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Brother SQ900 User Manual

Brother SQ900
164 pages
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Table of Contents

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Brother SQ900 Specifications

General IconGeneral
BrandBrother
ModelSQ900
CategorySewing Machine
LanguageEnglish

Summary

Outline of Mechanism

Main Mechanisms

Details the primary mechanical systems of the sewing machine.

Driveline

Explains the movement of needle bar, thread take-up lever, zigzag mechanism, and feed dog.

Electronic Components Overview

Identifies the locations and functions of electronic parts.

Control System Block Diagram

Illustrates the interconnectedness of the sewing machine's electronic components.

Operation of Electronic Components

Describes the function of individual electronic components in the sewing machine.

Disassembly

Main Parts Disassembly

Provides steps for disassembling the primary components of the sewing machine.

Feed Unit Disassembly

Details the procedure for dismantling the feed mechanism.

Needle-Presser Unit Disassembly

Outlines the steps for taking apart the needle and presser assembly.

Assembly

Main Parts Assembly

Guides on attaching and assembling the major components of the sewing machine.

Feed Unit Assembly

Details the procedure for assembling the feed mechanism.

Needle-Presser Unit Assembly

Outlines the steps for putting together the needle and presser assembly.

Adjustment

Test Mode Procedures

Explains how to use test modes for machine adjustments.

Belt Tension Adjustments

Covers setting timing and motor belt tension.

Thread Tension Adjustment

How to adjust upper thread tension for optimal sewing.

Needle Bar Height Adjustment

Procedure for setting the needle bar height.

Feed Dog Adjustments

Covers front/back, left/right position and height of the feed dog.

Failure Investigation for Electronic Parts

Error Message List

Lists error codes and their potential causes for diagnosis.

Power and Motor Issues

Troubleshooting steps for power failure and motor problems.

Sewing and Operation Errors

Diagnosing issues with pattern sewing and buttonholes.

Component Specific Failures

Troubleshooting for LED lamps, LCD display, and buzzer.

Repair Manual

Common Sewing Problems

Addresses issues like stitch skipping, thread breakage, and seam unevenness.

Machine Operation Failures

Troubleshooting for issues like no start, irregular rotation, and noise.

Threading and Tension Issues

Covers problems with threading and thread tension.

Stitch and Feed Mechanism Problems

Addresses seam unevenness and feed dog related issues.

Special Instructions of Wiring

Needle Bar / Presser Module Wiring

Details wiring for needle and presser components.

Power Supply Unit Wiring

Wiring instructions for the power supply unit.

Front Cover Wiring

Wiring procedures for components within the front cover.

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