Sharp | R-90GC | Service manual | Sharp R-90GC Service manual

R-90GC
SERVICE MANUAL
S7212R90GC///
HIGH SPEED CONVECTION
MICROWAVE OVEN
MODEL
R-90GC
In the interest of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
WARNING TO SERVICE PERSONNEL: Microwave ovens contain circuitry capable of producing very high voltage and
current, contact with following parts may result in a severe,
possibly fatal, electrical shock. (High Voltage Capacitor, High
Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..)
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE 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 ............................................................................................................................ 13
TEST PROCEDURE ............................................................................................................................................ 15
TOUCH CONTROL PANEL ................................................................................................................................. 25
PRECAUTIONS FOR USING LEAD-FREE SOLDER ......................................................................................... 29
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 30
PICTORIAL DIAGRAM ........................................................................................................................................ 38
POWER UNIT CIRCUIT ...................................................................................................................................... 39
CPU UNIT CIRCUIT ............................................................................................................................................ 40
GRID ASSIGNMENT OF FLUORESENT DISPLAY TUBE ................................................................................. 41
PRINTED WIRING BOARD ................................................................................................................................. 42
PARTS LIST ........................................................................................................................................................ 43
PACKING AND ACCESSORIES ......................................................................................................................... 49
SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-90GC
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3) seal
and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches,
(5) evidence of dropping or abuse.
(c) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation
and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual
before the oven is released to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be
performed on each oven prior to release to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the Microwave
Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICS
CORPORATION immediately @1-800-237-4277.
If the unit operates with the door open, service person should 1) tell the user not to operate the oven
and 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's
Center for Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit found
with emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unit
until the oven has been brought into compliance.
R-90GC
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with
following parts may result in a severe, possibly
fatal, electrical shock.
(Example)
High Voltage Capacitor, High Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
Don't Touch !
Danger High Voltage
When the testing is completed,
1. Disconnect the power supply cord, and then remove
outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power
transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is
installed.
7. Run the oven and check all functions.
Before Servicing
1. Disconnect the power supply cord
remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
, and then
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
After repairing
The high-voltage capacitor remains charged about 60
seconds after the oven has been switched off. Wait for 60
seconds and then short-circuit the connection of the highvoltage capacitor (that is the connecting lead of the highvoltage rectifier) against the chassis with the use of an
insulated screwdriver.
1. Reconnect all leads removed from components during
testing.
2. Reinstall the outer case (cabinet).
3. Reconnect the power supply cord after the outer case is
installed.
4. Run the oven and check all functions.
Whenever troubleshooting is performed the power supply
must be disconnected. It may, in some cases, be necessary
to connect the power supply after the outer case has been
removed, in this event,
1. Disconnect the power supply cord, and then remove
outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power
transformer.
5. Ensure that the leads remain isolated from other
components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
Microwave ovens should not be run empty. To test for the
presence of microwave energy within a cavity, place a cup
of cold water on the oven turntable, close the door and set
the power to HIGH and set the microwave timer for two (2)
minutes. When the two minutes has elapsed (timer at zero)
carefully check that the water is now hot. If the water
remains cold carry out Before Servicing procedure and reexamine the connections to the component being tested.
When all service work is completed and the oven is fully
assembled, the microwave power output should be checked
and a microwave leakage test should be carried out.
1
R-90GC
MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven
should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition
by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external
surface of the oven.
2) Safety interlock switches: Primary interlock relay and door sensing switch shall prevent microwave radiation emission
in excess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emission
in excess of 5 mW/cm2 at any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for
microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5˚C (68˚F) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)
and made of an electrically nonconductive material such as glass or plastic.
The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage
is measured accurately.
4) Set the cooking control on Full Power Cooking Mode.
5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,
replace it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement)
1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.
2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on
the meter.
3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal
has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closed
latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
and that the secondary interlock switch does turn the oven OFF before any door movement.
NOTE: After servicing, record data on service invoice and microwave leakage report.
2
R-90GC
SERVICE MANUAL
PRODUCT DESCRIPTION
HIGH SPEED CONVECTION
MICROWAVE OVEN
GENERAL INFORMATION
R-90GC
FOREWORD
This Manual has been prepared to provide Sharp Electronics
Corp. Service Personnel with Operation and Service Information
for the SHARP HIGH SPEED CONVECTION MICROWAVE
OVEN, R-90GC.
OPERATION
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.
TOUCH CONTROL PANEL
Check the interlock switches and the door seal carefully. Special
attention should be given to avoid electrical shock and microwave
radiation hazard.
COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is no other visible damage with the oven.
WIRING DIAGRAM
Servicing and repair work must be carried out only by trained service
personnel.
PARTS LIST
DANGER
Certain initial parts are intentionally not grounded and present
a risk of electrical shock only during servicing. Service
personnel - Do not contact the following parts while the
appliance is energized;
High Voltage Capacitor, Power Transformer, Magnetron, High
Voltage Rectifier Assembly, High Voltage Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.
All the parts marked “*” on parts list are used at voltages more than
250V.
Removal of the outer wrap gives access to voltage above 250V.
All the parts marked “∆” on parts list may cause undue microwave
exposure, by themselves, or when they are damaged, loosened
or removed.
SHARP ELECTRONICS CORPORATION
SHARP PLAZA, MAHWAH,
NEW JERSEY 07430-2135
3
R-90GC
SPECIFICATION
ITEM
DESCRIPTION
Power Requirements
240 Volts
7.5 Amperes (Microwave) / 13.0 Amperes (Convection)/ 13.5 Amperes (Speed Cooking)
60 Hertz / Single phase, 3 wire grounded
Power Output
1000 watts (IEC Test Procedure)
Operating frequency of 2450MHz
Top Heater Power Output
1700 Watts
Side Heater Power Output
1200 Watts
Case Dimensions
Width 21-5/8"
Height 16"
Depth 24-5/8"
Cooking Cavity Dimensions
(1.1 Cubic Feet )
Width 16-1/8"
Height 8-3/8"
Depth 13-5/8"
Control Complement
Touch Control System
Timer (0 - 99 min. 99 seconds)
Microwave Power for Variable Cooking
Repetition Rate;
HIGH POWER ......................................... Full power throughout the cooking time
90 PERCENT .............................................................. approx. 90% of Full Power
80 PERCENT .............................................................. approx. 80% of Full Power
70 PERCENT .............................................................. approx. 70% of Full Power
60 PERCENT .............................................................. approx. 60% of Full Power
50 PERCENT .............................................................. approx. 50% of Full Power
40 PERCENT ............................................................... approx. 40% of Full Power
30 PERCENT ............................................................... approx. 30% of Full Power
20 PERCENT .............................................................. approx. 20% of Full Power
10 PERCENT ............................................................... approx. 10% of Full Power
0 PERCENT .............................................. No power throughout the cooking time
Convection Temperature for Variable Cooking
CONVECTION ............................................................. 100 - 450˚F Temp. control
CUSTOM HELP pad, MINUTE PLUS pad, SPEED GRILL pad, SPEED ROAST pad
SPEED BAKE pad, PREHEAT pad, CONVECTION pad, REHEAT pad, POPCORN pad
COMPU COOK pad, COMPU DEFROST pad, BASIC COOK pad, RECIPES pad
UP / DOWN pads, ENTER pad, Number and temperature selection pads,
TIMER / CLOCK pad, STOP/CLEAR pad, POWER LEVEL pad, START pad
Oven Cavity Light
Yes
Safety Standard
UL Listed
FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J
GENERAL INFORMATION
GROUNDING INSTRUCTIONS
This appliance must be grounded. This oven is equipped with a cord having a grounding wire with a 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 risk of electric shock by providing
an escape wire for the electric current.
WARNING – Improper use of the grounding plug can result in a risk of electric shock.
Electrical Requirements
The electrical requirements are a 240 volt 60 Hz, AC only, 15 amp. protected electrical supply. It is recommended that a
separate circuit serving only this appliance be provided. The 240 volt circuit is absolutely necessary for optimum cooking
performance. The oven is equipped with a 3-prong grounding plug. It must be plugged into a wall receptacle that is properly
installed and grounded.
4
R-90GC
Extension Cord
Receptacle Box Cover
If it is necessary to use an extension cord, use only a 3-wire extension cord that has a
3-blade grounding plug and a 3-slot receptacle that will accept the plug on the high speed
oven. The marked rating of the extension cord should be AC 240 volt, 15 amp. or more.
Be careful not to drape the cord over the countertop or table where it can be pulled on
by children or tripped over accidentally.
3 Pronged Plug
(6-15P)
3 Pronged Receptacle
(6-15R)
CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM
THIS PLUG.
OVEN DIAGRAM
1 Door handle
To open the door, pull the handle down and forward. Never hold the door handle when moving the oven.
2 Oven door with see-through window
3 Safety door latches
The oven will not operate unless the door is securely closed.
4 Door hinges
5 Door seals and sealing surfaces
6 Turntable motor shaft
7 Removable turntable support
Carefully place the turntable support in the center of the oven floor. After cooking, always clean the turntable support,
especially around the rollers. These must be free from food splashes and grease. Built-up splashes or grease may
overheat and cause arcing, begin to smoke or catch fire.
8 Removable turntable
Place the turntable on the turntable support securely. The turntable will rotate clockwise or counterclockwise. Only
remove for cleaning.
9 Ventilation openings
9
18
13
3
10 Oven light
It will light when oven is operating or
12
8
door is open.
11 W a v e g u i d e c o v e r : D O N O T
11
14
10
REMOVE.
6
12 Auto-Touch control panel
7
13 Time display: 99 minutes, 99 seconds 5
16
14 Convection air openings
15
15 Removable low rack
17
16 Removable high rack
17 Splash guard
2
1
4
3
18 Ventilation cover: DO NOT REMOVE.
TOUCH CONTROL PANEL
Each indicator shows what function is in progress.
5
R-90GC
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions during
oven operation.
are activated with the following results. The circuits to the
turntable motor, the cooling fan motor, and the high
voltage components are de-energized, the oven lamp
remains on, and the digital read-out displays the time still
remaining in the cook cycle when the door was opened.
7. The monitor switch is electrically monitoring the operation
of the primary interlock relay (RY2) and the secondary
interlock switch and is mechanically associated with the
door so that it will function in the following sequence.
(1) When the door opens from a closed position, the primary
interlock relay (RY2) and the secondary interlock switch
open their contacts. And contacts of the relay (RY1)
remain closed. Then the monitor switch contacts close.
(2) When the door is closed from the open position, the
monitor switch contacts first open, and then the contacts
of the secondary interlock switch close. And contacts of
the relay (RY1) open.
If the primary interlock relay (RY2) and the secondary
interlock switch fail with their contacts closed when the door
is opened, the closing of the monitor switch contacts will
form a short circuit through the monitor fuse, relay (RY1),
primary interlock relay (RY2) and the secondary interlock
switch, causing the monitor fuse to blow.
OFF CONDITION
Closing the door activates the door sensing switch and
secondary interlock switch. (In this condition, the monitor
switch contacts are opened.)
When oven is plugged in, 240 volts A.C. is supplied to the
control unit. (Figure O-1).
1. The display will show "SHARP SIMPLY THE BEST
PRESS CLEAR AND PRESS CLOCK".
To set any program or set the clock, you must first touch
the STOP/CLEAR pad. The display will clear, and " : "
will appear.
NOTE: When the door is opened, the oven lamp comes on.
2. A signal is input to the control unit, energizing the coil of
shut-off relay (RY-4). RY4 contacts close, completing a
circuit to the damper motor. The damper motor now
operates moving the damper to the open position, thereby
closing the contacts of the damper switch inputs a signal
to the control unit. The coil of relay RY-4 is de-energized,
opening its contacts, thereby turning off the damper motor.
MICROWAVE COOKING CONDITION
POWER LEVEL P-0 TO P-90 COOKING
Program desired cooking time Variable Cooking Control by
touching the NUMBER pads and the power level pad. When
the START pad is touched, the following operations occur:
When Variable Cooking Power is programmed, the 240
volts A.C. is supplied to the power transformer intermittently
through the contacts of relay (RY-2). RY-2 is operated by
the control unit within an varying time base. Microwave
power operation is as follows:
1. The contacts of relays are closed and components
connected to the relays are turned on as follows.
(For details, refer to Figure O-2)
CONNECTED COMPONENTS
VARI-MODE
ON TIME
OFF TIME
RY-1
Oven lamp/Turntable motor
HIGH POWER (100% power)
32 sec.
0 sec.
RY-2
Power transformer
90 PERCENT (approx. 90% power)
30 sec.
2 sec.
RY-3
Convection motor
RY-4
Damper motor
80 PERCENT (approx. 80% power)
70 PERCENT (approx. 70% power)
26 sec.
24 sec.
6 sec.
8 sec.
RY-5
Fan motor
60 PERCENT (approx. 60% power)
22 sec.
10 sec.
RY-6
Convection motor
RELAY
2. 240 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
2300 volts A.C. on the high voltage winding.
3. The filament winding voltage heats the magnetron
filament and the H.V. winding voltage is sent to a voltage
doubler circuit.
4. The microwave energy produced by the magnetron is
channelled through the waveguide into the cavity feedbox, and then into the cavity where the food is placed to
be cooked.
5. Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off, and the
generation of microwave energy is stopped. The oven
will revert to the OFF condition.
6. When the door is opened during a cook cycle, monitor
switch, door sensing switch, relay (RY1), the primary
interlock relay (RY2) and the secondary interlock switch
50 PERCENT (approx. 50% power)
18 sec.
14 sec.
40 PERCENT (approx. 40% power)
16 sec.
16 sec.
30 PERCENT (approx. 30% power)
12 sec.
20 sec.
20 PERCENT (approx. 20% power)
8 sec.
24 sec.
10 PERCENT (approx. 10% power)
6 sec.
26 sec.
0 PERCENT (0% power)
0 sec.
32 sec.
Note:
The ON/OFF time ratio does not correspond with
the percentage of microwave power, because
approx. 3 seconds are needed for heating of the
magnetron filament.
CONVECTION COOKING CONDITION
PREHEATING CONDITION
Program desired convection temperature by touching the
PREHEAT pad and the Temperature pad. When the START
pad is touched, the following operations occur: (Figure O-3)
1. The coil of shut-off relays (RY1, RY3 and RY5) are
energized, the oven lamp, cooling fan motor, turntable
6
R-90GC
motor and convection motor are turned on.
2. The coil of relay (RY4) is energized by the control unit.
The damper is moved to the closed position, closing the
damper switch contacts. The closing of the damper
switch contacts sends a signal to the LSI on the control
unit de-energizing the relay (RY4) and opening the
circuit to the damper motor.
3. The solid-state relays are energized by the control unit
and the main supply voltage is applied to the top and side
heating elements.
4. When the oven temperature reaches the selected preheat
temperature, the following operations occur:
4-1 The solid-state relays are de-energized by the control
unit temperature circuit and thermistor, opening the
circuit to the heating elements.
4-2. The oven will continue to function for 30 minutes,
turning the heating elements on and off, as needed
to maintain the selected preheat temperature. The
oven will shutdown completely after 30 minutes
(Figure O-3)
1. The contacts of the relays RY1, RY3 and RY5 are
closed, and the oven lamp, turntable motor, convection
motor and fan motors are energized.
NOTE :The rotate direction of the convection motor is
the same as one of the convection cooking.
2. The damper is moved to the closed position.
3. The solid-state relays are energized and the main supply
voltage is applied to the top and side heating elements.
NOTE :After cooking, the operation of the fan motors,
damper motor is the same as one of the
convection cooking.
SPEED GRILL COOKING
Touch the GRILL pad and then enter cooking time. When
the start pad is touched, following operations occur;
(Figure O-4)
1. The contacts of the relays RY1, RY3, RY5 and RY6 are
closed, and the oven lamp, turntable motor, convection
motor and fan motors are energized.
NOTE :The rotate direction of the convection motor is
reverse to one of the convection cooking by the
relay RY6.
2. The damper is moved to the closed position.
3. The solid-state relays are energized and the main supply
voltage is applied to the top and side heating elements.
NOTE :After cooking, the operation of the fan motors,
damper motor is the same as one of the
convection cooking.
CONVECTION COOKING CONDITION
Touch the CONVECTION pad first and then touch the
Temperature pad. And program desired cooking time by
touching the Number pads. When the START pad is touched,
the following operations occur: (Figure O-3)
1. The numbers on the digital read-out start to count down
to zero.
2. The oven lamp, turntable motor, cooling fan motor and
convection motor are energized.
3. The damper is moved to the closed position.
4. The solid-state relays are energized (if the cavity
temperature is lower than the selected temperature) and
the main supply voltage is applied to the heating elements
to return to the selected cooking temperature.
5. Upon completion of the cooking time, the audible signal will
sound, and oven lamp, turntable motor, cooling fan motor
and convection motor are de-energized. At the end of the
convection cycle, if the cavity air temperature is above
230˚F, the circuit to RY5 will be maintained (by the thermistor
circuit) to continue operation of the cooling fan motor until
the temperature drops below 195˚F, at which time the relay
will be de-energized, turning off the fan motor. Relay RY3
will however, open as soon as the convection cycle has
ended, turning off the convection fan motor.
6. At the end of the convection cook cycle, if the cavity air
temperature is below 250˚F, shut-off relay (RY4) is
energized turning on the damper motor. The damper is
returned to the open position, closing the damper switch
contacts which send a signal to the control unit, deenergizing shut-off relay (RY4).
NOTE: W h e n " P r e h e a t " a n d " C o n v e c t i o n " i s
programmed continuously, after preheat, the
heating elements operate as follows.
When one of 100˚F to 375˚F is selected, for the
first 1 minute, the top and side heating elements
are not energized. When one of 400˚F to 450˚F is
selected, for the first 2 minutes, the top and side
heating elements are not energized.
SPEED ROAST COOKING
Touch the ROAST pad and then enter cooking time. When
the start pad is touched, following operations occur;
(Figure O-5)
1. The contacts of the relays RY1, RY3 and RY5 are
closed, and the oven lamp, turntable motor, convection
motor and fan motors are energized.
NOTE :The rotate direction of the convection motor is
the same as one of the convection cooking for
the first time. But for the last 15 minutes, the
direction is reverse by the relay RY6.
2. The damper is moved to the closed position.
3. The solid-state relays and relay RY2 are energized
alternately, and the main supply voltage is applied to the
top and side heating elements and the power transformer
alternately.
NOTE :After cooking, the operation of the fan motors,
damper motor is the same as one of the
convection cooking.
SPEED COOKING OF AUTOMATIC COOKING
(BASIC COOK, RECIPES)
Speed cooking of Automatic cooking will automatically
compute the oven temperature, microwave power and
cooking time. And the oven will cook according to the special
cooking sequence.
MICROWAVE OPTIONS OF AUTOMATIC COOKING
(REHEAT, POPCORN, COMPU COOK, COMPU DEFROST)
Microwave options of Automatic cooking will automatically
compute the microwave power, cooking time or defrosting
SPEED BAKE COOKING
Touch the BAKE pad and then enter cooking time. When the
start pad is touched, following operations occur;
7
R-90GC
time. And the oven will cook according to the special cooking
sequence.
measurement circuit is sampled by the LSI and twenty
five (25) seconds after the thermistor is cut off the LSI
turns on the convection fan for three (3) seconds.
3. The above procedure is repeated. If the difference between
the first voltage measured (in step 1) and the voltage
measured when the procedure is repeated (step 2) is
greater than 300 mV the LSI makes the judgment that
there is a fire in the oven cavity and will switch off the relays
to the power transformer, fan motor and convection motor.
The LSI also stops counting down and closes the damper
door so that no fresh air will enter the oven cavity.
4. Once the fire sensor feature has shut the unit down, the
programmed cooking cycle may be resumed by pressing
the "START" pad or the unit may be reset by pressing the
"CLEAR" pad.
FIRE SENSING FEATURE (MICROWAVE MODE)
This model incorporates a sensing feature which will stop
the oven's operation if there is a fire in the oven cavity during
microwave cooking. This fire sensing feature will operate
when the microwave power level is set to 80% or more. This
is accomplished by the LSI repeatedly measuring the voltage across the temperature measurement circuit (thermistor) during it's 32-seconds time base comparing the obtained voltage measurements. If the most recent voltage
measured is 300 mV greater than the previous voltage
measured, the LSI judges it as a fire in the oven cavity and
switches off the relays to the power transformer, fan motor
and convection motor. The LSI also stops counting down
and closes the damper door so that no fresh air will enter the
oven cavity. Please refer to the following section for a more
detailed description.
Operation
Please refer to the timing diagrams below.
1. The fire sensing will start after 30 minutes when the oven
is started.
2. The thermistor operates within a 32-seconds time base
and it is energized for three (3) seconds and off for 29
seconds. Two (2) seconds after the thermistor is
energized, the voltage across the temperature
0 23
28
31 32 (sec.)
64 (sec.)
3 sec.
CONVECTION
MOTOR
ON
OFF
3 sec.
THERMISTOR
ON
OFF
ON
Sensing
Voltage OFF
Sensing the voltage across temperature measurement circuit.
SCHEMATIC DIAGRAM
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. CLOCK APPEARS ON DISPLAY.
SECONDARY INTERLOCK SWITCH
Figure O-1. Oven Schematic-OFF Condition
8
MAGNETRON
CAPACITOR
1µ AC 2300V
H.V. RECTIFIER
MONITOR SWITCH
TTM
OL
TURNTABLE MOTOR
SOLID-STATE RELAY
COM.
OVEN LAMP
COM.
CONVECTION MOTOR CAPACITOR
FM
FAN MOTOR
FM
D3
DAMPER MOTOR
D5
E5
DM
B6 D1 D7
E3
CM
B2 B5
CONVECTION
MOTOR
B1
THERMISTOR
B4
DOOR
SENSING
SWITCH
B3
DAMPER
SWITCH
240V ~60Hz
C3
E1
TOP HEATIMG ELEMENT
RY6
SIDE HEATIMG ELEMENT
C4
POWER TRANSFORMER
WITH 160˚C THERMOSTAT
IN PRIMARY WINDING
N.O.
PRIMARY
INTERLOCK RELAY
SOLID-STATE RELAY
C1
RY2
RY4
RY3
CONTROL UNIT
FUSE
F10A
C2
N.O.
D9
COM.
A3 A2 A1
SIDE HEATER
THERMAL
CUT-OUT 150˚C
RY1
A4
TOP HEATER
THERMAL
CUT-OUT 170˚C
RY5
A6
MAGNETRON
TEMPERATURE
FUSE 150˚C
COM.
A8
MONITOR
FUSE 20A
COM.
T/C TRANSFORMER
NOTE: " " indicates components with potential above 250V.
R-90GC
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. COOKING TIME PROGRAMMED.
3. “START” PAD TOUCHED.
MAGNETRON
CAPACITOR
1µ AC 2300V
H.V. RECTIFIER
MONITOR SWITCH
TTM
OL
CONVECTION MOTOR CAPACITOR
TURNTABLE MOTOR
OVEN LAMP
COM.
SOLID-STATE RELAY
COM.
FM
FAN MOTOR
DM
FM
D3
DAMPER MOTOR
D5
E5
CM
B6 D1 D7
E3
CONVECTION
MOTOR
B2 B5
THERMISTOR
B1
DOOR
SENSING
SWITCH
B3
DAMPER
SWITCH
240V ~60Hz
C3
E1
B4
SIDE HEATIMG ELEMENT
RY6
TOP HEATIMG ELEMENT
C4
POWER TRANSFORMER
WITH 160˚C THERMOSTAT
IN PRIMARY WINDING
N.O.
PRIMARY
INTERLOCK RELAY
SOLID-STATE RELAY
C1
RY2
RY4
RY3
CONTROL UNIT
FUSE
F10A
C2
N.O.
D9
RY1
A3 A2 A1
SIDE HEATER
THERMAL
CUT-OUT 150˚C
COM.
A4
TOP HEATER
THERMAL
CUT-OUT 170˚C
COM.
A6
MAGNETRON
TEMPERATURE
FUSE 150˚C
COM.
A8
MONITOR
FUSE 20A
RY5
T/C TRANSFORMER
NOTE: " " indicates components with potential above 250V.
SECONDARY INTERLOCK SWITCH
Figure O-2. Oven Schematic-Microwave Cooking Condition
MONITOR SWITCH
TTM
OL
TURNTABLE MOTOR
SECONDARY INTERLOCK SWITCH
Figure O-3. Oven Schematic-Convection, Reheat, Speed Bake Cooking Condition
9
MAGNETRON
SIDE HEATIMG ELEMENT
SOLID-STATE RELAY
COM.
OVEN LAMP
COM.
CONVECTION MOTOR CAPACITOR
FM
FAN MOTOR
FM
D3
DAMPER MOTOR
D5
E5
DM
B6 D1 D7
E3
CM
B2 B5
CONVECTION
MOTOR
B1
THERMISTOR
B4
DOOR
SENSING
SWITCH
B3
DAMPER
SWITCH
240V ~60Hz
C3
E1
TOP HEATIMG ELEMENT
C4
RY6
CAPACITOR
1µ AC 2300V
H.V. RECTIFIER
SOLID-STATE RELAY
POWER TRANSFORMER
WITH 160˚C THERMOSTAT
IN PRIMARY WINDING
N.O.
FUSE
F10A
C1
RY2
RY4
RY3
CONTROL UNIT
SCHEMATIC (SPED BAKED)
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. BAKED PAD TOUCHED.
3. COOKING TIME PROGRAMMED.
4. “START” PAD TOUCHED.
C2
N.O.
D9
RY1
A3 A2 A1
SIDE HEATER
THERMAL
CUT-OUT 150˚C
COM.
A4
TOP HEATER
THERMAL
CUT-OUT 170˚C
RY5
A6
MAGNETRON
TEMPERATURE
FUSE 150˚C
COM.
A8
MONITOR
FUSE 20A
COM.
T/C TRANSFORMER
SCHEMATIC (SPEED REHEAT)
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. REHEAT PAD TOUCHED.
3. DESIRED TEMPERATURE SELECTED.
4. COOKING TIME PROGRAMMED.
5. “START” PAD TOUCHED.
PRIMARY
INTERLOCK RELAY
SCHEMATIC (CONVECTION)
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. CONVECTION PAD TOUCHED.
3. DESIRED TEMPERATURE SELECTED.
4. COOKING TIME PROGRAMMED.
5. “START” PAD TOUCHED.
R-90GC
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. GRILL PAD TOUCHED.
3. COOKING TIME PROGRAMMED.
4. “START” PAD TOUCHED.
MAGNETRON
CAPACITOR
1µ AC 2300V
H.V. RECTIFIER
MONITOR SWITCH
TOP HEATIMG ELEMENT
TTM
OL
OVEN LAMP
CONVECTION MOTOR CAPACITOR
TURNTABLE MOTOR
COM.
SOLID-STATE RELAY
COM.
FM
FAN MOTOR
DM
FM
D3
DAMPER MOTOR
D5
THERMISTOR
B6 D1 D7
E5
CM
B2 B5
E3
CONVECTION
MOTOR
B1
DOOR
SENSING
SWITCH
B4
B3
DAMPER
SWITCH
240V ~60Hz
C3
E1
SIDE HEATIMG ELEMENT
C4
RY6
POWER TRANSFORMER
WITH 160˚C THERMOSTAT
IN PRIMARY WINDING
N.O.
PRIMARY
INTERLOCK RELAY
SOLID-STATE RELAY
C1
RY2
RY4
RY3
CONTROL UNIT
FUSE
F10A
C2
N.O.
D9
RY1
A3 A2 A1
SIDE HEATER
THERMAL
CUT-OUT 150˚C
COM.
A4
TOP HEATER
THERMAL
CUT-OUT 170˚C
COM.
A6
MAGNETRON
TEMPERATURE
FUSE 150˚C
COM.
A8
MONITOR
FUSE 20A
RY5
T/C TRANSFORMER
NOTE: " " indicates components with potential above 250V.
SECONDARY INTERLOCK SWITCH
Figure O-4. Oven Schematic-Speed Grill Cooking Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. ROAST PAD TOUCHED.
3. COOKING TIME PROGRAMMED.
4. “START” PAD TOUCHED.
SECONDARY INTERLOCK SWITCH
Figure O-5. Oven Schematic-Speed Roast Cooking Condition
10
MAGNETRON
CAPACITOR
1µ AC 2300V
H.V. RECTIFIER
MONITOR SWITCH
TTM
TURNTABLE MOTOR
OL
SOLID-STATE RELAY
COM.
OVEN LAMP
COM.
CONVECTION MOTOR CAPACITOR
FM
FAN MOTOR
FM
D3
DAMPER MOTOR
D5
E5
DM
B6 D1 D7
E3
CM
B2 B5
CONVECTION
MOTOR
B1
THERMISTOR
B4
DOOR
SENSING
SWITCH
B3
DAMPER
SWITCH
240V ~60Hz
C3
E1
TOP HEATIMG ELEMENT
RY6
SIDE HEATIMG ELEMENT
C4
POWER TRANSFORMER
WITH 160˚C THERMOSTAT
IN PRIMARY WINDING
N.O.
PRIMARY
INTERLOCK RELAY
SOLID-STATE RELAY
C1
RY2
RY4
RY3
CONTROL UNIT
FUSE
F10A
C2
N.O.
D9
RY1
A3 A2 A1
SIDE HEATER
THERMAL
CUT-OUT 150˚C
COM.
A4
TOP HEATER
THERMAL
CUT-OUT 170˚C
RY5
A6
MAGNETRON
TEMPERATURE
FUSE 150˚C
COM.
A8
MONITOR
FUSE 20A
COM.
T/C TRANSFORMER
NOTE: The solid-state relays and relay RY2 are energized alternately.
For last 15 minutes, the contacts of relay RY6 will contact D5.
R-90GC
DESCRIPTION AND FUNCTION OF COMPONENTS
DOOR OPEN MECHANISM
secondary interlock switch contacts fail to open, the
monitor fuse blows simultaneously with closing of the
monitor switch contacts.
The door is opened by pulling the door handle down and
forward, referring to the figure D-1. When the door handle is
pulled down, the latch heads are moved upward. And then
when the door handle is pulled forward, the latch heads are
released from the latch hooks right and left. Now, the door
will open.
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE TEST THE DOOR SENSING SWITCH,
PRIMARY INTERLOCK RELAY, SECONDARY
INTERLOCK SWITCH AND MONITOR
SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER “TEST PROCEDURE”).
Monitor switch
Latch hook left
Latch
head
NOTE: MONITOR FUSE AND MONITOR SWITCH ARE
REPLACED AS AN ASSEMBLY.
Secondary
interlock switch
THERMISTOR
Latch hook right
The thermistor is a negative temperature coefficient type.
The temperature in the oven cavity is detected through the
resistance of the thermistor, and then the control unit
causes the heater relay to operate, thus the current to the
heating elements is turned ON/OFF. If the convection
cooking or some cooking modes which use the top / side
heating elements is started and the oven temperature does
not rise above 100˚F (37.8˚C), the control unit will stop the
oven after 10 minutes. In this case, the thermistor may be
opened.
Latch
head
Door handle
Door
sensing switch
MAGNETRON TEMPERATURE FUSE.
Figure D-1. Door Open Mechanism
The temperature fuse located on the waveguide flange is
designed to prevent damage to the magnetron if an over
heated condition develops in the magnetron due to cooling
fan failure, obstructed air guide, dirty or blocked air intake,
etc.
Under normal operation, the temperature fuse remains
closed. However, when abnormally high temperatures are
reached within the magnetron, the temperature fuse will
open at 302˚F(150˚C) causing the oven to shut down.
DOOR SENSING AND SECONDARY INTERLOCK
SWITCHES
The door sensing switch in the primary interlock system is
mounted in the lower position on the latch hook right, the
secondary interlock switch is mounted in the lower position on
the latch hook left. They are activated by the latch heads on the
door. When the door is opened, the switches interrupt the
circuit to all components except for the oven lamp. A cook
cycle cannot take place until the door is firmly closed thereby
activating both interlock switches. The primary interlock system consists of the door sensing switch and primary interlock
relay located on the control circuit board.
TOP HEATER THERMAL CUT-OUT
The thermal cut-out located on the thermal cover upper is
designed to prevent damage to the top heating element unit
if an over heated condition develops in the top heating
element unit due to convection fan failure, thermistor failure,
obstructed air ducts, dirty or blocked air intake, etc.
Under normal operation, the thermal cut-out remains closed.
However, when abnormally high temperature are reached
within the top heating element unit, the thermal cut-out will
open at 338˚F (170˚C) causing the oven to shut down. When
the thermal cut-out has cooled, the thermal cut-out closes at
311˚F(155˚C).
MONITOR SWITCH
The monitor switch is mounted on the upper position of latch
hook left. It is activated (the contacts opened) by the left latch
head 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 and secondary interlock switch fail to open when the door is opened.
Functions:
1. When the door is opened, the monitor switch contact
close (to the ON condition) due to their being normally
closed. At this time the door sensing and secondary
interlock switches are in the OFF condition (contacts
open) due to their being normally open contact switches.
2. As the door goes to a closed position, the monitor switch
contacts are first opened and then the door sensing switch
and the secondary interlock switch contacts close. (On
opening the door, each of these switches operate inversely.)
3. If the door is opened, and the primary interlock relay and
SIDE HEATER THERMAL CUT-OUT
The thermal cut-out located on the thermal cover left is
designed to prevent damage to the side heating element
unit if an over heated condition develops in the top heating
element unit due to convection fan failure, thermistor failure,
obstructed air ducts, dirty or blocked air intake, etc.
Under normal operation, the thermal cut-out remains closed.
However, when abnormally high temperature are reached
within the side heating element unit, the thermal cut-out will
11
R-90GC
open at 302˚F (150˚C) causing the oven to shut down. When
the thermal cut-out has cooled, the thermal cut-out closes at
266˚F (130˚C).
tion time reaches 0, the heating elements are de-energized
and the convection fan stops operating and the oven shuts off.
Flow of hot air:
The rotation direction of the convection motor is controlled
by relay RY6. When the convection fan rotates clockwise,
the hot air from the oven cavity left side wall blows stronger
than one from the oven cavity top wall. ( This mode is called
“Convection mode”.) When the convection fan rotates
counterclockwise, the hot air from the oven cavity top wall
blows stronger than one from the oven cavity left side wall.
(This mode is called “JET mode”.)
TOP HEATING ELEMENT
The top heating element is located at the top of the oven
cavity. It is intended to heat air driven by the convection fan.
The heated air is kept in the oven and force-circulated and
reheated by the top heating element.
SIDE HEATING ELEMENT
The side heating element is located at the left side of the
oven cavity. It is intended to heat air driven by the convection
fan. The heated air is kept in the oven and force-circulated
and reheated by the top heating element.
Top heating
element unit
TURNTABLE MOTOR
The turntable motor rotates the turntable located in the
bottom of the oven cavity, so that the food on the turntable
is cooked evenly during cooking. The turntable may turn in
either direction.
Side heating
element unit
FAN MOTOR (MAGNETRON SIDE)
JET
mode
Convection
fan
The fan motor drives a blade which draws external cool air.
This cool air is directed through the air vents surrounding the
magnetron and cools the magnetron. This air is channelled
through the oven cavity to remove steam and vapors given
off from the heating foods. It is then exhausted through the
exhausting air vents at the oven cavity.
Convection mode
FRONT VIEW
Figure D-2. Rotation direction of convection fan
Oven cavity left side
FAN MOTOR (POWER TRANSFORMER SIDE)
The fan motor drives a blade which draws external cool air.
This cool air is directed through the air vents surrounding the
power transformer and cools the power transformer. This air
is channelled through the oven cavity to remove steam and
vapors given off from the heating foods. It is then exhausted
through the exhausting air vents at the oven cavity.
Hot air
Oven cavity
top wall
Convection
fan
Hot air
CONVECTION COOKING SYSTEM
This oven is designed with a hot air heating system where food
is not directly heated by the heating element, but is heated by
forced circulation of the hot air produced by the heating
elements. The air heated by the heating elements is circulated
through the convection passage provided on the outer casing
of the oven cavity by means of the convection fan which is
driven by the convection motor. It then enters the inside of the
oven through the vent holes provided on the top and left sides
of the oven. Next, the hot air heats the food on the turntable
and leaves the oven cavity through the vent in the center of the
oven cavity back side wall. Without leaving the oven, this hot
air is reheated by the heating elements, passes through the
convection passage and enters the inside of the oven cavity
again, in a continuing cycle. In this way, the hot air circulates
inside the oven cavity to raise its temperature and, at the same
time, comes into contact with the food being cooked. When the
temperature inside the oven cavity reaches the selected
temperature, the heating elements are de-energized. When
the temperature inside the oven cavity drops below the
selected temperature, the heating elements are energized
again. In this way, the inside of the oven cavity is maintained
at approximately the selected temperature. When the convec-
Top heating element unit Top heating element unit
Hot air
Hot air
Side heating
element unit
Side heating
Turntable element unit
Convection Mode
JET Mode
Figure D-3. Flow of hot air
DAMPER OPEN-CLOSE MECHANISM
Usually, the damper is in the open position except during
convection cooking, reheat, speed grill, speed roast, speed
bake, or all cooking modes which use the top / side heating
elements. Damper position is set automatically by damper
motor, damper switch, motor cam and damper shaft. These
components are operated by a signal that judges if microwave cooking, convection cooking operation or other cooking operation is selected by the control unit.
12
R-90GC
control unit and shut-off relay (RY4) is turned off.
1-5. The 240 volts A.C. to the damper motor is removed
and the motor turns off.
2. When oven is microwave cooking:
Damper is in the open position.
3. When oven is convection cooking:
3-1. Damper motor is energized by touching the
convection, temperature and START pads.
3-2. When damper is in the closed position (damper
switch is ON), its signal is sensed by the control unit,
and shut-off relay (RY4) is de-energized.
3-3. The damper is held in the closed position during the
convection cooking operation.
3-4. At the end of the convection cooking, if the cavity air
temperature is below 250˚F, shut-off relay (RY4) is
energized, and the damper is returned to the open
position.
NOTE: If the damper door is not in the proper position,
closed during convection or open during
microwave, the control unit will stop oven
operation after 1 minute.
Microwave Cooking:
Damper is in the open position, because a portion of cooling
air is channelled through the cavity to remove steam and
vapors given off from the heating foods. It is then exhausted
at the top of the oven cavity into a condensation compartment.
Convection, Preheat, Speed Grill, Speed Roast, Speed
Bake, or all cooking modes which use the top / side
heating elements:
Damper is in the closed position, so that no hot air will be
allowed to leak out the oven cavity.
Damper Operation
1. When power supply cord is plugged in:
1-1. When power supply cord is plugged in, a signal is
sensed in the control unit, and operates shut-off
relay (RY4).
1-2. Contacts of shut-off relay (RY4) close, the damper
motor is energized, opening the damper door.
1-3. When the damper is moved to the open position by
the damper cam the damper switch is opened (OFF
position).
1-4. The signal from damper switch is re-sensed in the
TROUBLESHOOTING GUIDE
Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.
When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many
of the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter which
will be found in the "Test Procedure "section.
IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, relay (RY1)
primary interlock relay (RY2), door sensing switch and secondary interlock switch before replacing the
monitor fuse. If the monitor fuse is replaced, the monitor switch must also be replaced. Use part FFSBA033WRKZ 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
2. Remove the outer case cabinet, referring to "OUTER CASE CABINET REMOVAL".
3. Open the door and block it open.
4. Discharge high voltage capacitor.
5. Remove the back plate from the oven, referring to "BACK PLATE REMOVAL".
6. Disconnect the leads to the primary of the power transformer.
7. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
8. After that procedure, reconnect the power supply cord.
When the testing is completed
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect all leads removed from components during testing.
5. Reinstall the outer case (cabinet) and theback plate.
6. Reconnect the power supply cord after the outer case and the back plate are installed.
7. Run the oven and check all functions.
13
A
B
C
D
E
F
G
H
J
K
M
O
P
Q
U
V
W
W
W
W
W
W
Y
Z
X
X
Replace
Replace
Replace
Check
S
Check
Check
Check
L
N
Replace
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
U
I
MAGNETRON
POWER TRANSFORMER
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE CAPACITOR
SECONDARY INTERLOCK SWITCH
PRIMARY INTERLOCK SYSTEM
MONITOR SWITCH
MONITOR FUSE
MAGNETRON TEMPERATURE FUSE
THERMAL CUT-OUT (TOP)
TOP HEATING ELEMENT
THERMISTOR
DAMPER MOTOR
DAMPER SWITCH
TOUCH CONTROL PANEL
TACT SWITCH
RELAY RY-1
RELAY RY-2
RELAY RY-3
RELAY RY-4
RELAY RY-5
RELAY RY-6
COMP. DEFROST
FUSE1 ON PWB.
SOLID-STATE RELAY (TOP)
SOLID-STATE RELAY (SIDE)
OVEN LAMP
FAN MOTOR (MAGNETRON)
TURNTABLE MOTOR
CONVECTION MOTOR
LOOSE WIRING
SHORTED IN POWER CORD
NO POWER AT OUTLET
LOW VOLTAGE
THERMAL CUT OUT (SIDE)
SIDE HEATING ELEMENT
FAN MOTOR (POWER TRANSFORMER)
T/C TRANSFORMER
FUSE F10A
R
CONVECTION MOTOR CAPACITOR
14
Convection motor does not operate of all or properly.
Convection cycle runs for 10 minutes then shuts down.
Temperature in the oven cavity is lower or higher than preset.
Heating elements do not heat.
(MICROWAVE)
Oven does not go into cook cycle when START pad is touched.
Function of COMPU DEFROST does not operate properly.
Function of variable cooking does not operate properly except HIGH
power.
Extremely uneven heating is produced in oven load (food).
COOKING CONDITION
Low or no power is produced during microwave cooking (The food is
heated incompletely or not heated at all)
Oven does not go into a cook cycle, when START pad is touched.
Turntable motor operates normally but cooling fan motor does not
operate.
Oven lamp light, but turntable motor does not operate.
Cooking cycle runs 1 minute then shuts down.
OFF CONDITION
Oven lamp does not light in cook cycle. (It light when door is opened).
Oven lamp does not light with door opened.
Display does not operate properly when STOP/CLEAR pad is touched.
(The time of day should appear on the display with beep sound.)
88:88 does not appear in display when power cord is first plugged into
wall receptacle.
CONDITION
Monitor fuse blows when power cord is plugged into wall receptacle
Home fuse blows when power cord is plugged into wall receptacle.
PROBLEM
TEST PROCEDURE
R-90GC
(CONVECTION, SPEED BAKE/
GRILL/ROAST)
R-90GC
TEST PROCEDURES
PROCEDURE
LETTER
A
COMPONENT TEST
MAGNETRON ASSEMBLY TEST
1.
2.
3.
4.
5.
6.
Disconnect the power supply cord.
Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.
Open the oven door and block it open.
Discharge the high voltage capacitor.
Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.
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.
7. 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.
8. Reconnect all leads removed from components during testing.
9. Reinstall the outer case (cabinet).
10. Reconnect the power supply cord after the outer case is installed.
11. Run the oven and check all functions.
MICROWAVE OUTPUT POWER
The following test procedure should be carried out with the microwave oven in a fully assembled condition
(outer case fitted).
HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE
OBSERVED.
Power output of the magnetron can be measured by performing a water temperature rise test. This test should
only be used if above tests do not indicate a faulty magnetron and there is no defect in the following
components or wiring: silicon rectifier, high voltage capacitor and power transformer. This test will require a
16 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple type temperature
tester. For accurate results, the following procedure must be followed carefully:
1. Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water with a
thermometer or thermocouple temperature tester. Stir the thermometer or thermocouple through the water
until the temperature stabilizes. Record the temperature of the water.
2. Place the cup of water in the oven. Operate oven at HIGH POWER (100%) selecting more than 60 seconds
cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second hand of a watch
or the digital read-out countdown.
3. Remove the cup from the oven and again measure the temperature, making sure to stir the thermometer
or thermocouple through the water until the maximum temperature is recorded.
4. Subtract the cold water temperature from the hot water temperature. The normal result should be 29.5 to
54.9˚F(16.4 to 30.5˚C) rise in temperature. If the water temperatures are accurately measured and tested
for the required time period the test results will indicate if the magnetron tube has low power output (low
rise in water temperature) which would extend cooking time or high power output (high rise in water
temperature) which would reduce cooking time. Because cooking time can be adjusted to compensate for
power output, the magnetron tube assembly should be replaced only if the water temperature rise test
indicates a power output well beyond the normal limits. The test is only accurate if the power supply line
voltage is 240 volts and the oven cavity is clean.
B
POWER TRANSFORMER TEST
1.
2.
3.
4.
5.
6.
Disconnect the power supply cord.
Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.
Open the oven door and block it open.
Discharge the high voltage capacitor.
Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.
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 approximately 1.3 ohms and the resistance of the high voltage coil should be approximately 75
ohms; the resistance of the filament coil should be less than 1 ohm.
7. Also, the power transformer has the thermostat in the primary coil. Measure the resistance of the primary
coil. The resistance of the primary coil should be above resistance unless the temperature of the thermostat
in the primary coil reaches approximately 320˚F (160˚C). The thermostat resets automatically at
221˚F(105˚C). If an ohmmeter indicates an open circuit under normal condition, replace the power
15
R-90GC
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
transformer because the primary coil (thermostat) has opened. An open primary coil (thermostat) indicates
overheating of the power transformer. Check for restricted air flow to the power transformer, especially the
fan motor (power transformer side).
8. Reconnect all leads removed from components during testing.
9. Reinstall the outer case (cabinet) and the back plate.
10.Reconnect the power supply cord after the outer case and the back plate are installed.
11.Run the oven and check all functions.
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)
C
HIGH VOLTAGE RECTIFIER TEST
1.
2.
3.
4.
5.
6.
Disconnect the power supply cord.
Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.
Open the oven door and block it open.
Discharge the high voltage capacitor.
Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.
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.
7. Reconnect all leads removed from components during testing.
8. Reinstall the outer case (cabinet) and back plate.
9. Reconnect the power supply cord after the outer case and the back plate are installed.
10.Run the oven and check all functions.
NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts.
D
HIGH VOLTAGE CAPACITOR TEST
1.
2.
3.
4.
5.
6.
Disconnect the power supply cord.
Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.
Open the oven door and block it open.
Discharge the high voltage capacitor.
Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.
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.
7. Reconnect all leads removed from components during testing.
8. Reinstall the outer case (cabinet) and the back plate.
9. Reconnect the power supply cord after the outer case and the back plate are installed.
10.Run the oven and check all functions.
E
SECONDARY INTERLOCK SWITCH TEST
1.
2.
3.
4.
5.
6.
7.
8.
9.
Disconnect the power supply cord.
Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.
Open the oven door and block it open.
Discharge the high voltage capacitor.
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of
the switch. The meter should indicate an open circuit with the door open and a closed circuit with the door
closed. If improper operation is indicated, replace the secondary interlock switch.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
16
R-90GC
TEST PROCEDURES
PROCEDURE
LETTER
F
COMPONENT TEST
PRIMARY INTERLOCK SYSTEM TEST
DOOR SENSING SWITCH
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of
the switch. The meter should indicate an open circuit with the door open and a closed circuit with the door
closed. If improper operation is indicated, replace the door sensing switch.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
NOTE: If the door sensing switch contacts fail in the open position and the door is closed, the turntable
motor and oven light will be activated by RY1.
PRIMARY INTERLOCK RELAY (RY2)
1.
2.
3.
4.
5.
6.
7.
8.
G
MONITOR SWITCH
1.
2.
3.
4.
5.
6.
7.
8.
H
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Disconnect two (2) wire leads from the male tab terminals of the Primary Interlock Relay (RY2). 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.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Before performing this test, make sure that the secondary interlock switch and the primary interlock relay
are operating properly, according to the above Switch Test Procedure. Disconnect the wire lead from the
monitor switch (COM) terminal. Check the monitor switch operation by using the ohmmeter as follows.
When the door is open, the meter should indicate a closed circuit. When the monitor switch actuator is
pushed by a screw driver through the lower latch hole on the front plate of the oven cavity with the door
opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open
circuit. If improper operation is indicated, the
switch may be defective. After testing the monitor
GRY
BLK
switch, reconnect the wire lead to the monitor
switch (COM) terminal and check the continuity
of the monitor circuit.
Reconnect all leads removed from components
Monitor switch
during testing.
OHMMETER
Screw driver
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer
case is installed.
Secondary
interlock switch
Run the oven and check all functions.
Latch hook left
BLOWN MONITOR FUSE
1.
2.
3.
4.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary interlock
switch and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the
blown monitor fuse.
CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK
17
R-90GC
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
RELAY, SECONDARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND MONITOR
SWITCH FOR PROPER OPERATION.
If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch must be
replaced with "monitor fuse and monitor switch assembly" part number FFS-BA033WRKZ, even if the monitor
switch operates normally. The monitor fuse and monitor switch assembly is comprised of a 20 ampere fuse
and switch.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
I
BLOWN FUSE F10A
1.
2.
3.
4.
5.
6.
7.
8.
7.
8.
Disconnect the power supply cord.
Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.
Open the oven door and block it open.
Discharge the high voltage capacitor.
Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.
If the monitor fuse is blown, there could be short or ground in high voltage rectifier, magnetron, power
transformer, high voltage capacitor or high voltage wire. Check them and replace the defective parts or
repair the wire harness.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet) and the back plate.
Reconnect the power supply cord after the outer case and back plate are installed.
Run the oven and check all functions.
CAUTION: ONLY REPLACE FUSE F10A WITH CORRECT VALUE REPLACEMENT.
J
MAGNETRON TEMPERATURE FUSE TEST
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
A continuity check across the temperature fuse terminals should indicate a closed circuit unless the
temperature of the magnetron reaches approximately 302˚F(150˚C). An open temperature fuse indicates
overheating of the magnetron. Check for restricted air flow to the magnetron, especially the cooling duct
and cooling fan.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE TEMPERATURE FUSE.
K
THERMAL CUT-OUT (TOP HEATER) TEST
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the
temperature of the thermal cut-out reaches approximately 338˚F(170˚C). The thermal cut-out resets
automatically at approximately 311˚F(155˚C). If thermal cut-out has opened under normal condition,
replace the same item as in the parts list.
An open thermal cut-out indicates overheating of the top heating element unit. Check for restricted air flow
to the top heat element unit through the vent holes of the oven cavity, especially the heater duct upper and
convection fan.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
18
R-90GC
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE,
REPLACE THERMAL CUT-OUT.
L
THERMAL CUT-OUT (SIDE HEATER) TEST
1.
2.
3.
4.
5.
6.
7.
8.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the
temperature of the thermal cut-out reaches approximately 302˚F(150˚C). The thermal cut-out resets
automatically at approximately 266˚F(130˚C). If thermal cut-out has opened under normal condition,
replace the same item as in the parts list.
An open thermal cut-out indicates overheating of the side heating element unit. Check for restricted air flow
to the side heat element unit through the vent holes of the oven cavity, especially the heater duct left and
convection fan.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE,
REPLACE THERMAL CUT-OUT.
M
TOP HEATING ELEMENT TEST
1.
2.
3.
4.
5.
6.
7.
8.
9.
N
SIDE HEATING ELEMENT TEST
1.
2.
3.
4.
5.
6.
7.
8.
9.
O
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Make sure the heating element is fully cooled and test as follows;
a. Disconnect wire leads from the heating element and measure the resistance with an ohmmeter. On the R
x 1 scale, the resistance between the heating element terminals should be approximately 32.7Ω.
b. Disconnect wire leads from the heating element and measure the insulation resistance with 500V 100MΩ insulation resistance meter. The insulation resistance between heating element terminal and
cavity should be more than 0.5MΩ.
If the meter does not indicate above resistance, replace the top heating element.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Make sure the heating element is fully cooled and test as follows;
a. Disconnect wire leads from the heating element and measure the resistance with an ohmmeter. On the R x 1 scale,
the resistance between the heating element terminals should be approximately 46.5 Ω.
b. Disconnect wire leads from the heating element and measure the insulation resistance with 500V 100MΩ insulation resistance meter. The insulation resistance between heating element terminal and
cavity should be more than 0.5MΩ.
If the meter does not indicate above resistance, replace the top heating element.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
THERMISTOR TEST
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.
19
R-90GC
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
3.
4.
5.
6.
Open the oven door and block it open.
Discharge the high voltage capacitor.
Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.
Disconnect connector-E from the control unit. Measure the resistance of the thermistor with an ohmmeter.
Connect the ohmmeter leads to Pin No’s E-5 and E-6.
Room Temperature
68˚F(20˚C) - 86˚F(30˚C)
Resistance
Approx. 360 kΩ - 152 KΩ
7. If the meter does not indicate above resistance, replace the thermistor.
8. Reconnect all leads removed from components during testing.
9. Reinstall the outer case (cabinet).
10.Reconnect the power supply cord after the outer case is installed.
11.Run the oven and check all functions.
P
DAMPER MOTOR TEST
When the power cord is plugged into the wall receptacle and 240 volts A.C. is supplied to the damper
motor, the motor operates until the damper is opened and the damper switch closes. Then the damper
motor stops operation.
If the damper motor does not operate, check for A.C. voltage with a voltmeter at the motor.
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.
6. Disconnect the leads to the primary of the power transformer.
7. Ensure that the leads remain isolated from other components and oven chassis by using insulation
tape.
8. Disconnect the wire leads of motor and connect the meter leads to the wire leads of main wire harness.
9. Reconnect the power cord into the wall receptacle.
10.If 240 volts A.C. is indicated at the wire leads, replace the motor and if 240 volts A.C. is not indicated,
check the wire harness and control unit.
11.Disconnect the power supply cord.
12.Open the door and block it open.
13.Discharge high voltage capacitor.
14.Reconnect all leads removed from components during testing.
15.Reinstall the outer case (cabinet ) and the back plate.
16.Reconnect the power supply cord after the outer case and the back plate are installed.
17.Run the oven and check all functions.
Q
DAMPER SWITCH TEST
1.
2.
3.
4.
5.
6.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Disconnect the leads to the primary of the power transformer.
Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
Disconnect the wire leads from the switch terminals and connect ohmmeter leads to the common (COM.)
and normally open (N.O.) terminals of the switch.
6-1. When switch actuator is pushed by the damper motor cam, the meter should be indicated a closed circuit.
6-2. When power cord is plugged into the wall receptacle, the damper motor operates and damper cam will start
to rotate. When the switch actuator is released, the meter should be indicated an open circuit.
7. If improper operation is indicated, replace the damper switch.
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.Reinstall 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
R-90GC
TEST PROCEDURES
PROCEDURE
LETTER
R
COMPONENT TEST
CONVECTION MOTOR CAPACITOR TEST
1.
2.
3.
4.
5.
6.
7.
8.
S
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Disconnect input leads and check for short or open between the terminals using an ohmmeter.
Checking with a high ohm scale, if the 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 the terminals. If it is shorted, replace the
capacitor.
Reconnect all leads removed from components during testing.
Reinstall the outer case (cabinet) and the back plate.
Reconnect the power supply cord after the outer case and the back plate are installed.
Run the oven and check all functions.
CONVECTION MOTOR TEST
1.
2.
3.
4.
5.
6.
Disconnect the power supply cord.
Remove the outer case cabinet, referring to “OUTER CASE CABINET REMOVAL”.
Open the oven door and block it open.
Remove the back plate from the oven, referring to “BACK PLATE REMOVAL”.
Disconnect the 3-pin connector of the convection motor from the main wire harness.
Measure the resistance of the convection motor with an ohmmeter.
The resistance of the main coil, across the black and the red wires, should be approximately 130 ohms.
The resistance of the sub coil, across the black and the white wires, should be approximately 140 ohms.
7. Also, the convection motor has the thermal cut-out in it.
Measure the resistance of the main coil (or the sub coil). The resistance across the black and the red wires
(or across the black and the white wires) should be above resistance unless the temperature of the thermal
cut-out reaches approximately 266˚F (130˚C). The thermal cut-out resets automatically at 212˚F (100˚C).
If an ohmmeter indicates an open circuit under normal condition, replace the convection motor because
the thermal cut-out has opened. An open thermal cut-out indicates overheating of the convection motor.
Check for restricted air flow to the convection
motor or a lock of the convection fan, especially
3-pin
Connector
the fan motor (power transformer side).
Main Coil
8. R e c o n n e c t a l l l e a d s r e m o v e d f r o m
BLK
Thermal
components during testing.
RED
130Ω
Cut-out
9. Reinstall the outer case (cabinet) and the
WHT
back plate.
140Ω
10. Reconnect the power supply cord after the
130˚C OFF
outer case and the back plate are installed.
100˚C ON
Sub Coil
11. Run the oven and check all functions.
CONVECTION MOTOR
T
CHECKING TEMPERATURE IN THE CONVECTION MODE
The following test procedure should be carried out with the microwave oven is a fully assembled
condition (outer case fitted).
It is difficult to measure the exact temperature in the convection oven. An accurate thermocouple type
temperature tester must be used. A low priced bi-metal type thermometer is not reliable or accurate.
The temperature should be checked with outer case cabinet installed, approx. 5 minutes after preheat
temperature is reached (audible signal sounds four times). The temperature experienced may be approx. 30˚F
more or less than indicated on the display, however, in most cases the food cooking results will be satisfactory.
Difference in power supply voltage will also affect the oven temperature. The Household power supply voltage
may sometimes become lower than the rated voltage (240 V) and cause under-cooking. If the power supply
voltage is 10% lower than the rated voltage, longer cooking time is required by 10% to 20%.
U
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.
21
R-90GC
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
In this service manual, troubleshooting by unit replacement is described according to the symptoms indicated.
Before testing,
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power transformer.
5) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
1. Tact switch
NOTE ;
1) Re-install the outer case (cabinet).
2) Reconnect the power supply cord after the outer case is installed.
3) Run the oven and check all functions.
The following symptoms indicate a defective tact switch.
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 tact switch 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 tact 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.
2. Control Unit
The following symptoms indicate a defective control unit. Before replacing the control unit, perform the
tact switch test (Procedure Q) to determine if control unit is faulty. Reconnect the power supply cord. And
check for followings.
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.
V
TACT SWITCH TEST
1.
2.
3.
4.
5.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
By using an ohmmeter, check the tact switch operation.
When the tact switch is not depressed, an ohmmeter should indicate an open circuit. When the tact switch
is depressed, an ohmmeter should indicate a short circuit. If improper operation is indicated, the tact switch
is probably defective and should be checked.
22
R-90GC
TEST PROCEDURES
PROCEDURE
LETTER
W
COMPONENT TEST
RELAY TEST
1.
2.
3.
4.
5.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Disconnect the leads to the primary of the power transformer.
Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between Pin Nos. 1 and 9 of the 5 pin connector (CN-D)
on the control unit with an A.C. voltmeter. The meter should indicate 240 volts, if not check oven circuit.
Shut-off, Cook and Heater Relays Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation, speed
grill, speed roast, speed bake, or convection cooking condition.
DC. voltage indicated ............... Defective relay.
DC. voltage not indicated ........... Check diode which is connected to the relay coil. If diode is good,
control unit is defective.
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
Approx. 27.0V D.C.
Oven lamp / Turntable motor
RY2 (COOK)
Approx. 25.0V D.C.
Power transformer
RY3
Approx. 25.0V D.C.
Convection motor
RY4
Approx. 25.0V D.C.
Damper motor
RY5
Approx. 25.0V D.C.
Fan motor
RY6
Approx. 25.0V D.C.
Convection motor
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.
X
SOLID-STATE RELAY TEST
1.
2.
3.
4.
5.
Disconnect the power supply and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Disconnect the wire leads from the solid-state relay.
Measure the resistance between the terminals as described in the following table, with an ohmmeter.
Terminals
Between 1 and 2
Between 3 and 4
Resistance
Approx. 50MΩ
Approx. 1.3MΩ
6. If the meter does not indicate above resistance, replace the solid-state relay.
7. Reconnect all leads removed from components during testing.
8. Re-install the outer case (cabinet).
9. Reconnect the power supply cord after the outer case is installed.
10.Run the oven and check all functions.
Y
1
2
3
4
Solid-state relay
COMPU DEFROST TEST
WARNING : The oven should be fully assembled before following procedure.
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the Compu Defrost pad and select “ Steaks/Chops ” by touching Up/Down
23
R-90GC
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
arrows. 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
Steaks/Chops
0.5lbs
1ST STAGE
LEVEL TIME
70%
17sec.
2ND STAGE
3RD STAGE
LEVEL TIME LEVEL
TIME
60%
30sec.
30% 45sec.
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
Z
PROCEDURES TO BE TAKEN WHEN THE FUSE 1 ON THE PRINTED WIRING BOARD (PWB)
IS OPEN.
To protect the electronic circuits, this model is provided with a fuse added to the primary on the PWB.
1. Fuse 1 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) If the Fuse 1 is blown, replace it.
5) Make a visual inspection of the varistor. Check for burned damage and examine the transformer
with a tester for the presence of layer short-circuit (check the primary coil resistance which is
approximately 275Ω ± 10%). If any abnormal condition is detected, replace the defective parts.
6) Reconnect all leads removed from components during testing.
7) Re-install the outer case (cabinet).
8) Reconnect the power supply cord after the outer case is installed.
9) Run the oven and check all functions.
2. Follow the troubleshooting guide given below, if indicator does not light up after above check and
repairs are finished.
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power transformer.
5) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
6) After that procedure, re-connect the power supply cord.
7) Follow the troubleshooting guide given below for repair.
STEPS
8)
9)
10)
11)
12)
13)
14)
OCCURRENCE
CAUSE OR CORRECTION
1
The rated AC voltage is not present to power
terminal of CPU connecter (CN-D).
Check supply voltage and oven power cord.
2
The rated AC voltage is present at primary
side of low voltage transformer.
Low voltage transformer or secondary circuit defective.
Check and repair.
Disconnect the power supply cord, and then remove outer case.
Open the door and block it open.
Discharge high voltage capacitor.
Reconnect all leads removed from components during testing.
Re-install the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all functions.
24
R-90GC
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
The touch control section consists of the following units
as shown in the touch control panel circuit.
5) Buzzer Circuit
The buzzer is responds to signals from the LSI to emit
noticing sounds (tact switch touch sound and completion
sound).
6) Temperature Measurement Circuit : (OVEN
THERMISTOR)
The temperature in the oven cavity is sensed by the
thermistor. The variation of resistance according to sensed
temperature is detected by the temperature measurement
circuit and the result applied to LSI. The LSI uses this
information to control the relay and display units.
(1) Tact switch circuit on the CPU unit.
(2) Control Unit (The control unit consists of Power unit and
CPU unit.)
The principal functions of these units and the signals communicated among them are explained below.
Tact Switch Circuit
The tact switch circuit is composed of a matrix, signals AN0AN7 generated in the LSI are sent to the tact switches.
When a tact switch is touched, a signal is completed through
the tact switch circuit and passed back to the LSI through
PB0-PB3 to perform the function that was requested.
7) Relay Operation Watching Circuit
This circuit watches so that the three (3) relays for the top
heating element, the side heating element and the
power transformer do not operate at the same time.
Control Unit
Control unit consists of LSI, power source circuit, synchronizing signal circuit, reset circuit, buzzer circuit, temperature
measurement circuit, relay watching circuit, input voltage
circuit and indicator circuit.
8) Input Voltage Watching Circuit
This circuit watches the primary input voltage.
1) LSI
This LSI controls the temperature measurement signal,
tact switch strobe signal, relay driving signal and indicator
signal. And also LSI watches the relay operation and the
primary input voltage.
10) Relay Circuit
To drive the magnetron, heating element, fan motor,
convection motor, damper motor, turntable motor and
light the oven lamp.
9) Door Sensing Switch
A switch to inform the LSI if the door is open or closed.
11) Indicator Circuit
Indicator element is a Fluorescent Display.
Basically, a Fluorescent Display is 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.
The Fluorescent Display has 10-digits, 42-segments are
used for displaying figures.
2) Power Source Circuit
This circuit generates the voltages necessary for the
control unit from the AC line voltage.
3) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit. It incorporates a very small error because it works
on commercial frequency.
12) LED Circuit
A circuit to drive the Light-emitting diodes ( LD1-LD11).
4) Reset Circuit
A circuit to generate a signals which resetting the LSI to
the initial state when power is applied.
13) Damper Switch
A switch to tell the LSI if the damper is open or close.
DESCRIPTION OF LSI
LSI(IXA156DR):
The I/O signals of the LSI(IXA156DR) are detailed in the following table.
Pin No.
Signal
I/O
2
AN4
OUT
3
AN3
OUT
4
AN2
OUT
Description
Tact switch strobe signal. ............................ Signal applied to tact switch section.
LED driving signal. ............ Signal is applied to the Light-emitting diodes (LD4-5).
Tact switch strobe signal. ............................ Signal applied to tact switch section.
LED driving signal. ................. Signal is applied to the Light-emitting diode (LD3).
Tact switch strombe signal. ......................... Signal applied to tact switch section.
25
R-90GC
Pin No.
Signal
I/O
5
AN1
OUT
6
AN0
OUT
7
AN15
IN
AN14-AN12
AN11
IN
IN
12
AN10
IN
13
AN9
IN
14
AN8
IN
Relay operation watching terminal.
The LSI is watching so that the three (3) relays for the top heating element, the side
heating element and the power transformer do not operate at the same time.
15
P83
OUT
16
P82
OUT
Timing signal output terminal for temperature measurement(OVEN THERMISTOR).
“L” level (-5V) : Thermistor OPEN timing.
“H” level (GND) : Temperature measuring timing.(Convection cooking,Speed grill
cooking, Speed roast cooking, Speed bake cooking or preheat)
Oven lamp and turntable motor driving signal. (Square Waveform : 60Hz)
To turn on and off the shut-off relay(RY1).
The square waveform voltage is delivered to
the relay(RY1) driving circuit.
8-10
11
Description
Tact switch strobe signal. ............................ Signal applied to tact switch section.
LED driving signal. ................. Signal is applied to the Light-emitting diode (LD2).
Tact switch strobe signal. ............................ Signal applied to tact switch section.
LED driving signal. ................. Signal is applied to the Light-emitting diode (LD1).
Primary input voltage watching terminal.
The LSI is watching the primary input voltage through this terminal.
Input terminal to change the specification according to the model.
Temperature measurement input: OVEN THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
Input signal which communicates the door open/close information to LSI.
Door closed; “H” level signal(0V).
Door opened; “L” level signal(-5V).
Input signal which communicates the damper open/close information to LSI.
Damper closed; “H” level signal(0V:GND).
Damper opened; “L” level signal(-5V).
16.7 msec.
H
L
During cooking
17
CNVSS
IN
Power source voltage: -5V.
VC voltage of power source circuit input.
18
RESET
IN
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.
19
P81
OUT
Top heating element driving signal.
To operate the solid-state relay for driving the top heating element.
20
P80
OUT
Side heating element driving signal.
To operate the solid-state relay for driving the top heating element.
21
VSS
IN
22
XIN
IN
23
XOUT
OUT
24
VCC
IN
25
P77
OUT
Power source voltage: -5V.
VS voltage of power source circuit input.
Internal clock oscillation frequency setting input.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Power source voltage: 0V.
VC voltage of power source circuit input. Connected to GND.
0.1 sec
Signal to sound buzzer.
A: Tact switch touch sound.
A
2.0 sec
B: Completion sound.
B
C: When the oven stops so that the food
1.0 sec
1.0 sec
can be checked in Automatic cooking
H: GND
C
mode.
L
26
R-90GC
Pin No.
26
27
28
Signal
I/O
P76
OUT
P75
P74
OUT
OUT
29
P73
OUT
30
31
P72
P71
OUT
IN
Description
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 microwave cooking and “H” level
while not cooking. In other cooking 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.
Microwave cooking mode
VARI MODE
Microwave cooking with
other cooking mode
ON TIME OFF TIME ON TIME OFF TIME
P-HI (100% power)
32 sec.
0 sec.
48sec.
0ec.
P-90 (approx. 90% power)
30 sec.
2 sec.
44sec.
4sec.
P-80 (approx. 80% power)
26 sec.
6 sec.
40sec.
8sec.
P-70 (approx. 70% power)
24 sec.
8 sec.
36sec.
12sec.
P-60 (approx. 60% power)
22 sec.
10 sec.
32sec.
16sec.
P-50 (approx. 50% power)
18 sec.
14 sec.
26sec.
22sec.
P-40 (approx. 40% power)
16 sec.
16 sec.
22sec.
26sec.
P-30 (approx. 30% power)
12 sec.
20 sec.
16sec.
32sec.
P-20 (approx. 20% power)
8 sec.
24 sec.
12sec.
36sec.
P-10 (approx. 10% power)
6 sec.
26 sec.
8sec.
40sec.
P-0 (0% power)
0 sec.
32 sec.
0sec.
48sec.
Cooling fan motor driving signal.
To turn on and off shut-off relay(RY5). “L” level
during both microwave and convection cooking; “H”
level otherwise
Damper motor relay driving signal.
To turn on and off shut-off relay(RY4).
During
cooking
ON
OFF
L
OFF
ON
H. GND
H : GND
L
Convection motor driving signal.
H. GND
During
To turn on and off shut-off relay(RY3). “L”level during
OFF
cooking
(Convection)
CONVECTION, SPEED GRILL, SPEED ROAST,
ON
L
SPEED BAKE or PREHEAT; “H” level otherwise
Control signal to turn over the rotatory direction of the convection motor.
Signal to synchronize LSI with commercial power source frequency.
H : GND
This is the basic timing for all real time
processing of LSI.
L (-5V)
16.7 msec.
32
33
34
35
36
37-88
89
P70
P67
P66
P65
P64
FLD51-FLD0
VEE
IN/OUT
OUT
IN
OUT
IN/OUT
OUT
IN
Memory (EEPROM) data input/output.
Terminal to input the program to LSI.
Terminal to input the program to LSI.
Memory (EEPROM) clock out.
Terminal to input the program to LSI.
Segment data signals.
The relation between signals and indicator are as follows:
Signal (Pin No.) Segment (Pin No.)
Signal (Pin No.) Segment (Pin No.)
FLD 0 (88) --------------- 10G(45)
FLD 1 (87) ---------------- 9G (46)
FLD 2 (86) ---------------- 8G (47)
FLD 3 (85) ---------------- 7G (48)
FLD 4 (84) ---------------- 6G (49)
FLD 5 (83) ---------------- 5G (50)
FLD 6 (82) ---------------- 4G (51)
FLD 7 (81) ---------------- 3G (52)
FLD 8 (80) ---------------- 2G (53)
FLD 9 (79) ---------------- 1G (54)
FLD10 (78) ---------------- P1 (59)
FLD11 (77) ---------------- P2 (60)
FLD12 (76) ---------------- P3 (61)
FLD13 (75) ---------------- P4 (62)
FLD14 (74) ---------------- P5 (63)
FLD15 (73) ---------------- P6 (64)
FLD16 (72) ---------------- P7 (65)
FLD17 (71) ---------------- P8 (66)
FLD 18 (70) ---------------- P9 (67)
FLD 19 (69) --------------- P10 (68)
FLD 20 (68) --------------- P11 (69)
FLD 21 (67) --------------- P12 (70)
FLD 22 (66) --------------- P13 (71)
FLD 23 (65) --------------- P14 (72)
FLD 24 (64) ---------------- P42 (7)
FLD 25 (63) ---------------- P41 (8)
FLD 26 (62) ---------------- P40 (9)
FLD 27 (61) --------------- P39 (10)
FLD 28 (60) --------------- P38 (11)
FLD 29 (59) --------------- P37 (12)
FLD 30 (58) --------------- P36 (13)
FLD 31 (57) --------------- P35 (14)
FLD 32 (56) --------------- P34 (15)
FLD 33 (55) --------------- P33 (16)
FLD 34 (54) --------------- P32 (17)
FLD 35 (53) --------------- P31 (18)
Signal(Pin No.)
Segment(Pin No.)
FLD 36 (52) --------------- P30 (19)
FLD 37 (51) --------------- P29 (20)
FLD 38 (50) --------------- P28 (21)
FLD 39 (49) --------------- P27 (22)
FLD 40 (48) --------------- P26 (23)
FLD 41 (47) --------------- P25 (24)
FLD 42 (46) --------------- P24 (25)
FLD 43 (45) --------------- P23 (26)
FLD 44 (44) --------------- P22 (27)
FLD 45 (43) --------------- P21 (28)
FLD 46 (42) --------------- P20 (29)
FLD 47 (41) --------------- P19 (30)
FLD 48 (40) --------------- P18 (31)
FLD 49 (39) --------------- P17 (32)
FLD 50 (38) --------------- P16 (33)
FLD 51 (37) --------------- P15 (34)
Anode (segment) of Fluorescent Display light-up voltage: -30V.
VEE voltage of power source circuit input.
27
R-90GC
Pin No.
Signal
I/O
90
91
PB6
PB5
OUT
OUT
92
PB4
OUT
PB3-PB0
AVSS
IN
IN
98
VREF
IN
99
AN7
OUT
100
AN6
OUT
93-96
97
Description
Terminal not used.
LED driving signal.
Signal is applied to the light-emitting diodes (LD1, LD2, LD3, LD5, LD7, LD9 and
LD11).
LED driving signal.
Signal is applied to the light-emitting diodes (LD4, LD6, LD8 and LD10).
Signal coming from tact switch.
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI.
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V)
Tact switch strobe signal. ............................ Signal applied to tact switch section.
LED driving signal. ........ Signal is applied to the Light-emitting diodes (LD10-11).
Tact switch strobe signal. ............................ Signal applied to tact switch section.
LED driving signal. ............ Signal is applied to the Light-emitting diodes (LD8-9).
TOUCH CONTROL PANEL SERVICING
1. Precautions for Handling Electronic Components
(1) Servicing the touch control panel with power supply
of the oven:
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE DURING SERVICING AND PRESENTS A HAZARD.
This unit uses CMOS LSI in the integral part of the circuits.
When handling these parts, the following precautions should
be strictly followed. CMOS LSI have extremely high impedance at its input and output terminals. For this reason, it is
easily influenced by the surrounding high voltage power
source, static electricity charge in clothes, etc. and sometimes it is not fully protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap them in
aluminium foil. Also wrap all PW boards containing them in
aluminium foil.
2) When soldering, ground the technician as shown in the
figure and use grounded soldering iron and work table.
Therefore, before checking the performance of the touch
control panel,
1) Disconnect the power supply cord, and then remove
outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power transformer.
5) Ensure that these leads remain isolated from other
components and oven chassis by using insulation tape.
6) After that procedure, re-connect the power supply cord.
After checking the performance of the touch control panel,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) Re-connect the leads to the primary of the power transformer.
4) Re-install the outer case (cabinet).
5) Re-connect the power supply cord after the outer case is
installed.
6) Run the oven and check all functions.
A. On some models, the power supply cord between the touch
control panel and the oven itself is so short that the two can’t
be separated. For those models, check and repair all the
controls (sensor-related ones included) of the touch control
panel while keeping it connected to the oven.
B. On some models, the power supply cord between the touch
control panel and the oven proper is long enough that they
may be separated from each other. For those models, it is
possible to check and repair the controls of the touch control
approx. 1M ohm
2. Shapes of Electronic Components
C
I
O
Regulator
KIA79L05P
E
CB
Transistor
DTA123ES
DTA143ES
DTD143ES
KRA101M
KRA117M
KRA223M
KRC101M
KRC243M
3. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the touch
control panel of the microwave oven and the precautions
you must take when doing so. To perform the servicing,
power to the touch control panel is available either from the
power line of the oven itself or from an external power
source.
28
R-90GC
4. Servicing Tools
panel while keeping it apart from the oven proper; in this
case you must short both ends of the door sensing switch
(on PWB) of the touch control panel with a jumper, which
activates an operational state that is equivalent to the oven
door being closed. As for the sensor-related controls of the
touch control panel, checking them is possible if dummy
resistor(s) with resistance equal to that of the controls are
used.
Tools required to service the touch control panel assembly.
1) Soldering iron: 60W
(It is recommended to use a soldering iron with a grounding
terminal.)
2) Oscilloscope: Single beam, frequency range: DC-10MHz
type or more advanced model.
3) Others: Hand tools
(2) Servicing the touch control panel with power supply
from an external power source:
5. Other Precautions
Disconnect the touch control panel completely from the
oven proper, and short both ends of the door sensing switch
(on PWB) of the touch control panel, which activates an
operational state that is equivalent to the oven door being
closed. Connect an external power source to the power
input terminal of the touch control panel, then it is possible
to check and repair the controls of the touch control panel
it is also possible to check the sensor-related controls of the
touch control panel by using the dummy resistor(s).
1) Before turning on the power source of the control unit,
remove the aluminium foil applied for preventing static
electricity.
2) Connect the connectors of the key unit to the control unit
being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that abnormal
voltage due to static electricity etc. is not applied to the input
or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to PWB,
making sure that all connections are tight.
5) Be sure to use specified components where high precision
is required.
PRECAUTIONS FOR USING LEAD-FREE SOLDER
1. Employing lead-free solder
“Main PWB” of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the
PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder.
Example:
Sn-Ag-Cu
Indicates lead-free solder of tin, silver and copper.
2. Using lead-free wire solder
When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional lead
wire solder may cause damage or accident due to cracks.
As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40˚C, we recommend you to
use a dedicated soldering bit.
3. Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is about 220˚C which is higher than the conventional lead solder
by 40˚C, and as it has poor solder wettability, you may be apt to keep the soldering bit in contact with the PWB for
extended period of time. However, since the land may be peeled off or the maximum heat-resistance temperature of
parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady soldering condition.
Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to turn on and
off the power of the bit as required.
If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit after every
use of it.
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.
29
R-90GC
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING AGAINST HIGH VOLTAGE:
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may
result in severe, possibly fatal, electric shock.
(Example)
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
WARNING:
Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
1. Disconnect the power supply cord.
2. Make sure that a definite” click” can be heard when the
microwave oven door is unlatched. (Pull down the door
handle in a closed position with one hand, then push the
door with the other, this causes the latch leads to rise,
it is then possible to hear a “click’ as the door switches
operate.)
3. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
1.
2.
3.
4.
5.
6.
Door does not close firmly.
Door hinge, support or latch hook is damaged.
The door gasket or seal is damaged.
The door is bent or warped.
There are defective parts in the door interlock system.
There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case (cabinet) is not fitted.
Carry out any remedial work that is necessary before
operating the oven.
Do not operate the oven if any of the following conditions
exist;
WARNING FOR WIRING
To prevent an electric shock, take the following precautions.
1. Before wiring,
1) Disconnect the power supply cord.
2) Open the door block it open.
3) Discharge the high voltage capacitor and wait for 60
seconds.
2. Don’t let the wire leads touch to the following parts;
1) High voltage parts:
Magnetron, Power transformer, High voltage capacitor
and High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, Power transformer, Oven
cavity and Heating element.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange,
Chassis support and other metallic plate.
4) Moveable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Door cam, Convection
motor, Convection fan, Turntable motor, Damper
motor, Damper door assembly.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector until its pin is locked
and make sure that the wire leads do not come off even
if the wire leads are pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of
the following removal procedures:
OUTER CASE REMOVAL
5. Remove the one (1) screw holding the upper side of the
outer case cabinet to the back plate.
6. Remove the four (4) screws holding the right and left
sides of the outer case cabinet to the bottom plate.
7. Slide the entire outer case cabinet back out about 1 inch
(3cm) to free it from retaining clips on the oven cavity
front plate.
8. Lift entire outer case cabinet from the unit.
1. Disconnect the power supply cord.
2. Open the oven door and block it open.
3. Remove the two (2) special screws from the lower
portion of the back plate using a T20H Torx type or
GTXH20-100 screw driver.
4. Remove the three (3) screws holding the exhaust cover
to the back plate.
30
R-90GC
CAUTION
1. DISCONNECT THE OVEN FROM THE POWER
SUPPLY BEFORE REMOVING THE OUTER CASE
CABINET.
2. DISCHARGE THE HIGH VOLTAGE CAPACITOR
BEFORE TOUCHING ANY OVEN COMPONENTS OR
WIRING.
NOTE
When replacing the outer case cabinet, the two (2)
special Torx screws must be reinstalled in the same
locations.
Special screw
Screw Driver
(Type: TORX T20 H or
GTXH20-100)
Figure C-1. Special screw postion
TERMINAL INSULATOR REPLACEMENT
Installation
1. Insert the receptacle into terminal insulator.
2. Close covers of the terminal insulator, as shown illustlated
below
1. Open covers of the terminal insulator by using small flat
type screw driver.
2. Remove the receptacle from the terminal insulator.
3. Now, the terminal insulator is free.
Terminal
insulator
Covers
Flat type
screw driver
Receptacle
POWER SUPPLY CORD REPLACEMENT
Removal
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the one (1) screw holding the green wire of the
power supply cord to the bottom plate.
6. Disconnect the black wire of the power supply cord from
the fuse holder, and the white wire from the main wire
harness.
7. Nip the cord bushing with bushing pliers and release it
from the hole of the back plate.
8. Remove the cord bushing from the power supply cord,
and the power supply cord from the back plate.
9. Now, the power supply cord is free.
Reinstall
1. Reinstall the cord bushing to the power supply cord.
2. Insert the power supply cord with the cord bushing into
the hole of the back plate.
3. Hold the green wire of the power supply cord to the
bottom plate with the one (1) screw.
4. Reconnect the black wire of the power supply cord to the
fuse holder, referring to the pictorial diagram.
5. Reconnect the white wire of the power supply cord to the
main wire harness, referring to the pictorial diagram.
6. Reinstall the outer case cabinet and check that the oven
is operating properly.
BACK PLATE REMOVAL
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the one (1) screw holding the green wire of the
power supply cord to the bottom plate.
6. Disconnect the black wire of the power supply cord from
the fuse holder, and the white wire from the main wire
harness.
7. Remove the three (3) screws holding the back plate to
the bottom plate.
8. Remove the two (2) screws holding the right and left
chassis supports to the back plate.
9. Release the tabs of the chassis supports from the back
plate.
10.Now, the back plate is free.
POWER TRANSFORMER REMOVAL
PLATE REMOVAL”.
6. Disconnect the main wire harness from the power
transformer.
7. Disconnect the high voltage wire and filament leads of
the power transformer from the high voltage capacitor
and the magnetron.
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the back plate from the oven, referring to “BACK
31
R-90GC
8. Remove the two (2) screws holding the transformer
mounting angle to the bottom plate from under the
bottom plate.
9. Remove the two (2) screws holding the transformer
mounting angle to the bottom plate from the top of the
bottom plate.
10.Remove the four (4) screws holding the power transformer
to the transformer mounting angle.
11.Now, the power transformer is free.
MAGNETRON REMOVAL
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the back plate from the oven, referring to “BACK
PLATE REMOVAL”.
6. Disconnect the high voltage wire of the high voltage
rectifier assembly from the magnetron.
7. Disconnect the filament wire of the power transformer
from the magnetron.
8. Remove the two (2) screws holding the magnetron guide
to the magnetron and remove it.
9. Disconnect the wire leads and the connector from the
solid-state relay.
10.Release the main wire harness from the hole of the
magnetron separator and the hook of the fan motor.
11.Remove the three (3) screws holding the magnetron
separator to the bottom plate and the thermal cover
back.
12.Remove the magnetron separator from the oven.
13.Carefully remove the four (4) screws holding the
magnetron to the waveguide. When removing the screws,
hold the magnetron to prevent it from falling.
14.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
THE MAGNETRON MOUNTING SCREWS
ARE TIGHTENED SECURELY.
HIGH VOLTAGE CAPACITOR AND HIGH VOLTAGE RECTIFIER ASSEMBLY REMOVAL
8. Remove the one (1) screw holding the capacitor holder
to the fan motor mounting angle.
9. Remove the one (1) screw holding the high voltage
rectifier assembly to the capacitor holder.
10.Disconnect the high voltage rectifier assembly from the
high voltage capacitor.
11.Now, the high voltage rectifier assembly is free, and also
the high voltage capacitor is free.
CAUTION: WHEN REPLACING THE HIGH VOLTAGE
RECTIFIER ASSEMBLY, THE GROUND SIDE
TERMINAL MUST BE SECURED FIRMLY
WITH A GROUNDING SCREW.
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the back plate from the oven, referring to “BACK
PLATE REMOVAL”.
6. Disconnect the high voltage wire of the high voltage
rectifier assembly from the magnetron.
7. Disconnect the high voltage wire and the filament lead of
the power transformer from the high voltage capacitor.
FAN MOTOR REMOVAL
POWER TRANSFORMER SIDE
MAGNETRON SIDE REMOVAL
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the back plate from the oven, referring to “BACK
PLATE REMOVAL”.
6. Remove the one (1) screw holding the capacitor holder
to the fan motor mounting angle. And remove the capacitor
holder from the fan motor mounting angle.
7. Disconnect the wire leads from the fan motor.
8. Remove the four (4) screws holding the fan motor
mounting angle to the bottom plate and the thermal cover
back.
9. Remove the three (3) screws holding the fan motor to the
fan motor mounting angle.
10.Now, the fan motor is free.
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the back plate from the oven, referring to “BACK
PLATE REMOVAL”.
6. Disconnect the wire leads from the fan motor.
7. Disconnect the connector of the main wire harness from
the connector of the thermistor.
8. Release the main wire harness from the hole of the
magnetron separator and the hook of the fan motor.
9. Remove the three (3) screws holding the magnetron
separator to the bottom plate and the thermal cover
back.
10.Remove the magnetron separator from the oven.
11.Remove the one (1) screw holding the fan motor to the
bottom plate.
12.Now, the fan motor is free.
32
R-90GC
SOLID-STATE RELAY (MAGNETRON SIDE) REMOVAL
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the back plate from the oven, referring to “BACK
PLATE REMOVAL”.
6. Disconnect the wire leads and the connector from the
solid-sate relay.
7. Release the main wire harness from the hole of the
magnetron separator.
8. Remove the three (3) screws holding the magnetron
separator to the bottom plate and the thermal cover
back.
9. Remove the magnetron separator form the oven.
10.Remove the two (2) screws holding the solid-sate relay
to the magnetron separator.
11.Now, the solid-sate relay is free.
DAMPER MOTOR AND DAMPER SWITCH REMOVAL
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the back plate from the oven, referring to “BACK
PLATE REMOVAL”.
6. Remove the one (1) screw holding the right chassis
support to the oven cavity front plate.
7. Disconnect the wire leads from the damper motor.
8. Remove the two (2) screws holding the damper motor to
the motor mounting angle.
9. Now, the damper motor is free.
10.Disconnect the wire leads from the damper switch.
11.Remove the two (2) screws holding the motor mounting
angle to the damper duct assembly.
12.Remove the one (1) screw holding the damper switch to
the motor mounting angle.
13.Now, the damper switch is free.
HEATER DUCT LEFT ASSEMBLY, HEATER DUCT UPPER ASSEMBLY AND CONVECTION
DUCT ASSEMBLY REMOVAL
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the back plate from the oven, referring to “BACK
PLATE REMOVAL”.
6. Remove the door assembly from the oven, referring to
“DOOR REPLACEMENT”, and remove the door springs,
the door cam right and the door cam left.
7. Remove the power transformer, magnetron, magnetron
separator, high voltage capacitor assembly, fan motor
(power transformer side) with fan mounting angle, and
fan motor (magnetron side), referring to their removal
procedures.
8. Disconnect the wire leads from all electrical parts except
for the turntable motor, monitor switch, secondary
interlock switch and door sensing switch.
9. Remove the two (2) screws holding the latch hook right
and latch hook left from the oven cavity front plate.
10.Remove the two (2) screws holding the right and left
chassis supports to the oven cavity front plate.
11.Remove the two (2) screws holding the exhaust duct to
the oven cavity. And remove it.
12.Remove the one (1) screw holding the damper duct
assembly to the oven cavity from inside of the oven
cavity.
13.Remove the two (2) screws holding the damper duct
assembly to the thermal cover upper and the waveguide.
14.Remove the damper duct assembly from the oven.
15.Remove the two (2) screws holding the separator left to
the thermal cover upper. And remove it.
16.Disconnect the connector of the touch control transformer
from the power unit.
17.Remove the one (1) screw holding the touch control
transformer to the bottom plate. And remove it.
18.Remove the two (2) screws holding the PWB mounting
angle to the bottom plate.
19.Remove the PWB mounting angle with the power unit
from the bottom plate.
20.Remove the three (3) screws holding the thermal cover
left to the heater duct left.
21.Remove the one (1) screw holding the thermal cover left
to the thermal cover upper.
22.Straighten the three (3) tabs holding the thermal cover
left to the oven cavity, and remove the thermal cover left
and the thermal insulation left from the oven cavity.
23.Remove the two (2) screws holding the thermal cover
upper to the heater duct upper.
24.Straighten the four (4) tabs holding the thermal cover
upper to the oven cavity, and remove the thermal cover
upper and the thermal insulation upper from the oven
cavity.
25.Straighten the two (2) tabs holding the thermal insulation
upper, and remove it.
26.Remove the fourteen (14) screws holding the heater
duct left to the oven cavity and the convection duct.
27.Remove the heater duct left assembly from the oven
cavity.
28.Now, the heater duct left assembly is free.
29.Remove the two (2) screws holding the convection motor
mounting angle to the bottom plate from under the
33
R-90GC
bottom plate.
30.Remove the thirteen (13) screws holding the convection
duct to the oven cavity and the heater duct upper.
31.Remove the convection duct assembly from the oven
cavity.
32.Now, the convection duct assembly is free.
33.Remove the nine (9) screws holding the heater duct
upper to the oven cavity.
34.Remove the heater duct upper from the oven cavity.
35.Now, the heater duct upper assembly is free.
SIDE HEATING ELEMENT REMOVAL
cavity, referring to “HEATER DUCT LEFT ASSEMBLY,
HEATER DUCT UPPER ASSEMBLY AND
CONVECTION DUCT ASSEMBLY REMOVAL
7. Remove the one (1) screw holding the heater mounting
angle B to the heater duct left.
8. Remove the two (2) nuts holding the side heating element
to the heater duct left.
9. Now, the side heating element is free.
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the back plate from the oven, referring to “BACK
PLATE REMOVAL”.
6. Remove the heater duct left assembly from the oven
CONVECTION MOTOR REMOVAL
7. Loosen the one (1) screw holding the convection fan
assembly to the convection fan motor shaft with a
hexagon key wrench, and remove the convection fan.
8. Remove the four (4) screws holding the convection
motor mounting angle to the convection duct.
9. Remove the six (6) screws holding the convection motor
to the convection motor mounting angle.
10.Remove the convection motor from the convection motor
mounting angle.
11.Now, the convection motor is free.
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the back plate from the oven, referring to “BACK
PLATE REMOVAL”.
6. Remove the convection duct assembly from the oven
cavity, referring to “HEATER DUCT LEFT ASSEMBLY,
HEATER DUCT UPPER ASSEMBLY AND
CONVECTION DUCT ASSEMBLY REMOVAL
TOP HEATING ELEMENT REMOVAL
cavity, referring to “HEATER DUCT LEFT ASSEMBLY,
HEATER DUCT UPPER ASSEMBLY AND
CONVECTION DUCT ASSEMBLY REMOVAL
7. Remove the one (1) screw holding the heater mounting
angle A to the heater duct upper.
8. Remove the two (2) nuts holding the top heating element
to the heater duct upper.
9. Now, the top heating element is free.
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the back plate from the oven, referring to “BACK
PLATE REMOVAL”.
6. Remove the heater duct left assembly from the oven
TURNTABLE MOTOR REMOVAL
1. Disconnect the power supply cord.
2. Wait for 60 seconds to discharge the high voltage
capacitor.
3. Remove the turntable tray and the turntable support from
the oven cavity.
4. Lay the oven on its backside.
5. Remove the turntable motor cover by snipping off the
material in four corners.
6. Where the corners have been snipped off, bend corner
areas flat. No sharp edges must be evident after removal
of the turntable motor.
7. Disconnect the wire leads from the turntable motor.
8. Remove the one (1) screw holding the turntable motor to
the oven cavity bottom plate.
9. Now, the turntable motor is free.
10.After replacement, use the one (1) screw to fit the
turntable motor cover.
DOOR SENSING SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REPLACEMENT
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
Removal
1. Disconnect the power supply cord.
34
R-90GC
3.
4.
5.
6.
Open the oven door and block it open.
Discharge the high voltage capacitor.
Disconnect the wire leads from the switch.
Remove the one (1) screw holding the latch hook (right
or left) to the oven cavity front plate, and release the latch
hook (right or left).
7. Keep pushing the stopper tub holding the switch to the
latch hook (right or left) and revolve the switch on the
pole.
8. Remove the switch from the latch hook (right or left).
9. Now, the switch is free.
Reinstallation
1. Reinstall the switch in its place. The door sensing switch
is in the lower position of the latch hook right. The
secondary interlock switch is in the lower position of the
latch hook left. And the monitor switch is in the upper
position of the latch hook left.
2. Hold the latch hook (right or left) to the oven cavity front
plate with the one (1) screw.
3. Reconnect the wire leads to the switch.
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.
Latch hook left
Latch hook right
Monitor switch
Stopper
tab
Pole
Pole
Pole
Stopper tab
Door
sensing switch
Secondary
interlock
switch
Figure C-2. Switches
DOOR SENSING SWITCH, SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH
ADJUSTMENT
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.
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Loosen each one (1) screw holding the latch hook right
and the latch hook left to the oven cavity front plate.
6. With door closed, adjust the latch hook right and the latch
hook left by moving them back and forth, and up and
down. In and out play of the door allowed by the latch
hook right and the latch hook left should be less than 0.5
mm. The vertical position of the latch hook right and the
latch hook left should be adjusted so that the door
sensing switch and the secondary interlock switch are
activated with the door closed. The horizontal position of
the latch hook right and the latch hook left should be
adjusted so that the plunger of the monitor switch is
pressed with the door closed.
7. Secure the screws firmly.
8. Check all of the switches operation. If any switch has not
activated with the door closed, loosen the screws and
adjust the position of the latch hook right and the latch
hook left.
After adjustment, check the following.
1. In and out play of the door remains less than 0.5 mm
when in the latched position. First check the position of
the latch hook right, pushing and pulling right portion of
the door toward the oven face. Then check the position
of the latch hook left, pushing and pulling left portion of
the door toward the oven face. Both results (play in the
door) should be less than 0.5 mm.
2. The door sensing switch and the secondary interlock
switch interrupt the circuit before the door can be opened.
3. The monitor switch contacts close when the door is
opened.
4. Reinstall the outer case cabinet and check for microwave
leakage around the door with an approved microwave
survey meter. (Refer to Microwave Measurement
Procedure.)
Monitor switch
Latch hook left
Latch
head
Secondary
interlock switch
Latch hook right
Latch
head
Door
sensing switch
Figure C-3. Latch Switch Adjustment
DOOR REPLACEMENT AND ADJUSTMENT
Door assembly removal
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
35
R-90GC
5. Close the door.
6. Remove the two (2) door springs from the door cam right,
oven hinge right, door com left and oven hinge left.
7. Release the door cams right and left from the right and
left door cam pins of the door.
8. Remove the door cams right and left from the oven cavity
front plate.
9. Open the door assembly at an angle of more than 90˚
with the oven cavity front plate.
10.To release the right and left door hinge pins of the door
assembly from the oven hinges right and left, slide the door
assembly leftward. When removing the door assembly,
hold the door assembly to prevent it from falling.
11.Now, the door assembly is free.
NOTE: When the individual parts are replaced, refer to
“Door Disassembly”
cavity front plate.
3. Reinstall the outer case cabinet and check for microwave
leakage around the door with an approved microwave
survey meter. (Refer to Microwave Measurement
Procedure.)
NOTE: The door on a microwave oven is designed to
act as an electronic seal preventing the leakage
of microwave energy from the oven cavity during
cook cycle. This function does not require that
the door be airtight, moisture (condensation)tight or light-tight. Therefore, occasional
appearance of moisture, light or sensing of
gentle warm air movement around the oven
door is not abnormal and do not of themselves
indicate a leakage of microwave energy from the
oven cavity. If such were the case, your oven
could not be equipped with a vent, the very
purpose of which is exhaust the vapor-laden air
from the oven cavity.
Door assembly reinstallation
1. On reinstalling the door assembly, insert the oven hinges
right and left into the right and left door hinge pins.
2. Insert and hook the door cams right and left to the right
and left door cam pins.
3. Reinstall the two (2) door springs between the door cams
and the oven hinges right and left.
NOTE: After any service to the door;
(A) Make sure that the door sensing switch and the
secondary interlock switch are operating properly.
(Refer to chapter “Test Procedure”.)
(B) An approved microwave survey meter should be
used to assure compliance with proper microwave
radiation emission limitation standards.
Door cam left
Door spring
Door cam right
Oven hinge
left
Door
spring
Door
assembly
Oven hinge
right
Door adjustment
Figure C-4(a). Door Replacement
When removing and/or loosening the oven hinges such as in
door replacement, the following adjustment criteria are taken.
Door adjustment is performed with the door properly installed and closed and while the oven hinges are loose.
1. Loosen the screws holding the oven hinge right and the
oven hinge left to the bottom plate with screwdriver.
2. Adjust the door by moving it so that the door is parallel
with the oven cavity front plate lines (right and left side
lines) and the door latch heads pass through the latch
holes correctly.
3. Tighten the screws holding the oven hinge right and the
oven hinge left to the bottom plate.
After adjustment, make sure of the following:
1. The door latch heads smoothly catch the latch hooks
through latch holes and the latch heads goes through
center of latch holes.
2. The door is positioned with its face pressed toward oven
Left door
cam pin
Door cam left
Oven hinge
left
Door
assembly
Left door
hinge pin
Right door
cam pin
Door cam right
Right door
hinge pin
Oven hinge
right
Figure C-4(b). Door Replacement
DOOR DISASSEMBLY
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Remove the door assembly, referring to “Door
Replacement”.
6. Place the door assembly on a soft cloth with latch heads
facing up.
NOTE: As the engaging parts of the choke cover and
the door panel assembly are provided at 16
places, do not force any particular part.
7. Replacement of the door components are as follows:
36
R-90GC
CHOKE COVER
22.Pull out the two (2) handle pins from the two (2) handle
levers.
23.Remove the two (2) handle levers from the door panel.
24.Now, the door panel is free.
8. Insert a putty knife (thickness of about 0.5 mm) into the
gap between the choke cover and the door panel
assembly as shown in Figure C-5.
9. Lift up the choke cover.
10.Now, the choke cover is free from the door panel
assembly.
NOTE: When carrying out any repair to the door, do not
bend or wrap the slit choke (tabs on the door
panel assembly) to prevent microwave leakage.
MIDDLE DOOR GLASS
25.Remove the two (2) screws holding the glass mounting
angle B to the door frame.
26.Remove the middle door glass from the door frame.
27.Now, the middle door glass is free.
DOOR HANDLE ASSEMBLY
FRONT DOOR GLASS
11.Remove the two (2) screws holding the door handle
assembly to the door panel assembly through the door
frame.
12.Now, the door handle is free.
28.Remove each two (2) screws holding the two glass
mounting angles A to the door frame.
29.Remove the two (2) glass mounting angles A from the
door frame.
30.To release the two (2) tabs holding the lower end of the
front door glass, slide the front door glass upward.
31.Release the three (3) tabs holding the upper end of the
front door glass and remove the front door glass from the
door frame.
32.Now, the front door glass is free.
DOOR PANEL ASSEMBLY, LATCH HEAD R AND
LATCH HEAD L
13.Remove the fourteen (14) screws holding the door panel
assembly to the door frame.
14.Remove the door panel assembly from the door frame.
15.Remove the one (1) screw holding the latch head R to the
door panel assembly.
16.Remove the latch spring R from the latch head R and the
handle lever.
17.Now, the latch head R is free.
18.Remove the one (1) screw holding the latch head L to the
door panel assembly.
19.Remove the latch spring L from the latch head L and the
handle lever.
20.Now, the latch head L is free.
21.Release the two (2) handle springs from the two (2)
handle levers.
Choke
Cover
Door Panel
Assembly
Putty Knife
Door
Frame
Figure C-5. Door Disassembly
CONTROL PANEL ASSEMBLY AND CPU UNIT REMOVAL
Control panel assembly
12.Remove the twenty-two (22) screws holding the CUP
unit to the panel sub assembly.
13.Now, the CPU unit is free.
NOTE: After the panel angle is removed from the panel
sub assembly, it is can be found that the bottom
side of the panel sub assembly is melted and
transformed by heat. But it is not abnormal and
no problem to use the oven.
1. Disconnect the power supply cord.
2. Remove the outer case cabinet, referring to “OUTER
CASE CABINET REMOVAL”.
3. Open the oven door and block it open.
4. Discharge the high voltage capacitor.
5. Disconnect the 20-pin harness from the connectors CNG and CN-H on the power unit.
6. Remove the four (4) screws holding the control panel
assembly to the oven cavity front plate.
7. Slide the control panel assembly leftward to release the
eight (8) tabs of the control panel assembly from the
oven cavity front plate.
8. Now, the control panel assembly is free.
Screw
Bottom side of
panel sub assembly
Tabs
Panel angl
CPU unit
Screw
9. Remove the two (2) screws holding the panel angle to
the panel sub assembly.
10.Release the panel angle from the two (2) tabs of the
panel sub assembly first.
11.Pull out the panel angle from the panel sub assembly and
remove it.
Panel sub assembly
Figure C-6. Panel Angle Removal
37
H
1
2
3
38
TOUCH CONTROL
TRANSFORMER
CN-D
4
6
1
5
1
COM.
RY2
R
E
D
D
1 BLK
2
3 RED
4
5 ORG
1 RED
2 GRN
3 BLU
4 BRN
5 BLK
6 WHT
5
6
BLK 3 BLK
WHT 1 WHT
RED 2 RED
R
E
D
3
1
4
2
POWER SUPPLY CORD
120V 60Hz
CONVECTION
MOTOR
THERMISTOR
BLK
2 WHT
1
R
E
D
RED
BLK
WHT WHT
SIDE
HEATING
ELEMENT
WHT
WHT
BLK
GRN
MONITOR FUSE F20A
ORG
SIDE
HEATER
THERMAL
CUT-OUT
NOTE:
The grounding conductor of the power supply cord has
been grounded by power supply cord fixing screw.
The screw must be kept allways tight.
BRN
RED
RED
SOLID-STATE
RELAY
(Magnetron side)
B
L
K
WHT
WHT
SECONDARY
INTERLOCK
SWITCH
COM
1
3
RED
2
4
ORG
BRN
SOLID-STATE
RELAY
(Side heating
element side)
WHT
N.O.
MONITOR
SWITCH
GRY
BLK
COM
GRY
GRY
R
E
D
N.C.
5
Figure S-1. Pictorial Diagram
PRIMARY
INTERLOCK
RELAY
B
L
K
G W
R H
Y T
HIGH VOLTAGE
CAPACITOR
HIGH VOLTAGE
RECTIFIER
GRY
WHT
K
BL
Black color is using for the ovens until serial number 01300
Red color is using for the ovens from serial number 01301
CN-E
R
E
D
CN-E
O
R
G
G G
R R
Y Y
4
CN-B
1
COM.
RY1
B
L
K
3
13
CN-H
1
R
E
D
2
8
CN-B
1
CN-C
B
R
N
1
ORG
ORG
1
3
BRN 6
5
ORG 4
RED 3
YLW 2
WHT 1
CN-A
CN-G
4
R O
E R
D G
3 2
CN-C
RED
POWER
TRANSFORMER
O
R
G
HIGH VOLTAGE
COMPONENTS
FAN MOTOR
(Power transformer side)
2
BLU 8
7
CN-H
POWER UNIT
CN-G
B
L
K
4
RED
GRY
MAGNETRON
6
1
WH-C
1
CN-A
1
CN-D
9
from
CPU UNIT
B R
L E
K D
MAGNETRON
TEMPERATURE
FUSE
WHT
6
3
6
BLU 5
4
WHT 3
2
GRN 1
8
GRY 7
BRN 9
BLK
BLK
FUSE F10A
FAN MOTOR
(Magnetron side)
DAMPER
MOTOR
1
WH-C
2
GRY
G
BLK
N.O.
RED
GRN
GRY
7
B
WHT
BLU
WHT
RED
GRY
WHT
BRN
BLU
DAMPER
SWITCH
WH-A
CPU UNIT
1
1
TURNTABLE
MOTOR
CONVECTION
MOTOR
CAPACITOR
BLK
ORG
COM
RED
BRN
1 WH-B 13
TOP
HEATING
ELEMENT
A
OVEN LAMP
RED
GRN
TOP HEATER
THERMAL
CUT-OUT
C
COM
N.O.
G G
R R
N N
E
DOOR
SENSING
SWITCH
F
to POWER UNIT
R-90GC
6
D
RE
A
B
C
N
BR
G
OR
D
E
F
G
H
R-90GC
2
1
4
3
6
5
A
A
T1
A-2
G-3
VN
G-4
VF
G-5
VEE
H-6
VC
G-1
VS
H-13
INT
H-7
BZ
TURN
OVER
FAN
MOTOR
DAMPER
MOTOR
CONVECTION
MOTOR
A-1
D5
D3
A-4
B
+
-
C9
D1-D4 1N4002L x4
100u
10V
R6 6.8 1W
D-1
1W
RY6
D-5
0.1u/50V
0.01u/50V
KIA79L5P
R11
1.5K 1/4W
H-2
H-5
E-5
DAMPER
MOTOR
E-3
CONVECTION
MOTOR
E-1
H-4
D11
RY5
FAN
MOTOR
H-3
(J2)
D16
D15
RY2
R16
3.3K 1/4W
D17
H-1
COM
G-2
WATCH
H-12
DOOR (B)
H-11
DOOR (A)
G-6
DAMPER
SWITCH
THERMISTOR
G-7
H-8
G
C50
C-3
D18
0.01u/50V
C51
C-1
SIDE
HEATING
ELEMENT
H-10
TOP
HEATING
ELEMENT
DAMPER
SWITCH
B-4
F
<NOTE>
0.01u/50V
B-2
E
POWER
TRANSFORMER
H-9
R18
3.3K 1/4W
C-2
DOOR
SENSING
SWITCH
THERMISTOR
3.3K 1/4W
C-4
D
R17
F
SIDE
+
HEATING SSR
ELEMENT
TOP
+
HEATING SSR
ELEMENT
C
1.5K
1/4W
R19
D21 1N5817
D14
RY1
COM
NO
POWER
TRANSFORMER COM
D20
(J1)
NO
-
10u/50V
D13
RY3
+
C11
D12
Q19 DTD143ES
RY4
B
C55
Q5
I
D-3
D
OVEN LAMP
TURNTABLE
MOTOR
Q2
O DTA143ES
D10
D-7
R10
SP1
D-9
E
C
R5 510
AC240V/60HZ
TURN
OVER
C4
-
3.3K 1/4W
C
FUSE1
10G471K
VRS1
A-8
+
1000u/35V
D4
A-6
C7
D2
C8
A-3
0.1u/50V
D1
: IF NOT SPECIFIED 1SS133
B-1
G
B-3
B-6
B-5
H
H
Figure S-2. Power Unitl Circuit
1
2
4
3
39
5
6
B-1 2
A-6
DOOR
(B)
DAMPER
SWITCH
Q13
Q11
Q10
POWER
B-8
TRANSFORMER
+
Q12
B-1 0
B-1 1
B-1
B-6
AN0
R15 (15K)
-
B-9
SIDE
HEATING
ELEMENT
TOP
HEATING
ELEMENT
VC
COM
OVEN LAMP
TURNTABLE
MOTOR
DOOR
(A)
THERMISTOR A-7
B-1 3
INT
A-1
VS
A-2
WATCH
C1
WH-B
13pin Harness
D50
R50 LD1
AN8
15K
R31
P76
AN1
AN9
P77
330F
R41
15K
R21
AN2
SW24
450˚F
SW23
325˚F
AN10
AN3
AN11
SW22
425˚F
SW21
300˚F
400˚F
SW19
275˚F
P75
P7
ZD10
HZ20-1
Q1
KRA117M
AN4
P74
Q40
3.3K
(JB)
(J14)
(J12)
(J10)
AN5
SW20
BASIC
BAKE
REHEAT POPCORN
ROAST
COOK
SW1
SW3
SW8
SW10
SW5
COMPU
COMPU
NORMAL
PREHEAT CONVECTION
DEFROST
COOK
SW9
SW4
SW6
SW2
R30
10u
50V
D51
R51 LD2
GRILL
SW7
560 x11
4.7K
WH-A
7pin Harness
POWER
TIMER/
STOP/
LEVEL
CLOCK
CLEAR
SW25
SW27
SW29
CUSTOM MINUTE
START
HELP
PLUS
SW30
SW26
SW28
SW1-SW30
R40
A-4
A-3
A-5
R3
C15
0.1u
50V
0.1u/50V
P82
D52
R20
C30
18KF
4.7K
4.7K
LD4
D53
2.2KF
C5
C2
C10
P81
P8
P80
R42
R52 LD3
C20
C40
ZD1
P73
SW13
SW12
(J11)
(J13)
(J15)
(JA)
AN14
AN15
P72
4MHz
R4 4.7K
KRC101M
AN7
350˚F
SW16
AN13
1.5K
100˚F
SW15
AN6
RECIPES
SW11
ENTER
SW14
SW18
375˚F
SW17
150˚F
AN12
B-5
FAN
MOTOR
Q14
B-7
BZ
R1
B-4
Q15
4.7K
D55
LD7
DAMPER
MOTOR
Q16
R53
D54
R54 LD5
HZ4A2
R55 LD6
B-3
Q17
R2
C3
LD8
CF1
R56
4.7K
0.1u/50V
LD9
R58
R57
D57
LD11
R60
D56
LD10
CONVECTION
MOTOR
P81
P80 20
VSS
Xin
Xout
VCC
P77 25
P76
P75
P74
P73
P72
CNVss
RESET
AN5
AN4
AN3
AN2
AN1 5
AN0
AN15
AN14
AN13
AN12 10
AN11
AN10
AN9
AN8
P83 15
P82
PB3
PB2
PB1
PB0
0.1u
50V
C6
Q51
Q50
35 SCL
R59
Q18
SDA
40
5
IC- 1
AT24C01
1 2 3 4
IC-2
8 7 6 5
R75 47K
FLD10
FLD11
FLD12
75 FLD13
FLD14
FLD15
FLD16
FLD17
70 FLD18
FLD19
FLD20
FLD21
FLD22
65 FLD23
FLD24
FLD25
FLD26
FLD27
60 FLD28
FLD29
FLD30
FLD31
FLD32
55 FLD33
FLD34
FLD35
FLD36
FLD37
FLD8
FLD9
R76 4.7K
R77 4.7K
SDA
: IF NOT SPECIFIED 1/4W±5%
: IF NOT SPECIFIED DTA143ES
or KRA101M
: IF NOT SPECIFIED 0.01µF / 6V
: IF NOT SPECIFIED 1SS270A
FLUORESCENT DISPLAY TUBE
[NOTE]
x2
100Kx10
R70,R71
DG1
5
Figure S-3. CPU Unit Circuit
<CN-F>
B-2
4
P71
P70
P67
P66
P65
P64
3
TURN
OVER
4
F-1
F-4
F-3
F-2
F-5
F-6
F-7
F-8
2
3
VCC
VSS
RESET
CNVSS
BUSY
SCLK
SDA
OE
1
FLD24
FLD2
FLD2
FLD25
FLD26
FLD2
FLD2
FLD27
FLD2
FLD28
FLD2
FLD29
FLD30
FLD3
FLD31
FLD3
H
FLD23
FLD22
FLD21
FLD20
FLD19
FLD18
FLD17
FLD16
FLD15
FLD14
FLD13
FLD12
FLD11
FLD10
G
FLD9
FLD8
FLD7
FLD6
FLD5
FLD4
FLD3
FLD2
FLD1
FLD0
F
78 F1
77 F1
76 F1
75 NP
74 NP
73 IC
P14
72 P1
P13
71 P1
P12
70 P1
P11
69 P1
P10
68 P1
67 P9
66 P8
65 P7
64 P6
63 P5
62 P4
61 P3
60 P2
59 P1
58 NC
57 NC
56 NC
55 NC
54 1G
53 2G
52 3G
51 4G
50 5G
49 6G
48 7G
47 8G
46 9G
45 10G
44 NP
43 NP
42 F2
41 F2
40 F2
E
FLD3
FLD32
FLD3
FLD33
FLD34
FLD3
FLD3
FLD35
FLD3
FLD36
FLD37
FLD3
FLD3
FLD38
FLD3
FLD39
FLD4
FLD40
FLD41
FLD4
FLD4
FLD42
FLD4
FLD43
FLD4
FLD44
FLD4
FLD45
FLD4
FLD46
FLD4
FLD47
FLD48
FLD4
FLD4
FLD49
FLD5
FLD50
FLD5
FLD51
D
C75
AN6
AN7
Vref
AVss
PB0
95 PB1
PB2
PB3
PB4
PB5
90 PB6
VEE
FLD0
FLD1
FLD2
85 FLD3
FLD4
FLD5
FLD6
FLD7
B
2
FLD51
FLD50
FLD49
FLD48 40
FLD47
FLD46
FLD45
FLD44
FLD43 45
FLD42
FLD41
FLD40
FLD39
FLD38
A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
1
NP
NP
NP
NP
NP
IC
P42
P41
P40
P39
P38
P37
P36
P35
P34
P33
P32
P31
P30
P29
P28
P27
P26
P25
P24
P23
P22
P21
P20
P19
P18
P17
P16
P15
NP
NP
NP
NP
NP
VF
VN
VEE
R-90GC
6
A
B
C
C
6
D
E
F
G
H
R-90GC
2
1
4
3
6
5
A
A
B
B
C
1G
2G
3G
4G
5G
6G
1a
1a
1a
1a
1a
1a
7G
1a
col1
D
2a
3a
3a
Dp2
S2
10G
1a
1a
2a
2a
2a
Dp2
3a
3a
3a
Dp2
S8
S9
C
col2
2a
2a
2a
2a
2a
3a
3a
3a
3a
3a
S5
S6
S7
Dp3
S1
9G
1a
col1
col2
2a
8G
Dp2
Dp3
Dp3
S3
S4
D
a
h j
f
E
k
b
E
g
r
n
e
p
c
d
[ 1G - 10G ]
F
F
G
G
H
H
Figure S-4. Grid Assignment of Fluoresent Display Tube
1
2
4
3
41
5
6
SW7
SW3
SW4
SW6
WH-C
SW5
1
6
SW2
SW1
1
6
SW9
SW8
1
LD8
LD9
LD4
SW10
LD11
LD6
LD5
SW13
RY1
R11
SW14
JP5
JP2
JP4
78
Q50
Q51
6
E C B
8
73
E C B
C75
R75
JP9
JP10
76
1
IC2
4
R76
R71
5
R77
C6
SCL
JP6
JP7
JP8
JP12
JP13
JP14
DG1
R70
42
JP17
JP16
45
34
40
JP20
DIP
CF1
SW16
R2
SW15
JP22
5
SW18
JP30
SW17
RY5
R10
RY4
SP1
SW20
Q40
B C E
JP34
SW19
1
C1
CNE
SW22
JP41
SW21
3
RY3
R20
C2
SW24
SW23
C15
C30
C20
R30
RY2
13
B
LD2
SW25
R31
Q11
JP49
627AF
D15
SW26
E
R51
C E
JP52
JP59
JP58
JP57
JP56
JP55
Q12
JP54
B C E
SW28
C10
SW27
JP61
Q14
Q15
JP62
WH-B
1
JP64
SW30
JP68
LD1
SW29
Q10
JP70
B C E
JP69
5
Figure S-5. Printed Wiring Board of CPU Unit
SW11
LD10
LD7
LD3
SW12
1
WH-A
JP11
7
2
VSS
WH-1
1
D21
D20
DIP
Figure S-5. Printed Wiring Board of Power Unit
1 6
CNB
JP15
8
R6
D5
D16
D17
D18
SCL
CNA
C50
R19
JB
VRS1
C8
JP4
C51
R16
R17
R18
JP21
C7
JP1
Q5
D14
JP24
R59
R60
R57
R58
R53
R55
R56
R54
R52
C
R5
JP18
JP19
VSS
J11
J13
J15
JA
J10
JP3
1
JP26
JP28
JP29
RY6
SDA
JP31
CNC
JP33
4
SDA
J12
J14
JP27
ZD10
JP23
R4
JP32
B C E
R41
I 0
C40
C55
JP35
D57
D56
D55
D54
D53
D52
D51
D50
JP37
JP38
Q1
5
JP25
D4
C3
R1
1
ZD1
42
JP39
R42
4
JP36
3
JP40
2
R40
9
JP42
G
R15
CND
JP43
F
JP44
D2
D1
C5
D3
R21
E1
JP6
JP45
C9
JP48
FUS
CNG
JP46
7
JP47
B
B CE
1
C4
JP51
JP7
JP50
JP1
13
JP53
E
Q19 C
Q2
E C B
R3
C11
(R7)
Q13
C
D
(J2)
B
CNH
(ZD6)
JP60
(J1)
B C E
1
(Q3) E C B
JP63
JP3
JP2
R50
E
D11
4
JP65
D12
E
D13
E
B
B C
A
B C
Q18
C
3
527AF
1
2
Q16 B C E
Q17
1
JP67
D10
R-90GC
6
A
B
C
H
6
D
E
F
G
H
R-90GC
PARTS LIST
Note: The parts marked "∆" may cause undue microwave exposure.
The parts marked "*" are used in voltage more than 250V.
REF. NO.
PART NO.
DESCRIPTION
Q'TY
CODE
3
1
1
1
1
1
1
2
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
AF
AS
AY
AX
AM
BH
AT
BA
AW
AN
AW
AU
AM
AY
AH
AG
AG
AH
AH
AM
AM
AK
BS
AQ
BK
ELECTRICAL PARTS
*
*
*
*
∆*
1- 1
1- 2
1- 3
1- 4
1- 5
1- 6
1- 7
1- 8
1- 9
1-10
1-11
1-11
1-12
1-13
1-14
1-15
1-16
1-17
1-18
1-19
1-20
1-21
1-22
1-23
1-24
QSW-MA085WRE0
RMOTDA191WRE0
RHET-A256WREZ
RHET-A257WREZ
FH-HZA053WRE0
RMOTCA011WREZ
RMOTDA189WRE0
FMOTEA459WRKZ
FACCDA092WREZ
FH-DZA104WRKZ
RC-QZA288WRZZ
RC-QZA235WRE0
FFS-BA033WRKZ
VHRG3NE22TL-1
QFS-CA026WRZZ
QFS-TA014WRE0
QFSHDA009WRE0
QFSHDA019WRE0
RC-QZA314WRZZ
RLMPTA083WRZZ
RTHM-A109WRE0
RTHM-A110WRE0
RTRN-A678WRZZ
RTRNPA002WRZZ
RV-MZA288WRE0
Secondary interlock/door sensing/damper switch
Damper motor
Top heating element
Side heating element
Thermistor
Convection motor
Turntable motor
Fan motor assy
Power supply cord
High voltage rectifier assy
High voltage capacitor
High voltage capacitor (Interchangeable)
Monitor fuse 20A and monitor switch (V-5220Q) assembly
Solid-state relay
Fuse F10A
Temperature fuse 150 deg. C (MG)
Fuse holder
Fuse holder
convection motor capacitor
Oven lamp
Thermal cut out 170 deg.C(Top heater) 170deg.C OFF 155deg.C ON
Thermal cut out 150 deg.C(Side heater) 150deg.C OFF 130deg.C ON
Power transformer
Touch control transformer
Magnetron
FFS-BA033WRKZ is including QFS-BA009WRE0 (Monitor fuse) and QSW-MA086WRE0 (Monitor switch).
CABINET PARTS
2222-
1
2
3
4
GCABDA103WRPZ
GDAI-A350WRPZ
GLEGPA092WREZ
GCABUA850WRPZ
Back plate
Bottom plate
Leg
Outer case cabinet
CPWB-A868DRUZ
QCNCMA481DRZZ
QCNCMA267DRE0
QCNCMA270DRE0
QCNCMA227DRE0
QCNCMA234DRE0
QCNCMA469DRZZ
QCNCMA483DRZZ
VCKYD11HB103K
VCKYD21HF104Z
VCEAG31VW108M
VCEAG31AW107M
VCEAG31HW106M
VCKYD11HB103K
VCKYD21HF104Z
RH-DZA006PRE0
VHD1SS133//-2
VHD1SS133//-2
VHD1SS133//-2
VHD1N5817//-1A
QFS-AA011PRE0
VSDTA143ES/-3
VHIKIA79L05-3
VSDTD143ES/-3
VRS-B13AA301J
VRS-B13AA6R8J
VRD-B22EF332J
VRD-B22EF152J
VRD-B22EF153J
VRD-B22EF152J
RRLY-A113DRE0
RRLY-B004MRE0
Power unit
6-pin connector(CN-A)
6-pin connector(CN-B)
4-pin connector(CN-C)
5-pin connector(CN-D)
3-pin connector(CN-E)
7-pin connector(CN-G)
13-pin connector(CN-H)
Capacitor 0.01µF 50V
Capacitor
0.1µF 50V
Capacitor 1000µF 35V
Capacitor
100µF 10V
Capacitor
10µF 50V
Capacitor 0.01µF 50V
Capacitor
0.1µF 50V
Diode (1N4002L)
Diode (1SS133)
Diode (1SS133)
Diode (1SS133)
Diode (1N5817)
Fuse (GDC-V-2.5A)
Transistor (DTA143ES)
Regulator (KIA79L05P)
Transistor (DTD143ES)
Resistor 300 ohm 1W
Resistor 6.8 ohm 1W
Resistor 3.3k ohm 1/4W
Resistor 1.5k ohm 1/4W
Resistor 15k ohm 1/4W
Resistor 1.5k ohm 1/4W
Relay (DU24D1-1P(M)-R)
Relay (FTR-F3AA024E)
1
1
2
1
AS
AT
AD
BA
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
9
1
1
1
1
1
1
1
1
1
1
1
1
1
1
BE
AE
AC
AC
AC
AC
AE
AE
AC
AB
AF
AC
AB
AC
AB
AD
AA
AA
AA
AD
AE
AB
AE
AC
AB
AB
AB
AA
AA
AA
AM
AF
CONTROL PANEL PARTS
3- 1
3- 1A
3- 1B
3- 1C
3- 1D
3- 1E
3- 1F
3- 1G
C4
C7
C8
C9
C11
C50-51
C55
D1-4
D5
D10-18
D20
D21
FUSE1
Q2
Q5
Q19
R5
R6
R10
R11
R16-18
R19
RY1-2
RY3-5
43
R-90GC
REF. NO.
RY6
SP1
VRS1
3-2
3-2-1A
3-2-1B
3-2-1C
3-2-1D
3-2-1E
C1
C2
C3
C5
C6
C10
C15
C20
C30
C40
C75
CF1
D50-57
IC-1
IC-2
LD1-11
Q1
Q10-18
Q40
Q50-51
JA
JB
R1-4
R15
R20
R21
R30
R31
R40
R41
R42
R50-60
R70
R71
R75
R76
R77
ZD1
SW1-30
3- 3
3- 3-1
3- 3-2
3- 3-3
3- 4
3- 5
3- 6
3- 7
3- 8
PART NO.
RRLY-A112DRE0
RALM-A014DRE0
RH-VZA032DRE0
CPWB-A867DRUZ
QW-VZA163DRZZ
QW-VZA165DRZZ
LHLD-A246WRFZ
RV-KXA080DRZZ
QW-VZA171DRZZ
VCEAG31HW106M
VCKYD21HF104Z
VCKYD21HF104Z
VCKYD21CY103N
VCKYD21HF104Z
VCKYD21HF104Z
VCKYD21CY103N
VCKYD21CY103N
VCKYD21CY103N
VCKYD21CY103N
VCKYD21CY103N
RCRM-A001FBZZ+
VHD1SS133//-2
RH-IXA156DRZZ
RH-IZA979DRE0
VHPLTL1CHE/-3
VSKRA117M++-1+
VSKRA101M//-3
VSKRC101M//-3
VSKRA101M//-3
VRD-B22EF152J
VRD-B22EF332J
VRD-B22EF472J
VRD-B22EF153J
VRD-B22EF472J
VRD-B22EF153J
VRD-B22EF472J
VRD-B22EF153J
VRN-NT2EC183FA
VRN-NT2EC331FT
VRN-B22EK222F
VRD-B22EF561J
RR-DZA176DRE0
RR-DZA176DRE0
VRD-B22EF473J
VRD-B22EF472J
VRD-B22EF472J
VHEHZ4A2///-2
QSW-PA029DRE0
FPNLCB648WRKZ
HDECAA231WRPZ
HDECQA228WRTZ
XEBSD30P08000
FUNTKB117WREZ
GMADIA115WRFZ
LANGKA997WRPZ
XEBSD30P08000
PCUSGA583WREZ
DESCRIPTION
Relay (VE-24HE-K)
Buzzer (PKM22EPT)
Varistor (10G471K)
CPU unit
20-pin harness 8pin (WH-A) (WH-B)
6-pin harness P-P (WH-C)
Holder
Fluorescent display tube
3-pin harness
Capacitor
10µF 50V
Capacitor
0.1µF 50V
Capacitor
0.1µF 50V
Capacitor 0.01µF 16V
Capacitor
0.1µF 50V
Capacitor
0.1µF 50V
Capacitor 0.01µF 16V
Capacitor 0.01µF 16V
Capacitor 0.01µF 16V
Capacitor 0.01µF 16V
Capacitor 0.01µF 16V
Ceramic resonator
Diode (1SS133)
LSI
EEP rom (AT24C01)
Light emitting diode
Transistor (KRA117M)
Transistor (KRA101M)
Transistor (KRC101M)
Transistor (KRA101M)
Resistor 1.5k ohm 1/4W
Resistor 3.3k ohm 1/4W
Resistor 4.7k ohm 1/4W
Resistor 15k ohm 1/4W
Resistor 4.7k ohm 1/4W
Resistor 15k ohm 1/4W
Resistor 4.7k ohm 1/4W
Resistor 15k ohm 1/4W
Resistor 18k ohm 1/4W
Resistor 330 ohm 1/4W
Resistor 2.2k ohm 1/4W
Resistor 560 ohm 1/4W
Resistor 100k ohm x 10
Resistor 100k ohm x 10
Resistor 47k ohm 1/4W
Resistor 4.7k ohm 1/4W
Resistor 4.7k ohm 1/4W
Zener diode (HZ4A2)
Tact switch
Panel sub assy
Sus decoration
Panel decoration
Special screw
Key sheet
Display window
Panel angle
Screw ; 3mm x 8mm
Cushion
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
FDUC-A360WRKZ
PZETEA084WRFZ
LANGQA549WRPZ
MCAMPA102WRFZ
NSFTTA143WREZ
PCUSUA594WRPZ
PFTA-A030WRWZ
LANG-A093WRPZ
LANGFA220WRPZ
PDUC-A794WRTZ
PFIL-A020WREZ
LANGFA221WRPZ
PDUC-A795WRTZ
FANGTA167WRKZ
FDUC-A358WRKZ
Damper duct assembly
PWB mounting angle
Motor mounting angle
Damper cam
Damper shaft
Damper cushion
Damper
Catalyst angle
Heater mounting angle A
Heater duct upper
Catalyst
Heater mounting angle B
Heater duct left
Coupling assembly
Exhaust duct
Q'TY
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
8
1
1
11
1
9
1
2
1
1
4
1
1
1
1
1
1
1
1
11
1
1
1
1
1
1
30
1
1
1
7
1
1
1
24
1
CODE
AH
AG
AE
BN
AG
AE
AD
AX
AP
AB
AB
AB
AA
AB
AB
AA
AA
AA
AA
AA
AC
AA
AY
AN
AD
AB
AB
AB
AB
AA
AB
AA
AA
AA
AA
AA
AA
AA
AA
AB
AB
AD
AD
AA
AA
AA
AA
AH
BC
AU
AN
AA
AM
AD
AL
AA
AH
1
1
1
1
1
1
1
3
1
1
3
1
1
1
1
AM
AL
AM
AD
AB
AB
AC
AE
AD
BB
BC
AE
BB
AK
AL
OVEN PARTS
44
R-90GC
∆
∆
∆
REF. NO.
4-16
4-17
4-18
4-19
4-20
4-21
4-22
4-23
4-24
4-25
4-26
4-27
4-28
4-29
4-30
4-31
4-32
4-33
4-34
4-35
4-36
4-37
4-38
4-39
4-40
4-41
4-42
4-43
4-44
4-45
4-46
4-47
4-48
4-49
4-50
4-51
4-52
4-53
4-54
4-55
4-56
4-57
4-58
4-59
4-60
4-61
4-62
4-63
4-64
4-65
4-66
PART NO.
FFANMA015WRKZ
LANGFA223WRPZ
PDUC-A798WRPZ
PFPF-A229WREZ
PREFHA066WRWZ
PSKR-A375WRWZ
PSKR-A376WRWZ
*************
LANG-A088WRPZ
LANGQA555WRPZ
LANGQA563WRPZ
PSKR-A373WRPZ
PCUSUA601WREZ
PCUSUA600WREZ
PFPF-A225WRPZ
PSKR-A377WRFZ
PFPF-A227WRPZ
PFPF-A228WRPZ
PGLSPA579WRZZ
PPACGA189WREZ
PREFHA065WRPZ
PREFHA067WRPZ
PREFHA068WRPZ
LANGQA552WRPZ
LBNDKA152WRPZ
FHNG-A295WRYZ
FHNG-A296WRYZ
PHOK-A125WRFZ
PHOK-A126WRFZ
GCOVHA438WRFZ
LANG-A089WRPZ
LANGFA217WRWZ
LANGKB003WRWZ
MCAMPA100WRMZ
MCAMPA101WRMZ
MSPRTA208WREZ
PCOVPA379WREZ
PCUSUA599WREZ
GCOVHA446WREZ
PCUSGA584WREZ
PCUSUA589WREZ
PCUSGA585WREZ
PCUSUA591WREZ
PCUSUA592WREZ
PCOVPA389WREZ
PCUSUA614WREZ
PCUSUA609WREZ
PCUSUA610WREZ
PCUSUA611WREZ
PCUSUA612WREZ
PCUSUA613WREZ
DESCRIPTION
Convection fan assembly
Convection motor mounting angle
Convection duct
Thermal insulator back
Thermal cover back
Divide plate A
Divide plate B
Oven cavity (Not replaceable part)
Turntable mounting angle
Separator left
Lamp mounting angle
Magnetron separator
Cushion
Cushion
Thermal insulation L
Rear separator
Thermal insulation Upper
Thermal insulation Bottom
Lamp glass
Silcon packing
Thermal cover Upper
Thermal cover Left
Thermal cover D
Fan motor mounting angle
Capacitor holder
Oven hinge Left
Oven hinge Right
Latch hook Right
Latch hook Left
Exhaust cover
Transformer mounting angle
Chassis support
Magnetron guide
Door cam Left
Door cam Right
Door spring
Waveguide cover
Cushion
Screw cap
Cushion
Cushion
Cushion
Cushion
Cuhsion
Edge cover
Cushion
Cushion
Cushion
Cushion
Cushion
Cushion
Q'TY
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
2
1
1
1
2
1
1
1
2
3
1
1
1
1
1
1
CODE
AQ
AM
AR
AP
AN
AE
AF
-AE
AF
AH
AH
AB
AC
AR
AH
AS
AQ
AF
AE
AR
AN
AK
AF
AE
AH
AH
AE
AE
AH
AE
AF
AE
AF
AF
AC
AE
AE
AC
AB
AC
AB
AD
AC
AC
AB
AD
AE
AB
AC
AC
1
1
2
2
4
1
1
1
1
2
1
1
1
2
1
1
2
1
1
16
6
BH
BF
AH
AG
AA
AR
BA
AY
AT
AG
AQ
AD
AD
AF
AX
AU
AK
AC
AC
AB
AB
DOOR PARTS
∆
∆
∆
∆
∆
5- 1
5- 2
5- 3
5- 4
5- 5
5- 6
5- 7
5- 8
5- 9
5-10
5-11
5-12
5-13
5-14
5-15
5-16
5-17
5-18
5-19
5-20
5-21
DDORFB039WRYZ
JHNDPA210WREZ
JHNDPA211WRFZ
MJNTPA002WRFZ
XCPWW30P10000
GCOVHA439WRFZ
GWAKPA860WRFZ
HDECAA230WRPZ
HDECQA227WRTZ
LANGKA989WRPZ
LANGKA990WRPZ
LSTPPA214WRFZ
LSTPPA215WRFZ
MSPRCA139WREZ
PGLSPA577WREZ
PGLSPA578WREZ
MLEVFA088WRWZ
MSPRCA137WREZ
MSPRCA138WREZ
XEPSD40P08000
XEPSD40P20000
Door panel assy
Door handle
Door handle cap
Joint
Screw : 3mm x 10mm
Choke cover
Door frame
Stainless cover
Door decoration
Glass mounting angle A
Glass mounting angle B
Latch head Right
Latch head Left
Handle spring
Front door glass
Middle door glass
Handle lever
Latch spring Right
Latch spring Left
Screw : 4mm x 8mm
Screw : 4mm x 20mm
45
R-90GC
REF. NO.
5-22
5-23
PART NO.
LPIN-A179WREZ
LX-BZ0139WRE0
Handle pin
Special screw
DESCRIPTION
Q'TY
2
2
CODE
AG
AA
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AH
AH
AP
AU
AR
AZ
AL
AH
BF
AN
AD
AA
AK
AK
AH
AA
AB
AC
4
55
6
12
4
3
6
4
2
4
4
57
3
7
1
1
11
3
2
2
1
AB
AB
AA
AC
AA
AA
AA
AA
AC
AA
AC
AA
AA
AB
AA
AB
AC
AA
AA
AA
AB
MISCELLANEOUS
666666666666666666-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
FAMI-A108WRMZ
FAMI-A109WRMZ
FROLPA100WRYZ
NTNT-A113WRHZ
PSLD-A030WRHZ
TCADCA778WRRZ
TINSEA940WRRZ
TLABNA722WRRZ
FW-VZB919WREZ
FW-VZB920WREZ
LBSHCA012WRE0
LHLDWQ004YBE0
TCAUAA274WRRZ
TCAUAA275WRRZ
TCAUAA276WRRZ
PZET-A011WRE0
LHLDWA029WRE0
LHLDWA013WRE0
High rack assembly
Low rack assembly
Turntable support
Turntable tray
Splash guard
Cook book
Instruction book
Recipe sheet
Main wire harness
Thermistor harness
Cord bushing
Purse lock L
Monitor caution
DHHS caution label
User caution label
Thermal insulator
Cord holder
Purse lock LL
777777777777777777777-
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
XNEWW40-32000
XOTWW40P08000
XBTSD40P06000
XHPSD40P08K00
XHTSD40P08RV0
XOPSD40P08000
XOTSD40P08000
XOTSD40P12000
LX-CZA070WRE0
XOTSE40P12000
LX-EZA060WREZ
XOTSD40P10000
XHTSD40P08000
LX-BZA144WREZ
XOTSD40P12RV0
LX-BZA143WREZ
XFPSD30P10000
XEPSD30P10000
LX-CZ0052WRE0
XCPSD40P08000
XBPSD30P14K00
Nut: 4mm x 3.2mm
Screw : 4 mm x 8 mm
Screw : 4 mm x 6 mm
Screw : 4 mm x 8 mm
Screw : 4mm x 8mm
Screw : 4mm x 8mm
Screw : 4mm x 8mm
Screw : 4mm x 12mm
Special screw (Torx tamper proof screw)
Screw : 4mm x 12mm
Special screw
screw : 4mm x 10mm
Screw : 4mm x 8mm
Special screw
Screw : 4mm x 12mm
Special screw
Screw : 3 mm x 10 mm
Screw : 3 mm x 10 mm
Special screw
Screw : 4mm x 8mm
Screw : 3mm x 14mm
SCREWS NUTS AND WASHERS
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER
3. PART NO.
2. REF. NO.
4. DESCRIPTION
Order Parts from the authrized SHARP parts Distributor for your area.
Defective parts required return should be returned as indicated in the Service Policy.
46
G
H
1
2
3
47
6-13
1-13
4-37
1-4
7-2
x4
4
7-2
5
4-52
6-15
1-7
7-7
4-23
7-19
7-2
4-9
4-8
4-38
7-4
4-33
4-34
1-19
4-18
4-22
x2
1-1
4-43
4-47
7-12
2-3
7-4
2-2
4-41
4-29
7-12
7-17
7-12
7-11 x4 1-24
7-2
7-4
7-12
6
7-12
7-12
x4
4-2
3-1
4-54
7-4
x2
7-12
7-12
7-5
1-13
7-17 x2
4-53
1-23
7-5
7-12
7-18
x3
1-6
4-17
4-54
6-17
7-3
7-7
4-58
7-10
1-22
4-46
7-12
2-3
7-12
7-15
4-51
4-49
7-12
7-2
7-12 x3
1-5
4-19
4-20
4-48
7-2
4-66
7-6
7-6
7-2 x4
7-2
4-21
7-2
7-2
x4
4-8
1-15
4-64
7-12
4-16
7-2
4-11
1-14
7-17
x2
4-26
7-17
1-2
7-4
x2
x3
4-27
x2
4-29
4-42
4-51
4-50
4-31
7-12
2-1
4-60
7-3
6-11
7-12
7-12
7-12
1-9
7-10
1-8
4-28
4-65
4-45
7-12
7-9
7-12
x3
4-57
7-8
6-14
7-9
5
7-4
4-14
7-4
7-16
4-35
4-44
4-55
1-3
7-2
1-20
1-17
4-3
7-20
7-8
4
4-24
7-14
7-2
7-12
7-14
4-10
7-1
7-19
4-12
1-1
1-12
7-14
4-8
4-47
7-12
7-2
7-2
4-11
7-12
7-2
4-32
7-12
7-20
4-4
1-1
4-5
2-4
B
6-3
6-4
7-1
4-30
x2
7-12
1-18
4-1
7-21
4-7
3
4-13
7-2
7-2
7-5
7-13
4-39
4-59
7-7
4-6
A
7-17
1-16
7-12
7-12
4-62
4-56
2
7-7
7-2
1-21
7-17
x2
4-61
1-11
1-12
7-13 x2
F
7-4
7-2
4-36
4-25
1
4-40
7-12
1-10
7-7
D
7-4
1-8
7-7
C
4-60
7-12
4-60
4-59
4-63
E
4-15
OVEN AND CABINET PARTS
R-90GC
6
A
B
C
D
E
F
G
H
R-90GC
2
1
4
3
6
5
3-7
3-2
x7
3-7
x7
CONTROL PANEL PARTS
A
A
3-7
x8
3-7
3-2-1C
B
B
3-3-3
x7
3-2-1D
3-6
3-3
3-8
3-7
C
C
3-5
3-3-1
DOOR PARTS
3-4
3-3-2
5-21
5-14
5-21
D
5-23
5-3
5-17
5-13
5-5
5-21
5-22
D
5-14
5-17
5-6
5-19
5-4
5-5
E
E
5-1
5-2
5-21
5-3
5-4
5-16
5-22
5-20
5-11
5-20
F
F
x2
5-20
5-10
5-20
x10
5-12
5-20
x2
5-18
G
5-23
G
5-10
5-15
5-7
H
H
5-9
5-8
1
2
4
3
48
5
6
R-90GC
2
1
4
3
6
5
MISCELLANEOUS
A
A
6-1
6-9
6-10
6-16
B
B
6-2
Actual wire harness may be different than illustration.
6-5
Main wire
harness
Toch control
transformer
6-12
20-pin wire
harness
6-18
C
6-12 Pursu lock L
Main wire harness
Power unit
6-18 Pursu lock LL
C
POSITION OF PURSE LOCK
PACKING AND ACCESSORIES
D
D
6-2 LOW RACK
TRAY HOLDER
(SPADFA530WREZ)
TOP PAD ASSEMBLY
FPADBA483WRKZ
6-1 HIGH RACK
DOOR PROTECTION SHEET
SPADPA620WREZ
6-5 SPLASH GUARD
PLASTIC BAG
SSAKHA075WREZ
6-4 TURNTABLE TRAY
E
E
6-6 COOK BOOK
6-7 INSTRUCTION BOOK
6-8 RECIPE SHEET
MICROWAVE OVEN
F
F
6-3 TURNTABLE SUPPORT
BOTTOM PAD ASSEMBLY
FPADBA484WRKZ
G
G
TRAY PAD
PACKING CASE
SPADPA621WREZ
SPAKCD752WREZ
Not replaceable items.
H
H
1
2
4
3
49
5
6
R-90GC
COPYRIGHT © 2002 BY SHARP
CORPORATION
ALL RIGHTS RESERVED.
No part of this publication may be reproduced,
stored in retrieval systems, or transmitted in any
form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, without
prior written permission of the publisher.
'02 SHARP CORP. (7S1.700E) Printed in U.S.A
Download PDF