Brother S-7300A User manual

S-7300A
Please read this manual before making any adjustments.
SINGLE NEEDLE DIRECT DRIVE LOCK STITCHER WITH
ELECTRONIC FEEDING SYSTEM AND THREAD TRIMMER
SERVICE MANUAL

S-7300A
This service manual is intended for S-7300A; be sure to read the S-7300A instruction manual before this manual.
Carefully read the “SAFETY INSTRUCTIONS” below and the whole of this manual to understand this product before you
start maintenance.
As a result of research and improvements regarding this product, some details of this manual may not be the same as those
for the product you purchased.
If you have any questions regarding this product, please contact a Brother dealer.

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.

S-7300A
iii
CAUTION
Sewing
To prevent problems, do not use objects with sharp
points to operate the operation panel.
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 machi
ne 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 ca
n 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.

S-7300A
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.

S-7300A
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.

S-7300A
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. NOTES ON HANDLING.........................2
3. FUNCTION SETTINGS..........................3
3-1. List of special functions when power is
turned on.......................................................... 3
3-2. Memory switch setting method (Advanced) ....5
3-3. List of memory switch settings ........................6
3-4. Energy saving mode setting method .............21
3-5. Input checking method ..................................23
3-6. Output checking method................................ 25
3-7. Protect setting................................................27
3-8. Error history ................................................... 30
3-9. Maintenance information ...............................32
3-10. Software version checking method .............34
3-11. Software version updating method..............35
3-12. Serial number checking method ..................37
4. MECHANICAL DESCRIPTIONS .........38
4-1. Upper shaft and needle bar mechanism .......38
4-2. Lower shaft and rotary hook mechanism ......39
4-3. Feed mechanism ...........................................40
4-4. Lubrication mechanism..................................41
4-5. Thread trimming mechanism .........................42
4-6. Tension release and presser foot mechanism
(Other than premier specifications) ...............47
4-7. Tension release and presser foot mechanism
(Premier specifications) .................................48
4-8. Thread wiper mechanism ..............................49
5. DISASSEMBLY ...................................50
5-1. Knee lifter assembly ......................................50
5-2. Cable tie ........................................................51
5-3. Connector ......................................................51
5-4. Covers ........................................................... 52
5-4-1. Top cover and pulley cover.................52
5-4-2. Panel ...................................................53
5-5. Tension release wire and thread trimmer
solenoid .........................................................54
5-6. Wick holder and oil tube
(-[]0[] specifications only)...............................56
5-7. Oil tank and bed bottom cover ......................57
5-7-1. Oil tank ................................................57
5-7-2. Bed bottom cover................................ 58
5-8. Stand ............................................................. 58
5-9. Needle and presser foot ................................ 59
5-10. Hand switch and X-over seam sensor.........60
5-10-1. Cord holder and Thread wiper
device assembly ...............................60
5-10-2. Fase plate, X-over seam sensor
and Hand switch assembly .............. 61
5-11. Tension mechanism (Other than
premier specifications)................................ 62
5-12. Tension mechanism (Premier
specifications) ............................................. 63
5-13. Needle plate, feed dog, etc. ........................ 64
5-14. Bobbin case, rotary hook and thread
trimmer mechanism..................................... 65
5-15. Feed mechanism ........................................ 66
5-15-1. Disassembling the feed
mechanism ....................................... 66
5-15-2. Disassembling the feed bar unit....... 67
5-16. Presser foot mechanism ............................. 68
5-17. Knee lifter lever mechanism........................ 69
5-18. Tension pulley............................................. 69
5-19. Needle bar and thread take-up
mechanism.................................................. 70
5-20. Pulley and timing pulley U........................... 71
5-21. Main shaft motor ......................................... 72
5-22. Timing belt................................................... 73
5-23. Lower shaft, lower shaft gear and lower
shaft fan ...................................................... 74
5-24. Plunger, rotary hook shaft, rotary hook
shaft gear and thread trimmer cam............. 75
5-25. Thread wiper ............................................... 76
6. ASSEMBLY .........................................77
6-1. Plunger, rotary hook shaft, rotary hook
shaft gear and thread trimmer cam............... 78
6-2. Lower shaft, lower shaft gear and lower
shaft fan ........................................................ 79
6-3. Upper shaft mechanism ................................ 80
6-4. Timing belt..................................................... 81
6-5. Pulley and main shaft motor ......................... 82
6-6. Tension pulley............................................... 85
6-7. Knee lifter lever mechanism.......................... 85
6-8. Needle bar and thread take-up mechanism.. 86
6-9. Presser foot mechanism ............................... 87
6-10. Feed bar unit mechanism ........................... 88
6-11. Feed mechanism ........................................ 89
6-12. Bobbin case, hook and thread trimmer
mechanism.................................................. 93
6-13. Oil tank and bed bottom cover .................... 94
6-13-1. Bed bottom cover ............................. 94
6-13-2. Oil tank ............................................. 95
6-14. Stand........................................................... 96
6-15. Needle and presser foot.............................. 97
6-16. Hand switch and X-over seam sensor ........ 98

S-7300A
6-16-1. Fase plate, X-over seam sensor
and Hand switch assembly ................ 98
6-16-2. Cord holder and Thread wiper
device assembly................................100
6-17. Thread trimmer solenoid and tension
release wire .................................................101
6-17-1. Thread trimmer solenoid assembly...101
6-17-2. Harnesses.........................................102
6-17-3. Tension release wire.........................103
6-18. Tension mechanism (Other than premier
specifications) .............................................. 104
6-19. Tension mechanism (Premier
specifications) .............................................. 105
6-20. Wick holder and oil tube
(-[]0[] specifications only).............................106
6-21. Needle plate, feed dog, etc. ........................106
6-22. Covers. ........................................................107
6-22-1. Panel................................................. 107
6-22-2. Top cover and pulley cover...............108
6-23. Connector. ...................................................109
6-24. Thread wiper................................................ 110
6-25. Knee lifter assembly. ...................................112
7. ADJUSTMENTS ..................................113
7-1. Thread tension spring.................................... 114
7-2. Arm thread guide R .......................................115
7-3. Presser foot height ........................................115
7-4. Adjusting the upper shaft reference
position .......................................................... 116
7-5. Adjusting the feed (position, maximum pitch,
vertical movement, etc.) ................................119
7-5-1. Adjusting the feed motor home
position................................................119
7-5-2. Matching the feed pitch on the panel
with the actual stitch length.................121
7-5-3. Adjusting the reverse stitch length ...... 121
7-5-4. Basic adjustments...............................122
7-5-5. Adjusting the vertical feed amount......125
7-5-6. Adjusting the level feed timing ............126
7-5-7. If the maximum feed pitch is 7 mm
(-[][]5 specifications only) ....................127
7-6. Adjusting the needle bar height.....................128
7-7. Needle and rotary hook timing ......................129
7-8. Adjusting the thread take-up amount
(-[][]3 specifications) ......................................130
7-9. Adjusting the presser foot floating amount
(minute lifting amount) (option)......................131
7-10. Adjusting the thread tension and tension
release wire ...................................................132
7-10-1. Adjusting the lower backup pin
(for tension stud bracket assembly) . 132
7-10-2. Adjusting the tension stud bracket
assembly position ............................. 133
7-10-3. Adjusting the tension release wire
position.............................................. 134
7-10-4. Adjusting the upper backup pin
(for pre-tension assembly)
(Premier specifications) .................... 135
7-10-5. Adjusting the pre-tension assembly
position (Premier specifications)....... 136
7-10-6. Checking after adjustment................ 137
7-11. Adjusting the rotary hook lubrication
amount ........................................................ 138
7-12. Setting method for standard depression
strokes ........................................................ 139
7-13. Adjusting the X-over seam sensor
(Premier specifications) .............................. 140
7-14. Touch key adjustment................................. 142
8. REPLACING PARTS...........................144
8-1. Thread trimming (Other than premier
specifications) ............................................... 144
8-2. Thread trimming knife (Premier
specifications) ............................................... 147
8-3. Main shaft motor ........................................... 151
8-4. Feed motor.................................................... 155
8-5. Feed bar shaft, lifting feed shaft ................... 159
8-6. Panel ............................................................. 160
8-6-1. Replacing panel.................................. 160
8-6-2. Adjusting the tension stud bracket
assembly position ............................... 164
9. APPLYING GREASE
(- []3[] SPECIFICATIONS)...................165
10. ELECTRIC MECHANISM ..................167
10-1. Precautions at the time of adjustment ........ 167
10-2. Connectors.................................................. 168
10-2-1. Connector positions.......................... 168
10-3. Fuse explanation......................................... 170
10-4. Checking the motor and power supply ....... 171
10-5. Checking the solenoids............................... 173
11. TROUBLESHOOTING.......................174
11-1. Troubleshooting .......................................... 174
11-2. List of error codes ....................................... 181

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
P
Specifications
Premier specifications
-333, -433, -333P, -433P,
-303, -403, -303P, -403P
-305, -305P
-405, -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[][]
-[]3[][]
Rotary hook
High-speed spindle
High-speed spindle
Needle bar
Special Brother grease
1260D

S-7300A
2. NOTES ON HANDLING
2
2. NOTES ON HANDLING
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

S-7300A
3. FUNCTION SETTINGS
3
3. FUNCTION SETTINGS
3-1. List of special functions when power is turned on
If you turn on the power switch (1) while pressing a panel key, you can load special functions.
Key operation when power is turned on
Target function
Special menu
・“3-10. Software version checking method”.
・“3-2. Memory switch setting method (Advanced)”.
・“3-5. Input checking method”.
・“3-6. Output checking method”.
・“3-9. Maintenance information”.
・Clearing grease up counter.
・“3-7. Protection setting”.
・
“3-8. Error history.
Initialization mode・・・Refer to the Instruction Manual.
“3-11. Software version updating method”.
Adjustment menu
・“7-12. Setting method for standard depression strokes”.
・“7-4. Adjusting the upper shaft reference position”.
・“7-5. Adjusting the feed (position, maximum pitch, vertical
movement, etc.)”.
・
“7-13. Adjusting the X-over seam sensor”.
“3-12. Serial number checking method”.
“7-14. Touch key adjustment”.
1047D

S-7300A
3. FUNCTION SETTINGS
4
If the power is
turned on without
any key operations
Ｓ
-
７３００Ａ
３０３Ｐ
Turn on power.
1202D

S-7300A
3. FUNCTION SETTINGS
5
3-2. Memory switch setting method (Advanced)
The settings for the memory switches are valid for all programs.
Refer to "3-3. List of memory switch settings" for details on memory switch numbers and settings.
1
<Switching to memory switch setting mode (Advanced)>
1. While pressing the menu key, turn on the power to switch to the special
menu screen.
2. At the special menu screen, selec
t "Memory switch setting" to switch to
memory switch setting mode.
2
<Memory switch setting mode>
1. Press the or key to select the memory switch number (1).
At this time, keep pressing the half stitch key and then press the or x
key at
the same time to display only the memory switches with current
values that are different from their initial values.
2. Press the or key to change the memory switch value (2).
If the value that is displayed is different from the value that is currently set,
the value in the display will flash.
If you would like to return the setting to the initial value, press the Reset
key.
* The Reset key is only displayed when the setting value (the value being
displayed) is different from the initial value.
3. Pre
ss the OK key to store the memory switch setting. The setting display
will change from flashing to illuminated.
3
<Memory switch setting mode exiting method>
・
Press the return key to return to the special menu screen.
4
<Special menu exiting method>
・
At the special menu screen, press the home key to close the special menu
and switch to the home screen.
(1) (2)

S-7300A
3. FUNCTION SETTINGS
6
3-3. List of memory switch settings
Presser foot lifter and treadle settings (001 to 099)
No. Setting range
Initial
value
Setting
units
Setting details
001
ON/OFF
(*1)
－
Presser foot operation when the treadle is returned to the neutral position
after thread trimming
ON: Presser foot is raised
OFF: Presser foot is not raised
(*) The presser foot is raised when MSW-851 is set to "OFF".
002
ON/OFF
OFF
－
Presser foot operation when sewing operation stops at the neutral treadle
position
ON: Presser foot is raised
OFF: Presser foot is not raised
003
ON/OFF
ON
－
Presser foot lifting after treadle is returned to neutral position to stop
sewing and is then depressed backward to the 1st step
ON : Enabled
OFF: Disabled
004
ON/OFF
ON
－
Thread trimming and end backtack sewing when the treadle is depressed
backward
ON: Thread trimming and end backtack sewing operations are enabled
(However, if thread trimming operation is locked, needle up operations
will be carried out without thread trimming.)
OFF: Thread trimming and end backtack sewing operations are disabled
(presser foot lifts when the treadle is depressed backward)
010
ON/OFF
OFF
－
Treadle operation after standing operation pedal is used
(Alternating operation is possible)
(*) For simultaneous operation which includes operation of the presser foot
lifter pedal, operation of the standing operation pedal takes priority.
ON: Treadle operation is still enabled after standing operation pedal has
been used (alternating operation is possible)
OFF: Treadle operation is disabled after standing operation pedal has been
used
011
0
～
1
0
1
Operation when standing up variable speed pedal is ON
0: Sewing speed corresponds to treadle depression amount
1: Sewing speed corresponds to sewing speed set for main sewing
(constant speed)
012
0
～
500
(ms)
80
(ms)
10
(ms)
Delay time from standing pedal turning on until motor starts operating
013
ON/OFF
ON
－
Operation when presser foot lifter pedal is ON and AUTO function is set to
ON
ON: Sewing is interrupted when presser foot lifter pedal turns on (pause
operation)
OFF: No operation
014
ON/OFF
ON
－Operation when high-
speed pedal is pressed slightly and AUTO function is
set to ON
ON: Motor operation switches on/off each time the high-
speed pedal is
depressed slightly to ON and back to OFF
(*) This setting is disabled when MSW-010 is set to "ON".
OFF: Disabled (sewing machine motor does not stop)
015
ON/OFF
ON
－
Presser foot operation using thread trimming pedal after thread is trimmed
ON: Presser foot can be raised and lowered
(*) If MSW-051 is set to "ON", thread trimming pedal operation is disabled
after the presser foot lifter pedal has been operated during standing
operation.
OFF: No operation (only possible using presser foot lifter pedal)
(*1) For other than Europe and America
For Europe and America

S-7300A
3. FUNCTION SETTINGS
7
No. Setting range
Initial
value
Setting
units
Setting details
050
ON/OFF
ON
－
Treadle Forward interlock during thread trimming
ON: Depressing treadle forward during thread trimming is disabled
After the treadle is returned to the neutral position, depressing it
forward is enabled.
OFF: Depressing treadle forward during thread trimming is enabled
051
ON/OFF
(*2)
－
Operation after knee switch is used to raise and lower presser foot
ON: Presser foot can be raised and lowered by depressing the treadle
backward
OFF: Above operation is not possible
055
ON/OFF
(*2)
－
Presser foot operation when machine motor stops with the presser foot in
the raised position, and then the presser foot is lowered and the treadle is
then moved to the neutral position
(*) Displayed when MSW-851 is set to "ON"
ON: Presser foot is raised
(*) The presser foot does not lift when MSW-851 is set to "OFF".
OFF: Presser foot is not raised
057
ON/OFF
(*2)
－
Presser foot operation when treadle is depressed forward to 1st step
(*) Displayed when MSW-852 is set to "ON"
ON: Presser foot is lowered
OFF: Presser foot is not lowered
(*2) For other than Europe and America: ON
For Europe and America: OFF

S-7300A
3. FUNCTION SETTINGS
8
No. Setting range
Initial
value
Setting
units
Setting details
080
-7
～
7
0
1
Treadle backward ON (thread trimming) position (S7)
081
-5
～
5
0
1
Treadle backward ON (presser foot lifting) position (S6)
082
-5
～
5
(*3)
1
Treadle forward 1st step, ON position (S1) (presser foot dropping)
083
-5
～
5
(*3)
1
Treadle forward ON position (S2) (sewing motor start)
084
-5
～
7
0
1
Sewing motor variable speed range starting point (S3) for standing up
variable speed pedal.
085
-7
～
7
0
1
Sewing motor high speed range reaching point (S4) for standing up
variable speed pedal.
086
-2
～
2
0
1
Sewing motor variable speed range starting point (S3) for standing up
variable speed pedal.
087
-2
～
2
0
1 Sewing motor high speed range reaching point (S4) for standing up
variable speed pedal.
088
0
～
3
0
1
Treadle speed curve
0: Constant
1: Curves downward
2: Curves upward
3: S line curve
(*3) For Japan: -5
For other than Japan: 0
3
Speed
Depression stroke
Treadleb backward
stroke
Neutral
Depression stroke
1
2
0
Speed

S-7300A
3. FUNCTION SETTINGS
9
Sewing machine motor settings (100 to 199)
No. Setting range Initial value Setting
units
Setting details
100
OFF, 1
～
3
OFF
1 Slow control after sewing start
OFF: Disabled
1: Only at the sewing start after thread trimming
2: Only when sewing is restarted
3: Usual operation
101
1
～
5
1
1
Degree of slow startup immediately after sewing start
(A larger number means a slower startup)
(*) This is not displayed when MSW-100 is set to "OFF".
102
-10
～
10
(Degrees)
0
(Degrees)
1 Needle up stop position correction value
・
This is not initialized during initialization mode.
103
-10
～
10
(Degrees)
0
(Degrees)
1
Needle down stop position correction value
・
This is not initialized during initialization mode.
150
ON/OFF
ON
－Stop control when treadle is returned to neutral position
ON: Control is carried out to stop quickly in a fixed length of time
* Low speed operating time before sewing stops is almost constant
OFF: Above control is not used
* Low speed operating time before sewing stops is not constant
151
OFF, 1
～
2
1
1
Needle penetration up operation
(Effective hammer operation if needle does not pierce)
OFF: Not used
1: Only needle goes down
(Does not operate during thread trimming
operation)
2: For all movement
(Operation is enabled during thread trimming
operation also)
152
ON/OFF
OFF
－Highest needle position stop operation after thread trimming
ON: Used
OFF: Not used
153
50
～
500
(ms)
150
(ms)
10
(ms)
Delay time after thread trimming from needle up stop until reverse
operation starts.
(*) Only displayed when MSW-152 is set to "ON"
154
-120
～
-40
(Degrees)
-60
(Degrees)
1
Reverse needle up stop position from needle up stop position setting
(*) Only displayed when MSW-152 is set to "ON"
155
0
～
1
0
1
Wiper OPE when reversing highest NEDL and TIMG of presser foot OPE
(*) Only displayed when MSW-152 is set to "ON"
(*) If the setting for MSW-154 is "-120" or "-81", operation will be according
to the "1" setting (the "0" setting is disabled).
0: The needle is raised, then thread wiping is carried out, and then the
presser foot is raised.
1: Thread wiping is carried out before the needle is raised, and the presser
foot is raised after thread wiping is carried out.
170
5
～
12
(A)
9
(A)
1
Current limit value during acceleration
(*
) When a larger value is set, the acceleration of the sewing machine
motor becomes faster.
When a smaller value is set, the acceleration of the sewing machine
motor becomes slower.
(*) Setting a sm
aller value may be effective in preventing fluorescent light
flickering.
171
5
～
12
(A)
7
(A)
1
Current limit value during deceleration
(*
) When a larger value is set, the deceleration of the sewing machine
motor becomes faster.
When a smaller value is set,
the deceleration of the sewing machine
motor becomes slower.
172
-3
～
6
0
1
Gain during high-speed motor operation
173
-3
～
6
3
1
Gain during low-speed motor operation
174
-3
～
9
6
1
Gain during thread trimming