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