Sharp R-1851 User Manual

R-1850
R-1851
S6804R1850X//
OVER THE RANGE
MICROWAVE OVEN
MODELS
R-1850
R-1851
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.
SERVICE MANUAL
SHARP ELECTRONICS CORPORATION
Service Headquarters: Sharp Plaza, Mahwah, New Jersey 07430-2135
TABLE OF CONTENTS
Page
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICE TO
AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ...................INSIDE FRONT COVER
BEFORE SERVICING ...........................................................................................................................................1
MICROWAVE MEASUREMENT PROCEDURE ...................................................................................................2
FOREWORD.......................................................................................................................................................... 3
PRODUCT SPECIFICATIONS .............................................................................................................................. 4
GENERAL INFORMATION................................................................................................................................... 4
OPERATION ..........................................................................................................................................................6
TROUBLESHOOTING GUIDE ............................................................................................................................14
TEST PROCEDURE ............................................................................................................................................16
TOUCH CONTROL PANEL .................................................................................................................................23
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................29
PICTORIAL DIAGRAM ........................................................................................................................................37
CONTROL PANEL CIRCUIT ...............................................................................................................................38
PRINTED WIRING BOARD .................................................................................................................................39
PARTS LIST ........................................................................................................................................................40
PACKING AND ACCESSORIES .........................................................................................................................46

Sharp R-1851 Specifications

General

Brand	Sharp
Model	R-1851
Category	Microwave Oven
Language	English

Summary

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY

BEFORE SERVICING

Procedures to follow before starting service operations on the microwave oven.

MICROWAVE MEASUREMENT PROCEDURE

Steps for measuring microwave emissions to ensure safety compliance.

PRODUCT DESCRIPTION

GENERAL INFORMATION

GROUNDING INSTRUCTIONS

Important safety guidelines regarding grounding the appliance for electrical safety.

OPERATION

DESCRIPTION OF OPERATING SEQUENCE

Detailed steps of how the oven functions during normal operation.

VARIABLE COOKING MODES

Explanation of power levels, convection, mix, and sensor cooking modes.

TROUBLESHOOTING GUIDE AND TEST PROCEDURE

TROUBLESHOOTING GUIDE

Table of common problems, their possible causes, and parts to check.

TEST PROCEDURES

Step-by-step instructions for testing specific components of the oven.

TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

Overview of the touch control panel's structure and functions.

ABSOLUTE HUMIDITY SENSOR CIRCUIT

Detailed explanation of the absolute humidity sensor circuit.

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

EXTERNAL COMPONENTS AND OVEN REMOVAL

Procedures for removing external parts and the oven itself.

MAJOR INTERNAL COMPONENTS REMOVAL

Steps for removing key internal components like magnetron and transformer.

DOOR AND PANEL COMPONENTS

Procedures for removing and adjusting door and control panel components.

WIRING DIAGRAMS

SCHEMATIC DIAGRAMS

Electrical schematics showing oven operation modes.

PICTORIAL AND CONTROL DIAGRAMS

Visual diagrams of component layout and control panel circuits.

PARTS LIST

PARTS LIST SECTIONS

Categorized list of all replaceable parts with part numbers.

PACKING AND ACCESSORIES