8
| Download: |  |
| Mirror Download [FCC.gov] | |
| Document ID | 76495 |
| Application ID | s093mWmw4LDkQtSyce6wsQ== |
| Document Description | 8 |
| Short Term Confidential | No |
| Permanent Confidential | No |
| Supercede | No |
| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 99.4kB (1242528 bits) |
| Date Submitted | 1999-12-16 00:00:00 |
| Date Available | 1998-09-24 00:00:00 |
| Creation Date | 2001-05-11 01:01:17 |
| Producing Software | Acrobat Distiller 4.0 for Windows |
| Document Lastmod | 2001-05-11 01:01:44 |
| Document Title | 76495.pdf |
| Document Author: | VicodinES /CB /TNN |
l] 190 ’/
SUPPLEMENTAL A W N -
SHARP. SERVICE MANUAL
838M107R4SOBE
MICROWAVE OVEN MODELS
FI-4305K/FI-43OBW I R-43OBD
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.
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,
R—Asoew High Voltage Rectifier Assembly, High Voitege
Harness etc..)
This Is a supplemental Service Manual for Microwave Oven models R—430BK, R-430BW & R-AQOBD
These models are quite similar to the Base Model Fi-42OBK (S/MltSZBMl 04R420EE ),
This supplemental manual must be used in conjunction with the base model servrce manual iorcomplete operation, service,
salety and replacement pans information.
TABLE OF CONTENTS
SECTION PAGE
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING senwce T0
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY. . Inside Front Cover
Before Servicing ............ . 4 . Inside Front Cover
Waming to Service Personnel .
Foreword and Warning . . .
Specifications
Key Unit Layout .
Operation ...............
Servicing and Troubleshooting uide ,
Test Procedures ..................
Touch Control Outline .......
Component Replacement and Adjustment Procedure .
Microwave Measurement Procedure ............
Schematic / Wiring Diagram ......
Pans ...............
Packing and Accessories .
mwflmmamN—A
SHARP ELECTRONICS CORPORATION
Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135
SERVICE MANUAL
SHARP.
Microwave Ovens
R-430BK/R-4SDBWIR-43DBD
Foreword
This manual has been prepared to provide Sharp
Electronics Corporation personnel With complete
operation and service inlormaticn for Sharp microwave
oven models R-4308K/Rs4SOBW/R4SOBD
It is recommended that service personnel carefully
study the entire text of this manual so they will be
qualified to render satislaclory customer service.
Check interlock switches and the door seal carefully.
Special attention must be given to avotd electrical shock
and microwave radiation hazards,
This supplemental service manual contains up-
date information only. Please refer to base model
service manual (Fl-4ZOBK) lor 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 detective.
(C)The door packing is not damaged.
(DiThe door is not deformed or warped.
(E) There are no other visible signs of damage to the
oven.
DANGER
Certain inltlal pans are intentionally not grounded
and present a risk of electrical shock only during
servicing. Service personnel - Do not contact the lot-
Iowing parts while the appliance is energized;
High Voltage Capacltor, Power Transtormer, Magne-
tron, High Voltage Rectifier Assembly and ngh volt-
age Harness.
It provided, Vent Hood, Fan Assembly and Cooling
Fan motor.
All of the pans marked “'" on parts list are used at voltv
ages more than 250V.
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
Wyn/mar) // 5/
Specifications
General Information
Key Unit Layout
Operation
Troubleshooting I
Test Procedures
Touch Control Panel
Component Replacement
and Adiustment
Microwave Measurement
Schematic Diagram I Wiring
Fl-ASDEK
Fl—4BUBW
H-ASOBD
”MW/ti W —
H-ASOBK
macaw
H-43OBD
SPECIFICATIONS
Item Description
Power Requirements 120 Volts
14 Amperes
1 650 Watts
60 Hertz
Single phase, 3 wire grounded
Power Output
Case Dimensions
11oo'wans (IEC-705 Test Procedure)
Operating frequency 0! 2450 MHz
' Width 21mm"
Height 123/5' (including feet)
Dep|h 173/3"
Cookingficayity Width 15”, 7 7
1.3 Cu.Ft. Height 8‘7123"
Depth 16314”
Tray Size 14Va“ Diameter
Control Complement
VYes
Touch Control System
Clock (1:00 . 12:59)
Timer (0 - 99 min. 99 sec.)
Microwave Power for variable cooking
Repetition Hate;
PAHI (HIGH) . . . Full power throughout the cooking time
P-90 . . approx. 90% of lull power
PvBO ................. approx. 80% of lull power
P-7O . approx. 70% of full power
P-60 . approx. 60% of full power
P-50 . approx, 50% of full power
P-40 . . approx. 40% offuli power
P-30 (MED LOW) . . approx. 30% of full power
P—20 . . . . . . approx. 20% offuli power
P~10 . 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
VOven Cavrty Light 7
Safety Standard
UL Listed
FCC Authorized
DHHS Fiules, CFFi. Title 21, Chapter 1, SubchaplerJ
4flybmflo/W
Ft- ASOBK
R- 430W
R 43mm
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
The following is a description of component functions
during oven operation,
Sensor Cooking Condition
When using the REHEATlunction, thefoods are cooked
without figuring time, power level or quantity. When the
oven senses enough steam lrom the food, it relays the
information to its microprocessorwhich will calculate the
remaining cooking time and the power level needed for
best results.
When the food is cooked, watervapor 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 tollowing 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.
Senscfl MlCHOWAl/E
3. Sensor detects moisture and humidity and calcu-
lates cooking time and variable power level.
Cooking Sequence
1. Touch HEHEAT pad.
Note: The oven should not be operated in either mode
immediately after plugging in the unit. Wait five
minutes belore cooking in sensor mode,
2. The coil to the shut oft relay (RY-1) is energized, the
oven lamp, turntable motor and cooling fan motorare
turned on and the power transtorrner remains off.
3 Alter about 16 seconds, the cook relay (HY-2) is en-
ergized. The power transtormer 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. When the sensor detects the vapor emitted trom the
tood, 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.
5, When the timer reaches zero, an audible signal
sounds. The shut-oft relay and cook relay are de-en-
ergized and the power transformer, oven lamp, etc.
are turned otf,
6. By opening the door or touching the STOP/CLEAR
pad, the time ot day will reappear on the display and
the oven Will revert to an OFF condition.
TEST PROCEDURES
Procedure Letter Component Test
G.
Touch Control Panel Assembly Test
The touch control panel consists cl circuits including semiconductors such as LSl, ICs, etc. There-
fore, unlike conventional microwave ovens. proper maintenance can not be perlormed 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 translormer.
5. Ensure thatthese leads remain isolated lrcm othercomponents and oven chassis by using insu»
Iated tape.
6. After that procedure, reconnect 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 lrom 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 lollowing symptoms indicate a detective 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.
Disconnect the power supply cord, and then remove outercase cabinet.
Open the door and block it open.
Discharge the high voltage capacitor.
Replace the key unit.
Reconnect all leads removed from components during testing.
. Re-install the outercase cabinet.
. Reconnect the power supply cord after the outer case is installed.
. Run the oven and check all functions.
2. Control Unit
The following symptoms indicate a detective 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 ol 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 git, all or some segments do not light up.
b) At a certain igit, brightness is low.
0) 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 llicker.
2-3 Other possible problems caused by defective control unit.
a) Buzzerdoes not sound or continues to sound.
to) Clock does not operate properly.
c) Cooking is not possible.
mummewwe
”7 yaw/40117 _
R-JSOQK
Fl-ASOBW
Fl-4ZWBD
TEST PROCEDURES
Procedure Letter Component Test
I. Continued
Procedures to be taken when the toil pattern of the printed wiring board (PWB)
is open 0
5. Make a visual inspeclion of the varislor burn E
damage and test the transformer with an ohm- —l
meter for the presence at layer shun-circuit "U
(check the primary coil resistance which is 8
approximately 21 0 (2 :l: 15%). ii any abnormal to
condition is detected, replace the defective 01
partis). g
ID
[11
6. Reconnect all leads removed from components during testing.
7. Reinstall the outeroase (cabinet).
8. Reconnect the power supply cord after installing the outer case cabinet.
9. Run the oven and check all iunctionst
2 Follow the troubleshooting guide given below. It 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 translonner.
5. Ensure that the leads remain isolated from other components and oven chassis by using insu-
Iated tape.
6. After the above procedure, reconnect the power supply cord,
7. Follow the troubleshooting guide given below for repair.
Steps Occurrence Cause or Correction
1 The rated Acvoltage is not present between Check supply voltage and oven power cord
Pin No.1 ot the 2-pin connector (A) and the
common terminal at the relay RY1 .
2 The rated AC voltage is present at primary Low voltage transformer or secondary circuit
side at low voltage trensiormer. detective. Check and repair.
8. Dlsconnect the power supply cord, and then remove the outer case.
9. Open the door and block it open.
10.Discharge the high voltage capacitor.
“Reconnect all leads removed lrorn components during testing.
12.Fle—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.
MPH} ”ado/JV _
R-ASOBK
R-430ElW
RAMBO
TESTPROCEDURES
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 heatand steam are generated. The unitshould
not be installed, lor 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 exteriorof the cooking container and the interior ofthe 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 usmg 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 olt before the food is properly cooked.
B. Ifthe sensor has not detected the vapor ot the food, ERROR will appearand 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.) 01 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 Fleheat pad once and touch the Start pad, Now, the oven s 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 lirsl 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.
Disconnect the power supply cord, and then remove outer case cabinet.
Open the door and block it open.
. Discharge the high voltage capacitor.
. Remove the AH sensor.
. Install the new AH sensor.
Reconnect all leads removed from components during testing.
Flo-install the outer case.
Reconnect the power supply cord and check the sensor cook operation, proceed as follows:
Fill approximately 200 milliliters (7.2 oz.) ol tap water in a 1000 milliliter measuring cup.
Place the container on the center of tray in the oven cavity.
. Close the door.
Touch Reheat pad once and touch the Stan pad.
The control panel is in automatic Sensor operation.
The oven will turn ofl automatically when the water is boiling (bubbling).
It 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 lig. A) to the sensor connector of control panel.
memmemwe
mmoomy
11
zs‘flVo/meo/zs/ _
H-AGOBK
Fl-ASOBW
n—meo
OUTLlNE 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 ot 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
ANS, ANQ. AN10 and AN11 to perform the lunction that
was requested.
Control Unit
The Control unit consists of the lollowmg:
1. Synchronizing Signal Circuit
The Power source synchronizing signal is available
in order to compose a basic standard time in the
clock circuit. lt accompanies a very small error be-
cause it works on commercial frequency.
2. ACL Circuit
A circuit to generate a signal which resets the LSI to
the initial state when power is applied.
3. Buzzer Circuit
The buzzer is responsive to signals from the LSI to
13
emit Audible sounds (key touch sound and comple—
tion sound).
4. Door Sensing Switch
A switch to "tell” the LSI if the door is open or closed.
5. Relay Circuit
To drive the magnetron, tan motor, turntable motor
and oven lamp.
6. Indicator Circuit
This Circuit consists at 45 segmenets and 5 com-
mon electrodes using a liquid Crystal Display.
7. Back Light Circult
A circuit to drive the back light (Light emmitting
diodes LD‘l-LD10).
it incorporates a very small error because it works
on commercial frequency.
8. Power Source Circuit
This circun generates voltage necessary in the con-
trol unit from the AC line voltage.
In addition. the synchronizing signal is available in
orderto compose a basic standard time in the clock
circuit.
Voltage
— 5V
Application
l LSI (ICl ).
Symhol
V0
9. Absolute Humidity Sensor Circuit
This circuit detects the humidity ol the food which is
being cooked, to control automatic cooking.
//,~',f 4)»sz uy‘ _
Fir43t)BK
RAWBW
R-ABDBD
Pin No. Signal I/O Description
22 P30 OUT Signal to sound Buzzer (2.0 kHz).
01sec
A: key touch sound B: completion sound
23 P31 OUT Terminal not used.
24 P32 OUT Common data signat: COME.
Connected to LCD s|gna| COMS (Pin No. 37)
25729 P33P37 OUT Segment data signal.
Connected to LCD.
The relatlon between signals are as follows:
LSI signal (Pin No) LCD (Pin No.) LSI signal (Pin. No) LCD (Pin No.)
P33 (25) . SEG32 (38) $56 19 (57). SEG19 (19)
P34 (26). . . SEG33 (39) SEG 20 (58) . SEGZO (20)
F35 (27) .. . SEG34 (40) SEG 21 (59) . . SEGZ1 (21)
P36 (2B) , SEG35 (41) SEG 22 (60) . SEGZE (22)
P37 (29) . . ,. SEG36 (42) SEG 23 (G1) .. SEGZS (23)
SEG 1 (39) SEG1 (1) SEG 24 (62) ... , SEG24 (24)
SEG 2 (40) . SEGZ (2) SEG 25 (63) . . SEG25 (25)
SEG 3 (41) .. . SEGS (3) SEG 25 (54) . .SEGZS (26)
SEG 4 (42) .. .. SEG4 (4) SEG 27 (65) . . SEG27 (27)
SEG 5 (43) . . SEG5 (5) SEG 28 (66) . .. . . SEG28 (28)
SEG G (44) SEGB (6) SEG 29 (67) . .. . SEGES (29)
SEE 7 (45) . SEG7 (7) SEG 30 (68) .. . 856130 (30)
SEG B (46) . . SEGS (B) SEG 31 (69) .. , SEGS1 (31)
SEG 9 (47) .. SEG9 (9) SEG 32 (70) . . SEC-237 (43)
SEG 10 (4B) . SEG10 (10) SEG 33 (71) . SEG38 (44)
SEG 11 (49) . . SEG11 (11) 856 34 (72) , SEGSS (45)
SEG 12 (50) . .. SEG12 (12) SEG 35 (73) . . SEGAO (45)
SEG 13 (51) . . SEG13 (13) SEG 36 (74) . .. SEG41 (47)
SEG 14 (52) . . SEG14 (14) SEG 37 (75) . .. SEG42 (4B)
SEG 15 (53) . . SEG15 (15 81 32) SEG 38 (76) . ... SEG43 (49)
SEG 16 (54) , . SEG16 (1S) SEG 39 (77) . . . ... SEG44 (50)
SEG i7 (55) . . SEG17 (17) SEG 40 (78) ...... SEG45 (51)
SEE 18 (56) . . SEG1B (18)
30 VSS IN Power source voltage: — 5V.
VC voltage of power source voltage to drive the LSI is input to VSS terminal Connected to V0.
31-32 VL3-VL2 IN Power source voltage input terminal
Standard voltage tor LCD.
33 VL3 IN Power source voltage Input terminal
Standard voltage tor LCD. Connected to GND.
34 VCC IN Power source voltage GND (OV)
The power source voltage to drive the LSI is input to VCC terminal.
35 COM4 OUT Common data signal: COM1.
Connected to LCD signal COM1 (Fm No. 33).
36 COME OUT Common data signal: COMZ.
Connected to LCD signal COME (Pin No 34).
37 COME OUT Common data signal: coma.
Connected to LCD signal COMB (Pin No. 35).
38 COM1 OUT Common data signal: COM4.
Connected to LCD signal COM4 (Pin No. 36)
39-69 556655“ OUT Segmentdata signal
Signal Similar to P33.
70-78 SEE“ 555“ OUT Segment data signal
Signal Similar 10 F133.
79 VCC IN Power source voltage GND (DV)
Thel power source voltage to drive the LSI is input to VCC terminal.
15
/r/“}10/M //$/
R»43OBK
H-Aeoaw
aJsoaD
SERVICING
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 LSl, 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. lMQ
ti?
UCB
Transistor
Knew»
Transistor
gear as
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 sen/icing, powerto the touch control pan-
el is available either from the power line ofthe 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) ol the high voltage transformer to
turn it oft; 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. On some models, the power supply cord between the
touch control panel and the oven itself is so short that
I7
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 repairthe controls ofthe 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) cf the touch control panel with ajumper, which
brings about an operational state that is equivalent to
the oven door being closed.
As forthe 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) ol 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
(lt is recommended to use a soldering iron with a
grounding terminal.)
2. Oscilloscope: Single beam, frequency range:
DC-lOMHz type or more advanced model.
3. Hand tools.
Other Precautions
1. Before turning on the power source ofthe control unit,
removethe aluminum foil applied lorpreventing 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 aluminum foil is removed, be careful that abnor-
mal voltage due to static electricity etc. is not applied
to the input or output terminals.
4. Attach connectors, electrolytic capacitors, etc. to
PWE, making sure that all connections are tight.
5. Be sure to use specified components where high pre-
cision is required.
Myflmm/Jg/ -
R—MDEK
fi-daDEW
RetGDED
ABSOLUTE HUMIDITY SENSOR CIRCUIT
Structure of Absolute Humidity Sensor
The absolute humidity sensor includes two thermistors
“as shown in the illustration. One thermistor is housed in
the closed vessel filled with dry air while another is in an
open vessel, Each sensor is provided with a protective
cover made of metal to protect it from the external air-
flow. The open vessel cover has two small holes in it to
allow moisture laden air from the oven cavity to surround
it.
Themlflcm
Sensing part
we“ Wise” Sehsmg part
lCInSld vmeii
Ventilation openings iorsensmg
Operational Principle of AH Sensor
The figure below shows the basic structure of an abso-
lute humidity sensor. A bridge circuit is tormed by two
thermistors and two resistors (R1 and R2).
The output of the bridge circuit is amplified by an opera-
tional amplifier.
Each thermistor is supplied with a current to keep it
heated to about 150° C (302° F) and the resultant heat
is dissipated in the air. it the two thermistors are placed
in different humidity conditions they show different hu—
midity conditions and different degrees of heat conduc-
tivity leading to a potential difference between them
causing an output voltage from the bridge circuit, the in-
tensity of which is increased as the absolute humidity of
the air increases. Since the output is very minute, it is
amplified by the operational amplilier.
Over-"ml mam, man vs
\ Amplifier m
c A a ma ulvolta echaracterlstic
>' 7,” Output ET p g
j) , , voltage §
t > — .
s‘ 2 '
fine , / é \
l / °
«- 5, fhoirnislor
R3 open vessel \\\,
is .. 0 7mm ,7, ——>
mm mm, Amine human (gnu)
Detector Circuit of AH Sensor Circuit
This detector circuit is used to detect the output voltage
oithe absolute humidity circuit to allow the LSI to control
[9
the sensor cooking of the unit.
Whenthe unit is set in the sensorcooking mode, 16 sec-
onds later the detector circuit starts to function and the
LSI observes the initial voltage available at its AN1 ter-
minal. With this voltage given, the switches SWt to
SW5 in the LSI are turned on in such away as to change
the resistance values in parallel with R1077R111 of ICZ.
Changing the resistance values results in that there is
the same potential at both the F-3 terminal of the abso—
lute humidity sensor and the AND terminal of the LSI.
The voltage of AN1 terminal will indicate about »2.5V.
This initial balancing is set up about 16 seconds after the
unit is put in the Sensor Cooking mode.
As the sensor cooking proceeds, the food is heated to
generate moisture by which the resistance balance of
the bridge circuit is deviated to increase the voltage
available at the AN1 terminal of the LSl. Then the LSI
observes that voltage at AN1 terminal and compares it
wlth its initial value. When the comparison rate reaches
the preset value (fixed for each menu to be cooked). the
LSI caused the unit to stop sensor cocking; thereafter,
the unit goes into the next operation automatically.
When the LSI starts to detect the initial voltage at AN1
terminal 16 seconds after the unit has been put in the
Sensor Cooking mode, if it is impossible to take a bal-
ance of the bridge circuit due to disconnection ofthe ab-
solute humidity sensor, ERROR will reappearon the dis-
play and cooking is stopped.
Absolute Humidity Sensor Circuit
niur 52°“ 9 an em
, '—ifi=io
“105 30°“! swz
——~ P‘f‘f 4
l 52 avg—”L
~ r—«i— 912m
53 SWA
Pram
sws' ,
WHY/cl ‘
slfi
AND
LSI
00100qu DDqu (lCll
>ANi
s» Thermistorovonvssiel
V2 6" c. rnsiniittoicieunmsei
Va,-|5V
Vaz—tsv
”fit/arm U y -
R4305K
R~4305w
FMSBBD
AH SENSOR ORIENTATION & HARNESS ROUTING
Figure 1-16
Oven Left Side View
Figure 2-16
Oven Top View
21
”Pram/Ea // /
R—ASDEK
R-MDEW
EMBED
I I
|.I
A a c n s s e u
‘ “‘\w“ w w 1 ‘ \ w ‘ ‘ 1 w 7
a? 735.5 as s 33.5" x is 7302 957 E 7772. as 5; EEE .w
5 q £295 £2723 77572777273757573Eziuifixfig773777772 m
7 3. 2 3.77777; 59:33725x22§=5=28§a7§u .
e aa 5 as25313735...2732—828372....z,u§ms_m=7§su§>_aa_§a m
i % \ l 438 telecoms-5325 3.3 7,73 2.5 57775 25.75 88578 077; N
“M an 3778 5273355557555“, _
7 i E ‘ 5; 7x; "mm-E. \
i E 5 in E, 5
2:5 977777773; 2725
|!; 1875
5x5 5.8 5952.
3.97 Eézoomm
57 14 \ ‘ ‘ 4 ,4\\ 1; 5
7 is 7 7x: 5? 70.1 E;
7 7
foo , EEEQ 7
7 zzc E7 7 ‘ w
Scam
197205 7 i,
\ \\ \ / \ //
.o.z 557m 5 7 SE 7 5
955m f/ f/ \ \ 7 7
a 7 108 is: 7 4
t o 7 93 7
a: / Q1 1\&“ Hrcxo‘ 95
oz mmE
7 use
figawa 7 >t>fi M v : zma l7 7
7” V7 , , 7 7 , _ aT/j
7 7 \ c 7.855. 7 / 7
7 7 7 7 a J. 7755.5. “““ / in v 7
® 77 Ni. 7 / 7 7 w
10.6575 7 7M W ;
>x 55mm ta 7 F 2
7 7
z 7 mm 72
7 7 T‘ _ a
7 _
7 , 4 9. o 58 7
Ex 7 7
W 7 7 7
L Q\ in 75 7
7 2577 5; “we
7 as? 197207: 1
‘ zofingz
59:70:00 =O xooo fimeU Eon
f ‘ w ‘ ‘ ‘1 ‘\el 1; lwli 1 w ‘ . ‘ ‘1 ‘ 7
A a c n 7.7 r 7 G N
23
FMSOBK
R-4308W
H~4305D
1 L 2 7 1 a A 4777 77 5 4L 5
A1 A
,, cw LED
i 02 2531235
a ‘ T1 . ”EST D5 06 R5427K a
ACTZOV A1 . m m 01 VA
GDHz ]
4 g > T- > 02 GND f
g; s I
A2 ”V. B“ D? 3 c ':3 gpca vc
.3 E c -8 «a —.. Q
. f — n Q _ C
° a b 1 0 8 U 0 fig
1 ’ EE—
‘ % 2531233 ‘
—Al\lv—‘
, N R26801/2w *
2T 04 INT
‘ w
i l - ole VR ‘
i C RYT 4—1[I cs BUZZER
ow TURNTABLE No SP1 D
‘ MOTOR ' ' 6 1
OVEN LAMP — D7
FAN
MOTOR COM ‘ T TURNTABLE
MOTOR
‘ 0sz LAMP
\ FAN
MOTOR
E 03 KRC243M ‘ E
RY2
N.o
MICRO ‘
MICRO
N‘C
NOTE W : IF NOT SPECIFIED, 1/4w1 5%
——-—N— : IF NOT SPECIHED‘ 188270A
Power Unit Circuil
¥ ,, , l W, 7—7, 77, V,
25
,‘/‘/'/L~////r¢ p y
FMSOBK
H-ABOBW
n-AaoBD
OEHWQZOSdLIMD
m,
RY1 0L FM
Z3- Um I) ‘3
Printed Wiring Board 01 Power Unit
' 2 ' 5 T" ’
27
”WM/Mr —
R43BEK
23585}?
Ref No. Part No. 5 Description Qty Code
Control Panel
371 {cpwsFEdllmuu M Control unit 7 7 l 1 BK
3—1A ‘QCNCMAMGDREG J iz-pin connector (cNeA) l 1 AD
3—13 QCNCMA275DREU J 2-pin connector (CNfB) 1 AB
3elc iFwwzeiAéMkEo ‘ M Lead wire harness (WK—1) 1 1 AC
Cl RCiKZA087DREO J Capacltor 0.1HF 50V ‘ 1 AB
cz vcerzlgfiloeM J Cspeeitor lDDDpF 35V 1 Au
C3 RC7K2A037DREO J Capacitor DtluF 50V 1 AB
CA’S VCEAB31VWlDEM‘ J Capacitor IOHF 35V 2 RB
01—4 ‘w-mllEsl/u—l J Diode (1113le 4 AB
[15-8 w-mlsssz—l J Diode [15527OA) 4 AA
Ql-QZ vszssuzsN—a J Transistor (2531233) A 2 AA
Q3 VSKRC243MH—3 ‘ J Transistor [mound] 1 1 AB
R1 ‘VRDeBl2EF242J J Resistor 2 Qle/Avl 1 AA
R2 VRD—BI2HF681J J Resistor 6809 l/;w 1 AA
R3 VRDeBlZHFsllJ i J Resistor 5109 l/2w 1 AB
R4 ‘vRD7B12EF27DJ J ResiStDri 7 2791/45] 1 1 AA
R5 ‘vRD—El2EF472J J Resistor 4.7k9 1“w 1 AA
R5 VRD—BlzaFazzJ J ‘Resistor 3.3kQ ‘uw ‘1 1 AA
RYZ—l ‘RRLYsBDD2MREO M Relay (mum—19mm 2 AH
SP1 RALM7A014DRE0 ‘ J Buzzer (PKMZZEFT) 1 AG
T1 7 RTRNPBOGQMREO - M Transforms: 7 ’ 1 AN
VRS] RH»VZA032DRE0 ‘ J Verister 1104G471x> 1 AE
ZDl ‘VHEHZ151///—1 J Zener dlcde (HZIS’l) 1 AA
372 LHLD’BOGSMRFD M LCD holder 1 1 AC
3-3 ‘FPNLCBZOEMRKD M Control panel assembly (124130510 1 ‘ Ax
FPNLcngMRxohM Control panel assembly (ReAlDEm 1 AX
FPNLCEZOBMRKO M Control panel assembly (xx-43013111 1 Ax
3,4 FUNTKElS4MREU M Key unit 1R74ZUBK) ‘ 1 AR
FUNTKBlSSMREU M Key unit 1R»430EW) 1 AR
FU'NTKEI5GMREG M ‘Key unit {R74BOBD) 1 AR
375 ‘JETIW—E070M'RFO M ‘Open Button W {R’4308K) 1 AE
3’5 JBTN7E071MRFO M Open Button (R’43OBW) 1 AB
345 JETN’BO72MRFO M Open Button (Rm/130313) 1 AB
376 1MSPRTAOSDWREQ M Button Spring A 1 ‘ AA
377 ‘PSHEPA626W'REO M LED sheet 1 AR
3—8 XEPSD3OP10XSO M Screw; Central unit ml 1 AA
29
Cavity Assembly
3]
z:
1 2 3 4
Wire Harnesses
‘Mmai hamsuss may he dmsmm man musllahws
Packing and Accessories
wan moms}
s mm m
52 u,»
/\\
5 OPEflATION MANUAL
1“
,2 1 3x ‘ TURNTABLE syppom
///
~ mama pass
~ Nan vepwacezme dams
‘ I g 3 4
~ FACKWG m
33
R-mEK
1-1-mb
R—4SUED
SHARE
‘98© SHARP CORP. (3M2.70E) MM
R—taoBK
R-oaflBw
R4SOBD
”Pl/1) ”EON“
| 2
Control Panel Assembly
Dog:- VAssembIVy , 7
372 ‘/
32
— fl,
meow
macaw
mam
Ref No. Part No. 1 5 Description 1 Qty Code
Door
4- D CDORFBZI7MRKO M ‘Door assembly (ll—43051“ 1 as
4— o CDORFBZISMRKO M Door assembly (R-4JOBW) 1 BE
4— U CDORFBZI5MRKO M Door assembly (la-410513) 1 BE
4— 1 Fcov—BllsMRKo M iDoar screen assembly menu“) 1 i As
47 1 FCDVABIIEMRKD M Door screen assembly (Rename) 1 As
4- 1 Fcov—Ell7MRK0 M Door screen assembly (1274301313) 1 As
A 4, 2 FDORFBOGZMRTO M Door panel 1 Aw
4— 3 PSHEPBO21MREO M Sealer film 1 As
4» 4 GCOVHBOBdMRFO M Choke cover 1 As
A Ar 5 LSTPPBO21MRFO M Latch head 1 1 A13
47 a MSPRTAOAEWRED 7 M ‘Latch spring 1 AB
4, 7 HPNL-EO77MZREO M Door Screen AR—ASOBK) 1 AK
4— 7 MPNL—Bcwmm M Door Screen (R-Azon/R—uuem 1 1 AK
Miscellaneous
5— 1 TCAUAB015MRRO j M Monitor caution label 1 AA
5— 2 TCAUA13027MRR0 ‘ M DHHS caution label 1 1 AB
5— 3 TCAUAB033MSRRO ‘ M UL SCREW label 1 7 AA
5— 4 TLAB—Bo33mo M Menu label 1 AA
5— 5 TINSEBIBOMRRO M Operation manual 1 AE
Fasteners
s- l LX—BZADdleED 1 M Screw; Ease plate mtg. 3 AA
of 2 Lx—cz0052wm-zu { M Screw,- Latch hook mtgr a An sensor duct mtg. 3 AA
6— 3 XHTSD40P12RVG 1 M Screw: Power cord mtg. 1 AA
or 4 Lx—szoosuezu M Screw; I'LVY Capacitor mtg.s. Magnetron mtg. 5 AA
6— 5 xomsmomzoou M Screw,- power transformer mte, chassis support A 12 1 AA
Base plate.
5— s xcpsmoposooo M Screw; TAT. Motor mtg. & AH sensor mtg, 4 AA
6- 7 r xCBSDmPGBOOG M Screw, Temperature fuse rug 2 ‘ RA
67 s XHTSDADPOBDDG M Screw,- Magnetron duct mtgi 2 ‘ AA
5— 9 LX‘CZAO38WREO M Screw; (LC. Cabinet grndt 2 AA
5411) J XHTSDAOPGBRVG M Screw; Fan motor mg, 2 AA
6—11 1 Lx—czmlnflzEu M Screw; UL o.c. Cabinet 2 7 AA
— mew/w
MM
RASGBD
PARTS LIST
Contact your nearest SHARP Pans Distributor to order. ,
For Iocafion of SHARP Pans Dwsln'buior, Please can Ton-Free;
1-600-BE-SHARP
Ref No. Part No. 5 Description \ Qty Code
Electrical
' 1, 1 RchzecmM-REO M 1-1.v. aging; 77777777 7 7 1 AQ
. 17 2 FH~DZBOOEMRYU M 1-1.v, Diode assembly 1 AM
17 3 QSDCLEDDGMRED M ‘oven lamp socket 1 A}:
1» 4 RLMpTAossvmso M Oven lamp 1 AE
1~ 5 RMDTEAsasWREU M Fan motor 1 AR
17 Z QFsHDBouzMMEo M FMse mock 7 7 77 71 AD
17 7 FFS»BAD16/KIT M iMonltor sw1tch (V716G72C25) & Fuse assembly 1 AF
120A7250VAC)
ls s QSW~MA110WREO M Sec. interlock & Door sensing switch (V716G73C25) 2 AB
1, 9 QFS~TBDDGMREO M Temperature fuss (144°C) 2 AF
' A 1710 RstiAQSSWREO M-Maonetxon 7 W 71 7 BE
1711 RMOTDA182/KIT M 3LT, Motor 1 ‘ AP
«r 1—12 RTRN—BOSOMREO M ‘Power transformer 1 EF
1713 FACCDEOO3MREO ‘M Power cord 1 AM
. 1714 QstZBc1sMREO M H.v, wire A (Transformer 1 Capacltor] ‘ 1 Ac
71-175 Fwsvza147mz130 M ‘rMain wire harness 7 7 7 1 AU
1715 FW—VZBIZSMREO M Stop switch harness 1 A}?
1—17 FDTCTA177WRKO M AH sensor 1 1 AQ
Oven
727 1 LewfixsomMan 7M H.V Capacitoriband 7 71 AB
2, 2 LANGTEO2EMRPD M chassis support 1 AF
A 27 3 PHDK—BOIBMRFD M Latch book 1 AG
27 4 1 GDAI—BOSDMRPO ‘M Ease plate 1 1 AQ
2» 5 ‘ GLEGPBOUSMRFD M 1Foot 4 AA
2— 6 VMLEVPBOISMRFO M lLatchrlevVer 77 1 ‘ AD _
2— 7 PDUCVB073MRP0 M Magnetron duct 1 AF
2v 8 NFANPBOOIMRED M Fan blade 1 AC
27 9 PDUCsBDuMRFo M Fan duct 1 AD
A 2~1o — - Oven csVisy (N a rep1oceab1e pggg) 1 -
2711 pcovpammgpfi M‘Mlaveguléé cove: W W 7 1 AD
2—12 GCABUBOBZMRPD M Outer case cabinet (R-43OBK) 1 Av
GCABUBDS8MRPOA M Outer case cabinet kR—ABDBW) 1 Av
GCAEUBOSIMRPOA M 1Outer case cabinet 111430513» 1 1 Av
21} ‘ FROLpEozaMRKo M ‘Trp. Roller ssssmmy 1 AK
2—14 NTNT-AOQSWREO M ‘T4Ti Tray 1 AM
2715 PPACGE014MRFO M 1.1". Motor packing 1 AA
”72-15 ‘ pcbscsoazMRpu M7 Base plate Cosmo; 1 1 77
2—17 PDUC—EU74MRPG M ‘AH Sensor duct 1 AP
2713 PCUSUBQAZMRPU M Air flow cushion 2 AA
2719 PCUSGBOZEMRPD M icavity cushion 1 AA
28
FHSOBK
R-4aosw
H~4SOBD
A s , c D E F G H
55.5 _w:wn_ 3:55
5.58
$5.8
539 g ,
59mm x.
$530 a“
35m
5155
so SE:
A, = ,_ 2:5
3 E E ‘
J, 9.
. \_ 55: z:
55:
1x Gm): a Ru 55512
. ‘ £25
9 ‘ u ., £33; $9.2.
S 5,
as a;
a; x,
3; Es;
a)
29:5 ,\
an
EEE
22:5
3 5
ea
2.55 SEE". Ea:
A a , c u E r , G g: i‘l n
26
24
- ”WW”
W c 1 W E ‘ wlwl : W ‘ w a H
. “““““““““““““““ \ “““““ EEmmE mczzs 25g is Egg?
W WWWS 52a 5 5m $2.5 . 2 85.5.8 3 E,
5.5 11 nut “20
210 W its
\ W 3:
W 35:26
2 W W 5
{a} W W
W W .
W {i L
W gowa ‘ W 1 W
W. a W .. W.
E E W
AW /I\ 8:29: W 58 o
W 35: 85 , W ES W, 55m
W W fl E a as: W
W EWWW 51 W
\ WV; W
nwxW
asses
sis? W3: 56
W 55 W
‘ 21 2x0 ‘
W ‘ J 53m
$52
ER. Gem 7
1sz V 1 o W 2
z E msWSu W 1 a WWW W
010 QM: C;
;em 5;
W E } i WJZW W ‘
{W ) EW WL
W E
We a is (L
We OK,“ W a: 5.st ego W5
[/ W @ Sm, W} W ‘
1 W W 1 WW \ WJHW
W 55s 35.5: i/ w SW... S / ‘
W 7
W \‘\: “J{ F ‘ “ 1 6 H
A E
FMaon
R-mBK
FivSUED
- flP/D/v/éw/V
H-AaoBK
Hemoaw
a-aaoED
MICROWAVE MEASUREMENT PROCEDURE
After adjustment of the door, interlock and monitor
switches are completed individually or collectively, a IN~
TEFlLOCK SWITCH TEST and MICROWAVE LEAK-
AGE TEST must be performed to assure compliance
with DHHS (CDFtH) Pertormance Standards for Micro-
wave Ovens.
Interlock Switch Test
Make sure that the door sensing switch, secondary in»
terlock switch and monitorswitch are operating properly
by checking with an ohmmeter.
Referto the “Test Procedure" of the door sensing switch,
secondary interlock swttch and monitor switch.
Microwave Leakage Test
Requirements
‘l.
Microwave leakage limit (Power density limit).
The power density of microwave radiation emitted by
a microwave oven shall not exceed 1mW/cm2 at any
point 5cm or more from the extemal surface of the
oven, measured priorto acquisition by the purchaser,
and thereafter (through the uselul life ol the oven)
5mW/cm2 at any point 5cm or more from the external
surface 01 the oven.
. Safety interlock switches.
Primary interlock relay and door sensing switch Wlli
prevent microwave radiation emissions in excess of
the requirement as above mentioned, secondary
interlock switch shall prevent microwave radiation
emission in excess of 5rnW/cm2 at any point 5cm
or more from the external surlace ol the oven.
Preparation For Testing
Before beginning the actual measurement of leakage,
proceed as lollows:
1 .
Make sure that the actual instrument is operating nor-
mally as specified in its instruction booklet.
Note: Survey instruments that comply with the require-
mentfor instrumentation 21 CFR1030.10(c)(3)(i),
as prescribed by the performance standard for
microwave ovens must be used for testing.
22
2. Place the oven tray in the oven cavity.
3. Place the load of 275 t15ml (9.8 oz.) oftap water ini-
tially at 20 t 5°C (68°F) in the center of the oven cav-
ity.
The water container shall be a low form of 600 ml (20
oz.) beaker with an inside diameter ol approximately
8.5 cm (3 1/z in.) and made 01 an electrically noncon-
ductive material such as glass or plastic.
The placing ol this standard load in the oven is impor~
tant notonlyto protectthe oven, but also to insurethat
any leakage is measured accurately.
4. Set the cooking control on High.
5. Close the door and put the oven into a cook cycle for
several minutes. It the water begins to boil before the
survey is completed, replace it with 275ml of cool wa-
ter.
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 tin/sec
(2.50m/sec.) along the gap, watching for the maxi-
mum indication ol the meter.
3. Check tor leakage at the door screen, sheet metal
seams and other accessible positions where the con-
tinuity of the metal has been breached (eg,, around
switches, indicator and vents).
While testing lor leakage around the door pull the
door away from the front of the oven as tar as is per—
mitted by the closed latch assembly.
4. Measure carefully at the point of the highest leakage
and make sure that the highest leakage is no greater
than 4 mW/cm2to allow for measurement uncertainty.
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.
- ”Women/w
Fl-43OBK
H-mb
1143050
AH SENSOR DUCT REMOVAL
1. Disconnect the power supply cord. 7. Slide the two tabs of the sensor duct to the right.
2. Open the oven door and block it open.
3. Remove screws from the rear of the outercase cabi-
net. Slide the entire case back about 1 inch (3cm) to
free it trom retaining clips on the cavity faceplate.
4_ Discharge the high voltage capacitor. Discharge the high voltage capacitor before touching
. any oven components or wiring.
5. Lth entire outer case cabinet lrom unit.
8. Sensor duct is now free.
6, Remove ground screw mounted into the sensor
duct
Sensor Ground
screw
‘ Slide
SensorDuct .
AH SENSOR REPLACEMENT
Removal Installation
1. Disconnect power supply cord . 1. insert new AH sensor into AH sensor duct.
2. Open the oven door and block it open. Refer to Figures 1-16 & 2—16 for proper sensor
orientation.
3. Remove screws from the rear of the outercase cabi-
net. Slide the entire case back about 1 inch (3am) to 2. Install two (2) screws to secure AH sensor.
free it from retaining clips on the cawty faceplate, 3» Route the AH sensor harness above emboss on AH
4. Lift the entire outercase cabinet trom the oven unit. sensor duct.
Refer to Figures 1-16 & 2-16.
4. Continue to route AH sensor harness across the
oven cavity top plate and through the large opening.
Refer to Figure 2-16.
5. Connect AH sensor harness to CN-F on the control
unit.
5. Discharge high voltage capacitor.
6. Remove two (2) screws holding the AH sensor
Reier to Figures 1-16 & 2-16.
7. Disconnect the AH sensor harness from connector
CN-F on control unit.
8' AH sensor ‘S now free. 6. Re—install the outercase cabinet and check for prop-
er operation.
20
_ ”fr/meow
H-ASOBK
HASOBW
neazoeo
COMPONENT REPLACEMENT/ADJUSTMENT PROCEDURE
WARNING AGAINST HIGH VOLTAGE
Microwave ovens contain circuitry capable of producing very high voltage and current, contact with the following
parts may result in severe, possibly fatal, electric shock,
Example
High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness
etc.
WARNING Avoid possible exposure to microwave energy. Please follow the
instructions below before operating the oven.
1. Disconnect the power supply cord. 5. There are defective parts in the door interlock sys—
2. Visually check the door and cavity face plate for tem.
damage (dents, cracks, signs of arcing etc.). 6. There are defective parts in the microwave gener-
Carry out any remedial work that is necessary before ating and transmission assembly.
operating the oven. 7. There is Visible damage to the oven.
Do not operate the oven if any of the following condi-
tions exist; Do not operate the oven:
1, Door does not close firmly. 1, Without the RF gasket (Magnetron).
2- DOO" hlngei support 0" latch “00k IS damaged. 2. It the wave guide or oven cavity are not intact.
3. The door gasket or seal is damaged. 3. If the door is not closed.
4. The door is bent or warped. 4. If the outer case cabinet is not fitted.
WARNING FOR WIRING
er and oven cavity.
To prevent electric shock, take the following pre-
cautions. 3) Sharp edge:
1. Before wiring. Bottom plate, oven caVity, waveguide, flange,
1) Disconnect the power supply cord. chassis support and other metallic plate.
2) Open the door and btock it open. 4) MoVable parts (to prevent a fault)
3) Discharge the high voltage capacitor and wait for Fan blade, Fan mowr. SWlICh . SWltCh lever, and
60 seconds. Open button
3. Do not catch the wire leads in the outercase cabi-
2 Don’t let the wire leads touch the followmg parts: net.
I) ngh voltage parts: 4. insert the positive lock connector until its pin is
Magnetron, High voltage Transformer, High volt- looked and make sure that the wire leads do not
599 5995010" and ngh VOIIGQE rectifier assembly. come off even if the wire leads are pulled.
2) Hot pans: 5. To prevent an error function, connect the wire leads
Oven lamp, Magnetron, High voltage Transform- correctly, referring to the Wiring Diagram.
l8
— ”MW/“W
naeoeK
Macaw
eesneb
Pin No. Signal IIO Description
8054 P10P14 OUT Used for Initial balancing ol the bridge circuit (absolute humidlty sensor).
85-56 Pl 5-P16 OUT Terminal not used.
87 F17 OUT Oven lamp, ten motor and turntable motor driving signal.
To turn on and oft shut olf relay RY1. The square waveform voltage is delivered to the RV~1
driving CIrCUll and HY—E control CllCUlL
15 7 meal:
,,7 , ,,,,, H
i i F l l .
1 Wing cm.“ 1
u ,,, 7, 7 . . 74,
88-89 P40~P41 OUT Terminal not used.
90 P42 OUT Magnetron nigh-voltage circuit driving signal.
To turn on and all cook relay RY2. ln high operation, the signals holds “H" level during micro-
wave cooking and "L" level while not cooking. ln other cooking modes (variable cooking) the
signal tums to “H“ level and "L" level In repetition according to the power level.
7" """ ' ' H GND
P—Hl
i ON 7 ,77 Lffiv
if A“ t. m
P m 24 sec l
< fl ,_
emu; , 8 see I; I. «SV
91 IROO lN Signal synchronized with commercial power source frequency.
This is the basic timing tor time processing at LSI.
/ ~\ H m
l 4’
. 15.7 me .
F "7" f
92 AVCC IN AID converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to GND,
93 ANU lN Used for Initial balancing olthe bridge circuit (absolute numieitysensor). This input is an analog
7 input terminal train the AH sensor circuit, and connected to the A/D converter built into the LSI.
94 AN1 lN AH Sensor Input.
This is an analog inputterminalirom the AH sensorcircuit and is connected totheA/D converter
7 77 7 builtintothe LSI 7 7 ,. 4 7M?
95 AN2 IN To Input signal which communicates the door open/close intormation to the le.
Door closed; “H“ level signal (OV).
Door opened “L" level signal (—5V).
96 ANS OUT Terminal not used.
97-100 AN4-AN7 IN Terminal to change tunctione according to the Model.
By using the AID converter contained in the LSI, DC voltage ln accordance with the Model in
operation is applied to set up its cooking constant.
I6
— Afl/flmaf/V
HVMBK
Ft-itaosw
R-ASOED
DESCRIPTION OF LSI
The I/O signals 01 the LSl (lZA866DFt) is detailed in the loIIoWing table.
Pin No.
Signal
Description
ANB
Signal coming from touch-key.
When either (5—12 line on key matrix is touched. a corresponding signal out of P20AP27 will be
input into ANS. When no key is touched. the signal is held at “H" level.
ANS
Signal similar to ANS.
When either G 11 line on key matrix is touched, a corresponding signal will be inputted into AN9.
AN1O
Signal similar to ANB.
When either 610 line on key matrix is touched, a corresponding signal will be inputted into
AN10.
AN11
Signal similar to ANS.
When either GS line on key matrix is touched, a corresponding signal will be inputted into AN11.
oi
AVSS
7 TEgT
AID converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to V0,
Connected ich.
X2
X2
Terminal not used.
éonnected to GND?
(D mlxi o>l
VSS
Power source voltage: — 511.
Vt: voltage oi power source voltage to drive the LSI is input to yes terminal. Connected to V0.
10
OSC1
Internal clock oscillation irequency setting input.
The internal clock lreouency is set by applying the ceramic filter oscillatior circuit with respect
to 0801 terminal.
11
OSC2
Internal clock oscillation frequency control output.
Output to control oscillation input of 0802.
12
13
RESET
Tvioo ’
IN
Auto-clear terminal.
Signal is input to reset the LSl to the initial state when power is supplied. Temporarily set to
“L" level the moment power is supplied, at this time the LSI is reset. Thereafter set at “H" level,
Eonnected tierGND.
14
P20
OUT
Key strobe signal.
Signal applied to touch—key section. A pulse signal is inputted to ANB - AN11 terminal while
one ol GB line keys on key matrix is touched.
15
P21
OUT
Key strobe signal.
Signal applied to touch—key section. A pulse signal is inputted to ANE - AN11 terminal while
one or G7 line keys on key matrix is touched.
16
P22
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is inputted to ANB ~ AN11 terminal while
one of G6 line keys on key matrix is touched.
17
P23
OUT
Key strobe signal.
Signal applied to touch-key section A pulse signal is inputted to ANS - AN11 terminal while
one oi GS line keys on key matrix is touched.
1B
924
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is inputted to ANE - AN11 terminal while
one oi G4 line keys on key matrix is touched.
19
P25
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is inputted to ANB - AN11 terminal while
one 01 63 line keys on key matrix is touched
20
P26
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse Signal is inputted to AME - AN11 terminal while
one at G2 line keys on key matrix is touched.
21
P27
OUT
Key strobe signal.
Signal applied to touch-key section. A pulse signal is inputted to AN8 - AN11 terminal while
one oi G1 line keys on key matrix is touched.
l4
— MW w
Ft-A‘GDBK
R-4GOBW
H4SOED
TEST PROCEDURES
Procedure Letter Component Test
L. Checking the Control Unit (Continued)
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, re-connect the power supply oord,
9. Check the sensor cook operation proceed as follows“
Touch FlEHEAT pad once and touch Start pad.
The control panel is in the sensor cooking operation.
After approximately 20 seconds, push plunger of select switch for more than 3 seconds. This
condition is the same as judgment by AH sensor.
After approxnmately 3 seconds, the display shows “XX, XX" which is the remaining cooking
time, and the display counts down,
ll the above is not the case. the control unit is probably defective.
If the above checks positive, the AH sensor is probably defective.
10,Disconnect the power supply cord, and then remove outer case cabinet.
“Open the door and block it open.
12.Discharge the high voitage capacitor.
13.Disconnect the dummy reSistor circuit from the sensor connector of control panel.
14.Carry out the necessary repair.
15.Reconnect all leads removed from components during testmg and repairing.
16.Fle-install the outer case cabinet.
17. Reconnect the power supply cord after the outercase is instalied. Fiun the oven and check all func-
tions.
1B.Carry out the “Water load cooking test" again and ensure that the oven works properly.
.0 0m.»
moonnscron tr)
on CONTROL uNir
cowscron
m wart?! —1
m cmszs w
”<7 sign? .. m
R1, R2 2m11%1/2W
H3. 4,3kfl i 5%1/4W
R4 iMfl i 5% 1/4W
Figure A, Sensor Dummy Resistor Circuit
12
— mew
R-ASOBK
R—AGOBW
H-ASOBD
TEST PROCEDURES
Procedure Letter Component Test
J Compu Defrost Test
1. Place one cup at water in the center of the turntable tray in the oven cavity.
2. Close the door, touch the “COMPU DEFFlOST" pad once and touch the number pad “1 ". 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 i 7 1st stage 2nd 959? 7 379,5“92 , 4th Stage
1 L Time vael Time Level 7 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
. Disconnect the power supply cord, and then remove outer case cabinet.
. Open the door and block it open.
. Discharge the high voltage capacitor.
. It the display fails to clear when the STOP/CLEAR pad is depressed, lirst 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 shon 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 beepthe key unit is faulty and must be replaced. it the control unitdoes
not respond, it is faulty and must be replacedlf aspeciiic pad does not respond, the above method
may be used (after clearing the control unit) to determine it the control unit or pad is at lault.
. Reconnect all leads removed from components during testing.
. Fte-install the outer case cabinet.
. Reconnect the power supply cord after installing the outer case cabinet
, Run the oven and check all functions.
helm-A
ooximur
GB G7 G5 G5 G4 (33 62 G1
1 CHMDM
l 55 5 4 l 3 2 1 Reheat P°P°°m Help
t 4 — fl ‘ ‘ — »
o Baked t Fresh KITCHEN
5 9 8 7 6 potato veaetablss TIMER
,, Minute Compu Fisn/ Frozen 5mm,” POWER
" Plus Delrosl seafood ve etables Poultry meat LEVEL
0 9
N Start Frozen Beverage Cum u Frozen flan
‘ 5 Wire on C'm snacks center l H'Ce CD01 main dish Clear
KEY UNIT
10
— mom/w
PMSOBK
RAMBW
Fi-KiOED
TEST PROCEDURES
Procedure Letter Component Test
G. Touch Control Panel Assembly Test (Continued)
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. Pie-install the outercase cabinet.
6. Reconnect the power supply cord alter 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.
. Open the door and block it open.
. Discharge the high voltage capacitor.
. Disconnect the leads to the primary oi the power transtormer.
. Ensure that the leads remain isolated from other components and oven chassis by using insulated
tape.
. After the above procedure . reconnect the powersupply cord.
. Check voltage between Pin No. 1 ol the 2 pin connector (A) and the common terminal of the relay
Hill on the control unit with A.C. voltmeter. The meter should indicate 120volts. It not, check oven
circuit.
RV~1 and RY-Z Ftelay Test
These relays are operated by 0.0. 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 detective.
who)»
MO)
Relay symbol Operational Voltage Connected Components
FlY 1 7 Approxiga 3 V DC 7 >Oven lamp/Turntable motor/Cooling tan motor
RY 2 Approx. 23.5 V DC 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 Reinstall the outer case cabinet.
13. Reconnect the power supply cord after installing the outer case cabinet.
14,Ftun the oven and check all functions.
Foil pattern on the printed wiring board Test
To protect the electronic circuits, this model is provided with a fine toil pattern added to the primary
on the PWB, which acts as a fuse.
i 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 tor repair.
Steps l Occurrence
1 ‘Only pattern at 7
2 Pattern at “a“ and “p" are broken ‘ Insert the coil RCILFZODEYAZZ between “c" and “d".
7 Pause or Correction
5 broken. ' Insert jumper WireJ‘l and solder.
SERVICING
When troubleshooting the microwave oven, it is helplul to follow the sequence of operation in performing the checks.
Many of the possible causes of trouble Will require that a specific test be pertormed. These tests are given a procedure
letter which will be found in the “Test Procedure” section
Belore replacing a blown monitortuse, test the doorsensing switch. primary interlock relay, sec-
|MPORTA NT ! oridary interlock switch and monitor swnch lorproperoperation. (Relerto "Test Procedure" sec-
tion )
IMPORTANT ’
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,
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 lrom other components and oven chassis by using insulated tape,
After the above procedure install the outer case cabinet. reconnect the power supply cord.
hen the testing is completed
Dlsconnect the power supply cord, and then remove outer case
Open the door and block it open.
Discharge the high voltage capacitor.
Reconnect the leads to the primaw ot the power translormer.
Pie-install the outer case (cabinet).
Reconnect the power supply cord after the outer case is installed.
Run the oven and check all lunctions.
NF’F-“§>“’.N."E F’SJ‘FPNT‘
Troubleshooting Guide
,, 7 Sensor Cooking 90ndilion W ,,
Problem ‘ Possible Cause ; Test Procedure
The oven is in the sensor cooking Control Unit lProcedure G
condition butAH sensor does not end
or AH sensor turns off about a maxi-
mum 0130 minutes after start.
When a cup of water is heated by
sensor, the oven does not shut off
when the water is boiling.
rAH Sensor 7 iProoedure L
Anyomflouk/
74
Fl 743050
Key Unit Layout
3. Indicators.
b. Lighted d|g|tal display.
c. Custom Help
Features user lrlendly communicatmns during
cooking procedure.
cl 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 (0 increase cook- 1
“gm“ ‘ IWI WI IWI WI IWI WI WI /'\
'— 0m“ M pad- ‘ I'TII Iii ' Ki Iii m Iii Ifil K 2
Touch to cook cenainloods I _— : _— _—_— — — f
g. Compu Delrostpad. . IIII I!II\_III I\1I MI cgm a}
Touch ta deirost certain loads. ‘ |/_II| I|A|I/_III I/_III |A| m 4/
h. Number selection pads. ‘
l. Power Level pad. Touch to select more»
wave power semng I
1 Clock pad . .f \I
Touchtosetclock l Custom Help ‘\f/
k. Beverage Center pad.
Touch to Reheat certain beverages. 1 S E II 5 Q B C 0 O K I N G (in)
l. Slop/Clearpad. I \ ,/
Touch to erase during programmlng 1 Baked
Touch once to stop operation at oven during I Popcorn (310 Reheat
cooking. i DO
Touch twice (0 cancel cooking program. I
m. Kitchen Tlmer pad l Fresh . Frozen
Touch m ser mlnule Iuncllon. 1 vegetables Rice vegetables
n. Stan/Touch On pad.
Touch is start oven. G d
roun
Poultry FIsh/
I meat seafood
. Frozen Frozen
,, . main dish snacks
. k ‘
~ ‘ Compu Beverage I ComPl-l (ZED
r l / i Cook I Center ‘ Defrost \¥/
/ x I
Fi—AGDEK
RAGDEW
Ft-430BD
AAmexda/N
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 Flectifier
Assembly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
WARNING TO SERVICE PERSONNEL
‘0
Don‘t Touch l
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.
WARNINGzRISK 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 see
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 CI’laSSIS with the use of an insulated
screwdriver
Whenevertroubleshootlng is performed, the power sup-
ply must be disconnected. in some cases it may be nec—
essary to connect the power supply after the outercase
has been removed, in this event:
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 insulation
tape.
6. Afterthe above procedure, reconnectthe powersup»
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. Fte-install the outer case cabinet.
6. Reconnect the power supply cord after the outer
case cabinet is installed.
7. Stan the oven and check all functions.
After repairing
1. Reconnect all leads removed from components dur-
ing testing.
2. Pie-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 not, 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-AaoBK
H-Asoew
R—GSGBD
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPO-
SURE TO EXCESSIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron
or other microwave source, and make repairs as necessary: (1) Interlock operation, (2) proper
door closing, (3) seat 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 powerfor 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 misadlusted 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.
(RD21101 U)
BEFORE SERVICING
Before servicing an operative unit, pertorm a microwave emission check as per the Microwave
Measurement Procedure outlined in this service manual. If microwave emissions level is in excess
of the specified limit, Contact SHARP ELECTRONICS CORPORATION immediately @
1—800—23774277,
If the unit operates with the dooropen, 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 ELECTRONlCS CORPORATION oi any certified unit
tound with emissions in excess of 4mW/cm2- The owner of the unit should be instructed not to use
the unit until the oven has been brought into compliance.
(RDBi com)
Source Exif Data:
File Type : PDF File Type Extension : pdf MIME Type : application/pdf PDF Version : 1.3 Linearized : Yes Create Date : 2001:05:11 01:01:17 Producer : Acrobat Distiller 4.0 for Windows Author : VicodinES /CB /TNN Title : 76495.pdf Modify Date : 2001:05:11 01:01:44-04:00 Page Count : 36EXIF Metadata provided by EXIF.tools