Sharp R-303CW User Manual

Name: Sharp R-303CW
Brand: Sharp
SKU: 2568571
Rating: 4.5 (2 reviews)

4.5 (2)

R-303CW

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

FOREWORD AND WARNING...............................................................................................................................2

PRODUCT SPECIFICATIONS ..............................................................................................................................3

SCHEMATIC DIAGRAM ........................................................................................................................................4

TEST PROCEDURE ..............................................................................................................................................5

POWER UNIT CIRCUIT ........................................................................................................................................7

CPU UNIT CIRCUIT ..............................................................................................................................................8

PRINTED WIRING BOARD ...................................................................................................................................9

PARTS LIST ........................................................................................................................................................10

PACKING AND ACCESSORIES .........................................................................................................................11

S3905R303CPW/

MICROWAVE OVEN

MODEL

R-303CW

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 con-

tain 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..)

SHARP CORPORATION

This document has been published to be used for after

sales service only.

The contents are subject to change without notice.

SUPPLEMENTAL SERVICE MANUAL

This is a supplemental Service Manual for Model R-303CW. This model is quite similar to base

model R-308CW. Use this supplemental manual together with the Base Model Service Manual

(Refer No. is S1901R310CPW/) for complete operation, service information, etc..

1 Ground Meat

2 Steaks/Chops

3 Chicken Pieces

COMPU 

DEFROST

Power

Level

Timer

Clock

INSTANT ACTION

123

456

TO ADJUST QUANTITY - TOUCH PAD AGAIN

Stop

Clear

START

DEFOST

COOK

NO.

LBS.

CUPS.

OZ.

MINUTE 

PLUS

Dinner

Plate

Casserole

Popcorn

Baked

Potatoes

Fresh

Vegetables

Frozen

Entress

Frozen

Vegetables

Rolls/

Muffins

Beverage

R-303CW

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.

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 The 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/cm

. The owner of the unit should be instructed not to use the unit

until the oven has been brought into compliance.

R-303CW

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)

High Voltage Capacitor, High Voltage Power Trans-

former, Magnetron, High Voltage Rectifier Assem-

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

seconds after the oven has been switched off. Wait for 60

seconds and then short-circuit the connection of the high-

voltage capacitor (that is the connecting lead of the high-

voltage 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 run 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 re-

examine 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.

Don't Touch !

Danger High Voltage

R-303CW

SHARP ELECTRONICS CORPORATION

SHARP PLAZA, MAHWAH,

NEW JERSEY 07430-2135

SERVICE MANUAL

MICROWAVE OVEN

R-303CW

FOREWORD

This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service

Information for the SHARP MICROWAVE OVEN, R-303CW.

The model R-303CW is quite similar to base model R-308CW (Refer No. is S1901R310CPW/).

It is recommended that service personnel carefully study the entire text of this manual and the base model's 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.

(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 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.

R-303CW

ITEM DESCRIPTION

Power Requirements 120 Volts / 13 Amperes

60 Hertz

Single phase, 3 wire grounded

Power Output 1100 watts (IEC-705 TEST PROCEDURE)

Operating frequency of 2450MHz

Case Dimensions Width 20-1/2"

Height 11-7/8"

Depth 16-7/8"

Cooking Cavity Dimensions Width 14-3/4"

Height 8-3/4"

1.1 Cubic Feet Depth 15-3/4"

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

MINUTE PLUS pads

INSTANT START pads

COMPU DEFROST pads

Number selection pads

Power Level pad, Timer/Clock pad

Stop/Clear pad, START pad

Oven Cavity Light Yes

Safety Standard UL Listed FCC Authorized

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

SPECIFICATION

+ 11 hidden pages