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S-7100A
SINGLE NEEDLE DIRECT DRIVE STRAIGHT LOCK STITCHER
WITH THREAD TRIMMER
INSTRUCTION MANUAL
Please read this manual before using the machine.
Please keep this manual within easy reach for quick reference.
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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-7100A
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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
situations where failure to follow the
) indicates something that you should be careful of. The picture inside the triangle
do. The picture inside the circle indicates 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 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
nature of the thing that must be done.
instructions will result in death or serious injury.
instructions could result in death or serious injury.
The instructions which follow this term indicate
instructions may result in minor or moderate injury.
S-7100A
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[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
nd 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
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.
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 32 kg
(70lb). 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.
Installation
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, a
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.
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.
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
vomiting and diarrhea.
Keep the oil out of the reach of children.
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CAUTION
Sewing
This sewing machine should 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
may result in 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
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
carry out any maintenance and inspection of the
When carrying out inspection, adjustment and
you touch the surface of the motor, it may cause
If the power switch needs to be left on when
Use both hands to hold the machine head when
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
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.
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.
Cleaning
Attach all safety devices before using the sewing
devices attached, injury may result.
Do not touch any of the moving parts or press any
objects against the machine while sewing, as this
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.
If the machine develops a problem, contact your
nearest Brother dealer or a qualified technician.
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.
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
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.
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 motor cover. If
burns.
carrying out some adjustment, be extremely careful
to observe all safety precautions.
Maintenance and inspection
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 replacing parts and installing optional
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.
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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
its original
position after it has been tilted.
3
Be careful to avoid injury from
6
High temperature warning
7
Be sure to connect the ground. If
the ground connection is not
high risk of
receiving a serious electric
shock, and problems with correct
8
Direction of operation
* Safety devices:
(A) Finger guard (C) Motor cover
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
9
machine head to
5
S-7100A
the moving thread take-up.
display
secure, you run a
operation may also occur.
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v
Control box
Oil tank
Transformer box
(100 V/400 V system only)
0591D
S-7100A
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CONTENTS
1. MACHINE SPECIFICATIONS .................. 1
2. INSTALLATION ............................................ 2
2-1. Table processing diagram ............................. 3
2-2. Installation .................................................... 3
2-3. Lubrication .................................................... 6
2-4. Connecting the cords ..................................... 7
2-4-1. Connecting the cords ................................. 7
2-4-2. Other cords .................................................. 8
3. USING THE OPERATION PANEL
(BASIC OPERATIONS) ............................. 12
3-1. Names and functions .................................... 12
3-2. Sewing start and end backtack stitches ...... 14
3-3. Sewing continuous backtack stitches .......... 15
4. USING THE OPERATION PANEL
(ADVANCED OPERATIONS) .................. 16
4-1. Switching the 4-column display ................... 16
4-2. Setting the sewing speed .............................. 16
4-2-1. Setting the maximum sewing speed ....... 16
4-2-2. Setting the start backtack
sewing speed ............................................... 17
4-3. Setting the counters ...................................... 18
4-3-1. Lower thread counter ................................ 18
4-3-2. Thread trimming counter ......................... 19
4-3-3. Needle replacement counter .................... 20
4-4. Setting basic functions .................................. 21
4-4-1. Changing the needle stop position .......... 21
4-4-2. Correction sewing ....................................... 22
4-4-3. Setting thread wiping ................................ 23
4-5. Adjusting the needle up stop position.......... 24
4-6. Resetting all settings to their defaults ........ 25
7-8. Adjusting the rotary hook lubrication
amount .......................................................... 33
8. TROUBLESHOOTING ................................ 34
8-1. Sewing ........................................................... 34
8-2. Error code displays ....................................... 38
9. 7-SEGMENT DISPLAY ............................... 42
5. CLEANING ...................................................... 26
6. REPLACING THE FIXED KNIFE
AND MOVABLE KNIFE .............................. 27
7. STANDARD ADJUSTMENTS .................. 28
7-1. Adjusting arm thread guide R ...................... 28
7-2. Adjusting the presser foot height ................. 29
7-3. Adjusting of the feed dog height .................. 30
7-4. Adjusting the feed dog angle ........................ 30
7-5. Adjusting the needle bar height ................... 31
7-6. Adjusting the needle and feed
mechanism timing ........................................ 31
7-7. Adjusting the needle and rotary hook
timing ............................................................. 32
S-7100A
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S-7100A
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1. MACHINE SPECIFICATIONS
1
3
4
Quick reverse
○
Thread wiper
3
3A
5
For light to
medium-weight materials
For medium-weight
materials
For heavy-weight
materials
Max. sewing speed
5,000 sti/min
4,000 sti/min
Sewing speed at the time of shipment
4,000 sti/min
Start backtacking and continuous
backtacking speed
End backtacking speed
1,800 sti/min
Max. stitch length
4.2 mm
5 mm
Lifting lever
6 mm
Knee lifter
13 mm
Feed dog height
0.8 mm
1.0 mm
1.2 mm
Needle (DB x 1, DP x 5)
#11 - #18
#19 - #22
Motor
AC servo motor (4-pole, 450 W)
Control circuit
Microprocessor
0989D
1. MACHINE SPECIFICATIONS
Use
220 - 3,000 sti/min
○
○
Presser foot height
S-7100A
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2. INSTALLATION
2
CAUTION
Machine installation should only be carried out by a
approximately 32 kg
. The installation should be carried out by two
Do not connect the power cord until installation is
Secure the table so that it will not move when tilting
back the machine head. If the table moves, it may
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
2101B
2089M
0475D
0476D
2. INSTALLATION
qualified technician.
Contact your Brother dealer or a qualified electrician
for any electrical work that may need to be done.
The sewing machine weighs
(70lb)
or more people.
complete. The machine may operate if the treadle is
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
may get caught.
Carrying the machine
・ The sewing machine should be carried by the arm and the motor
cover by two people as shown in the illustration.
* Do not hold by any part other than the motor cover. If this is not
observed, it may result in damage to the sewing machine.
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.
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.
S-7100A
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2. INSTALLATION
3
0478D
Control box
mounting
Cotton stand hole
Head rest hole
Cord hole
0592D
2-1. 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.
hole
2-2. Installation
1. Control box + Oil pan
(1) Control box
(2) Bolts [4 pcs]
(3) Nuts [4 pcs]
(4) Spring washers [4 pcs]
(5) Washers [4 pcs]
2. Connecting rod
(6) Connecting rod
(7) Nut
S-7100A
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2. INSTALLATION
4
0479D
0480D
3. Rubber cushions
(1) Rubber cushions [2 pcs]
(2) Nails [4 pcs]
(3) Head cushions (left) [2 pcs]
(4) Head cushions (right) [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.
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2. INSTALLATION
5
0482D
Within 13 mm
0481D
5. 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 is approximately 2 mm when the knee lifter
plate (4) is gently pressed.
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 13
mm of the needle plate when the knee liter plate is fully
pressed.
8. After adjustment is completed, securely tighten the nut
(6).
S-7100A
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2. INSTALLATION
6
CAUTION
power cord until lubrication has been completed, otherwise the machine may operate if the
If care is not taken, inflammation can result. Furthermore, do not drink the lubricating oil. Diarrhea or vomiting may
0483D
2-3. Lubrication
Do not connect the
treadle is depressed by mistake, which could result in injury.
Be sure to wear protective goggles and gloves when handling the lubricating oil, so that it does not get into your
eyes or onto your skin.
result.
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. Tilt back the machine head.
5. Remove the rubber cap (3), and pour lubricating oil into
the oil tank (4) until it reaches the upper reference line (5).
(Approx. 150 ml)
6. Replace the rubber cap (3).
7. Return the machine head to its original position.
NOTE:
When the machine head is tilted back at times such as the
following, lubricating oil may leak out from the oil pan (6).
1) If the machine head is tilted back immediately after
sewing;
2) If the machine head is tilted back a long way when the
head rest has been removed;
3) If lubricating oil is added until the oil level goes above
the upper reference line (5) on the oil tank (4).
<Lubrication oil replenishment interval>
If the oil level drops below the lower reference line (7) on the
oil tank (4), be sure to replenish the oil.
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2. INSTALLATION
7
CAUTION
Do not connect the power cord until all cords have
machine may operate if the treadle is depressed
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
Be sure to connect the ground. If the ground
risk of
receiving a serious electric shock, and problems with
correct operation may also occur.
0587D
0586D
Push in securely until the tabs (6)
engage.
Lower the tab (6).
Ground symbol
Green and yellow wire (ground wire)
Align the flat edges
2-4. Connecting the cords
Contact your Brother dealer or a qualified electrician
for any electrical work that may need to be done.
been connected.
The
by mistake, which could result in injury.
2-4-1. Connecting the cords
shocks could occur.
connection is not secure, you run a high
1. Cords
(1) 8-pin operation panel connector
(2) 10-pin resolver connector
(3) 12-pin solenoid connector
(4) 4-pin motor connector
(5) 3-pin power supply connector
S-7100A
2. Ground wire
(1) Ground wire
(2) Screw
(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:
For Europe specifications,
Americas 220 V specifications and
100 V/400 V system specifications,
refer to “2-4-2. Other cords”.
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2. INSTALLATION
8
0486D
Green and yellow wire (ground wire)
Control box
Leg
<Seen from underneath table>
2-4-2. Other cords
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.
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2. INSTALLATION
9
0588D
3. Install the cores (10) in the two
places shown in the illustration.
(10) Core [2 pcs]
(11) Screws [2 pcs]
(12) Washers [2 pcs]
(13) Nuts [2 pcs]
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2. INSTALLATION
10
Operator
4145M
Green and yellow
wire (ground wire)
0589D
<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.
S-7100A
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2. INSTALLATION
11
Green and yellow
wire (ground wire)
4145M
Operator
0590D
<For 100V/400V system specifications>
(1) Power switch
(2) Screws [2 pcs]
(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.
S-7100A
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3. USING THE OPERATION PANEL (BASIC OPERATIONS)
12
(1)
Display
When start backtack stitches are being displayed, the indicator of the start backtack key
) will illuminate, and the number of A stitches will appear in the A column and the
When end backtack stitches are being displayed, the indicator of the end backtack key
When continuous backtack stitches are displayed, the indicator of the continuous
ndicators on the right side of the window show which value is appearing in
column display shows the speed, counter and
(2)
SEL (Select) key
The value in the display (1) can be changed each time this switch is pressed.
(3)
Setting keys
These keys are used to set the number of backtack stitches for A, B, C and D.
If you press the key once more when “9” is displayed, the value will return to “0”.
(4)
Start backtack key
When this key is pressed so that the indicator illuminates, the number of start backtack
(5)
End backtack key
When this key is pressed so that the indicator illuminates, the number of end backtack
depressed backward, the end backtack stitches are sewn and then the thread is trimmed
(6)
Continuous backtack key
When this key is pressed so that the indicator illuminates, the number of backtack stitches
machine sews a full cycle of stitches set by A, B, C and D, the thread is trimmed
Power indicator
0490D
0489D
0491D
0495D
0494D
0493D
0492D
3. USING THE OPERATION PANEL (BASIC OPERATIONS)
3-1. Names and functions
・ The operation panel keys cannot be operated while sewing is in progress.
Select the keys and set the number of stitches before starting sewing.
・ In the case of keys with indicators, the indicator illuminates when that function is operating, and the indicator switches off
when the key is pressed once more.
The power indicator illuminates when the power switch is turned on.
・
(4
number of B stitches will appear in the B column.
・
(5) will illuminate, and the number of C stitches will appear in the C column and the
number of D stitches will appear in the D column.
・
backtack key (6) will illuminate, and the number of A, B, C and D stitches will appear in
order starting from the left column of the display.
・ The three i
the four columns of the display. The fourstitches. When the stitches are being displayed, the ABCD indicator (10) will illuminate.
・ When the key is pressed, the setting increases from 0 up to 9.
・
stitches (0 - 9) in the A and B columns of the display are sewn.
stitches (0 - 9) in the C and D columns of the display are sewn. When the treadle is
automatically.
If the treadle has not yet been depressed backward, the end backtack function can be set
to ON, the number of stitches can be changed and the function can be set back to OFF.
(0 - 9) in the A, B, C and D columns of the display are sewn continuously. After the sewing
automatically.
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3. USING THE OPERATION PANEL (BASIC OPERATIONS)
13
(7)
Thread trimming disable/F1 key
When this key is pressed so that the indicator illuminates, the sewing machine stops in the
(8)
Slow start/F2 key
When this key is pressed so that the indicator illuminates, sewing is carried out at 700
(9)
Half stitch key
When the sewing machine is stopped, the needle bar can be moved up and down by
0496D
0497D
0498D
Power indicator
0489D
needle up position without thread trimming being carried out even if the treadle is
depressed backward.
sti/min for the first two stitches at the next sewing start after thread trimming.
After this, the sewing speed corresponds to the treadle depression amount.
pressing this key.
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3. USING THE OPERATION PANEL (BASIC OPERATIONS)
14
1
2
3
Start backtacking is carried out. After it has finished, normal sewing continues for as long as
position, the sewing machine will continue
4
End backtacking is carried out. After it has finished, the thread is trimmed automatically and
If the treadle is depressed backward before sewing of the set number of start backtack
0841M
For example,
Example:
2159M
2160M
0499D
0500D
3-2. Sewing start and end backtack stitches
Setting start backtack stitches
3 stitches and
4 stitches
Setting end backtack stitches
the treadle remains depressed.
NOTE:
the sewing machine stops in the needle up position.
NOTE:
・
・ If thread trimming lock is set, the sewing machine will stop in the needle up position
If the treadle is returned to the neutral
operating until the set number of start backtack stitches has been sewn.
stitches is complete, end backtacking will not be carried out.
without thread trimming being carried out.
S-7100A
Page 25
3. USING THE OPERATION PANEL (BASIC OPERATIONS)
15
1
2
continuously, the number of stitches set for A, B, C and D
will be sewn in a single cycle, the thread will be trimmed automatically and then the needle
carried out, the sewing machine will stop at the point where the treadle returns to the
If the treadle is depressed again, operation will resume from the point
trimming lock is set, the sewing machine will stop in the needle up position
2159M
0501D
3655M
Example:
3-3. Sewing continuous backtack stitches
Setting continuous backtack stitches
If the treadle is simply depressed
bar will stop in the needle up position.
NOTE:
・ If the treadle is returned to the neutral position while continuous backtacking is being
neutral position.
where it was interrupted.
・ If thread
without thread trimming being carried out.
S-7100A
Page 26
4. USING THE OPERATION PANEL (ADVANCED OPERATIONS)
16
1
2
0502D 0503D 0504D
0505D
0506D
4. USING THE OPERATION PANEL (ADVANCED OPERATIONS)
The operations described in this section should only be carried out by a technician.
4-1. Switching the 4-column display
・ The 4-column data in the display can be changed to one of the following three statuses each time the SEL key is pressed.
Stitch number display or no display Sewing speed display Counter display
・ When the sewing speed display/counter display appears, you can press the FUNC key to switch to another display.
Display mode
No display
Stitch number
display
Sewing speed
display
Counter display
ON ABCD stitch number display
ON Maximum sewing speed setting value
ON ON Start backtack sewing speed setting value
ON Lower thread counter value
Flashing Lower thread counter warning enabled
ON ON Thread trimming counter value
ON ON Needle replacement counter value
Flashing Flashing Needle replacement counter warning enabled
4-2. Setting the sewing speed
4-2-1. Setting the maximum sewing speed
Press the SEL key so that the SPEED indicator is illuminated.
Four columns display
・ The maximum sewing speed setting value
will appear in the four columns of the
display.
Press the A or B key to change the setting value.
・ When the B key is pressed, the setting
increases by 100.
・ When the A key is pressed, the setting
decreases by 100.
NOTE:
The setting range is from 220 to 4000
sti/min.
S-7100A
Page 27
4. USING THE OPERATION PANEL (ADVANCED OPERATIONS)
17
1
Press the SEL key so that the SPEED indicator is illuminated.
2
Press the FUNC key.
3
Press the A or B key to change the setting value.
0505D
0508D
0507D
4-2-2. Setting the start backtack sewing speed
・ The maximum sewing speed setting value
will appear in the four columns of the
display.
・ The ABCD indicator will illuminate and the
start backtack sewing speed setting value
will appear in the four columns of the
display.
NOTE:
If the FUNC key is pressed once more,
the ABCD indicator will switch off and the
display will return to the maximum sewing
speed setting value.
・ When the B key is pressed, the setting
increases by 100.
・ When the A key is pressed, the setting
decreases by 100.
NOTE:
The setting range is from 220 to 3000
sti/min.
S-7100A
Page 28
4. USING THE OPERATION PANEL (ADVANCED OPERATIONS)
18
1
Press the SEL key so that the COUNT indicator is illuminated.
2
Press the ENTER key for 2 seconds or more, and then press the
0509D
0511D
(Press for 2 seconds or more.)
0510D
4-3. Setting the counters
The lower thread counter, thread trimming counter and needle replacement counter can be displayed.
The three counters can be operated at the same time.
4-3-1. Lower thread counter
The lower thread counter can be used to let you know approximately how much lower thread is remaining.
<Setting the lower thread counter initial value>
C or D key to set the initial value.
・ The lower thread counter value will appear
in the four columns of the display.
・ When the D key is pressed, the setting
increases by 1.
・ When the C key is pressed, the setting
decreases by 1.
NOTE:
・ The setting range is from 0 to 9999.
・ If an initial value of “0” is set, the lower
thread counter will not operate.
<Lower thread counter operation>
・ The lower thread counter is reduced by 1 from the initial setting value each time the sewing machine sews 10 stitches,
and a warning is given when the counter goes below“0”.
・ Sewing will be possible even after the treadle is returned to the neutral position and the sewing machine stops. However,
after the treadle has been depressed backward and thread trimming has been carried out, sewing using the treadle will no
longer be possible.
If the treadle is depressed at this time, “ Ent” will appear in the display. When the treadle is returned to the neutral position,
the display will return to the current counter display.
・ If the ENTER key is pressed while the lower thread counter is displayed, the COUNT indicator will change to illuminated
and sewing can then be carried out using the treadle.
If the ENTER key is pressed again for 2 seconds or more, the counter display will return to the initial value and counting
from the initial value will be possible.
When the warning occurs, the COUNT indicator flashes,
and a buzzer sounds for 5 seconds.
S-7100A
Page 29
4. USING THE OPERATION PANEL (ADVANCED OPERATIONS)
19
1
Press the SEL key so that the COUNT indicator is illuminated.
2
When the FUNC key is pressed once, the thread trimming counter
3
After the thread trimming operation is complete, the counter will be
4
When the thread trimming counter is displayed, you can press the
0509D
0512D
0513D
4-3-2. Thread trimming counter
The lower thread counter can be used to let you know approximately how many items can be sewn.
・ The lower thread counter value will appear
in the four columns of the display.
display will appear.
incremented.
C or D key to adjust the counter value (0 to 9999).
・ The thread trimming counter will appear in
the four columns of the display.
NOTE:
The counter is incremented even if thread
trimming is set to disabled.
・ When the D key is pressed, the counter
value increases by 1.
・ When the C key is pressed, the counter
value decreases by 1.
S-7100A
Page 30
4. USING THE OPERATION PANEL (ADVANCED OPERATIONS)
20
1
Press the SEL key so that the COUNT indicator is illuminated.
2
When the FUNC key is pressed two times, the needle replacement
3
Press the ENTER key for 2 seconds or more, and then press the
0509D
0514D
0515D
0516D
(
(
4-3-3. Needle replacement counter
<Setting the needle replacement counter initial value>
・ The lower thread counter value will appear
in the four columns of the display.
counter display will appear.
Press two times.)
C or D key to set the initial value.
Press for 2 seconds or more.)
<Needle replacement counter operation>
・ The needle replacement counter is reduced by 1 from the initial setting value each time the sewing machine sews 100
stitches, and a warning is given when the counter goes below“0”.
・ The needle replacement counter value will
appear in the four columns of the display.
・ When the D key is pressed, the setting
increases by 1.
When the C key is pressed, the setting
decreases by 1.
NOTE:
・ The setting range is from 0 to 9999.
・ If an initial value of “0” is set, the needle
replacement counter will not operate.
・ Sewing will be possible even after the treadle is returned to the neutral position and the sewing machine stops. However,
after the treadle has been depressed backward and thread trimming has been carried out, sewing using the treadle will no
longer be possible.
If the treadle is depressed at this time, “Ent” will appear in the display.
When the treadle is returned to the neutral position, the display will return to the current counter display.
・ If the ENTER key is pressed while the needle replacement counter is displayed, the COUNT indicator and the ABCD
indicator will change to illuminated and sewing can then be carried out using the treadle.
If the ENTER key is pressed again for 2 seconds or more, the counter display will return to the initial value and counting
from the initial value will be possible.
When the warning occurs, the COUNT indicator and the ABCD
indicator flash, and a buzzer sounds for 5 seconds.
S-7100A
Page 31
4. USING THE OPERATION PANEL (ADVANCED OPERATIONS)
21
Four columns
display
Needle down
stop
Setting can be carried out by pressing the
slow start/F2 key.
Setting can be carried out by pressing the
thread trimming/F1 key.
Needle tip illumination lamp brightness
adjustment
Fully
illuminated
1
Activating setting mode
2
Setting the needle up stop and needle down stop positions
the ABCD indicator will switch off and the
3
The setting will be stored and the display will
4
Setting mode will be exited and normal
0519D
0520D
(Setting item)
(Setting item)
(Setting value)
0517D
0518D
4-4. Setting basic functions
If you turn on the power switch while pressing the thread trimming disable/F1 key, you can then make the following settings.
Setting item
Needle stop position
Correction
Slow start
Thread trimming disable
Thread wiping
Updn
Corr
SLoW
trdi
WiP
LAMP
Initial value Reference item
Refer to”4-4-1”.
None Refer to”4-4-2”.
None
None
Enabled Refer to”4-4-3”.
Refer to the Service Manual.
4-4-1. Changing the needle stop position
This sets whether the needle bar stops in the needle up stop position or the needle down stop position when the treadle is
returned to the neutral position and sewing stops.
(While pressing the thread trimming disable/F1 key, turn on the
power switch.)
・ When the D key is pressed, the “UP”
display will appear.
・ When the C key is pressed, the “dn”
display will appear.
… Needle up stop
… Needle down stop
NOTE:
If the SEL key (1) is pressed once more,
display will return to the setting item.
return to the setting item.
operation will be possible.
S-7100A
Page 32
4. USING THE OPERATION PANEL (ADVANCED OPERATIONS)
22
1
Activating setting mode
2
Selecting “Corr” (correction sewing)
3
Enabling and disabling correction sewing
If the SEL key (1) is pressed once more,
4
The setting will be stored and the display will
5
Setting mode will be exited and normal
0521D
0523D
(Setting item)
(Setting item)
(Setting value)
(
)
(Setting item)
0517D
0520D
0518D
4-4-2. Correction sewing
When correction sewing is enabled, sewing will be carried out at slow speed (220 sti/min) while the actuator switch is being
pressed when the sewing machine is stopped.
(While pressing the thread trimming disable/F1 key, turn on the
power switch.)
Press once
・ When the D key is pressed, the next
setting is displayed.
・ When the C key is pressed, the
previous setting is displayed.
・ When the D key is pressed, the “on”
display will appear.
・ When the C key is pressed, the “oFF”
display will appear.
… Correction sewing enabled
… Correction sewing disabled
NOTE:
the ABCD indicator will switch off and the
display will return to the setting item.
return to the setting item.
operation will be possible.
S-7100A
Page 33
4. USING THE OPERATION PANEL (ADVANCED OPERATIONS)
23
1
Activating setting mode
2
Selecting “WiP” (thread wiping)
3
Enabling and disabling thread wiping
4
The setting will be stored and the display will
5
Setting mode will be exited and normal
0517D
0524D
0522D
0525D
(Setting item)
(Press four times)
0520D
(Setting item)
(Setting item)
(Setting value)
4-4-3. Setting thread wiping
The initial setting value is ON.
If the thread wiper is connected but thread wiping is not to be carried out, change this setting to OFF.
(While pressing the thread trimming disable/F1 key, turn on the
power switch.)
・ When the D key is pressed, the next
setting is displayed.
・ When the C key is pressed, the
previous setting is displayed.
・ When the D key is pressed, the “on”
display will appear.
・ When the C key is pressed, the “oFF”
display will appear.
… Thread wiping enabled
… Thread wiping disabled
NOTE:
If the SEL key (1) is pressed once more, the
ABCD indicator will switch off and the
display will return to the setting item.
return to the setting item.
operation will be possible.
S-7100A
Page 34
4. USING THE OPERATION PANEL (ADVANCED OPERATIONS)
24
1
(While pressing the key
, turn on the power switch.)
“MorG” will appear in the display (2).
2
Selecting “UPoS”
3
Needle up stop position setting
4
The setting will be stored and the display will
5
Normal sewing machine operation will then be
Becomes higher
Becomes lower
(Setting value)
(Setting item)
(Setting item)
Example
0528D 0529D
0526D
0527D
0530D
0520D
(Press once)
4-5. Adjusting the needle up stop position
(1)
・ If the D key is pressed, the setting value
will increase and the needle up stop position
will become lower.
・ If the C key is pressed, the setting value
will decrease and the needle up stop position
will become higher.
・ The setting range is from –5 to 10.
NOTE:
A setting value of “10” corresponds to an
angle of rotation of approximately 10° for the
upper shaft.
* For details on other adjustment items, refer to the Service Manual.
return to the setting item.
possible.
S-7100A
Page 35
4. USING THE OPERATION PANEL (ADVANCED OPERATIONS)
25
4-6. Resetting all settings to their defaults
If the sewing machine stops operating normally, the cause may be that an incorrect setting may have been made for the
memory data by means of memory switches, for instance. In such cases, it may be possible to restore normal operation by
following the steps given below to initialize the memory setting data.
1. While pressing the continuous backtack key, turn on the power switch.
The mode wills witch to initialization mode and “1. ALL” will appear in the main display.
2. Press the C or D key to select an item to be initialized.
Main display Initialization item
1.ALL
2.MEM
3.SPD
4.SEW
3. Press the ENTER key for 2 seconds or more.
Once initialization is complete, the main display will change to display “End”.
4. Press the FUNC key.
Initialization mode will be exited and normal sewing machine operation will then be possible.
* For details on initialization items other than “1. ALL”, refer to the Service Manual.
Clear all
Memory switch initialization
Sewing speed initialization
Program initialization
S-7100A
Page 36
5. CLEANING
26
CAUTION
Be sure to wear protective goggles and gloves when handling the lubricating oil and grease, so that they do not get
ircumstances, as they can cause vomiting and
Secure the table so that it will not move when tilting back the machine head. If the table moves, it may crush your
ds to hold the machine head when tilting it back or returning it to its original position. If only one hand
0531D
0532D
. CLEANING 5
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.
into your eyes or onto your skin, otherwise inflammation can result.
Furthermore, do not drink the oil or eat the grease under any c
diarrhea.
Keep the oil out of the reach of children.
feet or cause other injuries.
Use both han
is used, the weight of the machine head may cause your hand to slip, and your hand may get caught.
The following cleaning operations should be carried out each day in order to maintain the performance of this machine and to
ensure a long service life. Furthermore, if the sewing machine has not been used for a long period of time, carry out the
following cleaning procedures before using it again.
1. If the oil level drops below the lower reference line (2) on
the oil tank (1), be sure to replenish the oil.
(Refer to “2-3.
2. Return the machine head to its original position.
3. Replace the needle if it is bent or if the tip is broken.
4. Check that the upper threads have been threaded
correctly.
5. Carry out a test sewing.
Lubrication”.)
S-7100A
Page 37
6. REPLACING THE FIXED KNIFE AND MOVABLE KNIFE
27
CAUTION
Turn off the power switch and disconnect the power cord from the wall outlet before replacing any parts, otherwise
3889M
2310M
0542D
0541D
.
REPLACING THE FIXED KNIFE AND MOVABLE KNIFE
Replacement of parts should only be carried out by a qualified technician.
the machine may operate if the treadle is pressed by mistake, which could result in injury.
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.
<Fixed knife>
1. Tilt back the machine head.
2. Remove the screw (1), and then remove the rotary hook
stopper (2).
3. Remove the screw (3), and then remove the fixed knife
(4).
NOTE:
Carry out the above steps in reverse to install the fixed
knife (4).
Sharpening the fixed knife
If the cutting performance deteriorates, sharpen the fixed
knife (4) on a whetstone (5) as shown in the illustration.
<Movable knife>
1. Remove the needle.
2. Lift up the presser foot using the lifting lever.
3. Remove the two screws (1), and then remove the needle
plate (2).
4. Turn the machine pulley to raise the needle bar to its
highest position.
5. Tilt back the machine head.
6. Push the thread trimmer connecting rod (3) in the
direction of the arrow until the two screws (4) can be
seen.
7. Remove the two screws (4), and then remove the
movable knife (5).
NOTE:
Carry out the above steps in reverse to install the
movable knife (5).
6
S-7100A
Page 38
7. STANDARD ADJUSTMENTS
28
CAUTION
Maintenance and inspection of the sewing machine
carry out any maintenance and inspection of the
If any safety devices have been removed, be
install them to their original
positions and check that they operate correctly
Secure the table so that it will not move when tilting
Use both hands to hold the machine head when
only one hand is used, the weight of the machine
head may cause your hand to slip, and your hand
Turn off the power switch and disconnect the power
cord from the wall outlet at the following times,
When carrying out inspection, adjustment and
Always be sure to turn off the power switch and then
wait one minute before opening the motor cover. If
you touch the surface of the motor, it may cause
If the power switch needs to be left on when carrying
out some adjustment, be extremely careful to
Becomes greater
0533D
7. STANDARD ADJUSTMENTS
should only be carried out by a qualified technician.
Ask your Brother dealer or a qualified electrician to
electrical system.
absolutely sure to re-
before using the machine.
otherwise the machine may operate if the treadle is
depressed by mistake, which could result in injury.
・
・ When replacing consumable parts such as the
maintenance
rotary hook and knife
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
may get caught.
7-1. Adjusting arm thread guide R
burns.
observe all safety precautions.
The standard position of arm thread guide R (1) is the
position where the screw (2) is in the center of the adjustable
range for arm thread guide R (1).
NOTE:
To adjust the position, loosen the screw (2) and then
move arm thread guide R (1).
・ When sewing thick material, move arm thread guide R
(1) to the left. (The thread take-up amount will become
greater.)
・ When sewing thin material, move arm thread guide R
(1) to the right. (The thread take-up amount will
become less.)
S-7100A
Page 39
7. STANDARD ADJUSTMENTS
29
Needle
0534D
7-2. Adjusting the presser foot height
The standard height of the presser foot (1) is 6 mm when the
presser foot (1) is raised by means of the lifting lever (2).
1. Loosen the nut (3) of the adjustment screw (4), and then
turn the adjustment screw (4) so that there is no pressure
applied to the presser foot.
2. Raise the lifting lever (2). The presser foot (1) will also
rise.
3. Remove the oil cap (5).
4. Loosen the bolt (6) and then move the presser bar (7) up
or down until the presser foot (1) is at the standard height
of 6 mm.
5. Tighten the bolt (6).
6. Replace the oil cap (5).
7. Adjust the presser foot pressure using the adjustment
screw (4), and then tighten the nut (3).
NOTE:
After adjusting, check that the needle moves down into
the center of the groove in the presser foot.
S-7100A
Page 40
7. STANDARD ADJUSTMENTS
30
Becomes higher
Becomes lower
<-[]03>
<
<
1.2mm
3862M
0543D
Lower
the front
Raise
t
Standard
3865M
0544D
7-3. Adjusting of the feed dog height
0.8mm
-[]03A>
1.0mm
-[]05>
The standard height of the feed dog (1) when it is raised as
far as possible above the surface of the needle plate is 0.8
mm for -[]03 specifications, 1.0 mm for -[]03A specifications
and 1.2 mm for -[]05 specifications.
1. Turn the pulley until the feed dog (1) rises to the highest
position.
2. Tilt back the machine head.
3. Loosen the screw (2).
4. Turn the feed lifting shaft crank (3) to move the feed
bracket (4) up and down.
5. Tighten the screw (2).
7-4. Adjusting the feed dog angle
he front
The standard angle for the feed dog (1) when it is at its
highest position above the needle plate is when the “
” mark
on the shaft (2) is aligned with the feed rocker bracket arm
(3) and the feed dog (1) is parallel to the needle plate.
1. Turn the machine pulley to move the feed dog (1) to its
highest position above the needle plate.
2. Tilt back the machine head.
3. Loosen the two set screws (4).
4. Turn the shaft (2) in the direction of the arrow within a
range of 90° with respect to the standard position.
・ In order to prevent puckering, lower the front of the feed
dog (1). (Fig. [A])
・ In order to prevent the material from slipping, raise the
front of the feed dog (1). (Fig. [B])
5. Securely tighten the set screws (4).
NOTE:
The height of the feed dog (1) will change after the angle
has been adjusted, so it will be necessary to re-adjust
the height of the feed dog (1).
S-7100A
Page 41
7. STANDARD ADJUSTMENTS
31
0535D
<-[]03>
<-[]05>
Approx. 3 mm
0536D
Flush with top
plate
<-[]03A>
Approx. 1 mm
(Standard)
Needle timing is
advanced
Needle timing
is retarded
7-5. Adjusting the needle bar height
Reference line (a), which is the second line from the bottom
of the needle bar (1) (fourth line from the bottom when using
a DA x 1 needle) should be aligned with the lower edge of
the needle bar bush D (2) as shown in the illustration when
the needle bar (1) is at its lowest position.
1. Turn the machine pulley to set the needle bar (1) to its
lowest position.
2. Remove the oil cap (3).
3. Loosen the screw (4) and then move the needle bar (1) up
or down to adjust its position.
4. Securely tighten the screw (4).
5. Replace the oil cap (3).
7-6. Adjusting the needle and feed mechanism timing
The illustration at left shows the standard position for the
needle tip when the feed dog (1) is lowered from its highest
position until it is flush with the top of the needle plate (2).
1. Remove the rubber cap (3).
2. Loosen the two set screws (5) of the vertical cam (4), and
then turn the vertical cam (4) slightly to adjust the timing.
of needle
・ To advance the needle timing, turn in the direction of
<A>. To retard the needle timing, turn in the direction
of <B>.
・ To prevent material slippage from occurring, retard the
needle timing. (Fig. [B])
・ To improve thread tightening, advance the needle
timing. (Fig. [A])
NOTE:
If the vertical cam (4) is turned too far in the direction
of <A>, it may cause the needle to break.
3. After adjusting, securely tighten the set screw (5).
4. Replace the rubber cap (3).
S-7100A
Page 42
7. STANDARD ADJUSTMENTS
32
2291M
2290M
<-[]03>
<
3869M
0.5 - 0.7 mm
7-7. Adjusting the needle and rotary hook timing
The tip of the rotary hook (3) should be aligned with the
center of the needle (4) when the needle bar (1) moves up
1.8 mm (2.2 mm for –[]03A and –[]05 specifications) from its
lowest position to the position where reference line (b) is
aligned with the lower edge of the needle bar bush (2) as
shown in the illustration. (The distance from the upper edge
of the needle hole to the rotary hook tip will be 0.5 to 0.7 mm
at this time.)
1. Turn the machine pulley to raise the needle bar (1) from
1.8 mm
-[]05>
2.2 mm
its lowest position until reference line (b) is aligned with
the lower edge of the needle bar bush D (2) as shown in
the illustration.
2. Loosen the set screws (5), and then align the tip of the
rotary hook (3) with the center of the needle (4).
The distance between the tip of the rotary hook (3) and
the needle (4) should be approximately 0 - 0.05 mm.
3. Securely tighten the set screws (5).
S-7100A
Page 43
7. STANDARD ADJUSTMENTS
33
CAUTION
check sheet against moving parts such as the rotary
hook or the feed mechanism when checking the amount of oil supplied to the rotary hook, otherwise injury may
result.
0537D
2303M
Approx. 25 mm
Approx. 70 mm
Too little
Spattered oil
Too much
Correct
2304M
Bed
5 - 10 mm
0935M
Less oil
More oil
7-8. Adjusting the rotary hook lubrication amount
Be careful not to touch your fingers or the lubrication amount
Use the following procedure to check the amount of oil being supplied to the rotary hook when replacing the rotary hook or
when changing the sewing speed.
<Checking the lubrication amount>
1. Remove the thread from all points from the thread take-up
to the needle.
2. Use the lifting lever to lift the presser foot.
3. Run the machine at the normal sewing speed for
approximately 1 minute without sewing any material
(following the same start/stop pattern as when actually
sewing).
4. Place the lubrication amount check sheet (1) underneath
the rotary hook (2) and hold it there. Then run the sewing
machine at the normal sewing speed for 8 seconds. (Any
type of paper can be used as the lubrication amount
check sheet (1).)
5. Check the amount of oil which has spattered onto the
sheet.
If adjustment is necessary, carry out the following operations
in “Adjusting the lubrication amount”.
<Adjusting the lubrication amount>
1. Tilt back the machine head.
2. Turn the adjusting screw (3) to adjust the lubrication
amount.
・ If the rotary hook adjusting screw (3) is turned
clockwise, the lubrication amount becomes greater.
・ If the rotary hook adjusting screw (3) is turned
counterclockwise, the lubrication amount becomes
smaller.
3. Check the lubrication amount again according to the
procedure given in “Checking the lubrication amount”
above.
NOTE:
Turn the adjusting screw (3) and check the lubrication
amount repeatedly until the lubrication amount is
correct.
4. Check the lubrication amount again after the sewing
machine has been used for approximately two hours.
S-7100A
Page 44
8. TROUBLESHOOTING
34
CAUTION
Is the upper thread tension too weak, or is the lower thread tension
Is the lower thread tension too weak, or is the upper thread tension
Use a file with a fine grain or sandpaper to polish smooth the
Adjust the clearance between the needle and the tip of the
0573M
0574M
0977M
0470M
8. TROUBLESHOOTING
・ Please check the following points before calling for repairs or service.
・ If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of
purchase.
Turn off the power switch and disconnect the power cord before carrying out troubleshooting.
The machine may operate if the treadle is depressed by mistake, which could result in injury.
8-1. Sewing
Items with a “*” in the “Page” column should only be checked by a qualified technician.
Problem Possible cause Page
1 Upper thread is not tight.
・
too strong?
Adjust the upper thread tension or lower thread tension.
・ Is the needle and feed timing correct?
Advance the needle timing.
31*
2 Lower thread is not tight.
3 Loops appear in seam.
4 Skipped stitches occur
while sewing
・
too strong?
Adjust the lower thread tension or upper thread tension.
・ Is the thread path not smooth enough?
thread path.
・ Is the bobbin not turning smoothly?
Pull out the lower thread to check that there is no slackness in
the thread tension, or replace the bobbin or bobbin case.
・ Is the needle tip bent? Is the needle tip blunt?
If the needle tip is bent or broken, replace the needle.
・ Is the needle properly installed?
If it is incorrect, install the needle correctly.
・ Is the machine properly threaded?
If it is incorrect, thread the thread correctly.
・ Is the presser foot pressure too weak?
Adjust the presser foot pressure.
・ Is the needle too thin?
Replace the needle with a needle that is one rank thicker.
・ Is the presser foot too high?
Adjust the height of the presser foot.
・ Is the thread take-up spring too weak?
Adjust the tension of the thread take-up spring.
・ Is the needle and rotary hook timing correct?
Adjust the height of the needle bar.
rotary hook.
26
29*
*
31*
32*
S-7100A
Page 45
8. TROUBLESHOOTING
35
r threads too short after thread
Sharpen the fixed knives, or replace the fixed and movable
e lower than the
Is the length of thread trailing out from the bobbin case after thread
to as low a
Gradually reduce the maximum sewing speed using the
0749M
0473M
0978M
Problem Possible cause Page
5 Skipped stitches at sewing
start
Thread unravelling at
sewing start
・ Is the thread take-up spring tension too strong?
Reduce the tension of the thread take-up spring.
・ Is the thread take-up spring operating range too large?
Lower the position of the thread take-up spring.
・ Are the trailing lengths of the uppe
trimming?
Adjust the pretension.
・ Are the threads not being trimmed cleanly?
knives if necessary.
・ Is the needle too thick?
Try using a needle with a count that is on
current needle.
・
trimming too short?
If the bobbin is spinning loosely, replace the anti-spin spring in
the bobbin case.
・ Is the sewing speed too fast at the sewing start?
Set the operation panel so that slow start is enabled.
・ Is the needle up stop position too high?
Adjust the needle up stop position.
*
*
27*
21*
24*
6 Uneven seam
・ Is the presser foot pressure too weak?
Adjust the presser foot pressure.
・ Is the feed dog too low?
Adjust the feed dog height.
・ Is the bobbin scratched?
If the bobbin is damaged, smooth it with an oiled grindstone or
replace it.
7 Large degree of puckering
(excess tension)
・ Is the upper thread tension too strong?
Make the upper thread tension as weak as possible.
・ Is the lower thread tension too strong?
Make the lower thread tension as weak as possible.
・ Is the needle tip blunt?
Replace the needle if it is blunt.
・ Is the needle too thick?
Replace with as thin a needle as possible.
・ Are the thread take-up spring tensions too strong?
Make the thread take-up spring tension as weak as possible.
・ Is the thread take-up spring operating range too large?
Lower the position of the thread take-up spring
position as possible.
・ Is the presser foot pressure too strong?
Adjust the presser foot pressure.
・ Is the sewing speed too fast?
operation panel.
・ Is the angle of the feed dog correct?
Tilt the front of the feed dog down slightly.
30*
*
*
*
16*
30*
S-7100A
Page 46
8. TROUBLESHOOTING
36
Lower thread is tangled at
Spinning of bobbin during
Is the bobbin spinning direction correct when the lower thread is
Set the bobbin so that it turns in the opposite direction to the
Upper and lower threads
If the thread path is damaged, smooth it with sandpaper or
0471M
Lower
0751M
2124M
0750M
Problem Possible cause Page
8 Material slippage
・ Is the presser foot pressure too strong?
Adjust the presser foot pressure.
9
the sewing start.
thread trimming
10
are breaking.
thread
・
being pulled?
rotary hook.
・ Is there too much thread
wound onto the bobbin?
The bobbin winding
amount should not be
more than 80 %.
・ Is the anti-spin spring attached?
Attach the anti-spin spring.
・ Is the bobbin turning smoothly?
If the bobbin is not turning smoothly, replace the bobbin.
・ Is a bobbin other that the light-alloy bobbins specified by Brother
being used?
Use only bobbins which are specified by Brother.
・ Is the needle bent or is the needle tip broken?
Replace the needle if it is bent or broken.
・ Is the needle properly installed?
If it is incorrect, install the needle correctly.
・ Is the machine properly threaded?
If it is incorrect, thread the thread correctly.
・ Is the upper or lower thread tension too weak or too strong?
Adjust the upper thread or lower thread tension.
・ Is the upper thread may be loose because the thread take-up spring
operating range is too small?
Adjust the position of the thread take-up spring.
・ Is the rotary hook, feed dog or other part damaged?
If they are damaged, smooth them with an oiled grindstone or
replace the damaged parts.
・ Is the thread path damaged?
replace the damaged part.
26
26*
*
*
11 Incorrect thread trimming
(Upper and lower threads
are both not being
trimmed)
12 Incorrect thread trimming
(Upper thread or lower
thread is not being
trimmed)
・ Is the fixed knife or movable knife damaged or worn?
Replace the fixed knife or the movable knife.
・ Is the needle properly installed?
If it is incorrect, install the needle correctly.
・ Is the fixed knife or movable knife blunt?
Replace the fixed knife or the movable knife.
27*
27*
S-7100A
Page 47
8. TROUBLESHOOTING
37
pulled with excessive force during
Is the needle bent, is the needle tip broken, or is the needle hole
Adjust the clearance between the needle and the tip of the
Machine does not operate
when power is turned on
Is the sewing speed setting or backtack stitch speed setting too
Set the maximum sewing speed to a higher speed.
16*
Nothing appears on the
Insert the connector securely.
Caution
0469M
Problem Possible cause Page
13 Broken needles
・ Is the material being pushed or
sewing?
・ Is the needle properly installed?
If it is incorrect, install the needle correctly.
・
blocked?
Replace the needle.
・ Is the needle and rotary hook timing correct?
Adjust the height of the needle bar.
rotary hook.
・ Is the needle timing too advanced with respect to the feed dog?
Retard the needle timing.
・ It is extremely dangerous to leave any pieces of broken
needle sticking in the material. If the needle breaks, search
for all pieces until the whole of the needle is found again.
・ Furthermore, we recommend that through steps be taken to
account for such needles to comply with product liability
regulations.
31*
32*
31*
14
and treadle is pressed.
15 Machine does not operate
at high speed.
16
operation panel display.
・ Is the power supply connector disconnected from the control box?
Insert the connector securely.
・
slow?
・ Is the power supply connector disconnected from the control box?
Insert the connector securely.
・ Is the operation panel connector at the control box disconnected?
7～11
7～11
7*
S-7100A
Page 48
8. TROUBLESHOOTING
38
Error code
Possible cause
Page
E050
The machine head was detected as being tilted back when the treadle was
Turn off the power switch and then return the machine head to the upright
machine head to carry out any tasks, turn off the power switch
Is the 8-pin operation panel connector disconnected?
E051
The machine head was detected as being tilted back during sewing.
E055
Was the power switch turned on while the machine head was still tilted back?
Turn off the power switch and then return the machine head to the upright
E065
Was the power switch turned on while an invalid key was being pressed on the
power switch and check that no operation panel keys are being
E066
Was the actuator switch being pressed when the power switch was turned on?
0539D
12-pin solenoid
connector
10-pin resolver
connector
3-pin power supply
connector
4-pin motor
connector
8-pin operation panel
0538D
8-2. Error code displays
If an error code appears on the operation panel display
1. Make a note of the error code and then turn off the power.
2. After the operation panel display has turned off, eliminate the cause of the error and
then turn the power back on.
・ Items with a “ * ” in the “Page” column should only be checked by a qualified technician.
・ For items with “ ** ” appearing in the “Page” column, ask the place of purchase for
advice.
<Connector layout diagram>
connector
・
depressed.
position.
(If tilting back the
first.)
・
Turn the power off and then back on again.
Is the 8-pin operation panel connector disconnected?
・
position.
・ Is the 8-pin operation panel connector at the control box disconnected?
Turn off the power switch, and then check the connection of the 8-pin operation
panel connector.
・
operation panel?
Turn off the
pressed.
・ There is a malfunction of the operation panel.
Replace the operation panel.
・
Turn off the power switch and check that the actuator switch is not being
pressed.
・ There is a problem with the actuator switch.
Check the connection of the 12-pin solenoid connector.
Replace the actuator switch.
*
*
7*
**
7*
S-7100A
Page 49
8. TROUBLESHOOTING
39
E090
connector is not
Is the 3-pin treadle connector inside the control box disconnected?
a broken wire in the cord of the treadle connector, replace the treadle
E091
The settings in “Setting method for standard depression stroke” may be incorrect.
E095
Was the power switch turned on while the treadle was still depressed?
Return the treadle to the neutral position. When the treadle neutral position is
E111
The sewing machine could not stop correctly at the needle up stop position after
Turn off the power switch and then turn the machine pulley by hand and check
**
E112
The needle bar stops before the needle stop position (needle up or needle down).
Remove any thread scraps that may be stuck in the area around the rotary
connector.
E113
Stopping could not be confirmed.
This error is displayed when the machine could not be immediately stopped
Remove any thread scraps that may be stuck in the area around the rotary
hook.
E130
The sewing machine or motor do not operate when the treadle is depressed.
pin motor
Turn off the power switch and then turn the machine pulley by hand and check
E131
Is the 10-pin resolver connector at the control box disconnected?
E132
Problem with motor.
E140
Motor reverse operation was detected.
Error code Possible cause Page
・
Treadle
・ Problem with treadle unit.
connected.
・
・ Problem with treadle unit.
Turn off the power switch, and then check that the 3-pin treadle connector is
connected to connector P3 on the main PCB.
If there is
unit.
Redo the settings in “Setting method for standard depression stroke”.
Replace the treadle unit.
*
**
*
**
・
detected, the error will be cleared and normal operation will then be possible.
・ Is the power supply voltage too low?
Check the power supply voltage.
・
thread trimming.
Remove any thread scraps that may be blocking the motor.
that it turns easily.
Check that there are no problems with the thread trimming mechanism.
・
Turn the pulley by hand and check that it does not turn stiffly.
hook.
・ Abnormal needle up signal
Turn off the power switch, and then check the connection of the 10-pin resolver
・
because of an abnormal load causing the machine speed to increase during a
stopping operation.
Turn the pulley by hand and check that it does not turn stiffly.
*
*
*
・ Is the 4-pin motor connector of the control box disconnected?
・ Has the sewing machine locked up?
・ Problem with control box.
・
Problem with
motor encoder
signal.
Problem with
motor operation.
Motor reverse
operation.
・ Problem with motor or main PCB.
・
・ Problem with main P.C. board
・
Turn off the power switch and check the connection of the 4connector.
that it turns easily.
Replace the control box.
Turn off the power switch, and then check the connection of the 10-pin resolver
connector.
Replace the motor or the control box.
Replace the motor.
Replace the control box.
Replace the motor.
S-7100A
7*
*
**
7*
**
**
**
**
Page 50
8. TROUBLESHOOTING
40
E150
This is displayed when the motor becomes abnormally hot and the temperature
turn on the power switch and operate the
E151
The connection of the 10-pin resolver connector at the control box is faulty.
E161
Motor overload
This is displayed when a motor overload operation has occurred.
by hand and check that it
E190
This appears on the display when the sewing machine has been operating
again, and then operate the sewing
E191
Thread trimming
This is displayed if the sewing machine motor locks during thread trimming.
E410
panel.
Is the 8-pin operation panel connector at the control box disconnected?
E440
Problem with main PCB.
E441
Problem with main PCB.
E442
on main PCB.
The data on the main PCB is corrupted. Corrupt data was initalized.
E451
Error writing data
to head detector
unit.
Data could not be correctly written to the panel when adjusting the needle up stop
Error code Possible cause Page
・
Motor is
overheating.
Problem with
motor
overheating
sensor.
protection has activated.
After the temperature has dropped,
sewing machine as normal.
・
Turn off the power switch, and then check the connection of the 10-pin resolver
connector.
・ Problem with motor or main PCB.
Replace the motor or the control box.
**
protection
Motor timeout.
solenoid timeout.
Error
communicating
with operation
Error writing data
to main PCB.
Error reading data
from main PCB.
Problem with data
・
Turn off the power switch, and then turn the pulley
turns easily.
・ Problem with motor.
Replace the motor.
・
continuously for 3 minutes or more.
Turn the power switch off and then back on
machine normally.
・
Remove any thread scraps that may be blocking the motor.
Check that there are no problems with the thread trimming mechanism.
・
Turn off the power switch, and then check the connection of the 8-pin operation
panel connector.
・
Replace the control box.
・
Replace the control box.
・
Turn the power off and then back on again.
*
**
7*
**
**
・
position.
Repeat the write operation.
・ Alternatively, turn the power off and then back on again to reset the machine.
S-7100A
Page 51
8. TROUBLESHOOTING
41
E701
Does the power supply voltage match the control box voltage specifications?
Replace the control box.
E705
Is the power supply voltage abnormally low?
Replace the control box.
E710
Is the electrical equipment connector inside the control box disconnected?
Turn off the power switch and then turn the machine pulley by hand and check
This is displayed if the machine pulley moves stiffly when it is turned by hand, or if
Turn off the power switch and then turn the machine pulley by hand and check
This is displayed if there is some problem with the motor and an abnormal current is
E790
Problem with
solenoid power
This is displayed when there is no power for solenoid, or if the power level is
E791
This is displayed when there is overcurrent in any of the solenoids (thread trimming,
NOTE:
Error code Possible cause Page
・
Abnormally high
power supply
voltage.
・ Is the power supply voltage abnormally high?
・ Problem with control box.
Check that the voltage matches.
Check the connection of the 5-pin transformer connector inside the control box.
(220 V AC: P12, 230 V AC: P13)
Check the power supply voltage.
*
*
**
Abnormally low
power supply
voltage.
Motor
overcurrent.
supply
・
Check the power supply voltage.
Check the connection of the 5-pin transformer connector inside the control box.
(220 V AC: P12, 230 V AC: P13)
・ Problem with control box.
・
that it turns easily.
・
the sewing machine locks up and an abnormal current is flowing.
that it turns easily.
・
flowing.
Replace the motor.
・ Problem with control box.
Replace the control box.
When the power supply voltage is abnormally low, E710 may be displayed
instead of E705.
・
abnormally low.
Check the connection of the 2-pin transformer connector inside the control box.
・ Problem with main P.C. board or transformer.
Replace the control box.
*
**
*
*
**
**
*
**
・
Solenoid
overcurrent.
thread wiping, quick reverse or presser lifter).
Check the resistances of the solenoids.
・ Problem with main PCB.
Replace the control box.
If an error code that is not listed above appears or if carrying out the specified remedy does not solve
the problem, contact the place of purchase.
S-7100A
*
**
Page 52
9. 7-SEGMENT DISPLAY
42
9. 7-SEGMENT DISPLAY
4268M
S-7100A
Page 53
S-7100A
001
2015.04.D(1)
* Please note that the contents of this manual may differ slightly from the actual product purchased as a result of product improvements.
© 201
This is the original instructions.
http://www.brother.com/
1
INSTRUCTION MANUAL
-5, Kitajizoyama, Noda-cho, Kariya 448-0803, Japan.
5 Brother Industries, Ltd. All Rights Reserved.
SB6643-
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