Z-8550A Z-8560A 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 below 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.
[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 high-frequency welders. Sources of strong electrical noise may cause problems with correct operation.
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. Never touch the knife on the face plate when opening the thread takeup guard cover at times such as when taking up slack in the thread, otherwise injury may result.
CAUTION Maintenance and inspection Maintenance and inspection of the sewing machine should only be carried out by a qualified technician. Ask your Brother dealer or a qualified electrician to carry out any maintenance and inspection of the electrical system. Turn off the power switch and disconnect the power cord from the wall outlet at the following times, otherwise the machine may operate if the treadle is depressed by mistake, which could result in injury.
4 Direction of operation 5 6 Do not touch the thread take-up or the knife, otherwise injury may result. If the actuator is pressed by mistake when using the correction sewing function, the needle will move in a zigzag motion while the machine is operating, and injury may result.
CONTENTS 1. NAMES OF MAJOR PARTS................ 1 6-2-7. Setting end backtacking (8560A, 855A-A31 only) ........................35 2. MACHINE SPECIFICATIONS .............. 2 6-2-8. Setting continuous backtacking (8560A and 8550A-A31 only) ................36 3. SEWING PATTERN TABLE ................ 3 6-2-9. Setting fixed stitches/name label sewing (8560A, 8550A-A31 only) ..........37 6-3. Using the lower thread counter.........................39 4. INSTALLATION....................................
12. STANDARD ADJUSTMENTS............ 59 12-1. Actuator position ............................................ 59 12-2. Adjusting the safety switch position................ 60 12-3. Adjusting the thread tension spring ................ 61 12-4. Adjusting the presser foot height.................... 62 12-5. Adjusting the feed dog height......................... 62 12-6. Adjusting the feed dog angle.......................... 63 12-7. Adjusting the forward/back position of the feed dog ...........................
1. NAMES OF MAJOR PARTS 1.
2. MACHINE SPECIFICATIONS 2. MACHINE SPECIFICATIONS 8550A Thread trimmer Upper thread feeding device Back tack/condense device *1 Thread wiper Use Max. stitch length Max. sewing speed Sewing pattern Max. zigzag width Thread take-up lever Needle bar stroke Feed dog height Presser foot Lifting lever height Knee lifter Presser foot pressure Needle Motor Power supply Control circuit 0 - A c - 8560A 4 c c c c 8550A 8560A -031, -A31 -431 For light-weight materials-For medium- weight materials 2.
3. SEWING PATTERN TABLE 3. SEWING PATTERN TABLE • This sewing machine is equipped with the following built-in sewing patterns. Select the pattern number from the operation panel to use a pattern. (Refer to page 26.) • Different zigzag widths and zigzag lengths can be set for each sewing pattern. (Refer to page 18 and 31.) Pattern no.
4. INSTALLATION 4. 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 49 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.
4. INSTALLATION 4-1. 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. • Select a method that is easy to carry out for the type of table used. Cotton stand hole Cord hole Head rest hole Control box mounting hole 3353M This type has a wider front/back dimensions at the front of the sewing machine.
4. INSTALLATION 4-2. Installation 1. Control box (1) (2) (3) (4) (5) Control box Bolts [4 pcs] Nuts [4 pcs] Spring washers [4 pcs] Washers [4 pcs] 2. Connecting rod (6) Connecting rod (7) Nut 3355M 3. Power switch (1) Power switch (2) Screws [2 pcs] (3) Staples [5 pcs] Operator Secure the power cord (4) in a suitable place depending in the position of the wall outlet. 3356M 4.
4. INSTALLATION 5. Rubber cushions (1) Rubber cushions [2 pcs] (2) Nails [4 pcs] 6. Knee lifter complying bar (3) Knee lifter complying bar 3358M 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. 3359M 8.
4. 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. 2098M 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. 3362M 1. Turn the machine pulley so that the feed dog is below the top of the needle plate. 2.
4. INSTALLATION 4-3. 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.
4. INSTALLATION 4-4. 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.
4. INSTALLATION Push in securely until the tabs (16) engage. Ground symbol Insert firmly until a click is heard. Press the tab. 3369M (2) (3) (4) (5) (6) (7) (8) (9) Connector 4-pin motor connector 5-pin zigzag motor connector 7-pin head detector unit connector 14-pin machine connector 14-pin encoder connector 8-pin operating panel connector 5-pin zigzag motor encoder connector 3-pin DC fan connector (oil pan) P.C.
4. INSTALLATION 3. Closing the cover (2) Screw [6 pcs: With washer] (3) Cover Tighten 3370M 4. Power cord (1) Power cord Insert the power cord plug (2) into a wall outlet. 1. Attach an appropriate plug to the power cord (1). (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.
4. INSTALLATION 4-5. 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. 4-5-1. Turning on the power • Release the treadle when turning on the power. (If the treadle is depressed, “Err 95” will appear in the main display. At this time, “PoFF” will appear when you take your foot off the treadle, so turn the power off and back on again.
4. INSTALLATION 4-5-2. Operating the treadle 2116M 1. When the treadle (3) is gently depressed to position (B), low-speed sewing is carried out. 2. If it is then depressed as far as (C), high-speed sewing is carried out. 3. When the treadle (3) is pressed forward and then back to the neutral position (A), the needle will stop below the needle plate (when needle down stop mode has been set).
5. PREPARATION BEFORE SEWING 5. PREPARATION BEFORE SEWING 5-1. 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. 1. Turn the machine pulley to move the needle bar to its highest position. 2. Loosen the screw (1). 3.
5. PREPARATION BEFORE SEWING 5-3. 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.
5. PREPARATION BEFORE SEWING 5-5. Threading the upper thread CAUTION Turn off the power switch before threading the upper thread. The machine may operate if the treadle is dep ressed by mistake, which could result in injury. If the actuator is pressed by mistake when using the correction sewing function, the needle will move in a zigzag motion while the machine is operating, and injury may result.
5. PREPARATION BEFORE SEWING 5-6. Adjusting the stitch length 3470M (Zigzag width) Turn the stitch length dial (1) until the desired stitch length number is aligned with the index mark (2) above the dial. * The larger the number, the longer the stitch length will be. * The numbers on the dial are for use as a guide. The length of the finished stitches may vary depending on the type and thickness of material being sewn. Adjust while looking at the finished stitches.
5. PREPARATION BEFORE SEWING 5-7. Backtacking • Backtack stitches with short stitch lengths can be sewn easily during sewing just by pressing the reverse lever (1). This is useful for preventing fraying of the seam at the sewing end. • Before sewing, turn the condense dial (2) to the left or right to set the stitch length for these shorter backtack stitches. If using the 8560A, 8550A-A31 The actuator (3) can be used instead of the reverse lever (1).
5. PREPARATION BEFORE SEWING 5-8. Using the knee lifter 3388M The presser foot (2) can be raised by pressing the knee lifter plate (1). 3389M 5-9. Using the thread wiper (8560A only) Press the thread wiper switch (1) to the side. If this is done, the thread wiper (2) will operate after the thread is trimmed.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) 6. USING THE OPERATION PANEL (BASIC OPERATIONS) 6-1. Names and functions • The operation panel keys cannot be operated while sewing is in progress. Check the key selections and pattern settings before starting sewing.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) The power indicator illuminates when the power switch is turned on. (1) Sewing speed control display This shows the sewing speed when the treadle is depressed to the maximum amount. • If all bars are illuminated, it indicates that the maximum speed can be set. • If all bars are switched off, it indicates the minimum speed (220 rpm).
6. USING THE OPERATION PANEL (BASIC OPERATIONS) (8) RESET key This key is used to return the lower thread counter to its initial value and to cancel warning conditions. • If this key is pressed when the lower thread counter value is “0” or less, the value will return to the initial value. • If this key is pressed for 2 seconds or more while the lower thread counter value is “1” or 2156M more, the value will return to the initial value.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) (18) Start backtack key [Z-40 only] When this key is pressed so that the indicator illuminates, the number of start backtack stitches (0−99) in the A and B stitch number displays is sewn. (19) End backtack key [Z-40 only] When this key is pressed so that the indicator illuminates, the number of end backtack stitches (0−99) in the C and D stitch number displays is sewn.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) 6-2. Pattern setting method 6-2-1. Sewing pattern table • This sewing machine is equipped with the following built-in sewing patterns. Select the pattern number from the operation panel to use a pattern. (Refer to page 26.) • Different zigzag widths and zigzag lengths can be set for each sewing pattern. (Refer to page 18 and 31.) Pattern no.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) 6-2-2. Setting the sewing pattern Press the sewing pattern select keys ([1] to [7] in the illustration left) to select the sewing pattern. The indicator for the key that was pressed will illuminate and the pattern number that has been set for that key will appear in the main display . * When a sewing pattern has been set, be sure to set the zigzag width. (Refer to page 31.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) [5] Blind stitching If selecting blind stitching, set the number of stitches to be sewn in a straight line. Example: [ 7-5 ] Example: [ 7-10 ] 5 stitches 10 stitches 3419M 1 Setting the sewing pattern When the blind stitch key is pressed, the indicator in the top-left corner of the key will illuminate and “left” blind stitching will be selected.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) [6]Scallop patterns When selecting a scallop pattern, set the type of scallop to be sewn. 1 Setting the sewing pattern When the scallop key is pressed, the indicator in the top-left corner of the key will illuminate and “left” scalloping will be selected. 3424M If the key is pressed once more, the indicator in the top-right corner of the key will illuminate and “right” scalloping will be selected.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) Scallop patterns can be reflected while sewing. Example: Pattern number [ 5-1A ] or When selecting the type of scallop, press the key (1) so that “A” (2) is displayed. or key (1) once more, the “A” (If you press the display will disappear and the reflection pattern setting will be cancelled.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) [7] T stitch Memory switch settings can be used to sew T stitches easily. (Refer to the service manual or ask the place of purchase for details on the memory switch setting method.) 3595M [8] Custom-made patterns (option) For details, refer to the place of purchase. * Up to a maximum of 99 sewing patterns can be added by creating sewing patterns using the PS-300B (option).
6. USING THE OPERATION PANEL (BASIC OPERATIONS) 6-2-3. Setting the zigzag width Set the zigzag width after selecting the pattern number. The zigzag width is defined as the distance between the leftmost needle drop point and the rightmost needle drop point. If the zigzag width is increased or reduced, the width of the sewing pattern is also increased or reduced by the same proportion. * The zigzag width will be automatically set to [0.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) 6-2-4. Setting the zigzag base line position The zigzag base line is the “center” of the zigzag stitch, or in other words, it is like a center line drawn through the sewing pattern. By moving the zigzag base line position, you can move the sewing pattern to the left and right within the maximum range for the pattern width.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) 6-2-5. Setting the zigzag stop position When the plain zigzag, 2-step zigzag, 3-step zigzag or scallop sewing patterns are selected, you can set whether the needle stops when it is at the right side or the left side of the sewing pattern. (If the right stopping has been set, the needle stop position will be the position shown by ○ in the illustration below.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) 6-2-6. Setting start backtacking (8560A, 8550A-A31 only) After thread trimming (or after the treadle has been depressed backward for the 8550A-A31), you can sew a set number of stitches to create start backtack stitches.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) 6-2-7. Setting end backtacking (8560A, 855A-A31 only) After the treadle has been depressed backward, you can sew a set number of stitches to create end backtack stitches.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) 6-2-8. Setting continuous backtacking (8560A and 8550A-A31 only) You can carry out continuous backtacking for the set number of stitches at the sewing start after thread trimming has been carried out (after the treadle has been depressed backward for the 8550A-A31). 1 Example: NOTE: This operation is possible after thread trimming has been carried out (after the treadle has been depressed backward for the 8550A-A31).
6. USING THE OPERATION PANEL (BASIC OPERATIONS) 6-2-9. Setting fixed stitches/name label sewing (8560A, 8550A-A31 only) You can carry out fixed stitch/name label sewing for the set number of stitches at the sewing start after thread trimming has been carried out (after the treadle has been depressed backward for the 8550A-A31).
6. USING THE OPERATION PANEL (BASIC OPERATIONS) 1 Example: From 1 to 250 stitches can be set for the E and F stitch numbers. 2 3445M 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.40). After this, rotate the material.
6. USING THE OPERATION PANEL (BASIC OPERATIONS) 6-3. 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 “-1”.
7. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 7. USING THE OPERATION PANEL (ADVANCED OPERATIONS) The operations described in this section should only be carried out by a technician. 7-1. Names and functions * The illustration shows the Z-ST (for 8550A-031). These are used for making advanced operating settings. They should only be used by a technician.
7. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 7-2. Adjusting the needle up stop position 3454M 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 OPERATION PANEL (ADVANCED OPERATIONS) 7-3. LOCK key When the power switch is turned on, the LOCK key (1) turns ON. (The icon (2) is illuminated.) In this state, the following three key operations are disabled so that the setting values cannot be changed accidentally. FUNC key (3) This key is used to make settings for various functions. ENTER key (4) This key is used to accept function settings. MAX key (5) This key is used to change the maximum sewing speed.
7. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 7-5. Using user programs Sewing pattern, zigzag width, zigzag base line position and zigzag stop position settings can be combined and recorded in up to three different types of pattern (P1, P2 and P12). It can be useful for combinations of frequently-used settings such as sewing pattern and zigzag width (sewing data) are recorded into user programs, so that they can be easily retrieved and used.
7. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 7-5-2. Retrieving recorded sewing data Sewing data that has been recorded in a user program can be retrieved simply by pressing a key. NOTE: A user program cannot be retrieved if it contains no sewing data. Record sewing data into a user program before carrying out this operation. (Refer to the previous page.) 1 Press the key (P1, P2 or P1 + P2) that was used to record the sewing data to be retrieved. (For P1 + P2, press and hold P1 and then press P2.
7. USING THE OPERATION PANEL (ADVANCED OPERATIONS) 7-6. Setting the maximum sewing speed 1 If the LOCK key icon (1) is illuminated, press the LOCK key for 2 seconds or more to cancel the lock. • The icon (1) will switch off and the lock will be cancelled. (Press for 2 seconds or more) 2 (Current setting) 3459M • The main display will change from an orange display to a green display.
8. SEWING 8. 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. 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 0572M 0573M Upper thread tension too weak or lower thread tension too strong Increase the upper thread tension. Decrease the lower thread tension.
9. THREAD TENSION 9-2. Adjusting the presser foot pressure Correct stitches 0578M Skipped stitches occur Increase the pressure. Uneven stitch length 0579M Stitches are puckered Decrease the pressure. 0580M 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).
10. CLEANING 10. 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. Do not directly touch sharp objects such as the tip of the rotary hook when cleaning the rotary hook, otherwise injury may result. When removing the needle plate, auxiliary needle plate and knife unit, use a screwdriver that matches the size of the screw heads.
10. CLEANING 3476M 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.
10. 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 9.) Upper reference line Lower reference line 3479M 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 17.) 3. Carry out a test sewing.
10. CLEANING 10-2. Applying grease (When “GREASEUP” appears…) 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 while referring to the following page. 3481M < To continue sewing temporarily without applying grease > 1. Press the RESET key (2). 2.
10. CLEANING Use Brother-specified grease (SA2355-001). 1. Using the tube 2216M 2. Applying grease 1. Turn the power switch to “OFF”. 2. Apply grease in the places indicated by arrows [A]−[G] below. 3482M 1. Remove the screws 2. Apply grease to each of the holes until the grease overflows slightly. Grease 3484M 3. Tighten the screw to push in the grease. 4.
10. CLEANING Use the tip of a long brush or similar to apply approx 1 g of grease to the places indicated by arrows [E] to [G]. 2. Apply approx 1 g of grease. 1. Pull the needle bar (3) forward with your finger. 3. Turn the machine pulley to gently apply the grease onto the felt. Felt 4. Move the needle bar (3) back and forth with your finger to spread the grease. After applying approximately 1 g of grease to the groove, move the needle bar (3) back and forth with your finger to spread the grease.
11. REPLACING PARTS 11. REPLACING PARTS CAUTION Replacement of parts should only be carried out by a qualified technician. Turn off the power switch and disconnect the power cord from the wall outlet before replacing any parts, otherwise the machine may operate if the treadle is pressed by mistake, which could result in injury. When removing the needle plate, auxiliary needle plate and knife unit, use a screwdriver that matches the size of the screw heads.
11. REPLACING PARTS 11-2. Gauge parts (presser foot, needle plate and feed dog) Notes when replacing gauge parts (Points which must be noted) 11-2-1. Replacing the stopper If using the presser foot, needle plate and feed dog for a zigzag width of something other than 8 mm, needle breakages may occur when the sewing machine is operating, so be sure to limit the zigzag width and replace the stopper as described below. Stopper For 8 mm Standard part (Installed to the sewing machine White (A=16.
11. REPLACING PARTS 11-2-2. Changing the feed amount to long stitch specifications (from 2.0mm to 5.0mm) 1. Replace the feed dog (1) and needle plate (2) with the ones for long stitches. 2. After this, change the maximum feed amount as described below. 3498M 11-2-3.
11. REPLACING PARTS 6. Check that the feed dog does not touch the needle plate both when the reverse lever (9) is not lowered and when it is lowered. If it touches, adjust the forward/back installation position (centering) of the feed dog. 3502M 7. Without lowering the reverse lever (9), move the stopper (5) up until it touches F-regulator connecting rod (10), and then tighten the screw (3). (Fig. A) [A] 3503M 8.
12. STANDARD ADJUSTMENTS 12. STANDARD ADJUSTMENTS CAUTION Maintenance and inspection of the sewing machine should only be carried out by a qualified technician. 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. Ask your Brother dealer or a qualified electrician to carry out any maintenance and inspection of the electrical system.
12. STANDARD ADJUSTMENTS 12-2. 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). 3508M The standard amount of clearance between the machine head and the table hole is 1.25 mm.
12. STANDARD ADJUSTMENTS 12-3. Adjusting the thread tension spring 3511M The standard position of the thread tension spring (1) is 5-8 mm 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).
12. STANDARD ADJUSTMENTS 12-4. 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 presser bar lifter (2). 1. Loosen the two screws (3) and then remove the thread take-up guard (4). 2. Loosen the nut (5) of the adjustment screw (6), and then turn the adjustment screw (6) so that there is no pressure applied to the presser foot. 3. Raise the presser bar lifter lever (2). The presser foot (1) will also rise. 4.
12. STANDARD ADJUSTMENTS 12-6. Adjusting the feed dog angle 3517M standard The standard angle for the feed dog (1) is for the top of the needle plate to be parallel with the top of the feed dog (1) (for the 8550A) or raised slightly at the side closest to the operator (for the 8560A) when the feed dog (1) is raised to its highest position above the needle plate. (with the O mark on the feed bracket shaft (2) aligned with the mark on the feed rocker bracket arm (3)). 1.
12. STANDARD ADJUSTMENTS 12-8. Adjusting the needle bar height 3521M With the accessory needle bar height gauge (2) installed to the needle bar (1), adjust so that the needle bar height gauge (2) is touching the top of the needle plate (3) when the needle bar is at its lowest position. 1. Remove the needle (4) and the presser foot (5). For the 8560A (Refer to Fig. A) 1) Remove the needle plate (3) and then auxiliary needle plate (6). 2) Remove the spacer (7).
12. STANDARD ADJUSTMENTS 3524M 4. Remove the presser foot (3), needle plate (4), auxiliary needle plate (5), feed dog (6) and spacer (7) (856A only). 5. Turn the machine pulley to raise the needle bar (8) from its lowest position until the reference line on the thread takeup (9) is aligned with the Ø mark on the face plate, and then check the following. • The tip of the rotary hook (10) should be aligned with the center of the needle.
12. STANDARD ADJUSTMENTS 12-11. 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, 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. 3529M Approx.25 mm Approx.
12. STANDARD ADJUSTMENTS 12-12. Adjusting the presser foot floating amount (minute lifting amount) 3532M Floating amount When sewing stretch materials and materials with long pile, you can make minute adjustments to the floating amount for the presser foot (1) in accordance with the material. 1. Turn the sewing machine pulley by hand to move the feed dog (2) below the needle plate (3). 2. Use the lifting lever to lower the presser foot (1). 3. Loosen the nut (4). 4.
12. STANDARD ADJUSTMENTS 12-14. Adjusting the position of the thread trimming cam (8560A only) 3535M The knife unit (1) should already be installed in the correct way when the following adjustments are carried out. 1. Tilt back the machine head. 2. Loosen the two screws (2). 3. Move the stopper (4) to adjust so that the edge of the movable knife (3) is 0.5 mm inside the edge of the knife unit (1). 4. Securely tighten the two screws (2). 5.
12. STANDARD ADJUSTMENTS 12-15. Adjusting the tension of the lower thread presser spring (8560A only) 3539M 3540M Adjust the tension of the lower thread presser spring (1) so that the tension is 0.03 to 0.11 N when the lower thread presser spring (1) is pulling the lower thread (nylon thread: 100D 1 X 3 (Z)) after thread trimming. 1. Remove the knife unit (2). (Refer to page 55.) 2. Move the knob (3) to slide out the movable knife (4), and then hook the thread as shown in the illustration. 3.
12. STANDARD ADJUSTMENTS 3543M The standard upper thread trailing amount after thread trimming varies as shown below depending on the type of thread used. Stronger Upper thread Nylon 100D 1 X 3(Z) #60 spun Weaker Upper thread trailing amount 50-60mm 40-50mm If adjustment is necessary, adjust the position of the wire e as described below. Should not touch Longer Shorter Seen from direction (B) 1. Loosen the set screw (1). 2.
13. OPTIONAL PARTS 13. OPTIONAL PARTS CAUTION Installation of optional parts should only be carried out by a qualified technician. Turn off the power switch and disconnect the power cord before installing any optional parts, otherwise the machine will operate if the treadle is pressed by mistake, which could result in injury. If any safety devices have been removed, be absolutely sure to re-install them to their original positions and check that they operate correctly before using the machine.
13. OPTIONAL PARTS 3548M 1. Pass presser bar U (15) through the bushing (16) from above. 2. Use a spanner or similar tool to securely tighten presser bar tip A (17) or presser bar tip B (18) into presser bar U (15). 3. Fit the guide bracket (13) into presser bar U (15) and the groove (A) in the arm, and provisionally secure it in place with the screw (12). 4. Install the presser foot to presser bar tip A (17) or presser bar tip B (18). 5.
14. WHEN USING A NON-STANDARD FEED DOG (8560A only) 14. WHEN USING A NON-STANDARD FEED DOG (8560A only) When using a non-standard feed dog, modify it as shown below. * Using a non-standard feed dog without modifying it will break the movable and fixed knives. 11 R5.5 15 11 11 4 0.
15. TROUBLESHOOTING 15. 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.
15. TROUBLESHOOTING 3 Problem Skipped stitches while sewing occur 0621M 4 Flattened zigzags appear in the stitch during intermittent sewing (8550A) 1406M 5 Skipped stitches at sewing start Thread unravelling at sewing start 0622M Upper thread 0623M 75 Possible cause • 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.
15. TROUBLESHOOTING 6 Problem Uneven seam 0625M 7 Horizontal thread tightening not balanced Upper thread Lower thread Possible cause • 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. • Is the upper thread tension or lower thread tension too strong or to weak? Adjust the upper thread tension or lower thread tension.
15. TROUBLESHOOTING 9 Problem Lower thread is tangled at the sewing start. Spinning of bobbin during thread trimming Lower thread 0628M 10 Upper and lower threads are breaking. Possible cause • 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 %.
15. TROUBLESHOOTING 12 13 14 15 Problem Incorrect thread trimming (8560A) (Upper and lower threads are both not being trimmed) Incorrect thread trimming (8560A) (Upper thread or lower thread is not being trimmed) The thread wiper does not wipe the thread. (8560A) Possible cause • Is the fixed knife or movable knife damaged or worn? Replace the fixed knife or the movable knife. • Is the thread trimming timing correct? Adjust the rotating direction of the thread trimming cam.
15. TROUBLESHOOTING 15-2. Error code displays 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. 3559M Items with a “*” in the “Page” column should only be checked by a qualified technician. Error code Err 50 (Safety switch operated) Possible cause • Is the machine connector 14P inside the control box disconnected? Insert the connector securely.
15. TROUBLESHOOTING Error code Err 130 (Upper shaft motor locked） Err 131 (Upper shaft encoder not connected) Possible cause • Is the motor connector 4P disconnected from the control box? Insert the connector securely. Page 3563M 11* • Has the machine locked up? Turn off the power and then turn the machine pulley by hand and check that it turns easily. • Is the encoder connector 14P inside the control box disconnected? Insert the connector securely.
15. TROUBLESHOOTING Error code Err 452 (Machine head memory error) Possible cause • Is the 7-pin head detector unit connector inside the control box disconnected? Insert the connector securely. Page 11* 3566M Err 700 (Overvoltage) • Does the power supply voltage match the control box voltage specifications? Check the voltage. Voltage rating label 3567M Err 705 (Under voltage) Err 710 (Overcurrent) • Abnormal drop in power supply voltage. Check the input voltage.
INSTRUCTION MANUAL http://www.brother.com/ 15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone: 81-52-824-2177 © 2005 Brother Industries, Ltd. All Rights Reserved. Z-8550A ,8560A SA6035-001 E 2005.09.
