Sharp R-7280 User Manual

R-7280
R-1720
.
SHARP SERVICE MANUAL
S6703R7280J//
MICROWAVE OVEN
MODELS R-7280
R-l 720
Photo R-7280
in the interests of user-safety the set should be restored to its original
condition and only parts identical to those specified should be used.
( RD16101 U)
TABLE OF CONTENTS
FOREWORD
Page
. . . . . . . . . . . ..*.....*...........*................*......................................................................................................
I
CAUTION, MICROWAVE RADIATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*...........................*..........
1
PRODUCT DESCRIPTION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*.......*..........................
2
OPERATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..I.................................................................................................
4
SERVICING
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*......................................................................
7
TOUCH CONTROL PANEL ASSEMBLY
. . . . . . . . . . . . . . . . . . . . . . . * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14
COMPONENT
REPLACEMENT
AND
ADJUSTMENT PROCEDURE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
MICROWAVE MEASUREMENT PROCEDURE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25
PICTORIAL DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..........
26
CONTROL PANEL CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..a.... . . . ..a..... . . . . . . . ..,.....a... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27
PRINTED WIRING BOARD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..~.............................................................
PARTS LIST
28
*........................................................................................................,.......................................... 29
PACKING AND ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
SHARPCORPORATION

Sharp R-7280 Specifications

General

Type	Microwave Oven
Turntable	Yes
Display	Digital
Cooking Modes	Microwave
Control Type	Touch

Summary

Foreword

Microwave Radiation Safety

Crucial safety precautions regarding exposure to microwave energy.

Product Description

Product Specifications

Oven Operation

Operating Sequence Description

Component Test Procedures

Magnetron and High Voltage Circuit Tests

Tests for magnetron, power transformer, rectifier, HV capacitor, and fuses.

Switch and Monitor Tests

Procedures for testing various switches and the monitor switch.

Touch Control Panel Test

Troubleshooting and testing the touch control panel assembly.

Servicing

Handling Electronic Components

Precautions for handling sensitive electronic components like PMOS LSI.

Servicing Touch Control Panel

Component Replacement and Adjustment

Outer Case and High Voltage Components Removal

Power Transformer and Magnetron Removal

Control Panel Assembly Removal

Latch Switches and Door Adjustment

Adjusting latch switches and door alignment for proper operation.

Microwave Measurement

Leakage Testing Procedure

Procedure for measuring microwave radiation leakage from the oven.

Parts List

Control Panel Parts