S-7220B INSTRUCTION MANUAL Please read this manual before using the machine. Please keep this manual within easy reach for quick reference.
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.
SAFETY INSTRUCTIONS [1] Safety indications and their meanings This instruction manual and the indications and symbols that are used on the machine itself are provided in order to ensure safe operation of this machine and to prevent accidents and injury to yourself or other people. The meanings of these indications and symbols are given below. Indications DANGER The instructions which follow this term indicate situations where failure to follow the instructions may result in death or serious injury.
[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 face plate of the control box. Touching areas where high voltages are present can result in severe injury. CAUTION Environmental requirements Use the sewing machine in an area which is free from sources of strong electrical noise such as electrical line noise or static electric noise.
CAUTION Sewing This sewing machine should only be used by operators who have received the necessary training in safe use beforehand. Attach all safety devices before using the sewing machine. If the machine is used without these devices attached, injury may result. The sewing machine should not be used for any applications other than sewing. 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.
[3] Warning labels The following warning labels appear on the sewing machine. Please follow the instructions on the labels at all times when using the machine. If the labels have been removed or are difficult to read, please contact your nearest Brother dealer. 1 2 3 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.
CONTENTS 1. NAMES OF MAJOR PARTS................ 1 2. MACHINE SPECIFICATIONS .............. 2 3. INSTALLATION.................................... 3 3-1. Table processing diagram ................................ 4 3-2. Installation ........................................................ 4 3-3. Lubrication........................................................ 8 3-4. Connecting the cords ....................................... 9 3-4-1. Opening the control box cover............. 9 3-4-2.
1. NAMES OF MAJOR PARTS 1.
2. MACHINE SPECIFICATIONS 2. MACHINE SPECIFICATIONS 4 O O Quick reverse Thread wiper Lubrication type Use Max. sewing speed Start backtacking and continuous backtacking speed End backtacking speed Max. stitch length Lifting lever Presser foot height Knee lifter Feed dog height Needle (DB×1, DP×5) Motor Control circuit 0 Minimum lubrication 3 Semi dry 3 For medium-weight materials 5 For heavy-weight materials -403 5,000 rpm*1 -433 -405 4,000 rpm 4,000 rpm*2 220 - 3,000 rpm 1,800 rpm 4.5 mm 5.
3. INSTALLATION 3. INSTALLATION CAUTION Machine installation should only be carried out by a qualified technician. Contact your Brother dealer or a qualified electrician for any electrical work that may need to be done. The sewing machine weighs approximately 46 kg. 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.
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 Cord hole Head rest hole Control box mounting hole 2090M 3-2. Installation 1. Control box (1) (2) (3) (4) (5) Control box Bolts [3 pcs] Nuts [3 pcs] Spring washers [3 pcs] Washers [3 pcs] 2.
3. INSTALLATION 3. Power switch (1) Power switch (2) Screws [2 pcs] Operator 2092M 4. Oil pan (1) Head cushions (left) [2 pcs] (2) Head cushions (right) [2 pcs] (3) Oil pan 3632M 5. Rubber cushions (1) Rubber cushions [2 pcs] (2) Nails [4 pcs] 6.
3. INSTALLATION 7. Machine head (1) Hinges [2 pcs] (2) Machine head (3) Head rest NOTE: 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. 3724M 8. Operation panel (1) Rubber cushion (Remove the seal (2), and then attach the rubber cushion (1) to the panel setting plate (3).) (4) (5) (6) (7) Operation panel Washers [2 pcs.] Spring washers [2 pcs.] Screws [2 pcs.
3. INSTALLATION 10. Cotton stand (1) Cotton stand NOTE: Securely tighten the nut (4) so that the two rubber cushions (2) and the washer (3) are securely clamped and so that the cotton stand (1) does not move. 3636M 11. Knee lifter plate (1) Knee lifter plate (2) Bolt * Loosen the bolt (3) and move the knee lifter plate (1) to a position where it is easy to use. 3637M 1. Turn the machine pulley so that the feed dog is below the top of the needle plate. 2.
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.
3. INSTALLATION 3-4. Connecting the 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 face plate of the control box. Touching areas where high voltages are present can result in severe injury. CAUTION Contact your Brother dealer or a qualified electrician for any electrical work that may need to be done. Do not connect the power cord until all cords have been connected.
3. INSTALLATION (1) 7-pin head detector unit connector (2) 10-pin operating panel connector (Models with operation panel) (3) 14-pin encoder connector (4) 14-pin machine connector Refer to the following page for the 4-pin motor connector. Push in securely until the tabs (5) engage. 3131M 3132M 2. Binding the cords (1) Repeat cable tie (2) Wire clip NOTE: Bind the cords in such a way that the connector does not get pulled out.
3. INSTALLATION 2111M 3. Other cords (1) (2) (3) (4) 6-pin power supply connector 4-pin motor connector Wire clip Power cord Insert the power cord plug (5) into a wall outlet. 1. Attach an appropriate plug to the power cord (4). (The green and yellow wire is the ground wire.) 2. Insert the plug into a properly-grounded AC power supply. NOTE: Do not use extension cords, otherwise machine operation problems may result.
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. 2114M 1. Turning on the power Press the ON power switch (1). The power indicators (2) and (3) will illuminate.
4. PREPARATION BEFORE SEWING 4. PREPARATION BEFORE SEWING 4-1. Installing the needle CAUTION Turn off the power switch before installing the needle. The machine may operate if the treadle is depressed by mistake, which could result in injury. Front 1. Turn the machine pulley to move the needle bar to its highest position. 2. Loosen the screw (1). 3.
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. Turn on the power switch. 2. Place the bobbin (1) onto the bobbin winder shaft (2). 3. Wind the thread several times around the bobbin (1) in the direction indicated by the arrow. 4. Push the bobbin presser arm (3) toward the bobbin(1). 5.
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. 3737M 4-6. Adjusting the stitch length 1.
4. PREPARATION BEFORE SEWING 4-7. Using the thread wiper Press the thread wiper switch (1) to the side. If this is done, the thread wiper (2) will operate after the thread is trimmed. 2129M 2209M 3739M 4-8. Using the knee lifter The presser foot (2) can be raised by pressing the knee lifter plate (1).
5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-1. 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.
5. USING THE OPERATION PANEL (BASIC OPERATIONS) (6) Fixed stitch key When this key is pressed so that the indicator illuminates, the number of stitches (1-1999) in the E stitch number display is sewn, and then the sewing machine stops automatically. 2143M (7) Name label key When this key is pressed so that the indicator illuminates, fixed stitch sewing of the number of stitches (1-1999) in the E and F stitch number displays is carried out repeatedly.
5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-2. Sewing start and end backtack stitches 0841M 1 Setting start backtack stitches Example: 2157M 2 Setting end backtack stitches Example: 2158M 3 Start backtacking is carried out. After it has finished, normal sewing continues for as long as the treadle remains depressed. NOTE: If the treadle is returned to the neutral position, the sewing machine will continue operating until the set number of start backtack stitches has been sewn.
5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-3. Sewing continuous backtack stitches 3655M 1 Setting continuous backtack stitches Example: 3656M 2 If the treadle is simply depressed 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 bar will stop in the needle up position.
5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-4. Sewing fixed stitches 0827M 1 2161M Example: From 1 to 1999 stitches can be set. 2 After the set number of stitches in E (fixed stitches) have been sewn, the sewing machine stops in the needle position that has been set by the needle up/down key (refer to p.25). After this, normal sewing is carried out if the treadle is depressed. 2159M 3 After the thread is trimmed, fixed stitch sewing mode is enabled.
5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-5. Sewing name labels 0835M 1 2162M Example: From 1 to 1999 stitches can be set for the E and F stitch numbers. 2 After the set number of stitches in E (fixed stitches) have been sewn, the needle bar stops in the position that has been set by the needle up/down key (refer to p.25).
5. USING THE OPERATION PANEL (BASIC OPERATIONS) 5-6. Sewing pleat presser stitches 2163M 1 2164M Example: From 1 to 1999 stitches can be set. 2 If the treadle is continuously depressed and then you press the actuator while sewing is in progress, the number of backtack stitches set in E is sewn and then normal sewing resumes. 3741M 3 Thread trimming is carried out. 2160M These functions cannot be used.
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 value displayed by the lower thread counter display 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 reaches “-5”.
6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) The operations described in this section should only be carried out by a technician. 6-1. Names and functions These are used for making advanced operating settings. They should only be used by a technician. (18) 2171M Slow start key • When this key is pressed so that the slow start icon (19) illuminates, the first two stitches sewn after the thread is trimmed are sewn at 700 rpm.
6. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 6-2. Adjusting the needle up stop position 2210M (–10 – 20) 1. While pressing the needle up/down key (1), turn on the power switch. 2. “n.0 xx” will appear in the main display (2). (“xx” is the setting value for the needle up stop position, and “0” is the default setting.) 3. Press the or key (3) to change the setting value for the needle up stop position.
7. USING THE CONTROL BOX PANEL (BASIC OPERATIONS) 7. USING THE CONTROL BOX PANEL (BASIC OPERATIONS) NOTE The control box panel will not operate when the machine head operation panel is connected. 7-1. Names and functions Power indicator 3133M The power indicator illuminates when the power switch is turned on. (1) Speed control • This lets you adjust the sewing speed when the treadle is fully depressed. • The sewing speed becomes faster when the speed control (1) is turned clockwise.
7. USING THE CONTROL BOX PANEL (BASIC OPERATIONS) 7-2. Sewing start and end backtacking and continuous backtacking and locking thread trimming Thread trimming not locked Thread trimming locked Thread trimming is carried out Thread trimming is carried out Thread trimming is not carried out. Thread trimming is not carried out. 3658M 1 Activating setting mode 2 Switching between start and end backtacking mode and continuous backtacking mode 3659M 1.
7. USING THE CONTROL BOX PANEL (BASIC OPERATIONS) Setting the number of stitches for start and end backtacking and continuous backtacking No. of stitches 3662M 3 1. Press the start backtack key (2) so that “A” is displayed in the top row of the stitch number display. 2. Press the end backtack key (3) to set the number of stitches for A in the bottom row of the stitch number display. Stitch number setting (A) (Example: 4) 4 Stitch number setting (B) 3663M 1.
7. USING THE CONTROL BOX PANEL (BASIC OPERATIONS) 7 Selecting “Thread trimming not locked” and “Thread trimming locked” T: Thread trimming setting 0: Thread trimming not locked (normal) 1: Thread trimming locked (For example 1: Thread trimming locked) 1. Press the start backtack key (2) so that “T” is displayed in the top row of the stitch number display. 2.
7. USING THE CONTROL BOX PANEL (BASIC OPERATIONS) 1 Press the power switch (1) to turn on the power. 3141M 2 1. Press the start backtack key (2) so that the start backtack indicator (3) illuminates. 2. Press the end backtack key (4) so that the end backtack indicator (5) illuminates. 3142M 3 Start backtacking is carried out. After it has finished, normal sewing continues for as long as the treadle remains depressed.
8. USING THE CONTROL BOX PANEL (ADVANCED OPERATIONS) 8. USING THE CONTROL BOX PANEL (ADVANCED OPERATIONS) The operations described in this section should only be carried out by a technician. NOTE: The control box panel will not operate when the machine head operation panel is connected. 8-1. Before setting any functions DANGER Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before opening the face plate of the control box.
8. USING THE CONTROL BOX PANEL (ADVANCED OPERATIONS) 8-3. Slow start The first two stitches sewn after the thread is trimmed are sewn at a speed of 700 rpm. After this, the sewing speed corresponds to the treadle depression amount. 1 1. Press the start backtack key (4) so that “S” is displayed in the top row of the stitch number display. 2. Press the end backtack key (2) to set the value in the bottom row of the stitch number display.
8. USING THE CONTROL BOX PANEL (ADVANCED OPERATIONS) 8-6. Setting the needle up stop position and needle down stop position Meaning of displays during setting • • The stop position is set numerically, and “A” to “F” represent the numbers “10” to “15” respectively. A setting value of “8” corresponds to an angle of rotation of approximately 8° for the upper shaft. Display A b c d E F Value 10 11 12 13 14 15 1 1.
9. SEWING 9. 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.
9. SEWING 9-3. Sewing condensed stitches If you press the actuator (1) or the reverse lever (2) while sewing is in progress, you can sew stitches (forward direction) with small stitch lengths. Before carrying out sewing, set the stitch length for condensed stitches as follows. Sewing direction Condensed stitches 3746M 3747M Unlocked Locked 1. Lift up the dial lock lever (3) to release the lock. 2. Turn the stitch length dial (4) to the stitch length to be used for condensed stitches. 3.
10. THREAD TENSION 10. THREAD TENSION 10-1. 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 0572M Upper thread tension too weak or lower thread tension too strong Increase the upper thread tension. Decrease the lower thread tension.
10. THREAD TENSION 10-2. Adjusting the presser foot pressure Correct stitches Upper thread 0894M 0895M Skipped stitches occur Increase the pressure. 0896M 0897M Uneven stitch length Stitches are puckered Decrease the pressure. The presser foot pressure should be as weak as possible, but strong enough so that the material does not slip. Becomes weaker 1. Loosen the adjusting nut (1). 2. Turn the presser adjusting screw (2) to adjust the presser foot pressure. 3. Tighten the adjusting nut (1).
11. CLEANING 11. CLEANING CAUTION 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. Be sure to wear protective goggles and gloves when handling the lubricating oil and grease, so that they do not get into your eyes or onto your skin, otherwise inflammation can result. Furthermore, do not drink the oil or eat the grease under any circumstances, as they can cause vomiting and diarrhea.
11. CLEANING 3678M 2. Lubrication A. Gearbox oil quantity NOTE: Check the quantity of oil in the gearbox immediately after tilting back the machine head. When the machine head is left for long periods in the tilted-back position, the amount of oil in the felt inside the gearbox drops and the oil level seen from the oil window (1) rises, so that it becomes impossible to measure the actual oil level accurately.
11. CLEANING B. 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 page 8.) Upper reference line Lower reference line 3752M 3. Checking 1. Replace the needle if it is bent or if the tip is broken. 2. Check that the upper threads have been threaded correctly. (Refer to page 15.) 3. Carry out a test sewing.
11. CLEANING 11-2. Applying grease [When “GrEASEUP” appears…when using the operation panel] If “GrEASEUP” flashes on the main display (1) and a buzzer sounds when the power switch is turned on, it means that grease needs to be applied. (The sewing machine will not operate at this time, even if the treadle is depressed.) Apply grease as required, while referring to the following for details. 2191M 1. Press the RESET key (2). 2.
11. CLEANING <-403, 405, 433 specifications> <-433 specifications> grease 1. Turn the pulley to raise the needle bar to a position where the slide block guide (1) can be seen. 2. Apply grease to the slide block guide (1) in the places shown in the illustration. 3755M 3754M 1. 2. 3. 4. Turn the power switch to “OFF”. Remove the screws. Apply grease to each of the holes until the grease overflows slightly. The grease will be pushed in when the screws are tightened. 5.
11. CLEANING 11-3. Applying grease [When “GU” appears ... when using the control box panel] DANGER Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before opening the face plate of the control box. Touching areas where high voltages are present can result in severe injury. If “GU” flashes in the stitch number display (1) on the control box panel when the power switch is turned on, it indicates that it is time for grease to be applied.
11. CLEANING <-403, 405, 433 specifications> <-433 specifications> grease 1. Turn the pulley to raise the needle bar to a position where the slide block guide (1) can be seen. 2. Apply grease to the slide block guide (1) in the places shown in the illustration. 3755M 3754M 3756M 1. Turn the power switch to “OFF”. 2. Remove the screws. 3. Apply grease to each of the holes until the grease overflows slightly. 4. The grease will be pushed in when the screws are tightened. 5.
12. ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT 12. 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, otherwise injury may result. 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. 2303M Approx.
13. STANDARD ADJUSTMENTS 13. STANDARD ADJUSTMENTS CAUTION 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 and inspection of the sewing machine should only be carried out by a qualified technician. Ask your Brother dealer or a qualified electrician to carry out any maintenance and inspection of the electrical system.
13. STANDARD ADJUSTMENTS 13-2. Adjusting the safety switch position The safety switch (1) is normally installed as shown in figure [A]. However, if the processing method used for the table leaves too much space between the machine head and the table hole, it may adversely affect the operation of the safety switch (1). 3689M The standard amount of clearance between the machine head and the table hole is 1.5 mm. If the clearance is 3.
13. STANDARD ADJUSTMENTS 13-3. Adjusting the thread take-up spring The standard position of the thread take-up spring (1) is 6-8 mm [4-6 mm for -405 specifications] above the surface of the thread guide (3) when the presser foot (2) is lowered. 1. Lower the presser foot (2). 2. Loosen the set screw (4). 3. Turn the thread tension bracket (5) to adjust the spring position. 4. Securely tighten the set screw (4).
13. STANDARD ADJUSTMENTS 13-4. Adjusting arm thread guide R Becomes greater 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). Becomes less * 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.
13. STANDARD ADJUSTMENTS 13-6. Adjusting of the feed dog height The standard height of the feed dog (1) when it is at its maximum height above the top of the needle plate is 1.0 mm for -4[]3 specifications, and 1.2 mm for -405 specifications. <-4[]3> 1.0 mm <-405> 1.2 mm 3764M 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.
13. STANDARD ADJUSTMENTS 13-7. Adjusting the feed dog angle The standard angle is for the feed dog (1) to be parallel to the needle plate when the machine pulley is turned forward to raise the feed dog (1) from its lowest position until it is flush with the top of the needle plate. 1. Turn the machine pulley forward to raise the feed dog (1) from its lowest position until it is flush with the top of the needle plate, and stop turning the pulley at that point. 2. Tilt back the machine head. 3.
13. STANDARD ADJUSTMENTS 13-8. Adjusting the needle bar height 3771M Adjust so that the distance from needle plate mounting surface A to the bottom edge of the needle bar (1) is the same as the height of surface B on the <1> side of the accessory timing gauge (2) when the needle bar (1) is at its lowest position as shown in the illustration. 1. Remove the presser foot (3), the needle plate (4) and the feed dog (5). 2. Turn the machine pulley to set the needle bar (1) to its lowest position. 3.
13. STANDARD ADJUSTMENTS 13-9. Adjusting the needle and feed mechanism timing <-4[]3> <-405> Approx. 2 mm 3773M Approx. 4 mm The standard timing is for the tip of the needle to be in the position given below when the machine pulley is turned forward to raise the feed dog (1) from its lowest position until it is flush with the top of the needle plate (2). (At this time, the “-” mark on the lower shaft will be aligned with the center of the scale (4) (“O” mark) on the vertical cam (3).
13. STANDARD ADJUSTMENTS 13-10. Adjusting the needle and rotary hook timing When the machine pulley is turned forward to raise the needle bar (1) 1.8 mm (2.2 mm for -405 specifications) from its lowest position, the rotary hook tip (3) should be aligned with the center of the needle (4) as shown in the illustration when the distance from needle plate mounting surface A to the bottom edge of the needle bar (1) is the same as the height of surface C on the <2> side of the accessory timing gauge (2).
13. STANDARD ADJUSTMENTS 13-11. Adjusting the treadle 2301M If the machine starts running at low speed when your foot is simply resting on the treadle, or if the treadle pressure is felt to be too weak, adjust the position (a to c) at which the treadle spring (1) is hooked onto the treadle lever (2). * a is the weakest position, and it becomes gradually stronger at b and c respectively. 1.
14. TROUBLESHOOTING 14. 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. DANGER Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before opening the face plate of the control box. Touching areas where high voltages are present can result in severe injury.
14. TROUBLESHOOTING Problem 5 Possible cause Skipped stitches at sewing start Thread unravelling at sewing start 0749M 6 Uneven seam 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 upper threads too short after thread trimming? Adjust the pretension.
14. TROUBLESHOOTING Problem 8 Possible cause Lower thread is tangled at the sewing start. Spinning of bobbin during thread trimming Lower thread 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 that 80 %. 2124M Is the anti-spin spring attached? Attach the anti-spin spring.
14. TROUBLESHOOTING Problem 12 Possible cause Broken needles Page Is the material being pushed or pulled with excessive force during sewing? Is the needle properly installed? If it is incorrect, install the needle correctly. Is the needle bent, is the needle tip broken, or is the needle hole blocked? Replace the needle. Is the needle and rotary hook timing correct? Adjust the height of the needle bar. Adjust the clearance between the needle and the tip of the rotary hook.
14. TROUBLESHOOTING Problem 17 Nothing appears on the operation panel display. Possible cause Is the power supply connector disconnected from the control box? Insert the connector securely. Is the operation Page 2196M 11 panel connector inside the control box disconnected? Insert the connector securely. 10* 3154M 18 61 “GrEASEUP” or “GU” flashes in the panel display when the power switch is turned on. This display is to notify you that it is time to apply grease. Apply grease.
14. TROUBLESHOOTING 14-2. 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. 2198M 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.
14. TROUBLESHOOTING Error code Err 5 (Safety switch operated) Possible cause Is the machine connector inside the control box disconnected? Insert the connector securely. Is the machine head tilted back? Return the machine head to its normal position. Check the operation of the safety switch.
14. TROUBLESHOOTING Error code Err 12 (Solenoid power supply error) Possible cause * Problem with control P.C. board. Replace the control box. Err 13 (Treadle unit error) 3702M Is the treadle unit connector inside the control box disconnected? Insert the connector securely. Is there an open circuit in the treadle connector harness? Replace the treadle unit. Err 14 (Head detector unit error) Page Is solenoid fuse F2 (5A) blown? Replace the fuse.
14. TROUBLESHOOTING Error code Err 21 (Thermistor error) Possible cause Page Is connector CN16 inside the control box disconnected? Insert the connector securely. * 3159M Err 100 (GrEASEUP) This appears on the display when the sewing machine has continued to be used for a certain period after the “GrEASEUP” notification appears without the grease being applied (without the reset procedure being carried out). Apply grease and then carry out the reset procedure.
14. TROUBLESHOOTING (Error code) If an error code is displayed on the control box panel 1. Make a note of the error code and then turn off the power. 2. After the display of the control box panel turns off, eliminate the cause of the error and then turn the power switch back on. 3161M 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.
INSTRUCTION MANUAL http://www.brother.com/ 15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone: 81-52-824-2177 © 2006 Brother Industries, Ltd. All Rights Reserved. S-7220B SA7437-001 E 2006.06.
