Brother S7300A Instruction Manual

S-7300A
SINGLE NEEDLE DIRECT DRIVE LOCK STITCHER WITH ELECTRONIC FEEDING SYSTEM AND THREAD TRIMMER
Please read this manual before using the machine. Please keep this manual within easy reach for quick reference.
Thank you very much for buying a BROTHER sewing machine. Before using your new machine, please read the safety instructions and the explanations given in the instruction manual.
With industrial sewing machines, it is normal to carry out work while positioned directly in front of moving parts such as the needle and thread take-up, and consequently there is always a danger of injury that can be caused by these parts. Follow the instructions from training personnel and instructors regarding safe and correct operation before operating the machine so that you will know how to use it correctly.
S-7300A
i
The instructions which follow this term indicate situations where failure to follow the
The instructions which follow this term indicate situations where failure to follow the
(For example, the symbol at left means “you must make the ground connection”.)

SAFETY INSTRUCTIONS

[1] Safety indications and their meanings

This instruction manual and the indications and symbols that are used on the machine itself are provided in order to ensure safe operation of this machine and to prevent accidents and injury to yourself or other people. The meanings of these indications and symbols are given below.
Indications
DANGER
CAUTION
Symbols
WARNING
· · · · ·
· · · · ·
· · · · ·
This symbol ( ) indicates something that you should be careful of. The picture inside the triangle indicates the nature of the caution that must be taken. (For example, the symbol at left means “beware of injury”.)
This symbol ( ) indicates something that you must not do.
This symbol ( ) indicates something that you must do. The picture inside the circle indicates the
nature of the thing that must be done.
The instructions which follow this term indicate situations where failure to follow the instructions will result in death or serious injury.
instructions could result in death or serious injury.
instructions may result in minor or moderate injury.
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ii

[2] Notes on safety

DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before opening the cover of the control box. Touching areas where high voltages are present can result in severe
WARNING
CAUTION
, and no dew formation
Excessively dry or humid environments and dew formation may cause problems with correct
Lightning may cause problems with correct
should be secured in such a way so that they
Be sure to wear protective goggles and gloves
under any circumstances, as they can cause
injury.
Do not allow any liquids to get onto this sewing machine, otherwise fire, electric shocks or operating problems may occur.
If any liquid gets inside the sewing machine (machine head or control box), immediately turn off the power and disconnect the power plug from the electrical outlet, and then contact the place of purchase or a qualified technician.
Environmental requirements
Use the sewing machine in an area which is free from sources of strong electrical noise such as electrical line noise or static electric noise. Sources of strong electrical noise may cause problems with correct operation.
Any fluctuations in the power supply voltage should be within ±10% of the rated voltage for the machine. Voltage fluctuations which are greater than this may cause problems with correct operation.
The power supply capacity should be greater than the requirements for the sewing machine's power consumption. Insufficient power supply capacity may cause problems with correct operation.
The ambient temperature should be within the range of 5°C to 35°C during use. Temperatures which are lower or higher than this may cause problems with correct operation.
The relative humidity should be within the range of 45% to 85% during use should occur in any devices.
operation.
In the event of an electrical storm, turn off the power and disconnect the power cord from the wall outlet.
operation.
Do not connect anything to the USB port other than the USB memory. If this is not observed, problems with operation may result.
Installation
Machine installation should only be carried out by a qualified technician.
Contact your Brother dealer or a qualified electrician for any electrical work that may need to be done.
The sewing machine weighs approximately 34.5 kg (76lb). The installation should be carried out by two or more people.
Do not connect the power cord until installation is complete. The machine may operate if the treadle is depressed by mistake, which could result in injury.
Turn off the power switch before inserting or removing the plug, otherwise damage to the control box could result.
Be sure to connect the ground. If the ground connection is not secure, you run a high risk of receiving a serious electric shock, and problems with correct operation may also occur.
When securing the cords, do not bend the cords excessively or fasten them too hard with staples, otherwise there is the danger that fire or electric shocks could occur.
S-7300A
If using a work table which has casters, the casters
cannot move.
Secure the table so that it will not move when tilting back the machine head. If the table moves, it may crush your feet or cause other injuries.
Use both hands to hold the machine head when tilting it back or returning it to its original position. If only one hand is used, the weight of the machine head may cause your hand to slip, and your hand may get caught.
when handling the lubricating oil and grease, so that they do not get into your eyes or onto your skin, otherwise inflammation can result. Furthermore, do not drink the oil or eat the grease
vomiting and diarrhea. Keep the oil out of the reach of children.
iii
CAUTION
Sewing
only be used by
The machine may operate if the treadle is
When not using the machine and when leaving
should be secured in such a way so that they
machine. If the machine is used without these
personal injury or damage to the
Use both hands to hold the machine head when
only one hand is used, the weight of the machine
If an error occurs in machine operation, or if
If the machine develops a problem, contact your
Turn off the power switch before carrying out
do not get into your eyes or onto your skin,
Furthermore, do not drink the oil or eat the grease under any circumstances, as they can cause
This sewing machine should operators who have received the necessary training in safe use beforehand.
The sewing machine should not be used for any applications other than sewing.
Be sure to wear protective goggles when using the machine. If goggles are not worn, there is the danger that if a needle breaks, parts of the broken needle may enter your eyes and injury may result.
Turn off the power switch at the following times.
depressed by mistake, which could result in injury.
When threading the needle When replacing the bobbin and needle
the machine unattended
If using a work table which has casters, the casters
cannot move.
Attach all safety devices before using the sewing
devices attached, injury may result.
Cleaning
Do not touch any of the moving parts or press any objects against the machine while sewing, as this may result in machine.
Secure the table so that it will not move when tilting back the machine head. If the table moves, it may crush your feet or cause other injuries.
tilting it back or returning it to its original position. If
head may cause your hand to slip, and your hand may get caught.
abnormal noises or smells are noticed, immediately turn off the power switch. Then contact your nearest Brother dealer or a qualified technician.
nearest Brother dealer or a qualified technician.
Do not hold the machine head by the panel when tilting it back or returning it to its original position. If this is not observed, it may result in serious injury or damage to the sewing machine.
cleaning. The machine may operate if the treadle is depressed by mistake, which could result in injury.
Secure the table so that it will not move when tilting back the machine head. If the table moves, it may crush your feet or cause other injuries.
Use both hands to hold the machine head when tilting it back or returning it to its original position. If only one hand is used, the weight of the machine head may cause your hand to slip, and your hand may get caught.
Be sure to wear protective goggles and gloves when handling the lubricating oil and grease, so that they
otherwise inflammation can result.
vomiting and diarrhea. Keep the oil out of the reach of children.
Do not hold the machine head by the panel when tilting it back or returning it to its original position. If this is not observed, it may result in serious injury or damage to the sewing machine.
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iv
CAUTION
Maintenance and inspection
carry out any maintenance and inspection of the
cord from the wall outlet at the following times,
When carrying out inspection, adjustment and
you touch the surface of the motor, it may cause
Use both hands to hold the machine head when
replacing parts and installing optional
Brother will not be held responsible for any accidents or problems resulting from the use of
If any safety devices have been removed, be
positions and check that they operate correctly
Brother will not be held responsible for any
Maintenance and inspection of the sewing machine should only be carried out by a qualified technician.
Ask your Brother dealer or a qualified electrician to
electrical system.
Turn off the power switch and disconnect the power
otherwise the machine may operate if the treadle is depressed by mistake, which could result in injury.
maintenance
When replacing consumable parts such as the
rotary hook and knife
Always be sure to turn off the power switch and then wait one minute before opening the pulley cover. If
burns.
If the power switch needs to be left on when carrying out some adjustment, make sure that you switch the sewing machine to maintenance mode. Pay careful attention to safety.
Secure the table so that it will not move when tilting back the machine head. If the table moves, it may crush your feet or cause other injuries.
tilting it back or returning it to its original position. If only one hand is used, the weight of the machine head may cause your hand to slip, and your hand may get caught.
When accessories, be sure to use only genuine Brother parts.
non-genuine parts.
absolutely sure to re-install them to their original
before using the machine.
To prevent accidents and problems, do not modify the machine yourself.
accidents or problems resulting from modifications made to the machine.
Do not hold the machine head by the panel when tilting it back or returning it to its original position. If this is not observed, it may result in serious injury or damage to the sewing machine.
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[3] Warning labels

1
2
Touching areas where high voltages are present can result in severe injury. Turn off the power before
4
Be careful not to get your hands caught when returning the machine head to its original position after it has been tilted.
3
Be careful to avoid injury from
up and
6
Do not hold. Problems with
7
Be sure to connect the ground. If the ground connection is not
you run a high risk of receiving a serious electric shock, and problems with correct
8
Direction of operation
* Safety devices:
(A) Finger guard
place your hands inside
Problems with operation or
The following warning labels appear on the sewing machine. Please follow the instructions on the labels at all times when using the machine. If the labels have been removed or are difficult to read, please contact your nearest Brother dealer.
opening the cover.
(B) Thread take-up cover (C) pulley cover
9
5
10
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the moving thread take­pulley.
operation or injury may occur.
secure,
operation may also occur.
Do not the bottom cover.
injury may occur.
vi
Control box
Oil tank
Transformer box (100 V/400 V system only)
0874D
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vii
S-7300A

CONTENTS

1. MACHINE SPECIFICATIONS ................. 1
2. NAMES OF MAJOR PARTS ................. 2
3. INSTALLATION ..................................... 3
3-1. Table processing diagram ................................ 4
3-2. Installation ........................................................ 4
3-3. Lubrication ........................................................ 7
3-4. Connecting the cords ........................................ 8
3-4-1. Connecting the cords ............................. 8
3-4-2. Other cords .......................................... 10
3-5. Test operation (Operating the treadle) ........... 14
3-6. Adjusting the treadle ....................................... 15
4. PREPARATION BEFORE SEWING ..... 16
4-1. Installing the needle ........................................ 16
4-2. Removing the bobbin case ............................. 16
4-3. Winding the lower thread ................................ 17
4-4. Installing the bobbin case ............................... 17
4-5. Threading the upper thread ............................ 18
4-6. Using the knee lifter ........................................ 19
5. USING THE OPERATION PANEL
(BASIC OPERATIONS) ........................ 20
5-1. Names and functions ...................................... 20
5-2. Home screen .................................................. 20
5-2-1. Description of detailed home screen ... 21
5-2-2. Description of simple home screen ...... 22
5-2-3. Types of icons ...................................... 23
5-3. Menu screen ................................................... 24
5-4. Program setting method ................................. 25
5-4-1. Program structure ................................ 25
5-4-2. Start backtack settings ......................... 28
5-4-3. Main sewing settings ............................ 29
5-4-4. End backtack settings .......................... 30
5-5. Using program individual functions
and program common functions ..................... 31
5-5-1. Needle up/down ................................... 32
5-5-2. Thread trimming lock ........................... 32
5-5-3. Thread wiper ........................................ 32
5-5-4. Correction sewing ................................ 33
5-5-5. AUTO ................................................... 33
5-5-6. Slow start ............................................. 34
5-5-7. Special locus ........................................ 34
5-5-8. Best PFM mode ................................... 35
5-5-9. X-over seam assist mode .................... 35
5-6. Using the production counter ......................... 36
5-7. Using the lower thread counter ...................... 37
5-8. Home screen mode setting ............................ 39
5-9. Illumination LED brightness setting ................ 40
6. USING THE OPERATION PANEL
(ADVANCED OPERATIONS) .............. 41
6-1. Adding and deleting steps ............................... 41
6-2. Editing steps.................................................... 42
6-3. Sewing start step setting ................................. 43
6-4. Program copy .................................................. 44
6-5. Shortcut key assignment method ................... 45
6-6. Design stitch registration method ................... 46
6-7. Working pace setting method ......................... 48
6-8. Memory switch setting method (Standard) ..... 49
6-9. List of memory switch settings ........................ 50
6-10. Hand switches ............................................... 54
6-10-1. Hand switch function setting............... 56
6-10-2. 2nd correction pitch setting ................ 57
6-10-3. 2nd pitch setting ................................. 57
6-11. Reading and writing data using
USB media .................................................... 58
6-12. Resetting all settings to their defaults ........... 59
7. SEWING ............................................... 60
7-1. Sewing ............................................................ 60
7-2. Using the thread wiper .................................... 60
7-3. Backtacking ..................................................... 61
7-4. Sewing condensed stitches ............................ 62
8. NEW FUNCTIONS ................................ 63
8-1. Best PFM mode (short trailing length/
bird's nest reduction mode) ............................. 63
8-2. Using X-over seam assist mode ..................... 64
8-3. Using the feed dog locus ................................ 65
8-4. Example of using hand switch settings ........... 66
9. THREAD TENSION .............................. 67
9-1. Adjusting the thread tension ........................... 67
9-2. Adjusting the presser foot pressure ................ 68
9-3. Adjusting the trailing length after thread
trimming .......................................................... 68
9-4. Adjusting the thread take-up amount
(-[][]3 specifications) ........................................ 69
10.CLEANING ........................................... 70
10-1. Daily cleaning procedures ............................. 70
11.ADJUSTING THE ROTARY HOOK
LUBRICATION AMOUNT .................... 72
12.STANDARD ADJUSTMENTS .............. 73
12-1. Thread tension spring ................................... 73
12-2. Arm thread guide R ....................................... 74
12-3. Presser foot height ........................................ 75
12-4. X-over seam sensor correction ..................... 75
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12-5. Adjusting the feed dog height ....................... 76
12-6. Adjusting the feed dog angle ........................ 77
12-7. Adjusting the needle bar height .................... 78
12-8. Adjusting the needle and feed
mechanism timing ........................................ 79
12-9. Needle and rotary hook timing ..................... 80
12-10. Adjusting the presser foot floating amount
(minute lifting amount) (option)................... 81
12-11. Thread trimming ......................................... 82
13.LIST OF ERROR CODES ..................... 86
14.TROUBLESHOOTING .......................... 90
S-7300A
1. MACHINE SPECIFICATIONS
1
3
4
Thread wiper - O
0
3
Lubrication type
Minimum lubrication
Semi dry
3
5
Use
For mediumweight materials
For heavy-weight materials
-333P,-433P,
-303P, -403P
-305P
-405P
Max. sewing speed * Standard feed locus
Pitch 4 or less /5000 sti/min
More than pitch 4/4000 sti/min
Pitch 4 or less /4500 sti/min
More than pitch 4/4000 sti/min
Backtack sewing speed * Standard feed locus
Automatic 150 (*1) - 3000 sti/min, Manual 150 (*1) - 4000 sti/min*
(*1) Inching setting speed
Max. stitch length
5mm
7mm(* 5 mm at time of shipment)
Presser foot height
Lifting lever
6mm
Knee lifter
16mm
Feed dog height
0.8mm
1.2mm
Needle (DB×1, DP×5)
#11 - #18
#19 - #22
Motor
AC servo motor
Control circuit
Microprocessor
Rotary hook
New lubrication-type rotary hook
-[]0[]P
-[]3[]P
Rotary hook
High-speed spindle
Needle bar
Special Brother grease
0875D

1. MACHINE SPECIFICATIONS

Lubricating oil
High-speed spindle
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2. NAMES OF MAJOR PARTS
2
(1) Bobbin winder
(2) Thread wiper device
(3) Lifting lever
(4) Hand switch A
(5) Hand switch B
(6) Work clamp
(7) Knee lifter plate
(8) Power switch
(9) Oil gauge window
(10) Oil feeding pocket
(11) Machine pulley
(12) Operation panel
(13) Cotton stand
(14) Control box
(15) Power indicator
(16) USB port
Safety devices:
(17) Pulley cover
(18) Thread take-up cover
(19) Finger guard
0876D

2. NAMES OF MAJOR PARTS

S-7300A
3. INSTALLATION
3
CAUTION
Machine installation should only be carried out by a
Contact your Brother dealer or a qualified electrician
. The installation should be carried out by two
ect the power cord until installation is
complete. The machine may operate if the treadle is
Secure the table so that it will not move when tilting back the machine head. If the table moves, it may
tilting it back or returning it to its original position. If only one hand is used, the weight of the machine head may cause your hand to slip, and your hand
0475D
0877D
0878D
0879D

3. INSTALLATION

qualified technician.
for any electrical work that may need to be done.
The sewing machine weighs approximately 34.5 kg (76lb) or more people.
Do not conn
depressed by mistake, which could result in injury.
About the machine set-up location
Do not set up this sewing machine near other equipment such as
televisions, radios or cordless telephones, otherwise such equipment may be affected by electronic interference from the sewing machine.
The sewing machine should be plugged directly into an AC wall
outlet. Operation problems may result if extension cords are used.
crush your feet or cause other injuries.
Use both hands to hold the machine head when
may get caught.
Carrying the machine
The sewing machine should be carried by the arm and the pulley
cover by two people as shown in the illustration.
* Do not hold by any part other than the pulley cover. If this is not
observed, it may result in damage to the sewing machine.
* Do not hold the operation panel.
Tilting back the machine head
Hold section (A) with your foot so that the table does not move,
and then push the arm with both hands to tilt back the machine head.
* Do not push the operation panel.
Returning the machine head to the upright position
1. Clear away any tools, etc. which may be near the table holes.
2. While holding the face plate with your left hand, gently return the machine head to the upright position with your right hand.
* Do not hold the operation panel.
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3. INSTALLATION
4
0880D
Control box mounting hole
0881D

3-1. Table processing diagram

The top of the table should be 40 mm in thickness and should be strong enough to hold the weight and with-stand the
vibration of the sewing machine.
Drill holes as indicated in the illustration below.
Head rest hole
Cotton stand hole
Cord hole

3-2. Installation

1. Control box
(1) Control box (2) Bolts [4 pcs] (3) Washers [2 pcs] (4) Nuts [2 pcs] (5) Spring washers [2 pcs] (6) Washers [2 pcs] (7) Bolts (large) [2 pcs] (8) Nuts (large) [2 pcs] (9) Spring washers (large) [2 pcs] (10) Washers (large) [2 pcs]
2. Connecting rod
(11) Connecting rod (12) Nut
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3. INSTALLATION
5
0882D
0883D
0938D
3. Rubber cushions
(1) Rubber cushions [2 pcs]
4. Machine head
(1) Hinges [2 pcs] (2) Machine head (3) Head rest
NOTE:
Bind the cords together and pass
them through the cord hole.
Tap the head rest (3) securely into
the table hole. If the head rest (3) is
not pushed in as far as it will go, the
machine head will not be sufficiently
stable when it is tilted back.
5. Machine head seal
1. Tilt back the machine head, and then peel off the sticker (1).
2. Peel off the protective sheet (3) from the operation panel (2).
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3. INSTALLATION
6
0885D
0884D
6. Knee lifter plate
<Knee lifter adjustment>
1. Turn the machine pulley so that the feed dog is below the top of the needle plate.
2. Lower the presser foot (1) by using the lifting lever (2).
3. Loosen the nut (3).
4. Turn the screw (5) to adjust so that the amount of play in the knee lifter plate (4) is approximately 10 mm.
5. Securely tighten the nut (3).
10 mm
Within 16 mm
6. Loosen the nut (6).
7. Turn the adjusting screw (8) to adjust so that the presser
foot (7) is at the desired position within a distance of 16 mm of the needle plate when the knee liter plate is fully pressed.
8. After adjustment is completed, securely tighten the nut (6).
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3. INSTALLATION
7
CAUTION
Do not connect the power cord until lubrication has been completed, otherwise the machine may operate if the
Be sure to wear protective goggles and gloves when handling the lubricating oil and grease, so that they do not get
Upper reference line
Lower reference line
0886D

3-3. Lubrication

treadle is depressed by mistake, which could result in injury.
into your eyes or onto your skin, otherwise inflammation can result. Furthermore, do not drink the oil or eat the grease under any circumstances, as they can cause vomiting and diarrhea. Keep the oil out of the reach of children.
When cutting the nozzle of the oil tank, hold the base of the nozzle securely. If you hold the end of the nozzle, injury from the scissors may result.
The sewing machine should always be lubricated and the oil supply replenished before it is used for the first time, and also after long periods of non-use.
1. Hold the base of the nozzle of the accessory oil tank (1), and use scissors to cut about half-way along the straight section (A) of the nozzle.
2. Loosen and remove the nozzle, and then remove the seal (2).
3. Tighten the nozzle.
4. Open the oil feeding pocket cover (3).
5. Insert the nozzle of the oil tank (1) deeply into the
oil feeding pocket (4), and then add about 120 ml of lubricating oil.
6. Check that the oil gauge (6) comes to the upper
reference line in the oil gauge window (5).
7. Close the oil feeding pocket cover (3).
<Lubrication oil replenishment interval>
Be sure to add more oil if the oil gauge (6) is below the lower reference line.
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3. INSTALLATION
8
CAUTION
Do not connect the power cord until all cords have
The machine may operate if the treadle is depressed
When securing the cords, do not bend the cords
too hard with staples,
otherwise there is the danger that fire or electric
Be sure to connect the ground. If the ground
receiving a serious electric shock, and problems with correct operation may also occur.
0887D
L
Push in securely until the tabs (7) engage.
0888D

3-4. Connecting the cords

Contact your Brother dealer or a qualified electrician for any electrical work that may need to be done.
been connected.
by mistake, which could result in injury.

3-4-1. Connecting the cords

ower the tab (7).
excessively or fasten them
shocks could occur.
connection is not secure, you run a high risk of
1. Harness cover
1. Raise the harness cover (1).
2. Cords (1)
(1) Harness cover (2) Sewing machine motor encoder
connector 16-pin
(3) Feed motor encoder connector
6-pin (4) Hand switch connector 12-pin (5) 10-pin operation panel connector (6) 10-pin solenoid
1. Pass the cords through the harness
cover (1).
2. Connect the cords to the control
box.
NOTE:
For Europe specifications, Americas 220V specifications and 100V/400V system specifications, refer to “3-4-2. Other cords”.
connector
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3. INSTALLATION
9
0889D
Lower the tab (4).
Align the flat edges
Push in securely until the tabs (4) engage.
Green and yellow wire (ground wire)
Ground symbol
0928D
0890D
3. Lower the harness cover (1), and
then place the harness inside the harness cover.
3. Cords (2)
(1) 4-pin machine motor connector (2) Feed motor connector 6-pin (3) 3-pin power connector
4. Ground wire
(1) Ground wire (2) Screw (Recommended tightening
torque 1.0±0.1 N.m) (3) Power cord
1. Attach an appropriate plug to the
power cord (3). (The green and yellow wire is the ground wire.)
2. Insert the power plug into a
properly-grounded electrical outlet.
NOTE:
Make sure that the ground
connections are secure in order to ensure safety.
For Europe specifications,
Americas 220 V specifications and 100 V/400 V system specifications, refer to “3-4-2. Other cords”.
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3. INSTALLATION
10
DANGER
after turning off the power switch and disconnecting the power cord from the wall outlet
before opening the cover of the control box. Touching areas where high voltages are present can result in severe
0943D
Green and yellow wire (ground wire)
Control box
Leg
<Seen from underneath table>

3-4-2. Other cords

Wait at least 5 minutes
injury.
For Europe specifications, Americas 220V specifications and 100 V/400 V system specifications, connect the cords according to the respective specifications.
< Europe specifications > (1) Filter box (2) Screws [4 pcs] (3) Connector (4) CE bush plate (5) Screws [2 pcs] (6) CE D cord cover (7) Screws [2 pcs] (8) Staples [5 pcs] (9) Power cord
1. Attach an appropriate plug to the
power cord (9). (The green and yellow wire is the ground wire.)
2. Insert the power plug into a
properly-grounded electrical outlet.
NOTE:
Take care when tapping in the
staples (8) to make sure that they do not pierce the cords.
Do not use extension cords,
otherwise machine operation problems may result.
S-7300A
3. INSTALLATION
11
4145M
<For 100V/400V system specifications>
(1) Power switch (2) Screws [2 pcs]
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3. INSTALLATION
12
Green and yellow
0945D
(3) Transformer box (4) Transformer box plates [2 pcs] (5) Screw [with washer] (6) 3-pin power supply connector (7) Staples [5 pcs] (8) Cord clamps [2 pcs] (9) Power cord
1. Attach an appropriate plug to the
power cord (9). (The green and yellow wire is the ground wire.)
2. Insert the power plug into a
properly-grounded electrical outlet.
NOTE:
Take care when tapping in the
staples (7) to make sure that they do not pierce the cords.
Do not use extension cords,
otherwise machine operation problems may result.
wire (ground wire)
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3. INSTALLATION
13
Operator
4145M
0892D
Green and yellow
<For Americas 220V specifications>
(1) Power switch (2) Screws [2 pcs]
(3) 3-pin power supply connector (4) Power cord (5) Staples [5 pcs]
1. Attach an appropriate plug to the
power cord (4). (The green and yellow wire is the ground wire.)
2. Insert the power plug into a
properly-grounded electrical outlet.
NOTE:
Take care when tapping in the
staples (5) to make sure that they do not pierce the cords.
Do not use extension cords,
otherwise machine operation problems may result.
wire (ground wire)
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3. INSTALLATION
14
CAU
TIO
N
0893D

3-5. Test operation (Operating the treadle)

Do not touch any of the moving parts or press any objects against the machine while sewing, as this may result in personal injury or damage to the machine.
1. Turning on the power
Press the ON power switch (1).
The power indicator (2) will illuminate.
The display (3) of the operation panel will change in the order shown in the illustration. (During this time, the feed mechanism will return to the home position.)
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3. INSTALLATION
15
3648M
2117M
0939D
0940D

3-6. Adjusting the treadle

2. Test operation
1. Check that the machine sews at low speed when
the treadle (1) is gently pressed to position (B).
2. Then check that it sews at high speed when the treadle
(1) is gently pressed to position (C).
3. After pressing the treadle (1) forward, check
that the needle is lowered to the top of the needle plate when the treadle (1) is returned to the neutral position (A). (when needle down stopping has been set.)
4. If the treadle (1) is pressed to position (D), thread
trimming is carried out and the needle then rises above the needle plate and stops.
<Forward depression sensitivity adjustment>
If the machine starts running at low speed when your foot is simply resting on the treadle, or if the treadle pressure is felt to be too weak, adjust the position (a to c) at which the treadle spring (1) is hooked onto the treadle lever (2).
* a is the weakest position, and it becomes gradually
stronger at b, c and d respectively.
<Backward depression sensitivity adjustment>
1. Loosen the nut (3) and turn the bolt (4).
* When the bolt (4) is tightened, the treadle operation
becomes heavier, and when it is loosened, the operation becomes lighter.
2. Tighten the nut (3).
< Adjusting the treadle stroke >
Remove the nut (5), and then move the connecting rod joint (6) from the position in figure A to the position in figure B. The treadle stroke will then be increased by approximately 27 %. At this time, the treadle forward and backward depression sensitivity will change, so readjust if necessary.
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4. PREPARATION BEFORE SEWING
16
CAUTION
CAUTION
0894D
0795M
Front
Long
2119M
2120M
For thick materials
0798M
2121M

4. PREPARATION BEFORE SEWING

4-1. Installing the needle

Turn off the power switch before installing the needle. The machine may operate if the treadle is depressed by mistake, which could result in injury.
1. Turn the machine pulley to move the needle bar to its highest position.
2. Loosen the screw (1).
3. Insert the needle (2) in a straight line as far as it will go, making sure that the long groove on the needle is at the left, and then securely tighten the screw (1).

4-2. Removing the bobbin case

groove
Turn off the power switch before removing the bobbin case. The machine may operate if the treadle is depressed by mistake, which could result in injury.
1. Turn the machine pulley to raise the needle until it is above the needle plate.
2. Pull the latch (1) of the bobbin case upward and then remove the bobbin case.
3. The bobbin (2) will come out when the latch (1) is released.
* There is an anti-spin spring (3) inside the bobbin case. The
anti-spin spring (3) prevents the bobbin from racing at times such as during thread trimming.
* Use bobbins (2) made of light alloy as specified by
BROTHER.
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4. PREPARATION BEFORE SEWING
17
2126M
CAUTION
Do not touch any of the moving parts or press any objects against the machine while winding the lower thread, as
CAUTION
0895D
0896D
2124M
Less thread
More thread
0802M
2125M

4-3. Winding the lower thread

this may result in personal injury or damage to the machine.
1. Turn on the power switch.
2. Place the bobbin (1) onto the bobbin winder shaft (2).
3. Wind the thread several times around the bobbin (1) in the direction indicated by the arrow.
4. Push the bobbin presser arm (3) toward the bobbin(1).
5. Raise the presser foot with the lifting lever.
6. Depress the treadle. Lower thread winding will then start.
7. Once winding of the lower thread is completed, the bobbin presser arm (3) will return automatically.
8. After the thread has been wound on, remove the bobbin and cut the thread with the knife (4).
* Loosen the screw (5) and move the bobbin presser (6) to
adjust the amount of thread wound onto the bobbin.
NOTE:
The amount of thread wound onto the bobbin should be a maximum of 80 % of the bobbin capacity.

4-4. Installing the bobbin case

Turn off the power switch before installing the bobbin case. The machine may operate if the treadle is depressed by mistake, which could result in injury.
1. Turn the machine pulley to raise the needle until it is above the needle plate.
2. While holding the bobbin so that the thread winds to the right, insert the bobbin into the bobbin case.
3. Pass the thread through the slot (1) and under the tension spring (2), and then pull it out from the thread guide (3).
4. Check that the bobbin turns clockwise when the thread is pulled.
5. Hold the latch (4) on the bobbin case and insert the bobbin case into the rotary hook.
S-7300A
4. PREPARATION BEFORE SEWING
18
CAUTION
0897D
25 - 30mm (Reference value: #60 spun thread)

4-5. Threading the upper thread

Turn off the power switch before threading the upper thread. The machine may operate if the treadle is depressed by mistake, which could result in injury.
Turn the machine pulley and raise the thread take-up (1) before threading the upper thread. This will make threading easier and it will prevent the thread from coming out at the sewing start.
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4. PREPARATION BEFORE SEWING
19
0899D

4-6. Using the knee lifter

The presser foot (2) can be raised by pressing the knee lifter plate (1).
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