Brother S-7100A Instruction Manual Download

Page: 46 / 53

S-7100A

8. TROUBLESHOOTING

Problem

Possible cause

Page

8 Material slippage

・

Is the presser foot pressure too strong?

Adjust the presser foot pressure.

9 Lower thread is tangled at

the sewing start.
Spinning of bobbin during

thread trimming

・

Is the bobbin spinning direction correct when the lower thread is

being pulled?

Set the bobbin so that it turns in the opposite direction to the

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.

10 Upper and lower threads

are breaking.

・

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?

If the thread path is damaged, smooth it with sandpaper or

replace the damaged part.

26*

11 Incorrect thread trimming

(Upper and lower threads

are both not being

trimmed)

・

Is the fixed knife or movable knife damaged or worn?

Replace the fixed knife or the movable knife.

27*

12 Incorrect thread trimming

(Upper thread or lower

thread is not being

trimmed)

・

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*

0471M

Lower

thread

0751M

2124M

0750M

Summary of Contents for S-7100A

Page 1: ...100A Please read this manual before using the machine Please keep this manual within easy reach for quick reference SINGLE NEEDLE DIRECT DRIVE STRAIGHT LOCK STITCHER WITH THREAD TRIMMER INSTRUCTION MANUAL ...

Page 2: ...l 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 ...

Page 3: ......

Page 4: ...hich 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...

Page 5: ...an electrical storm turn off the power and disconnect the power cord from the wall outlet Lightning may cause problems with correct operation 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 32 kg 70lb The installation...

Page 6: ... 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 a...

Page 7: ...jury 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 6 High temperature warning display 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 a...

Page 8: ...S 7100A v Control box Oil tank Transformer box 100 V 400 V system only 0591D ...

Page 9: ... 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 5 CLEANING 26 6 REPLACING THE FIXED KNIFE AND MOVABLE KNIFE 27 7 STANDARD ADJUSTMENTS 28 7 1 A...

Page 10: ...S 7100A ...

Page 11: ... 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 220 3 000 sti min End backtacking speed 1 800 sti min Max stitch length 4 2 mm 5 mm Presser foot height 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 Micropro...

Page 12: ...t caught About the machine set up location Do not set up this sewing machine near other equipment such as televisions radios or cordless telephones otherwise such equipment may be affected by electronic interference from the sewing machine The sewing machine should be plugged directly into an AC wall outlet Operation problems may result if extension cords are used Carrying the machine The sewing m...

Page 13: ...eight and with stand the vibration of the sewing machine Drill holes as indicated in the illustration below 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 0478D Control box mounting hole Cotton stand hole Head rest hole Cord hole 0592D ...

Page 14: ... 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 0479D 0480D ...

Page 15: ...w 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...

Page 16: ...ong 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 ...

Page 17: ... run a high risk of receiving a serious electric shock and problems with correct operation may also occur 2 4 1 Connecting the cords 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 2 Ground wire 1 Ground wire 2 Screw 3 Power cord 1 Attach an appropriate plug to the power cord 3 The green and ye...

Page 18: ...ews 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 ...

Page 19: ...S 7100A 2 INSTALLATION 9 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 0588D ...

Page 20: ...opriate 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 Operator 4145M Green and yellow wire ground wire 0589D ...

Page 21: ...ord 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 Green and yellow wire ground wire 4145M Op...

Page 22: ...lumns of the display The four column display shows the speed counter and stitches When the stitches are being displayed the ABCD indicator 10 will illuminate 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 When the key is pressed the setting increases from 0 up to 9...

Page 23: ...the treadle is depressed backward 8 Slow start F2 key When this key is pressed so that the indicator illuminates sewing is carried out at 700 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 9 Half stitch key When the sewing machine is stopped the needle bar can be moved up and down by pressin...

Page 24: ...nue operating until the set number of start backtack stitches has been sewn 4 End backtacking is carried out After it has finished the thread is trimmed automatically and the sewing machine stops in the needle up position NOTE If the treadle is depressed backward before sewing of the set number of start backtack stitches is complete end backtacking will not be carried out If thread trimming lock i...

Page 25: ... then the needle bar will stop in the needle up position NOTE If the treadle is returned to the neutral position while continuous backtacking is being carried out the sewing machine will stop at the point where the treadle returns to the neutral position If the treadle is depressed again operation will resume from the point where it was interrupted If thread trimming lock is set the sewing machine...

Page 26: ...h number display Sewing speed display ON Maximum sewing speed setting value ON ON Start backtack sewing speed setting value Counter display 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 m...

Page 27: ...or 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 3 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 s...

Page 28: ...ter 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 u...

Page 29: ...is pressed once the thread trimming counter display will appear The thread trimming counter will appear in the four columns of the display 3 After the thread trimming operation is complete the counter will be incremented NOTE The counter is incremented even if thread trimming is set to disabled 4 When the thread trimming counter is displayed you can press the C or D key to adjust the counter value...

Page 30: ...setting value each time the sewing machine sews 100 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...

Page 31: ...r 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 1 Activating setting mode While pressing the thread trimming disable F1 key turn on the power switch 2 Setting the needle up stop and needle down stop positions Wh...

Page 32: ...played When the C key is pressed the previous setting is displayed 3 Enabling and disabling correction sewing 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 If the SEL key 1 is pressed once more the ABCD indicator will switch off and the display will return to the setting item 4 Th...

Page 33: ...the C key is pressed the previous setting is displayed 3 Enabling and disabling thread wiping 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 4 The setting will be stored...

Page 34: ...ey 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 4 The setting will be stored and the display will return to the setting item 5 Normal sewing machine operation will then be possible For details on other adjustment i...

Page 35: ...acktack 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 Clear all 2 MEM Memory switch initialization 3 SPD Sewing speed initialization 4 SEW Program initialization 3 Press the ENTER key for 2 seconds or more Once initialization is comp...

Page 36: ...er 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 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 se...

Page 37: ... 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 li...

Page 38: ...d 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 motor cover If you touch the surface of th...

Page 39: ...essure 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 c...

Page 40: ...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 ...

Page 41: ...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 To advance the needle timing turn in the direction of A To retard the needle timing turn in the direct...

Page 42: ... 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 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 ...

Page 43: ...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 ad...

Page 44: ...hread tension or upper thread tension 3 Loops appear in seam Is the thread path not smooth enough Use a file with a fine grain or sandpaper to polish smooth the 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 4 Skipped stitches occur while sewing Is the needle tip bent Is the nee...

Page 45: ...o 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 30 7 Large degree of puckering excess tension Is the upper thread tension too strong Make the upper thread tension ...

Page 46: ...roperly 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 I...

Page 47: ... 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 Machine does not operate when power is turned on and treadle is pressed Is the power supply connector disconnected from the control box Insert the connector ...

Page 48: ...ff and then back on again Is the 8 pin operation panel connector disconnected 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 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 co...

Page 49: ...up or needle down Turn the pulley by hand and check that it does not turn stiffly Remove any thread scraps that may be stuck in the area around the rotary hook Abnormal needle up signal Turn off the power switch and then check the connection of the 10 pin resolver connector E113 Stopping could not be confirmed This error is displayed when the machine could not be immediately stopped because of an ...

Page 50: ...or more Turn the power switch off and then back on again and then operate the sewing machine normally E191 Thread trimming solenoid timeout This is displayed if the sewing machine motor locks during thread trimming Remove any thread scraps that may be blocking the motor Check that there are no problems with the thread trimming mechanism E410 Error communicating with operation panel Is the 8 pin op...

Page 51: ...e pulley moves stiffly when it is turned by hand or if the sewing machine locks up and an abnormal current is flowing Turn off the power switch and then turn the machine pulley by hand and check that it turns easily This is displayed if there is some problem with the motor and an abnormal current is flowing Replace the motor Problem with control box Replace the control box When the power supply vo...

Page 52: ...S 7100A 9 7 SEGMENT DISPLAY 42 9 7 SEGMENT DISPLAY 4268M ...

Page 53: ...the contents of this manual may differ slightly from the actual product purchased as a result of product improvements 2015 Brother Industries Ltd All Rights Reserved This is the original instructions http www brother com 1 5 Kitajizoyama Noda cho Kariya 448 0803 Japan ...

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