DH4-B980 RH-9800 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 lever, 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. If using a work table which has casters, the casters should be secured in such a way so that they cannot move. The sewing machine should not be used for any applications other than sewing. Attach all safety devices before using the sewing machine. If the machine is used without these devices attached, injury may result.
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. 2 1 3 Safety devices Eye guard Finger guard Needle bar guard Belt cover, etc. Do not touch the knife or press any objects against the machine while sewing, as this may result in personal injury or damage to the machine.
CONTENTS 1. NAMES OF EACH PART ............................1 2. SPECIFICATIONS ..........................................2 2-1. Specifications .......................................................2 3. INSTALLATION .................................................3 3-1. Table processing diagram .................................3 3-2. Installing the motor .............................................4 3-3. Installing the machine head ...............................4 3-4. Installing the oil container ......
1. NAMES OF EACH PART 1.
2. SPECIFICATIONS 2. SPECIFICATIONS 2-1. Specifications Lower thread trimmer Upper thread trimmer DH4-B980- Long type Short type - - -00 RH-9800- -01 - -02 - * * -02 is further divided into L1 - L7 specifications in accordance with the stitch length. Please be sure to specify the stitch length when ordering.
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 more than 87 kg. The installation should be carried out by two or more people. Do not connect the power cord until installation is complete, otherwise the machine may operate if the start switch is pressed by mistake, which could result in injury.
3. INSTALLATION 3-2. Installing the motor 1. Insert the three bolts (1) into the work table. 2. Turn the work table upside down to make it easier to install the motor (2). 3. Align the motor (2) with the bolts (1), and then install the motor (2) to the underside of the work table with the three washers (3) and the three nuts (4). Note: Do not use the cushion rubber. If you use it, V belt tension cannot be adjusted. (1) (3) (4) (2) 1098Q 3-3.
3.INSTALLATION Raising the machine head (2) (3) (1) (4) (5) (3) (2) (1) When machine head is lowered When machine head is raised 0809Q 0810Q 1. While holding the handles of the machine head (1) with both hands, gently raise the machine head. Note: Be sure to turn the power supply off before raising the machine head. 2. If you wish to keep the machine head in the raised position, insert the head support lever (2) securely into the hinge lever support shaft (3).
3. INSTALLATION 3-5. Installing the spool stand 1. To assemble the spool stand (1), follow the instructions in the manual that came with the spool stand (1). 2. Secure the spool stand (1) to the rear right corner of the work table with the washer and nut (2). (1) (2) 0815Q 3-6. Tightening the V-belt (1) 1198Q (9) (10) (6) 0.1N (8) Approx. 10 mm (2) (7) (3) (1) (1) (5) (4) (9) Motor pulley 1100Q 1. 2. 3. 4. 5. 6. 7. 8. 9. 1101Q Open the rear cover.
3.INSTALLATION 3-7. Installing the control box 1. Align the four bolt holes in the control box (1) with the four holes in the work table. 2. Install the control box (1) with the four bolts (2), spring washers (3) and flat washers (4) 3. Push the four caps (5) in over the top of the bolts (2). (5) (2) (3) (4) (1) 1102Q 3-8. Installing the air unit and the valve assembly Refer to the work table processing diagram on page 3 for the installation position.
3. INSTALLATION 3-9. Connecting the ground wires and the wirings 1106Q (2) (7) (3) (4) (1) (6) (5) 1. 2. 3. 4. Power switch installation position 1105Q 1104Q Connect the foot controller cable (1) and the motor cable (2) to the control box. Install the power switch (3) to the underside of the work table with the two screws (4). Clamp the foot controller cable (1) with the two cable clips (5) and then secure the cable clips (5) with the screws (6).
3.INSTALLATION < -02 > Right/left cloth presser No. Label No. of Right/left movable knife No. Specification harness (6) Thread handler No. (4) No. No. (7) (5) No.10 (2) (3) (1) Label No. L1 1 1 L2 2 2 L3 3 3 L4 4 4 L5 5 5 L6 6 6 L7 7 7 1113Q 1112Q Insert the harness (L1 - L7) (1) to connector No. 10 (9-pin).
3. INSTALLATION 3-11. Installing the air hoses Connect the air hose from the compressor to the air unit underneath the work table. 1. Turn the nut (1) at the end of the air hose, and then connect the hose to the valve (2). 2. Open the air cock (3) on the compressor. Check that there is no air leaking from the valve (3) connection. 3. Open the cock (3) by turning it in the direction of the arrow. Open The meter needle will move clockwise. (2) Closed 4.
3.INSTALLATION 3-12. Connecting the power cord CAUTION Contact your Brother dealer or a qualified electrician for any electrical work that may need to be done. 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. Do not connect the power cord until installation is complete, otherwise the machine may operate if the start switch is pressed by mistake, which could result in injury.
4. LUBRICATION 4. LUBRICATION CAUTION Turn off the power switch before starting lubricating, otherwise the machine may operate if the start switch is pressed 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 diarrhoea.
4.LUBRICATION Oiling the looper, spreader and race stand 1116Q (3) (6) (6) (4) (2) (10) (4) (A) (8) (5) (1) (9) (7) 1117Q 0862Q 1. 2. 3. 4. Turn the upper shaft pulley (1) toward you until the mark on the pulley (A) is aligned with the notch in the pulley cover (2). Move the feed bracket (3) toward you. Turn the left and right plate pressers (4) in the directions indicated by the arrows.
5. CORRECT USE 5. CORRECT USE 5-1. Initializing settings The following procedure should be carried out before the sewing machine is used for the first time, and also after long periods of non-use. If "E-59" appears on the front panel display when the power is turned on, be sure to follow this procedure to initialize all settings. ("E-59" will appear after a PROM has been replaced or after long periods of non-use. For details on the "E-59" message display, refer to page 27.) 1. Turn off the power. 2.
5. CORRECT USE 5-3. Checking the direction of machine operation 1124Q 0862Q (2) (A) (1) (4) (3) (6) (5) (8) (7) (9) 1122Q 1116Q (10) 1123Q 1. Turn the upper shaft pulley (1) toward you until the mark (A) on the pulley (1) is aligned with the notch in the cover (2). 2. Press the power switch (3) to turn on the power. The power indicator will illuminate and the TROUBLE indicator will flash. 3. Press the RESET button (4).
5. CORRECT USE 5-4. Installing the needle CAUTION Turn off the power switch before installing the needle, otherwise the machine may operate if the start switch is pressed by mistake, which could result in injury. 0872Q (2) (3) (1) (5) (4) 0871Q Use only Schmetz D0 x 558 Nm80 – Nm120 needles. 1. Raise the finger guard (1). 2. Loosen the screw (2), and then remove the needle (3). 3. Insert the new needle (3) as far as it will go so that the groove is facing toward you. 4. Securely tighten the screw (2).
5. CORRECT USE 5-6. Threading the lower thread Remove the cloth presser plates (refer to page 13), and then thread the lower thread as shown in the illustration below.
5. CORRECT USE 5-7. Threading the gimp Remove the cloth presser plates (refer to page 13), and then thread the gimp as shown in the illustration below. Once threading is complete, replace the cloth presser plates. 0885Q <-00, -01> 0884Q <-02> (1) Pass the gimp through the hole of the thread tension stud (1). Refer to “9-17. Adjusting the gimp length after trimming (-02)” (Page 54). 0886Q 5-8. Setting the material (1) (2) (1) (1) (2) 10 - 30 mm (2) (2) 0890Q 0889Q 1.
6. USING THE OPERATION PANEL AND FRONT PANEL 6. USING THE OPERATION PANEL AND FRONT PANEL 6-1.
6. USING THE OPERATION PANEL AND FRONT PANEL If the power is turned on and the RESET switch is then pressed, the feed bracket will move to the cloth setting position. Operations such as selecting a program number, changing the operation mode and selecting the cutting method can then be carried out. 6-2. Selecting a program number A maximum of nine different eyelet shapes can be programmed. 1. Press the PROGRAM NUMBER button (1). (Check which of the mode indicator illuminates.
6. USING THE OPERATION PANEL AND FRONT PANEL 6-5. Setting a program 1130Q (2) 1. Push the section on the front panel marked "PUSH" to open the front panel. 2. Press the MODE button (1) to switch to programming mode. Programming will not be possible unless the PROGRAM indicator is illuminated. * The SPEED indicator (A) will illuminate and the current sewing speed appear on the front panel display (J). 3.
6. USING THE OPERATION PANEL AND FRONT PANEL A.Setting the sewing speed 1134Q (K) (L) (N) 1135Q 1. The sewing speed can be set to between 1000 - 2000 rpm in 11 100-rpm steps. 2. Press the "Up" button (L) or the "Down" button (K) to set the desired sewing speed. * When the setting value is being changed, the numerals appearing in the display will flash. 3. Press the ENTER button (N) to accept the new sewing speed setting. * The display will stop flashing. B.
6. USING THE OPERATION PANEL AND FRONT PANEL D.Setting the tacking length 1. The tacking length can be set to between 3 and 43 mm in steps of 1 mm. 2. If not adding tacking, set the tacking length to "0". If this is done, it will not be possible to set a value for the offset. Note: You cannot set the tacking length to a value that would make the difference between the buttonhole length and the tacking length less than 7 mm. 3.
6. USING THE OPERATION PANEL AND FRONT PANEL G. Setting the number of eyelet stitches (K) (L) (N) 1146Q 1147Q 1. The number of eyelet stitches can be set to between 4 and 20 stitches in steps of 1 stitch. 2. Press the “Up” button (L) or the "Down" button (K) to set the desired number of eyelet stitches. * When the setting value is being changed, the numerals appearing in the display will flash. 3. Press the ENTER button (N) to accept the new eyelet stitch number setting.
6. USING THE OPERATION PANEL AND FRONT PANEL P1. Setting X correction (K) 1. The setting range is from 1 to 6 in steps of 1. * Set to a larger value if you would like to move the eyelet seam to the right (when seen from the finished side, or the reverse side when sewing). 2. Press the “up” button (L) or the “down” button (K) to set the X correction value. * When the setting value is changed, the value displayed will start to flash. 3. Press the ENTER button (N) to accept the X correction setting.
6. USING THE OPERATION PANEL AND FRONT PANEL P4. Setting θ 2 correction (K) (L) (N) 1158Q 1159Q 1. The setting range is from -3 to 3 in steps of 1. * Set to a larger value if you would like to rotate the eyelet seam clockwise (when seen from the finished side, or the reverse side when sewing). 2. Press the “up” button (L) or the “down” button (K) to set θ 2 correction value. * When the setting value is changed, the value displayed will start to flash. 3.
6. USING THE OPERATION PANEL AND FRONT PANEL 6-6. Using the memory switch The conditions of the memory switches are memorized even if the power is OFF, however, if data of the memory switches are initialized, the memory switches will be returned to their initial settings (factory default settings). (J) (K) (L) (M) (N) (1) 1160Q 1019Q 1. While pressing the SELECT button (M), press the power switch to turn on the power.
6. USING THE OPERATION PANEL AND FRONT PANEL No. 07 08 09 10 Contents Y direction offset for return seam to prevent thread breakage Sewing end pitch for buttonhole taper to prevent fraying No. of stitches before pitch change for memory switch No. 08 * Does not appear when memory switch No. 08 is set to OFF. No. of stitches after pitch change for memory switch No. 08 * Does not appear when memory switch No. 08 is set to OFF. 11 Test feeding speed 12 Speed for memory switch No.
6. USING THE OPERATION PANEL AND FRONT PANEL 6-7. List of error codes If the buzzer sounds and an error code starting with "E" appears in the front panel display, check according to the table below. Codes E-00 to E-16 are errors which are displayed when the power is turned on. Codes E-30 to E-59 are resetting errors which are displayed before operation and after the EMERGENCY STOP switch is pressed. Codes E-60 to E-89 represent errors which occur during operation.
7. SEWING 7. SEWING Make sure you know where the EMENRGENCY STOP switch is and how it is used before operating the sewing machine. 7-1. Using the EMERGENCY STOP switch (1) (2) (K) (L) (4) (3) 1161Q 1162Q 1163Q In automatic mode 1. Press the EMERGENCY STOP switch (1). * All machine operations will stop and the buzzer will sound. The TROUBLE indicator will illuminate and "E-60" will appear on the front panel display at this time. 2. Eliminate the cause of the problem.
7. SEWING 7-2. Sewing CAUTION Turn off the power switch at the following times, otherwise the machine may operate if the start switch is pressed by mistake, which could result in injury. When threading the needle When replacing the needle When not using the machine and when leaving the machine unattended 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.
7. SEWING 7-3. Adjusting the thread tension Turn off the power. Never adjust the thread tension while sewing. Woolen materials + wool gimps Denim (3 layers) Upper thread tension 0.9 N 1.0 N Lower thread tension 0.3 N 0.8 N Thread take-up spring tension 0.05 N 0.07N Thread take-up spring stroke 8 mm 8 mm Upper and lower thread # 30 polyester # 30 cotton * If you change the type of material being used, it may be necessary to change the thread tension.
7. SEWING 7-4. Needle and knife position The feed bracket is electronically controlled by means of pulse motors. It is not necessary to change the position of the knife when switching between cutting before sewing and cutting after sewing. It is not necessary to change the needle down position in order to keep enough space for cutting when cutting after sewing has been selected. Relationship between knife position and eyelet shape 0936Q Straight section Knife a 1.
7. SEWING Knife position compensation function 1166Q This function moves the knife with respect to the seam in order to ensure that distances a and a' are equal. a’ a Knife position compensation a’ 1. When cutting before sewing, the difference between a and a' will change depending on the cloth opening amount. 2. Set the knife position compensation value I so that the two are equal. (Move the knife to the positive direction (+) when increasing the cloth opening amount. Refer to "I.
7. SEWING 7-5. Using the production counter The production counter is initially set to the counting up from zero method. It can display up to a maximum count of 9999. * If DIP switch No. 4 inside the front panel is set to OFF, the counting up from zero method will be used. If DIP switch No. 4 is set to ON, the counting down to zero method will be used. Standard position (Counting up from zero method) Reset position (Counting down to zero method) 1168Q Displaying the production counter 1.
7. SEWING 7-6. Using a cycle program This example shows the procedure for a cycle program which runs program 1 (with the knife operating) three times and program 3 (with the knife not operating) once. 1173Q (2) (1) (J) 1174Q (L) (K) (N) 1175Q (1) 1177Q Programming procedure 1. Press the MODE button (1) to switch to programming mode. 2. Keep pressing the SELECT button (2) until " C " appears in the program number display window.
7. SEWING 7-7. Setting the feed bracket to the front position Setting the material will be easier if the feed bracket is moved forward from the standard cloth setting position. * Cycle time will be reduced with this setting, particularly if cutting after sewing is selected. 1. 2. 3. 4. 5. 6. 1178Q Turn off the power. Set DIP switch No. 3 inside the front panel. Turn on the power. Press the RESET button (1). The feed bracket will move to the front position. Sewing can then be carried out as normal.
7. SEWING 7-9. Using feed mode In this mode, the feed bracket and the cloth presser can be moved while the needle is stopped. It is useful for checking the relative positions of the throat plate and the cloth presser. (5) (J) (K) (6) (4) (L) (2) (1) (3) 1182Q 1183Q 1. Press the MODE button (1) to switch to feed mode. * "FEEd" will appear in the front panel display (J). 2. Press the cloth presser switch (2). The cloth pressers will be lowered. 3. Press the start switch (3).
7. SEWING 7-10. Using manual mode In this mode, the needle and the feed bracket can be moved one stitch at a time by turning the upper shaft pulley by hand. It is useful for checking the positions of the needle and the looper after the looper timing has been adjusted. (6) (4) (5) (J) (7) (1) (2) (3) 0783Q 0784Q 0785Q 1. Press the MODE button (1) to switch to manual mode. * “H” will appear in the front panel display (J). ( represents the number of stitches remaining.) 2.
7. SEWING 7-11. Changing the cycle program counter The cycle program counter can be easily changed if necessary, for instance because re-sewing was necessary. 1185Q (J) (K) (L) 1. If carrying out cycle sewing in AUTO mode, switch the contents shown in the front panel display from the production counter to the cycle program. The program number which is to be sewn next will flash in the display.
7. SEWING 3. Press the "up" button (L) or the "down" button (K) until the desired number of home position cycles is displayed. The setting range is between 0 and 9. * If the number of home position cycles is set to "5", returning to the home position will occur once for every five cycles. However, when carrying out cycle sewing, the machine will return to the home position once for each cycle program regardless of the number of home position cycles which have been set (unless the setting is "0").
8. CLEANING AND MAINTENANCE 8. CLEANING AND MAINTENANCE CAUTION Turn off the power switch before starting any cleaning work, otherwise the machine may operate if the start switch is pressed 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.
9. STANDARD ADJUSTMENTS 9. STANDARD ADJUSTMENTS CAUTION 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 start switch is pressed by mistake, which could result in injury.
9. STANDARD ADJUSTMENTS 9-2. Adjusting the needle and looper timing The distance by which the needle bar rises from its lowest position to the position where the tip of the left looper and the center of the needle are aligned should be the same as the distance from its lowest position to the position where the tip of the right looper and the center of the needle are aligned. Before adjusting the looper timing, first adjust the stitch width (needle racking width).
9. STANDARD ADJUSTMENTS 9-3. Adjusting the loop stroke The loop stroke is the distance the needle bar rises from its lowest position to the position where the tips of the left and right loopers are aligned with the center of the needle. The standard loop stroke is 2.7 mm. (The loop stroke may need changing depending on the material and thread being used.) * Carry out the adjustment in "9-2. Adjusting the needle and looper timing" before making this adjustment. (1) 2.7 mm (2) (B) (A) 0956Q 1.
9. STANDARD ADJUSTMENTS 9-4. Adjusting the height of the needle bar The standard height for the needle bar is 2.5 mm. (The needle bar height may need changing depending on the material and thread being used.) (4) (2) (5) (3) (1) 2.5 mm 2.5 mm (6) 0959Q 0961Q 0960Q 1. Align the tip of the left looper (1) with the center of the needle (2) when the needle (2) is at the inside sewing position. 2. Remove the face plate. 3.
9. STANDARD ADJUSTMENTS 9-6. Adjusting the needle guard Be sure to carry out this adjustment after changing the size of the needle. The needle must remain stationary with respect to the needle guard until the tip of the looper reaches the needle. 1. Loosen the screw (1) and then move the needle guard (3) in the directions indicated by the arrows by an appropriate amount in accordance with the thickness of the needle (2). Note: Adjust so that the looper clasps the upper thread securely.
9. STANDARD ADJUSTMENTS 9-8. Adjusting the spreader timing When the needle is at the inside sewing position, the left spreader should touch the left spreader stopper and stop immediately before the needle bar reaches its lowest position. When the needle is at the outside sewing position, the right stopper should touch the right spreader stopper and stop immediately before the needle bar reaches its lowest position. 1. Raise the machine head. 2.
9. STANDARD ADJUSTMENTS 9-10.Changing the knife cutting length (Replacing the cutting block) Illustration (A) (1) (3) (2) 0970Q 0969Q 1. Grind or replace the cutting block after changing the knife cutting length. * When replacing the cutting block with a new one, be sure to adjust the contact between the knife and the cutting block. (Refer to the next page.) 2. Loosen the screw (1), and then remove the cutting block (2).
9. STANDARD ADJUSTMENTS 9-11. Adjusting the contact between the knife and the cutting block 0971Q 1. Knife incision 2. Knife incision is correct is too deep 3. Two knife incisions 4. Partial knife incision 19 mm 3 mm 0972Q 1. Remove the cutting block. (Refer to the previous page.) 2.
9. STANDARD ADJUSTMENTS 9-12. Replacing the knife When replacing the knife with a new one, file the surface of the cutting block until smooth and until the knife does not leave a mark on the cutting block. Before replacing the knife, be sure to check that there is no gap between the knife (1) and the knife stopper (2). (1) (2) (L 1 - L 4) (3) 0974Q 0973Q 1. Loosen the screw (3), and then remove the knife (1). 2.
9. STANDARD ADJUSTMENTS 9-14. Adjusting the cloth opening amount (1) (1) (2) (2) 0977Q 0976Q 1. Loosen the screw (1), and then insert a screwdriver into the notch in the side of the feed bracket and turn the adjusting screw (2) to adjust the opening amount. 2. After tightening the screw (1), measure the opening amount. Note: Adjust so that the opening amounts for the left and right cloth presser plates are equal. * It is usually sufficient for one cloth presser plate to open by 0.8 mm.
9. STANDARD ADJUSTMENTS 9-15. Adjusting the trimming of the upper thread The upper thread should be trimmed at the correct time after sewing is completed. <-00, -01> 1. Adjust so that the upper thread trimmer knife (1) cuts only one of the threads in front of the right looper (2). Note: If both strands of the thread loop are cut, the thread remaining in the needle may become too short and skipped stitches may result. (1) (2) 0980Q <-02> 1.
9. STANDARD ADJUSTMENTS <-02> The lower thread and gimp should be trimmed at the correct time after the cloth pressers rise at the feed home position. Thread trimming operation can be checked in steps while manual mode is active. (Refer to “Using manual mode” on page 39.) 1. The mechanism is adjusted so that the lower thread and gimp are spread by the thread handler (1). 2. The movable knife driving cam (2) operates, and the right movable knife (3) and left movable knife (4) mesh (1) and the thread is cut.
9. STANDARD ADJUSTMENTS 9-18. Lower thread presser (-02) The lower thread presser (1) operates at the same time as upper thread trimming is carried out. The end of the lower thread is securely held between the lower thread presser (1) and the throat plate (2). (2) (1) 0986Q 9-19. Sub presser (-02) Trimming of the lower thread and gimp is carried out when the cloth pressers rise.
10. SUMMARY OF DIP SWITCHES 10. SUMMARY OF DIP SWITCHES Always turn off the power supply before changing any of the DIP switch settings. 10-1. Front panel DIP switches The ON/OFF positions of the DIP switches inside the front panel are checked only once when the power is turned on. Any changes to the DIP switch positions will not be effective until the power is switched off and back on again. No.
10. SUMMARY OF DIP SWITCHES 10-2. Circuit board DIP switches 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. The ON/OFF positions of the DIP switches inside the front panel are checked only once when the power is turned on.
11. TROUBLESHOOTING 11. TROUBLESHOOTING If there is a problem with operation, first check that the threads are correctly threaded and that the needle is correctly installed. CAUTION Turn off the power switch and disconnect the power cord before carrying out troubleshooting, otherwise the machine will operate if the start switch is pressed by mistake, which could result in injury. MACHINE HEAD Problem Thread breaks. Cause Thread tension control pressure is too strong.
11. TROUBLESHOOTING Problem Upper thread is not cut. Lower thread is not cut. Cause Remedy Knife is blunt. Replace with a new knife. Page 51 Knife does not move to the full stroke because air pressure is too Adjust the air pressure. weak. 51 Install the upper thread trimmer Upper thread trimmer knife is not knife so that it cuts only one side picking up the upper thread. of the upper thread loop.
INSTRUCTION MANUAL BROTHER INDUSTRIES, LTD. 15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone: 81-52-824-2177 Printed in Japan 118-980 S91980-302 2001.11.
