Sharp R-430BK User manual

SUPPLEMENTAL
SHARF? SERVICE MANUAL
R-430BK
R-430BW
R-430BD
S38Mi 07R430BE
MICROWAVE OVEN MODELS
R-430BK/R-430BW / R-430BD
In the interest of user-safety the oven is to be restored
to its original condition and only the parts identical to
those specified should be used.
R-430BW
WARNING TO SERVICE PERSONNEL: Microwave
ovens contain circuitry capable of producing
very high voltage and current. Contact with the
following parts may result in a severe, possibly
fatal electrical shock.(High Voltage Capacitor,
High Voltage Power Transformer, Magnetron,
High Voltage Rectifier Assembly, High Voltage
Harness etc..)
This is a supplemental Service Manual for Microwave Oven models R-430BK, R-430BW & R-430BD
These models are quite similar to the Base Model R-420BK (S/M#S28M104R420BE ).
This supplemental manual must be used in conjunction with the base model service manual for complete operation, service,
safety and replacement parts information.
TABLE OF CONTENTS
SECTION PAGE
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY. ........... Inside Front Cover
Before Servicing ............................................................. Inside Front Cover
Warning to Service Personnel ................................................................. 1
Forewordandwarning ....................................................................... 2
Specifications ............................................................................... 3
KeyUnitLayout ............................................................................. 4
Operation .................................................................................. 5
Servicing and Troubleshooting Guide .......................................................... 6
TestProcedures ............................................................................. 7
TouchControlOutline ....................................................................... 13
Component Replacement and Adjustment Procedure ........................................... 18
Microwave Measurement Procedure .......................................................... 22
Schematic / Wiring Diagram ................................................................. 23
Parts ..................................................................................... 28
Packing and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
SHARP ELECTRONICS CORPORATION
Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135

R-430BK
R-430BW
R-430BD
( 1
a
(b)
( )
C
(d)
( )
e
Do not operate or allow the oven to be operated with the door open.
Make the following safety checks on all ovens to be serviced before activating the magnetron
or other microwave source, and make repairs as necessary: (1) Interlock operation, (2) proper
door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to
or loosening of hinges and latches, (5) evidence of dropping or abuse.
Before turning on microwave power for any service test or inspection within the microwave gen-
erating compartments, check the magnetron, waveguide or transmission line, and cavity for
proper alignment, integrity, and connections.
Any defective or misadjusted components in the interlock, monitor, door seal, and microwave
generation and transmission systems shall be repaired, replaced, or adjusted by procedures
described in this manual before the oven is released to the owner.
A microwave leakage check to verify compliance with the Federal Performance Standard
should be performed on each oven prior to releasing the oven to the owner.
(RD21101U)
Before servicing an operative unit, perform a microwave emission check as per the Microwave
Measurement Procedure outlined in this service manual. If microwave emissions level is in excess
of the specified limit, contact SHARP ELECTRONICS CORPORATION immediately @
I-800-237-4277.
Ifthe unit operates with the door open, service person should 1)tell the user not to operate the oven
and 2) contact SHARP ELECTRONICS CORPORATION and DHHS immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit
found with emissions in excess of 4mW/cm2e The owner of the unit should be instructed not to use
the unit until the oven has been brought into compliance.
(RD81001 U)

SERVICE MANUAL
SHARI?
Microwave Ovens
R=430BK/R=430BW/R=43OBD
Foreword
This manual has been prepared to provide Sharp
Electronics Corporation personnel with complete
operation and service information for Sharp microwave
oven models R-430BWR=430BW/R=430BD.
It is recommended that service personnel carefully
study the entire text of this manual so they will be
qualified to render satisfactory customer service.
Check interlock switches and the door seal carefully.
Special attention must be given to avoid electrical shock
. and microwave radiation hazards.
This supplemental service manual contains up-
date information only. Please refer to base model
service manual (R-420BK) for complete service in-
formation
WARNING
Never operate the oven until the following points are en-
sured:
(A)The door is tightly closed.
(B)The door brackets and hinges are not defective.
(C)The door packing is not damaged.
(D)The door is not deformed or warped.
(E)There are no other visible signs of damage to the
oven. DANGER
Certain initial parts are intentionally not grounded
and present a risk of electrical shock only during
servicing. Service personnel - Do not contact the fol-
lowing parts while the appliance is energized;
High Voltage Capacitor, Power Transformer, Magne-
tron, High Voltage Rectifier Assembly and High volt-
age Harness.
If provided, Vent Hood, Fan Assembly and Cooling
Fan motor.
All of the parts marked “*” on parts list are used at volt-
ages more than 25OV.
Removal of the outer case cabinet gives access to volt-
age above 250V.
All of the parts marked “A” 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
Specifications
General Information
Key Unit Layout
Operation
Test Procedures
Touch Control Panel
and Adjustment
Microwave Measurement
Schematic Diaaram / Wirina

R-430BK
R-430BW
R-430BD
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of
producing very high voltage and current. Con-
tact with following parts may result in a severe,
possibly fatal, electrical shock.
(EXAMPLE)
High Voltage Capacitor, High Voltage Power
Transformer, Magnetron, High Voltage Rectifier
Assembly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
Danger High Voltage
Before Servicing
1. Disconnect the power supply cord and then remove
outer case
2. Open the door and block it open.
3. Discharge the high voltage capacitor.
WARNING:RlSK OF ELECTRICAL SHOCK. DISCHARGE
THE HIGH VOLTAGE CAPACITOR BEFORE SERVICING.
The high-voltage capacitor remains charged about 60 se-
conds after the oven has been switched off. Wait for 60 se-
conds and then short-circuit the connection of the high volt-
age capacitor (that is the connecting lead of the high voltage
rectifier) against the chassis with the use of an insulated
screwdriver.
Whenever troubleshooting is performed, the power sup-
ply must be disconnected. In some cases it may be nec-
essary to connect the power supply after the outer case
has been removed, in this event:
1.
2.
3.
4.
5.
6.
Disconnect the power supply cord, and then remove
outer case cabinet.
Open the door and block it open.
Discharge the high voltage capacitor.
Disconnect the leads to the primary of the power
transformer.
Ensure that the leads remain isolated from other
components and oven chassis by using insulation
tape.
After the above procedure, reconnect the power sup-
ply cord.
When the testing is completed
1. Disconnect the power supply cord and then remove
outer case cabinet.
2. Open the door and block it open.
3. Discharge the high voltage capacitor.
4. Reconnect the leads to the primary of the power
transformer.
5. Re-install the outer case cabinet.
6. Reconnect the power supply cord after the outer
case cabinet is installed.
7. Start the oven and check all functions.
After repairing
1. Reconnect all leads removed from components dur-
ing testing.
2. Re-install the outer case (cabinet).
3. Reconnect the power supply cord after the outer
case is installed.
4. Reconnect the power supply cord after the outer
case is installed.
5. Run the oven and check all functions.
Microwave ovens should not be operated 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 to see if the wa-
ter is hot. If the water remains cold, carry out Before
Servicing procedure and re-examine the connection to
the component being tested.
When all service work is completed and the oven is fully
assembled, the microwave power output should be
checked and the microwave leakage test should be car-
ried out.

R-430BK
R-430BW
R-430BD
SPECIFICATIONS
Item
Power Requirements
Description
120 Volts
14 Amperes
1650 Watts
60 Hertz
Single phase, 3 wire grounded
Power Output 1100 watts (IEC-705 Test Procedure)
Operating frequency of 2450 MHz
Case Dimensions Width 21ll&”
Height 1231;’(including feet)
Depth 1731~”
Cooking Cavity
1.3 Cu.Ft. Width 15”
Height 817/&
Depth 1631;’
Tray Size 141/i’ Diameter
Control Complement Touch Control System
Clock (I:00 - 12:59)
Timer (0 - 99 min. 99 sec.)
Microwave Power for variable cooking
Repetition Rate;
P-HI (HIGH) . . . s . . . . . Full power throughout the cooking time
P-90 , . . . . . . . . . . . . . . . . approx. 90% of full power
P-80 . . . . . . . . . . . , . . . . . approx. 80% of full power
P-70 (MED HIGH) . . . . approx. 70% of full power
P-60 . . . . . . . . . . . , . . . . . approx. 60% of full power
P-50 (MED) . . . . . . . . . . approx. 50% of full power
P-40 , . . . . , . . . . . . . . . . . approx. 40% of full power
P-30 (MED LOW) . . . . . approx. 30% of full power
P-20 . *. . . . . . . . . . . . . . . approx. 20% of full power
P-IO . . . . . . . . . , . . . . . . . approx. 10% of full power
P-O................... No power throughout the cooking time
FEATURES
Instant Action
Compu Defrost
Sensor Cook
Minute Plus
Kitchen Timer
Variable Power (10)
4 Stage Cooking
Oven Cavity Light
Safety Standard
Yes
UL Listed
FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J

R-430BK
R-430BW
R-430BD
Key Unit Layout
a. Indicators.
b. Lighted digital display.
c. Custom Help.
Features user friendly communications during
cooking procedure.
d. SENSOR COOKING pads.
Cooking time is determined by AH Sensor
e. Minute Plus pad.
Touch to start oven or Touch to cook for 1
minute at 100% power or to increase cook-
ing time.
f. Compu Cook pad.
Touch to cook certain foods.
g, Compu Defrost pad.
Touch to defrost certain foods.
h. Number selection pads.
i. Power Level pad. Touch to select micro-
wave power setting.
j. Clock pad.
Touch to set clock.
k. Beverage Center pad.
Touch to Reheat certain beverages.
I. Stop/Clear pad.
Touch to erase during programming.
Touch once to stop operation of oven during
cooking.
,. ,:
., j : : ;. ‘,. ‘.
...‘::‘: :
Custom, jj&&p ,:,I: ‘1,,,,,;,1“: i::‘-
..
‘.
/ SENSOR COOKING-
Touch twice to cancel cooking program. I I
m. Kitchen Timer pad.
Touch to set minute function.
n. Start/Touch On pad.
Touch to start oven.
-0
a
-0 b
-0
C
-0
d
I I /

The following is a description
during oven ope ration.
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
of compon
Sensor Cooking Condition
ent functions
When using the REHEAT function, the foods are cooked
without figuring time, power level or quantity. When the
oven senses enough steam from the food, it relays the
information to its microprocessor which will calculate the
remaining cooking time and the power level needed for
1best results.
When the food is cooked, water vapor is developed. The
. sensor “senses” the vapor and its resistance increases
gradually. When the resistance reaches the value set
according to the menu, supplementary cooking is
started.
The time of supplementary cooking is determined by ex-
periment with each food category and is inputted into the
LSI.
The following is an example of how the AH Sensor
Works:
1. Potatoes at room temperature
Vapor is emitted very slowly.
2. Heated potatoes. Moisture and humidity is emitted
rapidly. You can smell the aroma as it cooks.
3. Sensor detects moisture and humidity and calcu-
lates cooking time and variable power level.
Cooking Sequence
1. Touch REHEAT pad.
Note: The oven should not be operated in either mode
immediately after plugging in the unit. Wait five
minutes before cooking in sensor mode.
2. The coil to the shut off relay (RY-1) is energized, the
oven lamp, turntable motor and cooling fan motor are
turned on and the power transformer remains off.
3. After about 16 seconds, the cook relay (RY-2) is en-
ergized. The power transformer is turned on, micro-
wave energy is produced and first stage cooking is
started.
Note: The 16 second delay is for cooling time required
to remove any vapor from the oven cavity and
sensor. During this first stage, do not open the
oven door or touch the STOP/CLEAR pad.
4.
5.
6.
When the sensor detects the vapor emitted from the
food, the display switches over the remaining cook-
ing time and the timer counts down to zero.
At this time, the door may be opened to stir food, turn
it or season, etc.
When the timer reaches zero, an audible signal
sounds. The shut-off relay and cook relay are de-en-
ergized and the power transformer, oven lamp, etc.
are turned off.
By opening the door or touching the STOP/CLEAR
pad, the time of day will re-appear on the display and
the oven will revert to an OFF condition.

R-430BK
R-430BW
R-430BD
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.
Before replacing a blown monitor fuse, test the door sensing switch, primary interlock relay, sec-
ondary interlock switch and monitor switch for proper operation. (Refer to “Test Procedure” sec-
tion.)
Whenever troubleshooting is performed, the power supply must be disconnected. In some cases it may be neces-
sary to connect the power supply after the outer case cabinet has been removed. In this event,
1.
2.
3.
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 insulated tape.
6. After the above procedure install the outer case cabinet, reconnect the power supply cord.
Disconnect the power supply cord, and then remove outer case cabinet.
Open the door and block it open.
Discharge the high voltage capacitor.
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 the high voltage capacitor.
4. Reconnect the leads to the primary of the power transformer.
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.
Troubleshooting Guide
Sensor Cooking Condition
Problem Possible Cause Test Procedure
The oven is in the sensor cooking Control Unit Procedure G
condition but AH sensor does not end
or AH sensor turns off about a maxi-
mum of 30 minutes after start.
When a cup of water is heated by AH Sensor
sensor, the oven does not shut off
when the water is boiling.
Procedure L

R-430BK
R-430BW
R-430BD
Procedure Letter Component Test
G. Touch Control Panel Assembly Test
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. There-
fore, unlike conventional microwave ovens, proper maintenance can not be performed with only a
voltmeter and ohmmeter. In this service manual, the touch control panel assembly is divided into two
control units, Control Unit and Key Unit. Troubleshooting by unit replacement is described according
to the symptoms indicated.
Before testing
1. Disconnect the power supply cord, and then remove outer case cabinet.
2. Open the door and block it open.
3. Discharge the 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 insu-
lated tape.
6. After that procedure, re-connect the power supply cord.
1. Key Unit
1. Disconnect the power supply cord, and then remove outer case cabinet
2. Open the door and block it open.
3. Discharge the high voltage capacitor.
4. Check unit ribbon connection before replacement.
5. Reconnect all leads removed from components during testing.
6. Re-install the outercase (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
The following symptoms indicate a defective key unit. Replace the key unit.
a) When touching the pads, a certain pad produces no signal at all.
b) When touching a number pad, two figures or more are displayed.
c) When touching the pads, sometimes a pad produces no signal.
If the key unit is defective.
1. Disconnect the power supply cord, and then remove outercase cabinet.
2. Open the door and block it open. Y
3. Discharge the high voltage capacitor.
4. Replace the key unit.
5. Reconnect all leads removed from components during testing.
6. Re-install the outercase cabinet.
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
2. Control Unit
The following symptoms indicate a defective control unit. Before Replacing the control unit, per-
form the Key unit test (Procedure K) to determine if control unit is faulty.
2-1 In connection with pads.
a) When touching the pads, a certain group of pads do not produce a signal.
b) When touching the pads, no pads produce a signal.
2-2 In connection with indicators.
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
d) The corresponding segments of all digits do not light up; or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) All the segments of a digit flicker.
2-3 Other possible problems caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
7

R-430BK
R-430BW
R-430BD TEST PROCEDURES
Procedure Letter Component Test
G. Touch Control Panel Assembly Test (Confinued)
When testing is completed,
1. Disconnect the power supply cord, and then remove outer case cabinet.
2. Open the door and block it open.
3. Discharge the high voltage capacitor.
4. Reconnect all leads removed from components during testing.
5. Re-install the outercase cabinet.
6. Reconnect the power supply cord after installing the outer case cabinet.
7. Run the oven and check all functions.
H. Relay Test
1. Disconnect the power supply cord, and then remove outer case cabinet.
2. Open the door and block it open.
3. Discharge the 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 insulated
tape.
6. After the above procedure , reconnect the power supply cord.
7. Check voltage between Pin No. 1 of the 2 pin connector (A) and the common terminal of the relay
RYI on the control unit with A.C. voltmeter. The meter should indicate 120volts. If not, check oven
circuit.
RY-1 and RY-2 Relay Test
These relays are operated by D.C. voltage.
Check voltage at the relay coil with a DC. 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.
1Relay Symbol 1Operational Voltage 1Connected Components
RY 1
RY2
Approx. 24.3 V DC
Approx. 23.5 V DC
Oven lamp/Turntable motor/Cooling fan motor
Power transformer
8. Disconnect the power supply cord.
9. Open the door and block it open.
10.Discharge the 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 installing the outer case cabinet.
14.Run the oven and check all functions.
I. Foil pattern on the printed wiring board Test
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary
on the PWB, which acts as a fuse.
1 Foil Pattern check and repairs
1. Disconnect the power supply cord, and then remove outer case cabinet.
2. Open the door and block it open.
3. Discharge the high voltage capacitor.
4. Follow the troubleshooting guide given below for repair.
1Steps 1Occurrence 1Cause or Correction
1 Only pattern at “a” is broken. * Insert jumper wire Jl and solder.
I 2 IPattern at “a” and ‘?I” are broken I* Insert the coil RCILF~OO~YAZZ between “c” and “d”. 1
8

R-430BK
EEY
TEST PROCEDURES
.’ Procedure Letter Component Test
1. Continued
Procedures to be taken when the foil pattern of the printed wiring board (PWB)
is open
5.Make a visual inspection of the varistor burn
damage and test the transformer with an ohm-
meter for the presence of layer short-circuit
(check the primary coil resistance which is
approximately 210 Q * 15%). If any abnormal
condition is detected, replace the defective
part(s) m m
0
6. Reconnect all leads removed from components during testing.
7. Re-install the outercase (cabinet).
8. Reconnect the power supply cord after installing the outer case cabinet.
9. Run the oven and check all functions.
2. Follow the troubleshooting guide given below. If indicator does not light up after above check and
repairs are finished.
1. Disconnect the power supply cord, and then remove outer case cabinet.
2. Open the door and block it open.
3. Discharge the 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 insu-
lated tape.
6. After the above procedure, reconnect the power supply cord.
7. Follow the troubleshooting guide given below for repair.
1Steps (Occurrence
1
I I
The rated AC voltage is not present between Check supply voltage and oven power cord
Pin No.1 of the 2-pin connector (A) and the
common terminal of the relay RYI .
2
I I
The rated AC voltage is present at primary Low voltage transformer or secondary circuit
side of low voltage transformer. defective. Check and repair.
8. Disconnect the power supply cord, and then remove the outer case.
9. Open the door and block it open,
IO. Discharge the 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 cabinet is installed.
14.Run the oven and check all functions.
9

R-430BK
R-430BW
R-430BD TEST PROCEDURES
Procedure Letter Component Test
J Compu Defrost Test
1. Place one cup of water in the center of the turntable tray in the oven cavity.
2. Close the door, touch the “COMPU DEFROST” pad once and touch the number pad “I”, and touch
the number pad “5”. Then touch the “START” pad.
3. The oven is in “COMPU DEFROST’ cooking mode.
4. The oven will operate as follows:
Weight 1st Stage 2nd Stage 3rd Stage 4th Stage
Level Time Level Time Level Time Level Time
0.5 70% 47 sec. 0% 52 sec. 50% 32 sec. 30% 40 sec.
5. If improper operation is indicated, the control unit is probably defective and should be checked.
K. Key Unit Test
1. Disconnect the power supply cord, and then remove outer case cabinet.
2. Open the door and block it open.
3. Discharge the high voltage capacitor.
4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon is
making good contact and verify that the door sensing switch operates properly (contacts are
closed when the door is closed and open when the door is open). Ifthe door sensing switch is good,
disconnect the flat ribbon cable that connects the key unit to the control unit and make sure the
door sensing switch is closed (either close the door or short the door sensing switch connector).
Use the key unit matrix indicated on the control panel schematic and place a jumper wire between
the pins that correspond to the STOP/CLEAR pad making momentary contact. If the control unit
responds by clearing with a beep the key unit is faulty and must be replaced. If the control unit does
not respond, it is faulty and must be replaced.If a specific pad does not respond, the above method
may be used (after clearing the control unit) to determine if the control unit or pad is at fault.
5. Reconnect all leads removed from components during testing.
6. Re-install the outer case cabinet.
7. Reconnect the power supply cord after installing the outer case cabinet
8. Run the oven and check all functions.
G8 G7 G6 G5 G4 G3 G2 Gl
8 5 4 3 2 1 Custom
Reheat Popcorn Help
0
Z 0 9 8 7 Fresh
6 Baked KITCHEN
potato vegetables TIMER
Minute Compu Fish/ Frozen Ground POWER
Z Plus Defrost seafood vegetables Poultry meat LEVEL
cv Start Frozen Beverage Frozen stop
6 Touch Clock snacks center Rice Compu
Cook main dish Clear
KEY UNIT
10

R-430BK
EEY
Procedure Letter Component Test
L. AH Sensor Test
Checking the initial sensor cooking condition
1. The oven should be plugged in at least five minutes before sensor cooking.
2. Room temperature should not exceed 95” F (35” C).
3. The unit should not be installed in any areas where heat and steam are generated. The unit should
not be installed, for example, next to a conventional surface unit.
4. Exhaust vents are provided on the bottom of the unit for proper cooling and air flow in the cavity.
To permit adequate ventilation, be sure to install so as not to block these vents.
There should be some space for air circulation.
5. Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any mois-
ture with a dry cloth or paper towel.
6. The sensor works with food at normal storage temperature. For example, chicken pieces would
be at refrigerator temperature and canned soup at room temperature.
7. Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. The
sensor will detect the vapor given off by the spray and turn off before the food is properly cooked.
8. If the sensor has not detected the vapor of the food, ERROR will appear and the oven will shut off.
Water load cooking test
Note: The cabinet should be installed and screws tightened. _
Make sure the oven has been plugged in at lease five minutes before checking sensor cook opera-
tion.
1. Fill approximately 200 milliliters (7.2 oz.) of tap water in a 1000 milliliter measuring cup.
2. Place the container on the center of tray in the oven cavity. -
3. Close the door.
4. Touch Reheat pad once and touch the Start pad, Now, the oven is in the sensor cooking operation
and “REHEAT“ “SENSOR“ “COOK“ will appear in the display.
5. Now the oven will operate for the first 16 seconds without generating microwave energy.
Note: ERROR will appear if the door is opened or Stop/Clear pad is touched during first stage of sen-
sor cooking.
6. After approximately 16 seconds, microwave energy is produced, the oven should turn off when
water is boiling (bubbling).
If the oven does not turn off, replace the AH sensor or check the control unit.
Testing Method for AH Sensor and/or Control Unit
To determine if the sensor is defective, the simplest method is to replace it with a new sensor.
1. Disconnect the power supply cord, and then remove outer case cabinet.
1
2. Open the door and block it open.
3. Discharge the high voltage capacitor.
4. Remove the AH sensor.
5. Install the new AH sensor.
6 Reconnect all leads removed from components during testing.
7. Re-install the outer case.
8. Reconnect the power supply cord and check the sensor cook operation, proceed as follows:
A. Fill approximately 200 milliliters (7.2 oz.) of tap water in a 1000 milliliter measuring cup.
B. Place the container on the center of tray in the oven cavity.
C. Close the door.
D. Touch Reheat pad once and touch the Start pad.
E. The control panel is in automatic Sensor operation.
F, The oven will turn off automatically when the water is boiling (bubbling).
If the new sensor does not operate properly, the problem is with the control unit.
Checking the Control Unit
1. Disconnect the power supply cord, and then remove outer case cabinet.
2. Open the door and block it open.
3. Discharge the high voltage capacitor.
4. Disconnect the sensor connector that is mounted to control panel.
5. Then connect the dummy resistor circuit (see fig. A) to the sensor connector of control panel.
11

R-430BK
R-430BW
R-430BD
Procedure Letter Component Test
L. Checking the Control Unit (Confinued)
6. Disconnect the wire leads to the primary of power transformer.
7. Ensure that these leads remain isolated from other components and oven chassis by using insu-
lated tape.
8. After that procedure, reconnect the power supply cord.
9. Check the sensor cook operation proceed as follows:
A. Touch REHEAT pad once and touch Start pad.
B. The control panel is in the sensor cooking operation.
C. After approximately 20 seconds, push plunger of select switch for more than 3 seconds. This
condition is the same as judgment by AH sensor.
D. After approximately 3 seconds, the display shows “XX. XX’ which is the remaining cooking
time, and the display counts down,
If the above is not the case, the control unit is probably defective.
If the above checks positive, the AH sensor is probably defective.
lO.Disconnect the power supply cord, and then remove outer case cabinet.
11.Open the door and block it open.
12.Discharge the high voltage capacitor.
13.Disconnect the dummy resistor circuit from the sensor connector of control panel.
14Carry out the necessary repair.
15Reconnect all leads removed from components during testing and repairing.
16.Re-install the outer case cabinet.
17.Reconnect the power supply cord after the outer case is installed. Run the oven and check all func-
tions.
18.Carry out the “Water load cooking test” again and ensure that the oven works properly.
F-l +
TO CONNECTOR (F)
ON CONTROL UNIT
CONNECTOR
1
PLUNGER
J COM
~--k-l
NC
NO
2
F-2 + Ri
F-3 + 3
R2
RI, R2: 22&J + 1% ll2W
R3: 4.3ka + 5% 1/4W
R4: 1MQ + 5% 1/4W
Figure A. Sensor Dummy Resistor Circuit
12

R-430BK
E%dl
OUTLINE OF TOUCH CONTROL PANEL
The touch control section consists of the following units
as shown in the touch control panel circuit:
(1) Key Unit
(2) Control Unit (The Control Unit consist of Power Unit
and LSI Unit)
The principal functions of these units and their related
signals are explained below.
Key Unit
The key unit is composed of a matrix. Signals generated
in the LSI are sent to the key unit through P20 - P27.
When a key pad is touched, a signal is completed
through the key unit and passed back to the LSI through
AN8, AN9, AN1 0 and AN1 1 to perform the function that
was requested.
Control Unit
The Control unit consists of the following:
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 be-
cause it works on commercial frequency.
ACL Circuit
A circuit to generate a signal which resets the LSI to
the initial state when power is applied.
Buzzer Circuit
The buzzer is responsive to signals from the LSI to
4.
5.
6.
7.
8.
emit Audible sounds (key touch sound and comple-
tion sound).
Door Sensing Switch
A switch to “tell” the LSI if the door is open or closed.
Relay Circuit
To drive the magnetron, fan motor, turntable motor
and oven lamp.
Indicator Circuit
This circuit consists of 45 segmenets and 5 com-
mon electrodes using a liquid Crystal Display.
Back Light Circuit
A circuit to drive the back light (Light emmitting
diodes LDI -LDlO).
It incorporates a very small error because it works
on commercial frequency.
Power Source Circuit
This circuit generates voltage necessary in the con-
trol unit from the AC line voltage.
In addition, the synchronizing signal is available in
order to compose a basic standard time in the clock
circuit.
Symbol Voltage Application
vc - 5v LSI (ICI),
9. Absolute Humidity Sensor Circuit
This circuit detects the humidity of the food which is
being cooked, to control automatic cooking.
13

R-430BK
R-430BW
R-430BD
The I/O signals of the LSI (IZA866DR) is detailed in the following table.
( Pin No. 1 Signal 1 I/O 1Description
1
2
3
4
/ 5 I
6
7
8
9
10
,
11
12
13
14
15
16
17
18
19
20
21
AN8 IN
AN9 IN
AN10 IN
Signal coming from touch-key.
When either G-12 line on key matrix is touched, a corresponding signal out of P20-P27 will be
input into AN8. When no key is touched, the signal is held at “H” level.
Signal similar to AN8.
When either Gil line on key matrix is touched, a corresponding signal will be inputted into AN9.
Signal similar to AN8.
When either GIO line on key matrix is touched, a corresponding signal will be inputted into
ANIO.
AN11 IN Signal similar to AN8.
When either G9 line on key matrix is touched, a corresponding signal will be inputted into AN11.
AVSS IN A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to VC.
TEST IN Connected to VC.
x2 OUT Terminal not used.
x2 IN Connected to GND.
vss IN Power source voltage: - 5V.
VC voltage of power source voltage to drive the LSI is input to VSS terminal. Connected to VC.
OSCI IN Internal clock oscillation frequency setting input.
The internal clock frequency is set by applying the ceramic filter oscillatior circuit with respect
to OSCI terminal. J
osc2 OUT Internal clock oscillation frequency control output.
Output to control oscillation input of 0SC2.
RESET IN Auto-clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied. Temporarily set to
‘I” level the moment power is supplied, at this time the LSI is reset. Thereafter set at “H” level.
MD0 IN Connected to GND.
P20 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is inputted to AN8 - AN11 terminal while
one of G8 line keys on key matrix is touched.
P21 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is inputted to AN8 - AN11 terminal while
one of G7 line keys on key matrix is touched.
P22 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is inputted to AN8 - AN11 terminal while
one of G6 line keys on key matrix is touched.
P23 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is inputted to AN8 - AN11 terminal while
one of G5 line keys on key matrix is touched.
P24 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is inputted to AN8 - AN11 terminal while
one of G4 line keys on key matrix is touched.
P25 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is inputted to AN8 - AN11 terminal while
one of G3 line keys on key matrix is touched.
P26 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is inputted to AN8 - AN11 terminal while
one of G2 line keys on key matrix is touched.
P27 OUT Key strobe signal.
Signal applied to touch-key section. A pulse signal is inputted to AN8 - AN11 terminal while
one of Gl line keys on key matrix is touched.
14

R-430BK
R-430BW
R-430BD
Signal I/O DescriptionPin No.
22 P30 OUT Signal to sound Buzzer (2.0 kHz).
0.1 sec.
B: completion sound
23 P31 OUT Terminal not used.
24 P32 OUT Common data signal: COM5.
Connected to LCD signal COM5 (Pin No. 37).
Segment data signal.
Connected to LCD.
The relation between signals are as follows:
LSI signal (Pin No.) LCD (Pin No.)
P33 (25) ............ SEG32 (38)
P34 (26) ............ SEG33 (39)
P35 (27) ............ SEG34 (40)
P36 (28) ............ SEG35 (41)
P37 (29) ............ SEG36 (42)
SEG 1 (39) ............ SEGI (1)
SEG 2 (40) ............ SEG2 (2)
SEG 3 (41) ............ SEG3 (3)
SEG 4 (42) ............ SEG4 (4)
SEG 5 (43) ............ SEGS (5)
SEG 6 (44) ............ SEG6 (6)
SEG 7 (45) ............ SEG7 (7)
SEG 8 (46) ............ SEG8 (8)
SEG 9 (47) ............ SEG9 (9)
SEG 10 (48) ......... SEGIO (10)
SEG 11 (49) ......... SEGII (11)
SEG 12 (50) ......... SEG12 (12)
SEG 13 (51) ......... SEG13 (13)
SEG 14 (52) ......... SEG14 (14)
SEG 15 (53) ......... SEG15 (15 & 32)
SEG 16 (54) ......... SEGIG (16)
SEG 17 (55) ......... SEG17 (17)
SEG 18 (56) ......... SEG18 (18)
25-29 P33-P37 OUT
LSI signal (Pin No.) LCD (Pin No.)
SEG 19 (57) ......... SEGIS (19)
SEG 20 (58) ......... SEG20 (20)
SEG 21 (59) ......... SEG21 (21)
SEG 22 (60) ......... SEG22 (22)
SEG 23 (61) ......... SEG23 (23)
SEG 24 (62) ......... SEG24 (24)
SEG 25 (63) ......... SEG25 (25)
SEG 26 (64) ......... SEG26 (26)
SEG 27 (65) ......... SEG27 (27)
SEG 28 (66) ......... SEG28 (28)
SEG 29 (67) ......... SEG29 (29)
SEG 30 (68) ......... SEG30 (30)
SEG 31 (69) ......... SEG31 (31)
SEG 32 (70) ......... SEG37 (43)
SEG 33 (71) ......... SEG38 (44)
SEG 34 (72) ......... SEG39 (45)
SEG 35 (73) ......... SEG40 (46)
SEG 36 (74) ......... SEG41 (47)
SEG 37 (75) ......... SEG42 (48)
SEG 38 (76) ......... SEG43 (49)
SEG 39 (77) ......... SEG44 (50)
SEG 40 (78) ......... SEG45 (51)
30 vss IN Power source voltage: - 5V.
VC voltage of power source voltage to drive the LSI is input to VSS terminal. Connected to VC.
Power source voltage input terminal
Standard voltage for LCD.
Power source voltage input terminal
Standard voltage for LCD. Connected to GND.
Power source voltage GND (OV)
The power source voltage to drive the LSI is input to VCC terminal.
Common data signal: COMI.
Connected to LCD signal COMI (Pin No. 33).
Common data signal: COM2.
Connected to LCD signal COM2 (Pin No. 34).
Common data signal: COM3.
Connected to LCD signal COM3 (Pin No. 35).
Common data signal: COM4.
Connected to LCD signal COM4 (Pin No. 36).
Segment data signal
Signal Similar to P33.
Segment data signal
Signal Similar to P33.
Power source voltage GND (OV)
The power source voltage to drive the LSI is input to VCC terminal.
31-32 VL3-VL2 IN
33 VL3 IN
34 vcc IN
35 COM4 OUT
36 COM3 OUT
37 COM2 OUT
38 COMI OUT
39-69 SEGl -SEG31 OUT
70-78 SEG32-SEG40
\ OUT
79 vcc IN
15

R-430BK
R-430BW
R-430BD
Pin No. Signal I/O Description
80-84 PIO-PI4 OUT Used for Initial balancing of the bridge circuit (absolute humidity sensor).
85-86 P15-PI6 OUT Terminal not used.
87 PI7 OUT Oven lamp, fan motor and turntable motor driving signal.
To turn on and off shut off relay RYI. The square waveform voltage is delivered to the RY-1
driving circuit and RY-2 control circuit.
16.7 msec.
” 1 ~ ‘I-_----I n ‘I R--L---H
I I
I During Cooking I
‘( Y
88-89 P40-P41 OUT Terminal not used.
90 P42 OUT Magnetron high-voltage circuit driving signal.
To turn on and off cook relay RY2. In high operation, the signals holds “H” level during micro-
wave cooking and ‘I” level while not cooking. In other cooking modes (variable cooking) the
signal turns to “H” level and “L” level in repetition according to the power level.
- - -- ------- - -------- H: GND
P-HI
91 IRQO IN
PF_ 24 sec. +rc i’
Signal synchronized with commercial power source frequency.
This is the basic timing for time processing of LSI.
H: +5V
L: GND
92 AVCC
93 AN0
94 AN1
IN
IN
IN
I 16.7 msec. d
I I
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to GND.
Used for Initial balancing of the bridge circuit (absolute humidity sensor). This input is an analog
input terminal from the AH sensor circuit, and connected to the A/D converter built into the LSI.
AH Sensor input.
This is an analog input terminal from the AH sensor circuit and is connected to the A/D converter
built in to the LSI.
95 AN2 IN To Input signal which communicates the door open/close information to the LSI,
Door closed; “H” level signal (OV).
Door opened ‘I_” level signal (-5V).
96 AN3 OUT Terminal not used.
97-100 AN&AN7 IN Terminal to change functions according to the Model.
By using the A/D converter contained in the LSI, DC voltage in accordance with the Model in
operation is applied to set up its cooking constant.
16

,
. .-
Precautions for Handling Electronic
Components
This unit uses CMOS LSI in the integral part of the cir-
cuits. When handling these parts, the following precau-
tions should be strictly followed:
CMOS LSI have extremely high impedance at its input
and output terminals. For this reason, it is easily in-
fluenced by surrounding high voltage power sources,
static electricity charge in clothes, etc. and sometimes
it is not fully protected by the built-in protection circuit.
In order to protect CMOS LSI, practice the following
guidelines:
1. When storing and transporting LSI, thoroughly wrap
them in aluminum foil.
Also wrap all PW boards in aluminum foil.
2. When soldering, the technician should use a ground-
ing strap as shown in the figure and use a grounded
soldering iron and work table.
Approx. 1Ma
/
Shapes of Electronic Components
P
CB
E -
Transistor
2SB1238
Transistor
KRC243M
Servicing of Touch Control Panel
We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the pre-
cautions you must take when doing so.
To perform the servicing, power to the touch control pan-
el is available either from the power line of the oven itself
or from an external power source.
Servicing The Touch Control Panel With
The Oven Power Supply
The high voltage transformer of the microwave oven
is still live during servicing and presents a hazard.
When checking the performance of the touch control
panel, put the outer cabinet on the oven to avoid touch-
ing the high voltage transformer or unplug the primary
terminal (connector) of the high voltage transformer to
turn it off; the end of such connector must be insulated
with an insulating tape. After servicing, be sure to re-
connect the leads to their original locations.
1. Onso me models, the power supply co
#rdbetween 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 in-
cluded) of the touch control panel while keeping it
connected to the oven.
2. On some models, the power supply cord between the
touch control panel and the oven proper is long
enough that they may be separated from each other.
For those models, 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 dummy resistor(s)
with resistance equal to that of the controls are used.
Servicing The Touch Control Panel With An
External Power Supply
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 acti-
vates 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 sen-
sor-related controls of the touch control panel by using
the dummy resistor (s).
Servicing Tools
Tools required to service the touch control panel assem-
bly.
1. Soldering iron: 30W
(It is recommended to use a soldering iron with a
grounding terminal.)
2. Oscilloscope: Single beam, frequency range:
DC-IOMHz type or more advanced model.
3. Hand tools.
Other Precautions
1.
2.
3.
4.
5
Before turning on the power source of the control unit,
remove the aluminum foil applied for preventing static
electricity.
Connect the connector of the key unit to the control
unit being sure that the lead wires are not twisted.
After aluminum foil is removed, be careful that abnor-
mal voltage due to static electricity etc. is not applied
to the input or output terminals.
Attach connectors, electrolytic capacitors, etc. to
PWB, making sure that all connections are tight.
Be sure to use specified components where high pre-
cision is required.
17

R-430BK
R-430BW
R-430BD COMPONENT REPLACEMENT/ADJUSTMENT PROCEDURE
icrowave ovens contain circuitry capable of producing very high voltage and current, contact with the following
artsmay result in severe, possibly fatal, electric shock.
(ample
gh Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness
c..
Avoid possible exposure to microwave energy. Please follow the
instructions below before operating the oven.
Disconnect the power supply cord.
Visually check the door and cavity face plate for
damage (dents, cracks, signs of arcing etc.).
arty out any remedial work that is necessary before
operating the oven.
onot operate the oven if any of the following condi-
Ins exist;
Door does not close firmly.
Door hinge, support or latch hook is damaged.
The door gasket or seal is damaged.
The door is bent or warped.
5. There are defective parts in the door interlock sys-
tern.
6. There are defective parts in the microwave gener-
ating and transmission assembly.
7. There is visible damage to the oven.
Do not operate the oven:
1. Without the RF gasket (Magnetron).
2. If the wave guide or oven cavity are not intact.
3. If the door is not closed.
4. If the outer case cabinet is not fitted.
3 prevent electric shock, take the following pre-
3utions.
Before wiring.
;) Disconnect the power supply cord.
2) Open the door and block it open.
3) Discharge the high voltage capacitor and wait for
60 seconds.
!. Don’t let the wire leads touch the following parts;
1) High voltage parts:
Magnetron, High voltage Transformer, High volt-
age capacitor and High voltage rectifier assembly.
2) Hot parts:
Oven lamp, Magnetron, High voltage Transform-
er and oven cavity.
3) Sharp edge:
Bottom plate, oven cavity, waveguide, flange,
chassis support and other metallic plate.
4) Movable parts (to prevent a fault)
Fan blade, Fan motor, Switch , Switch lever, and
Open button.
3. Do not catch the wire leads in the outer case cabi-
net.
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 Wiring Diagram.
18