Sharp R-1870

R-1870
R-1871
S91M173R1870E
OVER THE RANGE
MICROWAVE OVEN
MODELS R-1870/R-1871
This is a supplemental Service Manual for Models R-1870/R1871.
This model is quite similar to Base Model R-1850 (S/M# S6804R1850X//).
Use this supplemental manual together with the Base Model Service Manuals for complete operation and service information
Model R-1870
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
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
MICROWAVE MEASUREMENT PROCEDURE .....................................................................................................2
FOREWORD AND WARNING ................................................................................................................................3
PRODUCT SPECIFICATIONS...............................................................................................................................4
GENERAL INFORMATION ...................................................................................................................................4
OPERATION .........................................................................................................................................................6
COMPONENT TEST .............................................................................................................................................9
PICTORIAL DIAGRAM ........................................................................................................................................10
LSI UNIT CIRCUIT...............................................................................................................................................11
PARTS LIST........................................................................................................................................................12
PACKING AND ACCESSORIES .........................................................................................................................18
SHARP ELECTRONICS CORPORATION
This document has been published to be used for after
sales service only.
The contents are subject to change without notice.
Service Headquarters: Sharp Plaza, Mahwah, New Jersey, 07430-2135
SUPPLEMENTAL SERVICE MANUAL

Sharp R-1870 Specifications

General

Brand	Sharp
Model	R-1870
Category	Microwave Oven
Language	English

Summary

Introduction and Safety Warnings

Model Identification and Overview

Identifies the microwave oven models covered by the manual.

Service Personnel High Voltage Warning

Warns service personnel about high voltage hazards within microwave ovens.

Microwave Exposure Prevention

Pre-Servicing Safety Checks

Outlines pre-service checks and actions for operative units.

Microwave Leakage Measurement Procedure

Details the setup and steps for conducting a microwave leakage test.

Critical Service Safety Procedures

High Voltage Component Hazards

Alerts service personnel to specific high-voltage parts to avoid.

Servicing and Testing Protocols

Provides step-by-step instructions for before, during, and after service testing.

Microwave Measurement Standards and Tests

Leakage Measurement Requirements

Specifies limits and standards for microwave leakage measurement.

Leakage Test Execution

Details the setup and steps for conducting a microwave leakage test.

Manual Scope and Operational Safety

Manual Purpose and Recommended Study

Explains the manual's purpose and recommends studying it with the base model manual.

Pre-Operation Safety Checklist

Lists critical checks to ensure oven safety before operation.

Specifications and Grounding

Technical Specifications Summary

Provides detailed technical specifications for the microwave oven.

Electrical Grounding Requirements

Explains the importance and procedure of proper grounding for safety.

Oven Diagrams and Control Panel

Oven Component Identification

Illustrates the external and internal components of the oven.

Control Panel Layout and Buttons

Details the layout and function of the control panel buttons.

Oven Operation Sequences

Operating Mode Descriptions

Describes the sequence of operations for the oven (Off, Cooking).

Variable Power Cooking Levels

Explains the power level settings (P-0 to P-90) and their ON/OFF times.

Electrical Schematics Overview

Off Condition Circuit Diagram

Illustrates the oven's electrical circuit in the off state.

Microwave Cooking Circuit Diagram

Shows the oven's electrical circuit during microwave cooking.

Specialized Operation Schematics

Convection Cooking Circuit

Depicts the electrical wiring for convection cooking modes.

Automatic Mix Cooking Circuit

Illustrates the circuit for automatic mixed cooking functions.

Component Testing

Key Unit Test Procedure

Describes how to test the key unit for proper functionality.

Pictorial Component Diagram

Oven Part Identification

Visually identifies various oven components in their locations.

Control Panel Circuitry

Touch Control Panel Schematic

Details the electrical circuit diagram for the touch control panel.

Parts Identification - Electrical and Cabinet

Electrical Parts List

Lists electrical parts, their part numbers, and quantities.

Cabinet Parts List

Lists cabinet parts, their part numbers, and quantities.

Parts Identification - Control Panel and Hardware

Control Panel Components

Lists parts related to the control panel and connectors.

Hardware and Fasteners List

Lists screws, nuts, and washers used in the assembly.

Oven and Cabinet Parts Diagram

Component Location Illustration

Visually identifies oven and cabinet components.

Parts Ordering and Hardware Details

Hardware Part Number List

Lists detailed part numbers for screws, nuts, and washers.

Procedure for Ordering Parts

Provides instructions on how to order replacement parts.

Packing and Accessories

Accessory Pack Contents List

Lists the items included in the accessory pack.

Packaging Material Overview

Illustrates the packing case and protective materials.

Assembly Diagrams

Control Panel Assembly View

Shows the assembly of control panel parts.

Door Assembly Components View

Illustrates the parts that make up the oven door.

Miscellaneous Parts Diagram

Depicts miscellaneous parts like harnesses and racks.