Brother RH-9820 Service Manual (English)

Other manuals for Brother RH-9820

Parts Book132 pages

Instruction Manual134 pages

Brochure6 pages

Brochure & Specs6 pages

Questions and Answers:

S
Stephanie WagnerAug 19, 2025
Why does the thread keep breaking on my Brother Sewing Machine?
- E
  Elizabeth Green MDAug 19, 2025
  If the thread breaks on your Brother Sewing Machine, it could be due to several reasons: * The thread tension might be too strong; in this case, adjust it to the correct tension. * The needle might not be installed correctly; ensure it faces the right way. * The thread could be too thick for the needle; choose a more suitable thread. * The needle and looper adjustment might be off; adjust the clearance between the needle and looper, the needle bar height, or the looper and spreader height. * There might be damage to the needle, looper, spreader, throat plate, or thread path; repair or replace the affected parts. * The thread might not be threaded correctly; make sure to thread it properly.
T
Tracy HopkinsAug 21, 2025
What to do if my Brother RH-9820 is skipping stitches?
- S
  Stacy PhamAug 21, 2025
  Skipped stitches on your Brother Sewing Machine can occur due to several reasons. The upper thread tension might be too strong or too weak, requiring an adjustment to the correct tension. The needle point could be broken or bent, suggesting a replacement with a new needle. Incorrect clearance between the needle and looper tip necessitates an adjustment. Other potential issues include incorrect needle, looper, and spreader adjustment, which also needs correction. Adjusting the needle guard may be necessary if the needle and needle guard adjustment is incorrect. A blunt looper tip should be repaired with an oilstone or replaced. Ensure the needle is correctly installed and select a needle suitable for the sewing conditions if it's too thin.
N
Natasha ScottAug 25, 2025
How to fix a broken needle on my Brother RH-9820 Sewing Machine?
- T
  Troy LuceroAug 25, 2025
  A broken needle in your Brother Sewing Machine could be due to a bent needle, which requires replacement. Incorrect adjustment of the needle, looper, and spreader also can cause this, so adjust accordingly. If the needle guard covers the needle too far, adjust the needle guard. Also, if the needle is too thin, select a needle suitable for the sewing conditions.
T
Taylor WheelerAug 26, 2025
What to do if skipped stitches occur on Brother RH-9820 Sewing Machine?
- Q
  quinnshellyAug 26, 2025
  Skipped stitches can occur due to several reasons. You can try the following: * Adjust the upper thread tension if it's too strong or weak. * Replace a broken or bent needle. * Adjust the clearance between the needle and looper tip. * Adjust the needle, looper, and spreader. * Adjust the needle guard. * Repair a blunt looper tip with an oilstone or replace it. * Ensure the needle is correctly installed. * Use a needle suitable for the sewing conditions.
K
kroblesAug 27, 2025
Why is my Brother RH-9820 Sewing Machine needle breaking?
- R
  Ricky MillerAug 28, 2025
  A broken needle can be caused by: * A bent needle. Replace it with a new one. * Incorrect adjustment of the needle, looper, and spreader. Adjust them correctly. * The needle guard covering the needle too far. Adjust the needle guard. * A needle that is too thin. Select a needle suitable for the sewing conditions.
V
Virginia ButlerAug 29, 2025
Why is the thread tightening poorly on my Brother RH-9820 Sewing Machine?
- J
  Judy RobertsonAug 29, 2025
  Poor thread tightening on your Brother Sewing Machine can stem from several factors. The upper or lower thread tension might be too strong or too weak; adjust them to the correct tension. Additionally, the tension or stroke of the thread take-up spring could be incorrect, requiring adjustment.
P
patelchristineAug 31, 2025
Why is thread unravelling at the sewing start on my Brother Sewing Machine?
- P
  Phyllis RobinsonAug 31, 2025
  If thread is unravelling at the start of sewing with your Brother Sewing Machine, it could be that the lower thread is not being held properly; adjust the lower thread nipper (-01 specifications) or the lower thread presser (-02 specifications). The upper thread length might be too short after trimming, so adjust the sub tension. Also, not enough upper thread might be fed out; adjust the amount of upper thread being fed out.
E
Erika CohenSep 2, 2025
Why is the thread unravelling at sewing start on my Brother RH-9820 Sewing Machine?
- W
  Wesley Frey DVMSep 3, 2025
  Thread unravelling at the start of sewing can occur because: * The lower thread is not being held. Adjust the lower thread nipper (-01 specifications) or the lower thread presser (-02 specifications). * The upper thread length is too short after trimming. Adjust the sub tension. * Not enough upper thread is being fed out. Adjust the amount of upper thread being fed out. * Upper thread loops are uneven. Set slow start and bar tacking.
J
James GonzalezSep 5, 2025
What to do if material is not being cut cleanly by Brother Sewing Machine?
- G
  gabriellaschmittSep 5, 2025
  If the material isn't being cut cleanly: * Adjust the cutting pressure to be strong enough. * Grind the hammer surface if the knife and hammer aren't contacting properly. * Replace the knife if it's blunt.
H
harrisemmaSep 6, 2025
What to do if the upper thread is not cut on my Brother RH-9820 Sewing Machine?
- S
  Stacey MartinezSep 6, 2025
  If the upper thread is not being cut on your Brother Sewing Machine, it could be due to a blunt upper movable knife, which should be replaced. The knife might not move to its full stroke because the air pressure is too weak, so adjust the air pressure. Also, the knife might not be picking up the upper thread; install it so that it cuts only one side of the upper thread loop. Finally, the upper movable knife position might be incorrect, requiring an adjustment.

Brother RH-9820 Specifications

General

Brand	Brother
Model	RH-9820
Category	Sewing Machine
Language	English

Summary

SAFETY INSTRUCTIONS

Safety Indications and Meanings

Explains the meaning of safety indications and symbols used in the manual.

General Safety Notes

Provides crucial safety precautions for environmental requirements, installation, and operation.

Specific Operational Safety

Details safety measures for sewing, cleaning, and maintenance operations.

MACHINE SPECIFICATIONS

FUNCTION SETTINGS

List of Special Functions

Lists special functions available upon powering on the machine.

List of Advanced Functions

Lists advanced functions and their access methods.

Memory Switch Settings

Explains how to configure advanced memory switch settings.

System Checking Procedures

Describes methods for checking system errors, inputs, outputs, and software versions.

READING/WRITING DATA

CF Card Handling Precautions

Provides essential precautions for handling CF cards for data transfer.

Data Read/Write Mode

Describes how to enter and use the data read/write mode for CF cards.

Updating Control Programs

Describes procedures for updating main and panel control programs via CF card.

MECHANICAL DESCRIPTIONS

Upper Shaft and Needle Bar Mechanisms

Describes the upper shaft and needle bar mechanisms.

Feed Mechanism Details

Details the components and operation of the feed mechanism.

Cutter Mechanism

Describes the components of the cutter mechanism.

Looper Mechanism

Describes the components of the looper mechanism.

DISASSEMBLY

Covers and Presser Foot Mechanism Disassembly

Details the disassembly of machine covers and the presser foot mechanism.

Feed Mechanism Disassembly

Details the disassembly steps for the feed mechanism.

Looper Mechanism Disassembly

Details the disassembly steps for the looper mechanism.

Needle Bar Mechanism Disassembly

Details the disassembly steps for the needle bar mechanism.

ASSEMBLY

Cutter Mechanism Assembly

Details the steps for assembling the cutter mechanism.

Feed Base Mechanism Assembly

Details the steps for assembling the feed base mechanism.

Upper Shaft Motor Mechanism Assembly

Details the steps for assembling the upper shaft motor mechanism.

Covers Installation

Details the steps for installing various machine covers.

ADJUSTMENTS

Needle and Looper Timing Adjustment

Adjusts the timing between the needle and looper for correct stitch formation.

Knife Position and Cutting Pressure Adjustments

Adjusts knife position and cutting pressure for clean thread trimming.

Work Clamp and Cloth Opening Adjustments

Adjusts work clamp lift, position, and cloth opening amounts.

Home Position and Stop Position Adjustments

Adjusts home and stop positions for looper base and upper shaft.

ELECTRICAL MECHANISM

Precautions During Adjustments

Provides crucial safety precautions before performing electrical adjustments.

Control Box and Panel Structure

Details the internal structure of the control box and operation panel.

Fuse and Connector Descriptions

Lists fuses, connector locations, and their functions for troubleshooting.

Symptoms of Poor Connections

Lists symptoms and connector locations related to poor electrical connections.

Troubleshooting

Troubleshooting Procedure and Flowchart

Outlines the general procedure and flowchart for diagnosing operational problems.

Remedy for Common Problems

Lists causes and remedies for various operational and electrical issues.

ERROR CODES

Switch-Related Errors

Lists error codes related to switch operations and their remedies.

Upper Shaft Motor-Related Errors

Lists error codes related to the upper shaft motor and their remedies.

Feed Mechanism-Related Errors

Lists error codes related to the feed mechanism and their remedies.

Communication and Memory-Related Errors

Lists error codes related to communication and memory issues.

Software-Related Errors

Lists error codes related to software and program versions.

Device-Related Errors

Lists error codes related to device malfunctions.

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