4-19
4-15
7-3
B
4-10
B
2-5
7-3
4-12
4-11
7-4
1-12
4-24
2-6
1-1
C
7-1
,,
C
1-2
1-13
1-7
4-17
7-8
1-5
7-3
D
7-5
4-23
1-3
6-10
7-3
D
4-15
7-9
4-7
2-2
6-12
E
4-23
4-20 x2
7-7
7-3
7-6
1-10
4-9
1-8
7-9
1-9
7-7
7-11
1-11
1-16
6-8
4-16
F
E
4-22
6-9
4-20 x2
2-2-1
4-6
4-18
1-10
4-8
4-5
1-4
7-10
6-13
F
4-14
6-8
4-4
7-8
4-23
7-12
1-6
2-3
4-3
6-14
2-8
G
G
7-3
2-4
7-3
4-2
1-13
6-13
2-7-2
1-2
H
H
2-7
7-2
2-7-1
7-2
1
2
4
3
48
6-17
5
6
R-1750
R-1751
R-1752
R-1754
2
1
4
3
6
5
CONTROL PANEL PARTS
A
3-2
A
3-4
3-4
3-3-2
3-1
3-3-3
7-3
B
B
DOOR PARTS
4-21
3-3-1
3-3
5-4
C
5-1
5
C
5-6
5-6
5-3
5-2-3
D
D
5-2-1
5-7
5-2
5-2-5
E
E
5-2-2
MISCELLANEOUS
5-2-4
5-5
6-7
F
F
6-1
6-1-1
6-1-4
6-6
6-1-5
6-16
G
G
6-1-2
6-1-6
6-18
6-1-7
6-1-3
6-19
6-15
6-11
H
H
1
2
4
3
49
5
6
R-1750
R-1751
R-1752
R-1754
PACKING AND ACCESSORIES
6-13 GREASE FILTER (x 2)
2-2
HOOD EXHAUST LOUVER
,
,
4-3 TURNTABLE TRAY
6-4 TOP TEMPLATE
6-5
6-15
RACK
WALL TEMPLATE
6-2 INSTALLATION INSTRUCTION
6-3
TOP PAD
SPADBB035MRE0
OPERATION MANUAL
6-1 INSTALL MATERIAL ASSEMBLY
DOOR PROTECTOR
SPADP0221MRE0
6-12 CHARCOAL FILTER
WRAP COVER
SSAKH0103MRE0
4-1
EXHAUST DAMPER
ASSEMBLY
ACCESSORY PACK
SPADFA020WRE0
SSAKAB004MRE0
DOOR PAD
BOTTOM PAD
SPADBB034MRE0
Non-replaceable items
PACKING CASE
SPAKCB233MRR17 [R-1750]
SPAKCB233MRR18 [R-1754]
SPAKCB233MRR19 [R-1751]
SPAKCB233MRR20 [R-1752]
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. (8S2.530E) Printed in U.S.A
50