Sharp R-408EW User manual

R-408EW
TABLE OF CONTENTS Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY.................. INSIDE FRONT COVER
BEFORE SERVICING..................................................................................................... INSIDE FRONT COVER
WARNING TO SERVICE PERSONNEL .............................................................................................................. 1
MICROWAVE MEASUREMENT PROCEDURE .................................................................................................. 2
FOREWORD AND WARNING............................................................................................................................. 3
PRODUCT SPECIFICATIONS............................................................................................................................. 4
GENERAL INFORMATION ................................................................................................................................. 4
OPERATION ........................................................................................................................................................ 6
TOUCHCONTROLPANEL....................................................................................................................................8
PICTORIALDIAGRAM ..........................................................................................................................................9
POWERUNITCIRCUIT.......................................................................................................................................10
CPUUNITCIRCUIT.............................................................................................................................................11
PARTS LIST........................................................................................................................................................12
PACKINGANDACCESSORIES .........................................................................................................................16
S91M174R408EE
R-408EW
MICROWAVEOVEN
MODELS
SUPPLEMENTAL SERVICE MANUAL
SHARP ELECTRONCS CORPORATION This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135
R-408EW
In the interest of user-safety the oven should be restored to its original condition and only 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 following parts may result in a severe, possibly fatal, electrical shock. (High Voltage Capacitor, High
Voltage Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..)
This is a supplemental Service Manual for Microwave Oven model R-408EW. This model is quite similar to the base
models; R-409EW/R-410EK/EW (S21M160R409EE).
This supplemental manual must be used in conjunction with the base model service manual for complete operation,
service, safety and replacement parts information.

R-408EW
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE
ENERGY
(a) Donot operateor allow the ovento be operated with the door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwavesource,andmakerepairsasnecessary:(1)interlockoperation, (2) proper door closing, (3)
sealandsealingsurfaces(arcing,wear,andotherdamage),(4)damagetoor loosening of hinges and
latches,(5)evidenceofdropping or abuse.
(c) Beforeturning on microwave power for anyservice test or inspection within themicrowave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity,andconnections.
(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation
and transmission systems shall be repaired, replaced, or adjusted by procedures described in this
manualbefore the oven isreleased to the owner.
(e) A microwave leakage check to verify compliance with the Federal Performance Standard should be
performedoneachovenpriortorelease to the owner.
BEFORE SERVICING
Before servicing an operative unit, perform a microwave emission check as per the
Microwave Measurement Procedure outlined in this service manual.
If microwave emissions level is in excess of the specified limit, contact SHARP
ELECTRONICSCORPORATIONimmediately @1-800-237-4277.
If the unit operates with the door open, service person should 1) tell the user
not to operate the oven and 2) contact SHARP ELECTRONICS CORPORATION and Food and
Drug Administration's Center for Devices and Radiological Health immediately.
Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit
found 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.

1
R-408EW
WARNING TO SERVICE PERSONNEL
Microwave ovens contain circuitry capable of pro-
ducing very high voltage and current, contact with
following parts
may result in a severe, possibly
fatal, electrical shock.
(Example)
HighVoltageCapacitor,HighVoltagePowerTrans-
former,Magnetron,HighVoltageRectifierAssem-
bly, High Voltage Harness etc..
Read the Service Manual carefully and follow all
instructions.
Before Servicing
1. Disconnect the power supply cord , and then
remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
WARNING:RISK OF ELECTRIC SHOCK.
DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.
The high-voltage capacitor remains charged about 60
secondsaftertheovenhasbeenswitchedoff.Waitfor60
secondsandthenshort-circuittheconnectionofthehigh-
voltagecapacitor(thatisthe connecting lead of thehigh-
voltage rectifier) against the chassis with the use of an
insulated screwdriver.
Whenever troubleshooting is performed the power supply
mustbedisconnected.Itmay,in somecases,benecessary
to connect the power supply after the outer case has been
removed, in this event:
1. Disconnect the power supply cord, and then remove
outer case.
2. Open the door and block it open.
3. Discharge 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. After that procedure, reconnect the power supply cord.
When the testing is completed,
1. Disconnect the power supply cord, and then remove
outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect the leads to the primary of the power
transformer.
5. Reinstall the outer case (cabinet).
6. Reconnectthepowersupplycordaftertheoutercaseis
installed.
7. Run the oven and check all functions.
After repairing
1. Reconnect all leads removed from components during
testing.
2. Reinstall the outer case (cabinet).
3. Reconnectthepowersupplycordaftertheoutercaseis
installed.
4. Run the oven and check all functions.
Microwaveovens shouldnotbeoperatedempty.Totestfor
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 that the water is now hot. If the water
remains cold carry out Before Servicing procedure and re-
examine the connections to the component being tested.
When all service work is completed and the oven is fully
assembled,themicrowavepoweroutputshouldbechecked
and a microwave leakage test should be carried out.
Don't Touch !
Danger High Voltage

2
R-408EW
MICROWAVE MEASUREMENT PROCEDURE
A. Requirements:
1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven
shouldnotexceed1mW/cm2atanypoint5cmormorefromtheexternalsurfaceoftheoven,measuredpriortoacquisition
byapurchaser, andthereafter(throughthe useful lifeoftheoven), 5mW/cm2atanypoint5cm ormorefromthe external
surface of the oven.
2) Safetyinterlockswitches,primaryinterlockrelayanddoorsensing switch shall prevent microwave radiation emission in
excess of the requirement as above mentioned. Secondary interlock switch shall prevent microwave radiation emission
in excess of 5 mW/cm2at any point 5cm or more from the external surface of the oven.
B. Preparation for testing:
Before beginning the actual measurement of leakage, proceed as follows:
1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.
Important:
Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard for
microwave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.
2) Place the oven tray in the oven cavity.
3) Place the load of 275±15 ml (9.8 oz) of tap water initially at 20±5O C (68OF) in the center of the oven cavity.
Thewatercontainershallbea lowformof600 ml(20oz)beakerwithaninside diameterofapprox.8.5 cm(3-1/2in.)and
made of an electrically nonconductive material such as glass or plastic.
Theplacingof this standard load in the oven isimportantnotonly to protect the oven, but also toinsurethatany leakage
is measured accurately.
4) Set the cooking control on Full Power Cooking Mode.
5) Closethedoorandselectacookcycleofseveralminutes.Ifthewaterbeginstoboilbeforethesurveyiscompleted,replace
it with 275 ml of cool water.
C. Leakage test:
Closed-door leakage test (microwave measurement):
1) Grasptheprobeofthesurveyinstrumentandholditperpendiculartothegapbetweenthedoorandthebodyoftheoven.
2) Movetheprobeslowly,notfasterthan1in./sec.(2.5cm/sec.)alongthegap,watchingforthemaximumindicationonthe
meter.
3) Checkforleakageatthedoorscreen,sheetmetalseamsandotheraccessiblepositionswherethecontinuityofthemetal
has been breached (eg., around the switches, indicator, and vents).
Whiletestingforleakagearoundthedoor,pullthedoorawayfromthefrontoftheovenasfarasispermittedbytheclosed
latch assembly.
4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,
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.

3
R-408EW
SHARP ELECTRONICS CORPORATION
SHARP PLAZA, MAHWAH,
NEW JERSEY 07430-2135
SUPPLEMENTAL SERVICE MANUAL
MICROWAVE OVEN
R-408EW
FOREWORD
This Manual has been prepared to provide Sharp Electronics Corp.
ServicePersonnelwithOperationandServiceInformationfortheSHARP
MICROWAVEOVEN,R-408EW.
ThemodelR-408EWisquitesimilartobasemodelsR-409EW/R-410EK/
EW(Ref.#S21M160R409EE).
Itisrecommendedthatservicepersonnelcarefullystudytheentiretextof
this manual so that they will be qualified to render satisfactory customer
service.
Checktheinterlockswitchesandthedoorsealcarefully.Specialattention
shouldbegiventoavoidelectricalshockandmicrowaveradiationhazard.
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 no other visible damage with the oven.
Servicing and repair work must be carried out only by trained service
personnel. DANGER
Certain initial parts are intentionally not grounded and present
a risk of electrical shock only during servicing. Service person-
nel - Do not contact the following parts while the appliance is
energized;
High Voltage Capacitor, Power Transformer, Magnetron, High
Voltage Rectifier Assembly, High Voltage Harness;
If provided, Vent Hood, Fan assembly, Cooling Fan Motor.
All the parts marked “*” on parts list are used at voltages more than
250V.
Removal of the outer wrap gives access to voltage above 250V.
All the parts marked “∆” on parts list may cause undue microwave
exposure, by themselves, or when they are damaged, loosened or
removed.
PRODUCTDESCRIPTION
GENERALINFORMATION
OPERATION
TROUBLESHOOTINGGUIDEAND
TESTPROCEDURE
TOUCHCONTROLPANEL
COMPONENTREPLACEMENT
ANDADJUSTMENTPROCEDURE
WIRINGDIAGRAM
PARTS LIST

4
R-408EW
GENERAL INFORMATION
GROUNDING INSTRUCTIONS
This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installed
and grounded in accordance with the National Electrical Code and local codes and ordinances.
Intheeventofanelectricalshortcircuit,groundingreducestheriskofelectricshockbyprovidinganescapewirefortheelectric
current.
WARNING: Improper use of the grounding plug can result in a risk of electric shock.
ElectricalRequirements
The electrical requirements are a 120 volt 60 Hz, AC only,
15or20amp.fusedelectricalsupply.Itisrecommendedthataseparatecircuitservingonlythisappliancebeprovided.When
installing this appliance, observe all applicable codes and ordinances.
A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord.
Whereatwo-prongedwall-receptacleisencountered,itisthepersonalresponsibilityandobligationofthecustomertocontact
SPECIFICATION
ITEM DESCRIPTION
PowerRequirements 120 Volts
13.8Amperes,1650watts
60Hertz
Singlephase,3wiregrounded
PowerOutput 1200watts(IEC705TESTPROCEDURE)
Operatingfrequencyof2450MHz
CaseDimensions Width 21-21/32"
Height 12-3/8"
Depth 18-7/16"
CookingCavityDimensions Width 15-23/32"
Height 9-21/32"
1.6 Cubic Feet Depth 17-7/8"
ControlComplement Touch Control System
Clock ( 1:00 - 12:59 )
Timer (0 - 99 min. 99 seconds)
MicrowavePowerforVariableCooking
Repetition Rate;
P-HI .................................................. Fullpowerthroughoutthecooking time
P-90 ....................................................................approx. 90% of Full Power
P-80 ....................................................................approx. 80% of Full Power
P-70 ....................................................................approx. 70% of Full Power
P-60 ....................................................................approx. 60% of Full Power
P-50 ....................................................................approx. 50% of Full Power
P-40 ....................................................................approx. 40% of Full Power
P-30 ....................................................................approx. 30% of Full Power
P-20 ....................................................................approx. 20% of Full Power
P-10 ....................................................................approx. 10% of Full Power
P-0 ......................................................No powerthroughoutthecookingtime
BEVERAGEpad, POPCORN pad, MINUTE PLUS pad, INSTANT ACTION pads
COMPU DEFROSTpads,NumberselectionpadsPowerLevelpad,Timer/Clock
pad,Stop/Clearpad,START pad,Keepwarm&Reheat
Oven Cavity Light Yes
SafetyStandard UL Listed FCC Authorized
DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J

5
R-408EW
a qualified electrician and have it replaced with a properly grounded
three-pronged wall receptacle or have a grounding adapter properly
groundedandpolarized.Iftheextensioncordmustbeused,itshouldbe
a 3-wire, 15 amp. or higher rated cord. Do not drape over a countertop
ortablewhereitcanbepulledonbychildrenortrippedoveraccidentally.
CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR RE-
MOVE THE ROUND GROUNDING PRONG FROM THIS
PLUG.
OVEN DIAGRAM
1. One touch door open button.
Push to open door.
2. Door latches.
The oven will not operate unless the
door is securely closed.
3. Removable turntable support.
4. Removable turntable.
The turntable will rotate clockwise or
counterclockwise.
5. Oven lamp.
It will light when oven is operating or
door is opened.
6. Oven door with see-through window.
7. Ventilation openings. (Rear)
8. Auto-Touch control panel.
9. Time display: Digital display, 99
minutes 99 seconds.
10.Wave guide cover.
11.Power supply cord
TOUCH CONTROL PANEL
NOTE:
The directed features are disa-
bled after one minute 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.
R-408EW
1
65
4
210
11
9
7
8
3
3-Pronged
Plug
Grounded
Receptacle Box
Grounding Pin
3-Pronged Receptacle

6
R-408EW
OPERATION
DESCRIPTION OF OPERATING SEQUENCE
Thefollowingisadescriptionofcomponentfunctionsduring
oven operation.
OFF CONDITION
Closing the door activates the door sensing switch and
secondary interlock switch. (In this condition, the monitor
switch contacts are opened.)
When oven is plugged in, 120 volts A.C. is supplied to the
control unit. (Figure O-1).
1. Thedisplaywillshowflashing"88:88".
Tosetanyprogramorsettheclock,youmustfirsttouch
theSTOP/CLEAR pad. The display will clear, and " : "
will appear.
COOKING CONDITION
Program desired cooking time by touching the NUMBER
pads. Program the power level by touching the POWER
LEVEL pad and then a Number pad.
When the START pad is touched, the following operations
occur:
1. The contacts of relays are closed and components
connected to the relays are turned on as follows.
(For details, refer to Figure O-2)
RELAY CONNECTED COMPONENTS
RY-1 oven lamp/turntable motor/fan motor
RY-2 power transformer
2. 120 volts A.C. is supplied to the primary winding of the
power transformer and is converted to about 3.3 volts
A.C. output on the filament winding, and approximately
2370 volts A.C. on the high voltage winding.
3. Thefilamentwindingvoltageheatsthemagnetronfilament
andtheH.V.windingvoltage issentto avoltagedoubler
circuit.
4. The microwave energy produced by the magnetron is
channelled through the waveguide into the cavity feed-
box, and then into the cavity where the food is placed to
be cooked.
5. Upon completion of the cooking time, the power
transformer, oven lamp, etc. are turned off, and the
generation of microwave energy is stopped. The oven
will revert to the OFF condition.
6. Whenthedoorisopenedduringacookcycle,themonitor
switch,door sensingswitch,secondaryinterlockswitch,
relay(RY1)andprimaryinterlockrelayareactivatedwith
the following results. The circuits to the turntable motor,
thecooling fan motor, and the high voltage components
are de-energized, the oven lamp remains on, and the
digital read-out displays the time still remaining in the
cook cycle when the door was opened.
7. Themonitor switchelectricallymonitorstheoperationof
the secondary interlock switch and primary interlock
relayandismechanicallyassociatedwiththedoorsothat
it will function in the following sequence.
(1)When the door opens from the closed position, the
primary interlock relay (RY2) and secondary interlock
switch open their contacts. And contacts of the relay
(RY1)remainsclosed.Thenthemonitorswitchcontacts
close.
(2)When the door is closed from the open position, the
monitor switch contacts open first. Then the contacts of
the secondary interlock switch and door sensing switch
close. And contacts of the relay (RY1) open.
Ifthesecondaryinterlockswitchand primaryinterlockrelay
(RY2)failwiththecontactsclosedwhenthedoorisopened,
the closing of the monitor switch contacts will form a short
circuitthroughthemonitorfuse,secondaryinterlockswitch,
relay (RY1) and primary interlock relay (RY2), causing the
monitor fuse to blow.
POWER LEVEL P-0 TO P-90 COOKING
WhenVariableCookingPowerisprogrammed,the120volts
A.C. is supplied to the power transformer intermittently
throughthecontactsofrelay(RY-2)whichisoperatedbythe
controlunitwithina32secondtimebase.Microwavepower
operation is as follows:
VARI-MODE ON TIME OFF TIME
Power 10(P-HI) 32 sec. 0 sec.
(100% power)
Power 9(P-90) 30 sec. 2 sec.
(approx. 90% power)
Power 8(P-80) 26 sec. 6 sec.
(approx. 80% power)
Power 7(P-70) 24 sec. 8 sec.
(approx. 70% power)
Power 6(P-60) 22 sec. 10 sec.
(approx. 60% power)
Power 5(P-50) 18 sec. 14 sec.
(approx. 50% power)
Power 4(P-40) 16 sec. 16 sec.
(approx. 40% power)
Power 3(P-30) 12 sec. 20 sec.
(approx. 30% power)
Power 2(P-20) 8 sec. 24 sec.
(approx. 20% power)
Power 1(P-10) 6 sec. 26 sec.
(approx. 10% power)
Power 0(P-0) 0 sec. 32 sec.
(0% power)
Note: TheON/OFFtimeratiodoesnotcorrespondwiththe
percentageofmicrowavepower,becauseapprox.2
seconds are needed for heating of the magnetron
filament.

7
R-408EW
Figure O-2 Oven Schematic - Cooking Condition
Figure O-1 Oven Schematic - Off Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. Door Closed
2. CLOCK APPEARS ON DISPLAY
SCHEMATIC
3. VARIABLE COOKING CONTROL "HIGH"
2. COOKING TIME PROGRAMMED
1. DOOR CLOSED
NOTE: CONDITION OF OVEN
4. "START" PAD TOUCHED
Note:* Indicates component
120V AC
60 Hz
OVEN
LAMP TURN-
TABLE
MOTOR FAN
MOTOR
MONITOR
SWITCH
H.V. RECTIFIER MAGNETRON
SECONDARY
INTERLOCK
SWITCH
TTM
OL FM
MONITOR
FUSE 20A
CAVITY
TEMP.
FUSE
MAGNETRON
TEMP.
FUSE
A1
A2
COM.
COM.
COM.N.O.
N.C.
N.O.
DOOR
SENSING
SWITCH
(RY-1) (RY-2)
CONTROL UNIT
PRIMARY
INTERLOCK
RELAY
B1 B2
GRN
POWER
TRANSFORMER
CAPACITOR 1.0µF
AC 2300V
120V AC
60 Hz
OVEN
LAMP TURN-
TABLE
MOTOR FAN
MOTOR
MONITOR
SWITCH
H.V. RECTIFIER MAGNETRON
SECONDARY
INTERLOCK
SWITCH
TTM
OL FM
MONITOR
FUSE 20A
CAVITY
TEMP.
FUSE
MAGNETRON
TEMP.
FUSE
A1
A2
COM.
COM.
COM.N.O.
N.C.
N.O.
DOOR
SENSING
SWITCH
(RY-1) (RY-2)
CONTROL UNIT
PRIMARY
INTERLOCK
RELAY
B1 B2
GRN
POWER
TRANSFORMER
CAPACITOR 1.0µF
AC 2300V

8
R-408EW
6. Re-install the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
Key Unit
TEST PROCEDURES
PROCEDURE
LETTER COMPONENT TEST
JKEY UNIT TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable
ismakinggoodcontact,verifythatthedoorsensingswitch(stopswitch)operatesproperly;thatisthe
contactsareclosedwhenthedoorisclosedandopenwhenthedoorisopen.Ifthedoorsensingswitch
(stopswitch)isgood,disconnecttheflatribboncablethatconnectsthekeyunittothecontrolunitand
make sure the door sensing switch is closed (either close the door or short the door sensing switch
connecter).UsetheKeyunitmatrixindicatedonthecontrolpanelschematicandplaceajumperwire
betweenthepinsthatcorrespondtotheSTOP/CLEARpadmakingmomentarycontact.Ifthecontrol
unitrespondsbyclearingwithabeepthekeyunitisfaultyandmustbereplaced.Ifthecontrolunitdoes
not respond, it is faulty and must be replaced. If a specific pad does not respond, the above method
may be used (after clearing the control unit) to determine if the control unit or key pad is at fault.
5. Reconnect all leads removed from components during testing.
54321
09876
START POPCORN
POWER
LEVEL
MINUTE
PLUS
STEAKS
CHOPS
<COMPU
DEFROST>
GROUND
MEAT
REHEAT
CENTER
CHICKEN
PIECES
GROUND
MEAT
FROZEN
ENTREES
BAKED
POTATOES
STOP
CLEAR
TIMER
CLOCK
FRESH
VEGETABLES
FROZEN
VEGETABLES
G 8
G 9
G10
G11
G12
G13
G14
G 7 G 6 G 5 G 4 G 3 G 2 G 1

9
R-408EW
6
45
123
6
45
123
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-1. Pictorial Diagram
HIGH VOLTAGE CAPACITOR
HIGH VOLTAGE WIRE A
H.V. RECTIFIER
POWER SUPPLY CORD 120V 60Hz
HIGH VOLTAGE COMPONENTS
OVEN LAMP AND SOCKET
MAGNETRON
COM.
MONITOR SWITCH
COM.
N.O.
COM.
COM.
N.O.
N.O.
N.C.
DOOR SENSING SWITCH
SECONDARY INTERLOCK SWITCH
TURNTABLE MOTOR
NOTE:
Hot (ORG) wire must be connected to the terminal with blue mark on the oven light socket.
POWER TRANSFORMER
COM.
NO
NOTE:
The neutral (WHT/GRY) wire must
be connected to the terminal with
"N" mark on the power supply
cord.
RED
WHT
BRN
RED
WHT
WHT ORG
WHT
RED
BLK
RED
BLU
PNK
GRN
GRN
to Oven cavity
WHT
WHT
RED
BLK
WHT
WHT
BLUE MARK
WHT RED
WHT
CAVITY TEMP. FUSE MAGNETRON TEMP. FUSE
FAN MOTOR
MONITOR
FUSE
&
HOLDER
RED RED
WHT
1
WHT
GRY
WHT
ORG
BLU
GRN
ORG ORG
RY2
RY1
PRIMARY INTERLOCK RELAY
CN-A
CN-A
T1
1
12
2
CONTROL UNIT
(LSI UNIT)
(POWER UNIT)
HN
NOTE: The grounding conductor of the power supply cord has been grounded by power supply cord fixing screw. The screw must always be kept tight.
GRY
PNK
GRN
2 1
CN-B
CN-B
BRN
WHT

10
R-408EW
6
45
123
6
45
123
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-2. Power Unit Circuit
+
–
A 1
C 3
C 5
C 9
C 4
C 6
C 8
C 1
C 7
C 2
A 2
NO
NO
B 1
COM
COM
D1
S1NB10
T1
AC
AC
GND
VR
INT
BUZZER
MICRO
(BROWNER)
NC
DOOR
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
CN-C
9PIN LEAD WIRE
HARNESS
OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR
MICRO
DOOR
SENSING
SWITCH
CN-A
RY1
RY2
ab
c
d
(J1) VRS1
SP1 PKM22EPT
C1 2200µ/25v
10G471K
B 2
CN-B

11
R-408EW
6
45
123
6
45
123
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
Figure S-3. CPU Unit Circuit
+
–
+
–
C-3
G 9
G 8
5 4 3 2 1 0 9 8 7 6
G 7 G 6 G 5 G 4 G 3 G 2 G 1
G10 G11 G12 G13 G14
C-5 C-9 C-4 C-2 C-6 C-7 C-8 C-1
GND
C1 0.1µ/50v
C2 220µ/10v
ZD1
UDZ4.3B
C10
0.1µ
/50v
C40
0.01µ
/25v
10µ
/35v
C21
C3 0.01µ/25v
C20 0.1µ/50v
C60-65 330pF/50v
FROZEN
ENTREES
FRESH
VEGETABLES
FROZEN
VEGETABLES
CHICKEN
PIECES
<COMPU
DEFROST>
GROUND
MEAT
GROUND
MEAT
REHEAT
CENTER
STEAKS
CHOPS
BAKED
POTATOES
MINUTE
PLUS
POPCORN
POWER
LEVEL START
STOP
CLEAR
R68 15k R69 15k R70 15k R71 15k R72 15k R73 15k
CF1 CST4.00MGW
C4
0.01µ/25v
C11 0.01µ/25v
R30 3.3k
R40
R79 270k
R78 270k
R77 270k
R76 270k
R75 270k
R74 270k
R67
15k
R66
15k
R65
15k
R64
15k
R63
15k
R62
15k
R61
15k
R60
15k
C65
C64
C63
C62
C61
C60
R80
1M
4.7k
R2 4.7k
R1 82
R5 1k
R6 15k
R9 4.7k R8 4.7k R7 4.7k
R10 15k
R12 4.7k
R41 15k R90 15k
(J17) 4.7k(J16) 47k (J15) 4.7k (J13) 4.7k (J11) 4.7k
125
64 41
1 24
25 40
6580
(J14) (J12) (J10)
Q1 2SA1037AK
IC1 IXA096DR
Q30 DTA143EKA
Q20 DTA143EKA
Q22 DTA123JKA
D40 MA152WA
Q21 DTD143EKA
Q10 DTA143EKA
Q2 2SA1037AK
LD1 LD2 LD3 LD4
R4 560 1/2w
VR
INT BUZZER
OVEN LAMP TURNTABLE MOTOR FAN MOTOR
NC
(BROWNER) MICRO
NOTE
: IF NOT SPECIFIED 1/10W ± 5%
DOOR
SEG8
VL2 VL1
AN7 AN6 AN5 AN4 AN2 AN1 AN0
P57 P56 P55
CNTR0
P53 P52 P51 P50 P47 P46 P45 P44 P43
INT0
P63
SEG9
SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20
VL3
COM0
P41
P40
RESET
P71
P70
XIN
XOUT
VSS
P27
P26
P25
P24
P23
P22
P21
P20
COM1
COM2
SEG 1
SEG 2
SEG 3
SEG 4
SEG 5
SEG 6
SEG 7
SEG 8
SEG 9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
COM3
COM2
COM1
COM3
AVSS
VREF
VCC
SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG21
P06 P07 P10 P11 P12 P13 P14 P15 P16 P17
TIMER
CLOCK
COOK OZ.
CUPS
LBS.
NO.
DEFROST
LIQUID CRYSTAL DISPLAY
LSI UNIT
KEY UNIT
AUTO
D20 MA152WA
12k

12
R-408EW
REF. NO. PART NO. § DESCRIPTION Q'TY CODE
PARTS LIST
Note: The parts marked “∆∆
∆∆
∆” may cause undue microwave exposure.
The parts marked “*” are used in voltage more than 250V. "§" MARK: PARTS DELIVERY SECTION.
*
*
*
*
∆
∆
∆
∆
ELECTRIC PARTS
1- 1 RC-QZB018MRE0 M High voltage capacitor 1 AQ
1- 2 FH-DZB008MRY0 M High voltage rectifier assembly 1 AM
1- 3 QSOCLB006MRE0 M Oven lamp socket 1 AE
1- 4 RLMPTA068WRE0 M Oven lamp 1 AE
1- 5 RMOTEA346WRE0 M Fan motor 1 AR
1- 6 QFSHDB003MRE0 M Fuse holder 1 AD
1- 7 FFS-BA016/KIT M
Monitor switch (V-16G-2C25) and fuse assembly (20A 250V AC) 1AF
1- 8 QSW-MA085WRE0 M
Secondary interlock switch and door sensing switch (V-5230Q) 2AE
1- 9 QFS-TA013WRE0 M Magnetron temperature fuse 150OC 1AE
1-10 QFS-TA014WRE0 M Cavity temperature fuse 150OC 1AF
1-11 RV-MZA255WRE0 M Magnetron 1 BE
1-12 RMOTDA211WRE0 M Turntable motor 1 AL
1-13 RTRN-B064MRE0 M Power transformer 1 BA
1-14 FACCDB003MRE0 M Power supply cord 1 AM
CABINET PARTS
2- 1 GDAI-B057MRP0A M Base plate 1 BC
2- 2 GLEGPB004MRF0 M Foot 4 AB
2- 3 GCABUB093MRP0 M Outer case cabinet 1 BC
CONTROL PANEL PARTS
3- 1 DPWBFB099MRU0 M Power Supply unit 1 AW
3- 1A QCNCMA275DRE0 J 2-pin connector (CN-A) 1 AB
3- 1B QCNCMA275DRE0 J 2-pin connector (CN-B) 1 AB
3- 1C FW-VZB169MRE0 M 9Pin wire harness (CN-C) 1 AM
C1 RC-EZA333DRE0 J Capacitor 2200 uF 25V 1 AE
D1 RSRCDA013DRE0 J Diode bridge (S1NB10) 1 AG
RY1-2 RRLY-A114DRE0 J Relay (DU12D1-1PR(M)) 2 AN
SP1 RALM-A014DRE0 J Buzzer (PKM22EPT) 1 AG
T1 RTRNPB013MRE0 M Transformer 1 AK
T1 RTRNPA110DRE0 J Transformer (Interchangeable) 1 AP
VRS1 RH-VZB002MRE0 M Varistor (470ND-10D) 1 AB
VRS1 RH-VZA032DRE0 J Varistor (10G471K) (Interchangeable) 1 AE
3- 2 DPWBFC163WRKZ M LSI unit 1 AX
3- 3 FPNLCB343/KIT M Control panel frame with key unit 1 AV
3- 4 FUNTKB307/KIT M Key unit 1 AL
3- 5 JBTN-B102MRF0 M Open button 1 AE
3- 6 MSPRTA050WRE0 M Open button spring 1 AA
3- 7 PSHEPB023MRE0 M LED sheet 1 AR
3- 8 LHLD-B007MRF0 M LCD holder 1 AD
3- 9 XEPSD30P10XS0 M Screw; 3mm x 10mm 3 AA
OVEN PARTS
4- 1 LBNDKB007MRP0 M H.V. Capacitor band 1 AB
4- 2 LANGTB048MRP0 M Chassis support 1 AE
4- 3 PHOK-B018MRF0 M Latch hook 1 AF
4- 4 MLEVPB016MRF0 M Switch lever 1 AD
4- 5 PDUC-B104MRF0 M Magnetron duct 1 AG
4- 6 NFANPB006MRE0 M Fan blade 1 AC
4- 7 PDUC-B088MRF0 M Fan duct 1 AC
4- 8 ------------- M Oven cavity (Not a replaceable part) 1 --
4- 9 PCOVPB085MRP0 M Waveguide cover 1 AV
4-10 PPACGB014MRF0 M Turntable motor packing 1 AA
4-11 PCUSUB033MRP0 M Cushion 1 AA
DOORPARTS
5 -1 FCOV-B183MRK0 M Door frame assembly 1 AV
5 -2 LSTPPB021MRF0 M Latch head 1 AE
5 -3 MSPRTA046WRE0 M Latch spring 1 AB
5 -4 FDORFB062MRT0 M Door panel 1 AV
5- 5 PSHEPB021MRE0 M Sealer film 1 AE
5- 6 GCOVHB042MRF0 M Choke cover 1 AC
5- 7 LSTPPB036MRT0 M Door glass stopper 1 AK
5- 8 PGLSPB027MRE0 M Door glass 1 AQ
5- 9 XEPSD30P06XS0 M Door screw 1 AA
5- 10 HDECQB029MRF0 M Door trim 1 AE

13
R-408EW
HOW TO ORDER REPLACEMENT PARTS
To have your order filled promptly and correctly, please furnish the following information.
1. MODEL NUMBER
2. REF. NO.
3. PART NO.
4. DESCRIPTION
Order Parts from the authorized SHARP parts Distributor for your area.
Defective parts requiring return should be returned as indicated in the Service Policy.
REF. NO. PART NO. § DESCRIPTION Q'TY CODE
MISCELLANEOUS
6- 1 FW-VZB125MRE0 M Stop switch harness 1 AF
6- 2 FW-VZB168MRE0 M Main wire harnes 1 AU
6- 3 TLABBB007MRE0 M Cavity hole cover 1 AA
6- 4 FROLPB025MRK0 M Turntable support 1 AN
6- 5 NTNT-A095WRE0 M Turntable tray 1 AN
6- 6 TCAUAB037MRR0 M Monitor caution label 1 AA
6- 7 TCAUAB038MRR0 M DHHS/Screw caution label 1 AB
6- 8 TINSEB284MRK0 M Operation manual 1 AD
6- 9 QW-QZB016MRE0 M High voltage wire A 1 AC
SCREWS,NUTSANDWASHERS
7- 1 LX-BZA041WRE0 M Special screw 5 AA
7- 2 LX-CZ0052WRE0 M Special screw 2 AA
7- 3 XHTSD40P12RV0 M Screw : 4mm x 12mm 1 AA
7- 4 XOTSD40P12000 M Screw : 4mm x 12mm 6 AA
7- 5 XCBSD30P08000 M Screw : 3mm x 8mm 3 AA
7- 6 LX-CZA038WRE0 M Special screw 2 AA
7- 7 XHTSD40P08RV0 M Screw : 4mm x 8mm 3 AA
7- 8 LX-CZA070WRE0 M Special screw (Torx tamper proof screw) 2 AB
7- 9 XOPSD40P12XS0 M Special screw 1 AB

14
R-408EW
6
45
123
6
45
123
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
OVEN AND CABINET PARTS
2-3
4-7
6-7
1-5
4-6
4-8
4-9
6-3
6-5
6-4 2-1
7-5
1-12
4-10
7-2
7-2
4-3
1-13
1-10
7-3
7-5
7-5
1-9
7-7
7-7
4-2
7-9
1-11
1-3
1-4
7-1
1-8
1-8
4-4
7-1
4-1
1-1
1-2
2-2
2-2
2-2
2-2
7-4
7-4 4-11
7-4
6-6
1-7
1-6
4-5
1-14
7-8
7-6
7-8
7-6

15
R-408EW
6
45
123
6
45
123
A
B
C
D
E
F
G
H
A
B
C
D
E
F
G
H
CONTROL PANEL PARTS
DOOR PARTS
Actual wire harness may be different from illustration.
6-9
6-2
6-1
5-5
5-6
5-4
5-7
5-2
5-9
5-1
5-3
5-8
3-4
3-3
3-7
3-8
3-9
3-9 3-9
3-1
3-2
3-6
3-5
5-10

16
R-408EW
PACKING AND ACCESSORIES
DOOR PROTECTION SHEET
PLASTIC BAG
PACKING CASE
TOP PAD ASSEMBLY
IN
T
O
TH
EOV
E
NC
AV
I
TY
6-5 TURNTABLE TRAY
6-4 TURNTABLE SUPPORT
6-8 OPERATION MANUAL
TRAY PACK
BOTTOM PAD ASSEMBLY
TRAY HOLDER
None-Replaceable items

17
R-408EW
NOTES:

18
R-408EW
2001SHARPCORP.(9M2.61E)PrintedinU.S.A
COPYRIGHT©2001BYSHARPCORPORATION
ALL RIGHTS RESERVED.
No part of this publication may be repro-
duced, stored in retrieval systems, or trans-
mitted in any form or by any means, elec-
tronic,mechanical,photocopying,recording,
orotherwise,withoutpriorwrittenpermission
of the publisher.