Brother S-7300A-333P Instruction Manual
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Brother S-7300A-333P Instruction Manual

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

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Summary of Contents for Brother S-7300A-333P

  • Page 1 S-7300A INSTRUCTION MANUAL Please read this manual before using the machine. Please keep this manual within easy reach for quick reference. SINGLE NEEDLE DIRECT DRIVE LOCK STITCHER WITH ELECTRONIC FEEDING SYSTEM AND THREAD TRIMMER...
  • Page 2 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.

  • Page 3: Safety Instructions

    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.
  • Page 4 Contact your Brother dealer or a qualified electrician for any electrical work that may need to Secure the table so that it will not move when tilting be done.
  • Page 5  the machine unattended If the machine develops a problem, contact your nearest Brother dealer or a qualified technician. If using a work table which has casters, the casters should be secured in such a way so that they Do not hold the machine head by the panel when cannot move.

  • Page 6: Maintenance And Inspection

    If only one hand is used, the weight of the machine Ask your Brother dealer or a qualified electrician to head may cause your hand to slip, and your hand carry out any maintenance and inspection of the may get caught.
  • Page 7 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. Touching areas where high voltages are present can Be careful not to get your hands result in severe injury.
  • Page 8 Transformer box (100 V/400 V system only) Oil tank Control box 0874D S-7300A...
  • Page 9 S-7300A...

  • Page 10: Table Of Contents

    CONTENTS 1. MACHINE SPECIFICATIONS ....1 6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) ....2. NAMES OF MAJOR PARTS ....6-1. Adding and deleting steps ....... 41 3. INSTALLATION ........6-2. Editing steps............ 42 3-1. Table processing diagram ........ 4 6-3.

  • Page 11: Troubleshooting

    12-5. Adjusting the feed dog height ....... 76 12-6. Adjusting the feed dog angle ......77 12-7. Adjusting the needle bar height ....78 12-8. Adjusting the needle and feed mechanism timing ........79 12-9. Needle and rotary hook timing ..... 80 12-10.

  • Page 12: Machine Specifications

    0.8mm 1.2mm Needle (DB×1, DP×5) #11 - #18 #19 - #22 Motor AC servo motor Control circuit Microprocessor Rotary hook New lubrication-type rotary hook Lubricating oil -[]0[]P -[]3[]P Rotary hook High-speed spindle High-speed spindle Needle bar Special Brother grease S-7300A...

  • Page 13: Names Of Major Parts

    2. NAMES OF MAJOR PARTS 2. NAMES OF MAJOR PARTS 0876D (1) Bobbin winder (2) Thread wiper device (3) Lifting lever (4) Hand switch A (5) Hand switch B (6) Work clamp (7) Knee lifter plate (8) Power switch (9) Oil gauge window (10) Oil feeding pocket (11) Machine pulley (12) Operation panel...

  • Page 14: Installation

    If the table moves, it may crush your feet or cause other injuries. Contact your Brother dealer or a qualified electrician for any electrical work that may need to be done. Use both hands to hold the machine head when tilting it back or returning it to its original position.

  • Page 15: Installation

    3. INSTALLATION 3-1. Table processing diagram ・ The top of the table should be 40 mm in thickness and should be strong enough to hold the weight and with-stand the vibration of the sewing machine. ・ Drill holes as indicated in the illustration below. Cotton stand hole Head rest hole Cord hole...

  • Page 16: Machine Head

    3. INSTALLATION 3. Rubber cushions (1) Rubber cushions [2 pcs] 0882D 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.
  • Page 17 3. INSTALLATION 6. Knee lifter plate <Knee lifter adjustment> 1. Turn the machine pulley so that the feed dog is below the top of the needle plate. 2. Lower the presser foot (1) by using the lifting lever (2). 0884D 3.

  • Page 18: Lubrication

    3. INSTALLATION 3-3. Lubrication CAUTION Do not connect the power cord until lubrication has been completed, otherwise the machine may operate if the treadle is depressed by mistake, which could result in injury. Be sure to wear protective goggles and gloves when handling the lubricating oil and grease, so that they do not get into your eyes or onto your skin, otherwise inflammation can result.

  • Page 19: Connecting The Cords

    3. INSTALLATION 3-4. Connecting the cords CAUTION Contact your Brother dealer or a qualified electrician When securing the cords, do not bend the cords for any electrical work that may need to be done. excessively or fasten them too hard with staples,...
  • Page 20 3. INSTALLATION 3. Lower the harness cover (1), and then place the harness inside the harness cover. 0928D 3. Cords (2) 0889D (1) 4-pin machine motor connector (2) Feed motor connector 6-pin (3) 3-pin power connector Lower the tab (4). Align the flat edges Push in securely until the tabs (4) engage.

  • Page 21: Other Cords

    3. INSTALLATION 3-4-2. Other cords DANGER Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before opening the cover of the control box. Touching areas where high voltages are present can result in severe injury.
  • Page 22 3. INSTALLATION <For 100V/400V system specifications> (1) Power switch (2) Screws [2 pcs] 4145M S-7300A...
  • Page 23 3. INSTALLATION (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.
  • Page 24 3. INSTALLATION <For Americas 220V specifications> (1) Power switch (2) Screws [2 pcs] Operator 4145M (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.

  • Page 25: Turning On The Power

    3. INSTALLATION 3-5. Test operation (Operating the treadle) CAUTION Do not touch any of the moving parts or press any objects against the machine while sewing, as this may result in personal injury or damage to the machine. 1. Turning on the power Press the ON power switch (1).

  • Page 26: Adjusting The Treadle

    3. INSTALLATION 2. Test operation 3648M Check that the machine sews at low speed when the treadle (1) is gently pressed to position (B). Then check that it sews at high speed when the treadle (1) is gently pressed to position (C). After pressing treadle...

  • Page 27: Preparation Before Sewing

    * There is an anti-spin spring (3) inside the bobbin case. The anti-spin spring (3) prevents the bobbin from racing at times such as during thread trimming. * Use bobbins (2) made of light alloy as specified by BROTHER. 2120M For thick materials 0798M...

  • Page 28: Winding The Lower Thread

    4. PREPARATION BEFORE SEWING 4-3. Winding the lower thread CAUTION Do not touch any of the moving parts or press any objects against the machine while winding the lower thread, as this may result in personal injury or damage to the machine. 1.

  • Page 29: Threading The Upper Thread

    4. PREPARATION BEFORE SEWING 4-5. Threading the upper thread CAUTION Turn off the power switch before threading the upper thread. The machine may operate if the treadle is depressed by mistake, which could result in injury. Turn the machine pulley and raise the thread take-up (1) before threading the upper thread. This will make threading easier and it will prevent the thread from coming out at the sewing start.

  • Page 30: Using The Knee Lifter

    4. PREPARATION BEFORE SEWING 4-6. Using the knee lifter The presser foot (2) can be raised by pressing the knee lifter plate (1). 0899D S-7300A...

  • Page 31: Using The Operation Panel

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-1. Names and functions (1) Menu key This key is used to move to the menu screen. (2) Home key This key is used to return to the home screen. (3) Half stitch key When the sewing machine is stopped, the needle bar can be moved up and down by pressing this key.

  • Page 32: Description Of Detailed Home Screen

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-2-1. Description of detailed home screen Program No. Main stitch pitch (16) Main sewing speed Target counter Production counter (17) (10) (11) (12) (18) (13) (14) (15) Screen lock key Press this key to switch the home screen between locked and unlocked. NOTE: At the time of shipment from the factory, the screen is set to lock automatically Screen unlock key...

  • Page 33: Description Of Simple Home Screen

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-2-2. Description of simple home screen Program No. Lower thread counter Main sewing speed Main stitch pitch Target counter Production counter (10) (11) Screen lock key Press this key to switch the home screen between locked and unlocked. NOTE: At the time of shipment from the factory, the screen is set to lock automatically Screen unlock key...

  • Page 34: Types Of Icons

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-2-3. Types of icons The icons which appear in the display can be broadly classified into the following three types. Type A: Simple symbols <Example> Warning symbol USB connector Current program No. Type B: Plain touch keys (symbol is always fixed) <Example>...

  • Page 35: Menu Screen

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-3. Menu screen ・ Press the key at any screen to return to the home screen. ・ The menu screen consists of the following five screens. ・ Press the key at a menu screen to change the screen. 1st page 2nd page 3rd page...

  • Page 36: Program Setting Method

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-4. Program setting method ・ It is recommended that you register patterns that are sewn frequently as programs. After programs have been registered, you can retrieve the desired sewing patterns simply by selecting a program number, which eliminates the need to set the pattern each time.
  • Page 37 5. USING THE OPERATION PANEL (BASIC OPERATIONS) Start backtack sewing parameters Setting value Start backtack sewing pattern 220 - 3000 sti/min Sewing speed No. of stitches A 1 - 19 stitches No. of stitches B 1 - 19 stitches -3 specifications: 0.05 - 5.00 mm Stitch pitch -5 specifications: 0.05 - 5.00 mm Main sewing parameters...
  • Page 38 5. USING THE OPERATION PANEL (BASIC OPERATIONS) (4) Program individual functions Setting value Needle stops in the down position. Needle up/down Needle stops in the up position. Thread trimming operation is carried out when the treadle is depressed backward. Thread trimming lock Thread trimming operation by depressing the treadle backward is locked (disabled).

  • Page 39: Start Backtack Settings

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-4-2. Start backtack settings Switching to start backtack setting mode For the detailed home screen If you keep pressing the start backtack key, the display switches to the start backtack setting screen. For the simple home screen If you keep pressing the start backtack key, the display switches to the start backtack setting screen.

  • Page 40: Main Sewing Settings

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-4-3. Main sewing settings Switching to main sewing setting mode For the detailed home screen If you keep pressing the main sewing key, stitch pitch key or sewing speed key, the screen will switch to main sewing setting mode. For the simple home screen If you keep pressing the stitch pitch key or sewing speed key, the screen will switch to main sewing setting mode.

  • Page 41: End Backtack Settings

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-4-4. End backtack settings Switching to end backtack setting mode For the detailed home screen If you keep pressing the end backtack key, the display switches to the end backtack setting screen. For the simple home screen If you keep pressing the end backtack key, the display switches to the end backtack setting screen.

  • Page 42: Using Program Individual Functions And Program Common Functions

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-5. Using program individual functions and program common functions ・ In addition to start backtack sewing, main sewing and end backtack sewing, the following 9 types of functions are also included in the parameters which are necessary for sewing. Needle up/down, thread trimming lock, thread wiping, correction sewing, AUTO, slow start, special locus, best PFM mode, auto X-over seam assist mode.

  • Page 43: Needle Up/Down

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-5-1. Needle up/down This sets whether the needle bar stops in the up position or the down position when the treadle is returned to the neutral position and sewing stops. Setting details Needle stops in the down position. However, the needle will stop in the up position when the treadle is depressed backward, and after thread trimming (needle raised) during automatic sewing.

  • Page 44: Correction Sewing

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-5-4. Correction sewing Correction sewing operation can be set. Setting details Correction sewing operation using the hand switch is disabled. NOTE: Operating the hand switch may result in an operation other than correction sewing being carried out. * The operation mode can be changed to a different mode from correction sewing.

  • Page 45: Slow Start

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-5-6. Slow start The slow start pattern at the sewing start after thread trimming can be set. Setting details Sewing is carried out without slow start operation. Sewing is carried out according to slow start pattern 1. 1st stitch: 400sti/min 2nd stitch: 400sti/min 3rd stitch: 400sti/min...

  • Page 46: Best Pfm Mode

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-5-8. Best PFM mode The treadle can be set to turn the functions for preventing the thread from pulling out ("Prev. thread away" function) and the function for preventing short thread trailing lengths ("T/T short" function) on and off. (The "Prev.

  • Page 47: Using The Production Counter

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-6. Using the production counter ・ The production counter can be used to let you know how many items have been sewn. ・ The production counter increases by 1 each time thread trimming is carried out. Switching to production counter editing mode For the detailed home screen Set the counter display so that it is displaying the production counter icon, and...

  • Page 48: Using The Lower Thread Counter

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-7. Using the lower thread counter ・ The lower thread counter can be used to let you know approximately how much lower thread is remaining. * The lower thread counter should be used as a guide only. ・...
  • Page 49 5. USING THE OPERATION PANEL (BASIC OPERATIONS) <Lower thread counter operation> When sewing is carried out, the value shown in the lower thread counter display is reduced by 0.1 each time the number of stitches x sewing pitch reaches 0.1 m. However, the display is only updated when the treadle is returned to the neutral position.

  • Page 50: Home Screen Mode Setting

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-8. Home screen mode setting ・ You can select from two different types of home screen display: the detailed home screen or the simple home screen. * When the home screen is displayed, you can keep pressing the key to switch between home screens.

  • Page 51: Illumination Led Brightness Setting

    5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-9. Illumination LED brightness setting The brightness of the illumination LED can be set. Switching to illumination LED brightness setting mode For the detailed home screen Keep pressing the "LED brightness" key to switch to illumination LED brightness setting mode.

  • Page 52: Using The Operation Panel (Advanced Operations)

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-1. Adding and deleting steps S-05 You can put together programs, such as the one shown in the illustration at right for pocket sewing, by registering multiple S-01 S-04 steps in the main sewing section.

  • Page 53: Editing Steps

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-2. Editing steps The number of stitches and sewing pitch can be changed separately for each step. Switching to main sewing setting mode From the detailed home screen ・ Press the key to select the step number to be edited. ・...

  • Page 54: Sewing Start Step Setting

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-3. Sewing start step setting If sewing is interrupted by a problem such as a thread breakage occurring and you need to resume sewing from the point where sewing was interrupted, you can start sewing from the middle of a step. Switching to sewing start step setting mode 1.

  • Page 55: Program Copy

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-4. Program copy To create a program with parameters that are almost exactly the same as those of another program, you can copy the original program and change just the parts which need to be changed. Switching to program copy mode 1.

  • Page 56: Shortcut Key Assignment Method

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-5. Shortcut key assignment method You can assign functions to the 4 shortcut keys which are displayed on the simple home screen. Initially, the start backtack key, end backtack key, slow start key and thread trimming lock key are assigned. At the menu screen, select "Short cut key setting"...

  • Page 57: Design Stitch Registration Method

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-6. Design stitch registration method Up to 5 different types of design stitches (DS-1 to DS-5), each one consisting of several different pitch groups (up to a maximum of 8 groups), can be registered. A single group can be set to contain up to a maximum of 20 stitches with the same stitch pitch.
  • Page 58 6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) <Design stitch registration (content setting) screen> The design stitch number (1) to be registered will be displayed. 1. Press the key to change the group number (1). 2. Press the + or - key to set the stitch pitch (2) for group 1 to 1.00 mm. The stitch pitch can be set to between 0.05 mm and 5.00mm.

  • Page 59: Working Pace Setting Method

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-7. Working pace setting method ・ The target counter can be used to let you know the state of work progress. ・ The target counter increases by 1 each time the time set as the working pace has elapsed. However, counting is not carried out during the period from when the power is turned on until sewing starts.

  • Page 60: Memory Switch Setting Method (Standard)

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-8. Memory switch setting method (Standard) ・ The settings for the memory switches are valid for all programs. <Switching to memory switch setting mode (Standard)> At the menu screen, select "Memory switch setting" to switch to memory switch setting mode.

  • Page 61: List Of Memory Switch Settings

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-9. List of memory switch settings Presser foot lifter and treadle settings (001 to 099) Initial Setting Setting range Setting details value units ON/OFF (*1) When treadle is returned to neutral after thread trimming, presser foot is －...
  • Page 62 6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) Sewing machine motor settings (100 to 199) Setting Setting range Initial value Setting details units OFF, 1 - 3 Slow control after sewing start OFF: Disabled 1: Only at the sewing start after thread trimming 2: Only when sewing is restarted 3: Usual operation 1 - 5...
  • Page 63 6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) Panel operation settings (300 to 399) Initial Setting Setting range Setting details value units 1 - 2 Movement when bobbin counter warning. 1: Sewing can continue by pressing the return key 2: Sewing is only possible when lower thread counter is reset after replacing the bobbin.
  • Page 64 6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) Sewing program settings (400 to 499) Initial Setting Setting range Setting details value units ON/OFF Stopping during start backtacking and sewing speed － ON: When the treadle is returned to the neutral position, start backtacking can be stopped before it is finished, and the speed during start backtacking becomes the speed corresponding to the treadle depression amount (low speed - start backtacking speed)

  • Page 65: Hand Switches

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-10. Hand switches There are two types of hand switch: Type A and type B. The following functions can be assigned to each one. * However, they cannot both be pressed at the same time. (The one which was pressed first will be activated.) The input for hand switch A is in 8 steps, and the input for hand switch B is in 3 steps (off, half-pressed and fully-pressed).
  • Page 66 6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) Hand switch A (initial value: 4) Hand switch B (initial value: 1) OFF: <Disabled> OFF: <Disabled> 1: <Variable pitch (reverse is available)> 1: <Reverse> Sewing pitch changes from main pitch to reverse Feed moves in reverse while the switch is being main pitch depending on how far the switch is pressed.

  • Page 67: Hand Switch Function Setting

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-10-1. Hand switch function setting <Switching to hand switch setting mode> At the menu screen, select "Hand switch setting" to switch to hand switch setting mode. Select the desired menu. For example, to set hand switch A so that it operates as a correction sewing switch: 1.

  • Page 68: 2Nd Correction Pitch Setting

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-10-2. 2nd correction pitch setting Normally, correction sewing is carried out at the currently-set sewing pitch. However, when "Correction sewing at 2nd correction pitch" is set for carrying out correction sewing, then correction sewing is carried out at the pitch which is set below. <Switching to correction 2nd pitch ratio screen>...

  • Page 69: Reading And Writing Data Using Usb Media

    USB media ← (Panel) ←Sewing machine Write error log USB media ← (Panel) ←Sewing machine Creating folders for USB media Data type Filename Folder name ¥BROTHER¥ISM¥ISMDF**¥ (** is the value for MSW-750) Program ISMUPG.SEW (Refer to the Service Manual for details on MSW-750.) Memory switches ISMMSW.SEW...

  • Page 70: Resetting All Settings To Their Defaults

    6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-12. 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 stored data.

  • Page 71: Sewing

    7. SEWING 7. SEWING CAUTION Attach all safety devices before using the sewing machine. If the machine is used without these devices attached, injury may result. Turn off the power switch at the following times. The machine may operate if the treadle is depressed by mistake, which could result in injury. ...

  • Page 72: Backtacking

    7. SEWING Screens where sewing is possible If the treadle is depressed while any of the following screens are displayed, the sewing machine will operate. Be careful not to depress the treadle by mistake. 7-3. Backtacking When hand switch B (1) is pressed during sewing, the feed direction will be reversed.

  • Page 73: Sewing Condensed Stitches

    7. SEWING 7-4. Sewing condensed stitches If you press hand switch A (1) while sewing is in progress, ・ you can sew stitches (forward direction) with small stitch lengths. The stitch pitch can be changed to between the main ・ stitch pitch and the main reverse stitch pitch depending on how far it is pushed in.

  • Page 74: New Functions

    8. NEW FUNCTIONS 8. NEW FUNCTIONS 8-1. Best PFM mode (short trailing length/bird's nest reduction mode) This mode reduces the occurrence of bird's nests at the sewing start, and shortens the length of thread trailing out from the material at the sewing end. <Setting method>...

  • Page 75: Using X-Over Seam Assist Mode

    8. NEW FUNCTIONS 8-2. Using X-over seam assist mode The X-over seam sensor reduces the occurrence of tangled threads and broken needles during X-over seam sewing. <Setting method> 1. Set the thickness of the X-over seam area. 1-1. Keep pressing the X-over seam assist mode key (1), then select "X-over...

  • Page 76: Using The Feed Dog Locus

    No. 2 Feed direction Responsiveness to heavy-weight materials is improved compared to previous -3 specifications. [-[][]3 specifications only] 1. Use a genuine Brother rotary hook (SB6568001). 2. Replace gauge parts as necessary. Recommended needle plate (SB5244001) Recommended feed dog (SB5226001) 3.

  • Page 77: Example Of Using Hand Switch Settings

    8. NEW FUNCTIONS 8-4. Example of using hand switch settings Functions can be easily assigned to the hand switches. 1. Press the menu key (1). 2. Press the “Hand switch setting” key (2). 3. Press the “Hand switch A function setting” key or the “Hand switch B function setting”...

  • Page 78: Thread Tension

    9. THREAD TENSION 9. THREAD TENSION 9-1. Adjusting the thread tension CAUTION Turn off the power switch before removing or inserting the bobbin case. The machine may operate if the treadle is depressed by mistake, which could result in injury. Good even stitches Upper thread Lower thread...

  • Page 79: Adjusting The Presser Foot Pressure

    9. THREAD TENSION 9-2. Adjusting the presser foot pressure Good even stitches Upper thread 0894M Skipped stitches occur 0895M Increase the pressure Uneven stitch length 0896M Stitches are puckered Decrease the pressure. 0897M The presser foot pressure should be as weak as possible, but strong enough so that the material does not slip.

  • Page 80: Adjusting The Thread Take-Up Amount (-[][]3 Specifications)

    9. THREAD TENSION 9-4. Adjusting the thread take-up amount (-[][]3 specifications) CAUTION Turn off the power switch before carrying out these operations. The machine may operate if the treadle is depressed by mistake, which could result in injury. NOTE: Do not use this function with models that are not -[][]3 specifications. When sewing heavy materials, the thread tension can be adjusted more easily if the thread take-up amount is set to a <Thread take-up amount>...

  • Page 81: Cleaning

    10. CLEANING 10. CLEANING CAUTION Turn off the power switch before carrying out these operations. The machine may operate if the treadle is depressed by mistake, which could result in injury. Be sure to wear protective goggles and gloves when handling the grease so that it does not get into your eyes or onto your skin.
  • Page 82 10. CLEANING 2. Lubrication Oil tank oil quantity Check the oil gauge window (1), and add more oil if the oil gauge (2) is below the lower reference line. (Refer to "3-3. Lubrication".) Upper reference line Lower reference line 0907D 3.

  • Page 83: Adjusting The Rotary Hook Lubrication Amount

    11. ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT 11. ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT CAUTION Be careful not to touch your fingers or the lubrication amount 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. If care is not taken, injury may result.

  • Page 84: Standard Adjustments

    If only one hand is used, the weight of the machine Ask your Brother dealer or a qualified electrician to head may cause your hand to slip, and your hand carry out any maintenance and inspection of the may get caught.

  • Page 85: Arm Thread Guide R

    12. STANDARD ADJUSTMENTS <Thread take-up spring tension> The standard tension of the thread take-up spring (1) varies in accordance with the machine specifications as shown in the table. -[][]3 specifications 0.25 - 0.35N -[][]5 specifications 0.30 - 0.5N 1. Press the upper thread slightly above the thread tension bracket (5) with a finger to stop the thread spooling out.

  • Page 86: Presser Foot Height

    12. STANDARD ADJUSTMENTS 12-3. 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), and then turn the adjustment screw (4) so that there is no pressure applied to the presser foot.

  • Page 87: Adjusting The Feed Dog Height

    12. STANDARD ADJUSTMENTS 12-5. Adjusting the feed dog height 1. Turn on the power. 2. Start backtack sewing, best PFM mode, slow start, special locus and X-over seam assist will turn off. 3. Set the feed pitch to 3 mm (for -[][]3 specifications) or to 5 mm (for -[][]5 specifications).

  • Page 88: Adjusting The Feed Dog Angle

    12. STANDARD ADJUSTMENTS 12-6. Adjusting the feed dog angle 1. Turn on the power. 2. Start backtack sewing, best PFM mode, slow start, special locus and X-over seam assist will turn off. 3. Set the feed pitch to 3 mm (for -[][]3 specifications) or to 5 mm (for -[][]5 specifications).

  • Page 89: Adjusting The Needle Bar Height

    12. STANDARD ADJUSTMENTS 12-7. Adjusting the needle bar height Reference line (a) on the needle bar (1) should be aligned 2286M with the lower edge of the needle bar bush (2) as shown in the illustration when the needle bar (1) is at its lowest position.

  • Page 90: Adjusting The Needle And Feed Mechanism Timing

    12. STANDARD ADJUSTMENTS 12-8. Adjusting the needle and feed mechanism timing 1. Turn on the power. 2. Start backtack sewing, best PFM mode, slow start, special locus and X-over seam assist will turn off. 3. Set the feed pitch to 3 mm (for -[][]3 specifications) or to 4 mm (for -[][]5 specifications).

  • Page 91: Needle And Rotary Hook Timing

    12. STANDARD ADJUSTMENTS 12-9. Needle and rotary hook timing 2290M 2291M The rotary hook tip (3) should be aligned with the center of the needle (4) when the needle bar (1) moves up 1.8 mm (for -[][]3 specifications) or 2.2 mm (for –[][]5 specifications) from its lowest position to the position where reference line (b) is aligned with the needle bar bush (2) as shown in the 0.5 - 0.7mm...

  • Page 92: Adjusting The Presser Foot Floating Amount (Minute Lifting Amount) (Option)

    12. STANDARD ADJUSTMENTS 12-10. Adjusting the presser foot floating amount (minute lifting amount) (option) When sewing stretch materials and materials with long pile, 2307M you can make minute adjustments to the floating amount for the presser foot (1) in accordance with the material. 1.

  • Page 93: Thread Trimming

    12. STANDARD ADJUSTMENTS 12-11. Thread trimming 1. Turn off the power switch. 2. Remove the presser foot, needle plate and feed dog. 3. Tilt back the machine head. 4. Loosen the screw (2) of the thread trimmer lever (1) and the screw (4) of the upper knife lever (3).
  • Page 94 12. STANDARD ADJUSTMENTS 7. Adjust the positions of the upper and lower knife holders so that the upper knife (10) and the lower knife (6) mesh and the tips of both knives are aligned at the center of the needle. 0953D 8.
  • Page 95 12. STANDARD ADJUSTMENTS 10. Set the maximum meshing amount for the upper and lower knives to 2 mm. * Turn the thread trimmer lever (1) to align the tip of the upper knife (10) with the center of the index mark (14) on the lower knife (6).
  • Page 96 12. STANDARD ADJUSTMENTS <Thread trimming cam position adjustment> Lowest position of 1. Turn the machine pulley to raise the needle bar 6 mm Raised 6 mm needle bar from its lowest position (reference line (a) position) so that reference line (b) is aligned with the bottom edge of the needle bar bush.

  • Page 97: List Of Error Codes

    13. LIST OF ERROR CODES 13. LIST OF ERROR CODES LIST OF ERROR CODES If an error code appears on the touch panel display ・ Items with a "*" in the "Page" column should only be checked by a qualified technician. ・...
  • Page 98 13. LIST OF ERROR CODES Switch-related errors Code Cause Remedy E050 Machine head is detected as being tilted back when ・Turn off the power, and then return the machine start sewing. head to its original position. ・Turn off the power and check the connection of connector P2.
  • Page 99 13. LIST OF ERROR CODES Code Cause Remedy E190 Sewing machine motor was running continuously Turn the power off and then back on again. for too long during sewing. E191 Thread trimming solenoid operation was not Turn off power and check if the thread trimming completed within the specified period.
  • Page 100 13. LIST OF ERROR CODES P.C. board-related errors Code Cause Remedy E700 Abnormal rise in power supply voltage was Turn off the power and check the power supply detected when power was turned on. voltage. E701 Abnormal rise in sewing machine motor power ・Turn off the power and check the power supply supply voltage was detected.

  • Page 101: Troubleshooting

    14. TROUBLESHOOTING 14. TROUBLESHOOTING ・ Please check the following points before calling for repairs or service. ・ Simplified details can be checked on the panel. (Menu → Troubleshooting) ・ If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of purchase.
  • Page 102 14. TROUBLESHOOTING Problem Possible cause Page Skipped stitches at sewing ・ Is the thread take-up spring tension too strong? start Reduce the tension of the thread take-up spring. Thread unraveling ・ Is the thread take-up spring operating range too large? sewing start.
  • Page 103 ・ Is the bobbin turning smoothly? 0751M 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. S-7300A...
  • Page 104 14. TROUBLESHOOTING Problem Possible cause Page Upper and lower threads ・ Is the needle tip bent? Is the needle tip blunt? are breaking. If the needle tip is bent or blunt, replace the needle. ・ Is the needle properly installed? If it is incorrect, install the needle correctly.
  • Page 105 14. TROUBLESHOOTING Problem Possible cause Page Upper thread is raised ・ Upper thread protrudes from the material surface after thread above the material surface trimming. after thread trimming. 1. Increase the pitch during thread trimming. 2. Set the feed direction for sewing end processing to ↑. Stitch pitch and sewing speed for stitch before final stitch Stitch pitch and sewing...
  • Page 106 14. TROUBLESHOOTING Problem Possible cause Page Incorrect thread trimming ・ Is the needle properly installed? (Upper thread is not being If it is incorrect, install the needle correctly. trimmed.) ・ Is the fixed knife or movable knife blunt? (Lower thread is not being Replace the fixed knife or the movable knife.
  • Page 107 14. TROUBLESHOOTING Problem Possible cause Page Machine does not operate Is the power supply connector ・ when power is turned on disconnected from the control and treadle is pressed. box? Insert connectors securely. 12・13 Is the operation panel set to a ・...

  • Page 108: Instruction Manual

    INSTRUCTION MANUAL * Please note that the contents of this manual may differ slightly from the actual product purchased as a result of product improvements. S-7300A © 2015 Brother Industries, Ltd. All Rights Reserved. This is the original instructions. I5031041D...

This manual is also suitable for:

S-7300a-433pS-7300a-403pS-7300a-305pS-7300a-303pS-7300a-405p

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