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,
R-21JCA-F
contact with following parts may result in a severe, possibly fatal,
electrical shock. (High Voltage Capacitor, High Voltage Power
Transformer, Magnetron, High Voltage Rectifier Assembly, High
Voltage Harness etc..)
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ................... INSIDE FRONT COVER
BEFORE SERVICING ......................................................................................................INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL ................................................................................................................ 1
GENERAL INFORMATION ................................................................................................................................... 4
TEST PROCEDURE ............................................................................................................................................ 10
TOUCH CONTROL PANEL ................................................................................................................................. 16
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 20
CONTROL PANEL CIRCUIT .............................................................................................................................. 28
PARTS LIST ........................................................................................................................................................ 30
PACKING AND ACCESSORIES ......................................................................................................................... 34
SHARP CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
R-21JCA-F
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 oven 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 the 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.
WARNING TO SERVICE PERSONNEL
Don't Touch !
Danger High Voltage
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with
following parts
fatal, electrical shock.
(Example)
High Voltage Capacitor, High Voltage Power Trans-
former, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
may result in a severe, possibly
R-21JCA-F
Before Servicing
1. Disconnect the power supply cord ,and then
remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
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.
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.
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.
After repairing
1. Reconnect all leads removed from components during
testing.
2. Reinstall the outer case (cabinet).
3. Reconnect the power supply cord after the outer case is
installed.
4. Run the oven and check all functions.
Microwave ovens should not be run empty. To test for the
presence of microwave energy within a cavity, place a cup of
cold water on the oven turntable, close the door and set the
power to HIGH and set the microwave timer for two (2) minutes.
When the two minutes has elapsed (timer at zero) carefully
check that the water is now hot. If the water remains cold carry
out Before Servicing procedure and re-examine the connections to the component being tested.
When all service work is completed and the oven is fully
assembled, the microwave power output should be checked
and microwave leakage test should be carried out.
When the testing is completed,
1
R-21JCA-F
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.
2
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm
, 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
SERVICE MANUAL
R-21JCA-F
LIGHT DUTY
COMMERCIAL
MICROWAVE OVEN
R-21JCA-F
FOREWORD
This Manual has been prepared to provide Sharp Electronics Corp.
Service Personnel with Operation and Service Information for the SHARP
MICROWAVE OVENS, R-21JCA-F.
It is recommended that service personnel carefully study the entire text of
this manual so that they will be qualified to render satisfactory customer
service.
Check the interlock switches and the door seal carefully. Special attention
should be given to avoid electrical shock and microwave radiation hazard.
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is no other visible damage with the oven.
Servicing and repair work must be carried out only by trained service
personnel.
DANGER
Certain initial parts are intentionally not grounded and present
a risk of electrical shock only during servicing. Service personnel - Do not contact the following parts while the appliance is
energized;
High Voltage Capacitor, Power Transformer, Magnetron, High
Voltage Rectifier Assembly, High Voltage Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.
PRODUCT DESCRIPTION
GENERAL INFORMATION
OPERATION
TROUBLESHOOTING GUIDE AND
TEST PROCEDURE
TOUCH CONTROL PANEL
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
WIRING DIAGRAM
PARTS LIST
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-21JCA-F
3-Pronged Plug
Grounded
Receptacle Box
Grounding Pin
3-Pronged Receptacle
SPECIFICATION
ITEMDESCRIPTION
Power Requirements120 Volts
14 Amperes
60 Hertz / Single phase, 3 wire grounded
NOTE: Internal capacity is calculated by measuring
maximum width, depth and height.
Actual capacity for holding food is less.
GENERAL INFORMATION
GROUNDING INSTRUCTIONS
This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed and
grounded in accordance with the National Electrical Code and local codes and ordinances.
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric
current.
WARNING: Improper use of the grounding plug can result in a risk of electric shock.
Electrical Requirements
The electrical requirements are a 120 volt 60 Hz, AC only,
15 amp. or more protected electrical supply. It is recommended that a
separate circuit serving only this appliance be provided. When installing this
appliance, observe all applicable codes and ordinances.
A short power-supply cord is provided to reduce risks of becoming entangled
in or tripping over a longer cord.
Where a two-pronged wall-receptacle is encountered, it is the personal
responsibility and obligation of the customer to contact a qualified electrician
and have it replaced with a properly grounded three-pronged wall receptacle
or have a grounding adapter properly grounded and polarized. If the
extension cord must be used, it should be a 3-wire, 15 amp. or higher rated
cord. Do not drape over a countertop or table where it can be pulled on by
children or tripped over accidentally.
CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS
PLUG.
4
1. Back splash cover
2. Side splash cover
3. Oven light
4. Ceramic shelf
5. Control panel
6. Cavity face plate
7. Door latch openings
8. Door latches
9. Door hinges
10.Door seals and sealing surfaces
11.Door handle
12.Oven door with see-through
window
13.Air ventilation cover and openings
14.Power supply cord
15.Air intake openings
16.Outer case cabinet
11
OVEN DIAGRAM
1
912
4
10
8
CONTROL PANEL
32
76
R-21JCA-F
14
13
15
16
5
TIME GUIDE FOR ONE SERVING
15 - 30 sec.
Bagel, Roll
Muffin, Pastry
Pie Slice
1 - 2 min.
Beverage, Soup
Large Sandwich
Popcorn, 1.5 oz.
40
30
C
20
B
10
A
0
6
INSTRUCTIONS
With the door closed,turn the timer to
the desired time. Oven will begin
operating immediately.
To shut oven off manually,return timer
to "0".
50
D
T
1
F
E
S
R
5
30 - 60 sec.
Hot Dog
Pizza Slice
Small Sandwich
2 - 3 min.
Casserole, Stew
Chili, Chowder
Popcorn, 3.5 oz.
1.5
G
H
I
2
J
K
L
M
N
O
3
P
Q
4
2.5
Light Up Dial for setting cooking time.
5
R-21JCA-F
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions during
oven operation.
OFF CONDITION
Closing the door activates door sensing switch and secondary
interlock switch. (In this condition, the monitor switch contacts
are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the noise
filter and the control unit (Figure O-1).
COOKING CONDITION
When the Light Up Dial is turned, the following operations
occur:
1. The contacts of relays are closed and components connected
to the relays are turned on as follows.
(For details, refer to Figure O-2)
RELAYCONNECTED COMPONENTS
RY-1Oven lamp/ Antenna motor/ Fan motor
RY-2Power transformer
2. 120 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3.2 volts A.C.
output on the filament winding, and approximately 2150
volts A.C. on the high voltage winding.
3. The filament winding voltage heats the magnetron filament
and the H.V. winding voltage is sent to a voltage doubler
circuit.
4. The microwave energy produced by the magnetron is
channelled through the waveguide into the cavity feed-box,
and then into the cavity where the food is placed to be
cooked.
5. Upon completion of the cooking time, the power transformer,
oven lamp, etc. are turned off, and the generation of
microwave energy is stopped. The oven will revert to the
OFF condition.
6. When the door is opened during a cook cycle, monitor
switch, door sensing switch, secondary interlock switch,
relay (RY2) and primary interlock relay(RY1) are activated
with the following results. The circuits to the antenna motor,
the cooling fan motor, the oven lamp and the high voltage
components are de-energized, and the cooking program
will be canceled when the door was opened.
7. The monitor switch electrically monitors the operation of the
secondary interlock switch and primary interlock relay(RY1)
and is mechanically associated with the door so that it will
function in the following sequence.
When the door opens from the closed position, the primary
(1)
interlock relay(RY1) and secondary interlock switch open
their contacts. Then the monitor switch contacts close.
(2) When the door is closed from the open position, the monitor
switch contacts open first. Then the contacts of the secondary
interlock switch and door sensing switch close.
If the secondary interlock switch and primary interlock relay (RY1) fail
with the contacts closed when the door is opened, the closing of the
monitor switch contacts will form a short circuit through the monitor
fuse, secondary interlock switch, and primary interlock relay(RY1),
causing the monitor fuse to blow.
6
R-21JCA-F
SCHEMATIC
NOTE: CONDITION OF OVEN
1. LIGHT UP DIAL OFF.
2. DOOR CLOSED.
FUSE
AC120V
60 Hz
NL
NOISE FILTER
20A
NOISE SUPPRESSION COIL
LINE CROSS CAPACITOR 0.22 F AC250V
CAPACITOR
LINE BYPASS
0.003300 F / AC 125V
CAPACITOR
LINE BYPASS
0.003300 F / AC 125V
NOTE: Indicates components with potential above 250 V.
The door is opened by grasping the door handle, refer to Figure
D-1.
When the door handle is grasped, the handle lever is pulled.
And then the upper and lower latch heads are moved upward
by the handle lever, and they are released from the latch
hook. Now the door will open.
Handle
Lever
Door
Handle
Latch
Lever
Latch Head
Latch Switch
Lever C
Latch Head
Latch Hook
Latch Switch
Lever A
Secondary
Interlock
Switch
Latch Switch
Lever B
Monitor
Switch
Door
Sensing
Switch
Figure D-1. Door Open Mechanism
DOOR SENSING AND SECONDARY INTERLOCK
SWITCHES
The secondary interlock switch is mounted in the upper position of the latch hook and the door sensing switch in the primary
interlock system is mounted in the lower position of the latch
hook. The secondary interlock switch is activated by the latch
switch lever A. The latch switch lever A is activated by the upper
latch head. The door sensing switch is activated by the latch
switch lever C. The latch switch lever C is activated by the lower
latch head. When the door is opened, the switches interrupt the
power to all high voltage components. A cook cycle cannot take
place until the door is firmly closed thereby activating both
interlock switches. The primary interlock system consists of the
door sensing switch and primary interlock relay located on the
control circuit board.
MONITOR SWITCH
The monitor switch is activated (the contacts opened) by the
latch switch lever B on the latch hook while the door is closed.
The latch switch lever B is activated by the lower latch head.
The switch is intended to render the oven inoperative, by
means of blowing the monitor fuse, when the contacts of the
primary interlock relay (RY1) and secondary interlock switch
fail to open when the door is opened.
Functions:
1. When the door is opened, the monitor switch contacts
close (to the ON condition) due to their being normally
closed. At this time the primary interlock relay (RY1) and
secondary interlock switch are in the OFF condition
(contacts open) due to their being normally open contact
switches.
2. As the door goes to a closed position, the monitor switch
contacts are first opened and then the door sensing switch
and the secondary interlock switch contacts close. (On
opening the door, each of these switches operate inversely.)
3. If the door is opened, and the primary interlock relay (RY1)
and secondary interlock switch contacts fail to open, the
monitor fuse blows simultaneously with closing of the
monitor switch contacts.
CAUTION: BEFORE REPLACING A BLOWN MONITOR
FUSE TEST THE DOOR SENSING SWITCH,
PRIMARY INTERLOCK RELAY (RY1),
SECONDARY INTERLOCK SWITCH AND
MONITOR SWITCH FOR PROPER OPERATION.
(REFER TO CHAPTER “TEST PROCEDURE”).
NOTE: MONITOR FUSE AND MONITOR SWITCH ARE
REPLACED AS AN ASSEMBLY.
ANTENNA MOTOR
The antenna motor rotates the stirrer antenna located on the
bottom of the oven cavity, so that the food on the ceramic
shelf is cooked evenly during cooking. The antenna motor
may turn in either direction.
COOLING FAN MOTOR
The cooling fan motor drives a blade which draws external
cool air. This cool air is directed through the air vanes surrounding the magnetron and cools the magnetron. This air is
channelled through the oven cavity to remove steam and
vapors given off from the heating food. It is then exhausted
through the exhausting air vents at the oven cavity.
MONITOR FUSE
1. The monitor fuse blows when the contacts (COM-NO) of
the primary interlock relay (RY2) and secondary interlock
switch remain closed with the oven door open and when
the monitor switch closes.
2. If the wire harness or electrical components are shortcircuited, this monitor fuse blows to prevent an electric
shock or fire hazard.
THERMAL CUT-OUT 145˚C (MAGNETRON)
This thermal cut-out protects the magnetron against overheating. If the temperature goes up higher than 293˚F (145˚C)
because the fan motor is interrupted or the ventilation openings are blocked, the thermal cut-out will open and line
voltages to the high voltage transformer will be cut off and the
operation of the magnetron will be stopped. The thermal cutout will not resume.
THERMAL CUT-OUT 125˚C (OVEN)
The thermal cut-out located on the top of the oven cavity is
designed to prevent damage to the oven if the food in the
oven catches fire due to over heating produced by improper
setting of the cooking time or failure of control unit. Under
normal operation, the oven thermal cut-out remains closed.
However, when abnormally high temperatures are reached
within the oven cavity, the oven thermal cut-out will open at
257˚F(125˚C) causing the oven to shut down. The thermal
cut-out will not resume.
NOISE FILTER
The noise filter prevents the radio frequency interference that
might flow back in the power circuit.
8
R-21JCA-F
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, primary interlock relay
(RY1), door sensing switch and secondary interlock switch before replacing the monitor fuse. If monitor fuse is
replaced, the monitor switch must also be replaced. Use part FFS-BA015WRK0 as an assembly.
IMPORTANT: Whenever troubleshooting is performed with the power supply cord disconnected. It may in, some cases, be
necessary to connect the power supply cord after the outer case has been removed, in this event,
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.
6. After that procedure, reconnect the power supply cord.
When the testing is completed
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power transformer.
5. Reinstall the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
CONDITION
OFF
CONDITION
COOKING
CONDITION
TEST PROCEDURE
POSSIBLE CASE
AND
DEFECTIVE PARTS
PROBLEM
Home fuse or circuit breaker blows when
power cord is plugged into wall outlet.
Monitor fuse blows when power cord is
plugged into wall outlet.
Oven lamp does not light, and fan motor
and antenna motor do not operate.
Oven does not go into cook cycle when
Light Up Dial turned.
Oven seems to be operating but little or
no heat is produced in oven load. (Food
incompletely cooked or not cooked at all
at end of cook cycle.)
Oven goes into a cook cycle but
extremely uneven heating is produced in
oven load (food).
ABCDEFFGHI JKL
MAGNETRON
POWER TRANSFORMER
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE CAPACITOR
THERMAL CUT-OUT
SECONDARY INTERLOCK SWITCH
PRIMARY INTERLOCK SYSTEM
MONITOR SWITCH
MONITOR FUSE
NOISE FILTER
CONTROL PANEL
RELAY (RY2)
FOIL PATTURN ON P.W.B.
RE RE RE RE RE
OVEN LAMP OR SOCKET
COOLING FAN MOTOR
ANTENNA MOTOR
CK CK CK
WRONG OPERATION
SHORTED IN POWER CORD
SHORT OR OPENED WIRING
LOW VOLTAGE
DIRTY OVEN CAVITY
9
R-21JCA-F
PROCEDURE
LETTER
TEST PROCEDURES
COMPONENT TEST
AMAGNETRON ASSEMBLY TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across
the magnetron filament leads should indicate less than 1 ohm.
5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and
chassis ground. This test should indicate an infinite resistance. If there is little or no resistance the
magnetron is grounded and must be replaced.
6. Reconnect all leads removed from components during testing.
7. Reinstall the outer case (cabinet).
8. Reconnect the power supply cord after the outer case is installed.
9. Run the oven and check all functions.
MICROWAVE OUTPUT POWER
The following test procedure should be carried out with the microwave oven in a fully assembled condition
(outer case fitted).
HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE
OBSERVED.
Power output of the magnetron can be measured by performing a water temperature rise test. This test should
only be used if above tests do not indicate a faulty magnetron and there is no defect in the following
components or wiring: silicon rectifier, high voltage capacitor and power transformer. This test will require a
16 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple type temperature
tester. For accurate results, the following procedure must be followed carefully:
1. Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water with a
thermometer or thermocouple temperature tester. Stir the thermometer or thermocouple through the water
until the temperature stabilizes. Record the temperature of the water.
2. Place the cup of water in the oven. Operate oven at POWER 10(HIGH) selecting more than 60 seconds
cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second hand of a watch
or the digital read-out countdown.
3. Remove the cup from the oven and again measure the temperature, making sure to stir the thermometer
or thermocouple through the water until the maximum temperature is recorded.
4. Subtract the cold water temperature from the hot water temperature. The normal result should be 34.7 to
64.6˚F(19.3 to 35.9˚C) rise in temperature. If the water temperatures are accurately measured and tested
for the required time period the test results will indicate if the magnetron tube has low power output (low
rise in water temperature) which would extend cooking time or high power output (high rise in water
temperature) which would reduce cooking time. Because cooking time can be adjusted to compensate for
power output, the magnetron tube assembly should be replaced only if the water temperature rise test
indicates a power output well beyond the normal limits. The test is only accurate if the power supply line
voltage is 120 volts and the oven cavity is clean.
BPOWER TRANSFORMER TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter.
Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil
should be less than 1 ohm and the resistance of the high voltage coil should be approximately 85 ohms;
the resistance of the filament coil should be less than 1 ohm.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)
10
PROCEDURE
LETTER
CHIGH VOLTAGE RECTIFIER TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across
the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading. If a short
is indicated in both directions, or if an infinite resistance is read in both directions, the rectifier is probably
defective and should be replaced.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts.
DHIGH VOLTAGE CAPACITOR TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and
check for a short or open between the terminals using an ohmmeter.
Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicate continuity
for a short time and should indicate an open circuit once the capacitor is charged. If the above is not the
case, check the capacitor with an ohmmeter to see if it is shorted between either of the terminals and case.
If it is shorted, replace the capacitor.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
R-21JCA-F
TEST PROCEDURES
COMPONENT TEST
ETHERMAL CUT-OUT TEST 125˚C (OVEN)
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. A continuity check across the thermal cut-out terminals should indicate a closed circuit unless the
temperature of the thermal cut-out reaches approximately 257˚F(125˚C).
An open thermal cut-out indicates overheating of the oven, exchange the thermal cut-out and check inside
of oven cavity and for improper setting of cooking time or operation of control unit. Check for restricted air
flow through the vent holes of the oven cavity, especially the cooling fan and air guide.
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.
THERMAL CUT-OUT TEST 145˚C (MAGNETRON)
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. A continuity check across the thermal cut-out terminals should indicate a closed circuit. If the temperature
of the magnetron reaches approximately 293˚F(145˚C), the thermal cut-out opens. An open thermal cutout indicates overheating of the magnetron. Check for restricted air flow to the magnetron, especially the
cooling fan air guide.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE,
REPLACE THERMAL CUT-OUT.
11
R-21JCA-F
SCREW
DRIVER
MONITOR
SWITCH
OHMMETER
WHT/ WHT
PROCEDURE
LETTER
TEST PROCEDURES
COMPONENT TEST
FSECONDARY INTERLOCK SWITCH TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. 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.
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.
PRIMARY INTERLOCK SYSTEM TEST
DOOR SENSING SWITCH
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal of
the switch. The meter should indicate an open circuit with the door open and a closed circuit with the door
closed. If improper operation is indicated, replace the door sensing switch.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
NOTE: If the door sensing switch contacts fail in the open position and the door is closed, the cooling
fan, antenna and oven light will be activated by RY1.
PRIMARY INTERLOCK RELAY (RY1)
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect two (2) wire leads from the male tab terminals of the Primary Interlock Relay. Check the state
of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay contacts are closed,
replace the circuit board entirely or the relay itself.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
GMONITOR SWITCH TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Before performing this test, make sure that the secondary interlock switch and the primary interlock 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 switch,
reconnect the wire lead to the monitor switch
(COM) terminal and check the continuity of
the monitor circuit.
5. Reconnect all leads removed from
components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the
outer case is installed.
8. Run the oven and check all functions.
12
PROCEDURE
LETTER
HBLOWN MONITOR FUSE TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary interlock
switch and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the
blown monitor fuse.
CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK
RELAY, 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-BA015WRK0, 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.
R-21JCA-F
TEST PROCEDURES
COMPONENT TEST
INOISE FILTER TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the lead wires from the terminal the noise
filter. Using an ohmmeter, check between the terminals
as described in the following table. If incorrect reading are
obtained, replace the noise filter.
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.
MEASURING POINTINDICATION OF OHMMETER
Between N and LOpen circuit
Between terminal N and WHITEShort circuit
Between terminal L and REDShort circuit
JCONTROL PANEL ASSEMBLY TEST
WARNING : To prevent an electric shock do not touch the electrical parts and the printed wiring
board. Because the control unit is "TRANSLESS CIRCUIT" and many electrical parts
are used at A.C. line voltage.
NL
LINE CROSS CAPACITOR 0.22 F AC250V
NOISE SUPPRESSION COIL
LINE BYPASS
CAPACITOR
0.003300 F / AC 125V
WHITERED
LINE BYPASS
CAPACITOR
0.003300 F / AC 125V
FUSE
20A
NOISE FILTER
The control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike conventional microwave ovens, proper maintenance cannot be performed with only a
voltmeter and ohmmeter. In this service manual 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.
13
R-21JCA-F
PROCEDURE
LETTER
TEST PROCEDURES
COMPONENT TEST
6) After that procedure, re-connect the power supply cord.
1. Control Panel
The following symptoms indicate a defective control unit.
1-1 In connection with LEDs
a) At a certain LED, all or some LEDs do not light up.
b) At a certain LED, brightness is low.
c) Only one LED does not light up.
d) All or some LEDs continue to light up.
e) A certain group of LEDs do not light up.
f) The LEDs flicker.
1-2 Other possible troubles caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock is not possible.
c) Cooking time can not be set.
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.
KRELAY TEST
1. Disconnect the power supply cord and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between Pin No. 5 of the 3 pin connector (A) and the common
terminal of the relay RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1 AND RY2 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated ................. Defective relay.
DC. voltage not indicated ........... Check diode which is connected to the relay coil. If diode is
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.
good, control unit is defective.
RY1Approx. 19.2V D.C.Oven lamp / Antenna motor / Cooling fan motor
RY2Approx. 19.9V D.C.Power transformer
The voltage under the condition when all LEDs light up.
14
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
LFOIL PATTERN ON THE PRINTED WIRING BOARD TEST
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the PWB,
this foil pattern acts as a fuse.
1. Foil pattern check and repairs.
1) Disconnect the power supply cord and then remove outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Follow the troubleshooting guide given below for repair.
STEPSOCCURRENCECAUSE OR CORRECTION
1Only pattern at "a" is broken.*Insert jumper wire J1 and solder.
2Pattern at "a" and "b" are broken.*Insert the coil RCILF2003YAZZ between "c" and "d".
5) Make a visual inspection of the varistor.
Check for burned damage.
R-21JCA-F
VRS1
5
CNA
RY1
c
RY2
a
d
J1
b
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 function.
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.
STEPSOCCURRENCECAUSE OR CORRECTION
The rated AC voltage is not present between
1Pin No. 5 of the 3-pin connector (A) and theCheck supply voltage and oven power cord.
common terminal of the relay RY1.
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.
15
R-21JCA-F
TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
Control Unit
Control unit consists of LSI, power source circuit, synchronizing signal circuit, reset circuit, buzzer circuit, encoder circuit
and indicator circuit.
1) LSI
This LSI controls the encoder signal, relay driving signal for
oven function, buzzer signal and LED signal.
2) Power Source Circuit
This circuit generates voltage necessary in the control unit.
SymbolVoltageApplication
VC+5V (*)LSI(I-1)
VR+20V (*)RELAY(RY1, RY2)
(*) The voltage under the condition when all LEDs light up.
The voltage VR will vary according to the quantity of the
LEDs which light up.
3) Synchronizing Signal Circuit
The power source synchronizing signal is available in order
to compose a basic standard time in the clock circuit. It
accompanies a very small error because it works on
commercial frequency.
4) Reset Circuit
A circuit to generate a signals which resets the LSI to the
initial state when power is supplied.
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (completion sound).
6) Door Sensing Switch
A switch to “tell” the LSI if the door is open or closed.
7) Relay Circuit
To drive the magnetron, fan motor, antenna motor and light
the oven lamp.
8) Encoder
The encoder generates the pulse signal, and the pulse
signal is sent to the LSI.
9) Indicator Circuit
Indicator elements are the Light-emitting diodes (LD1LD20).
This circuit consists of 4-digits and 5 segments.
DESCRIPTION OF LSI
LSI
The I/O signal of the LSI is detailed in the following table.
Pin No.SignalI/ODescription
1D3OUTSegment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD1, LD6, LD11 and LD16).
2D4OUTDigit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD16 - LD20).
3D5OUTDigit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD11 - LD15).
4D6OUTDigit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD6 - LD10).
5D7OUTDigit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD1 - LD5).
6P20INConnected to VDD terminal.
7P21INConnected to VSS terminal.
8P22INSignal coming from encoder.
When the encoder is turned, the contacts of encoder make pulse signals. And pulse
signals are input into P22.
16
Pin No.SignalI/ODescription
R-21JCA-F
9
RESET
INAuto 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.
10CNVSSINPower source voltage.
The power source voltage to drive the LSI is input to CNVSS terminal.
11XOUTOUTInternal clock oscillation frequency control output.
Output to control oscillation input of XIN.
12XININInternal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with
respect to XOUT terminal.
13VSSINPower source voltage: 0V.
The power source voltage to drive the LSI is input to VSS terminal. Connected to VC.
14VDDINPower source voltage: +5V.
The power source voltage to drive the LSI is input to VDD terminal.
15N.FINConnected to VSS terminal.
16INT0INSignal coming from encoder.
Signal similar to P22. Pulse signals are input into INT0.
17INT1INSignal to synchronize LSI with commercial power source frequency.
This is basic timing for all real time processing
of LSI.
16.7 msec
H : +5V
L: 0V
18AIN0INInput signal which communicates the door open/close information to LSI.
Door closed; "L" level signal.
Door opened; "H" level signal.
19-21
AIN1-AIN3
INTerminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
22P00OUTTerminal not used.
23P01OUTMagnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2). In 100% power operation, the signals hold
"H" level during microwave cooking and "L" level while not cooking.
24P02OUTOven lamp, turntable motor and fan motor driving signal(Square Waveform :
60Hz).
16.7 msec
To turn on and off shut-off relay (RY1). The square
waveform voltage is delivered to the relay (RY1)
driving circuit and relay(RY2) control circuit.
25P03OUTSignal to sound buzzer.
Completion sound.
During cooking
2.0 sec
H: +5V
L: 0V
26P10OUTTerminal not used.
27-29P11-P13OUTSegment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD5, LD10, LD15 and LD20).
30D0OUTSegment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD4, LD9, LD14 and LD19).
31D1OUTSegment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD3, LD8, LD13 and LD18).
32D2OUTSegment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD2, LD7, LD12 and LD17).
H
L
17
R-21JCA-F
TOUCH CONTROL PANEL SERVICING
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the circuits.
When handling these parts, the following precautions should
be strictly followed. CMOS LSI have extremely high
impedance at its input and output terminals. For this reason,
it is easily influenced by the surrounding high voltage power
source, static electricity charge in clothes, etc., and
sometimes it is not fully protected by the built-in protection
circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap them in
aluminium foil. Also wrap PW boards containing them in
aluminium foil.
2) When soldering, ground the technician as shown in the
figure and use grounded soldering iron and work table.
approx. 1M ohm
2. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the touch
control panel of the microwave oven and the precautions
you must take when doing so. To perform the servicing,
power to the touch control panel is available either from the
power line of the oven itself or from an external power
source.
(1) Servicing the touch control panel with power supply of
the oven :
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE MICROWAVE OVEN IS STILL LIVE DURING SERVICING AND
PRESENTS A HAZARD .
Therefore, before checking the performance of the touch
control panel,
1) Disconnect the power supply cord and then remove
outer case.
2) Open the door and block it open.
3) Discharge high voltage capacitor.
4) Disconnect the leads to the primary of the power
transformer.
5) Ensure that these leads remain isolated from other
components and oven chassis by using insulation
tape.
6) After that procedure, re-connect the power supply
cord.
After checking the performance of the touch control
panel,
1) Disconnect the power supply cord.
2) Open the door and block it open.
3) Re-connect the leads to the primary of the power
transformer.
4) 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 so long enough that
they may be separated from each other. For those models,
therefore, it is possible to check and repair the controls of
the touch control panel while keeping it apart from the oven
proper; in this case you must short both ends of the door
sensing switch (on PWB) of the touch control panel with a
jumper, which brings about an operational state that is
equivalent to the oven door being closed. As for the sensorrelated controls of the touch control panel, checking them is
possible if the dummy resistor(s) with resistance equal to
that of the controls are used.
(2) Servicing the touch control panel with power supply
from an external power source:
Disconnect the touch control panel completely from the
oven proper, and short both ends of the door sensing switch
(on PWB) of the touch control panel, which brings about an
operational state that is equivalent to the oven door being
closed. Connect an external power source to the power
input terminal of the touch control panel, then it is possible
to check and repair the controls of the touch control panel;
it is also possible to check the sensor-related controls of the
touch control panel by using the dummy resistor(s).
3. Servicing Tools
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
4. Other Precautions
1) Before turning on the power source of the control unit,
remove the aluminium foil applied for preventing static
electricity.
2) Connect the connector of the key unit to the control unit
being sure that the lead wires are not twisted.
3) After aluminium foil is removed, be careful that abnormal
voltage due to static electricity etc. is not applied to the
input or output terminals.
4) Attach connectors, electrolytic capacitors, etc. to PWB,
making sure that all connections are tight.
5) Be sure to use specified components where high
precision is required.
18
PRECAUTIONS FOR USING LEAD-FREE SOLDER
1. Employing lead-free solder
The "Main PWB" of this model employs lead-free solder. This is indicated by the "LF" symbol printed on the PWB and in the
service manual. The suffix letter indicates the alloy type of the solder.
Example:
Sn-Ag-Cu
Indicates lead-free solder of tin, silver and copper.
2. Using lead-free wire solder
When repairing a PWB with the "LF" symbol, only lead-free solder should be used. (Using normal tin/lead alloy solder may
result in cold soldered joints and damage to printed patterns.)
As the melting point of lead-free solder is approximately 40˚C higher than tin/lead alloy solder, it is recommend that a dedicated
bit is used, and that the iron temperature is adjusted accordingly.
3. Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is higher and has poorer wettability, (flow), to prevent damage to the land
of the PWB, extreme care should be taken not to leave the bit in contact with the PWB for an extended period of time. Remove
the bit as soon as a good flow is achieved. The high content of tin in lead free solder will cause premature corrosion of the
bit. To reduce wear on the bit, reduce the temperature or turn off the iron when it is not required.
Leaving different types of solder on the bit will cause contamination of the different alloys, which will alter their characteristics,
making good soldering more difficult. It will be necessary to clean and replace bits more often when using lead-free solder.
To reduce bit wear, care should be taken to clean the bit thoroughly after each use.
R-21JCA-F
19
R-21JCA-F
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:
1. Disconnect the power supply cord.
2. Visually check the door and cavity face plate for damage
(dents, cracks, signs of arcing etc.).
Carry out any remedial work that is necessary before operating the oven.
Do not operate the oven if any of the following conditions exist;
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal is damaged.
4. The door is bent or warped.
Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
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 and block it open.
3) Discharge the high voltage capacitor and wait for 60
seconds.
2. Don’t let the wire leads touch to the followiong parts;
1) High voltage parts:
Magnetron, High voltage transformer, High voltage
capacitor and High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, High voltage transformer, and
Oven cavity.
5. There are defective parts in the door interlock system.
6. There are defective parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven.
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.
3) Sharp edge:
Bottom plate, Oven cavity, Waveguide flange, Chassis
support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch, Switch lever and antenna
motor.
3. Do not catch the wire leads in the outer case cabinet.
4. Insert the positive lock connector until its pin is locked and
make sure that the wire leads do not come off even if the
wire leads are pulled.
5. To prevent an error function, connect the wire leads
correctly, referring to the Pictorial Diagram.
Please refer to ‘OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS’, when carrying out any of the
following removal procedures:
OUTER CASE REMOVAL
To remove the outer case, proceed as follows.
1. Disconnect the power supply cord.
2. Open the oven door and block it open.
3. Remove the five (5) screws from rear and along the side
edge of case.
4. Slide the entire case back about 3cm to free it from retaining
clips on the cavity face plate.
5. Lift the entire case from the oven.
6. Discharge the H.V. capacitor before carrying out any further
work.
7. Do not operate the oven with the outer case removed.
CAUTION: 1. DISCONNECT OVEN FROM POWER SUP
PLY BEFORE REMOVING OUTER CASE.
2. DISCHARGE THE HIGH VOLTAGE CAPACITOR BEFORE TOUCHING ANY OVEN COMPONENTS OR WIRING.
POWER TRANSFORMER REMOVAL
1. Disconnect the power supply cord and then remove outer
case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the filament leads of power transformer from
high voltage capacitor and the magnetron.
5. Disconnect the H.V. wire from the power transformer.
6. Disconnect the main wire harness from the power
transformer.
7. Remove the two (2) screws and two (2) VCP caps holding
the transformer to base plate.
8. Remove the transformer.
9. Now the power transformer is free.
20
HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL
Oven lamp
socket
Terminal
Wire lead
Terminal hole
Flate type small
screw driver
R-21JCA-F
To remove the components, proceed as follows.
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 H.V. wire of the high voltage rectifier assembly
from the magnetron and the power transformer.
5. Disconnect the filament lead of the power transformer from
the high voltage capacitor.
6. Remove one (1) screw holding earth side terminal of the
high voltage rectifier assembly.
7. Disconnect all the leads and terminals of high voltage
rectifier assembly from the high voltage capacitor.
8.
Now, the high voltage rectifier assembly should be free.
MAGNETRON REMOVAL
1. Disconnect the power supply cord and then remove outer
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the high voltage wire of the high voltage rectifier
assembly and filament lead of the transformer from the
magnetron.
5. Remove the one (1) screw holding the airguide to the
magnetron and remove the airguide.
6. Remove the one (1) screw holding the insertion plate A to
the magnetron and remove the insertion plate A.
7. Remove the one (1) screw holding the chassis support to
the magnetron.
9. Remove one (1) screw holding the capacitor holder to the
oven cavity rear plate.
10.Remove one (1) screw holding the fan duct to the oven
cavity rear plate.
11.Release the capacitor holder from the fan duct.
12.Remove the capacitor from the capacitor holder.
13.Now, the capacitor should be free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-
FIER AND HIGH VOLTAGE CAPACITOR,
GROUND SIDE TERMINAL OF THE HIGH VOLTAGE RECTIFIER MUST BE SECURED FIRMLY
WITH A GROUNDING SCREW.
8. Release the tabs of air intake duct from the chassis support
and the oven cavity.
9. Move the air intake duct to the left.
10.Carefully remove four (4) screws holding magnetron to
waveguide, when removing the screws hold the magnetron
to prevent it from falling.
11.Remove the magnetron from the waveguide with care so
the magnetron antenna is not hit by any metal object around
the antenna.
CAUTION: WHEN REPLACING THE MAGNETRON, BE
SURE THE R.F. GASKET IS IN PLACE AND
THE MAGNETRON MOUNTING SCREWS
ARE TIGHTENED SECURELY.
CONTROL PANEL ASSEMBLY REMOVAL
CONTROL PANEL ASSEMBLY
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 main wire harness from the control unit.
5. Remove the one (1) screw holding the control panel assembly
to the oven cavity front plate.
6. Lift up the control panel assembly.
7. Now, the control panel assembly is free.
CONTROL UNIT
8. Remove the five (5) screws holding the control unit to the
control panel frame.
9. Remove the control unit from the control panel frame.
10.Now, the control unit is free.
OVEN LAMP AND LAMP SOCKET REMOVAL
1. Disconnect the power supply cord and then remove outer
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Lift up the oven lamp socket from air intake duct.
5. Pull the wire leads from the oven lamp socket by pushing
the terminal hole of the oven lamp socket with the small flat
type screw driver.
6. Now, the oven lamp socket is free.
TIMER KNOB
11.After removing the control unit, release the tab of the timer
knob from the hole of the control panel.
12.Now, the timer knob is free.
NOTE: 1. Before attaching a new timer sheet, wipe off
remaining adhesive on the control panel frame
surfaces completely with a soft cloth soaked in
alcohol.
2. When attaching the timer sheet to the control panel
frame, adjust the upper edge and right edge of the
timer sheet to the correct position of control panel
frame.
3. Stick the timer sheet firmly to the control panel
frame by rubbing with a soft cloth so not to cause
scratches.
Figure C-1. Oven lamp socket
21
R-21JCA-F
Shaft
Table
Center of
bracket
POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL
1. Disconnect the power supply cord and then remove outer
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Push the lever of positive lock
®
connector.
5. Pull down on the positive lock® connector.
CAUTION: WHEN CONNECTING THE POSITIVE LOCK
CONNECTORS TO THE TERMINALS, INSTALL
THE POSITIVE LOCK® CONNECTOR SO THAT
THE LEVER FACES YOU.
ANTENNA MOTOR REMOVAL
Terminal
Positive lock®
connector
Lever
®
1
Push
2
Pull down
Figure C-2. Positive lock® connector
1. Disconnect the power supply cord.
2. Remove the one (1) screw holding the base plate cover to
the base plate and remove the base plate cover.
3. Disconnect the wire leads from the antenna motor and
COOLING FAN MOTOR REMOVAL
REMOVAL
1.
Disconnect the power supply cord and
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the wire leads from the fan motor.
5. Remove the one (1) screw holding the capacitor holder to
the oven cavity rear plate.
6. Remove the one (1) screw holding the fan duct to the oven
cavity rear plate.
7. Release the tabs of the capacitor holder from fan duct.
8. Remove the fan duct from the oven.
9. Remove the fan blade from the fan motor shaft according to
the following procedure.
10.Hold the edge of the rotor of the fan motor by using a pair
of groove joint pliers.
CAUTION:
* Make sure that no metal pieces enter the gap between
the rotor and the stator of the fan motor because the
rotor is easily shaven by pliers and metal pieces may
be produced.
* Do not touch the pliers to the coil of the fan motor
because the coil may be cut or injured.
* Do not disfigure the bracket by touching with the pliers.
11.Remove the fan blade from the shaft of the fan motor by
pulling and rotating the fan blade with your hand.
12. Now, the fan blade will be free.
then
remove outer case.
remove the one (1) screw holding the antenna motor.
4. Remove the antenna motor shaft from the antenna motor.
5. Now, the antenna motor is free.
CAUTION:
* Do not reuse the removed fan blade because the hole
(for shaft) may be larger than normal.
13.Remove the two (2) screws holding the fan motor to the fan
duct.
14.Now, the fan motor is free.
INSTALLATION
1. Install the fan motor to the fan duct with the two (2) screws.
2. Install the fan blade to the fan motor shaft according to the
following procedure.
3. Hold the center of the bracket which supports the shaft of
the fan motor on the flat table.
4. Install the fan blade to the shaft of fan motor by pushing the
fan blade with a small, light weight, ball peen hammer or
rubber mallet.
CAUTION:
* Do not hit the fan blade hard when installing because
the bracket may be disfigured.
* Make sure that the fan blade rotates smooth after
installation.
* Make sure that the axis of the shaft is not slanted.
5. Install the fan duct to the oven cavity rear plate with the one
(1) screw.
6. Insert the tabs of the capacitor holder to the fan duct.
7. Install the capacitor holder to the oven cavity rear plate with
the one (1) screw.
8. Re-connect the wire leads to the fan motor.
Coil
Stator
Gap
Bracket
Rear View
Rotor
Groove joint pliers
Side View
Axis
Shaft
Stator
Rotor
These are the positions
that should be pinched
with pliers
22
POWER SUPPLY CORD REPLACEMENT
k
R-21JCA-F
Removal
Disconnect the power supply cord and
1.
then
remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Remove the one (1) screw holding the green wire to the
cavity rear plate.
5. Disconnect the wire leads of the power supply cord from the
noisew filter.
6. Release the power supply cord from the oven cavity rear
7. Now, the power supply cord is free.
Re-install
1. Insert the moulding cord stopper of power supply cord into
the square hole of the oven cavity rear plate, referring to the
Figure C-3b.
2. Install the earth wire lead of power supply cord to the cavity
rear plate with one (1) screw and tighten the screw.
3. Connect the wire leads of power supply cord to the noise
filter, referring to the Pictorial Diagram.
plate.
Oven Cavity
Rear Plate
Power Supply Cord
Moulding
Screw
Green
Wire
Black Wire
White Wire
Noise Filter
Chassis
RED
WHT
L
N
Support
Cord Stopper
Power
Supply Cord
Oven Cavity
Rear Plate
Square Hole
Figure C-3a. Power Supply Cord Replacement
Figure C-3b. Power Supply Cord Replacement
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH REMOVAL
1. Disconnect the power supply cord and then remove outer
case.
2. Open the door and block it open.
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.
3. Discharge high voltage capacitor.
4. Remove the control panel assembly referring to "CONTROL
Latch Hoo
PANEL ASSEMBLY REMOVAL".
5. Disconnect the leads from all switches.
6. Remove the two (2) screws holding the latch hook to the
oven cavity.
7. Remove the latch hook.
8. Push the retaining tab outward slightly and remove the
switch.
Re-install
1. Re-install each switch in its place. The door sensing switch
and monitor switch are in the lower position and the
secondary interlock switch is in the upper position.
2. Re-connect wire leads to each switch.
Refer to pictorial diagram.
3. Secure latch hook (with two (2) mounting screws) to oven
flange.
Tab
Figure C-4. Switches
Tabs
Secondary
Interlock
Switch
Tab
Monitor
Switch
Tab
Tab
Door
Sensing
Switch
DOOR SENSING SWITCH/SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH ADJUSTMENT
1. Disconnect the power supply cord and then remove outer
case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
If the door sensing switch, secondary interlock switch and
monitor switch do not operate properly due to a misadjustment,
the following adjustment should be made.
4. Loosen the two (2) screws holding the latch hook to the
oven cavity front flange.
5. With door closed, adjust latch hook by moving it back and
forth, and up and down. In and out play of the door allowed
by the upper and lower position of the latch hook should be
less than 0.5mm. The vertical position of the latch hook
should be adjusted so that the door sensing switch and
secondary interlock switch are activated with the door
closed. The horizontal position of the latch hook should be
adjusted so that the plunger of the monitor switch is pressed
with the door closed.
6. Secure the screws with washers firmly.
7. Check the operation of all switches. If each switch has not
activated with the door closed, loosen screw and adjust the
latch hook position.
23
R-21JCA-F
e
After adjustment, check the following.
1. In and out play of door remains less than 0.5mm when in the
latched position. First check upper position of latch hook,
pushing and pulling upper portion of door toward the oven
face. Then check lower portion of the latch hook, pushing
and pulling lower portion of the door toward the oven face.
Both results (play in the door) should be less than 0.5mm.
2. The door sensing switch and secondary interlock switch
interrupt the circuit before the door can be opened.
3. Monitor switch contacts close when door is opened.
4. Re-install outer case and check for microwave leakage
around door with an approved microwave survey meter.
(Refer to Microwave Measurement Procedure.)
Handle
Lever
Door
Handle
Latch
Lever
Latch Head
Latch Head
Latch Hook
Latch Switch
Lever A
Secondary
Interlock
Switch
Latch Switch
Lever B
Monitor
Switch
DOOR PARTS REMOVAL
CHOKE COVER
1. Disconnect the power supply cord.
2. Open the door slightly.
3. Insert a putty knife (thickness of about 0.5mm) into the gap
between the choke cover and door frame as shown in
Figure C-6 to free engaging parts.
4. Pry the choke cover by inserting a putty knife as shown in
Figure C-6.
5. Release choke cover from door panel.
6. Now choke cover is free.
NOTE: When carrying out any repair to the door, do not
bend or warp the slit choke (tabs on the door
panel assembly) to prevent microwave leakage.
Choke Cover
Putty Knif
Door Frame
Figure C-6. Door Disassembly
7. Release two (2) pins of door panel from two (2) holes of
upper and lower oven hinges by lifting up.
8. Now, door sub assembly is free from oven cavity.
DOOR PANEL REMOVAL
9. Remove the four (4) screws holding the door panel to the
door frame.
10.Release door panel from seven (7) tabs of door frame by
sliding door panel downward.
11.Now, the door panel is free.
DOOR HANDLE REMOVAL
12.Release the latch spring from the tab of the latch angle
assembly.
Latch Switch
Lever C
Door
Sensing
Switch
Figure C-5. Latch Switch Adjustments
13.Remove the two (2) screws holding the door handle and the
latch angle assembly through the door frame.
14.Now, door handle is free.
LATCH HEADS REMOVAL
15.Remove the one (1) screw holding the latch angle assembly
to the door frame.
16.Remove the latch angle assembly together with the latch
lever, latch spring and the upper and lower latch heads from
the door frame.
17.Release the latch lever together with the latch spring and
the latch heads from the latch angle assembly.
18.Release the two (2) latch heads from the latch lever.
19.Now, the upper and lower latch heads are free.
FRONT DOOR GLASS OR SEALER PLATE REMOVAL
(After DOOR PANEL REMOVAL)
12.Remove the four (4) screws holding the glass stopper U to
the door frame and remove the glass stopper U.
13.Remove the two (2) screws holding the glass stopper R to
the door frame and remove the glass stopper R.
14.Slide the front door glass and the sealer plate left at first and
then slide upwards to release them from the tabs holding it.
17.Now, the front door glass or the sealer plate free.
DOOR CASE REMOVAL
(After DOOR PANEL REMOVAL)
12.Straighten all tabs of the door case holding the door case to
the door frame.
13.Release door case from the door frame.
17.Now, the door case is free
NOTE: At this moment, the door badge is attached on the
door case.
RE-INSTALL OF THE DOOR
1. Re-install all door parts except the choke cover.
2. Catch two (2) pins of door panel on two (2) holes of upper
and lower oven hinges.
3. Re-install choke cover to door panel by pushing.
NOTE: After any service to the door;
(A) Make sure that door sensing switch and secondary
interlock switch are operating properly. (Refer to
chapter "Test Procedures".).
24
R-21JCA-F
(B) An approved microwave survey meter should be used
to assure compliance with proper microwave radiation
emission limitation standards. (Refer to Microwave
Measurement Procedure.)
After any service, make sure of the following :
1. Door latch heads smoothly catch latch hook through latch
holes and that latch head goes through center of latch hole.
2. Deviation of door alignment from horizontal line of cavity
face plate is to be less than 1.0mm.
3. Door is positioned with its face pressed toward cavity face
plate.
4. Check for microwave leakage around door with an approved
microwave survey meter. (Refer to Microwave Measurement
Procedure.)
Note: The door on a microwave oven is designed to act as
an electronic seal preventing the leakage of microwave
energy from oven cavity during cook cycle. This
function does not require that the door be air-tight,
moisture (condensation)-tight or light-tight. Therefore,
occasional appearance of moisture, light or sensing
of gentle warm air movement around oven door is not
abnormal and do not in themselves indicate a leakage
of microwave energy from oven cavity.
Upper
Pin
Oven
Hinge
Upper Oven
Hinge
Lower
Choke Cover
Lower
Oven
Hinge
Oven
Hinge
Pin
Door
Panel
Slit
Chok
Figure C-7. Door Replacement
ANTENNA MOTOR SHAFT REPLACEMENT
REMOVAL
1. Disconnect the power supply cord.
2. Open the door and block it open.
3. To discharge the high voltage capacitor, wait for 60 seconds.
4. Remove the antenna motor from the oven cavity bottom plate,
referring to "ANTENNA MOTOR REMOVAL" .
5. Remove the ceramic shelf from the oven cavity bottom
plate.
6. Remove the one (1) screw and the one (1) washer holding
the antenna holder of the stirrer antenna assembly to the
oven cavity bottom plate through the square hole of the
stirrer antenna. Refer to Figure C-8.
7. Release the antenna holder from the one (1) tab of the oven
cavity bottom plate.
8. Remove the stirrer antenna assembly from the oven cavity
bottom plate.
9. Remove the antenna motor shaft from the hole of the oven
cavity bottom plate.
10.Now, the antenna motor shaft is free.
Washer
Square
hole
Screw
Antenna holder
Tab
Stirrer antenna
Antenna
motor shaft
Oven cavity
bottom plate
INSTALLATION
1. Install the antenna motor shaft into the hole of the oven
cavity bottom plate, and turn the flat faces of antenna motor
shaft to the left and right side walls of oven cavity (to fit the
stirrer antenna holder). Refer to Figure C-9.
2. Set the direction of the stirrer antenna and antenna holder
so that the hole of the antenna holder fit to the centre of the
stirrer antenna's big blade. Refer to Figure C-9.
3. Hook the hole of the antenna holder on the tab of the oven
cavity bottom plate. Refer to Figure C-10.
4. Insert the antenna holder into the hole of the oven cavity
bottom plate and fit the hole of the antenna holder with an
antenna motor shaft. Refer to Figure C-10.
5. Install the antenna holder to the oven cavity bottom plate
with the one (1) screw and the one (1) washer. Refer to
Figure C-8.
6. Install the antenna motor to the oven cavity bottom plate with
one (1) screw. Refer to Figure C-8.
7. Connect the wire leads to the antenna motor, referring to the
pictorial diagram.
8. Install the base plate cover to the base plate with one (1)
screw.
9. Install the ceramic shelf to the oven cavity bottom plate.
Refer to "INSTALLATION OF CERAMIC SHELF" .
3. Make sure that the smooth surface of the ceramic shelf face
up.
4. Make sure that the rubber packing without a fin of the
ceramic shelf faces the front of the oven.
NOTE: The three (3) rubber packings with the fins and the
one (1) rubber packing without a fin are attached to
the four (4) edges of the ceramic shelf. The one (1)
rubber packing without a fin is the front edge of the
ceramic shelf.
5. Put the front edge of the ceramic shelf into the front edge of
the oven cavity bottom plate.
6. Push down the rear edge of the ceramic shelf into the oven
cavity bottom plate.
7. Now, the ceramic shelf is installed.
Antenna
motor shaft
Oven cavity bottom plate
Tab
WARNING
Make sure that the rubber packing is not caught between the
oven door and the oven cavity front plate, to avoid possible
exposure to excessive microwave energy.
Oven Cavity
Rear Edge
Push
Ceramic
Front Edge
Shelf
26
R-21JCA-F
FUSE
RED
BLK
L
N
WHT
RED
WHT
WHT
ORG
GRY
THERMAL
CUT-OUT
125˚C(OVEN)
OVEN LAMP
& SOCKET
THERMAL
CUT-OUT
145°C(MAG.)
FAN MOTOR
WHT
ORG
WHT
RED
WHT
HIGH VOLTAGE COMPONENTS
MAGNETRON
H.V.
CAPACITOR
H.V.
RECTIFIER
POWER TRANSFORMER
GRN
POWER SUPPLY
CORD
COM
WHT
WHT
ORG
WHT
WHT
N.C.
N.O.
COM.
CONNECTOR
ORG
ORG
WHT
BLU
BRN
ANTENNA
MOTOR
MONMITOR
SWITCH
PRIMARY
INTERLOCK
RELAY
WHT
BLU
BLU
RED
ORG
RED
ORG
ORG
2
3
4
5
1
YLW
PNK
BLU
CN-A
RY2
RY1
NEUTRAL
HOT
EARTH
PNK
YLW
N.O.
COM.
DOOR SENSING SWITCH
SECONDARY
INTERLOCK
SWITCH
NOTE:
Hot (ORG) wire must be
connected to the terminal
with blue mark on the
oven light socket.
BLUE MARK
RED
BRN
RED
NOISE
FILTER
A
B
C
1
2
3
45
6
A
B
C
D
E
F
G
D
E
Figure S-1. Pictorial Diagram
F
G
H
H
1
2
3
45
6
27
R-21JCA-F
INT0
N.F
VDD
VSS
XIN
XOUT
CNVSS
RESET
D3
D4
D5
D6
D7
P20
P21
P22
AB
C
D4
ICP1
C2
C3
Q1
R1R2
Q2
R5 1K
POWER
TRANSFORMER
D70D71D72D73
DOOR
SENSING
SWITCH
0.1µ/50 V
1000µ/35V
0.1µ/50 V
C31
C7
R7
R8
R9
P03
P10
P11
P12
P13
D0
D1
D2
16
15
14
13
12
11
10
932
31
30
29
28
27
26
25
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
P02
P01
P00
AIN3
AIN2
AIN1
AIN0
INT1
D1D2
D3
A5
A1
A3
C61
C4
0.1µ/50V
C6
ModelChg.
AC
AC
(J1)
13
9321
144
5
67810
11
12
: IF NOT SPECIFIED 1/10W 5%
: IF NOT SPECIFIED 0.01µ/50V
: IF NOT SPECIFIED 1SS270A
CN-A3
Pin5mm
Pitch
COM
COM
120V/60Hz
N.O
OVEN LAMP
ANTENNA
MOTOR
FAN MOTOR
N.O
RY2
Q22
KRC105S
RY1
D22
D20
D30
4.7K
47K
R31
R30
C30
D21
R21
4.7K
Q20
KRC101S
4.7K
R22
C21
10µ
/35V
0.1µ
/50V
C20
R20 4.7K
Q21
KRA101S
HZ11A3 x 3
ZD3
ZD2
ZD1
1W 510 x 2
R3
1W 1K
KTC3198A
HZ6C3 x 2
ZD5
ZD4
KTA1504
R6
4.7K
HZ4C1
ZD6
4.7K
R10
D11
D100.1µ/50V
27K
Q40
KRC101S
SP1
R41
1.5K
R42
3.3K
27K27K
R40
4.7K
220µ/16V
C5
(J3)
(J5) 6.2K
(J7)
(J6) 4.7K
(J4) 4.7K
(J2) 4.7K
(JF)
4.7K
C60
4MHz
CF1
D82
D83
D84D85
R70
R71R72
R73
R74
100
150
240
330
430
LD1
_
LD20 LTL-1CHE-011A x 20
LD1
(20S)
LD2
(40S)
LD3
(1M)
LD4
( . )
LD5
(2M)
Q70
KRA101S
Q71
KRA101S
Q72
KRA101S
Q73
KRA101S
LD16
LD17
LD18
LD19
LD20
(15M)
D81
( . )
D80
( . )
D79
( . )
D78
( . )
LD11
D74 (6M)
LD12
D75 (7M)
LD13
D76 (8M)
LD14
D77 (9M)
LD15
(10M)
LD10
(5M)
LD9
(4M)
LD8
( . )
LD7
(3M)
LD6
( . )
I-1
IXA167DR
R63 4.7K
R62 4.7K
SW1
R61
10K
R60
10K
R50
10K
1N4005E x 4
2.2µ/160VAC
C1
R12
1/2W 100K
2W 100
R11
10G471K
VRS1
VR
VC
1
2
3
45
A
B
C
D
E
F
6
A
B
C
D
E
Figure S-2. Control Panel Circuit
F
G
H
1
2
G
H
3
45
6
28
R-21JCA-F
1
2
3
45
A
B
LD4
JP32
9
JP35
LD20
8
D72
JP34
JP31
JP27
LD3
LD2
LD1
C
D81
D77
D73
JP29
D84
D85
JP25
D
JP24
10
13
14
11
12
D83
LD5
LD19
D71
A
JP26
LD6
JP39
JP36
SW1
BC
D82
LD18
JP28
7
LD7
LD8
D76
D80
D79
D75
JP33
JP30
D70
LD16
LD17
6
12345
D74
LD9
D78
LD15
JP23
JP38
LD10
LD14
JP37
LD11
LD12
LD13
6
A
B
C
D
E
F
G
JP19
12
CNC
EB
Q1
JP8
D20
JP13
C21
RY1
JP14
ZD5
ZD4
R3
D10
D11
JP1
JP12
32
1
JP18
JP17
24
JP3
JP2
17
VRS1
8
9
16
CF1
JP6
R12
C1
R11
5
CNA
JP11
JP10
JP9
JP7
ZD1
ZD2
ZD3
D21
RY2
J1
JP20
JP21
SP1
JP4
R2
R1
D1
D3
D4
D2
1
D22
ZD6
JP16
JP15
JP5
D30
JP22
C5
C3
ICP1
1
2
WHA
1
2
WHA
SW2
H
E
F
G
H
Figure S-3. Printed Wiring Board
1
2
3
45
6
29
R-21JCA-F
PARTS LIST
Note: The parts marked “∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V.
3- 1DPWBFC288WRUZControl unit assembly1BF
3- 2FPNLCB434WRK0Panel sub assembly1BA
3- 2-1HPNLTA137WRE0Timer sheet1AH
3- 2-2GCOVAA260WRP0C/P case1BA
3- 3TCAUAA076WRR0User caution label1AB
3- 4JKNBKA606WRM0Timer knob1AL
3- 5XEPS730P08XS0Screw; 3mm X 8mm5AB
4- 1FGLSPA062WRE0Ceramic shelf1BL
4- 2*************Oven cavity (Not a replaceable part)1—
∆
4- 3MLEVPA227WRF0Latch switch lever A1AF
4- 4MLEVPA228WRF0Latch switch lever B1AF
4- 5MLEVPA229WRF0Latch switch lever C1AF
4- 6MSPRCA108WRE0Latch lever spring3AC
4- 7MSPRTA191WRE0Switch lever B spring1AC
4- 8PHOK-A121WRFZLatch hook1AG
7- 1XHPS740P08K00Screw : 4mm x 8mm8AB
7- 2XEPS740P25000Screw : 4mm x 25mm2AB
7- 3LX-CZA038WRE0Special screw4AA
7- 4LX-CZ0052WRE0Special screw2AA
7- 5LX-EZA042WRE0Special screw2AB
7- 6XBPWW40P04000Screw : 4mm x 4mm1AB
7- 7XFPS740P08000Screw : 4mm x 8mm3AB
7- 8XFTS740P08000Screw : 4mm x 8mm2AB
7- 9XHPS730P06000Screw : 3mm x 6mm1AB
7-10XHTS740P08RV0Screw : 4mm x 8mm1AG
7-11XOTS740P12000Screw : 4mm x 12mm12AA
7-12XOTS840P08000Screw : 4mm x 8mm1AB
7-13XOTWW40P10000Screw : 4mm x 10mm4AA
R-21JCA-F
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER2. REF. NO.3. PART NO.4. DESCRIPTION
Order Parts from the authorized SHARP parts Distributor for your area.
Defective parts requiring return should be returned as indicated in the Service Policy.
31
R-21JCA-F
1
A
2-1
2
7-3
3
OVEN AND CABINET PARTS
7-3
7-3
45
6
A
1-10
1-9
4-28
7-13
B
7-3
4-9
6-6
B
4-10
6-8
7-6
4-34
C
4-27
4-24
4-26
7-12
4-25
1-13
7-1
1-4
6-5
4-26
6-4
4-14
4-19
4-2
4-36
4-16
4-32
4-15
7-13
6-3
7-9
1-4
1-1
7-7
4-15
7-10
7-13
C
7-1
1-8
4-40
7-8
7-11
4-24
1-12
D
4-18
D
4-23
4-21
4-20
7-4
7-4
7-7
4-6
7-7
4-33
4-6
1-3
4-3
4-4
4-5
1-1
4-7
7-1
4-11
7-1
1-15
1-6
4-12
1-14
7-1
1-5
4-13
4-39
7-5
1-7
4-35
7-2
E
F
G
4-21
E
4-22
4-21
4-20
6-10
4-29
1-11
7-1
F
4-1
4-38
4-20
4-30
2-2
4-31
4-8
1-2
4-37
4-20
G
4-41
7-11
2-4
4-17
7-11
4-24
x2
2-5
H
2-4
H
2-3
7-8
1
2
3
45
7-11
6
32
R-21JCA-F
1
CONTROL PANEL PARTS
A
B
3-3
C
D
3-2-2
3-2
2
3
45
6
3-1
3-2-1
3-4
3-5
3-5
DOOR PARTS
5-2
A
B
C
5-1-15
5-1-16
5-1
5-1-14
5-1-12
5-1-2
5-1-16
D
5-1-18
5-1-4-2
E
5-1-4
5-1-4-3
5-1-4-4
5-1-4-5
x4
5-1-4-1
5-1-13
5-1-16
5-1-1
E
5-1-4-5
x2
5-1-12
5-1-16
5-1-8
F
5-1-9
5-3
5-1-7
5-1-17
5-1-11
F
5-1-3
5-1-5
5-1-8
G
5-1-6
5-1-10
5-1-17
MISCELLANEOUS
6-2
G
6-9
Actual wire harness may be different from illustration.
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.
PACKING CASE
SPAKCD803WREZ
ALL RIGHTS RESERVED.
34
'05 SHARP CORP. (10S0.80E) Printed in U.S.A
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