Brother S-7300A-333P User manual

S-7300A
Please read this manual before using the machine.
Please keep this manual within easy reach for quick reference.
SINGLE NEEDLE DIRECT DRIVE LOCK STITCHER WITH
ELECTRONIC FEEDING SYSTEM AND THREAD TRIMMER
INSTRUCTION MANUAL

S-7300A
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
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 The instructions which follow this term indicate situations where failure to follow the
instructions will result in death or serious injury.
WARNING
The instructions which follow this term indicate situations where failure to follow the
instructions could result in death or serious injury.
CAUTION
The instructions which follow this term indicate situations where failure to follow the
instructions may result in minor or moderate injury.
Symbols
· · · · · 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.
(For example, the symbol at left means “you must make the ground connection”.)

S-7300A
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
injury.
WARNING
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.
CAUTION
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
, and no dew formation
should occur in any devices.
Excessively dry or humid environments and dew
formation may cause problems with correct
operation.
In the event of an electrical storm, turn off the power
and disconnect the power cord from the wall outlet.
Lightning may cause problems with correct
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.
If using a work table which has casters, the casters
should be secured in such a way so that they
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.
Be sure to wear protective goggles and gloves
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
under any circumstances, as they can cause
vomiting and diarrhea.
Keep the oil out of the reach of children.

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iii
CAUTION
Sewing
This sewing machine should
only be used by
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.
The machine may operate if the treadle is
depressed by mistake, which could result in injury.
When threading the needle
When replacing the bobbin and needle

When not using the machine and when leaving
the machine unattended
If using a work table which has casters, the casters
should be secured in such a way so that they
cannot move.
Attach all safety devices before using the sewing
machine. If the machine is used without these
devices attached, injury may result.
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.
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.
If an error occurs in machine operation, or if
abnormal noises or smells are noticed, immediately
turn off the power switch. Then contact your nearest
Brother dealer or a qualified technician.
If the machine develops a problem, contact your
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
Turn off the power switch before carrying out
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
do not get 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.
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
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
carry out any maintenance and inspection of the
electrical system.
Turn off the power switch and disconnect the power
cord from the wall outlet at the following times,
otherwise the machine may operate if the treadle is
depressed by mistake, which could result in injury.

When carrying out inspection, adjustment and
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
you touch the surface of the motor, it may cause
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.
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
replacing parts and installing optional
accessories, be sure to use only genuine Brother
parts.
Brother will not be held responsible for any
accidents or problems resulting from the use of
non-genuine parts.
If any safety devices have been removed, be
absolutely sure to re-install them to their original
positions and check that they operate correctly
before using the machine.
To prevent accidents and problems, do not modify
the machine yourself.
Brother will not be held responsible for any
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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v
[3] Warning labels
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.
1
2
Touching areas where high voltages are present can
result in severe injury. Turn off the power before
opening the cover.
4
Be careful not to get your hands
caught when returning the
machine head to its original
position after it has been tilted.
3
5
Be careful to avoid injury from
the moving thread take-
up and
pulley.
6
Do not hold. Problems with
operation or injury may occur.
7
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.
8
Direction of operation
9
* Safety devices:
(A) Finger guard
(B) Thread take-up cover
(C) pulley cover
10
Do not
place your hands inside
the bottom cover.
Problems with operation or
injury may occur.

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vi
Control box
Oil tank
Transformer box
(100 V/400 V system only)
0874D

S-7300A
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

S-7300A
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
1. MACHINE SPECIFICATIONS
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
Lubricating oil
-[]0[]P
-[]3[]P
Rotary hook
High-speed spindle
High-speed spindle
Needle bar
Special Brother grease
0875D

S-7300A
2. NAMES OF MAJOR PARTS
2
2. NAMES OF MAJOR PARTS
(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

S-7300A
3. INSTALLATION
3
3. INSTALLATION
CAUTION
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 conn
ect the power cord until installation is
complete. 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.
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.
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.
0475D
0877D
0878D
0879D

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3. INSTALLATION
4
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.
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
0880D
Cotton stand hole
Cord hole
Head rest hole
Control box
mounting hole
0881D

S-7300A
3. INSTALLATION
5
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).
0882D
0883D
0938D

S-7300A
3. INSTALLATION
6
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).
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).
Within 16 mm
0885D
0884D
10 mm

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3. INSTALLATION
7
3-3. Lubrication
CAUTION
Do not connect the power cord until lubrication has been completed, otherwise the machine may operate if the
treadle is depressed by mistake, which could result in injury.
Be sure to wear protective goggles and gloves 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 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.
Upper reference
line
Lower reference
line
0886D

S-7300A
3. INSTALLATION
8
3-4. Connecting the cords
CAUTION
Contact your Brother dealer or a qualified electrician
for any electrical work that may need to be done.
Do not connect the power cord until all cords have
been connected.
The machine may operate if the treadle is depressed
by mistake, which could result in injury.
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.
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.
3-4-1. Connecting the cords
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 connector
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”.
0887D
L
ower the tab (7).
Push in securely until the tabs (7)
engage.
0888D

S-7300A
3. INSTALLATION
9
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”.
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