Sharp R-580D User manual

R-580D
SHARP CORPORATION
SERVICE MANUAL
S9007R580DPJ/
MICROWAVEOVEN
MODEL R-580D
In interests of user-safety the oven should be restored to its
original condition and only parts identical to those specified
should be used.
TABLE OF CONTENTS Page
CAUTION, MICROWAVE RADIATION............................................................................................................. 1
WARNING..........................................................................................................................................................1
PRODUCT SPECIFICATIONS ......................................................................................................................... 2
GENERAL INFORMATION................................................................................................................................2
APPEARANCE VIEW ....................................................................................................................................... 3
OPERATION SEQUENCE................................................................................................................................ 4
FUNCTION OF IMPORTANT COMPONENTS .................................................................................................6
SERVICING ...................................................................................................................................................... 7
TEST PROCEDURE ......................................................................................................................................... 9
TOUCH CONTROL PANEL .............................................................................................................................16
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ........................................................... 21
MICROWAVE MEASUREMENT .................................................................................................................... 27
WIRING DIAGRAM ......................................................................................................................................... 28
PICTORIAL DIAGRAM ................................................................................................................................... 29
POWER UNIT CIRCUIT ..................................................................................................................................30
CPU UNIT CIRCUIT ........................................................................................................................................31
INDICATOR CIRCUIT......................................................................................................................................32
PRINTED WIRING BOARD .............................................................................................................................33
PARTS LIST ................................................................................................................................................... 34
Dinner
Plate
Sensor Cook
Sensor Instant Reheat
Meat
VegetablesCasserol Soup
Pizza Rice Pie
Express
Defrost Easy
Defrost
Desserts
Slow
Cook
Rice
Pasta Help Power
Level
STOP
Clear I
nstantCook
START
Timer
Clock
12345
67890

R-580D

R-580D
1
SERVICE MANUAL
MICROWAVE OVEN
R-580D
GENERAL IMPORTANT INFORMATION
ThisManualhasbeenpreparedtoprovideSharpCorp.Service
engineers with Operation and Service Information.
It is recommended that service engineers carefully study the
entire text of this manual, so they will be qualified to render
satisfactory customer service.
CAUTION
MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO RADIATION FROM
THE MICROWAVE GENERATOR OR OTHER PARTS
CONDUCTING MICROWAVE ENERGY.
Serviceengineersshouldnot beexposed tothe 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 absorbing
load attached. Never look into an open waveguide or
antenna while the device is energized.
WARNING
Never operate the oven until the following points are ensured.
(A) The door is tightly closed.
(B) The door brackets and hinges are not defective.
(C) The door packing is not damaged.
(D) The door is not deformed or warped.
(E) There is not any other visible damage with the oven.
Servicing and repair work must be carried out only by trained
service engineers.
All the parts marked "*" on parts list are used at voltages more
than 250V.
Removal of the outer wrap gives access to potentials above
250V.
All the parts marked "∆" on parts list may cause undue micro-
wave exposure, by themselves, or when they are damaged,
loosened or removed.
SHARP CORPORATION
OSAKA, JAPAN
PRODUCT SPECIFICATIONS
APPEARANCE VIEW
OPERATING SEQUENCE
FUNCTION OF IMPORTANT
COMPONENTS
SERVICING AND
TROUBLESHOOTING CHART
TEST PROCEDURE
TOUCH CONTROL PANEL
ASSEMBLY
COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
MICROWAVE MEASUREMENT
WIRING DIAGRAM
PARTS LIST

R-580D
2
ITEM DESCRIPTION
Power Requirements 230 - 240 Volts
50 Hertz
Single phase, 3 wire earthed
Power Consumption 1.55kW
Power Output 1000 watts nominal of RF microwave energy (IEC Test Procedure)
Operating frequency 2450 MHz
Case Dimensions Width 495 mm
Height 355 mm including foot
Depth 525 mm
Cooking Cavity Dimensions Width 450 mm
Height 222 mm
Depth 432 mm
Turntable diameter 406 mm
Control Complement Touch Control System
Clock ( 1:00 - 12:59)
Timer (0 - 99 minutes 99 seconds)
Microwave Power for Variable Cooking
Repetition Rate;
HIGH ...............................................Full power throughout the cooking time
MEDIUM HIGH ..................................................approx. 70% of Full Power
MEDIUM .............................................................approx. 50% of Full Power
MEDIUM LOW ....................................................approx. 30% of Full Power
LOW ....................................................................approx. 10% of Full Power
HELP pad
SENSOR INSTANT REHEAT pads
SENSOR COOK pads
EXPRESS DEFROST pad
EASY DEFROST pad
SLOW COOK pad
NUMBER pads
POWER LEVEL pad
TIMER/CLOCK pad
STOP/CLEAR pad
INSTANT COOK/START pad
Set Weight Approx. 22 kg
PRODUCT SPECIFICATIONS
GENERAL INFORMATION
WARNING
THIS APPLIANCE MUST BE EARTHED
IMPORTANT
THE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING CODE:
GREEN-AND-YELLOW : EARTH
BLUE : NEUTRAL
BROWN : LIVE

R-580D
3
APPEARANCEVIEW
1. Door handle
2. Touch control panel
3. Digital readout
4. See through door
5. Door seals and sealing surfaces
6. Door safety latches
7. Door hinges
8. Coupling
9. Menu label
10.Oven lamp
11.Waveguide cover
12.Turntable tray
13.Turntable support
14.Ventilation openings
15.Power supply cord
NOTE:
The directed features are disabled after three minutes when the oven is not in use. These features are
automatically enabled when the door is opened and closed or the STOP/ CLEAR pad is pressed.
1. SENSOR INSTANT REHEAT PADS
Press once to rehaet 1 of 6 popular menus. (See Note.)
2. SENSOR COOK PADS
Press to select a Sensor Cook menus.
3. SLOW COOK PAD
Press to cook slowly and for a longer time.
4. HELP PAD
Press to select auto start, child lock, demonstration modes or info on pads.
Press to get cooking information.
5. EXPRESS DEFROST PAD
Press to select the Express Defrost menu.
6. EASY DEFROST PAD
Press to defrost frozen food by entering quantity.
7. NUMBER PADS
Press to enter cooking times, clock time, weight or quantity of food.
8. POWER LEVEL PAD
Press to select microwave power setting. If not pressed, HIGH is automatically selected.
Press to after the cooking result for automatic operations.
9. TIMER/CLOCKPAD
Press to set clock or timer.
10.STOP/CLEAR PAD
Press to clear during programming.
Press once to stop operation of oven during cooking; press twice to cancel cooking programme.
11.INSTANT COOK/START PAD
Press once to cook for 1 minute on HIGH or increase by 1 minute multiples each time this pad is pressed during cooking. Press
to start the oven after setting programmes. (See note.)
,
,
,
,
,
,
,
,
,,,,,
,,,,,
,
,
,
,
,
2
1
654 8
7
5910
11 15
13
12
3
Breakfast
Bar
SensorCookingMorefrom your Microwave
Vegetables
Popcorn
Linchon
theRun
Super
Defrost Compu
Defrost
OneDish
Dinners
Beverage
center
Frozen
Foods
Main
Entrees Kitchen
Timer/Clock
Sensor
Reheat
Baked
Potatoes Custom
Help Power
Level
STOP
Clear START
Touchon
Minute
PLus
12345
67890
14
Dinner
Plate
Sensor Cook Sensor Instant Reheat
Meat
VegetablesCasserol Soup
Pizza Rice Pie
Express
Defrost Easy Defrost
Desserts
Slow
Cook
Rice
Pasta Help
Power
Level
STOP
Clear I
nstantCook
START
Timer
Clock
12345
67890
1
789
10 11
Indicator
2 3 4
56
TOUCH CONTROL PANEL

R-580D
4
OPERATION SEQUENCE
OFF CONDITION
Closing the door activates all door interlock switches
(1st. latch switch, 2nd. latch switch and stop switch).
IMPORTANT
Whentheovendoorisclosed,themonitorswitchcontacts
(COM-NC) must be open.
Whenthemicrowaveovenispluggedinawalloutlet,rated
voltage is supplied to the noise filter and the control unit.
Figure O-1 on page 28
1. The display shows "SHARP MICRO-WAVE OVEN".
2. To set any programmes or set the clock, you must
first touch the STOP/CLEAR pad.
3. : appears in the display.
NOTE: When the oven door is opened, the oven lamp
comes on at this time.
MICROWAVE COOKING CONDITION
HIGH COOKING
Enter a desired cooking time with the touching NUMBER
pad and start the oven with touching START pad.
Function sequence
Figure O-2 on page 28
CONNECTED COMPONENTS RELAY
Oven lamp, Fan motor, Turntable motor RY1
Power transformer RY2
1. Ratedvoltage issupplied tothe primarywindingof the
power transformer. The voltage is converted to about
3.3 volts A.C. output on the filament winding and high
voltage of approximately 2000 volts A.C. on the
secondary winding.
2. The filament winding voltage (3.3 volts) heats the
magnetronfilamentandthehighvoltage(2000volts)is
sentto thevoltage doublingcircuit, whereit isdoubled
to negative voltage of approximately 4000 volts D.C..
3. The 2450 MHz microwave energy produced in the
magnetron generates a wave length of 12.24 cm. This
energyischanneledthroughthewaveguide(transport
channel)into theovencavity,where thefoodis placed
to be cooked.
4. Whenthecookingtimeisup,asignaltoneisheardand
the relays RY1+RY2 go back to their home position.
The circuits to the oven lamp, power transformer, fan
motor and turntable motor are cut off.
5. When the door is opened during a cook cycle, the
switches come to the following condition
CONDITION
DURING DOOR OPEN
SWITCH CONTACT COOKING (NOCOOKING)
1st. latch switch COM-NO Closed Open
2nd. latch switch COM-NO Closed Open
Monitor switch COM-NC Open Closed
Stop switch COM-NO Closed Open
The circuits to the power transformer, fan motor and
turntable motor are cut off when the 1st. latch switch,
2nd.latchswitch,and stopswitcharemadeopen.The
ovenlamp remainson evenif theoven dooris opened
after the cooking cycle has been interrupted, because
therelayRY1staysclosed.Shown inthedisplayisthe
remaining time.
6. MONITOR SWITCH CIRCUIT
The monitor switch is mechanically controlled by
oven door, and monitors the operation of the 1st and
2nd. latch switches.
6-1 When the oven door is opened during or after the
cycle of a cooking program, the 1st. latch switch and
stop switch must open their contacts first.
After that the contacts (COM-NC) of the monitor
switch can be closed, and the contacts of the 2nd.
latch switch can be opened.
6-2. When the oven door is closed, the contacts (COM-
NC) of the monitor switch must be opened and the
contactsofthe2nd.latchswitchmustbeclosed.After
that the contacts of the 1st. latch switch and stop
switch are closed.
6-3. When the oven door is opened and the contacts of
the1st. latch switch, 2nd. latch switch remain closed.
ThefuseM10A willblow,becausethe monitorswitch
is closed and a short circuit is caused.
MEDIUM HIGH, MEDIUM, MEDIUM LOW, LOW
COOKING
When the microwave oven is preset for variable cooking
power, 230-240 volts A.C. power is supplied to the power
transformer intermittently within a 32-second time base
through the relay contact which is coupled with the cur-
rent-limitingrelay.Thefollowinglevelsofmicrowavepower
are given.
SETTING;
NOTE: TheON/OFFtimeratiodoesnotexactlycorrespond
to the percentage of microwave power, because
approx. 2 seconds are needed for heating up the
magnetron filament.
SENSOR COOKING CONDITION
Using the SENSOR COOK or SENSOR INSTANT RE-
HEAT function, the foods are cooked or reheated without
figuring time, power level or quantity. When the oven
senses enough steam from the food, it relays the informa-
tiontoitsmicroprocessorwhichwillcalculatetheremaining
cooking time and power level needed for best 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-
perimentwitheachfoodcategoryandinputtedintotheLSI.
32 sec. ON
24 sec. ON
18 sec. ON
12 sec. ON
6 sec. ON
8 sec. OFF
14 sec. OFF
20 sec. OFF
26 sec. OFF
HIGH
MEDIUM HIGH
MEDIUM
MEDIUM LOW
LOW
Approx. 70%
Approx. 50%
Approx. 30%
Approx. 10%

R-580D
5
An example of how sensor works:
1. Potatoes at room temperature. Vapor is emitted very
slowly.
2. Heatpotatoes.Moistureandhumidityisemittedrapidly.
You can smell the aroma as it cooks.
3. Sensor detects moisture and humidity and calculates
cooking time and variable power.
Cooking Sequence.
1. Touch each SENSOR COOK or SENSOR INSTANT
REHEATfunctionpadtooperatingthesensorcooking.
(See the operation manual for the proper procedure.)
NOTE: The oven should not be operated on SENSOR
COOK or SENSOR INSTANT REHEAT
immediately after plugging in the unit. Wait two
minutes before cooking on SENSOR COOK or
SENSOR INSTANT REHEAT.
2. The coil of shut-off relay (RY-1) is energized, the
turntable motor, oven lamp and cooling fan motor are
turned on, but the power transformer is not turned on.
3. After about 16 seconds, the cook relay (RY-2) is
energized. The power transformer is turned on,
microwaveenergyisproducedandfirststageisstarted.
The16 secondsisthe coolingtimerequired to remove
any vapor from the oven cavity and sensor.
NOTE: During this first stage, do not open the door or
touch STOP/CLEAR pad.
4. When the sensor detects the vapor emitted from the
food,thedisplayswitchesovertotheremainingcooking
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. Whenthetimerreacheszero,anaudiblesignalsounds.
Theshut-offrelayandcookrelayarede-energizedand
the power transformer, oven lamp, etc. are turned off.
6. Opening the door or touching the STOP/CLEAR pad,
the time of day will reappear on the display and the
oven will revert to an OFF condition.
MICROWAVE
MICROWAVE
AH SENSOR
POWER OUTPUT REDUCTION
After 100% power cooking mode is carried out for more
than 40 minutes, the power out-put is automatically re-
duced to 70%.

R-580D
6
FUNCTION OF IMPORTANT COMPONENTS
defect in the control unit, the thermal cut-out will open.
Undernormaloperation,theoventhermalcut-outremains
closed.However,whenabnormallyhightemperaturesare
reached within the oven cavity, the oven thermal cut-out
will open at 125˚C, causing the oven to shut down. The
defective thermal cut-out must be replaced with new one.
MAGNETRON THERMAL CUT-OUT
The thermal cut-out located near the magnetron is de-
signed to prevent damage to the magnetron if an over
heated condition develops in the tube due to cooling fan
failure,obstructedairguide,dirtyorblockedairintake,etc.
Under normal operation, the thermal cut-out remains
closed.However,whenabnormallyhightemperaturesare
reached within the magnetron, the thermal cut-out will
open at 125˚C causing the oven to shut down. The
defective thermal cut-out must be replaced with new one.
TURNTABLE MOTOR
Theturntablemotordrivestheturntablerollerassemblyto
rotate the turntable.
FAN MOTOR
Thefanmotordrivesabladewhichdrawsexternalcoolair.
This cool air is directed through the air vents surrounding
the magnetron and cools the magnetron. This air is
channeled through the oven cavity to remove steam and
vapors given off from the heating foods. It is then ex-
hausted through the exhausting air vents at the oven
cavity
NOISE FILTER
The noise filter prevents the radio frequency interference
that might flow back in the power circuit.
DOOR OPEN MECHANISM
Thedoor isopened bypulling thedoor,refer tothe Figure
D-1.
Figure D-1. Door Open Mechanism
1ST.LATCHSWITCH,2ND.LATCHSWITCHAND
STOP SWITCH
1. Whentheovendoorisclosed,thecontacts (COM-NO)
must be closed.
2. When the oven door is opened, the contacts (COM-
NO) must be opened.
MONITOR SWITCH
1. Whentheovendoorisclosed,thecontacts(COM-NC)
must be opened.
2. When the oven door is opened, the contacts (COM-
NC) must be closed.
3. Iftheovendoorisopenedandthecontacts(COM-NO)
ofthe1st.latchswitchand2nd.latchswitchfailtoopen,
the fuse M10A blows simultaneously with closing the
contacts (COM-NC) of the monitor switch.
CAUTION: BEFORE REPLACING A BLOWN FUSE
M10ATESTTHE1ST.LATCHSWITCH, 2ND.
LATCH SWITCH MONITOR SWITCH AND
MONITOR RESISTOR FOR PROPER OP-
ERATION.
MONITOR RESISTOR 0.8Ω20W
The monitor resistor prevents the fuse M10A bursting
when the fuse M10A blows due to the operation of the
monitor switch.
HIGH VOLTAGE FUSE
Thehighvoltagefuseblowswhenthehighvoltagerectifier
or magnetron is shorted.
FUSE M10A
1. ThefuseM10Ablowswhenthecontacts(COM-NO)of
the 1st. latch switch and 2nd. latch switch remain
closed with the oven door open and when the monitor
switch closes.
2. If the wire harness or electrical components are short-
circuited, this fuse M10A blows to prevent an electric
shock or fire hazard.
OVEN THERMAL CUT-OUT
Thethermal cut-out,located onthetop ofthe ovencavity,
is designed to prevent damage to the oven by fire. If the
foods load is overcooked, by either error in cook time or
Latch Hook
Stop Switch
2nd. Latch Switch
Door
1st. Latch Switch
Monitor Switch
Latch
Heads

R-580D
7
SERVICING
WARNING TO SERVICE PERSONNEL
Microwaveovenscontaincircuitrycapableofproducingveryhighvoltageandcurrent,contactwithfollowingparts
of the high voltage circuit will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High
voltage rectifier assembly, High voltage fuse, High voltage harness.
REMEMBER TO CHECK 3D
1) Disconnect the supply.
2) Door opened, and wedged open.
3) Todischargethehigh voltagecapacitor,waitfor60
seconds.
WARNING: AGAINST THE CHARGE OF THE
HIGH-VOLTAGE CAPACITOR
Thehigh-voltagecapacitorremainschargedabout
60 seconds after the oven has been switched off.
Wait for 60 seconds and then short-circuit the
connectionofthehigh-voltagecapacitor(thatis,of
the connecting lead of the high-voltage rectifier)
against the chassis with the use of an insulated
screwdriver.
Sharprecommendthatwhereverpossiblefault-finding
is carried out with the supply disconnected. It may, in
some cases, be necessary to connect the supply after
the outer case has been removed, in this event carry
out 3D checks and then disconnect the leads to the
primary of the power transformer. Ensure that these
leads remain isolated from other components and the
ovenchassis.(Useinsulationtapeifnecessary.)When
the testing is completed carry out 3D checks and
reconnect the leads to the primary of the power trans-
former.
REMEMBER TO CHECK 4R
1) Reconnect all leads removed from components
during testing.
2) Replace the outer case (cabinet).
3) Reconnect the supply.
4) Run the oven. Check all functions.
Microwave ovensshould notbe runempty. Totest 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 microwave timer for two (2)
minutes. Set the power level to HIGH and push the
START button. When the two minutes has elapsed
(timeratzero)carefullycheckthatthewaterisnowhot.
If the water remains cold carry out 3D checks and re-
examine the connections to the component being
tested.
When troubleshooting the microwave oven, it is helpful to
follow the Sequence of Operation in performing the
checks.Manyofthepossiblecausesoftroublewillrequire
that a specific test be performed. These tests are given a
procedure letter which will be found in the "Test
Procedure"section.
When all service work is completed, and the oven is fully assembled, the microwave power output should be
checked and microwave leakage test should be carried out.
TROUBLESHOOTING GUIDE
IMPORTANT: If the oven becomes inoperative because
of a blown fuse M10A in the 1st. latch
switch - 2nd. latch switch - monitor switch
- monitor resistor circuit, check the 1st.
latch switch, 2nd. latch switch, monitor
switchand monitorresistorbeforereplac-
ing the fuse M10A.

R-580D
8
CK = Check / RE = Replace
MAGNETRON POWER TRANSFORMER H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE CAPACITOR 1ST. LATCH SWITCH 2ND. LATCH SWITCH STOP SWITCH MONITOR SWITCH
MONITOR RESISTOR THERMAL CUT-OUT 125˚C FAN MOTOR TURNTABLE MOTOR FUSE M10A TOUCH CONTROL PANEL
KEY UNIT RELAY (RY-1, RY-2) FOIL PATERN ON P.W.B. POWER SUPPLY CORD SHORTED WIRE HARNESS
OPENED WIRE HARNESS OVEN LAMP OR SOCKET WALL OUTLET MISADJUSTMENT SWITCH HOME FUSE OR BREAKER BLOCKED COOLING FAN
BLOCKED VENTILATION NOISE FILTER HIGH VOLTAGE FUSE AH SENSOR
Homefuseblowswhenpower
supply cord is plugged into
wall outlet.
FUSE M10A blows when
power supply cord is plugged
into wall outlet.
Display does not show any-
thingwhenpowersupply cord
is plugged into wall outlet.
Display doesnotoperateprop-
erly when STOP/CLEAR pad
is touched.
Oven lamp does not light at
door opened. (Display ap-
pears.)
Oven does not start when the
START pad is touched. (Dis-
play appears)
Ovenlampdoesnotlight(Dis-
play appears.)
Fan motor does not operate.
(Display appears.)
Turntable motor assembly
doesnotoperate.(Displayap-
pears.)
Oven or any electrical parts
does not stop when cooking
timeis0orSTOP/CLEARpad
is touched.
Oven seems to be operating
butlittleornoheatisproduced
in oven load. (Microwave
power level is set at HIGH)
Oven does not seems to be
operating properly when ME-
DIUM HIGH, MEDIUM, ME-
DIUM LOW or LOW is set.
(Oven operates properly at
HIGH and then the STOP/
CLEAR pad is touched the
oven stops.)
Ovengoesintocookcyclebut
shutsdownbeforeendofcook-
ing cycle.
AH sensor does not end dur-
ingSensorCookingcondition.
(Ovendoesnotshutoffaftera
cup of water is boiling by sen-
sor cooking.)
Oven stops at 16 sec. after
starting.
TEST PROCEDURE A B C D EEE EGFHH I LMNO RECK CK RECK CKCK CK CK JKP
CONDITION PROBLEM
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
ON
CONDITION
OFF
CONDITION
SENSOR
COOKING
CONDITION