R-1480
R-1481
R-1482
SERVICE MANUAL
S3807R1480X//
OVERTHE RANGE
MICROWAVE OVEN
MODELS
R-1480
R-1481
R-1482
1
2
3
4
5
Coffee/tea
CUSTOM HELP
POPCORN
Roll/muffin, fresh
Roll/muffin, frozen
Hot cereal
BREAKFAST
Scrambled eggs
1
2
3
4
5
Dinner plate
SNACKS
REHEAT
&
Pasta/casserole
Frozen entree
Frozen snack
Pizza, slice
1
2
3
4
5
Baked potatoes
Fresh vegetables
Frozen vegetables
Rice
COMPU DEFROST
COMPU COOK
Ground meat
1
6
2
3
8
4
9
5
0
7
POWER
LEVEL
KITCHEN TIMER
CLOCK
MINUTE
PLUS
TURNTABLE
ON/OFF
STOP
START
CLEAR
TOUCH ON
WORK
LIGHT
NIGHT
LIGHT
FAN
In the interest of user-safety the oven should be restored to its original
HI/LO
condition and only parts identical to those specified should be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens con-
tain circuitry capable of producing very high voltage and
current, contact with following parts may result in a severe,
possibly fatal, electrical shock. (High Voltage Capacitor, High
Voltage Power Transformer, Magnetron, High Voltage Recti-
fier Assembly, High Voltage Harness etc..)
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ...................INSIDE FRONT COVER
BEFORE SERVICING ......................................................................................................INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL................................................................................................................ 1
MICROWAVE MEASUREMENT PROCEDURE ................................................................................................... 2
FOREWORD AND WARNING...............................................................................................................................3
PRODUCT SPECIFICATIONS .............................................................................................................................. 4
GENERAL INFORMATION...................................................................................................................................4
OPERATION ..........................................................................................................................................................6
TROUBLESHOOTING GUIDE ............................................................................................................................ 11
TEST PROCEDURE ............................................................................................................................................ 12
TOUCH CONTROL PANEL ASSEMBLY ............................................................................................................ 21
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 26
PICTORIAL DIAGRAM ........................................................................................................................................34
CONTROL PANEL CIRCUIT ...............................................................................................................................35
PRINTED WIRING BOARD .................................................................................................................................36
PARTS LIST ........................................................................................................................................................37
PACKING AND ACCESSORIES ......................................................................................................................... 42
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
SHARP CORPORATION
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of pro-
ducing very high voltage and current, contact with
following parts may result in a severe, possibly
fatal, electrical shock.
(Example)
HighVoltageCapacitor,HighVoltagePowerTrans-
former, Magnetron, High Voltage Rectifier Assem-
bly, 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.
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
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.
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
7. Run the oven and check all functions.
The high-voltage capacitor remains charged about 60
seconds after the oven has been switched off. Wait for 60
secondsandthenshort-circuittheconnectionofthehigh-
voltage capacitor (that is the connecting lead of the high-
voltage 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.
Microwave ovens should not be run empty. To test for the
presence of microwave energy within a cavity, place a cup
of cold water on the oven turntable, close the door and set
the power to HIGH and set the microwave timer for two (2)
minutes. When the two minutes has elapsed (timer at zero)
carefully check that the water is now hot. If the water
remains cold carry out Before Servicing procedure and re-
examine the connections to the component being tested.
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.
When all service work is completed and the oven is fully
assembled,themicrowavepoweroutputshouldbechecked
and microwave leakage test should be carried out.
1
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven
shouldnotexceed1mW/cm2 atanypoint5cmormorefromtheexternalsurfaceoftheoven, measuredpriortoacquisition
by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external
surface of the oven.
2) Safety interlock switches Primary interlock relay and door sensing switch shall prevent microwave radiation emission in
excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission
in excess of 5 mW/cm2 at any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard
for microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5˚C (68˚F) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)
and made of an electrically nonconductive material such as glass or plastic.
The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage
is measured accurately.
4) Set the cooking control on Full Power Cooking Mode
5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement)
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal
has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed
latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the secondary interlock switch does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.
2
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
SERVICE MANUAL
PRODUCT DESCRIPTION
GENERAL INFORMATION
OPERATION
OVER THE RANGE
MICROWAVE OVEN
R-1480 / R-1481 / R-1482
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-1480, R-1481,
R-1482.
TROUBLESHOOTING GUIDE AND
TEST PROCEDURE
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.
TOUCH CONTROL PANEL
WARNING
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
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.
WIRING DIAGRAM
PARTS LIST
Servicing and repair work must be carried out only by trained service
personnel.
DANGER
Certaininitialpartsareintentionallynotgroundedandpresent
a risk of electrical shock only during servicing. Service
personnel - Do not contact the following parts while the
appliance is energized;
HighVoltageCapacitor,PowerTransformer,Magnetron,High
Voltage Rectifier Assembly, High Voltage Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.
Allthepartsmarked“*”onpartslistareusedatvoltagesmorethan
250V.
Removal of the outer wrap gives access to voltage above 250V.
All the parts marked “∆” on parts list may cause undue microwave
exposure, by themselves, or when they are damaged, loosened
or removed.
SHARP ELECTRONICS CORPORATION
SHARP PLAZA, MAHWAH,
NEW JERSEY 07430-2135
3
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
PRODUCT SPECIFICATION
ITEM
DESCRIPTION
Power Requirements
120 Volts / 14.3 Amperes
60 Hertz
Single phase, 3 wire grounded
Power Output
950 watts (IEC-705 TEST PROCEDURE)
Operating frequency of 2450MHz
Convection Power Output
Case Dimensions
1700 watts
Width 29-15/16"
Height 16-3/8"
Depth 15- 1/4" (Not including the door handle)
Cooking Cavity Dimensions
Width 20-1/4"
Height 8-3/16"
Depth 14-1/2"
1.4 Cubic Feet
Hood lamp
2 bulbs, 30W x 2, Incandescent light bulbs
Approx. 300 C.F.M.
Hood fan
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
CUSTOM HELP pad, BREAKFAST pad, POPCORN pad,
SNACKS & REHEAT pad, COMPU DEFROST pad, COMPU COOK pad,
Number selection pads, POWER LEVEL pad, KITCHEN TIMER / CLOCK pad
MINUTE PLUS pad, TURNTABLE ON / OFF pad, START / TOUCH ON pad
WORK LIGHT pad, NIGHT LIGHT pad, FAN HI / LO pad
Oven Cavity Light
Safety Standard
30W x 1 Incandescent light bulb
UL Listed
FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
Approx. 55 lbs.
Weight
GENERAL INFORMATION
GROUNDING INSTRUCTIONS
This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed
and grounded in accordance with the National Electrical Code and local codes and ordinances.
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the
electric current.
WARNING: Improper use of the grounding plug can result in a risk of electric shock.
4
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
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 branch circuit, using
a grounded receptacle. The receptacle should be located inside the cabinet directly above the Microwave Oven/Hood
system mounting location.
3-Pronged Plug
Grounded
Receptacle Box
Grounding Pin
3-Pronged Receptacle
OVEN DIAGRAM
9
9
1
8
3
5
7
14
2
4
6
12
13
10
11
1. Oven door with see-through window.
2. Door hinges.
3. Stirrer cover.
4. Turntable motor shaft.
5. Oven lamp.
It will light when oven is operating or door is open.
6. Door latches.
8. Time display: Digital display, 99 minutes 99 seconds.
9. Ventilation openings.
10. Light Cover.
11. Grease filters.
12. Removable turntable.
The turntable will rotate clockwise or counterclockwise.
Only remove for cleaning.
13. Removable turntable support.
14. Power supply cord
The oven will not operate unless the door is securely closed.
7. Auto-Touch control panel.
5
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
CONTROL PANEL
MIX CONV COOK LBS KG TURNTABLE OFF HELP
1 Coffee/tea
2 Roll/muffin, fresh
3 Roll/muffin, frozen
4 Hot cereal
CUSTOM HELP
POPCORN
BREAKFAST
5 Scrambled eggs
1 Dinner plate
2 Pasta/casserole
3 Frozen entree
4 Frozen snack
5 Pizza, slice
SNACKS &
REHEAT
1 Baked potatoes
2 Fresh vegetables
3 Frozen vegetables
4 Rice
COMPU DEFROST
COMPU COOK
5 Ground meat
1 2 3 4 5
6 7 8 9 0
POWER
LEVEL
KITCHEN TIMER
CLOCK
MINUTE
PLUS
TURNTABLE
ON/OFF
STOP
START
CLEAR
TOUCH ON
WORK
LIGHT
NIGHT
LIGHT
FAN
HI/LO
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
Thefollowingisadescriptionofcomponentfunctionsduring
oven operation.
To set any program or set the clock, you must first touch
the STOP/CLEAR pad. The display will clear, and " : "
will appear .
OFF CONDITION
COOKING CONDITION
Closing the door activates the door sensing switch and
secondary interlock switch. (In this condition, the monitor
switch contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the
control unit. (Figure O-1).
ProgramdesiredcookingtimetouchingtheNUMBERpads.
When the START pad is touched, the following operations
occur:
1. The contacts of relays are closed and components
connected to the relays are turned on as follows.
(For details, refer to Figure O-2)
1. The display will show
,
,
,
,
,
,
,
and
.
6
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
RELAY
RY1
CONNECTED COMPONENTS
Oven lamp / Fan motor / Stirrer motor
Power transformer
VARI-MODE
ON TIME
32 sec.
OFF TIME
0 sec.
Power 10(P-HI)
(100% power)
RY2
Power 9(P-90)
(approx. 90% power)
30 sec.
2 sec.
RY3
Turntable motor
RY4
Hood fan motor
Power 8(P-80)
(approx. 80% power)
Power 7(P-70)
26 sec.
24 sec.
6 sec.
8 sec.
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 feed-
box, and then into the cavity where the food is placed to
be cooked.
5. Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off, and the
generation of microwave energy is stopped. The oven
will revert to the OFF condition.
6. When the door is opened during a cook cycle, monitor
switch, door sensing switch, secondary interlock switch
andprimaryinterlockrelayareactivatedwiththefollowing
results. The circuits to the stirrer motor, the cooling fan
motor, the turntable motor, and the high voltage
components are de-energized, and the digital read-out
displays the time still remaining in the cook cycle when
the door was opened.
(approx. 70% power)
Power 6(P-60)
(approx. 60% power)
22 sec.
18 sec.
16 sec.
12 sec.
8 sec.
10 sec.
14 sec.
16 sec.
20 sec.
24 sec.
26 sec.
32 sec.
Power 5(P-50)
(approx. 50% power)
Power 4(P-40)
(approx. 40% power)
Power 3(P-30)
(approx. 30% power)
Power 2(P-20)
(approx. 20% power)
Power 1(P-10)
(approx. 10% power)
6 sec.
Power 0(P-0)
(0% power)
0 sec.
Note: The ON/OFF time ratio does not correspond with
the percentage of microwave power, because
approx. 2 seconds are needed for heating of the
magnetron filament.
7. Themonitorswitchiselectricallymonitoringtheoperation
of the secondary interlock switch and primary interlock
relay(RY2)andismechanicallyassociatedwiththedoor
so that it will function in the following sequence.
(1) When the door opens from a closed position, the
primaryinterlockrelayandsecondaryinterlockswitch
open their contacts, and then the monitor switch
contacts close.
COMPU COOK
COMPU COOK will automatically compute the microwave
power and cooking time. Set the desired program by touch-
ing one of the COMPU COOK pad, and number pad to
select menu. Enter the weight or quantity by touching the
Number pads. When the START pad is touched, the follow-
ing operations occur:
(2) When the door is closed from the open position, the
monitor switch contacts first open, and then the
contacts of the secondary interlock switch and door
sensing switch close.
1. The COOK indicator will light.
2. The cooking time will appear on the display and start
counting down to zero. The cooking time is adjusted
automatically according to the weight of the food.
3. The shut-off relays (RY1, RY2 and RY3) are energized,
turning on the oven lamp, turntable motor, cooling fan
motor and convection motor. The power supply voltage
is applied to the heating element.
If the secondary interlock switch and primary 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, secondary interlock
switch and primary interlock relay (RY2), causing the moni-
tor fuse to blow.
4. Now, the oven is in the microwave cooking mode.
COMPU DEFROST COOKING
POWER LEVEL P-0 TO P-90 COOKING
The COMPU DEFROST key is a special function key to
defrost meats and poultry faster and better. COMPU DE-
FROST automatically defrosts roast beef, etc.. Touch the
COMPU COOK pad and number pad to select menu and
enter the food weight by touching the number pads. When
the START pad is touched, the oven will cook according to
the special cooking sequence.
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:
7
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
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.
_: AIR FLOW
TO DUCT
TO DUCT
HOOD FAN MOTOR
HOOD
INTAKE
DUCT
GREASE
FILTER
2. HORIZONTAL VENTING
The air handing is the same as VERTICAL VENTING
except that the final air discharge is directed horizontally
out from the top rear of the oven into the customer's vent
system.
_: AIR FLOW
HOOD FAN MOTOR
TO DUCT
HOOD
INTAKE
DUCT
GREASE
FILTER
3. RE-CIRCULATION (INSIDE VENTING)
The air handing is the same as VERTICAL VENTING
except that the final air discharge is directed horizontally
through the upper front of the oven into the kitchen. IN
this case, the accessory charcoal filter RK-230 must be
provided to filter the air before it leaves the oven.
_: AIR FLOW
HOOD EXHAUST
LOUVER
CHARCOAL
FILTER
HOOD FAN MOTOR
HOOD
INTAKE
DUCT
8
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
CAVITY
THERMAL CUT-OUT
MAGNETRON
TEMPERATURE FUSE
CONTROL UNIT
COM.
N.O.
FUSE
20A
B7
B5
RY4
POWER
TRANSFORMER
RY5
N.C.
HOOD FAN
THERMAL
CUT OUT
E1
E2
High
B3
B1
GRN
GND
DOOR
SENSING
SWITCH
Low
HOOD
120 V AC.
60 Hz
CAPACITOR
RY3
A5
RY1
N.O.
RY2
COM.
HOOD
MOTOR
HIGH VOLTAGE
CAPACITOR
0.94µF
A1
A3
B9
A7
TTM
HOOD
LAMP
OL
HL
HL
HIGH VOLTAGE
RECTIFIER
FM
STM
SECONDARY
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" PAD TOUCHED
CAVITY
THERMAL CUT-OUT
MAGNETRON
TEMPERATURE FUSE
CONTROL UNIT
COM.
N.O.
FUSE
20A
B7
B5
RY4
POWER
TRANSFORMER
RY5
N.C.
HOOD FAN
THERMAL
CUT OUT
E1
E2
High
B3
B1
GRN
GND
DOOR
SENSING
SWITCH
Low
HOOD
120 V AC.
60 Hz
CAPACITOR
RY3
A5
RY1
N.O.
RY2
COM.
HOOD
MOTOR
HIGH VOLTAGE
CAPACITOR
0.94µF
A1
A3
B9
A7
TTM
HOOD
LAMP
OL
HL
HL
HIGH VOLTAGE
RECTIFIER
FM
STM
SECONDARY
INTERLOCK
SWITCH
Figure O-2. Oven Schematic-Cooking Condition
9
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
DESCRIPTION AND FUNCTION OF COMPONENTS
CAUTION: BEFORE REPLACING A BLOWN MONITOR
DOOR OPEN MECHANISM
FUSE TEST THE DOOR SENSING SWITCH,
PRIMARY INTERLOCK RELAY (RY2), SEC-
ONDARY INTERLOCK SWITCH AND MONI-
TOR SWITCH FOR PROPER OPERATION.
(REFERTOCHAPTER"TESTPROCEDURE").
NOTE: MONITOR FUSE AND SWITCH ARE REPLACED
AS AN ASSEMBLY
The door is opened by pulling the door handle, refer to the
Figure D-1.
Latch
Hook
Latch
Heads
Door
Sensing
Switch
TEMPERATURE FUSE (MG)
The temperature fuse located near the waveguide is
designed to prevent damage to the magnetron if an over
heated condition develops in the tube due to cooling fan
failure, obstructed air guide, dirty or blocked air intake, etc.
Under normal operation, the temperature fuse remains
closed. However, the temperature fuse will open at 302˚F
(150˚C) causing the oven to shut down.
Monitor
Fuse
Monitor
Switch
Door
Secondary
Interlock
Switch
Figure D-1. Door Open Mechanism
THERMAL CUT-OUT (HOOD )
This thermal cut-out located on the right base plate. It is
designed to automatically turn on the hood fan motor
whenever the hot air rising from the conventional range
below causes the temperature at the thermal cut-out to rise
to 140˚F (60˚C) or higher, thus removing this hot air from
around microwave oven. When the temperature around the
thermal cut-out drops to 113˚F (45˚C) or lower, the thermal
cut-out shuts off the hood fan motor.
DOOR SENSING AND SECONDARY INTERLOCK
SWITCHES
The secondary interlock switch is mounted in the lower
position of the latch hook and the door sensing switch in the
primary interlock system is mounted in the upper position of
the latch hook. They are activated by the latch heads on the
door. When the door is opened, the switches interrupt the
circuit to all components. A cook cycle cannot take place
until the door is firmly closed thereby activating both inter-
lock switches. The primary interlock system consists of the
door sensing switch and primary interlock relay located on
the control circuit board.
THERMAL CUT-OUT (CAVITY )
This thermal cut-out is located on the top of the oven cavity.
It is designed to prevent damage to the oven unit if the food
in the oven catches fire due to overheating produced by
improper setting of cooking time or failure of control unit.
Undernormaloperation,thethermalcut-out remainsclosed.
However, the thermal cut-out will open at 293˚F (145˚C)
causing the oven to shut down.
MONITOR SWITCH
Themonitorswitchisactivated(thecontactsopened)bythe
latch head on the door while the door is closed. The switch
is intended to render the oven inoperative by means of
blowing the monitor fuse when the contacts of the primary
interlock relay (RY2) and secondary interlock switch fail to
open when the door is opened.
TURNTABLE MOTOR
The turntable motor rotates the turntable located on the
bottom of the oven cavity, so that the foods on the turntable
cook evenly during cooking. Turntable will turn in either
direction. The turntable motor can be turned off by touching
TURNTABLE ON/OFF pad.
Functions:
1. When the door is opened, the monitor switch contact
close (to the ON condition) due to their being normally
closed. At this time the primary interlock relay (RY2) and
secondary interlock switch are in the OFF condition
(contacts open) due to their being normally open contact
switches. And the contacts of relay (RY1) are in the ON
condition (contacts close).
2. As the door goes to a closed position, the monitor switch
contacts are first opened and then the door sensing
switchandthesecondaryinterlockswitchcontactsclose.
(On opening the door, each of these switches operate
inversely.)
COOLING FAN MOTOR
The cooling fan motor drives a blade which draws external
cool air. This cool air is directed through the air vanes
surroundingthemagnetronandcoolsthemagnetron.Thisair
is channelled through the oven cavity to remove steam and
vapors given off from the heating foods. It is then exhausted
through the exhausting air vents at the oven cavity.
HOOD FAN MOTOR
The hood fan motor is a two-speed, single-phase, double
pole induction type, requiring a hood fan capacitor. It is
located outside the upper rear part of the oven cavity, is to
remove, from around the oven, hot air rising from the
conventional electric or gas range over which it is installed.
3. If the door is opened, and the primary interlock relay
(RY2) and secondary interlock switch contacts fail to
open,themonitorfuseblowssimultaneouslywithclosing
of the monitor switch contacts.
10
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
This air is then expelled either vertically or horizontally
through the customer supplied duct system, or discharged
back into the kitchen.
HOOD LAMP
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 WORK LIGHT pad or the NIGHT LIGHT pad.
And also the brightness can be varied to high or low by
touching the WORK LIGHT pad or the NIGHT LIGHT pad.
STIRRER MOTOR
The stirrer motor drives the stirrer fan to stir the microwave
radiation from the waveguide.
TROUBLESHOOTING GUIDE
Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.
When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many
of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which
will be found in the "Test Procedure "section.
IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, relay (RY1)
primary interlock relay (RY2), door sensing switch and secondary interlock switch before replacing the
monitor fuse. If 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.
11
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
CK = Check / RE = Replace
CK LOW VOLTAGE
CK NO POWER AT OUTLET
RE SHORTED IN POWER CORD
CK OPENED OR SHORTED WIRING
CK HOOD MOTOR CAPACITOR
RE HOOD LAMP OR SOCKET
CK TURNTABLE OFF CONDITION
RE STIRRER MOTOR
RE TURNTABLE MOTOR
RE FAN MOTOR
RE OVEN LAMP OR SOCKET
P
O
N
N
N
N
N
M
L
FOIL PATERN ON P.W.B.
COMPU DEFROST
RELAY (RY-5)
RELAY (RY-4)
RELAY (RY-3)
RELAY (RY-2)
RELAY (RY-1)
KEY UNIT
CONTROL UNIT
K
J
HOOD FAN MOTOR
HOOD HERMAL CUT-OUT
MONITOR FUSE
I
H
G
F
MONITOR SWITCH
PRIMARY INTERLOCK SYSTEM
SECONDARY INTERLOCK SWITCH
TEMPERATURE FUSE OR THERMAL CUT-OUT
HIGH VOLTAGE CAPACITOR
H.V. RECTIFIER
E
D
C
B
A
POWER TRANSFORMER
MAGNETRON
POSSIBLE CASE AND
DEFECTIVE PARTS
12
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
A
MAGNETRON ASSEMBLY TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. 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.
5. 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.
6. Reconnect all leads removed from components during testing.
7. Reinstall the outer case (cabinet).
8. Reconnect the power supply cord after the outer case is installed.
9. 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
shouldonlybeusedifabovetestsdonotindicateafaultymagnetronandthereisnodefectinthefollowing
componentsorwiring:siliconrectifier,highvoltagecapacitorandpowertransformer.Thistestwillrequire
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
secondscooktime. Allowthewatertoheatfor60seconds, measuringwithastopwatch, secondhand
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. Subtractthecoldwatertemperaturefromthehotwatertemperature.Thenormalresultshouldbe27.7
to 51.5˚F(15.4 to 28.6˚C) rise in temperature. If the water temperatures are accurately measured and
tested for the required time period the test results will indicate if the magnetron tube has low power
output (low rise in water temperature) which would extend cooking time or high power output (high
rise in water temperature) which would reduce cooking time. Because cooking time can be adjusted
to compensate for power output, the magnetron tube assembly should be replaced only if the water
temperature rise test indicates a power output well beyond the normal limits. The test is only accurate
if the power supply line voltage is 120 volts and the oven cavity is clean.
B
POWER TRANSFORMER TEST
1. 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 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 90 ohms; the resistance of the filament coil should be less than 1 ohm.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
13
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
TEST PROCEDURES
PROCEDURE
COMPONENT TEST
LETTER
(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. 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 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. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. 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.
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.
E
CAVITY THERMAL CUT-OUT TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the
temperature of the thermal cut-out reaches approximately 293˚F(145˚C).
An open thermal cut-out indicates overheating of the oven, exchange the oven thermal cut-out and
check inside of oven cavity and for improper setting of cooking time or operation of control unit. Check
forrestrictedairflowthroughtheventholesoftheovencavity, especiallythecoolingfanandairguide.
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.
MAGNETRON TEMPERATURE FUSE TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. A continuity check across the temperature fuse terminals should indicate a closed circuit. If the
temperatureofthemagnetronreachesapproximately302˚F(150˚C), thetemperaturefuseopens. 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.
14
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
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
ATROOMTEMPERATURE, REPLACETHERMALCUT-OUTORTEMPERATUREFUSE.
F
SECONDARY INTERLOCK SWITCH TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Isolatetheswitchandconnecttheohmmetertothecommon(COM.)andnormallyopen(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.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
G
PRIMARY INTERLOCK SYSTEM TEST
DOOR SENSING SWITCH
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Isolatetheswitchandconnecttheohmmetertothecommon(COM.)andnormallyopen(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.
PRIMARY INTERLOCK RELAY (RY2)
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect two (2) wire leads from the male tab terminals of the Primary Interlock Relay. Check the
state of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay contacts
are closed, replace the circuit board entirely or the relay itself.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
H
MONITOR SWITCH TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Before performing this test, make sure that the secondary interlock switch and the primary interlock
relayareoperatingproperly, accordingtotheaboveSwitchTestProcedure. Disconnectthewirelead
from the monitor switch (COM) terminal. Check the monitor switch operation by using the ohmmeter
asfollows. Whenthedoorisopen, themetershouldindicateaclosedcircuit. Whenthemonitorswitch
actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven cavity
15
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
withthedooropened(inthisconditiontheplungerofthemonitorswitchispushedin),themetershould
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.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnectthepowersupplycordafter
the outer case is installed.
Black
/White
White
8. Run the oven and check all functions.
Screw Driver
Secondary
Interlock
Switch
Monitor
Switch
Ohmmeter
I
BLOWN MONITOR FUSE TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary
interlock switch and monitor switch according to the "TEST PROCEDURE" for those switches before
replacing the blown monitor fuse.
CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK
RELAY, SECONDARYINTERLOCKSWITCH, DOORSENSINGSWITCHANDMONITOR
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. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. A continuity check across the thermal cut-out terminals should indicate an open circuit unless the
temperature of the thermal cut-out reaches approximately 140˚F(60˚C) or more. At that temperature,
the contacts will close. The thermal cut-out opens automatically at approximately 113˚F(45˚C).
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.
K
HOOD FAN MOTOR TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. If the motor does not turn, touch the FAN HI / LO pad once (set hood fan motor power "HIGH") and
check voltage between pins "1" and "2" (Blue and Black wires) of the 6 pin connector. If 120 Volts
appear and the hood capacitor is good, replace the hood fan assembly. If 120 Volts does not appear,
check the motor circuit. The resistance values of motor terminals are as follows:
16
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
Resistance between;
YLW
4
BLU
1
BLU (1) AND YLW (4) = 0Ω (Shorted)
BLK (2) AND YLW (4) = 32Ω
BLU (1) AND BLK (2) = 32Ω
BLK (2) AND WHT (3) = 20Ω
WHT (3) AND RED (5) = 45Ω
HOOD FAN
CAPACITOR
32 Ω
BLU BLK WHT
45 Ω
20 Ω
5
2
1
2
3
BLK
3
RED
6-PIN CONNECTOR
OF HOOD FAN MOTOR
WHT
4
5
YLW RED
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.
L
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 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) 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.
1. Key Unit.
NOTE ;
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) Check key unit ribbon connection before replacement.
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.
The following symptoms indicate a defective key unit.
a) When touching the pads, a certain pad produces no signal at all.
b) When touching a number pad, two figures or more are displayed.
c) When touching the pads, sometimes a pad produces no signal.
If the key unit is defective.
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Replace the key unit.
5) Reconnect all leads removed from components during testing.
6) Re-install the outer case (cabinet).
17
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
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.
When testing is completed,
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Reconnect all leads removed from components during testing.
5) Re-install the outer case (cabinet).
6) Reconnect the power supply cord after the outer case is installed.
7) Run the oven and check all functions.
M
KEY UNIT TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. 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.
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.
G 1
G 2
G 3
G 4
G 5
G 6
G 7
G 8
WORK
LIGHT
BREAK CUSTOM
FAST
1
7
2
6
HELP
TURN
TABLE
SNACKS
&
POWER
LEVEL
NIGHT
LIGHT
POPCORN
8
9
3
4
REHEAT
ON / OFF
KITCHEN
TIMER
CLOCK
COMPU COMPU
COOK DEFROST
STOP
CLEAR
FAN
HI / LO
START
TOUCH ON
MINUTE
PLUS
0
5
18
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
N
RELAY TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between Pin No. 7 of the 4 pin connector (A) and the
common terminal of the relay RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1 and RY2 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated ................... Defective relay.
DC. voltage not indicated ............. Check diode which is connected to the relay coil. If diode is
good, control unit is defective.
RELAY SYMBOL
OPERATIONAL VOLTAGE
Approx. 24.0V D.C.
Approx. 24.0V D.C.
Approx. 24.0V D.C.
Approx. 24.0V D.C.
Approx. 24.0V D.C.
CONNECTED COMPONENTS
Oven lamp / Fan motor / Stirrer motor
Power transformer
RY1
RY2(COOK)
RY3
Turntable motor
RY4
Hood motor
RY5
Hood motor (HIGH /LOW selection)
8.Disconnect the power supply cord, and then remove outer case.
9.Open the door and block it open.
10.Discharge high voltage capacitor.
11.Reconnect all leads removed from components during testing.
12.Re-install the outer case (cabinet).
13.Reconnect the power supply cord after the outer case is installed.
14.Run the oven and check all functions.
O
COMPU DEFROST TEST
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the " COMPU DEFROST " pad once and touch the Number pad "1" and touch
the Number pad "5". And then touch the "START" pad.
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows
WEIGHT
1ST STAGE
LEVEL TIME LEVEL
70% 35sec. 0%
2ND STAGE
TIME LEVEL TIME
40sec. 50% 30sec.
3RD STAGE
4TH STAGE
LEVEL
30%
TIME
35sec.
0.5lbs
(5) 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, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Follow the troubleshooting guide given below for repair.
19
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
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".
5) Makeavisualinspectionofthevaristor.
Checkforburneddamageandexamine
the transformer with a tester for the
presence of layer short-circuit (check
the primary coil resistance which is
approximately 192Ω ± 15%). If any
abnormalconditionisdetected,replace
the defective parts.
2
1
T1
D20
d
(470V)
VRS1
b
a
7
1
CN-A
7
5
3
1
c
RY3
AC(N) TTM
AC(H)
6) Reconnect all leads removed from components during testing.
7) Re-install the outer case (cabinet).
8) Reconnect the power supply cord after the outer case is installed.
9) Run the oven and check all functions.
2. Follow the troubleshooting guide given below, if indicator does not light up after above check and
repairs are finished.
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power transformer.
5) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
6) After that procedure, re-connect the power supply cord.
7) Follow the troubleshooting guide given below for repair.
STEPS
OCCURRENCE
CAUSE OR CORRECTION
The rated AC voltage is not present between
Pin No. 7 of the 4-pin connector (A) and the
common terminal of the relay RY1.
1
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.
2
8) Disconnect the power supply cord, and then remove outer case.
9) Open the door and block it open.
10) Discharge high voltage capacitor.
11) Reconnect all leads removed from components during testing.
12) Re-install the outer case (cabinet).
13) Reconnect the power supply cord after the outer case is installed.
14) Run the oven and check all functions.
20
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
3) Synchronizing Signal Circuit
The touch control section consists of the following units
as shown in the touch control panel 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.
(1) Key Unit
(2) Control Unit
4) ACL Circuit
The principal functions of these units and the signals com-
municated among them are explained below.
A circuit to generate a signals which resetting the LSI to
the initial state when power is applied.
Key Unit
5) Buzzer Circuit
The key unit is composed of a matrix, signals generated in
the LSI are sent to the key unit through P00 - P07.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through R24 - R27
to perform the function that was requested.
The buzzer responds to signals from the LSI to emit
audiblesounds(keytouchsoundandcompletionsound).
6) Door Sensing Switch
A switch to inform the LSI if the door is open or closed.
Control Unit
7) Relay Circuit
Control unit consists of LSI, power source circuit, synchro-
nizing signal circuit, ACL circuit, buzzer circuit, relay circuit
and indicator circuit.
To drive the magnetron, fan motor, stirrer motor, turnta-
ble motor, hood motor, and light the oven lamp and hood
lamp.
1) LSI
8) Indicator Circuit
This LSI controls the key strobe signal, relay driving
signal for oven function and indicator signal.
Indicator element is a Fluorescent Display.
Basically, a Fluorescent Display is a triode having a
cathode, a grid and an anode. Usually, the cathode of a
Fluorescent Display is directly heated and the filament
serves as cathode.
2) Power Source Circuit
This circuit generates voltages necessary for the control
unit from the AC line voltage.
The Fluorescent Display has 8-digits, 15-segments are
used for displaying figures.
Symbol
Voltage
Application
LSI(IC1)
VC
VP
-5.1V
-28V
Fluorescentdisplaytube:Grid
and anode voltage
VF1-VF2
2.7Vac
Filament of fluorescent dis-
play tube
(VF1 to VF2 voltage)
21
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
DESCRIPTION OF LSI
LSI(IZA876DR)
The I/O signals of the LSI(IZA876DR) are detailed in the following table.
Pin No.
Signal
VCC
I/O
IN
Description
1
2
Connected to GND.
VEE
IN
Anode (segment) of Fluorescent Display illumination voltage: -31V.
Vp voltage of power source circuit input.
3
4
AVSS
VREF
IN
IN
Power source voltage:-5V.
VC voltage of power source circuit input.
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V)
Terminal not used.
5-6
7-9
10
AN7-AN6
AN5-AN3
AN2
IN
IN
IN
Heating constant compensation terminal.
Input signal which communicates the door open/close information to LSI.
Door closed; "L" level signal(0V).
Door opened; "H" level signal(-5V).
Connected to GND(0V).
11-12
13
AN1-AN0
P55
IN
OUT
Terminal not used.
14
P54
OUT
Oven lamp, Stirrer motor and Fan motor driving signal. (Square Waveform : 60Hz)
16.7 msec.
To turn on and off the shut-off relay(RY1). The
H
square waveform voltage is delivered to the
L
relay(RY1) driving circuit.
During cooking
15
P53
OUT
Turntable motor driving signal.
To turn on and off relay(RY3). "L" level: During
H : GND
OFF
Turntable ON. "H" level: During Turntable OFF or
L
ON
during the oven is off condition.
16
17
P52
P51
OUT
OUT
Terminal not used.
Magnetron high-voltage circuit driving signal.
To turn on and off the cook
relay(RY2). In P-HI operation, the
signals holds "L" level during mi-
crowave cooking and "H" level
while not cooking. In other cook-
ing modes (P-90,P-80,P-70,P-
60,P-50,P-40,P-30,P-20,P-10,P-
0) the signal turns to "H" level and
"L" level in repetition according to
the power level.
VARI-MODE
ON TIME
32 sec.
30 sec.
26 sec.
24 sec.
22 sec.
18 sec.
16 sec.
12 sec.
8 sec.
OFF TIME
0 sec.
P-HI (100% power)
P-90 (approx. 90% power)
P-80 (approx. 80% power)
P-70 (approx. 70% power)
P-60 (approx. 60% power)
P-50 (approx. 50% power)
P-40 (approx. 40% power)
P-30 (approx. 30% power)
P-20 (approx. 20% power)
P-10 (approx. 10% power)
P-0 (0% power)
2 sec.
6 sec.
8 sec.
10 sec.
14 sec.
16 sec.
20 sec.
24 sec.
26 sec.
32 sec.
6 sec.
0 sec.
18
19
P50
P47
OUT
OUT
Terminal not used.
Hood lamp driving signal.
AC
CURRENT
To turn on and off solid state relay(SSR1). "1"
level: During Hood lamp ON (WORK LIGHT level).
"2" level: During Hood lamp ON (NIGHT LIGHT
level). "H" level: During Hood lamp OFF.
WORK
LIGHT
H
1
2
L
NIGHT
LIGHT
H
L
H : GND
20
21
P46
P45
OUT
OUT
Hood motor driving signal.
Toturnonandoffrelay(RY9)."L"level:DuringHood
motor ON. "H" level: During Hood motor OFF.
OFF
L
ON
Hood motor high / low driving signal.
Toturnonandoffrelay(RY5)."L"level:DuringHood
motor high. "H" level: During Hood motor low.
H : GND
L
OFF
ON
22
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
Pin No.
Signal
I/O
Description
22
23
P44
P43
OUT
OUT
Terminal not used.
0.1 sec
Signal to sound buzzer.
A: key touch sound.
B: Completion sound.
A
B
C
2 sec
C: Whenthetemperatureoftheovencavityreaches
the preset temperature in the preheating mode,
or when the preheating hold time (30 minutes) is
elapsed.
1 sec
1 sec
H: GND
L
24
25
P42
IN
IN
Terminal not used.
INT1
Signal to synchronize LSI with commercial power source frequency.
This is the basic timing for all real time processing of LSI.
H : GND
L (-5V)
16.7 msec
26
27
P40
IN
IN
Connected to VC.
RESET
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily set
to "L" level the moment power is applied, at this time the LSI is reset. Thereafter set at "H"
level.
28-29
30
P71-P70
XIN
OUT
IN
Terminal not used.
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
31
32
33
XOUT
VSS
P27
OUT
IN
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Power source voltage:-5V.
VC voltage of power source circuit input.
IN
Signal coming from touch key.
When any one of G12 line keys on key matrix is touched, a corresponding signal will be
input into P27. When no key is touched, the signal is held at "L" level.
34
P26
P25
IN
IN
Signal similar to P27.
When any one of G11 line keys on key matrix is touched, a corresponding signal will be
input into P26.
35
Signal similar to P27.
When any one of G10 line keys on key matrix is touched, a corresponding signal will be
input into P25.
36
P24
IN
Signal similar to P27.
WhenanyoneofG9linekeysonkeymatrixistouched, acorrespondingsignalwillbeinput
into P24.
37-40
P23-P20
OUT
Digit selection signal.
The relationship between digit signal and digit are as follows;
Digit signal .................................. Digit
H
P14................................................ 1st.
P15...............................................2nd.
ß(60Hz)
L
GND
P16............................................... 3rd.
P14
VP
P17................................................4th.
P15
P20................................................5th.
P16
P21................................................6th.
P22................................................7th.
P23................................................8th.
P17
P20
(ß : INTO signal)
P21
Refer to the touch control panel circuit about the
P22
relation between signals and digits. Normally,
P23
one pulse is output in every synchronized signal
(ß)period,andinputtothegridofthefluorescent
display.
23
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
Pin No.
Signal
I/O
Description
41-44
P17-P14
OUT
Digit selection signal.
Signal similar to P23.
45-48
P13-P10
OUT
Segment data signals.
The relation between signals and indicators are as follows:
Signal
Segment Signal
Segment
P03 ................ P7
P02 ................ P6
P01 ................ P5
P00 ................ P4
P37 ................ P3
P36 ................ P2
P35 ................ P1
P13............... P15
P12............... P14
P11............... P13
P10............... P12
P07............... P11
P06............... P10
P05................. P9
P04................. P8
(ß : INTO signal)
ß(60Hz)
GND
VP
Refer to the touch control panel circuit about the relation between signals and indicators.
Normally, one pulse is output in every synchronized signal (ß) period, and input to the
anode of the fluorescent display.
49
50
51
52
53
54
55
56
P07
P06
P05
P04
P04
P02
P01
P00
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
Segment data signal.
Signal similar to P13.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
of G8 line keys on key matrix is touched.
Segment data signal.
Signal similar to P13.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
of G7 line keys on key matrix is touched.
Segment data signal.
Signal similar to P13.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
of G6 line keys on key matrix is touched.
Segment data signal.
Signal similar to P13.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
of G5 line keys on key matrix is touched.
Segment data signal.
Signal similar to P13.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
of G4 line keys on key matrix is touched.
Segment data signal.
Signal similar to P13.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
of G3 line keys on key matrix is touched.
Segment data signal.
Signal similar to P13.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
of G2 line keys on key matrix is touched.
Segment data signal.
Signal similar to P13.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P27 - P24 terminal while one
of G1 line keys on key matrix is touched.
57-59
60-64
P37-P35
P34-P30
OUT
OUT
Segment data signal.
Signal similar to P13.
Terminal not used.
24
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
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.
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-relatedonesincluded)ofthetouchcontrolpanel
while keeping it connected to the oven.
In order to protect CMOS LSI.
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 brings about 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:
1) When storing and transporting, thoroughly wrap them in
aluminium foil. Also wrap all PW boards containing them
in aluminium foil.
2) When soldering, ground the technician as shown in the
figure and use grounded soldering iron and work table.
approx. 1M ohm
2. Shapes of Electronic Components
Transistor
DTA123ES
KRA101M
KRC243M
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 brings
about an operational state that is equivalent to the oven
door being closed. Connect an external power source to
the power input terminal of the touch control panel, then
it is possible to check and repair the controls of the touch
control panel it is also possible to check the sensor-
related controls of the touch control panel by using the
dummy resistor(s).
B
C
E
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
theservicing,powertothetouchcontrolpanelisavailable
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:
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:Singlebeam,frequencyrange:DC-10MHz
type or more advanced model.
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE MI-
CROWAVEOVENISSTILLLIVEDURINGSERVICING
AND PRESENTS A HAZARD.
Therefore,beforecheckingtheperformanceofthetouch
control panel,
3) Others: Hand tools
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.
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 connector 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)Besuretousespecifiedcomponentswherehighprecision
is required.
4) Re-install the outer case (cabinet).
25
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
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..
Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
WARNING:
1. Disconnect the power supply cord.
4. The door is bent or warped.
2. Visuallycheckthedoorandcavityfaceplatefordamage
(dents, cracks, signs of arcing etc.).
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
and transmission assembly.
Carry out any remedial work that is necessary before
operating the oven.
7. There is visible damage to the oven.
Do not operate the oven if any of the following conditions
exist;
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
WARNING FOR WIRING
To prevent an electric shock, take the following pre-
cautions.
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:
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, Switch 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
andmakesurethatthewireleadsdonot comeoffeven
if the wire leads are pulled.
Magnetron, High voltage transformer, High voltage
capacitor and High voltage rectifier assembly.
2) Hot parts:
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
Oven lamp, Magnetron, High voltage transformer
and Oven cavity.
Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANAL PARTS, DOOR PARTS’, when carrying out any of
the following removal procedures:
THE FOLLOWING ADJUSTMENTS OR COMPONENT REPLACEMENT CAN BE PERFORMED
WITHOUT REMOVING THE OVEN FROM THE WALL
1. Hood lamps, sockets and grease filter.
2. Oven lamp, base cover and hood lamp glass assembly.
3. Turntable motor.
4. Hood exhaust louver.
5. Control panel assembly or components
6. Stirrer cover and stirrer fan.
Push
HOOD EXHAUST LOUVER REMOVAL
Hood exhaust
louver
1. Disconnect the power supply cord.
2. Open the door and block it open.
Tab (left )
3. Remove the one (1) screw holding the hood exhaust
louver to the oven cavity with the outer case cabinet.
Push
Tab (right)
26
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
4. Pull the hood exhaust louver from the oven cavity by
pushing the right and left tabs of the hood exhaust louver
to remove.
5. Now, the hood exhaust louver is free.
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. Removetheturntabletrayandsupportfromtheovencavity.
3. Remove the one (1) screw holding the exhaust damper
assembly to the rear stay, and remove the exhaust
damper assembly by sliding it backward.
6. While supporting the front of the oven, unfasten the two
(2) unit mounting screws holding the oven to the unit
mounting plate.
7. Remove the oven by sliding it into the arms of the unit
mounting plate and pull the power cord out of the wall
cabinet.
4. Remove the two (2) screws holding the oven (outer case
cabinet) to the top cabinet.
5. Remove the hood exhaust louver referring to "HOOD
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.
EXHAUST LOUVER REMOVAL".
OUTER CASE REMOVAL
free it from retaining clips on the cavity face plate.
7. Disconnect the three (3) pin connector of the power
supply cord from the wiring harness and remove the
power supply cord together with the outer case.
8. Discharge high voltage capacitor.
CAUTION: 1. DISCONNECT OVEN FROM POWER
SUPPLY BEFORE REMOVING OUTER
CASE.
Remove the oven from the wall and proceed as follows;
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. Remove one (1) screw holding the hood exhaust louver
to the oven, and pull it forward to remove by pushing the
right and left tabs of the hood exhaust louver. (Refer to
procedureof "HOODEXHAUSTLOUVERREMOVAL".)
4. Remove four (4) screws holding the rear stay to the hood
fan motor or the oven, and remove it.
2. DISCHARGE THE HIGH VOLTAGE
CAPACITOR BEFORE TOUCHING ANY
OVEN COMPONENTS OR WIRING.
5. Remove the four (4) screws from the rear of the outer
case cabinet.
6. Slide the outer case cabinet back about 1 inch (3 cm) to
POWER TRANSFORMER REMOVAL
Re-install
1. Disconnect the power supply cord, remove the oven
from wall, and remove outer case. (Refer to procedure of
"RemovalofOvenfromWall"and "OuterCaseRemoval".)
And proceed as follows.
1. Install by sliding the transformer on the right base plate
with its primary terminals toward the outer case.
2. Secure the transformer with two (2) screws to right base
plate.
2. Open the door and block it open.
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-installthehoodductholdingthefanmotortotheoven
cavity front flange with one (1) screw.
5. Reconnect the wire leads to the chassis support and the
fan motor, referring to "PICTORIAL DIAGRAM".
6. Re-installtheoutercaseandcheckthatovenisoperating
properly.
3. Discharge high voltage capacitor.
4. Remove one (1) screw holding the hood duct to the oven
cavity front flange.
5. Disconnect the stop switch harness from the chassis
supportanddisconnectthewireleadsfromthefanmotor.
6. Lift up the fan motor side of the hood duct.
7. Disconnect filament leads of transformer from the
magnetron and capacitor.
8. Disconnect high voltage leads of capacitor from the
transformer.
9. Disconnect wire leads from transformer.
10.Remove two (2) screws holding the transformer to right
base plate.
CAUTION: MAKE SURE THE WIRE LEADS NEVER
TOUCH THE FAN BLADE.
HOOD FAN MOTOR, HOOD DUCT AND OVEN LAMP SOCKET REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"RemovalofOvenfromWall"and"OutercaseRemoval")
2. Open the door and block it open.
5. Remove the hood fan motor from the hood duct by lifting
it up.
6. Now, the hood fan motor is free.
7. Remove one(1)screwholdingthehoodducttotheoven
cavity front plate.
3. Discharge high voltage capacitor.
4. Disconnect the 6-pin connector of the hood fan motor
from the main wire harness located at the right edge of
the hood duct and release the snap band from the hood
duct.
8. Release the 6-pin connector and the 3-pin connector of
the main harness A from the hood duct.
9. Disconnectthewireleadsfromthefanmotorandchassis
support, and release the wire leads from holes of the
27
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
hood duct.
17.Now, the oven lamp socket and the hood duct are free.
10.Remove the two (2) unit mounting screws from the
chassis support (right side) and the hood duct (left side).
11.Remove the one (1) screw holding the chassis support.
12.Remove the chassis support.
13.Removethehoodductfromtheovencavitybyliftingitup
14.Screw the oven lamp off from the lamp socket.
15.Remove the lamp socket from the lamp angle.
16.Pull the wire leads from the oven lamp socket by pushing
the terminal hole of the oven lamp socket with the small
flat type screw driver.
Oven lamp
socket
Terminal
Wire lead
Terminal hole
Flate type small
screw driver
MAGNETRON REMOVAL
1. Disconnect the power supply cord , remove the oven
from wall and remove outer case (Refer to procedure of
"RemovalofOvenfromWall"and"OutercaseRemoval".)
2. Open the door and block it open.
8. Disconnect the filament lead of the transformer from the
magnetron.
9. Removethepowertransformerfromtherightbaseplate,
referring to "POWER TRANSFORMER REMOVAL".
10.Carefully remove four (4) mounting screws holding the
magnetron to waveguide. When removing the screws
hold the magnetron to prevent it from falling.
11.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 SE-
CURELY.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from the fan motor and the
chassis support, and release them from the holes of
hood duct.
5. Remove the one (1) screw holding the hood duct to the
ovencavityfrontplate,andliftupthefanmotorsideofthe
hood duct.
6. Remove the one (1) screw holding the capacitor holder to
the hood intake duct.
7. Disconnect the high voltage wire leads of the high
voltage rectifier assembly from the magnetron.
HIGH VOLTAGE RECTIFIER AND HIGH VOLTAGE CAPACITOR REMOVAL
1. Disconnect the power supply cord , remove the oven
from wall and remove outer case (Refer to procedure of
"RemovalofOvenfromWall"and"OutercaseRemoval".)
2. Open the door and block it open.
voltage capacitor.
8. Disconnect high voltage wire from capacitor.
9. Remove one(1)screwholdingcapacitorholderandhigh
voltage rectifier to the hood intake duct.
10.Disconnect the high voltage rectifier assembly from the
high voltage capacitor.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from the fan motor and the
chassis support, and release them from the holes of
hood duct.
11.Now, the high voltage rectifier assembly is free.
12.Remove capacitor from the holder.
5. Remove the one (1) screw holding the hood duct to the
oven cavity front flange, and lift up the fan motor side of
the hood duct.
6. Disconnect the high voltage wire leads with high voltage
rectifier from the magnetron.
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.
7. Disconnect filament lead of the transformer from high
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
"RemovalofOvenfromWall"and"OutercaseRemoval")
2. Open the door and block it open.
cut-out.
5. Remove one (1) screw holding the thermal cut-out to the
right base plate.
6. Removethehoodfanthermalcut-outfromthe rightbase
plate.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from the hood fan thermal
7. 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
"RemovalofOvenfromWall"and"OutercaseRemoval")
2. Open the door and block it open.
28
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
NOTE: Whenthetabisbrokenorturnedoff,usetheanother
tab which is fixed near the slit when the new thermal
cut-out is replaced.
3. Discharge high voltage capacitor.
4. Remove two (2) unit mounting screws.
5. Remove the hood duct. (Refer to the procedure of "
HOOD FAN MOTOR, HOOD DUCT AND OVEN LAMP
SOCKET REMOVAL".
Top of Oven Cavity
Tab
6. Straighten the tab holding the thermal cut-out to the top
plate of the oven cavity.
Thermal
Cut-Out
Waveguide
7 . Release the thermal cut-out (cavity) from the one slit of
the oven cavity top plate.
8. Disconnect the wire leads from the thermal cut-out
(cavity).
Slit
Thermal
Cut-Out
(Cavity)
Thermal
Cut-Out
Tab
9. Now, the thermal cut-out (cavity) is free.
TEMPERATURE FUSE (MAGNETRON) REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"RemovalofOvenfromWall"and"OutercaseRemoval")
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Remove the hood fan motor and the hood duct from the
oven cavity, referring to the procedure of " HOOD FAN
MOTOR, HOOD DUCT AND OVEN LAMP SOCKET
REMOVAL".
5. Disconnect the wire leads from the temperature fuse
(Magnetron).
6. Remove the one (1) screw holding the temperature fuse
(Magnetron) to the oven cavity.
7. Now, the temperature fuse (Magnetron) is free.
COOLING FAN MOTOR REMOVAL
1. Disconnect the power supply cord, remove the oven
from wall and remove outer case (Refer to procedure of
"RemovalofOvenfromWall"and"OutercaseRemoval".)
2. Open the door and block it open.
Rear View
Coil
Groove joint pliers
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from the fan motor and the
chassis support.
Stator
Gap
5. Remove one (1) screw holding the hood duct to oven
cavity.
Bracket
Rotor
Side View
6. Release the wire leads from the hole of the hood duct.
7. Lift up the fan motor side of the hood duct.
8. Remove the two (2) screws holding the fan motor to the
hood duct.
9. Removethefanbladefromthefanmotorshaftaccording
the following procedure.
10.Hold the edge of the rotor of the fan motor by using a pair
of groove joint pliers.
Shaft
Axis
These are the positions
that should be pinched
with pliers
Stator
Rotor
CAUTION:
INSTALLATION
*
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.
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.
*
*
Do not touch the pliers to the coil of the fan motor
because the coil may be cut or injured.
Do not disfigure the bracket by touching with the
pliers.
3. Apply the screw lock tight into the hole (for shaft) of the
fan blade.
4. Install the fan blade to the shaft of fan motor by pushing
thefanbladewithasmall,lightweight,ballpeenhammer
or rubber mallet.
11.Remove the fan blade from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.
12. Now, the fan blade will be free.
CAUTION:
5. Installthefanmotortothehoodductwiththetwo(2)screws.
CAUTION:
*
*
*
Do not hit the fan blade strongly when installing
because the bracket may be disfigured.
Make sure that the fan blade rotates smooth after
installation.
*
Do not reuse the removed fan blade because the
hole (for shaft) may be larger than normal.
13.Now, the fan motor is free.
Make sure that the axis of the shaft is not slanted.
29
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
6. Install the hood duct to the oven cavity with the one (1)
screw.
Shaft
7. Re-install the wire leads to the hole of the hood duct.
8. Connect the wire leads to the fan motor and chassis
support, referring to the pictorial diagram.
9. Refer to procedure of "OUTER CASE REMOVAL". And
reverse their procedure. And re-install the outer case.
Table
Center of
bracket
TURNTABLE MOTOR REMOVAL
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. Remove the three (3) screws holding the base cover to
the oven cavity
down and moving to the left slightly.
5. Disconnect the wire leads from the turntable motor.
6. Remove two (2) screws holding turntable motor to the
oven cavity.
4. Remove the base cover from the oven cavity by pulling
7. Now the turntable motor is free.
STIRRER 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.
5. Disconnect the wire leads from the stirrer motor.
6. Remove the two (2) screws holding the stirrer motor to
the waveguide of the oven cavity.
7. Remove the stirrer motor from the waveguide.
8. Now, the stirrer motor is free.
3. Discharge high voltage capacitor.
4. Remove the hood fan motor and the hood duct from the
oven cavity, referring to the procedure of " HOOD FAN
MOTOR, HOOD DUCT AND OVEN LAMP SOCKET
REMOVAL".
9. When installing the stirrer motor, the shaft of stirrer
motor must be inserted to the stirrer fan shaft. Refer to
the procedure of "STIRRER COVER AND STIRRER
FAN INSTALLATION".
STIRRER COVER AND STIRRER FAN INSTALLATION
Shaft
1. Put the stirrer fan on the stirrer cover to match the stirrer
fan shaft to the center of the stirrer support.
2. Insert the shaft of stirrer fan to the shaft of stirrer motor.
3. Insert the cutout of stirrer cover to the tabs on the ceiling.
4. Install the stirrer cover to the oven cavity, and secure it
by one canoe clip.
Stirrer Fan
Stirrer Support
Stirrer
Cover
Canoe Clip
OVEN LAMP REMOVAL
1. Disconnect the power supply cord.
REMOVAL")
2. Remove one (1) screw holding the hood exhaust louver
to oven cavity front flange.
3. Remove the hood exhaust louver from the oven by
pushingtherightandlefttabsofthehoodexhaustlouver.
(Refer to procedure of "HOOD EXHAUST LOUVER
4. Lift the oven lamp cover up.
5. Now, the oven lamp and the socket are found.
6. Screw the oven lamp off from the lamp socket.
7. Now, the oven lamp is free.
CONTROL PANEL ASSEMBLY, CONTROL UNIT AND KEY UNIT REMOVAL
1. Disconnect the power supply cord.
2. Open the door and block it open.
8. Disconnect the connectors CN-A, CN-B, CN-E and CN-
F from the control unit.
3. Remove one (1) screw holding the hood exhaust louver
to oven cavity front flange.
4. Remove the hood exhaust louver from the oven by
pushingtherightandlefttabsofthehoodexhaustlouver.
(Refer to procedure of "HOOD EXHAUST LOUVER
REMOVAL")
9. Remove the control panel assembly from the oven.
10.Now, the control panel assembly is free.
11.Disconnect the connector CN-G from the control unit.
12.Remove four (4) screws holding the control unit to the
key fixing plate.
13.Release the two (2) tabs holding the control unit to the
key fixing plate.
14.Now, the control unit is free.
5. Remove one (1) screw holding the control panel to the
oven cavity front face plate.
6. Release the control panel from the oven cavity front face
plate by lifting it up.
15.Remove the one (1) screw holding the key fixing plate to
the control panel.
7. Disconnect the wire leads from the relays RY1 and RY2.
16.Release the four (4) tabs holding the key fixing plate to
30
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
the control panel.
of the display board as shown in step 3.
17.Remove the key fixing plate from the control panel.
18.Tear the key unit from the key fixing plate.
19.Now, the key unit is free
4. Insert the bottom edge of the display board under the tab
of control panel as shown in step 4.
5. Place the top edge of the display board on the clip (F).
Andpressthe displayboarddownwardasshowninstep
4. (Holes in middle of display board should be positioned
into locator pins.)
NOTES FOR KEY UNIT REPLACEMENT
1. Do not reuse the torn key unit because the performance
of the adhesive becomes weak.
2. Before attaching a new key unit, wipe off remaining
adhesiveonthekeyfixingplatesurfacescompletelywith
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.
6. After installing display board, press the CPU downward
90˚ until CPU is locked into place by the clips.
7. Hold the CPU with the four (4) screws.
8. After installing CPU, make sure jumper wires are not
bent, touching or broken.
Top edge of the display board
4. Stick the key unit firmly to the key fixing plate by rubbing
with soft cloth not to scratch.
Display
Board
NOTESFORNEWCONTROLUNITREPLACEMENT
1. Before installation of the new CPU into the control panel,
grasp the middle section between thumb and finger,
bend the display board forward a until b breaks as
shown in step 1.
b
Middle
section
Break
point
c
2. To remove the middle section push both sides of the
middle section towards d until c breaks as shown in
step 2.
LSI
Control Unit
NOTE: Discard the middle section.
CN-G
3. After removing the middle section, bend the display
board 90˚, positioning the jumper wires into the notches
a
b
Middle
Section
Jumper
wires
Jumper
wires
d
Clip (F)
c
Control
panel
Notches
Clip (E)
Locator pin
STEP 1
STEP 2
STEP 3
STEP 4
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
"RemovalofOvenfromWall"and"OutercaseRemoval")
2. Open the door and block it open.
Positive lock®
connector
4
Push
3. Discharge high voltage capacitor.
4. Push the lever of positive lock® connector.
5. Pull down on the positive lock® connector.
Lever
CAUTION: WHEN CONNECTING THE POSITIVE LOCK®
CONNECTORS TO THE TERMINALS, IN-
STALL THE POSITIVE LOCK® SO THAT THE
LEVER FACES YOU
5
Pull down
Positive lock® connector
DOOR SENSING SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"RemovalofOvenfromWall"and"OutercaseRemoval")
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Remove the control panel assembly, referring to the
31
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
switch is in the lower position, door sensing switch is in
the upper position and the monitor switch is in the middle
position.
procedure of "CONTROL PANEL ASSEMBLY ,
CONTROL UNIT AND KEY UNIT REMOVAL".
5. Remove the two (2) screws holding the latch hook to the
oven cavity front flange.
6. Remove the latch hook from the oven cavity front flange.
7. Disconnect the wire leads of each switch.
8. Remove each switch from the latch hook by pushing the
one (1) stopper tub holding each switch.
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".
9. Now, each switch is free.
Re-install
1. Re-installeachswitchinitsplace.Thesecondaryinterlock
DOOR SENSING SWITCH, SECONDARY 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
"RemovalofOvenfromWall"and"OutercaseRemoval")
2. Open the door and block it open.
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.
3. Discharge high voltage capacitor.
4. Remove the control panel assembly, referring to the
procedure of "CONTROL PANEL ASSEMBLY ,
CONTROL UNIT AND KEY UNIT REMOVAL".
If the door sensing switch, secondary interlock switch and
monitor switch do not operate properly due to a
misadjustment, the following adjustment should be made.
5. Loosen the two (2) screws holding latch hook to the oven
cavity front flange.
6. Withdoorclosed,adjustlatchhookbymovingitbackand
forth, and up and down. In and out play of the door
allowed by the upper and lower position of the latch hook
should be less than 0.5mm. The vertical position of the
latch hook should be adjusted so that the door sensing
switch and secondary interlock switch are activated with
the door closed. The horizontal position of the latch hook
shouldbeadjustedsothatthemonitorswitchisactivated
with the door closed.
2. The door sensing switch and secondary interlock switch
interrupt the circuit before the door can be opened.
3. Monitor switch contacts close when door is opened.
4. The contact of door sensing switch and secondary
interlock switch open within 1.2mm gap between right
side of cavity face plate and door when door is open.
5. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
Latch
Hook
Latch
Heads
Door
Sensing
Switch
Monitor
Fuse
7. Secure the screws with washers firmly.
8. Check all of the switches operation. If any switch has not
activated with the door closed, loosen screw and adjust
the latch hook position.
Monitor
Switch
Door
Secondary
Interlock
Switch
After adjustment, check the following.
1. In and out play of door remains less than 0.5mm when in
Figure C-1. Latch Switch Adjustments
DOOR REPLACEMENT
8. Lift up the door assembly to release the upper and lower
door hinge pins from the upper and lower oven hinges.
9. Now, the door assembly is free.
DOOR ASSEMBLY REMOVAL
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"RemovalofOvenfromWall"and"OutercaseRemoval")
2. Open the door and block it open.
Note: When the individual parts are replaced, refer to
"Door Disassembly".
3. Discharge high voltage capacitor.
DOOR ASSEMBLY RE-INSTALL
1. Onre-installingdoor,insertthelowerovenhingetolower
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. Makesureupperandlowerovenhingesareinsertedinto
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
4. Removethehoodexhaustlouverfromtheovencavityby
pushingtherightandlefttabsofthehoodexhaustlouver.
(Refer to the procedure of "HOOD EXHAUST LOUVER
REMOVAL".)
5. Insert a putty knife (thickness of about 0.5mm) into the
gap A between the door stopper and the choke cover
as shown in Figure C-3 to free engaging parts.
6. Lift up the door stopper.
7. Now, the door stopper is free from the door assembly.
32
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
latch holes correctly.
of microwave energy from oven cavity during
cook cycle. This function does not require that
door be air-tight, moisture (condensation)-tight
orlight-tight. Therefore, occasionalappearance
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.
6. Re-install the door stopper to the door assembly.
7. Re-install the hood exhaust louver to the oven cavity
front face plate.
Note: After any service to the door;
(A) Make sure that door sensing switch and secondary
interlock switch are operating properly. (Refer to
chapter "Test Procedures".)
(B) An approved microwave survey meter should be
used to assure compliance with proper microwave
radiation emission limitation standards.
Tab
Hood Exhaust Louver
Upper Door
Hige Pin
Tab
Upper
Oven
Hige
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.
RE-INSTALL
Door assembly
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.
Lower
Oven Hige
4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
Lower Door
Hige Pin
Latch
Heads
Door Stopper
RE-INSTALL
Note: The door on a microwave oven is designed to
act as an electronic seal preventing the leakage
Figure C-2. Door Replacement and adjustment
DOOR DISASSEMBLY
1. Disconnect the power supply cord and remove the oven
from wall and remove outer case. (Refer to procedure of
"RemovalofOvenfromWall"and"OutercaseRemoval")
2. Open the door and block it open.
LATCH SPRING, LATCH HEAD AND DOOR PANEL
13.Release the latch spring from the tab of the latch head
and tab of the door frame.
14.Release the latch head from the door frame.
15.Now, the latch spring, latch head and door frame are
3. Discharge high voltage capacitor.
4. Removethehoodexhaustlouverfromtheovencavityby
pushingtherightandlefttabsofthehoodexhaustlouver.
(Refer to the procedure of "HOOD EXHAUST LOUVER
REMOVAL".)
free.
Door Stopper
A
Choke Cover
5. Remove door assembly, refer to "Door Replacement".
Replacement of door components are as follows:
6. Place door assembly on a soft cloth with latches facing
up.
Note: As the engaging part of choke cover and door frame
are provided at 15 places, do not force any particular
part.
Putty Knife
Door Frame
CHOKE COVER
7. Insert a putty knife (thickness of about 0.5mm) into the
gap A between the choke cover and door stopper and
between the choke cover and the door frame as shown
Figure C-3 to free engaging parts.
8. Pry the principles of the lever and lift up the choke cover
by inserting a putty knife in order shown in Figure C-3.
9. Nowchokecoverisfreefromdoorpanelanddoorframe.
Figure C-3. Door Disassembly
DOOR GLASS
16.Remove the glass stopper from the door frame by
releasing the tab of door frame.
17.At first, slide the door glass toward the glass stopper
side, andthenslideitup. Andreleaseitfromtherightand
lower long tabs of the door frame.
DOOR FRAME
18.Release the door glass from the upper long tab of the
door frame.
19.Release the door glass from the long tabs of the door
frame.
10.Remove six (6) screws holding the door panel and the
door handle to the door frame assembly.
11.Release the door frame assembly from the door panel.
NOTE: Itiseasiertoreleasetheengagingpartsoftheupper
or lower door hinge pin side at first.
20.Now, the door glass is free.
12.Now, door frame assembly is free.
33
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
6
4
5
2
1
3
A
B
C
D
E
F
A
B
C
D
E
F
G
G
H
H
6
4
5
2
1
3
34
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
6
4
5
2
1
3
2 9 8 G
2 8 7 G
2 7 6 G
2 6 5 G
2 5 4 G
2 4 3 G
2 3 2 G
2 2 1 G
R 8 3 3 . 3 k
D 7 7
R 8 2 3 . 3 k
D 7 6
A
B
C
D
E
F
A
B
C
D
E
F
R 8 1 3 . 3 k
D 7 5 2
2 0 P 1 5
1 9 P 1 4
1 7 P 1 3
1 6 P 1 2
1 5 P 1 1
R 8 0 3 . 3 k
D 7 4
1 3 P 1 0
1 2 P 9
R 7 9 3 . 3 k
D 7 3
1 1 P 8
1 0 P 7
9 P 6
R 7 8 3 . 3 k
D 7 2
8 P 5
7 P 4
6 P 3
5 P 2
4 P 1
R 7 7 3 . 3 k
D 7 1
R 9 3 1 0 0 k
R 9 2 1 0 0 k
R 9 1 1 0 0 k
G 9
G 1 0
G 1 1
G 1 2
R 7 3 3 . 3 k
R 7 2 3 . 3 k
R 7 1 3 . 3 k
R 7 0 3 . 3 k
I Z A 8 7 6 D R
I C 1
C 7
( J 1 5 )
4 . 7 k
R 7
C 8
( J 7 )
( J 5 )
( J 3 )
( J 6 )
( J 4 )
( J 2 )
4 . 7 k
R 8
H Z 4 A 2
Z D 4
/ 3 µ 5 v C 6 1 0
C 5
/ 5 0 v
0 . 1
C 9
µ
Z D 3 H Z 5 C 2
R 4 0 3 . 3 k
D 3 1
/ 5 µ 0 v
C 2 1 0 . 1
R 3 0 1 5 k
S P 4 0
/ 3 µ 5 v
C 2 0 1 0
Z D 1 H Z 6 A 3
R 1 4 . 3 k 1 / 2 w
/ 3 µ 5 v
C 2 1 0 0 0
/ 5 µ 0 v
C 1 0 . 1
G
G
D 2 0
D 2 5
D 2 6
D 2 7
D 2 8
1 0 G 4 7 1 K
V R S 1
( J 1 )
/ 2 µ 5 0 v
C 1 1 0 0 . 0 3 3
R 1 1 0 4 7 1 / 2 w
C 1 1 0
R 1 1 0
H
H
6
4
5
2
1
3
35
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
6
4
5
2
1
3
A
B
C
D
E
F
A
B
C
D
E
F
DIP
1
1
33
,BFB
27
28
29
R10
30
31
(J11)
(J10)
12
(R100)
1
(IC2)
(R76)
(J12)
32
(D70)
R77
R78
R79
R80
R81
R82
R83
D71
D72
D73
D74
D75
D76
64
33
D77
R70
R71
R72
34
C10
1
32
R73
C6
C5
IC1
(J15)
35
CF1
C7
ZD3
E
B
Q24
B
R7
ZD4
R30
42
Q25
E
E
R4
E
Q4
B
B
Q26
B
3
1
D30
SP40
E
ZD1
Q28
R40
R1
SSR1
C110
C3
D4
D1
R3
B
(Q1)
(R2)
(ZD2)
R110
D25
46
47
4
3
5
6
RY4
RY5
S1
S2
P
48
2
1
T1
G
G
D20
(470V)
VRS1
7
1
(CN - A)
CN - A
7
5
3
1
MICRO
OL
FM
RY3
AC(N) TTM
AC(H)
H
H
Figure S-3. Printed Wiring Board
6
4
5
2
1
3
36
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
PARTS LIST
Note: The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V.
"§" MARK: PARTS DELIVERY SECTION
REF. NO.
PART NO.
§
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
1-17
FH-DZB012MRY0 M High voltage rectifier assembly
RC-QZA173WRE0 M High voltage capacitor
QFS-TA013WRE0 M Temperature fuse 150˚C (Magnetron)
RMOTDA182WRE0 M Turntable motor
RMOTDA214WRE0 M Stirrer motor
RTHM-B005MRE0 M Thermal cut-out N.O. 60˚C (Hood Fan)
RTRN-B055MRE0 M Power transformer
RV-MZA280WRE0 M Magnetron
QFSHDB003MRE0 M Fuse holder
QSW-MA110WRE0 M Secondary interlock and door sensing switches
FFS-BA016/KIT M Monitor switch with fuse assembly
FACCDB011MRE0 M Power supply cord
1
1
1
1
1
1
1
1
1
2
1
1
3
1
1
3
1
AK
AR
AG
AQ
AQ
AG
BE
BD
AD
AE
AF
AP
AE
BE
AR
AG
AG
*
*
*
∆
*
QSOCLB006MRE0 M Oven lamp socket
FMOTEA366WRK0 M Hood fan motor
RMOTEA346WRE0 M Fan motor
RLMPTA071WRE0 M Oven lamp
RTHM-A080WRE0 M Thermal cut-out 145˚C (Cavity)
CABINET PARTS
2- 1
2- 2
2- 2
2- 2
2- 3
2- 4
2- 5
2- 5
2- 5
2- 6
2- 7
2- 7
2- 7
2-7-1
2-7-1
2-7-1
2-7-2
2- 8
2- 8
2- 8
LSTY-B021MRP0 M Rear stay
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AF
AT
AT
AT
AM
AA
BA
BB
BC
AB
AN
AM
AM
AG
AG
AG
AH
AY
AY
AY
PDIF-B018MRF0 M Hood exhaust louver [R-1480]
PDIF-B019MRF0 M Hood exhaust louver [R-1481]
PDIF-B020MRF0 M Hood exhaust louver [R-1482]
GDAI-B045MRP0 M Right base plate
PCUSUB040MRP0 M Base cover cushion
GCABUB084MRP0 M Outer case cabinet [R-1480]
GCABUB085MRP0 M Outer case cabinet [R-1481]
GCABUB086MRP0 M Outer case cabinet [R-1482]
TMAPCB052MRR0 M Schematic diagram
FANGKB009MRY0 M Hood lamp glass assembly [R-1480]
FANGKB010MRY0 M Hood lamp glass assembly [R-1481]
FANGKB011MRY0 M Hood lamp glass assembly [R-1482]
LANGQB016MRP0 M Hood lamp glass angle [R-1480]
LANGQB020MRP0 M Hood lamp glass angle [R-1481]
LANGQB027MRP0 M Hood lamp glass angle [R-1482]
PGLSPB004MRE0 M Hood lamp glass
PCOVPB064MRt0 M Base cover [R-1480]
PCOVPB066MRt0 M Base cover [R-1481]
PCOVPB067MRt0 M Base cover [R-1482]
CONTROL PANEL PARTS
3- 1
3- 1A
3- 1B
3- 1C
3- 1D
3- 1E
3- 1F
C1
DPWBFB081MRU0 M Control unit
1
1
1
1
1
1
1
1
1
1
1
2
2
1
1
1
4
1
1
1
4
1
4
2
7
BL
AA
AA
AB
AE
AS
AB
AB
AF
AH
AB
AH
AB
AB
AM
AH
AA
AK
AC
AD
AB
AA
AA
AA
AA
QCNCMA447DRE0 M 4-pin connector CN-A
QCNCMA448DRE0 M 5-pin connector CN-B
QCNCMA275DRE0 J 2-pin connector CN-E
QCNCWA030DRE0 J 12-pin connector CN-G
RV-KXB004MRE0 M Fluorescent display tube
PTPEHB010MRE0 M Tape 2mm
RC-KZA087DRE0 J Capacitor
VCEAB31VW108M J Capacitor
VCKYD11CY103N J Capacitor
VCEAB31VW106M J Capacitor
VCKYD11CY103N J Capacitor
RC-KZA087DRE0 J Capacitor
VCEAB31VW106M J Capacitor
VCEAB31HW104M J Capacitor
VCKYD11CY103N J Capacitor
0.1 uF
1000 uF
0.01 uF
10 uF
0.01 uF
0.1 uF
10 uF
0.1 uF
0.01 uF
330 pF
50V
35V
16V
35V
16V
50V
35V
50V
16V
50V
C2
C5
C6
C7-8
C9-10
C20
C21
C30
C70-73 VCKYD11HB331K J Capacitor
C100
C110
CF1
D1-4
D20
RC-QZB014MRE0 M Capacitor
7 uF 230V
RC-QZB019MRE0 M Capacitor 0.033 uF 250V
RCRS-A010DRE0 J Ceramic resonator (CST4.00MGW)
VHD11ES1///-1 J Diode (11ES1)
VHD1SS270A/-1 J Diode (1SS270A)
D25-28 VHD1SS270A/-1 J Diode (1SS270A)
D30-31 VHD1SS270A/-1 J Diode (1SS270A)
D71-77 VHD1SS270A/-1 J Diode (1SS270A)
37
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
REF. NO.
PART NO.
§
DESCRIPTION
Q'TY CODE
IC1
Q3
RH-IZA876DRE0 J LSI
1
1
1
1
3
1
1
1
1
1
1
1
2
1
1
1
1
1
4
7
3
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
5
AW
AB
AA
AB
AB
AB
AB
AB
AH
AA
AH
AB
AA
AH
AA
AA
AA
AA
AA
AA
AA
AH
AG
AG
AH
AG
AG
AM
AE
AC
AA
AA
AZ
AZ
AZ
AU
AU
AU
AF
AB
VSKRA101M//-3 J Transistor (KRA101M)
VSDTA123ES/-3 J Transistor (DTA123ES)
VSKRA101M//-3 J Transistor (KRA101M)
Q4
Q20
Q24-26 VSKRA101M//-3 J Transistor (KRA101M)
Q27
Q28
Q30
R1
VSKRC243M//-3 J Transistor (KRC243M)
VSKRA101M//-3 J Transistor (KRA101M)
VSKRA101M//-3 J Transistor (KRA101M)
VRD-B12HF432J J Resistor
VRD-B12EF152J J Resistor
VRS-B13AA751J J Resistor
VRD-B12HF511J J Resistor
VRD-B12EF472J J Resistor
VRD-B12HF3R3J J Resistor
VRD-B12HF102J J Resistor
VRD-B12EF153J J Resistor
VRD-B12EF472J J Resistor
VRD-B12EF332J J Resistor
4.3k ohm 1/2W
1.5k ohm 1/4W
750 ohm 1W
R2
R3
R4
510 ohm 1/2W
4.7k ohm 1/4W
3.3 ohm 1/2W
1k ohm 1/2W
15k ohm 1/4W
4.7k ohm 1/4W
3.3k ohm 1/4W
3.3k ohm 1/4W
3.3k ohm 1/4W
100k ohm 1/4W
47 ohm 1/2W
R7-8
R10
R20
R30
R31
R40
R70-73 VRD-B12EF332J J Resistor
R77-83 VRD-B12EF332J J Resistor
R91-93 VRD-B12EF104J J Resistor
R110
RY1-2
RY3-4
RY5
SSR1
SP40
T1
VRS-A12HA470J J Resistor
RRLY-A113DRE0 M Relay (DU24D1-1PR(M))
RRLY-A080DRE0 J Relay (OJ-SH-124LM)
RRLY-A112DRE0 M Relay (VE24HSE-K)
RH-SZA009DRE0 M Solid state relay
RALM-A014DRE0 J Buzzer (PKM22EPT)
RTRNPB014MRE0 M Transformer
VRS1
RH-VZA032DRE0 J Varistor (10G471K)
ZD1
VHEHZ6A3///-1 J Zener diode (HZ6A-3)
VHEHZ5C2///-1 J Zener diode (HZ5C-2)
VHEHZ4A2///-1 J Zener diode (HZ4A-2)
FPNLCB205MRK0 M Control panel sub. assembly [R-1480]
FPNLCB211MRK0 M Control panel sub, assembly [R-1481]
FPNLCB212MRK0 M Control panel sub, assembly [R-1482]
ZD3
ZD4
3- 2
3- 2
3- 2
3- 2-1 FUNTKB153MRE0 M Key unit [R-1480]
3- 2-1 FUNTKB159MRE0 M Key unit [R-1481]
3- 2-1 FUNTKB160MRE0 M Key unit [R-1482]
3- 2-2 GMADIB030MRF0 M Display window
3- 3
XEPSD30P10XS0 M Screw; 3mm x 10mm
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
FFTA-B003MRK0 M Exhaust damper assembly
FROLPB024MRK0 M Turntable support assembly
NTNT-A090WRE0 M Turntable tray
LANGKB010MRP0 M Capacitor holder
FCOVPB012MRY0 M Stirrer cover assembly
FFAN-B006MRK0 M Stirrer fan assembly
************* M Oven cavity (Not replaceable part)
PPACGB014MRF0 M Turntable motor packing
PHOK-B017MRF0 M Latch hook
LANGTB036MRP0 M Unit mounting plate
NFANPB001MRE0 M Fan blade
LBSHC0037WRE0 M Cord bushing
PCOVPB065MRP0 M Oven lamp cover
PDUC-B077MRP0 M Hood intake duct
PCUSUB039MRP0 M Hood intake duct cushion
PFILWB005MRP0 M Lamp filter
PSKR-B012MRP0 M Magnetron air guide
LANGTB040MRP0 M Chassis support
PDUC-B078MRF0 M Hood duct
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
2
1
1
1
1
AH
AK
AN
BB
AK
AL
--
AA
AG
AP
AC
AB
AD
AG
AA
AB
AB
AE
AX
AB
AC
AE
∆
∆
PCUSUB043MRP0 M Hood duct cushion
LSTPPB031MRF0 M Door stopper
PCUSUB045MRP0 M Cushion
DOOR PARTS
∆
∆
∆
∆
∆
∆
∆
5
CDORFB203MRK0 M Door assembly [R-1480]
CDORFB205MRK0 M Door assembly [R-1481]
CDORFB206MRK0 M Door assembly [R-1482]
FDORFB060MRT0 M Door panel assembly
FCOV-B125MRK0 M Door frame assembly [R-1480]
FCOV-B127MRK0 M Door frame assembly [R-1481]
FCOV-B128MRK0 M Door frame assembly [R-1482]
1
1
1
1
1
1
1
BD
BE
BE
AX
AS
AS
AS
5
5
5- 1
5- 2
5- 2
5- 2
38
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
REF. NO.
PART NO.
§
DESCRIPTION
Q'TY CODE
∆ 5-2-1
∆ 5-2-1
∆ 5-2-1
5-2-2
PGLSPB012MRE0 M Front door glass [R-1480]
PGLSPB014MRR0 M Front door glass [R-1481]
PGLSPB013MRR0 M Front door glass [R-1482]
LSTPPB030MRF0 M Latch head
1
1
1
1
1
1
1
1
1
1
1
6
AQ
AQ
AQ
AC
AC
AB
AG
AF
AK
AK
AK
AA
5-2-3
LSTPPB032MRF0 M Glass stopper
5-2-4
MSPRTA046WRE0 M Latch spring
∆ 5- 3
GCOVHB035MRF0 M Choke cover
5- 4
PSHEPB024MRE0 M Sealer film
5- 5
JHNDPB007MRF0 M Door handle [R-1480]
JHNDPB008MRF0 M Door handle [R-1481]
JHNDPB009MRF0 M Door handle [R-1482]
XCPSD40P08000 M Screw : 4mm x 8mm
5- 5
5- 5
5- 6
MISCELLANEOUS
6- 1
CFZK-B131MRK0 M Installation material assembly
LBSHC0040MRE0 M Grommet
LX-BZ0195WRE0 M Toggle screw
LX-MZ0001WRE0 M Cord holder
1
1
4
1
2
1
6
2
1
1
1
1
1
1
2
1
1
1
1
1
1
AM
AC
AC
AC
AC
AA
AA
AA
AB
AD
AC
AB
AD
AU
AA
AA
AB
AM
AH
AF
AA
6-1-1
6-1-2
6-1-3
6-1-4
6-1-5
6-1-6
6-1-7
6- 2
XBRSD50P60000 M Screw : 5mm x 60mm
XOTSD40P12000 M Screw : 4mm x 12mm
XTSSD50P35000 M Screw : 5mm x 35mm
XWHSD50-16300 M Washer
TINSEB177MRR0 M Installation instruction
TINSEB178MRR0 M Operation manual
TINSKB047MRR0 M Top template
TINSKB048MRR0 M Wall template
QW-QZB023MRE0 M High voltage wire A
FW-VZB145MRE0 M Main harness A
TCAUAA025WRR0 M Caution label
TCAUAB015MRR0 M Monitor caution label
TCAUAB005MRR0 M DHHS caution label
FW-VZB149MRE0 M Stop switch harness
PFIL-B004MRE0 M Chacoal filter
PFIL-B002MRE0 M Grease filter
PCLIC0020MRE0 M Canoe clip
6- 3
6- 4
6- 5
6- 6
*
6- 7
6- 8
6- 9
6-10
6-11
6-12
6-13
6-14
SCREWS,NUTS AND WASHERS
7- 1
7- 2
7- 2
7- 2
7- 3
7- 4
7- 5
7- 6
7- 7
7- 8
7- 9
XCPSD40P08000 M Screw : 4mm x 8mm
XOTSF40P12000 M Screw : 4mm x 12mm [R-1480]
XOTSE40P12000 M Screw : 4mm x 12mm [R-1481]
XOTSD40P12000 M Screw : 4mm x 12mm [R-1482]
XOTSD40P12000 M Screw : 4mm x 12mm
XBTSD40P08000 M Screw : 4mm x 8mm
LX-CZA038WRE0 M Special screw
3
4
AA
AB
AA
AA
AA
AA
AA
AA
AA
AA
AD
4
4
24
2
4
LX-CZ0052WRE0 M Special screw
2
LX-BZ0081YBE0 M Screw : 4mm x 8mm
XCPSD30P08000 M Screw : 4mm x 8mm
LX-BZB012MRE0 M Unit mounting screw
5
4
2
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER
Order Parts from the authorized SHARP parts Distributor for your area.
Defective parts requiring return should be returned as indicated in the Service Policy.
2. REF. NO.
3. PART NO.
4. DESCRIPTION
39
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
6
4
5
2
1
3
7-3
4-1
OVEN AND CABINET PARTS
7-3
A
B
C
D
E
F
A
B
C
D
E
F
1-14
4-13
2-1
7-5
4-19
7-3
4-10
2-5
7-3
4-12
4-11
1-3
7-4
1-12
2-6
7-5
1-15
7-1
1-16
1-5
1-13
1-17
4-18
7-8
7-3
1-3
7-3
6-10
7-9
4-7
4-18
6-12
4-16
4-20
7-3
2-2
1-8
4-9
6-9
4-6
1-10
1-9
7-6
7-9
6-8
4-8
1-4
4-22
4-5
1-11
1-2
4-14
6-8
4-17
7-8
1-10
4-4
7-1
7-7
6-14
7-3
7-8
1-7
7-8
1-6
4-3
1-1
6-13
4-15
2-8
G
G
7-3
2-3
7-3
6-13
2-4
4-2
1-13
2-7-2
2-7
H
H
1-16
7-2
2-7-1
7-2
6
4
5
2
1
3
40
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
6
4
5
2
1
3
CONTROL PANEL PARTS
3 - 3
3 - 2
A
B
C
D
E
F
A
3-1E
3 - 1
3-2-2
3-2-1
3 - 3
7 - 3
B
C
D
E
F
3 - 3
DOOR PARTS
5
4-21
5-4
5-6
5-1
5-6
5-2-1
5-3
5-6
5-2-3
5-2
5-5
5-2-2
MISCELLANEOUS
5-2-4
6-1
6-1-1
6-1-4
6-1-5
6-7
6-1-2
6-1-3
6-1-6
6-1-7
6-6
G
G
6-11
H
H
6
4
5
2
1
3
41
Download from Www.Somanuals.com. All Manuals Search And Download.
R-1480
R-1481
R-1482
6
4
5
2
1
3
PACKING AND ACCESSORIES
A
B
C
A
B
C
D
E
F
TOP PAD
SPADBB026MRE0
DOOR PROTECTOR
SPADP0221MRE0
TRAY PACK
SPADPB037MRE0
4-3
TURNTABLE TRAY
6-1
INSTALL MATERIAL ASSEMBLY
WRAP COVER
SSAKH0103MRE0
6-3
6-5
OPERATION MANUAL
WALL TEMPLATE
D
E
F
INSTALLATION INSTRUCTION
TOP TEMPLATE
6-2
6-4
6-13
GREASE FILTER (x 2)
BOTTOM PAD
SPADBB025MRE0
G
G
Non-replaceable items
H
H
PACKING CASE
6
4
5
2
1
3
COPYRIGHT © 1998 BY SHARP CORPORATION
ALL RIGHTS RESERVED.
No part of this publication may be repro-
duced, stored in retrieval systems, or trans-
mitted in any form or by any means, elec-
tronic, mechanical, photocopying, record-
ing, or otherwise, without prior written per-
mission of the publisher.
'98 SHARP CORP. (3S2.530E) Printed in U.S.A
42
Download from Www.Somanuals.com. All Manuals Search And Download.
|