Sharp R-9570 User manual

R-9570
.
SHARP SERVICE MANUAL
S7608R9570JII
MICROWAVE OVEN
MODEL R-9570
In the interests of user-safety the set should be restored to its original
condition and only parts identical to those specified be used.
This is a supplemental Service Manual for Model R-9570.
The R-9570 quite similar to Model R-9560.
Use this supplemental manual together with the Service Manual for Model R-9560.
Refer to the R-9560 Service Manual for complete operation, service information, etc.
TABLE OF CONTENTS
Page
FOREWORD ................................................................................................................................................. 1
CAUTION, MICROWAVE RADIATION .............................................................................................................. 1
THUMB INDEX ............................................................................................................................................... 1
PRODUCT DESCRIPTION .......................................................................................................................... 2-6
TOUCH CONTROL PANEL ASSEMBLY ...................................................................................................... 7-20
MICROWAVE MEASUREMENT ..................................................................................................................... 21
SCHEMATIC DIAGRAM ............................................................................................................................... 22
PICTORIAL DIAGRAM ............................................................................................................................ 23, 24
CONTROL PANEL CIRCUIT ..................................................................................................................... 25, 26
PRINTED WIRING BOARD ...................................................................................................................... 27, 28
PACKING AND ACCESSORIES ...................................................................................................................... 29
PARTS LIST ......................................................................................................................................... 30- 39
SHARP CORPORATION

R-9570
SERVICE MANUAL
SHARP
R-9570
FOREWORD
This Manual has been prepared to provide Sharp Service
Personnel with complete Operation and Service Information
for the Sharp Microwave Oven, R-9570.
The Model R-9570 is quite similar to the R-9560.
It is recommended that service personnel carefully study the
entire text of the two Manuals (R-9560 and R-95701, so they
will be qualified to render satisfactory customer service.
CAUTION
MICROWAVE RADIATION
Personnel should not be exposed to the microwave energy
which may radiate from the magnetron or other microwave
generating devices if it is improperly used or connected.
All input and output microwave connections, waveguides,
flanges, and gaskets must be secured.
Never operate the device without a microwave energy ab-
sorbing load attached.
Never look into an open waveguide or antenna while the
device is energized.
SHARP CORPORATION
OSAKA, JAPAN
PRODUCT DESCRIPTION 8PI
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R-9570
PRODUCT DESCRIPTION
EXPLANATION OF MICROWAVE COOKING
The Sharp Counter Top Microwave Oven uses microwave ener- Materials with a high moisture content, like most foods, will
gy to produce heat in the food to be cooked. Unlike conven- absorb microwave energy. As the microwave energy at a fre-
tional ovens microwave energy will cook foods without quency of 2450 Megahertz enters the food, the molecules align
applying external heat. themselves with the energy. Because the microwave are
changing polarity every half cycle, the food molecules are
Microwaves, which are short electromagnetic waves of RF (ra-
dio frequency) energy, pass through materials such as glass,
paper, china and most plastics. Materials such as metal and
aluminum foil tend to reflect microwaves and may be used only
as recommended in the cooking instructions.
changing direction every half cycle or oscillating back and forth
4,900,000,000 times per second. This high speed oscillation
causes friction between the molecules, thereby converting the
microwave energy to heat.
SPECIFICATIONS
ITEMS
Power requirements
DESCRIPTIONS
240V
50Hz
Single phase, 3 wire earthed
Power consumption 1.4kW
Microwave output power
Case dimensions
Width
Height
Depth
Cooking cavity dimensions
Width
Height
Depth
Turntable diameter
700W (2 litre water load)
622mm
382mm
476mm
406mm
248mm
422mm
395mm
Control complement Ciock (l:OO- 12:59)
Minute Timer (O- 99 minutes 99 seconds)
Variable Cooking Mode Selector
Repetition Rate:
HIGH .........................
Full power throughout the cooking time
MED HIGH .................24 sec. ON, 8 sec. OFF, approx. 70% of full power
MED .......................... 18 sec. ON, 14 sec. OFF, approx. 50% of full power
MED LOW
DEFROST ...................12 sec. ON, 20 sec. OFF, approx. 30% of full pow&
LOW ..........................6 sec. ON, 26 sec. OFF, approx. 10% of full power
Auto Start Cooking
Instant Cooking
Compu. Defrost Cooking
Sensor Cook
Sensor Temp.
Temperature Control (30°C - 11OOC)
Neight Approx. 27kg
2

R-9570
1. Oven ‘door with see through window.
2. Oven lamp.
3. Removable turntable.
4. Removable temperature probe.
5. Temperature probe receptacle.
6. Door latches.
7. One touch door open button.
8. Auto-Touch control panel.
9. Lighted digital display.
10. Waveguide cover.
11. Ventilation openings.
Auto-TouchTM Control Panel
I- INDICATORS
COMPUMC0IOWMOHIGH
~~~~~13@I/r/ @ IT/
l&p QyIL//A-:!,//\//JJf
collx AU10 111
LIGHTED DIGITAL DISPLAY
Shows readout of cooking time, cooking instruction or time of day.
SENSOR COOK PAD
Touch to select Sensor Cook settings 1-O.
SENSOR COOK
I- FreshwgeL=Lws
2-Frozen“EqelaDles
3-Bakedpcmlces
rl - Frozen dmnen
5 -Bacon
NUMBER PADS
Touch to enter cooking times, clock time or weight of food.
a-he 8 pasti)
9-Meat I.xel
SENSOR TEMP PAD
Touch to select Sensor Temp settings l-7.
TEMP PAD
Touch to select temperature when using probe.
COMPU DEFROST PAD
Touch to select Compu Defrost settings 1 -5.
during cooking; touch twice
Touch to set Clock, Auto Start or Timer/Hold.
VARIABLE COOKING CONTROL PADS
Touch to select microwave power setting. If not touched, HIGH
is automatically selected.
START PAD
Touch to start oven.
INSTANT COOK PAD
Touch to cook for 1 minute at HIGH or increase by 1 minute
multiples during variable cooking.
3

COMPU DEFROST COOKING
Your Sharp Microwave Oven has special function keys to defrost meats and poultry faster and better.
Compu Defrost automatically defrosts roast beef, pork, steaks, chops, minced meat, whole chicken and
chicken pieces. Each key has 3 defrosting stages.
* Suppose you want to defrost a 1.O kg steak with CompuDefrost.
Step
1.
2.
3.
4.
5.
6.
Procedure
Touch the COMPU DEFROST pad.
Select desired Compu Defrost setting.
Touch 2 to defrost steak.
Touch number pads to enter weight.
Touch the START pad.
Open the door. Turn steak over and shield
any warm portions.
3eturn food to the oven.
lose the door.
Touch the START pad.
1 Pad Order
[COMP”DEFROST)
0
START
Display
j-1 will flash and COMPU
DEFROST will appear on display.
Kg. will flash on and off.
:u::;:,
Kg. stops flashing and remains on
display.
Defrosting time, variable power
of the first stage and COOK will
appear on display.
The timer will begin to count down. When the 1st stage
finishes, an audible signal will sound 4 times and oven
will stop. COOK indicator will go off.
rland -1 will be dis-
played repeatedly.
-1 and /STf,CTJ will be dis-
played repeatedly.
( ,,,,) -- fzfs-yq
The timer will begin to count down. When the 2nd stage
finishes, an audible signal will sound 4 times and oven
will stop. COOK indicator will go off.
[-and ImJ will be dis-
played repeatedly.

Step
7.
Procedure
Open the door. Turn steak over, remove
any thawed pieces and shield any warm
portions.
Return food to the oven.
Close the door.
8. Touch START pad.*
I Pad Order
i
I
Display
1-1 and lmT:-;‘R will be
displayed repeatedly.
The timer will begin to count
down. When the 3rd stage finish-
es, an audible signal will sound.
COOK indicator will go off.
[ST:=:] will be displayed con-
tinuously.
When door is opened or the STOP/CLEAR pad is touched, STAND will go out and the time of day will
appear on the display.
NOTE:
1. The weight can be entered in 0.1 kg increments. Kilograms must be rounded off to the nearest tenth
of a kilogram. (Example: 1.75 kg should be rounded off to 1.8 kg)
2. Foods weighting more or less than the quantity listed in the chart should be defrosted following guide-
lines in the cookbook. If the incorrect weight is entered and the START pad is touched -1 and
incorrect weight will be displayed repeatedly. The STOP/CLEAR pad has to be touched to reprogramme
the oven.

Compu DefrostTMChart
Compu Defrost Food
Setting Amount Display Procedure Comment
!----I
Minced 0.5 r- 1x-,-,rr7
L’ -li
,-I,L,lI l Before defrosting.. . Stand, covered
1 beef I 1-a(1_ - --1[ _“kJ’“Tl IO- 15 minutes.
2.5 kg -!’ ‘= .~-- _
.1
Steak 0.2 --r-i,,-, h7
I i- Jy‘&’,-ril
~~-/[yT=-\lrl l Before defrosting Stand, covered
2 /T/E- ”1:1
-= -- l Remove any thawed IO- 15 minutes.
2.0 kg pieces after each stage.
3
P
Whole
chicken
Roast beef
pork
lamb
1.0 r- ,-,-;T-=51
L.y)-f 1-lA.1
I mG;E3=Ep] l Before defrosting...
l After the 1st stage Stand, covered
3.0 kg ... If there are warm IO- 15 minutes.
portions, shield them. ...Stand a longer
lo r-;xm l After the 2nd stage time, if
JC=I“:EICl[Em-] ... Turn over and necessary.
shield the warm 15-20 minutes.
portions.
Chicken
pieces 0.2 /I l Before defrosting...
I j SL-
/=’c ;j:f’FFE- l After the 1st stage
1.5 kg ... Turn over and
rearrange. Stand, covered
[xl j--,“:mj l After the 2nd stage ... IO- 15 minutes.
Remove any thawed
pieces.
Pork chops 0.5
I pmTTJ l Before defrosting. .. Stand covered
Lamb chops iRE-1 [-yEmETf& l Remove any thawed IO- 15 minutes.
3.O’kg pieces after each stage.
L I I ,
6

TOUCH CONTROL PANEL ASSEMBLY
OUTLINE OF TOUCH CONTROL PANEL
The touch control section consists of the following units as
shown in the block diagram.
(1) Relay unit
(2) Key unit
(3) Control unit
Exchange of signals between each unit is indicated by the ar-
rows in the block diagram. The principal functions of these
units and the signals communicated among them are explained
below.
Relay Unit
Relay unit consists of two Relays (RY1 and RY2), power source
circuit and buzzer circuit.
Key Unit
The key unit is composed of a matrix, signals generated in the
LSI are sent to the key unit through E8, El 2, El 3, El 5, El 6
and E17.
When a key pad is touched, a signal is completed through the
key unit and passed back to the LSI through AN4-AN7 to per-
form the function that was requested.
Control Unit
Control unit consists of LSI (IX2429YA), power source circuit,
synchronizing signal circuit, ACL circuit, buzzer circuit, AH sen-
sor circuit, temperature measurement circuit and indicator
circuit.
1)
2)
3)
4)
5)
LSI (IX2429YA)
This LSI controls the AH sensor signal, temperature meas-
urement signal, key strobe signal, relay driving signal for
oven function, and indicator signal.
Power Source Circuit
This circuit generates voltage [VC (for IX2429YA): - 5V,
VF +: - 18.5V, VF-: -22V, VA: - 15V and Vp: -27Vl
necessary in the control unit.
Synchronizing Signal Circuit
The power source synchronizing signal is available in order
to compose a basic standard time in the clock circuit.
It accompanies a very small error because it works on com-
mercial frequency.
ACL Circuit
Circuit to generate signals resetting the LSI to the initial
state when power is supplied.
Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
noticing sounds (key touch sound and completion sound).
6)
7)
8)
9)
-- t
Absolute Humidity Sensor Circuit
Temperature Measurement Circuit
The temperature of food is measured by the probe. The
probe has a thermistor built in whose resistance varies
with the temperature. The variation of resistance is de-
tected by the temperature measurement circuit.
Stop 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
light the oven lamp.
10) Indicator Circuit
Indicator element is a Fluorescent Display.
Basically, a Fluorescent Display is a triode having a
cathode, a grid and an anode. Usually, the cathode of a
Fluorescent Display is directly heated and the filament
serves as cathode.
The Fluorescent Display 6-digits, 13-segments are used
for displaying figures.
This circuit detects absolute humidity of food which is
cooking, to allow automatic cooking.
7

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n
Figure T-l. Block Diagram
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