R-1405
R-1406
SERVICE MANUAL
S92M198R1405E
OVER THE RANGE
MICROWAVE OVEN
MODELS
R-1405
R-1406
R-1405
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. (High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..)
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ................... INSIDE FRONT COVER
BEFORE SERVICING ...................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................ 1
MICROWAVE MEASUREMENT PROCEDURE .....................................................................................................2
FOREWORD AND WARNING ................................................................................................................................3
PRODUCT SPECIFICATIONS ............................................................................................................................... 4
GENERAL INFORMATION ...................................................................................................................................4
OPERATION .........................................................................................................................................................7
TROUBLESHOOTING GUIDE ............................................................................................................................. 11
TEST PROCEDURE ............................................................................................................................................ 13
TOUCH CONTROL PANEL ASSEMBLY ............................................................................................................. 22
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE .................................................................. 26
PICTORIAL DIAGRAM ........................................................................................................................................ 34
POWER UNIT CIRCUIT ....................................................................................................................................... 35
LSI UNIT CIRCUIT ............................................................................................................................................... 36
PRINTED WIRING BOARD ................................................................................................................................. 37
PARTS LIST ........................................................................................................................................................ 38
PACKING AND ACCESSORIES ......................................................................................................................... 40
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
SHARP CORPORATION
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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.
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WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with
following parts may result in a severe, possibly
fatal, electrical shock.
(Example)
High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
Don't Touch !
Danger High Voltage
When the testing is completed,
1. Disconnect the power supply cord, and then remove
outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power
transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is
installed.
7. Run the oven and check all functions.
Before Servicing
1. Disconnect the power supply cord
remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
, and then
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
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.
After repairing
1. Reconnect all leads removed from components during
testing.
2. Reinstall the outer case (cabinet).
3. Reconnect the power supply cord after the outer case is
installed.
4. Run the oven and check all functions.
Whenever troubleshooting is performed the power supply
must be disconnected. It may, in some cases, be necessary
to connect the power supply after the outer case has been
removed, in this event,
1. Disconnect the power supply cord, and then remove
outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power
transformer.
5. Ensure that 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.
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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 switch shall prevent microwave radiation emission in excess of the
requirement as above mentioned, secondary interlock relay and door sensing 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±5½C (68½F) 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 primary 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-1405/ R-1406
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-1405 and R1406.
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 not any other visible damage with the oven.
Servicing and repair work must be carried out only by trained service
personnel.
DANGER
Certain initial parts are intentionally not grounded and present
a risk of electrical shock only during servicing. Service
personnel - Do not contact the following parts while the
appliance is energized;
High Voltage Capacitor, Power Transformer, Magnetron, High
Voltage Rectifier Assembly, High Voltage Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.
All the parts marked “*” on parts list are used at voltages more than
250V.
Removal of the outer wrap gives access to voltage above 250V.
All the parts marked “Д on parts list may cause undue microwave
exposure, by themselves, or when they are damaged, loosened or
removed.
SHARP ELECTRONICS CORPORATION
SHARP PLAZA, MAHWAH,
NEW JERSEY 07430-2135
3
OPERATION
TROUBLESHOOTING GUIDE AND
TEST PROCEDURE
TOUCH CONTROL PANEL
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
WIRING DIAGRAM
PARTS LIST
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PRODUCT SPECIFICATION
ITEM
DESCRIPTION
Power Requirements
120 Volts / 13.5 Amperes
60 Hertz
Single phase, 3 wire grounded
Power Output
950 watts (IEC TEST PROCEDURE)
Operating frequency of 2450MHz
Case Dimensions
Width 29-15/16"
Height 15- 9/16"
Depth 16-1/4"
Cooking Cavity Dimensions
Width 17-1/2"
Height 14-15/16"
Depth 9-7/8"
1.5 Cubic Feet
Hood lamp
2 bulbs, 20W x 2, Incandescent light bulbs
Hood fan
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
KEEP WARM pad, POPCORN pad, HOT WATER pad
REHEAT CENTER pads, COOK CENTER pads
DEFROST CENTER pads, Number selection pads
POWER LEVEL pad, TIMER / CLOCK pad
LIGHT button, FAN button,
STOP/CLEAR button, START/ MINUTE PLUS button,
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. 55 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
10
10
1
15
9
5
2
6
8
4
3
7
10 12
13
11
14
1.
2.
3.
4.
5.
6.
7.
8.
9.
Oven door with see-through window.
Door hinges.
Waveguide cover.
Turntable motor shaft.
Oven lamp.
It will light when oven is operating or door is open.
Door latches.
The oven will not operate unless the door is
securely closed.
One touch door open button.
Auto Touch control panel
Time display: Digital display, 99 minutes 99
seconds.
5
10.Ventilation openings.
11.Light Cover.
12.Grease filters.
13.Removable turntable.
The turntable will rotate clockwise or
counterclockwise.
Only remove for cleaning.
14.Removable turntable support.
15. Power supply cord
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CONTROL PANEL
NOTE: Some one-touch cooking features such as "MINUTE PLUS" are disabled after three minutes when the oven is not
used. These features are automatically enabled when the door is opened and closed or STOP/CLEAR button is
pressed.
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OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions during
oven operation.
relay (RY2) 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
secondary interlock relay (RY2) and primary interlock
switch open their contacts. And contacts of the relay
(RY1) remains closed. Then the monitor switch
contacts close.
(2) When the door is closed from the open position, the
monitor switch contacts first open, and then the
contacts of the primary interlock switch and door
sensing switch close. And contacts of the relay (RY1)
open.
If the primary interlock switch and secondary interlock relay
(RY2) fail with their contacts closed when the door is opened,
the closing of the monitor switch contacts will form a short
circuit through the monitor fuse, primary interlock switch,
relay (RY1) and secondary interlock relay (RY2), causing the
monitor fuse to blow.
OFF CONDITION
Closing the door activates the door sensing switch and
primary interlock switch. (In this condition, the monitor switch
contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the
control unit. (Figure O-1).
1. The display will show flashing "88 : 88".
To set any program or set the clock, you must first
touch the STOP/CLEAR button. The display will clear,
and " : " will appear .
COOKING CONDITION
Program desired cooking time touching the NUMBER pads.
When the START button is touched, the following operations
occur:
POWER LEVEL P-0 TO P-90 COOKING
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
RY5, RY6
When Variable Cooking Power is programmed, the 120 volts
A.C. is supplied to the power transformer intermittently
through the contacts of relay (RY2) which is operated by the
control unit within an interval second time base. Microwave
power operation is as follows:
CONNECTED COMPONENTS
Oven lamp / Fan motor / Turntable motor
Power transformer
Hood fan motor
Hood lamp
VARI-MODE
ON TIME
Power 10(P-HI)
32 sec.
(100% power)
Power 9(P-90)
30 sec.
(approx. 90% power)
Power 8(P-80)
26 sec.
(approx. 80% power)
Power 7(P-70)
24 sec.
(approx. 70% power)
Power 6(P-60)
22 sec.
(approx. 60% power)
Power 5(P-50)
18 sec.
(approx. 50% power)
Power 4(P-40)
16 sec.
(approx. 40% power)
Power 3(P-30)
12 sec.
(approx. 30% power)
Power 2(P-20)
8 sec.
(approx. 20% power)
Power 1(P-10)
6 sec.
(approx. 10% power)
Power 0(P-0)
0 sec.
(0% power)
2. 120 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3.3 volts A.C.
output on the filament winding, and approximately 2000
volts A.C. on the high voltage winding.
3. The filament winding voltage heats the magnetron filament
and the H.V. winding voltage is sent to a voltage doubler
circuit.
4. The microwave energy produced by the magnetron is
channelled through the waveguide into the cavity feedbox, and then into the cavity where the food is placed to
be cooked.
5. Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off, and the
generation of microwave energy is stopped. The oven will
revert to the OFF condition.
6. When the door is opened during a cook cycle, monitor
switch, door sensing switch, primary interlock switch,
relay (RY1) and secondary interlock relay (RY2) are
activated with the following results. The circuits to the
cooling fan motor, the turntable motor, and the high
voltage components are de-energized, the oven lamp
remains on, and the digital read-out displays the time still
remaining in the cook cycle when the door was opened.
7. The monitor switch is electrically monitoring the operation
of the primary interlock switch and secondary interlock
OFF TIME
0 sec.
2 sec.
6 sec.
8 sec.
10 sec.
14 sec.
16 sec.
20 sec.
24 sec.
26 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.
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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.
To Duct
To Duct
Hood Fan
Motor
Hood
Intake
Duct R
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.
Hood Fan
Motor
To Duct
Hood
Intake
Duct R
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-240 must be
provided to filter the air before it leaves the oven.
Hood Fan
Motor
Hood Exhaust
Louver
Charcoal
Filter
Hood
Intake
Duct R
8
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NOTE: "
CAVITY
THERMAL
CUTOUT
MAGNETRON
TEMPERATURE
FUSE
RED
ORG
RED
BLK
BLK
ORG
RED
RED
CONTROL UNIT
COM.
E2
RY5
(RY1)
HOOD
CAPACITOR
E1
(RY2)
SECONDARY
INTERLOCK
RELAY
OVEN LAMP
RELAY
F1
WHT
RED
BRN
WHT
WHT
WHT
WHT
WHT
MONITOR
SWITCH
FM FAN
MOTOR
WHT
YLW
RED
HOOD
LAMP
TURN
TTM TABLE
MOTOR
OL OVEN
LAMP
GRY
HL
HL
WHT
WHT
WHT
HIGH
VOLTAGE
CAPACITOR
xx uF
ORG
GRY
GRY
BRN
COM.
WHT
WHT
BRN
RED
WHT
BLU
N.O.
ORG
BRN
B1
A3
HOOD
MOTOR
BLU
MAGNETRON
F3
A1
YLW
AH SENSOR
F2
BLK
120VAC GND
60Hz
RED
BLK
POWER
TRANSFORMER
DOOR
SENSING
SWITCH
RY4
RED
ORG
PPL
B3
GRN
RED
N.O.
A5
HOOD FAN
THERMAL
CUT OUT
BLK
ORG
BLK
FUSE
20A
PPL
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. CLOCK APPEARS ON DISPLAY.
" indicates components with potential above 250V.
WHT
GRY PRIMARY
INTERLOCK
SWITCH
Figure O-1. Oven Schematic-Off Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
3. VARIABLE COOKING CONTROL "HIGH".
4. "START" BUTTON PRESSED.
CAVITY
THERMAL
CUTOUT
MAGNETRON
TEMPERATURE
FUSE
RED
ORG
RED
BLK
BLK
ORG
RED
RED
CONTROL UNIT
(RY1)
BLK
F1
AH SENSOR
MAGNETRON
F2
WHT
OL OVEN
LAMP
BRN
ORG
BRN
GRY
GRY
ORG
TURN
TTM TABLE
MOTOR
MONITOR
SWITCH
FM FAN
MOTOR
WHT
WHT
WHT
WHT
COM.
WHT
YLW
RED
YLW
HL
HOOD
LAMP
WHT
WHT
BRN
HL
WHT
N.O.
GRY
B1
A3
BRN
RED
WHT
BLU
E1
RED
(RY2)
SECONDARY
INTERLOCK
RELAY
F3
A1
HOOD
MOTOR
BLU
OVEN LAMP
RELAY
HOOD
CAPACITOR
120VAC GND
60Hz
POWER
TRANSFORMER
DOOR
SENSING
SWITCH
RY4
RED
B3
BLK
RY5
GRN
E2
A5
RED
HOOD FAN
THERMAL
CUT OUT
COM.
WHT
ORG
PPL
PPL
BLK
ORG
BLK
FUSE
20A
RED
N.O.
WHT
WHT
WHT
GRY PRIMARY
INTERLOCK
SWITCH
Figure O-2. Oven Schematic-Cooking Condition
9
HIGH
VOLTAGE
CAPACITOR
xx uF
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DESCRIPTION AND FUNCTION OF COMPONENTS
3. If the door is opened, and the secondary interlock relay
(RY2) and primary interlock switch contacts fail to open,
the monitor fuse blows simultaneously with closing of the
monitor switch contacts.
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE TEST THE DOOR SENSING SWITCH,
SECONDARY INTERLOCK RELAY (RY2),
RELAY (RY1), PRIMARY INTERLOCK SWITCH
AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE").
NOTE: MONITOR FUSE AND SWITCH ARE REPLACED
AS AN ASSEMBLY
DOOR OPEN MECHANISM
The door is opened by pushing the open button on the control
panel, refer to the Figure D-1.
When the open button is pushed, the open button pushes up
the open lever, and then the open lever pushes up the latch
head. The latch heads are moved upward and released from
latch hook. Now the door will open.
Latch heads
Latch hook
Door sensing
switch
Door
TEMPERATURE FUSE (MG)
The temperature fuse located on the fan duct assembly 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 302½F (150½C)
causing the oven to shut down.
NOTE: This is a fuse. It does not reset.
Monitor switch
Open lever
Primary interlock switch
Figure D-1. Door Open Mechanism
DOOR SENSING AND PRIMARY INTERLOCK
SWITCHES
THERMAL CUT-OUT (HOOD )
This thermal cut-out located on the right base plate flange
(turntable motor side). 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 140½F (60½C) or higher, thus
removing this hot air from around microwave oven. When the
temperature around the thermal cut-out drops to 113½F
(45½C) or lower, the thermal cut-out shuts off the hood fan
motor.
The primary interlock switch is mounted in the lower position of the latch hook and the door sensing switch in the
secondary interlock system is mounted in the upper position of the latch hook. They are activated by the latch heads
on the door. When the door is opened, the switches interrupt
the circuit to all components. A cook cycle cannot take
place until the door is firmly closed thereby activating both
interlock switches. The secondary interlock system consists of the door sensing switch and secondary interlock
relay located on the control circuit board.
THERMAL CUT-OUT (CAVITY )
This thermal cut-out is located on the bottom 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 293½F (145½C)
causing the oven to shut down. The defective thermal cut-out
must be replaced with a new one.
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 secondary interlock
relay (RY2) and primary interlock switch fail to open when the
door is opened.
Functions:
1. When the door is opened, the monitor switch contact
close (to the ON condition) due to their being normally
closed. At this time the secondary interlock relay (RY2)
and primary 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 then the door sensing switch
and the primary interlock switch contacts close. (On
opening the door, each of these switches operate
inversely.)
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.
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
10
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vapors given off from the heating foods. It is then exhausted
through the exhausting air vents at the oven cavity.
supplied duct system, or discharged back into the kitchen.
HOOD LAMP
HOOD FAN MOTOR
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 button.
The hood fan motor is a one-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
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)
secondary interlock relay (RY2), door sensing switch and primary 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 the leads to the primary of the power transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
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I
CK
CK
RE
CK
CK
RE
RE
RE
RE
P
O
N
N
N
N
N
M
L
K
J
MONITOR FUSE
LOW VOLTAGE
NO POWER AT OUTLET
SHORT IN POWER CORD
OPENED OR SHORTED WIRING
HOOD MOTOR CAPACITOR
HOOD LAMP OR SOCKET
TURNTABLE MOTOR
FAN MOTOR
OVEN LAMP OR SOCKET
FOIL PATERN ON P.W.B.
DEFROST CENTER
RELAYS (RY-5), (TY6)
RELAY (RY-4)
RELAY (RY-3)
RELAY (RY-2)
RELAY (RY-1)
KEY UNIT
CONTROL UNIT
HOOD FAN MOTOR
HOOD HERMAL CUT-OUT
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 button 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 140ûF (60ûC) 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 button is pressed.
Hood fan motor does not rotate at all with touched FAN button.
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
operate.)
Oven does not go into cook cycle when START button 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 10 (PHI) mode.
Function of DEFROST CENTER does not operate properly.
Oven goes into DEFROST CENTER but food is not defrosted well.
CK = Check / RE = Replace
MICROWAVE
COOKING
CONDITION
MONITOR SWITCH
SECONDARY INTERLOCK SYSTEM
PRIMARY INTERLOCK SWITCH
TEMPERATURE FUSE OR THERMAL CUT-OUT
HIGH VOLTAGE CAPACITOR
H.V. RECTIFIER
12
IDLE
CONDITION
H
G
F
E
D
C
OFF
CONDITION
PROBLEM
POWER TRANSFORMER
MAGNETRON
POSSIBLE CASE AND
DEFECTIVE PARTS
CONDITION
B
A
TEST PROCEDURE
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TEST PROCEDURES
PROCEDURE
LETTER
A
COMPONENT TEST
MAGNETRON ASSEMBLY TEST
1.
2.
3.
4.
5.
6.
7.
8.
9.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check
across the magnetron filament leads should indicate less than 1 ohm.
To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads
and chassis ground. This test should indicate an infinite resistance. If there is little or no resistance
the magnetron is grounded and must be replaced.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
MICROWAVE OUTPUT POWER
The following test procedure should be carried out with the microwave oven in a fully assembled condition
(outer case fitted).
HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE
OBSERVED.
Power output of the magnetron can be measured by performing a water temperature rise test. This test
should only be used if above tests do not indicate a faulty magnetron and there is no defect in the following
components or wiring: silicon rectifier, high voltage capacitor and power transformer. This test will require
a 16 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple type
temperature tester. For accurate results, the following procedure must be followed carefully:
1. Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water with
a thermometer or thermocouple temperature tester. Stir the thermometer or thermocouple through the
water until the temperature stabilizes. Record the temperature of the water.
2. Place the cup of water in the oven. Operate oven at 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 29.2
to 54.2½F(16.2 to 30.1½C) rise in temperature. If the water temperatures are accurately measured and
tested for the required time period the test results will indicate if the magnetron tube has low power output
(low rise in water temperature) which would extend cooking time or high power output (high rise in water
temperature) which would reduce cooking time. Because cooking time can be adjusted to compensate
for power output, the magnetron tube assembly should be replaced only if the water temperature rise
test indicates a power output well beyond the normal limits. The test is only accurate if the power supply
line voltage is 120 volts and the oven cavity is clean.
B
POWER TRANSFORMER TEST
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Disconnect the primary input terminals and measure the resistance of the transformer with an
ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of
the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be
approximately 83 ohms; the resistance of the filament coil should be less than 1 ohm.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)
C
HIGH VOLTAGE RECTIFIER TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across
the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading. If a
short is indicated in both directions, or if an infinite resistance is read in both directions, the rectifier
is probably defective and should be replaced.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts.
D
HIGH VOLTAGE CAPACITOR TEST
1.
2.
3.
4.
5.
6.
7.
8.
E
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and
check for short or open between the terminals using an ohmmeter.
Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate continuity
for a short time and should indicate an open circuit once the capacitor is charged. If the above is not
the case, check the capacitor with an ohmmeter to see if it is shorted between either of the terminals
and case. If it is shorted, replace the capacitor.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
CAVITY THERMAL CUT-OUT TEST
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the
temperature of the thermal cut-out reaches approximately 293½F(145½C).
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.
Discharge high voltage capacitor.
A continuity check across the temperature fuse terminals should indicate a closed circuit. If the
temperature of the magnetron reaches approximately 302½F(150½C), 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.
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
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.
F
PRIMARY INTERLOCK 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.
Discharge high voltage capacitor.
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicate an open circuit with the door open and a closed circuit with
the door closed. If improper operation is indicated, replace the secondary interlock switch.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
SECONDARY INTERLOCK SYSTEM TEST
DOOR SENSING SWITCH
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal
of the switch. The meter should indicate an open circuit with the door open and a closed circuit with
the door closed. If improper operation is indicated, replace the door sensing switch.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
NOTE: If the door sensing switch contacts fail in the open position and the door is closed, the cooling fan
motor, stirrer motor and oven light will be activated by RY1.
SECONDARY INTERLOCK RELAY (RY2)
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect two (2) wire leads from the male tab terminals of the Secondary Interlock Relay. Check the
state of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay contacts
are closed, replace the circuit board entirely or the relay itself.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
H
MONITOR SWITCH TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Before performing this test, make sure that the primary interlock switch and the secondary interlock
relay are operating properly, according to the above Switch and Interlock system Test Procedures.
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
15
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
5.
6.
7.
8.
plate of the oven cavity with the door opened (in this condition the plunger of the monitor switch is pushed
in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be
defective. After testing the monitor switch, reconnect the wire lead to the monitor switch (COM) terminal
and check the continuity of the monitor circuit.
Reconnect all leads removed from
components during testing.
Red
White/ White
Reinstall the outer case (cabinet).
Reconnect the power supply cord after
the outer case is installed.
Screw Driver
Run the oven and check all functions.
Ohmmeter
Primary
Interlock Switch
I
Monitor Switch
BLOWN MONITOR FUSE TEST
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
If the monitor fuse is blown when the door is opened, check the secondary interlock relay, primary
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 SECONDARY INTERLOCK
RELAY, PRIMARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND MONITOR
SWITCH FOR PROPER OPERATION.
If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must
be replaced with "monitor fuse and monitor switch assembly" part number FFS-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.
J
HOOD THERMAL CUT-OUT TEST
1.
2.
3.
4.
5.
6.
7.
8.
K
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
A continuity check across the thermal cut-out terminals should indicate an open circuit unless the
temperature of the thermal cut-out reaches approximately 140½F(60½C) or more. At that temperature,
the contacts will close. The thermal cut-out opens automatically at approximately 113½F(45½C).
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.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
If the motor does not turn, touch the FAN button once 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:
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
YLW
Resistance between;
BLU
1
4
HOOD FAN
CAPACITOR
MAIN
SUB
5
120 v
60 Hz
60 Ω
5.
6.
7.
8.
AND
AND
AND
AND
AND
AND
YLW (4) =
YLW (4) =
BLK (2) =
BLU (1) =
BLK (2) =
RED (5) =
0 Ω (Shorted)
60Ω
60Ω
162Ω
102Ω
162Ω
2
BLK
102 Ω
RED
BLU (1)
BLK (2)
BLU (1)
RED(5)
RED(5)
YLW(4)
6-PIN CONNECTOR
OF HOOD FAN MOTOR
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.
17
BLU BLK
1
2
4
5
YLW RED
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TEST PROCEDURES
PROCEDURE
LETTER
L
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. Refer to procedure of " HOOD
EXHAUST LOUVER REMOVAL ", " 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) screws holding the hood intake duct R to the ovencavity top plate and the base plate
R. And remove the hood intake duct R.
5) Disconnect the leads to the primary of the power transformer.
6) 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 hood intake duct R with two (2) screws.
4) Re-install the outer case (cabinet).
5) Reconnect the power supply cord after the outer case is installed.
6) 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 M) to determine if control unit is faulty.
2-1 In connection with pads.
a) When touching the pads, a certain group of pads do not produce a signal.
b) When touching the pads, no pads produce a signal.
2-2 In connection with indicators
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light up; or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
2-3 Other possible problems caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
When testing is completed,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) To discharge high voltage capacitor, wait for 60 seconds.
4) Reconnect all leads removed from components during testing.
5) Re-install the hood intake duct R.
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.
M
KEY UNIT TEST
1.
2.
3.
4.
5.
6.
7.
8.
9.
Disconnect the power supply cord.
Open the door and block it open.
To discharge high voltage capacitor, wait for 60 seconds.
Remove the control panel assembly.
If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable
is making good contact, verify that the door sensing switch (stop switch) operates properly; that is the
contacts are closed when the door is closed and open when the door is open. If the door sensing switch
(stop switch) is good, disconnect the flat ribbon cable that connects the key unit to the control unit and
make sure the door sensing switch is closed (either close the door or short the door sensing switch
connecter). Use the Key unit matrix indicated on the control panel schematic and place a jumper wire
between the pins that correspond to the STOP/CLEAR pad making momentary contact. If the control
unit responds by clearing with a beep the key unit is faulty and must be replaced. If the control unit does
not respond, it is faulty and must be replaced. If a specific pad does not respond, the above method
may be used (after clearing the control unit) to determine if the control unit or key pad is at fault.
Reconnect all leads removed from components during testing.
Re-install the control panel assembly.
Reconnect the power supply cord.
Run the oven and check all functions.
G12 G11 G10
G9
G8
G7
G6
REHEAT
G5
G4
G3
G2
G1
2
POPCORN
3
LIGHT
COOK
4
5
6
FAN
DEFROST
7
8
9
STOP
CLEAR
1
POWER
LEVEL
0
TIMER
CLOCK
START
MINUTE
PLUS
KEY UNIT
N
RELAY TEST
1. Disconnect the power supply cord, and then remove outer case. Refer to procedure of " HOOD
EXHAUST LOUVER REMOVAL ", " 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 intake duct R.
5. Disconnect the leads to the primary of the power transformer.
6. Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
19
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
7. After that procedure, re-connect the power supply cord.
8. Check voltage between normal open terminal of the relay RY2 and the normal open terminal of the relay
RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1, RY2, RY4, and RY5 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated .................... Defective relay.
DC. voltage not indicated .............. Check diode which is connected to the relay coil. If diode
is good, control unit is defective.
RELAY SYMBOL
RY1
RY2(COOK)
RY4
RY5
OPERATIONAL VOLTAGE
Approx. 26.6V D.C.
Approx. 26.0V D.C.
Approx. 26.6V D.C.
Approx. 26.6V D.C.
CONNECTED COMPONENTS
Oven lamp / Fan motor / Turntable motor
Power transformer
Hood motor
Hood lamp
9. Disconnect the power supply cord.
10. Open the door and block it open.
11. To discharge high voltage capacitor, wait for 60 seconds.
12. Reconnect all leads removed from components during testing.
13. Re-install the hood intake duct R.
14. Re-install the outer case (cabinet).
15. Reconnect the power supply cord after the outer case is installed.
16. Run the oven and check all functions.
O
DEFROST CENTER TEST
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Open the door.
Place one cup of water in the center of the turntable tray in the oven cavity.
Close the door.
Touch the " DEFROST" pad once.
Touch the number pad "2".
Touch the number pad "5".
Touch the " START " button.
The oven is in Defrost center cooking condition.
The oven will operate as follows.
Menu
1ST STAGE
Steaks/Chops LEVEL
TIME
0.5lbs
60%
57sec.
2ND STAGE
LEVEL
TIME
40%
17sec.
(8) If improper operation is indicated, the control unit is probably defective and should be checked.
P
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.
2) Open the door and block it open.
3) To discharge high voltage capacitor, wait for 60 seconds.
4) Remove the control unit, referring to the procedure of " CONTROL PANEL ASSEMBLY, CONTROL
UNIT AND KEY UNIT REMOVAL ".
5) Follow the troubleshooting guide given below for repair.
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TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
STEPS
OCCURRENCE
CAUSE OR CORRECTION
1
Only pattern at "a" is broken.
*Insert jumper wire J1 and solder.
2
Pattern at "a" and "b" are broken.
*Insert the coil RCILF2003YAZZ between "c" and "d".
1
VRS1
d
J1
P
S
b a
3
T1
c
RY2
QKITPB035
6) 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 215ý ± 10%). If any abnormal
condition is detected, replace the defective
parts.
7) Reconnect all leads removed from components during testing.
8) Re-install the control unit to the control panel and re-install the control panel to the oven.
9) Reconnect the power supply cord.
10) 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. Refer to procedure of " HOOD
EXHAUST LOUVER REMOVAL ", " 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 intake duct R.
5) Disconnect the leads to the primary of the power transformer.
6) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
7) After that procedure, re-connect the power supply cord.
8) Follow the troubleshooting guide given below for repair.
STEPS
1
2
9)
10)
11)
12)
13)
14)
15)
16)
OCCURRENCE
CAUSE OR CORRECTION
The rated AC voltage is not present between
the normal open terminal of the relay RY2 and
the normal open terminal of the relay RY1.
Check supply voltage and oven power cord.
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.
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 hood intake duct R.
Re-install the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
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TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
The touch control section consists of the following units
as shown in the touch control panel circuit.
Symbol
VC
(1) Key Unit
(2) Control Unit (The Control unit consists of LSI Unit and
Power U nit)
Voltage
-5.3V
Application
LSI(IC1)
3) Synchronizing Signal Circuit
The power source synchronizing signal is available in order
to compose a basic standard time in the clock circuit. It
incorporates a very small error because it works on
commercial frequency.
The principal functions of these units and the signals communicated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals generated in the
LSI are sent to the key unit through P20, P21, P22, P25, and
P26.
When a key pad is touched, a signal is completed through the
key unit and passed back to the LSI through P43, P44, P45
and P46 to perform the function that was requested.
4) Reset Circuit
A circuit to generate a signals which resetting the LSI to the
initial state when power is applied.
Control Unit
Control unit consists of LSI, power source circuit, synchronizing signal circuit, reset circuit, buzzer circuit, relay circuit
indicator circuit and back light circuit.
6) Door Sensing Switch
A switch to inform the LSI if the door is open or closed.
5) Buzzer Circuit
The buzzer is responds to signals from the LSI to emit
audible sounds (key touch sound and completion sound).
7) Relay Circuit
To drive the magnetron, fan motor, turntable motor, hood
motor, and light the oven lamp and hood lamp.
1) LSI
This LSI controls the key strobe signal, relay driving signal
for oven function and indicator signal.
8) Indicator Circuit
This circuit consists of 22 segments and 3 common
electrodes using a Light Crystal Display.
2) Power Source Circuit
This circuit generates voltages necessary for the control
unit from the AC line voltage.
In addition, the synchronizing signal is available in order to
compose a basic standard time in the clock circuit.
9) Back Light Circuit
A circuit to drive the back light (Light emitting diodes LD1LD4).
DESCRIPTION OF LSI
LSI
The I/O signal of the LSI is detailed in the following table.
Pin No.
Signal
I/O
1-2
VL2-VL1
IN
3-6
AN7-AN4
IN
Description
Power source voltage input terminal.
Standard voltage for LCD.
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.
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Pin No.
7
8
9-10
11-13
14
Signal
I/O
AN3
AN2
OUT
IN
AN1-AN0
P57-P55
CNTR0
OUT
OUT
OUT
Description
Back light circuit (Light emitting diodes) driving signal.
To input signal which communicates the door open/close information to LSI.
Door close "H" level signal (0V). Door open "L" level signal (-5V).
Terminal not used.
Terminal not used.
0.1 sec.
Signal to sound buzzer (2.0 kHz).
H : GND
A: key touch sound.
A
L : -5V
B: Completion sound.
2.0 sec.
H : GND
B
L : -5V
15
16
P53
OUT
Terminal not used.
P52
OUT
Oven lamp, fan motor and turntable motor driving signal
16.7 msec.
To turn on and off shut off relay (RY1). The
square waveform voltage is delivered to the
RY1 driving circuit and RY2 control circuit.
H : GND
L : -5V
During cooking
17-18
19
P51-P50
P47
OUT
OUT
Terminal not used.
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). The
signals holds "L" level during microwave cooking and "H" level while not cooking. In other
cooking modes (variable cooking) the signal
turns to "H" level and "L" level in repetition
according to the power level.
OFF
Maximum
output
H : GND
ON
OFF
70% of
maximum
output
OFF
24 sec.
ON
8 sec.
L : -5V
H : GND
L : -5V
(ON and OFF times for other power level.)
20
P46
IN
21
P45
IN
22
P44
IN
23
P43
IN
24
INT0
IN
Signal coming from touch key.
When either G12 line on key matrix is touched, a corresponding signal out of P20, P21,
P22, P25 and P26 will be input into P46. When no key is touched, the signal is held at
"H" level.
Signal similar to P46.
When either G11 line on key matrix is touched, a corresponding signal will be input into
P45.
Signal similar to P46.
When either G10 line on key matrix is touched, a corresponding signal will be input into
P44.
Signal similar to P46.
When either G9 line on key matrix is touched, a corresponding signal will be input into P43.
Signal synchronized with commercial power source frequency.
H : GND
This is the basic timing for time processing of LSI.
L : -5V
16.7 msec.
25
26
27
P41
P40
RESET
OUT
IN
IN
28-29
30
P71-P70
XIN
OUT
IN
31
XOUT
OUT
32
VSS
IN
33
P27
OUT
Terminal not used.
Connected to GND through the pull-down resistor R100.
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied.
Terminal not used.
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Power source voltage: -5.0V.
VC voltage of power source circuit input.
Terminal not used.
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Pin No.
Signal
I/O
34
P26
OUT
35
P25
OUT
36
37
38
P24
P23
P22
OUT
OUT
OUT
39
P21
OUT
40
P20
OUT
41
42
P17
P16
OUT
OUT
43
44
P15
P14
OUT
OUT
45-47
48-50
51-72
73/74
75
76
77
P13-P11
OUT
SEG24-SEG22 OUT
SEG21-SEG0 OUT
VCC/VREF
AVSS
COM3
COM2
IN
IN
OUT
OUT
78
COM1
OUT
79
COM0
OUT
80
VL3
IN
Description
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G7 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G6 line keys on key matrix is touched.
Terminal not used.
Terminal not used.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G3 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G2 line keys on key matrix is touched.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P43-P46 terminal while one
of G1 line keys on key matrix is touched.
Terminal not used.
Hood lamp driving signal.
H : GND
To turn on and off relay(RY5). " L " level: During
OFF
Hood lamp ON. "H" level: During Hood lamp
L
ON
OFF.
Terminal not used.
Hood motor driving signal.
H : GND
To turn on and off relay(RY4). "L" level: During
OFF
Hood motor ON. "H" level: During Hood motor
L
ON
OFF.
Terminal not used.
Terminal not used.
Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.)
LCD (Pin No.) LSI signal (Pin No.)
LCD (Pin No.)
SEG 21 (51) ------------------- SEG21 ( 1)
SEG 10 (62) -------------------- SEG10 (12)
SEG 20 (52) ------------------- SEG20 ( 2)
SEG 9 (63) --------------------- SEG 9 (13)
SEG 19 (53) ------------------- SEG19 ( 3)
SEG 8 (64) --------------------- SEG 8 (14)
SEG 18 (54) ------------------- SEG18 ( 4)
SEG 7 (65) --------------------- SEG 7 (15)
SEG 17 (55) ------------------- SEG17 ( 5)
SEG 6 (66) --------------------- SEG 6 (16)
SEG 16 (56) ------------------- SEG16 ( 6)
SEG 5 (67) --------------------- SEG 5 (17)
SEG 15 (57) ------------------- SEG15 ( 7)
SEG 4 (68) --------------------- SEG 4 (18)
SEG 14 (58) ------------------- SEG14 ( 8)
SEG 3 (69) --------------------- SEG 3 (19)
SEG 13 (59) ------------------- SEG13 ( 9)
SEG 2 (70) --------------------- SEG 2 (20)
SEG 12 (60) ------------------ SEG12 (10)
SEG 1 (71) --------------------- SEG 1 (21)
SEG 11 (61) ------------------ SEG11 (11)
SEG 0 (72) --------------------- SEG 0 (22)
Connected to GND.
Connected to VC.
Terminal not used.
Common data signal: COM2.
Connected to LCD signal COM2.
Common data signal: COM1.
Connected to LCD signal COM1.
Common data signal: COM0.
Connected to LCD signal COM0.
Power source voltage input terminal.
Standard voltage for LCD.
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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
door sensing switch (on PWB) of the touch control panel
with a jumper, which activates an operational state that is
equivalent to the oven door being closed. As for the
sensor-related controls of the touch control panel, checking
them is possible if dummy resistor(s) with resistance
equal to that of the controls are used.
(2) Servicing the touch control panel with power supply
from an external power source:
Disconnect the touch control panel completely from the
oven proper, and short both ends of the door sensing
switch (on PWB) of the touch control panel, which activates
an operational state that is equivalent to the oven door
being closed. Connect an external power source to the
power input terminal of the touch control panel, then it is
possible to check and repair the controls of the touch
control panel it is also possible to check the sensorrelated controls of the touch control panel by using the
dummy resistor(s).
approx. 1M ohm
2. Shapes of Electronic Components
Transistor
KRC243M
E
CB
3. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the
precautions you must take when doing so. To perform the
servicing, power to the touch control panel is available
either from the power line of the oven itself or from an
external power source.
(1) Servicing the touch control panel with power supply
of the oven:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING AND PRESENTS A HAZARD.
Therefore, before checking the performance of the touch
control panel,
1) Disconnect the power supply cord, and then remove
outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power
transformer.
5) Ensure that these leads remain isolated from other
components and oven chassis by using insulation
tape.
6) After that procedure, re-connect the power supply
cord.
After checking the performance of the touch control panel,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) Re-connect the leads to the primary of the power
transformer.
4. Servicing Tools
Tools required to service the touch control panel assembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a
grounding terminal.)
2) Oscilloscope: Single beam, frequency range: DC10MHz type or more advanced model.
3) Others: Hand tools
5. Other Precautions
1) Before turning on the power source of the control unit,
remove the aluminium foil applied for preventing static
electricity.
2) Connect the connectors of the key unit to the control
unit being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that abnormal
voltage due to static electricity etc. is not applied to the
input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to
PWB, making sure that all connections are tight.
5) Be sure to use specified components where high
precision is required.
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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)
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
WARNING:
Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
1. Disconnect the power supply cord.
2. Make sure that a definite” click” can be heard when the
microwave oven door is unlatched. (Hold the door in a
closed position with one hand, then push the door open
button with the other, this causes the latch leads to rise,
it is then possible to hear a “click’ as the door switches
operate.)
3. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
1.
2.
3.
4.
5.
6.
Door does not close firmly.
Door hinge, support or latch hook is damaged.
The door gasket or seal is damaged.
The door is bent or warped.
There are defective parts in the door interlock system.
There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
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.
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
WARNING FOR WIRING
To prevent an electric shock, take the following precautions.
1. Before wiring,
1) Disconnect the power supply cord.
2) Open the door block it open.
3) Discharge the high voltage capacitor and wait for 60
seconds.
2. Don’t let the wire leads touch to the followiong parts;
1) High voltage parts:
Magnetron, High voltage transformer, High voltage
capacitor and High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, High voltage transformer
and Oven cavity.
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, Open lever, Open
button.
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, grease filter and charcoal filter.
2. Base cover and hood lamp glass assembly.
3. Turntable motor.
4. Hood exhaust louver.
5. Control panel assembly or components.
HOOD EXHAUST LOUVER REMOVAL
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood exhaust
louver to the oven cavity front face plate.
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5. Pull the hood exhaust louver from the oven cavity by
pushing the right and left tabs of the hood exhaust louver
to remove.
6. Now, the hood exhaust louver is free.
Left tab
Hood exhaust louver
Screw
Screw
Right tab
Screw
REMOVAL OF OVEN FROM WALL (Two persons recommended to remove the oven)
1. Disconnect the power supply cord, and uncoil the power
supply cord.
2. To discharge the high voltage capacitor, wait for 60
seconds.
3. Remove the turntable tray and support from the oven cavity.
4. If the exhaust damper assembly is installed, remove the
one (1) screw holding the exhaust damper assembly to
the rear stay, and remove the exhaust damper assembly
by sliding it backward.
5. Remove the two (2) screws holding the oven (outer case
cabinet) to the top cabinet.
6. While supporting the front of the oven, pull down the two
(2) mounting levers and release the oven from the unit
mounting plate.
7. Pull the power cord out of the wall cabinet and remove
the oven.
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
supply cord from the wiring harness and remove the
power supply cord together with the outer case.
8. Nip the cord bushing with bushing pliers and release it
from the outer case cabinet.
9. Remove the cord bushing and the power supply cord
from the outer case cabinet.
10.Now, the power supply cord is free.
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, referring to "REMOVAL OF
OVEN FROM WALL" and proceed as follows;
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove four (4) screws holding the rear stay to the hood
fan motor or the oven, and remove it.
5. Remove the six (6) screws from the rear of the outer case
cabinet and one (1) screw at front.
6. Slide the outer case cabinet back about 1 inch (3 cm) to
free it from retaining clips on the cavity face plate.
7. Disconnect the three (3) pin connector of the power
POWER TRANSFORMER REMOVAL
Re-install
1. Install by sliding the transformer on the base plate R with
its primary terminals toward the outer case.
2. Secure the transformer with two (2) screws to base plate
R.
3. Re-connect wire leads (primary and high voltage) to the
transformer and filament leads of transformer to
magnetron and high voltage capacitor. Refer to
"PICTORIAL DIAGRAM".
4. Re-install the hood intake duct R to the oven cavity top
plate, the oven cavity front flange and the fan duct with
three (3) screws.
5. 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 the high voltage capacitor, wait for 60
seconds.
4. Remove three (3) screws holding the hood intake duct R
to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Disconnect main wire harness from transformer.
6. Disconnect high voltage wire A from the transformer.
7. Disconnect filament leads of transformer from the
magnetron and capacitor.
8. Remove two (2) screws holding the transformer to base
plate R.
HOOD FAN MOTOR 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 the high voltage capacitor, wait for 60
seconds.
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4. Disconnect the 6-pin connector of the hood fan motor
from the main wire harness located at the right edge of
the oven cavity top plate and release the snap band from
the hood duct.
5. Remove the hood fan motor from the oven cavity top
plate by lifting it up.
6. Now, the hood fan motor is free.
MAGNETRON 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 the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Disconnect the high voltage wire lead of the high
voltage rectifier assembly from the magnetron.
6. Disconnect the filament lead of the transformer from the
magnetron.
7. Remove the one (1) screw holding the hood duct R to the
oven cavity top plate. And remove the hood duct R from
the oven cavity top plate R.
8. Remove the magnetron duct from the oven cavity, by
releasing the tab of the magnetron duct from the oven
cavity top plate.
9. Carefully remove four (4) mounting screws holding the
magnetron to waveguide. When removing the screws
hold the magnetron to prevent it from falling.
10.Remove the magnetron from the unit with care so the
magnetron tube should not be hit by any metal object
around the tube.
CAUTION: WHEN REPLACING THE MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND
MOUNTING SCREWS ARE TIGHTENED SECURELY.
HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL
8. Remove the fan duct assembly from the oven cavity,
referring to the procedure of "COOLING FAN MOTOR
REMOVAL"
9. Remove one (1) screw holding capacitor holder and high
voltage rectifier to the fan duct.
10.Disconnect the high voltage rectifier assembly from the
high voltage capacitor.
11.Now, the high voltage rectifier assembly is free.
12.Remove capacitor from the holder.
13.Now, the high voltage capacitor is free.
CAUTION: WHEN REPLACING THE HIGH VOLTAGE
RECTIFIER ASSEMBLY, THE GROUND SIDE
TERMINAL MUST BE SECURED FIRMLY
WITH A GROUNDING SCREW.
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 the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Disconnect the high voltage wire lead with high voltage
rectifier from the magnetron.
6. Disconnect filament lead of the transformer from high
voltage capacitor.
7. Disconnect high voltage wire A from capacitor.
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 the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Disconnect the wire leads from the hood fan thermal
cut-out.
6. Remove one (1) screw holding the thermal cut-out to the
flange of base plate R (turntable motor side).
7. Remove the hood fan thermal cut-out from the base plate
R.
8. Now, the hood fan thermal cut-out is free.
THERMAL CUT-OUT (CAVITY) 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 the high voltage capacitor, wait for 60
seconds.
4. Disconnect the wire leads from the thermal cut-out
(cavity).
5. Remove the thermal cut-out (cavity) from the holder at
the oven cavity bottom plate.
6. Now, the thermal cut-out (cavity) is free.
28
R-1405
R-1406
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 the high voltage capacitor, wait for 60
seconds.
4. Remove the fan duct assembly from the oven cavity,
referring to the procedure of " COOLING FAN MOTOR
REMOVAL".
5. Disconnect the wire leads from the temperature fuse
(Magnetron).
6. Remove the one (1) screw holding the temperature fuse
(Magnetron) to the fan duct.
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 the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Remove the one (1) screw holding the hood duct R to the
oven cavity top plate. And remove the hood duct R.
6. Disconnect the wire leads from the fan motor.
7. Disconnect the high voltage wire lead with the high
voltage rectifier from the magnetron.
8. Disconnect the filament lead of the transformer from the
high voltage capacitor.
9. Disconnect the high voltage wire A from the capacitor.
10.Release the wire leads from the hole of the fan duct.
11.Remove two (2) screws holding the fan duct to oven
cavity top plate and the base plate R.
12. Remove the fan duct assembly from the oven cavity.
13.Remove the fan blade from the fan motor shaft according
the following procedure.
14.Hold the edge of the rotor of the fan motor by using a pair
of groove joint pliers.
CAUTION:
* Make sure that any pieces do not enter the gap
between the rotor and the stator of the fan motor
because the rotor is easily shaven by pliers and
metal pieces may be produced.
* Do not touch the pliers to the coil of the fan motor
because the coil may be cut or damaged.
* Do not disfigure the bracket by touching with the
pliers.
15.Remove the fan blade from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.
16. 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.
17.Remove the two (2) screws holding the fan motor to the
fan duct.
18.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. 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.
4. Install the fan motor to the hood duct with the two (2) screws.
CAUTION:
* Do not hit the fan blade with excesive force 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.
5. Install the fan duct to the oven cavity top plate and base
plate R with the two (2) screws.
6. Reconnect the wire leads to the fan motor, magnetron
and high voltage capacitor, referring to the pictorial
diagram.
7. Re-install the wire leads to the hole of the fan duct.
8. Re-install the hood intake duct R to the oven cavity top
plate, the oven cavity front flange and the fan duct with
the three (3) screws.
9. Refer to procedure of "OUTER CASE REMOVAL". And
reverse their procedure. And re-install the outer case.
Rear View
Coil
Shaft
Groove joint pliers
Shaft
Axis
Stator
Gap
Bracket
Rotor
These are the areas
that should be held
with a pliers
Stator
Rotor
Side View
29
Table
Center of
bracket
R-1405
R-1406
TURNTABLE MOTOR AND FOOD LAMP SOCKETS REMOVAL
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the one (1) screw holding the base cover to the
oven cavity back plate.
5. Remove the three (3) screws holding the base cover to
the oven cavity front face plate.
6. Open the base cover.
7. Release the two hood lamp sockets from the base cover.
8. Remove the base cover from the oven cavity by pulling
down and moving to the left slightly.
TURNTABLE MOTOR
9. Disconnect the wire leads from the turntable motor.
10.Remove one (1) screw holding turntable motor to the
oven cavity.
11.Now the turntable motor is free.
HOOD LAMP SOCKET
9. Screw the hood lamp off from the lamp socket.
10.Disconnect the wire leads from the lamp socket by
pushing the terminal hole of the lamp socket with the
small flat type screw driver.
11. Now, the lamp socket is free.
OVEN LAMP AND LAMP SOCKET REMOVAL
1. Disconnect the power supply cord, remove the oven
from the wall and remove the 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 the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Turn the lamp socket and release it from the magnetron
duct.
6. Screw the oven lamp off from the lamp socket.
7. Now, the oven lamp is free.
8. 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.
9. Now, the oven lamp socket is free.
Oven lamp
socket
Terminal
Wire lead
Terminal hole
Flat type small
screw driver
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 the 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
2
®
CAUTION: WHEN CONNECTING THE POSITIVE LOCK
CONNECTORS TO THE TERMINALS, INSTALL THE POSITIVE LOCK® SO THAT THE
LEVER FACES YOU.
Pull down
Positive lock® connector
CONTROL PANEL ASSEMBLY, CONTROL UNIT AND KEY UNIT REMOVAL
6. Remove one (1) screw holding the control panel to the
oven cavity front face plate.
7. Release the control panel from the oven cavity front face
plate by lifting it up.
8. Disconnect the wire leads from the relays RY1 and RY2.
9. Disconnect the connectors CN-A, CN-B and CN-E from
the control unit.
10. Remove the control panel assembly from the oven.
11.Now, the control panel assembly is free.
12.Disconnect the connector CN-G from the control unit.
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove three (3) screws holding the hood exhaust
louver to oven cavity front face plate.
5. 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")
30
R-1405
R-1406
13.Remove the two (2) screws holding the LCD holder to
the key fixing plate.
14.Remove two (2) screws holding the power unit to the key
fixing plate.
15.Release the two (2) tabs holding the power unit to the key
fixing plate.
16.Release the three (3) tabs holding the LCD to the LCD
holder.
17.Release the two (2) tabs holding the LSI unit to the LCD
holder.
18.Remove the LCD holder and the LED sheet.
19.Now, the control unit is free.
20.Remove the one (1) screw holding the key fixing plate to
the control panel.
21.Release the six (6) tabs holding the key fixing plate to the
control panel.
22.Remove the key fixing plate from the control panel.
23.Remove the key unit from the key fixing plate.
24.Now, the key unit is free
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. See key unit location.
4. Stick the key unit firmly to the key fixing plate by rubbing
with soft cloth not to scratch.
Key unit
Key
fixing plate
NOTES FOR KEY UNIT REPLACEMENT
1. Do not reuse the torn key unit because the performance
of the adhesive becomes weak.
Key unit location
DOOR SENSING SWITCH, PRIMARY 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 the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Remove the control panel assembly, referring to the
procedure of "CONTROL PANEL ASSEMBLY ,
CONTROL UNIT AND KEY UNIT REMOVAL".
6. Remove the two (2) screws holding the latch hook to the
oven cavity front flange.
7. Remove the latch hook from the oven cavity front flange.
8. Disconnect the wire leads of each switch.
9. Remove each switch from the latch hook by pushing the
one (1) stopper tab holding each switch.
10.Now, each switch is free.
Re-install
1. Re-install each switch in its place. The primary interlock
switch is in the lower position, door sensing switch is 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".
DOOR SENSING SWITCH, PRIMARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT
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 the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood intake duct
R to the oven cavity top plate, the oven cavity front flange
and the fan duct. And remove the hood intake duct R.
5. Remove the control panel assembly, referring to the
procedure of "CONTROL PANEL ASSEMBLY ,
CONTROL UNIT AND KEY UNIT REMOVAL".
If the door sensing switch, primary interlock switch and
monitor switch do not operate properly due to a
misadjustment, the following adjustment should be made.
6. Loosen the two (2) screws holding latch hook to the oven
cavity front flange.
7. With door closed, adjust latch hook by moving it back and
forth, and up and down. In and out play of the door
allowed by the upper and lower position of the latch hook
should be less than 0.5mm. The vertical position of the
latch hook should be adjusted so that the door sensing
switch and primary interlock switch are activated with the
door closed. The horizontal position of the latch hook
should be adjusted so that the monitor switch is activated
with the door closed.
8. Secure the screws with washers firmly.
9. Check all of the switches operation. If any switch has not
activated with the door closed, loosen screw and adjust
the latch hook position.
31
R-1405
R-1406
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.
2. The door sensing switch and primary interlock switch
interrupt the circuit before the door can be opened.
3. Monitor switch contacts close when door is opened.
4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
Latch heads
Latch hook
Door sensing
switch
Door
Monitor switch
Open lever
Primary interlock switch
Figure C-1. Latch Switch Adjustments
DOOR REPLACEMENT
DOOR ASSEMBLY REMOVAL
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood exhaust
louver to the oven cavity front face plate.
5. 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".)
6. 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.
7. Lift up the door stopper.
8. Now, the door stopper is free from the door assembly.
9. Lift up the door assembly to release the upper and lower
door hinge pins from the upper and lower oven hinges.
10.Now, the door assembly is free.
After any servicing, make sure of the following :
1. Door latch heads smoothly catch latch hook through
latch holes and that latch head goes through center of
latch hole.
2. Deviation of door alignment from horizontal line of cavity
face plate is to be less than 1.0mm.
3. Door is positioned with its face pressed toward cavity
face plate.
4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
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.
Note: When the individual parts are replaced, refer to
"Door Disassembly".
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.
7. Re-install the hood exhaust louver to the oven cavity
front face plate with the three (3) screws.
Note: After any service to the door;
(A) Make sure that door sensing switch and primary
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.
Screw
Upper door
hinge pin
RE-INSTALL
Left tab
Hood exhaust louver
Screw
Upper
oven
hinge
Right tab
Screw
Door assembly
Latch
heads
Lower
oven
hinge
Door stopper
Lower door
hinge pin
RE-INSTALL
Figure C-2. Door Replacement and adjustment
32
R-1405
R-1406
DOOR DISASSEMBLY
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60
seconds.
4. Remove the three (3) screws holding the hood exhaust
louver to the oven cavity front face plate.
5. 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".)
6. Remove door assembly, referring to "DOOR
REPLACEMENT".
Replacement of door components are as follows:
7. 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.
DOOR FRAME ASSEMBLY
11.Remove two (2) screws holding the door panel to the
door frame assembly.
12.Release the door panel from the door frame assembly.
NOTE: It is easier to release the engaging parts of the upper
or lower door hinge pin side at first.
13.Now, door frame assembly is free.
LATCH SPRING, LATCH HEAD AND DOOR PANEL
14.Release the latch spring from the tab of the latch head
and tab of the door frame.
15.Release the latch head from the door frame.
16.Now, the latch spring and latch head are free.
A
Door stopper
Choke cover
CHOKE COVER
8. 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.
9. Pry the choke cover by inserting a putty knife in order
shown in Figure C-3.
10.Now choke cover is free from door panel and door frame.
NOTE: When carrying out any repair to the door, do not
bend or warp the slit choke (tabs on the door
panel assembly) to prevent microwave leakage.
Putty knife
Door frame
Figure C-3. Door Disassembly
33
1
GRY
2
WHT
R
E
D
RED
ORG
COM.
T1
1
2
CN-E
1
C100
CN-B
9
1
3
34
CN-A
5
1
RY2: SECONDARY INTERLOCK RELAY
RY2:
N.O.
N.O.
COM.
CN-C
CN-B
F
4
N.O.
COM.
WHT
5
BRN
PPL
ORG
GRN
BRN
WHT
HOOD LAMP &
SOCKET
BRN
WHT
Blue Marking
WHT
WHT
RED
BRN
BLK
FAN
MOTOR
RED
WHT
MAGNETRON
TEMPERATURE
FUSE
RED
POWER
TRANSFORMER
MAGNETRON
HIGH VOLTAGE
RECTIFIER
HIGH VOLTAGE
CAPACITOR
HIGH VOLTAGE
WIRE A
HIGH VOLTAGE COMPONENTS
OVEN LAMP &
SOCKET
GRY
ORG
RED
CAVITY
THERMAL
CUT-OUT
Blue
Marking
RED
Power Supply
cord 120V 60Hz
5
Figure S-1. Pictorial Diagram
HOOD LAMP &
SOCKET
WHT
BRN
WHT
to Base Plate Right
GRN
GRN
HOOD FAN
THERMAL
CUT-OUT
BLK
BLK
TURNTABLE
MOTOR
RED
HOOD FAN MOTOR
2 WHT
BLU
GRN 1 GRN
3 BLK
4
GRY
WHT
WHT
WHT
RED
2 BLK
1 BLU
BLK
WHT
A
COM.
MONITOR
SWITCH
N.C.
RED
FUSE &
HOLDER
BLU
BLK
YLW 4 YLW
3
3
PRIMARY
INTERLOCK
SWITCH
1 BRN
2
3 BLK
5
PPL
YLW
2
3
4
CN-A
RED
1
BLK
ORG
D
BLK
WHT
RY1
14
CN-C
DOOR SENSING SWITCH
GRN
C
CN-G
2 GRN
1 RED
COM.
6
RED 5 RED
B
GRY
G
CONTROL UNIT
CN-E
RED
E
2
RY4
1
RY5
N.O.
R-1405
R-1406
6
A
B
C
H
6
D
E
F
G
H
R-1405
R-1406
2
1
4
3
6
5
A
A
B
B
D1-D4
1N4002
D4
5
D2
(J1)
C
1
D1
+
–
C2 1000µ/35v
D3
d
a
8
JVR-10S471J
VRS1
3
C1 0.1µ/50v
T1
R1 390 2w
R2 750 1w
b
–
c
D21
1SS270A
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
COM
SP1
PKM22EPT
COM
MICRO.
B3
HOOD MOTOR
COM.
A5
B1
RY5
CN-B
C100
7µ/230v
A3
MOTOR RUN
CAPACITOR
A1
D40
1SS270A
CN-A
DOOR
SENSING
SWITCH
NOTE
: IF NOT SPECIFIED, 1/4W ± 5%
G
E1
HOOD LAMP
VA
C5
INT
C12
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
C4
BUZZER
C11
MICRO.
C10
N.C.
C9
HOOD MOTOR
COM.
C2
VR
C8
HOOD LAMP
C6
N.C.
C13
Q22
C14
DOOR
SENSING
SWITCH
C
D20
1SS270A
E2
F
C3
RY4
D25
1SS270A
E
D24
1SS270A
RY2
HOOD
THERMAL
CUT-OUT
VC
+
Q21
KRC243M
RY1
N.O
AC(H)
C7
C21
10µ/35v
D22
1SS270A
D
N.O
GND
R30 3.3k
AC(N)
C1
CN-E
D
E
F
CN-C
14pin
WIRE HARNESS
G
H
H
Figure S-2. Power Unit Circuit
1
2
4
3
35
5
6
R-1405
R-1406
R13
4.7k
R14
4.7k
COOK
1
COM0(LCD)
COM1(LCD)
COM2(LCD)
26
DEFROST
COM0
COM1
COM2
NC
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
3.6k
4.7k
GND
R15 4.7k
10k
(J16)
4.7k
10k
(J14)
(J15)
(J17)
(J12)
C12
0.1µ/50v
R5 4.7k
R4 82
C11 0.1µ/50v
C10 47µ/16v
4.7k
C4
(J13)
BUZZER
(J10)
C6
4.7k
N.C.
(J11)
C3
C14
0.01µ
/25v
VA
R11
15k
C8
UDZ4.3B R10
1k
HOOD
LAMP
ZD10
C9
C13
0.01µ/25v
H. MOTOR
COM.
R12
15k
C10
Q10
2SA1037AK
NO.
LBS.
CUPS.
KGOZ.
SENSOR AUTO %
1
N.C.
R6 4.7k
Q2
KTA1661
A
C2
Q11
DTA143EKA
COM0(LCD)
COM1(LCD)
COM2(LCD)
2
2
VR
B
–
C7
LIQUID CRYSTAL DISPLAY
CPU UNIT
+
VC
C
C1
D
C5
E
F
G
H
1
INT
GND
80
G
1
Q25 DTA143EAK
LD1 LD2 LD3 LD4
3
DOOR
SENSING
SWITCH
C14
R40 4.7k
C40 0.01µ/25v
25
G
40
I
CF1
CSTS4.00MG03
R41 15k
NOTE :
R71 15k
4
Q22 DTA143EAK
: IF NOT SPECIFIED, 1/16W ± 5%
R80
1M
C13
R100
4.7k
Q22
Q21 DTA143EAK
IC1
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
R68 15k
C11
R69 15k
MICRO.
C20 0.1µ/50v
64
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
P11
P12
P13
P14
P15
P16
P17
41
4
C12
Q30 DTA143EAK
R70 15k
36
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
65
3
VL2
VL1
AN7
AN6
AN5
AN4
AN3
AN2
AN1
AN0
P57
P56
P55
CNTR0
P53
P52
P51
P50
P47
P46
P45
P44
P43
INT0
24
P41
P40
RESET
P71
P70
XIN
XOUT
VSS
P27
P26
P25
P24
P23
P22
P21
P20
Q24 DTA143EAK
VL2
COM0
COM1
COM2
COM3
AVSS
VREF
VCC
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
I
R73 270k
R74 270k
R75 270k
G6
G9
R72 270k
G7
REHEAT
G12 G11 G10
G8
C63 330p/50v
COOK
R60
15k
G2
G1
2
POPCORN
3
LIGHT
4
5
6
FAN
8
9
STOP
CLEAR
0
TIMER
CLOCK
START
MINUTE
PLUS
7
1
POWER
LEVEL
G4
R61
15k
G3
DEFROST
G5
5
5
C62 330p/50v
R62
15k
C61 330p/50v
R65
15k
R66
15k
C60 330p/50v
KEY UNIT
6
6
Figure S-3. LSI Unit Circuit
A
B
C
D
E
F
G
H
R-1405
R-1406
2
1
4
3
6
5
A
A
CN-C
14
D40
D20
B
D21
1
DIP
2
R2
E
R
CN-E
Q1
B
ZD1
R3
R30
C
2
SP1
RY1
0 RM 5 3 0 B F
0 V 4 9 A 7 2 M SCM
1
B
R1
C2
C
C21
B
C3
1
C1
D1
D3
D4
D2
1
VRS1
D
Q21
T1
BFB
E
D
5
J1
P
S
RY2
E
3
8
RY5
D25
D26
D22
F
F
D24
D23
RY4
RY3
9
1
RY6
LOT NO.
G
C100
QKITPB035MRE0
E
5
1
G
CN-A
CN-B
H
H
Figure S-4. Printed Wiring Board
1
2
4
3
37
5
6
R-1405
R-1406
PARTS LIST
∆” may cause undue microwave exposure.
Note: The parts marked “∆
The parts marked “*” are used in voltage more than 250V.
REF. NO.
PART NO.
§
"§" MARK: PARTS DELIVERY SECTION
DESCRIPTION
Q'TY CODE
ELECTRIC PARTS
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
FH-DZB016MRY0
RC-QZA234WRE0
QFS-TA013WRE0
RMOTDA211WRE0
RTHM-A070WRE0
RTHM-0044MRE0
RTRN-B076MRE0
RV-MZA288WRE0
QFSHDB003MRE0
QSW-MA085WRE0
FFS-BA016/KIT
FACCDB011MRE0
QSOCLB006MRE0
FMOTEA469WRKZ
RMOTEB031MRE0
RLMPTA068WRE0
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
High voltage rectifier assembly
High voltage capacitor
Temperature fuse 150½C (Magnetron)
Turntable motor
Thermal cut-out 145½C (Cavity)
Thermal cut-out N.O. 60½C (Hood Fan)
Power transformer
Magnetron
Fuse holder
Primary interlock and door sensing switches
Monitor switch (V-16G-2C25) with fuse (20A) assembly
Power supply cord
Oven lamp socket
Hood fan motor
Fan motor
Oven lamp
1
1
1
1
1
1
1
1
1
2
1
1
3
1
1
3
AH
AP
AE
AL
AF
AH
AY
BK
AD
AE
AF
AQ
AE
BA
AT
AE
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AE
AQ
AQ
AG
AL
AL
AZ
AZ
AB
AN
AM
AG
AG
AH
AV
AV
1
1
1
1
1
1
1
1
1
4
3
2
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
BE
AA
AA
AB
AB
AB
AF
AB
AK
AD
AA
AA
AA
AB
AB
AB
AA
AG
AG
AG
AS
AE
AC
AR
AX
AX
AQ
AQ
AE
CABINET PARTS
2- 1
2- 2
2- 2
2- 3
2- 4
2- 4
2- 5
2- 5
2- 6
2- 7
2- 7
2-7-1
2-7-1
2-7-2
2- 8
2- 8
LSTY-B026MRP0
PDIF-B030MRF0
PDIF-B031MRF0
GDAI-B065MRP0A
HDECQB027MRF0
HDECQB028MRF0
GCABUB103MRP0
GCABUB105MRP0
TMAPCB074MRR0
FANGKB009MRY0
FANGKB010MRY0
LANGQB016MRP0
LANGQB020MRP0
PGLSPB004MRE0
PCOVPB096MRT0
PCOVPB097MRT0
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
Rear stay
Hood exhaust louver [R-1405]
Hood exhaust louver [R-1406]
Base plate R
Front panel L [R-1405]
Front panel L [R-1406]
Outer case cabinet [R-1405]
Outer case cabinet [R-1406]
Schematic diagram
Hood lamp glass assembly [R-1405]
Hood lamp glass assembly [R-1406]
Hood lamp glass angle [R-1405]
Hood lamp glass angle [R-1406]
Hood lamp glass
Base cover [R-1405]
Base cover [R-1406]
3- 1
3- 1A
3- 1B
3- 1C
3- 1D
C1
C2
C21
C100
D1-4
D20-22
D24-25
D40
Q21
R1
R2
R30
RY1-2
RY4-5
SP1
T1
VRS1
3- 1-1
3- 1-2
3- 2
3- 2
3- 2-1
3- 2-1
3- 2-2
CPWBFB069MRU0
QCNCMA017JDZZ
QCNCMA431DRE0
QCNCMA275DRE0
FW-VZB189MRE0
RC-KZA087DRE0
VCEAB31VW108M
VCEAB31VW106M
RC-QZB014MRE0
RH-DZA006PRE0
VHD1SS270A/-1
VHD1SS270A/-1
VHD1SS270A/-1
VSKRC243M//-3
VRS-L63DA391J
VRS-B13AA751J
VRD-B12EF332J
RRLY-A113DRE0
RRLY-B004MRE0
RALM-A014DRE0
RTRNPB018MRE0
RH-VZB002MRE0+
LHLD-B018MRF0
PSHEPB023MRE0
FPNLCB424MRK0
FPNLCB425MRK0
FUNTKB368MRE0
FUNTKB367MRE0
JBTN-B140MRF0
M
M
J
J
M
J
J
J
M
J
J
J
J
J
J
J
J
M
M
J
M
M
M
M
M
M
M
M
M
Control unit
3-pin connector CN-A
2-pin connector CN-B
2-pin connector CN-E
Lead wire harness CN-C
Capacitor
0.1 uF
50V
Capacitor
1000 uF
35V
Capacitor
10 uF
35V
Capacitor
7 uF
230V
Diode (1N4002)
Diode (1SS270A)
Diode (1SS270A)
Diode (1SS270A)
Transistor (KRC243M)
Resistor
390 ohm
2W
Resistor
750 ohm
1W
Resistor
3.3k ohm
1/4W
Relay (DU24D1-1PR(M))
Relay (FTR-F3AA024E)
Buzzer (PKM22EPT)
Transformer
Varistor (JVR-10S471J)
LCD holder
LED sheet
Control panel sub. assembly [R-1405]
Control panel sub, assembly [R-1406]
Key unit [R-1405]
Key unit [R-1406]
Open button [R-1405]
CONTROL PANEL PARTS
38
R-1405
R-1406
REF. NO.
3- 2-2
3- 2-3
3- 2-3
3- 2-4
3- 3
PART NO.
JBTN-B141MRF0
HPNLCB172MRF0
HPNLCB173MRF0
MSPRTA050WRE0
XEPSD30P10XS0
§
M
M
M
M
M
DESCRIPTION
Open button [R-1406]
Control panel frame [R-1405]
Control panel frame [R-1406]
Button spring
Screw; 3mm x 10mm
LSTPPB038MRF0
FROLPB025MRK0
NTNT-A108WRE0
LBNDKB009MRP0
PDUC-B111MRF0
MLEVPB016MRF0
*************
PPACGB014MRF0
PHOK-B018MRF0
FANGTB005MRY0
NFANPB006MRE0
LBSHC0037WRE0
MLEVFB007MRP0
PDUC-B112MRP0
PCOVPB085MRP0
MSPRTA046WRE0
LANGTB055MRP0
PDUC-B115MRF0
PDUC-B114MRF0
PDUC-B113MRP0
PDUC-B117MRF0
PCUSGB043MRP0
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
M
Door stopper
Turntable support assembly
Turntable tray
Capacitor holder
Magnetron duct
Open lever
Oven cavity (Not replaceable part)
Turntable motor packing
Latch hook
Unit mounting plate assembly
Fan blade
Cord bushing
Mounting lever
Hood intake duct R
Waveguide cover
Latch spring
Chassis support
Hood duct R
Hood duct L
Fan duct
Orifice
Transformer cushion
Q'TY CODE
1
AE
1
AT
1
AT
1
AA
5
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
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
2
2
1
1
1
1
1
AB
AN
AM
AB
AF
AD
-AA
AF
AS
AC
AB
AC
AG
AH
AB
AD
AQ
AQ
AH
AC
AC
1
1
1
1
1
1
1
1
1
1
2
BB
BB
AW
AY
AY
AC
AB
AG
AE
AH
AA
1
1
4
1
2
3
6
2
2
1
1
1
1
2
1
1
1
2
1
AH
AC
AC
AB
AA
AA
AA
AA
AD
AD
AB
AT
AT
AA
AA
AB
AT
AF
AH
DOOR PARTS
5
5
5- 1
5- 2
5- 2
5-2-1
5-2-2
5- 3
5- 4
5- 5
5- 6
CDORFB321MRK0
CDORFB322MRK0
FDORFB070MRT0
FCOV-B225MRK0
FCOV-B226MRK0
LSTPPB023MRF0
MSPRTA046WRE0
GCOVHB044MRF0
PSHEPB021MRE0
HPNL-B102MRE0
XCPSD40P08000
M
M
M
M
M
M
M
M
M
M
M
Door assembly [R-1405]
Door assembly [R-1406]
Door panel assembly
Door frame assembly [R-1405]
Door frame assembly [R-1406]
Latch head
Latch spring
Choke cover
Sealer film
Door screen
Screw : 4mm x 8mm
6- 1
6-1-1
6-1-2
6-1-3
6-1-4
6-1-5
6-1-6
6-1-7
6-1-8
6- 2
6- 3
6- 4
6- 5
6- 6
6- 7
6- 8
6- 9
6-10
6-11
CFZK-B460MRK0
LBSHC0040MRE0
LX-BZ0195WRE0
LX-MZB001MRE0
XBRSD50P60000
XOTSD40P12000
XTSSD50P35000
XWHSD50-16300
LANG-B002MRP0
TINSEB318MRK0
TINSKB081MRR0
QW-QZB025MRE0
FW-VZB202MRE0
TCAUAB041MRR0
TCAUAB045MRR0
TCAUAB005MRR0
FW-VZB189MRE0
PFIL-B002MRE0
FFTA-B005MRK0
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
Scale plate
Operation manual
Top template
High voltage wire A
Main harness
DHHS service caution label
Monitor caution label
Revised DHHS/GRD C/label
Low voltage harness
Grease filter
Exhaust damper assembly
MISCELLANEOUS
39
R-1405
R-1406
REF. NO.
PART NO.
§
LX-CZB004MRE0
LX-CZB016MRE0
XOTSE40P12000
XOTSF40P12000
XOTSD40P12000
XHTSD40P08RV0
LX-CZA038WRE0
LX-CZ0052WRE0
XCPSD30P08000
LX-BZA041WRE0
XCBSD30P08000
M
M
M
M
M
M
M
M
M
M
M
DESCRIPTION
Q'TY CODE
SCREWS,NUTS AND WASHERS
77777777777-
1
1
2
2
3
4
5
6
7
8
9
Special
Special
Screw :
Screw :
Screw :
Screw :
Special
Special
Screw :
Special
Screw :
screw
screw
4mm x
4mm x
4mm x
4mm x
screw
screw
4mm x
screw
3mm x
(R-1405)
(R-1406)
12mm (R-1405)
12mm (R-1406)
12mm
8mm
3
3
5
5
18
4
9
2
2
5
1
8mm
8mm
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER
2. REF. NO.
3. PART NO.
4. DESCRIPTION
Order Parts from the authorized SHARP parts Distributor for your area.
Defective parts requiring return should be returned as indicated in the Service Policy.
PACKING AND ACCESSORIES
4-3 TURNTABLE TRAY
TOP PAD
6-10 GREASE FILTER (x 2)
6-3 TOP/WALL TEMPLATE
DOOR PROTECTOR
6-2
OPERATION MANUAL
6-1 INSTALL MATERIAL ASSEMBLY
WRAP COVER
6-11 EXHAUST DAMPER
ASSEMBLY
ACCESSORY PACK
SPADFA020WRE0
DOOR PAD
BOTTOM PAD
Non-replaceable items
PACKING CASE
40
AA
AA
AA
AB
AA
AA
AA
AA
AA
AA
AA
R-1405
R-1406
2
1
4
3
6
5
OVEN AND CABINET PARTS
A
A
6-1-5
6-11
4-10
7-3
2-1
7-3
7-5
B
7-3
2-5
7-3
7-5
4-12
1-12
7-5
4-19
7-5
1-14
C
C
2-6
7-3
7-3
4-17
7-3
4-16
4-18
4-13
D
B
4-17
D
2-4
2-2
7-3
4-7
6-8
7-7
4-16
1-3
7-1
4-15
6-7
E
7-6
4-8
6-6
4-3
1-9
1-4
7-9
4-5
1-16
4-6
F
2-8
1-16
1-10
7-7
7-8
E
7-8
1-13
4-21
1-7
1-11
1-5
4-4
1-1
1-10
1-11
1-2
7-4
4-11
1-8
4-9
1-15
4-20
4-13
4-14
4-22
1-6
F
1-13
7-3
4-2
2-3
7-3
7-3
7-2
7-3
7-3
G
2-7
G
6-10
2-7-2
6-10
2-7-1
7-2
H
H
1
2
4
3
41
5
6
R-1405
R-1406
2
1
4
3
CONTROL PANEL PARTS
5
6
3-3
3-1-2
3-1-1
A
A
3-1
3-2
3-2-1
3-3
3-3
B
B
7-3
DOOR PARTS
3-2-3
3-2-2
3-2-4
C
C
5-3
5
5-1
D
D
5-5
5-6
5-4
E
E
5-2-1
5-2-2
5-2
F
F
MISCELLANEOUS
G
G
6-4
6-1
6-1-1
6-1-4
6-5
6-1-5
6-1-2
6-1-6
6-9
6-1-7
6-1-3
H
Actual wire harness may be different from illustration.
H
6-1-8
1
2
4
3
42
5
6
R-1405
R-1406
NOTES
43
R-1405
R-1406
NOTES
44
R-1405
R-1406
NOTES
45
R-1405
R-1406
COPYRIGHT © 2002 BY SHARP CORPORATION
ALL RIGHTS RESERVED.
No part of this publication may be reproduced, stored
in retrieval systems, or transmitted in any form or by
any means, electronic, mechanical, photocopying,
recording, or otherwise, without prior written permission of the publisher.
'02 SHARP CORP. (9S2.420E) Printed in U.S.A
46