SHARP R408EW Service Manual

SUPPLEMENTAL SERVICE MANUAL

S91M174R408EE

MICROWAVE OVEN

R-408EW

MODELS

R-408EW

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.

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..)

TABLE OF CONTENTS

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

TOUCH CONTROL PANEL....................................................................................................................................8

PICTORIAL DIAGRAM ..........................................................................................................................................9

POWER UNIT CIRCUIT.......................................................................................................................................10

CPU UNIT CIRCUIT.............................................................................................................................................11

PARTS LIST........................................................................................................................................................12

PACKING AND ACCESSORIES .........................................................................................................................16

R-408EW

Page

SHARP ELECTRONCS CORPORATION

Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135

This document has been published to be used for after
sales service only.
The contents are subject to change without notice.

R-408EW

PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE
EXPOSURE 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)
seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and
latches, (5) evidence of dropping or abuse.

(c) Before turning on microwave power for any service test or inspection within the microwave generating

compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.

(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
manual before the oven is released to the owner.

(e ) A microwave leakage check to verify compliance with the Federal Performance Standard should be

performed on each oven prior to release 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
ELECTRONICS CORPORATION immediately @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.

WARNING TO SERVICE PERSONNEL

Microwave ovens contain circuitry capable of pro­ducing very high voltage and current, contact with
following parts
fatal, electrical shock.

(Example)
High Voltage Capacitor, High Voltage Power Trans-

former, Magnetron, High Voltage Rectifier Assem­bly, High Voltage Harness etc..

Read the Service Manual carefully and follow all
instructions.

may result in a severe, possibly

R-408EW

Don't Touch !
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 high voltage capacitor.

WARNING:RISK OF ELECTRIC SHOCK.

DISCHARGE THE HIGH-VOLTAGE
CAPACITOR BEFORE SERVICING.

The high-voltage capacitor remains charged about 60
seconds after the oven has been switched off. Wait for 60
seconds and then short-circuit the connection of the high­voltage capacitor (that is the connecting lead of the high­voltage rectifier) against the chassis with the use of an
insulated screwdriver.

Whenever troubleshooting is performed the power supply
must be disconnected. It may, in some cases, be necessary
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. Reconnect the power supply cord after the outer case is
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. Reconnect the power supply cord after the outer case is
installed.

4. 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 that the water is now hot. If the water
remains cold carry out Before Servicing procedure and re­examine the connections 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 a microwave leakage test should be carried out.

1

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
should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition
by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external
surface of the oven.

2) Safety interlock switches, primary interlock relay and door sensing 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/cm2 at 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±5

O

C (68OF) in the center of the oven cavity.
The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.) and
made of an electrically nonconductive material such as glass or plastic.
The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakage
is measured accurately.

4) Set the cooking control on Full Power Cooking Mode.

5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed, replace
it with 275 ml of cool water.

C. 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 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication on the
meter.

3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metal
has been breached (eg., around the switches, indicator, and vents).
While testing for leakage around the door, pull the door away from the front of the oven as far as is permitted by the closed
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.

2

SUPPLEMENTAL SERVICE MANUAL

R-408EW

MICROWAVE OVEN

R-408EW

FOREWORD

This Manual has been prepared to provide Sharp Electronics Corp.
Service Personnel with Operation and Service Information for the SHARP
MICROWAVE OVEN, R-408EW.

The model R-408EW is quite similar to base models R-409EW/R-410EK/
EW (Ref.# S21M160R409EE).

It is recommended that service personnel carefully study the entire text of
this manual so that they will be qualified to render satisfactory customer
service.

Check the interlock switches and the door seal carefully. Special attention
should be given to avoid electrical shock and microwave radiation hazard.

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.

PRODUCT DESCRIPTION

GENERAL INFORMATION

OPERATION

TROUBLESHOOTING GUIDE AND
TEST PROCEDURE

TOUCH CONTROL PANEL

COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE

WIRING DIAGRAM

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 person­nel - 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.

SHARP ELECTRONICS CORPORATION

PARTS LIST

SHARP PLAZA, MAHWAH,

NEW JERSEY 07430-2135

3

R-408EW

SPECIFICATION

ITEM DESCRIPTION

Power Requirements 120 Volts

13.8 Amperes, 1650 watts
60 Hertz
Single phase, 3 wire grounded

Power Output 1200 watts (IEC 705 TEST PROCEDURE)

Operating frequency of 2450MHz

Case Dimensions Width 21-21/32"

Height 12-3/8"
Depth 18-7/16"

Cooking Cavity Dimensions Width 15-23/32"

Height 9-21/32"

1.6 Cubic Feet Depth 17-7/8"
Control Complement Touch Control System

Clock ( 1:00 - 12:59 )
Timer (0 - 99 min. 99 seconds)

Microwave Power for Variable Cooking
Repetition Rate;

P-HI .................................................. Full power throughout the cooking 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 power throughout the cooking time

BEVERAGE pad, POPCORN pad, MINUTE PLUS pad, INSTANT ACTION pads
COMPU DEFROST pads, Number selection pads Power Level pad, Timer/Clock
pad,Stop/Clear pad, START pad, Keep warm & Reheat

Oven Cavity Light Yes
Safety Standard UL Listed FCC Authorized

DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J

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.
In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for the electric
current.

WARNING: Improper use of the grounding plug can result in a risk of electric shock.

Electrical Requirements
The electrical requirements are a 120 volt 60 Hz, AC only,
15 or 20 amp. fused electrical supply. It is recommended that a separate circuit serving only this appliance be provided. 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.
Where a two-pronged wall-receptacle is encountered, it is the personal responsibility and obligation of the customer to contact

4

R-408EW

a qualified electrician and have it replaced with a properly grounded
three-pronged wall receptacle or have a grounding adapter properly
grounded and polarized. If the extension cord must be used, it should be
a 3-wire, 15 amp. or higher rated cord. Do not drape over a countertop
or table where it can be pulled on by children or tripped over accidentally.

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.

TOUCH CONTROL PANEL

10.Wave guide cover.

11.Power supply cord

6

2

10

3

4

5

Grounded
Receptacle Box

3-Pronged
Plug

Grounding Pin

3-Pronged Receptacle

7

11

9

8

1

NOTE:
The directed features are disa­bled 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

5

R-408EW

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

The following is a description of component functions during
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. The display will show flashing "88:88".
To set any program or set the clock, you must first touch
the STOP/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 and is mechanically associated with the door so that
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) remains closed. Then the monitor switch contacts
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.
If the secondary interlock switch and primary interlock relay
(RY2) fail with the contacts closed when the door is opened,
the closing of the monitor switch contacts will form a short
circuit through the monitor fuse, secondary interlock switch,
relay (RY1) and primary interlock relay (RY2), causing the
monitor fuse to blow.

POWER LEVEL P-0 TO P-90 COOKING

When Variable Cooking Power is programmed, the 120 volts
A.C. is supplied to the power transformer intermittently
through the contacts of relay (RY-2) which is operated by the
control unit within a 32 second time base. Microwave power
operation is as follows:

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. The filament winding voltage heats the magnetron filament
and the H.V. winding voltage is sent to a voltage doubler
circuit.

4. The microwave energy produced by the magnetron is
channelled through the waveguide into the cavity feed­box, 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. When the door is opened during a cook cycle, the monitor
switch, door sensing switch, secondary interlock switch,
relay (RY1) and primary interlock relay are activated with
the following results. The circuits to the turntable motor,
the cooling 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. The monitor switch electrically monitors the operation of
the secondary interlock switch and primary interlock

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: The ON/OFF time ratio does not correspond with the

percentage of microwave power, because approx. 2
seconds are needed for heating of the magnetron
filament.

6

R-408EW

SCHEMATIC

NOTE: CONDITION OF OVEN

1. Door Closed

2. CLOCK APPEARS ON DISPLAY

120V AC
60 Hz

MAGNETRON
TEMP.
FUSE

GRN

CAVITY
TEMP.
FUSE

MONITOR
FUSE 20A

A2

A1

CONTROL UNIT

OL FM

OVEN
LAMP

SECONDARY
INTERLOCK
SWITCH

Note:* Indicates component

(RY-1)

TTM

TURN­TABLE
MOTOR

COM.

FAN
MOTOR

N.O.

COM.N.O.

B1 B2

(RY-2)

PRIMARY
INTERLOCK
RELAY

DOOR
SENSING
SWITCH

N.C.

COM.

MONITOR
SWITCH

CAPACITOR 1.0µF
AC 2300V

POWER
TRANSFORMER

H.V. RECTIFIER

MAGNETRON

Figure O-1 Oven Schematic - Off Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. COOKING TIME PROGRAMMED

3. VARIABLE COOKING CONTROL "HIGH"

4. "START" PAD TOUCHED

120V AC
60 Hz

MAGNETRON
TEMP.
FUSE

GRN

CAVITY
TEMP.
FUSE

MONITOR
FUSE 20A

A2

A1

CONTROL UNIT

OL FM

OVEN
LAMP

SECONDARY
INTERLOCK
SWITCH

(RY-1)

TTM

TURN­TABLE
MOTOR

COM.

FAN
MOTOR

N.O.

COM.N.O.

B1 B2

(RY-2)
PRIMARY

INTERLOCK
RELAY

DOOR
SENSING
SWITCH

N.C.

COM.

MONITOR
SWITCH

CAPACITOR 1.0µF
AC 2300V

POWER
TRANSFORMER

H.V. RECTIFIER

MAGNETRON

Figure O-2 Oven Schematic - Cooking Condition

7

R-408EW

TEST PROCEDURES

PROCEDURE

LETTER

J KEY UNIT TEST

COMPONENT 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
is making good contact, verify that the door sensing switch (stop switch) operates properly; that is the
contacts are closed when the door is closed and open when the door is open. If the door sensing switch
(stop 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 short the door sensing switch
connecter). 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 beep the key unit is faulty and must be replaced. If the control unit does
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.

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.

G 7 G 6 G 5 G 4 G 3 G 2 G 1

G 8

G 9

G10

G11

G12

21

5

3

4

09876

FROZEN

ENTREES

POWER

LEVEL

STOP

CLEAR

POPCORN

BAKED

POTATOES

START

MINUTE

PLUS

FRESH

VEGETABLES

TIMER

CLOCK

FROZEN

VEGETABLES

STEAKS

CHOPS

REHEAT
CENTER

CHICKEN

PIECES

<COMPU

DEFROST>

GROUND

MEAT

GROUND

MEAT

G13

G14

Key Unit

8

R-408EW

1

2

3

45

A

HIGH

VOLTAGE

CAPACITOR

FAN MOTOR

POWER SUPPLY

GRY

CORD 120V 60Hz

NOTE:

The neutral (WHT/GRY) wire must

WHT

be connected to the terminal with

"N" mark on the power supply

cord.

ORG

ORG

HIGH VOLTAGE

WIRE A

H.V. RECTIFIER

POWER

TRANSFORMER

N

B

H

RED

WHT

6

A

B

HIGH VOLTAGE COMPONENTS

BLUE MARK

NOTE:

The grounding conductor of

the power supply cord has

been grounded by power

supply cord fixing screw.

The screw must always be

C

kept tight.

RED

RED

MAGNETRON TEMP. FUSE

ORG

WHT

OVEN LAMP

Hot (ORG) wire must be

NOTE:

AND SOCKET

connected to the terminal

with blue mark on the oven

light socket.

D

MAGNETRON

TURNTABLE

MOTOR

RED

BRN

WHT

WHT

C

WHT

D

WHT

E

F

G

CAVITY TEMP. FUSE

WHT

N.O.

DOOR

PNK

GRN

COM.

SENSING

SWITCH

GRN

to Oven cavity

CONTROL UNIT

(LSI UNIT)

GRN

GRN
2

PNK

CN-B

1

CN-B

12

WHT

CN-A

1

COM.

(POWER UNIT)

N.O.

RY1

E

RED

&

FUSE

HOLDER

MONITOR

BLK

Figure S-1. Pictorial Diagram

WHT

WHT

GRY

WHT

WHT

WHT

COM.

MONITOR

N.C.

RED

BLU

BRN

RED

RED

COM.

T1

N.O.

RY2

PRIMARY

INTERLOCK

1

RELAY

2

CN-A

SWITCH

NO

COM.

SECONDARY

INTERLOCK

SWITCH

F

G

BLK

H

1

2

3

ORG

BLU

45

H

6

9

R-408EW

1

A

B

C

AC

A 1

2

T1

3

D1
S1NB10

CN-A

A 2

VRS1

10G471K

d

a

b

45

CN-C
9PIN LEAD WIRE
HARNESS

C 3

GND

+
–

C1 2200µ/25v

C 5

VR

6

A

B

C

D

OVEN LAMP
TURNTABLE
MOTOR
FAN MOTOR

E

AC

MICRO

NO

COM

NO

COM

F

DOOR
SENSING
SWITCH

CN-B

G

B 1

B 2

(J1)

c

SP1 PKM22EPT

C 9

INT

RY1

C 4

BUZZER
OVEN LAMP

TURNTABLE

C 6

MOTOR

RY2

C 8

C 7

C 2

C 1

FAN MOTOR
MICRO

(BROWNER)

NC

DOOR

D

E

F

G

H

H

Figure S-2. Power Unit Circuit

1

2

3

45

6

10

R-408EW

1

A

NO.

LBS.

CUPS

B

LIQUID CRYSTAL DISPLAY

C

D

E

LSI UNIT

OZ.

AUTO

DEFROST

COOK

R5 1k

+

125

COM1
COM2
COM3
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG 9
SEG 8
SEG 7
SEG 6
SEG 5
SEG 4
SEG 3
SEG 2
SEG 1

R8 4.7k R7 4.7k

0.01µ/25v
C4

Q2

2SA1037AK

C3 0.01µ/25v

C2 220µ/10v

–

2

R9 4.7k

R6 15k

UDZ4.3B
ZD1

(J13) 4.7k

(J11) 4.7k

12k

(J12)

(J10)

R10 15k

64

SEG8

SEG9

6580

SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0

VCC

VREF
AVSS
COM3
COM2
COM1
COM0

VL3

VL2

VL1

1

(J17) 4.7k(J16) 47k

(J15) 4.7k

(J14)

C11 0.01µ/25v

SEG10

AN7

SEG11

AN6

SEG12

AN5

SEG13

AN4

SEG14

P63

SEG15

AN2

3

SEG16

AN1

SEG17

AN0

SEG21

SEG18

SEG19

SEG20

IC1

IXA096DR

P57

P56

P55

CNTR0

45

15k
R60

MEAT

MEAT

<COMPU

PIECES

CHICKEN

15k
R61

15k
R62

PLUS

MINUTE

15k
R63

15k

P06

P07

P10

P11

P12

P53

P52

P51

P50

P47

41

P13

P14

P15

P16

P17

P20
P21
P22
P23
P24
P25
P26
P27

VSS

XOUT
XIN
P70
P71

RESET
P40
P41

P46

P45

25 40

P44

P43

INT0

24

R64

15k
R65

15k
R66

15k
R67

G 7 G 6 G 5 G 4 G 3 G 2 G 1

G 8

5 4 3 2 1

GROUND

DEFROST>

CHOPS

STEAKS

REHEAT

CENTER

FRESH

TIMER

CLOCK

VEGETABLES

START

POPCORN

LEVEL

POWER

0 9 8 7 6

FROZEN

ENTREES

GROUND

FROZEN

VEGETABLES

BAKED

POTATOES

STOP

CLEAR

6

KEY UNIT

A

B

C

R90 15k

G 9

G10

G11

G12

G13

G14

1M

R80

CF1 CST4.00MGW

C60-65 330pF/50v

C60
C61
C62
C63
C64
C65

D

R74 270k
R75 270k
R76 270k
R77 270k
R78 270k

/25v

0.01µ
C40

R79 270k

R68 15k

R69 15k

R70 15k

R71 15k

R72 15k

R73 15k

E

Figure S-3. CPU Unit Circuit

Q10

DTA143EKA

F

G

R2 4.7k

R1 82

R12 4.7k

Q1

LD1 LD2 LD3 LD4

C1 0.1µ/50v

2SA1037AK

R4 560 1/2w

/50v

0.1µ
C10

R30 3.3k

Q30

C20 0.1µ/50v

DTA143EKA

Q21

DTD143EKA

Q20

DTA143EKA

/35v
10µ

–

+

C21

D20

C-3

C-5

C-9

C-4

C-2

C-6

C-7

H

GND

1

VR

2

INT

BUZZER

NC

3

OVEN LAMP

TURNTABLE

MOTOR

FAN MOTOR

(BROWNER)

R41 15k

4.7k

R40

Q22

DTA123JKA

: IF NOT SPECIFIED 1/10W ± 5%

D40

MA152WA

MA152WA

C-8

MICRO

C-1

DOOR

45

NOTE

F

G

H

6

11

R-408EW

PARTS LIST

Note: The parts marked “

The parts marked “*” are used in voltage more than 250V. "§" MARK: PARTS DELIVERY SECTION.

REF. NO. PART NO. § DESCRIPTION Q'TY CODE

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
1- 8 QSW-MA085WRE0 M
1- 9 QFS-TA013WRE0 M Magnetron temperature fuse 150
1-10 QFS-TA014WRE0 M Cavity temperature fuse 150
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

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

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

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

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

∆∆

∆” may cause undue microwave exposure.

∆∆

ELECTRIC PARTS

Monitor switch (V-16G-2C25) and fuse assembly (20A 250V AC)
Secondary interlock switch and door sensing switch (V-5230Q)

O

C 1AF

CABINET PARTS

CONTROL PANEL PARTS

OVEN PARTS

DOOR PARTS

O

C 1AE

1AF
2AE

12

R-408EW

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,NUTS AND WASHERS

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

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.

13

R-408EW

1

OVEN AND CABINET PARTS

A

B

C

2

3

45

6

7-8

A

7-8

7-6

2-3

B

4-7

7-6

7-5

1-10

6-7

C

1-5

4-6

1-14

7-3

7-5

D

4-8

7-7

7-7

1-9

D

4-2

7-9

1-11

E

F

4-9

6-4

6-5

2-1

6-3

1-12

7-5

4-10

1-13

7-2

7-2

4-3

6-6

7-1

4-4

1-8

1-8

1-6

7-1

1-3

1-4

4-5

1-7

E

F

4-1

1-1

G

1-2

G

7-4

2-2

7-4

2-2

2-2

7-4

4-11

2-2

H

1

2

3

45

6

H

14

R-408EW

1

CONTROL PANEL PARTS

A

3-3

B

3-5

C

3-6

2

3

45

6

A

3-2

3-9

3-8

3-7

3-4

3-9

3-1

3-9

B

C

DOOR PARTS

D

5-5

5-4

5-8

5-7

E

5-1

5-9

5-6

F

5-2

5-10

5-3

6-1

G

6-2

D

E

F

G

6-9

Actual wire harness may be different from illustration.

H

1

2

3

45

6

H

15

R-408EW

PACKING AND ACCESSORIES

TOP PAD ASSEMBLY

DOOR PROTECTION SHEET

PLASTIC BAG

TRAY HOLDER

6-5 TURNTABLE TRAY

6-8 OPERATION MANUAL

6-4 TURNTABLE SUPPORT

TRAY PACK

T

IN

PACKING CASE

TY

I

AV

NC

E

EOV

TH

O

BOTTOM PAD ASSEMBLY

None-Replaceable items

16

NOTES:

R-408EW

17

R-408EW

COPYRIGHT © 2001 BY SHARP CORPORATION

ALL RIGHTS RESERVED.

No part of this publication may be repro­duced, stored in retrieval systems, or trans­mitted in any form or by any means, elec­tronic, mechanical, photocopying, recording,
or otherwise, without prior written permission
of the publisher.

18

2001 SHARP CORP. (9M2.61E) Printed in U.S.A