Sharp Microwave Oven R 21JCA F User Manual
R-21JCA-F  
SERVICE MANUAL  
S0514R21JCPAF  
LIGHT DUTY  
COMMERCIAL  
MICROWAVE OVENS  
MODEL  
R-21JCA-F  
1000W/ R-21JCA  
TIME GUIDE  
F
OR ONE SERVIN  
G
15 30 sec.  
-
30 60 sec.  
-
Bagel, Roll  
Muffin, Pastry  
Pie Slice  
Hot Dog  
Pizza Slice  
Small Sandwic  
h
1
-
2
min.  
2
-
3
min.  
Beverage, Soup  
Large Sandwich  
Popcorn, 1.5 oz.  
Casserole,  
Chili, Chowd  
Popcorn, 3.5 oz.  
S
tew  
er  
50  
40  
1
E
F
1.5  
G
30  
D
H
I
C
20  
B
2
10  
J
A
K
0
L
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.  
2.5  
N 3  
M
O
P
R
Q
6
4
5
INSTRUCT  
IONS  
With the  
d
oor closed  
,turn the  
the desire  
tim  
er to  
d
tim  
e.  
O
ve  
n
w
ill  
b
egin  
ope  
rating  
im  
mediate  
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..)  
ly.  
To shut  
to "0".  
o
ven off  
m
anua  
lly,return tim  
er  
TABLE OF CONTENTS  
Page  
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO  
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ...................INSIDE FRONT COVER  
BEFORE SERVICING ......................................................................................................INSIDE FRONT COVER  
WARNING TO SERVICE PERSONNEL................................................................................................................ 1  
MICROWAVE MEASUREMENT PROCEDURE ................................................................................................... 2  
FOREWORD AND WARNING............................................................................................................................... 3  
PRODUCT SPECIFICATIONS .............................................................................................................................. 4  
GENERAL INFORMATION................................................................................................................................... 4  
OPERATION ..........................................................................................................................................................6  
TROUBLESHOOTING GUIDE .............................................................................................................................. 9  
TEST PROCEDURE ............................................................................................................................................ 10  
TOUCH CONTROL PANEL ................................................................................................................................. 16  
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................ 20  
PICTORIAL DIAGRAM ........................................................................................................................................ 27  
CONTROL PANEL CIRCUIT .............................................................................................................................. 28  
PRINTED WIRING BOARD ................................................................................................................................. 29  
PARTS LIST ........................................................................................................................................................ 30  
PACKING AND ACCESSORIES ......................................................................................................................... 34  
This document has been published to be used for after  
sales service only.  
The contents are subject to change without notice.  
SHARP CORPORATION  
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R-21JCA-F  
WARNING TO SERVICE PERSONNEL  
Microwave ovens contain circuitry capable of pro-  
ducing very high voltage and current, contact with  
following parts may result in a severe, possibly  
fatal, electrical shock.  
(Example)  
High Voltage Capacitor, High Voltage Power Trans-  
former, Magnetron, High Voltage Rectifier Assem-  
bly, High Voltage Harness etc..  
Read the Service Manual carefully and follow all  
instructions.  
Don't Touch !  
Danger High Voltage  
1. Disconnect the power supply cord, and then remove outer  
case.  
Before Servicing  
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.  
1. Disconnect the power supply cord ,  
remove outer case.  
2. Open the door and block it open.  
3. Discharge high voltage capacitor.  
and then  
7. Run the oven and check all functions.  
WARNING:RISK OF ELECTRIC SHOCK.  
DISCHARGE THE HIGH-VOLTAGE  
CAPACITOR BEFORE SERVICING.  
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.  
The high-voltage capacitor remains charged about 60 sec-  
onds after the oven has been switched off. Wait for 60  
seconds and then short-circuit the connection of the high-  
voltage capacitor (that is the connecting lead of the high-  
voltage rectifier) against the chassis with the use of an  
insulated screwdriver.  
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 connec-  
tions to the component being tested.  
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.  
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.  
6. After that procedure, reconnect the power supply cord.  
When the testing is completed,  
1
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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.  
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
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R-21JCA-F  
SERVICE MANUAL  
PRODUCT DESCRIPTION  
GENERAL INFORMATION  
OPERATION  
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.  
TROUBLESHOOTING GUIDE AND  
TEST PROCEDURE  
Check the interlock switches and the door seal carefully. Special attention  
should be given to avoid electrical shock and microwave radiation hazard.  
TOUCH CONTROL PANEL  
WARNING  
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.  
COMPONENT REPLACEMENT  
AND ADJUSTMENT PROCEDURE  
(D) The door is not deformed or warped.  
(E) There is no other visible damage with the oven.  
WIRING DIAGRAM  
PARTS LIST  
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 person-  
nel - 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
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R-21JCA-F  
SPECIFICATION  
ITEM  
DESCRIPTION  
Power Requirements  
120 Volts  
14 Amperes  
60 Hertz / Single phase, 3 wire grounded  
Power Output  
1000 watts (IEC 705 Test Procedure)  
Operating frequency of 2450MHz  
Case Dimensions  
Width 20-1/2" (520mm)  
Height 12-1/8"(309mm)  
Depth 16"  
(406mm)  
NOTE: Internal capacity is calculated by measuring  
maximum width, depth and height.  
Cooking Cavity Dimensions  
(1.0 Cubic Feet )  
Width 13-7/8" (353mm)  
Height 8-1/8" (207mm)  
Depth 14-5/8"(370mm)  
Actual capacity for holding food is less.  
Control Complement  
Light Up Dial (6 minutes)  
No cooking control  
Yes  
Oven Cavity Light  
Safety Standard  
UL Listed  
FCC Authorized  
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J, NSF Certified  
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,  
Grounded  
Receptacle Box  
3-Pronged Plug  
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.  
Grounding Pin  
3-Pronged Receptacle  
CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE ROUND GROUNDING PRONG FROM THIS  
PLUG.  
4
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R-21JCA-F  
OVEN DIAGRAM  
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  
12  
9
1
4
3
2
14  
13  
11  
9. Door hinges  
10.Door seals and sealing surfaces  
11.Door handle  
12.Oven door with see-through  
window  
15  
16  
5
8
10  
6
7
13.Air ventilation cover and openings  
14.Power supply cord  
15.Air intake openings  
16.Outer case cabinet  
CONTROL PANEL  
TIME GUIDE FOR ONE SERVING  
15 - 30 sec.  
Bagel, Roll  
Muffin, Pastry  
Pie Slice  
30 - 60 sec.  
Hot Dog  
Pizza Slice  
Small Sandwich  
1 - 2 min.  
2 - 3 min.  
Beverage, Soup  
Large Sandwich  
Popcorn, 1.5 oz.  
Casserole, Stew  
Chili, Chowder  
Popcorn, 3.5 oz.  
1
50  
40  
1.5  
G
F
E
30  
D
H
I
C
20  
2
K
B
J
10  
A
Light Up Dial for setting cooking time.  
L
2.5  
0
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O
P
T
S
Q
R
4
6
5
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".  
5
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R-21JCA-F  
OPERATION  
DESCRIPTION OF OPERATING SEQUENCE  
The following is a description of component functions during  
oven operation.  
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.  
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.  
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  
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.  
(1) When the door opens from the closed position, the primary  
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.  
Ifthe 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.  
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)  
RELAY  
RY-1  
CONNECTED COMPONENTS  
Oven lamp/ Antenna motor/ Fan motor  
Power transformer  
RY-2  
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.  
6
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R-21JCA-F  
SCHEMATIC  
NOTE: CONDITION OF OVEN  
1. LIGHT UP DIAL OFF.  
2. DOOR CLOSED.  
NOTE:  
Indicates components with potential above 250 V.  
THERMAL  
CUT-OUT  
THERMAL  
CUT-OUT  
NOISE FILTER  
125˚C (OVEN)  
145˚C (MAG.)  
POWER  
TRANSFORMER  
A5  
AC120V  
60 Hz  
CAPACITOR  
0.94 µF  
2400V  
CONTROL UNIT  
A3  
A1  
OL  
FM  
AM  
DOOR SENSING  
SWITCH  
OVEN  
LAMP  
FAN  
MOTOR  
ANTENNA  
MOTOR  
SECONDARY  
INTERLOCK SWITCH  
Figure O-1 Oven Schematic-OFF Condition  
SCHEMATIC  
NOTE: CONDITION OF OVEN  
1. DOOR CLOSED.  
2. LIGHT UP DIAL ON.  
THERMAL  
CUT-OUT  
THERMAL  
CUT-OUT  
NOISE FILTER  
125˚C (OVEN)  
145˚C (MAG.)  
POWER  
TRANSFORMER  
A5  
AC120V  
60 Hz  
CAPACITOR  
0.94 µF  
2400V  
CONTROL UNIT  
A3  
A1  
OL  
FM  
AM  
DOOR SENSING  
SWITCH  
OVEN  
LAMP  
FAN  
MOTOR  
ANTENNA  
MOTOR  
SECONDARY  
INTERLOCK SWITCH  
Figure O-2 Oven Schematic-Microwave cooking Condition  
7
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R-21JCA-F  
DESCRIPTION AND FUNCTION OF COMPONENTS  
DOOR OPEN MECHANISM  
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.  
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”).  
Latch Head  
Handle  
Lever  
NOTE: MONITOR FUSE AND MONITOR SWITCH ARE  
REPLACED AS AN ASSEMBLY.  
Latch Hook  
Door  
Latch Switch  
Lever A  
ANTENNA MOTOR  
Handle  
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.  
Secondary  
Interlock  
Switch  
Latch  
Lever  
Latch Switch  
Lever B  
Monitor  
Switch  
Latch Head  
COOLING FAN MOTOR  
The cooling fan motor drives a blade which draws external  
cool air. This cool air is directed through the air vanes sur-  
rounding 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.  
Latch Switch  
Lever C  
Door  
Sensing  
Switch  
Figure D-1. Door Open Mechanism  
DOOR SENSING AND SECONDARY INTERLOCK  
SWITCHES  
The secondary interlock switch is mounted in the upper posi-  
tion 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 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 short-  
circuited, 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 over-  
heating. If the temperature goes up higher than 293˚F (145˚C)  
because the fan motor is interrupted or the ventilation open-  
ings 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 cut-  
out will not resume.  
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.  
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.  
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)  
NOISE FILTER  
The noise filter prevents the radio frequency interference that  
might flow back in the power circuit.  
8
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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.  
TEST PROCEDURE  
A
B
C
D
E
F
F
G
H
I
J
K
L
RE RE RE RE RE CK CK CK  
POSSIBLE CASE  
AND  
DEFECTIVE PARTS  
CONDITION  
PROBLEM  
Home fuse or circuit breaker blows when  
power cord is plugged into wall outlet.  
OFF  
CONDITION  
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.)  
COOKING  
CONDITION  
Oven goes into  
a
cook cycle but  
extremely uneven heating is produced in  
oven load (food).  
9
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R-21JCA-F  
TEST PROCEDURES  
COMPONENT TEST  
PROCEDURE  
LETTER  
A
MAGNETRON ASSEMBLY TEST  
1. Disconnect the power supply cord, and then remove outer case.  
2. Open the door and block it open.  
3. Discharge high voltage capacitor.  
4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across  
the magnetron filament leads should indicate less than 1 ohm.  
5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads and  
chassis ground. This test should indicate an infinite resistance. If there is little or no resistance the  
magnetron is grounded and must be replaced.  
6. Reconnect all leads removed from components during testing.  
7. Reinstall the outer case (cabinet).  
8. Reconnect the power supply cord after the outer case is installed.  
9. Run the oven and check all functions.  
MICROWAVE OUTPUT POWER  
The following test procedure should be carried out with the microwave oven in a fully assembled condition  
(outer case fitted).  
HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULD BE  
OBSERVED.  
Power output of the magnetron can be measured by performing a water temperature rise test. This test 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.  
B
POWER TRANSFORMER TEST  
1. Disconnect the power supply cord, and then remove outer case.  
2. Open the door and block it open.  
3. Discharge high voltage capacitor.  
4. Disconnect the primary input terminals and measure the resistance of the transformer with an ohmmeter.  
Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of the primary coil  
should be less than 1 ohm and the resistance of the high voltage coil should be approximately 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  
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R-21JCA-F  
TEST PROCEDURES  
COMPONENT TEST  
PROCEDURE  
LETTER  
C
HIGH VOLTAGE RECTIFIER TEST  
1. Disconnect the power supply cord, and then remove outer case.  
2. Open the door and block it open.  
3. Discharge high voltage capacitor.  
4. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistance across  
the terminals and observe, reverse the leads to the rectifier terminals and observe meter reading. If a short  
is indicated in both directions, or if an infinite resistance is read in both directions, the rectifier is probably  
defective and should be replaced.  
5. Reconnect all leads removed from components during testing.  
6. Reinstall the outer case (cabinet).  
7. Reconnect the power supply cord after the outer case is installed.  
8. Run the oven and check all functions.  
NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volts.  
D
HIGH VOLTAGE CAPACITOR TEST  
1. Disconnect the power supply cord, and then remove outer case.  
2. Open the door and block it open.  
3. Discharge high voltage capacitor.  
4. If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and  
check for 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.  
E
THERMAL 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 cut-  
out 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  
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R-21JCA-F  
TEST PROCEDURES  
PROCEDURE  
COMPONENT TEST  
SECONDARY INTERLOCK SWITCH TEST  
LETTER  
F
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.  
G
MONITOR SWITCH TEST  
1. Disconnect the power supply cord, and then remove outer case.  
2. Open the door and block it open.  
3. Discharge high voltage capacitor.  
4. Before performing this test, make sure that the secondary interlock switch and the primary interlock 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.  
MONITOR  
SWITCH  
5. Reconnect all leads removed from  
SCREW  
DRIVER  
components during testing.  
6. Reinstall the outer case (cabinet).  
7. Reconnect the power supply cord after the  
WHT/ WHT  
outer case is installed.  
8. Run the oven and check all functions.  
OHMMETER  
12  
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R-21JCA-F  
TEST PROCEDURES  
COMPONENT TEST  
PROCEDURE  
LETTER  
H
BLOWN MONITOR FUSE TEST  
1. Disconnect the power supply cord, and then remove outer case.  
2. Open the door and block it open.  
3. Discharge high voltage capacitor.  
4. If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary interlock  
switch and monitor switch according to the "TEST PROCEDURE" for those switches before replacing the  
blown monitor fuse.  
CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCK  
RELAY, 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.  
I
NOISE 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.  
N
L
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.  
FUSE  
20A  
LINE CROSS CAPACITOR 0.22 F AC250V  
NOISE SUPPRESSION COIL  
5. Reconnect all leads removed from components during  
testing.  
6. Reinstall the outer case (cabinet).  
LINE BYPASS  
CAPACITOR  
0.003300 F / AC 125V  
LINE BYPASS  
CAPACITOR  
0.003300 F / AC 125V  
7. Reconnect the power supply cord after the outer case is  
installed.  
WHITE  
RED  
8. Run the oven and check all functions.  
MEASURING POINT  
Between N and L  
INDICATION OF OHMMETER  
Open circuit  
Between terminal N and WHITE  
Between terminal L and RED  
Short circuit  
Short circuit  
J
CONTROL 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.  
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  
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R-21JCA-F  
TEST PROCEDURES  
COMPONENT TEST  
PROCEDURE  
LETTER  
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.  
K
RELAY TEST  
1. Disconnect the power supply cord and then remove outer case.  
2. Open the door and block it open.  
3. Discharge high voltage capacitor.  
4. Disconnect the leads to the primary of the power transformer.  
5. Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.  
6. After that procedure, re-connect the power supply cord.  
7. Remove the outer case and check voltage between Pin No. 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  
good, control unit is defective.  
RELAY SYMBOL  
OPERATIONAL VOLTAGE  
Approx. 19.2V D.C.  
CONNECTED COMPONENTS  
Oven lamp / Antenna motor / Cooling fan motor  
Power transformer  
RY1  
RY2  
Approx. 19.9V D.C.  
The voltage under the condition when all LEDs light up.  
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.  
14  
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R-21JCA-F  
TEST PROCEDURES  
PROCEDURE  
LETTER  
COMPONENT TEST  
FOIL PATTERN ON THE PRINTED WIRING BOARD TEST  
L
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.  
STEPS  
OCCURRENCE  
Only pattern at "a" is broken.  
Pattern at "a" and "b" are broken.  
CAUSE OR CORRECTION  
*Insert jumper wire J1 and solder.  
1
2
*Insert the coil RCILF2003YAZZ between "c" and "d".  
5) Make a visual inspection of the varistor.  
Check for burned damage.  
5
a
VRS1  
CNA  
d
c
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.  
STEPS  
OCCURRENCE  
CAUSE OR CORRECTION  
The rated AC voltage is not present between  
Pin No. 5 of the 3-pin connector (A) and the  
common terminal of the relay RY1.  
1
Check supply voltage and oven power cord.  
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  
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R-21JCA-F  
TOUCH CONTROL PANEL ASSEMBLY  
OUTLINE OF TOUCH CONTROL PANEL  
Control Unit  
4) Reset Circuit  
Control unit consists of LSI, power source circuit, synchroniz-  
ing signal circuit, reset circuit, buzzer circuit, encoder circuit  
and indicator circuit.  
A circuit to generate a signals which resets the LSI to the  
initial state when power is supplied.  
5) Buzzer Circuit  
1) LSI  
The buzzer is responsive to signals from the LSI to emit  
audible sounds (completion sound).  
This LSI controls the encoder signal, relay driving signal for  
oven function, buzzer signal and LED signal.  
6) Door Sensing Switch  
2) Power Source Circuit  
A switch to “tell” the LSI if the door is open or closed.  
This circuit generates voltage necessary in the control unit.  
7) Relay Circuit  
Symbol  
VC  
Voltage  
+5V (*)  
Application  
To drive the magnetron, fan motor, antenna motor and light  
the oven lamp.  
LSI(I-1)  
VR  
+20V (*)  
RELAY(RY1, RY2)  
8) Encoder  
The encoder generates the pulse signal, and the pulse  
signal is sent to the LSI.  
(*) 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.  
9) Indicator Circuit  
Indicator elements are the Light-emitting diodes (LD1-  
LD20).  
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.  
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.  
Signal  
I/O  
Description  
1
D3  
OUT  
Segment data signal.  
Signal is input to the cathodes of the light-emitting diodes (LD1, LD6, LD11 and LD16).  
2
3
4
5
D4  
D5  
D6  
D7  
OUT  
OUT  
OUT  
OUT  
Digit selection signal.  
Signal is input to the anodes of the light-emitting diodes (LD16 - LD20).  
Digit selection signal.  
Signal is input to the anodes of the light-emitting diodes (LD11 - LD15).  
Digit selection signal.  
Signal is input to the anodes of the light-emitting diodes (LD6 - LD10).  
Digit selection signal.  
Signal is input to the anodes of the light-emitting diodes (LD1 - LD5).  
6
7
8
P20  
P21  
P22  
IN  
IN  
IN  
Connected to VDD terminal.  
Connected to VSS terminal.  
Signal coming from encoder.  
When the encoder is turned, the contacts of encoder make pulse signals. And pulse  
signals are input into P22.  
16  
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R-21JCA-F  
Pin No.  
Signal  
I/O  
Description  
9
IN  
Auto clear terminal.  
RESET  
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.  
10  
11  
12  
CNVSS  
XOUT  
XIN  
IN  
OUT  
IN  
Power source voltage.  
The power source voltage to drive the LSI is input to CNVSS terminal.  
Internal clock oscillation frequency control output.  
Output to control oscillation input of XIN.  
Internal clock oscillation frequency input setting.  
The internal clock frequency is set by inserting the ceramic filter oscillation circuit with  
respect to XOUT terminal.  
13  
14  
VSS  
VDD  
IN  
IN  
Power source voltage: 0V.  
The power source voltage to drive the LSI is input to VSS terminal. Connected to VC.  
Power source voltage: +5V.  
The power source voltage to drive the LSI is input to VDD terminal.  
15  
16  
N.F  
IN  
IN  
Connected to VSS terminal.  
INT0  
Signal coming from encoder.  
Signal similar to P22. Pulse signals are input into INT0.  
17  
INT1  
IN  
Signal to synchronize LSI with commercial power source frequency.  
This is basic timing for all real time processing  
H : +5V  
of LSI.  
L: 0V  
16.7 msec  
18  
AIN0  
IN  
IN  
Input signal which communicates the door open/close information to LSI.  
Door closed; "L" level signal.  
Door opened; "H" level signal.  
19-21  
AIN1-AIN3  
Terminal to change functions according to the model.  
Signal in accordance with the model in operation is applied to set up its function.  
22  
23  
P00  
P01  
OUT  
OUT  
Terminal not used.  
Magnetron 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.  
24  
P02  
OUT  
Oven lamp, turntable motor and fan motor driving signal(Square Waveform :  
16.7 msec  
60Hz).  
H
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.  
L
During cooking  
2.0 sec  
25  
P03  
OUT  
Signal to sound buzzer.  
H: +5V  
Completion sound.  
L: 0V  
26  
P10  
OUT  
OUT  
Terminal not used.  
27-29  
P11-P13  
Segment data signal.  
Signal is input to the cathodes of the light-emitting diodes (LD5, LD10, LD15 and LD20).  
30  
31  
32  
D0  
D1  
D2  
OUT  
OUT  
OUT  
Segment data signal.  
Signal is input to the cathodes of the light-emitting diodes (LD4, LD9, LD14 and LD19).  
Segment data signal.  
Signal is input to the cathodes of the light-emitting diodes (LD3, LD8, LD13 and LD18).  
Segment data signal.  
Signal is input to the cathodes of the light-emitting diodes (LD2, LD7, LD12 and LD17).  
17  
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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.  
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 sensor-  
related 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.  
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.  
(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).  
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.  
3. Servicing Tools  
Tools required to service the touch control panel assembly.  
(1) Servicing the touch control panel with power supply of  
the oven :  
1) Soldering iron: 60W  
(It is recommended to use a soldering iron with a  
grounding terminal.)  
CAUTION:  
2) Oscilloscope: Single beam, frequency range: DC -  
10MHz type or more advanced model.  
3) Others: Hand tools  
THE HIGH VOLTAGE TRANSFORMER OF THE MICRO-  
WAVE OVEN IS STILL LIVE DURING SERVICING AND  
PRESENTS A HAZARD .  
Therefore, before checking the performance of the touch  
control panel,  
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.  
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  
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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.  
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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..  
Avoid possible exposure to microwave energy. Please follow the instructions below before  
operating the oven.  
WARNING:  
1. Disconnect the power supply cord.  
2. Visually check the door and cavity face plate for damage  
(dents, cracks, signs of arcing etc.).  
5. There are defective parts in the door interlock system.  
6. There are defective parts in the microwave generating  
and transmission assembly.  
7. There is visible damage to the oven.  
Carry out any remedial work that is necessary before operat-  
ing the oven.  
Do not operate 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.  
1. Without the RF gasket (Magnetron).  
2. If the wave guide or oven cavity are not intact.  
3. If the door is not closed.  
4. If the outer case (cabinet) is not fitted.  
WARNING FOR WIRING  
To prevent an electric shock, take the following precau-  
tions.  
1. Before wiring,  
3) Sharp edge:  
Bottom plate, Oven cavity, Waveguide flange, Chassis  
support and other metallic plate.  
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:  
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.  
Oven lamp, Magnetron, High voltage transformer, and  
Oven cavity.  
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 CAPACI-  
TOR BEFORE TOUCHING ANY OVEN COM-  
PONENTS OR WIRING.  
POWER TRANSFORMER REMOVAL  
1. Disconnect the power supply cord and then remove outer  
case.  
6. Disconnect the main wire harness from the power  
transformer.  
2. Open the oven door and block it open.  
3. Discharge high voltage capacitor.  
7. Remove the two (2) screws and two (2) VCP caps holding  
the transformer to base plate.  
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.  
8. Remove the transformer.  
9. Now the power transformer is free.  
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HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE CAPACITOR REMOVAL  
To remove the components, proceed as follows.  
1. Disconnect the power supply cord and then remove outer  
case.  
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.  
2. Open the door and block it open.  
3. Discharge high voltage capacitor.  
11.Release the capacitor holder from the fan duct.  
12.Remove the capacitor from the capacitor holder.  
13.Now, the capacitor should be free.  
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.  
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-  
FIER AND HIGH VOLTAGE CAPACITOR,  
GROUND SIDE TERMINAL OF THE HIGH VOLT-  
AGE RECTIFIER MUST BE SECURED FIRMLY  
WITH A GROUNDING SCREW.  
MAGNETRON REMOVAL  
1. Disconnect the power supply cord and then remove outer  
case.  
8. Release the tabs of air intake duct from the chassis support  
and the oven cavity.  
2. Open the door and block it open.  
9. Move the air intake duct to the left.  
3. Discharge high voltage capacitor.  
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.  
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.  
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  
TIMER KNOB  
CONTROL PANEL ASSEMBLY  
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.  
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.  
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.  
CONTROL UNIT  
8. Remove the five (5) screws holding the control unit to the  
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.  
9. Remove the control unit from the control panel frame.  
10.Now, the control unit is free.  
OVEN LAMP AND LAMP SOCKET REMOVAL  
Oven lamp  
socket  
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.  
Terminal  
Wire lead  
Terminal hole  
Flate type small  
screw driver  
6. Now, the oven lamp socket is free.  
Figure C-1. Oven lamp socket  
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R-21JCA-F  
POSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVAL  
Terminal  
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.  
Positive lock®  
connector  
1
Push  
Lever  
CAUTION: WHEN CONNECTING THE POSITIVE LOCK®  
CONNECTORS TO THE TERMINALS, INSTALL  
THE POSITIVE LOCK® CONNECTOR SO THAT  
THE LEVER FACES YOU.  
2
Pull down  
Figure C-2. Positive lock® connector  
ANTENNA MOTOR REMOVAL  
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.  
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  
CAUTION:  
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 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.  
*
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.  
10.Hold the edge of the rotor of the fan motor by using a pair  
of groove joint pliers.  
CAUTION:  
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 hit the fan blade hard when installing because  
the bracket may be disfigured.  
Make sure that the fan blade rotates smooth after  
installation.  
*
*
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.  
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.  
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.  
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  
Shaft  
Groove joint pliers  
Center of  
bracket  
Table  
Stator  
Shaft  
Axis  
These are the positions  
that should be pinched  
with pliers  
Gap  
Bracket  
Rotor  
Stator  
Rotor  
Rear View  
Side View  
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POWER SUPPLY CORD REPLACEMENT  
Removal  
7. Now, the power supply cord is free.  
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. 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  
plate.  
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.  
Oven Cavity  
Power Supply Cord  
Rear Plate  
Moulding  
Cord Stopper  
Screw  
Green  
Power  
Supply Cord  
Wire  
Chassis  
Support  
Black Wire  
RED  
WHT  
L
Oven Cavity  
Rear Plate  
N
White Wire  
Noise Filter  
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  
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.  
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. Remove the control panel assembly referring to "CONTROL  
PANEL ASSEMBLY REMOVAL".  
Latch Hook  
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.  
Tabs  
Secondary  
Interlock  
Switch  
Tab  
Re-install  
Monitor  
Switch  
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.  
Tab  
Tab  
Door  
Sensing  
Tab  
Switch  
3. Secure latch hook (with two (2) mounting screws) to oven  
flange.  
Figure C-4. Switches  
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.  
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.  
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.  
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.  
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  
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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.)  
Latch Head  
Handle  
Lever  
Latch Hook  
Door  
Latch Switch  
Lever A  
Handle  
Secondary  
Interlock  
Switch  
Latch  
Lever  
Latch Switch  
Lever B  
Monitor  
Switch  
Latch Head  
Latch Switch  
Lever C  
Door  
Sensing  
Switch  
Figure C-5. Latch Switch Adjustments  
DOOR PARTS REMOVAL  
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.  
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.  
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)  
Choke Cover  
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.  
Putty Knife  
DOOR CASE REMOVAL  
(After DOOR PANEL REMOVAL)  
12.Straighten all tabs of the door case holding the door case to  
the door frame.  
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.  
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.  
RE-INSTALL OF THE DOOR  
DOOR PANEL REMOVAL  
9. Remove the four (4) screws holding the door panel to the  
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.  
door frame.  
10.Release door panel from seven (7) tabs of door frame by  
sliding door panel downward.  
3. Re-install choke cover to door panel by pushing.  
11.Now, the door panel is free.  
NOTE: After any service to the door;  
DOOR HANDLE REMOVAL  
12.Release the latch spring from the tab of the latch angle  
(A) Make sure that door sensing switch and secondary  
interlock switch are operating properly. (Refer to  
chapter "Test Procedures".).  
assembly.  
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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.)  
Upper  
Oven  
Hinge  
Pin  
Upper Oven  
Hinge  
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.)  
Lower  
Oven  
Hinge  
Door  
Panel  
Slit  
Chok  
Choke Cover  
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.  
Lower  
Oven  
Hinge  
Pin  
Figure C-7. Door Replacement  
ANTENNA MOTOR SHAFT REPLACEMENT  
REMOVAL  
INSTALLATION  
1. Disconnect the power supply cord.  
2. Open the door and block it open.  
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.  
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.  
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" .  
Screw  
Antenna holder  
Washer  
Square  
hole  
Stirrer antenna  
Antenna  
motor shaft  
Tab  
Oven cavity  
bottom plate  
Antenna motor  
Screw  
Figure C-8. Antenna Motor Shaft Removal  
25  
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R-21JCA-F  
Flat face  
Antenna  
motor shaft  
To left wall of  
oven cavity  
To right wall  
of oven cavity  
Flat face  
Centre  
Antenna holder  
Hole  
Stirrer antenna assembly  
Stirrer antenna  
Stirrer antenna's  
big blade  
Tab  
Antenna  
motor shaft  
Figure C-9. Derection of Antenna Motor Shaft and  
Stirrer Antenna Assembly  
Oven cavity  
bottom plate  
Antenna holder  
Antenna holder  
Stirrer antenna  
Stirrer antenna  
Tab  
Tab  
Antenna  
motor shaft  
Antenna  
motor shaft  
Oven cavity bottom plate  
Figure C-10. Stirrer Antenna Assembly Installation  
INSTALLATION OF CERAMIC SHELF  
1. Disconnect the power supply cord.  
2. Open the door and block it open.  
WARNING  
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.  
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.  
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.  
Oven Cavity  
Rear Edge  
Push  
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.  
Ceramic  
Shelf  
Front Edge  
26  
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R-21JCA-F  
6
4
5
2
1
3
W H T  
A
B
C
D
E
F
A
R E D  
L
N
R E C T I F I E R  
H . V .  
B
C
D
E
F
H O T  
N E U T R A L  
E A R T H  
G
G
R E L A Y  
I N T E R L O C K  
P R I M A R Y  
H
H
6
4
5
2
1
3
27  
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R-21JCA-F  
6
4
5
2
1
3
A
A
B
C
D
E
F
B
C
D
E
F
H Z 1 1 A 3 x 3  
H Z 6 C 3 x 2  
4 . 7 K  
( J F )  
Z D 6  
H Z 4 C 1  
1 K R 5  
C
RESET  
R 1 0  
4 . 7 K  
D 1 1  
I N T 1 7  
A I N 1 0 8  
A I N 1 9  
A I N 2 0  
A I N 2 3 1  
P 0 0 2 2  
P 0 1 2 3  
P 0 2 2 4  
8
7
6
5
4
3
2
1
P22  
P21  
P20  
D7  
D 1 0  
/ 5 0 V 0 . 1 µ  
D6  
D5  
C 7  
D4  
2 7 K  
D3  
R 9  
( J 3 )  
( J 5 ) 6 . 2 K  
( J 7 )  
( J 2 ) 4 . 7 K  
( J 4 ) 4 . 7 K  
( J 6 ) 4 . 7 K  
V 3 / 5  
1 0 0 0 µ  
C 3  
C 2  
V
/ 5 0 0 . 1 µ  
G
G
H
H
6
4
5
2
1
3
28  
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R-21JCA-F  
6
4
5
2
1
3
A
B
C
D
E
F
A
B
C
D
E
F
LD6  
LD5  
LD7  
LD4  
LD8  
D79  
LD3  
LD9  
LD2  
LD10  
D75  
SW1  
JP33  
LD1  
LD11  
LD12  
LD13  
A
B
C
JP29  
D83  
JP27  
JP28  
D84  
D85  
LD14  
JP26  
D82  
LD15  
JP24  
LD20  
LD16  
LD19  
LD17  
LD18  
JP20  
ZD6  
JP19  
32  
1
JP18  
JP17  
JP16  
JP15  
8
24  
9
17  
16  
JP13  
JP8  
CF1  
JP9  
JP7  
ZD1  
SP1  
ZD5  
C5  
ZD2  
ZD3  
ZD4  
R3  
R2  
R1  
JP1  
D10  
R12  
D11  
D21  
C3  
C1  
D20  
D1  
D3  
1
1
2
G
WHA  
WHA  
G
D30  
D4  
D2  
1
5
2
VRS1  
CNA  
D22  
J1  
SW2  
H
H
Figure S-3. Printed Wiring Board  
6
4
5
2
1
3
29  
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R-21JCA-F  
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  
ELECTRIC PARTS  
1- 1  
1- 2  
1- 3  
1- 4  
1- 5  
1- 6  
1- 7  
1- 8  
1- 9  
1-10  
1-10  
1-11  
1-12  
1-13  
1-14  
1-15  
FFS-BA015WRK0  
Monitor fuse(20A) and monitor switch(V-5220D-070) assembly  
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
AK  
AF  
AH  
AV  
AV  
AV  
AU  
AW  
AG  
AL  
AY  
AQ  
AP  
AK  
BM  
BN  
QSW-MA051WRE0 Door sensing switch  
QSW-MA135WRE0 Secondary interlock switch  
FACCDA116WREZ Power supply cord  
FH-DZA084WRK0 High voltage rectifier assembly  
RC-QZA242WRE0 High voltage capacitor  
RMOTEA376WRE0 Fan motor  
FPWBFA389WRKZ Noise filter  
QSOCLA021WRE0 Oven lamp socket  
RLMPTA086WRZZ Oven lamp  
RLMPTA072WRE0 Oven lamp (Interchangeable)  
RMOTDA233WRE0 Antenna motor  
*
*
RTHM-A080WRE0 Thermal cut-out 145 deg. (MAG)  
RTHM-A096WRE0 Thermal cut-out 125 deg. (OVEN)  
RTRN-A570WRE0 Power transformer  
RV-MZA197WRE0 Magnetron  
*
*
∆
CABINET PARTS  
2- 1  
2- 2  
2- 3  
2- 4  
2- 5  
GCABUA674WRP0 Outer case cabinet  
GDAI-A311WRW0 Base plate  
GCOVHA406WRW0 Base plate cover  
GLEGPA074WRE0 Foot  
1
1
1
2
1
AX  
AS  
AQ  
AC  
AF  
GLEGPA076WRF0 Leg  
CONTROL PANEL PARTS  
3- 1  
3- 2  
3- 2-1  
3- 2-2  
3- 3  
DPWBFC288WRUZ Control unit assembly  
FPNLCB434WRK0 Panel sub assembly  
HPNLTA137WRE0 Timer sheet  
GCOVAA260WRP0 C/P case  
TCAUAA076WRR0 User caution label  
JKNBKA606WRM0 Timer knob  
1
1
1
1
1
1
5
BF  
BA  
AH  
BA  
AB  
AL  
AB  
3- 4  
3- 5  
XEPS730P08XS0 Screw; 3mm X 8mm  
OVEN PARTS  
4- 1  
4- 2  
4- 3  
4- 4  
4- 5  
4- 6  
4- 7  
4- 8  
4- 9  
4-10  
4-11  
4-12  
4-13  
4-14  
4-15  
4-16  
4-17  
4-18  
4-19  
4-20  
4-21  
4-22  
4-23  
4-24  
4-25  
4-26  
4-27  
4-28  
4-29  
4-30  
4-31  
4-32  
4-33  
FGLSPA062WRE0 Ceramic shelf  
************* Oven cavity (Not a replaceable part)  
MLEVPA227WRF0 Latch switch lever A  
MLEVPA228WRF0 Latch switch lever B  
MLEVPA229WRF0 Latch switch lever C  
MSPRCA108WRE0 Latch lever spring  
MSPRTA191WRE0 Switch lever B spring  
PHOK-A121WRFZ Latch hook  
FDUC-A341WRY0 Steam duct sub assembly  
PSKR-A351WRP0 Steam guide  
LBNDKA136WRP0 HV capacitor holder  
NFANJA029WRE0 Fan blade  
PDUC-A697WRF0 Fan duct  
FPLT-A007WRY0 Stirrer antenna assembly  
PCUSGA504WRP0 Insertion cushion  
PSKR-A348WRW0 Insertion plate A  
GCOVHA404WRE0 VCP cap  
LANGFA199WRWZ Chassis support  
NSFTPA035WRFZ Antenna motor shaft  
PCLICA032WRE0 Hand clip 4  
1
1
1
1
1
3
1
1
1
1
1
1
1
1
2
1
2
1
1
5
4
1
1
3
1
2
1
1
1
1
1
1
1
BL  
—
∆
∆
AF  
AF  
AF  
AC  
AC  
AG  
BL  
AY  
AQ  
AK  
AM  
BB  
AB  
AN  
AG  
AH  
AQ  
AD  
AD  
AF  
AF  
AA  
AC  
AC  
AB  
AF  
AD  
AD  
AL  
AF  
AM  
PCLICA033WRE0 Hand clip 5  
PCOVPA344WRF0 Side splash cover  
PCOVPA345WRF0 Back splash cover  
PCUSGA249WRP0 Cushion  
PCUSUA511WRP0 Cushion  
PCUSUA194WRP0 Cushion  
PCUSUA514WRP0 Cushion  
PDUC-A722WRF0 Air intake duct  
PFILWA060WRP0 Lamp filter  
PSHEPA644WRE0 Insertion sheet  
PSKR-A347WRW0 Insertion plate B  
PSKR-A349WRP0 Steam duct barrier  
PSKR-A359WRW0 Air guide  
30  
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R-21JCA-F  
REF. NO.  
PART NO.  
DESCRIPTION  
Q'TY  
CODE  
4-34  
4-35  
4-36  
4-37  
4-38  
4-39  
4-40  
4-41  
PSPA-A112WRE0 Mica washer  
PCUSGA378WRP0 Cushion  
PCUSUA507WRP0 Cushion  
PCUSUA517WRP0 Cushion  
PSHEPA674WRE0 Cover  
PPACGA171WRE0 Cushion  
PSHEPA673WRE0 S/Film  
PCUSUA518WRP0 Cushion  
1
1
1
1
1
1
1
1
AC  
AL  
AC  
AE  
AL  
AK  
AD  
AC  
DOOR PARTS  
∆ 5- 1  
CDORFA804WRK0 Door assembly  
1
1
1
1
1
1
1
1
1
6
1
1
1
2
1
1
1
2
1
1
1
4
2
1
1
1
BP  
AZ  
AB  
AW  
BQ  
AK  
AN  
AU  
BB  
AB  
AQ  
AN  
AR  
AL  
AD  
AC  
AA  
AK  
AK  
AK  
AC  
AB  
AC  
AC  
AM  
AL  
∆ 5-1-1  
5-1-2  
FDORFA322WRT0 Door panel assembly  
PSHEPA649WRE0 Sealer film  
FANGKA206WRY0 Latch angle assembly  
FCOV-A002WRK0 Door case assembly  
LSTPPA180WRF0 Glass stopper R  
LSTPPA182WRF0 Glass stopper U  
PGLSPA516WRE0 Front door glass  
PSLDMA198WREZ Sealer plate  
XCPS740P08000 Screw : 4mm x 8mm  
GWAKPA580WRM0 Door handle  
JHNDMA040WRW0 Handle lever  
LANGKA874WRW0 Latch lever  
LSTPPA181WRF0 Latch head  
MSPRTA190WRE0 Latch spring  
PCUSUA506WRP0 Cushion  
XEPS740P06000 Screw : 4mm x 6mm  
PSHEPA686WRE0 Panel sheet  
PSHEPA687WRE0 Panel sheet  
PCUSGA514WRP0 Cushion  
∆ 5-1-3  
5-1-4  
5-1-4-1  
∆
5-1-4-2  
5-1-4-3  
5-1-4-4  
5-1-4-5  
5-1-5  
5-1-6  
5-1-7  
5-1-8  
5-1-9  
∆
∆
5-1-10  
5-1-11  
5-1-12  
5-1-13  
5-1-14  
5-1-15  
5-1-16  
5-1-17  
5-1-18  
5- 2  
PCUSUA505WRP0 Cushion  
XEBS738P08000 Screw : 3.8mm x 8mm  
XEPS740P25K00 Screw : 4mm x 25mm  
PCUSUA508WRP0 Cushion  
GCOVHA407WRF0 Choke cover  
HBDGCA107WREZ Door badge  
∆
5- 3  
MISCELLANEOUS  
6- 1  
6- 1  
6- 3  
6- 4  
6- 5  
6- 6  
6- 7  
6- 8  
6- 9  
6-10  
TINSEA954WRRZ Instruction book  
FW-VZC073WREZ Main wire harness  
TCAUAA166WRR0 DHHS caution label  
TCAUAA295WRRZ Monitor caution  
TCAUAA243WRR0 Earth caution  
TCAUAA245WRR0 Cover caution  
TLABMA572WRR0 Menu sticker  
TMAPCA776WRRZ Schematic diagram  
LHLDWA013WRE0 Purse lock LL  
TCAUAA249WRR0 Caution label  
1
1
1
1
1
1
1
1
1
1
AM  
AX  
AB  
AH  
AC  
AC  
AE  
AH  
AC  
AE  
SCREWS,NUTS AND WASHERS  
7- 1  
7- 2  
7- 3  
7- 4  
7- 5  
7- 6  
7- 7  
7- 8  
7- 9  
7-10  
7-11  
7-12  
7-13  
XHPS740P08K00 Screw : 4mm x 8mm  
XEPS740P25000 Screw : 4mm x 25mm  
LX-CZA038WRE0 Special screw  
LX-CZ0052WRE0 Special screw  
LX-EZA042WRE0 Special screw  
XBPWW40P04000 Screw : 4mm x 4mm  
XFPS740P08000 Screw : 4mm x 8mm  
XFTS740P08000 Screw : 4mm x 8mm  
XHPS730P06000 Screw : 3mm x 6mm  
XHTS740P08RV0 Screw : 4mm x 8mm  
XOTS740P12000 Screw : 4mm x 12mm  
XOTS840P08000 Screw : 4mm x 8mm  
XOTWW40P10000 Screw : 4mm x 10mm  
8
2
4
2
2
1
3
2
1
AB  
AB  
AA  
AA  
AB  
AB  
AB  
AB  
AB  
AG  
AA  
AB  
AA  
1
12  
1
4
HOW TO ORDER REPLACEMENT PARTS  
To have your order filled promptly and correctly, please furnish the following information.  
1. MODEL NUMBER 2. REF. NO. 3. PART NO. 4. DESCRIPTION  
Order Parts from the authorized SHARP parts Distributor for your area.  
Defective parts requiring return should be returned as indicated in the Service Policy.  
31  
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R-21JCA-F  
6
4
5
2
1
3
7-3  
OVEN AND CABINET PARTS  
7-3  
2-1  
A
A
B
C
D
E
F
7-3  
1-10  
1-9  
4-28  
7-13  
7-3  
6-6  
4-9  
B
C
D
4-10  
7-13  
6-8  
7-6  
7-13  
4-25  
7-1  
7-12  
4-32  
4-15  
1-4  
6-5  
1-13  
4-26  
4-34  
4-26  
6-3  
1-4  
4-24  
6-4  
1-1  
4-27  
4-14  
7-1  
7-7  
4-19  
4-2  
1-8  
4-15  
7-10  
4-36  
4-16  
7-9  
4-40  
7-11  
1-12  
4-23  
4-18  
4-24  
4-21  
4-20  
7-8  
7-7  
4-21  
4-21  
7-2  
4-22  
4-20  
6-10  
4-13  
7-4  
1-7  
E
4-33  
7-1  
7-4  
7-7  
4-29  
1-11  
1-15  
7-1  
4-31  
4-6  
4-3  
1-3  
1-1  
4-7  
4-4  
7-1  
1-6  
4-8  
4-30  
2-2  
4-12  
F
4-1  
4-38  
4-20  
4-39  
1-2  
4-11  
1-5  
4-6  
4-37  
4-20  
4-5  
7-5  
7-1  
1-14  
4-41  
G
G
4-35  
7-11  
2-4  
2-3  
4-17  
4-24  
x2  
2-4  
7-11  
H
H
2-5  
7-8  
7-11  
6
4
5
2
1
3
32  
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R-21JCA-F  
6
4
5
2
1
3
3-1  
CONTROL PANEL PARTS  
3-5  
A
B
C
D
E
F
A
3-2  
3-5  
3-2-1  
B
C
D
E
F
3-2-2  
3-3  
DOOR PARTS  
3-4  
5-2  
5-1-15  
5-1-16  
5-1-14  
5-1-2  
5-1  
5-1-12  
5-1-16  
5-1-18  
5-1-4-2  
5-1-16  
5-1-4-5  
x4  
5-1-13  
5-1-4-4  
5-1-4  
5-1-1  
5-1-4-3  
5-1-4-1  
5-1-4-5  
x2  
5-1-16  
5-1-12  
5-1-8  
5-1-7  
5-1-17  
5-1-11  
5-1-9  
5-3  
5-1-3  
5-1-8  
5-1-17  
5-1-5  
G
5-1-6  
G
MISCELLANEOUS  
6-2  
6-9  
5-1-10  
Actual wire harness may be different from illustration.  
H
H
6
4
5
2
1
3
33  
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R-21JCA-F  
PACKING AND ACCESSORIES  
TOP PAD ASSEMBLY  
(FPADBA385WRK0)  
WRAP COVER  
(SSAKHA034WRE0)  
TRAY HOLDER  
DOOR PROTECTION SHEET  
(SPADPA204WRE0)  
(SPADFA435WRE0)  
MENU STICKER  
6-7  
6-1  
BOTTOM PAD ASSEMBLY  
(FPADBA386WRK0)  
INSTRUCTION BOOK  
PACKING CASE  
Not Replaceable Items.  
SPAKCD803WREZ  
COPYRIGHT © 2005 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, me-  
chanical, photocopying, recording, or other-  
wise, without prior written permission of the  
publisher.  
'05 SHARP CORP. (10S0.80E) Printed in U.S.A  
34  
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