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CAUTION, MICROWAVE RADIATION .......................................................................... Inside front cover
WARNING ................................................................................................................................................. 3
SERVICING ............................................................................................................................................. 4
GENERAL INFORMATION ....................................................................................................................... 6
PRODUCT SPECIFICATIONS/ TEST DATA AT A GLANCE ................................................................... 7
APPEARANCE VIEW .............................................................................................................................. 7
OPERATION SEQUENCE ........................................................................................................................ 9
FUNCTION OF IMPORTANT COMPONENTS ..................................................................................... 11
TROUBLESHOOTING GUIDE ............................................................................................................... 13
TEST PROCEDURE .............................................................................................................................. 14
CONTROL PANEL ASSEMBLY ............................................................................................................ 21
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE .................................................. 26
MICROWAVE MEASUREMENT ........................................................................................................... 32
SCHEMATIC DIAGRAM ........................................................................................................................ 36
PICTORIAL DIAGRAM .......................................................................................................................... 36
POWER UNIT CIRCUIT DIAGRAM ........................................................................................................ 37
PRINTED WIRING OF JOG SWITCH UNIT ........................................................................................... 38
PRINTED WIRING BOARD OF JOG SWITCH UNIT ............................................................................. 38
CPU UNIT CIRCUIT OF POWER UNIT ................................................................................................. 39
PRINTED WIRING BOARD OF POWER UNIT ...................................................................................... 40
PARTS LIST .......................................................................................................................................... 41
EXPLODED DIAGRAMS ........................................................................................................................ 43
SERVICE MANUAL
®
MODELS
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
SHARP CORPORATION
R-775(W)R-785(AL) - 1
MICROWAVE OVEN WITH
TOP AND BOTTOM GRILLS
R-775(W)
R-785(AL)
S50220R775EHW
Page
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Summarization of Contents
General Important Information
Microwave Radiation Caution
Warning about potential exposure to microwave radiation from the generator or parts.
General Warnings and Safety
Warnings regarding voltage, door closure, and service personnel safety.
Servicing Procedures
Service Personnel Safety Warning
Warning about high voltage and current exposure risk to service personnel.
Servicing Safety Precautions
Safety steps for servicing, including high voltage capacitor discharge.
General Information
Earthing Requirement Warning
Warning that the appliance must be earthed for electrical safety.
Product Description
Specifications and Test Data
Technical specifications, including power, dimensions, and key test data.
Appearance View
Control Panel Overview
Diagram and description of control panel buttons and indicators.
Operation Sequence
Microwave Cooking and Monitor Circuit
Steps for microwave cooking and explanation of the monitor switch circuit.
Operation Sequence
Cooking Modes and Power Ratios
Details on variable power, grill, and dual cooking modes with power ratios.
Operation Sequence
Automatic Cooking Functions
Explanation of automatic cooking functions like Auto Cook and Express Pizza.
Function of Important Components
Door Mechanism and Switches
Description of door opening mechanism, monitored latch, stop, and monitor switches.
Function of Important Components
Component Descriptions
Descriptions of key components like fuses, transformers, motors, and heating elements.
Test Procedures
Magnetron and Output Power Tests
Procedures for testing magnetron and measuring microwave output power.
Test Procedures
High Voltage Component Tests
Tests for high voltage transformer, rectifier, and capacitor.
Test Procedures
Switch and Thermal Cut-out Tests
Procedures for testing switches and thermal cut-outs.
Test Procedures
Motor, Filter, and Fuse Tests
Tests for motor windings, noise filter, and fuses.
Test Procedures
Heating Element and Control Panel Tests
Tests for heating elements and control panel assembly.
Control Panel Assembly Test
Jog Switch and Control Unit Faults
Symptoms indicating faults in jog switch unit and control unit.
Test Procedures
Jog Switch Unit and Relay Tests
Procedures for testing jog switch unit and relays.
Test Procedures
PWB Foil Pattern Troubleshooting
Troubleshooting steps for an open foil pattern on the PWB.
Touch Control Panel Assembly
Control Panel Unit Overview and Details
Overview of control panel units and their functions.
Description of LSI
LSI Signal Descriptions
Detailed table of LSI input/output signals and their functions.
Servicing Precautions
Handling Electronic Components
Precautions for handling CMOS LSI, static electricity, and soldering.
Touch Control Panel Servicing
Procedures and precautions for servicing the touch control panel.
Component Replacement Procedure
Wiring and Outer Case Removal
Safety measures for wiring and steps for removing the outer case.
High Voltage Component Removal
Procedures for removing high voltage components like capacitors and rectifiers.
Component Replacement Procedure
Transformer, Magnetron, Control Panel Removal
Procedures for removing transformer, magnetron, and control panel assembly.
Component Replacement Procedure
Motor Replacement (Fan and Turntable)
Step-by-step procedures for replacing the fan and turntable motors.
Component Replacement Procedure
Oven Lamp, Power Cord, Heating Element Replacement
Procedures for replacing the oven lamp, power cord, and heating elements.
Component Replacement Procedure
Door Switch Removal and Adjustment
Procedure for removing and adjusting door interlock switches.
Component Replacement Procedure
Door Replacement
Procedure for replacing the oven door and its components.
Microwave Measurement
Leakage Test Requirements and Preparation
Requirements and preparation steps for microwave leakage testing.
Circuit Diagrams
Power Unit Circuit Diagram
Circuit diagram for the power unit.
Jog Switch Unit Diagrams
Printed wiring and board diagrams for the jog switch unit.
CPU Unit Circuit Diagram
Circuit diagram for the CPU unit.
Power Unit PWB Diagram
Printed wiring board diagram for the power unit.
Parts List
Electric Parts
List of electrical components with part numbers and quantities.
Cabinet and Control Panel Parts
List of cabinet and control panel parts with part numbers.
Parts List
Oven, Door, Miscellaneous, and Hardware Parts
List of oven, door, miscellaneous, and hardware parts.
Control Panel/Door Parts Exploded Views
Control Panel Parts Exploded View
Exploded view diagram of control panel components.
Door Parts Exploded View
Exploded view diagram of door assembly components.
Miscellaneous/Packing & Accessories Parts
Miscellaneous and Packing Parts Diagrams
Diagrams of miscellaneous parts and packing materials.
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