Brother BAS-311H Service Manual
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Brother BAS-311H Service Manual

Programmable electronic pattern sewer
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BAS-311H
SERVICE MANUAL
Please read this manual before making any adjustments.
DIRECT DRIVE
PROGRAMMABLE ELECTRONIC PATTERN SEWER

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Table of Contents

Troubleshooting

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Summary of Contents for Brother BAS-311H

  • Page 1 BAS-311H SERVICE MANUAL Please read this manual before making any adjustments. DIRECT DRIVE PROGRAMMABLE ELECTRONIC PATTERN SEWER...
  • Page 2 This service manual is intended for BAS-311H; be sure to read the BAS-311H instruction manual before this manual. Carefully read the “SAFETY INSTRUCTIONS” below and the whole of this manual to understand this product before you start maintenance. As a result of research and improvements regarding this product, some details of this manual may not be the same as those for the product you purchased.
  • Page 3 The symbol ( ) indicates something that you must not do. ………………… The symbol (●) indicates something that you must do. The picture inside the circle indicates the nature of the thing that must be done. (For example, the symbol at left means “you must make the ground connection”.) BAS-311H...
  • Page 4 Furthermore, do not excessively bend the cords or secure them too firmly Contact your Brother dealer or a qualified electrician with staples, otherwise there is the danger that fire or for any electrical work that may need to be done.
  • Page 5 Furthermore, do not apply excessive force when Ask your Brother dealer or a qualified electrician to tilting back the machine head. The sewing machine carry out any maintenance and inspection of the may become unbalanced and fall down, and serious electrical system.
  • Page 6 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. *安全保護装置：...
  • Page 7 Rear cover Tension release solenoid cover Inner cover L Outer cover Fixed cover Side cover Thread take-up cover Eye guard Inner cover R Outer cover Fixed cover Finger guard Gas spring support cover 3228B 3029B BAS-311H...

  • Page 8: Table Of Contents

    7-13. Thread wiper mechanism························ 82 an SD card ·············································· 46 7-14. Auxiliary plate·········································· 83 5-12. [ w 9] Writing error log data and memory switch log data to an SD card ················· 47 7-15. Covers····················································· 84 5-13. Updating the control program version····· 48 BAS-311H...
  • Page 9 8-22-1. Work clamp lift home position ········102 8-22-2. X-Y feed home position ··················105 8-23. Adjusting the motor standard position ···108 8-24. Adjusting the needle up stop position····109 8-25. Setting method for standard depression strokes (Foot switch) ·····························110 9. APPLYING GREASE (FEED MECHANISM) ························ 111 BAS-311H...

  • Page 10: Specifications

    Air pressure 0.5 MPa 1.8 l/min. (*1) The number of data items and stitches that can be stored will vary depending on the number of stitches in each program. (*2) No guarantees of operation can be given for any media. BAS-311H...

  • Page 11: Notes On Handling

    * While supporting the arm with both hands, gently lower it. 3244B Returning the machine head to the upright position 1. Pack away any tools which are near the table. 2. While supporting the arm with both hands, gently return the machine head to its original position. 3245B BAS-311H...

  • Page 12: Function Settings

    Refer to “3-7. Input checking method”. Refer to “8-22. Adjusting the home position”. Output check function 2598B Treadle position adjustment mode 2602B Refer to “ 8 - 25. Setting method for standard Refer to “3-8. Output checking method”. depression strokes (Foot switch)”. BAS-311H...
  • Page 13 Refer to “3-10. Protection settings”. Refer to “8-23. Adjusting the motor standard position”. Version update Needle up stop position adjustment mode 2606B 3194B Refer to “5-13. Updating the control program version”. Refer to “8-24. Adjusting the needle up stop position” BAS-311H...

  • Page 14: List Of Advanced Functions

    Refer to the CD Instruction Manual. patterns”. Production counter setting mode 2610B SD data read/write mode 2615B Refer to the CD Instruction Manual. Refer to “5-3. Preparation for reading and writing data”. Program mode 2611B Refer to the CD Instruction Manual. BAS-311H...

  • Page 15: Setting Memory Switches (Advanced)

    Repeat steps 2 to 4 above to set each memory switch. Exit setting mode Press the TEST key. ･ The changes will be memorized and the sewing machine will switch to home position detection standby. 2404B TEST indicator switches off BAS-311H...

  • Page 16: List Of Memory Switches

    Parameters can be set separately for each program. Unit display for pattern zoom ratio Displayed as % ON/OFF None Displayed as mm Split mode selection Continuous split mode None Single split mode Cycle program No. (C01 to C30) display ON/OFF Disabled (Skipped) None Enabled BAS-311H...
  • Page 17 If it is set to "ON" when no programs have been registered, nothing is displayed (the display is skipped). *2: If an F key which does not have a program registered to it is pressed, the key will be invalid. (The buzzer will sound twice.) BAS-311H...
  • Page 18 Thread winding is not possible during intermittent lifting and before work clamp home position detection is carried out (such as when the work clamp switch has not been depressed at all after the power was turned on), even when memory switch No. 056 is set to "ON". BAS-311H...
  • Page 19 The left and right order can be changed using memory switch No. 002. [Work clamp drops and sewing starts only when work clamp switch is depressed] Work clamp drops and sewing starts only by depressing the work None clamp switch. Starting sewing is also possible by using the start switch. BAS-311H...
  • Page 20 The right pedal (center) is used exclusively for detecting the home position. The left work clamp only is raised and lowered when the left pedal is Pneumatic depressed. The start switch (right) lowers the right work clamp and starts the sewing machine. BAS-311H...
  • Page 21 The maximum values are limited for all speed setting values which have been 2800 None 2800 programmed. Units (sti./min), Increments of 100 Thread trimming disabled Thread trimming is carried out in accordance with the sewing data. ON/OFF None Thread trimming is not carried out. BAS-311H...
  • Page 22 If the needle bar is not at the needle up stop position during feeding or work clamp home position detection, it moves automatically to the needle up stop position. *1: Only enabled when memory switch No. 100 is set to "OFF". BAS-311H...
  • Page 23 Changes the overall feed timing (-80 Early ←→80: Late) -80-80 None Units (degree), Increments of 1 *1: Only enabled when memory switch No. 200 is set to "OFF". *2: The start switch is disabled. Cannot be set when memory switch No.650 is set to "2". BAS-311H...
  • Page 24 Moves to sewing start position after home position detection when start switch is depressed, and then stops. Home position detection is not carried out. If the program has changed, moves to the next sewing start position and then stops. BAS-311H...
  • Page 25 1 − 31. Switches split numbers using an external switch Disable Split number is switched by means of the 5 bits of option input ON/OFF None (EXIN6 − EXIN10). Applicable numbers are 1 − 31 (only enabled for independent split mode). BAS-311H...
  • Page 26 (Parallel movement mode cannot be used.) Select "1" or "2" when memory switch No. 400 is set to "OFF". Retract point switching at parallel movement point Disable ON/OFF None The position moved to by parallel movement is recorded as the retract point. BAS-311H...
  • Page 27 When this device is used, memory switch No. 002 should be set to "0". Pneumatic Disable Standard automatic ejector operation occurs. Sewing starts when cassette sensor is ON. Start switch is enabled even if cassette sensor is OFF. BAS-311H...
  • Page 28 None Units (×10 ms), Increments of 1 Wait time for lower thread detection response 1-99 None Units (×10 ms), Increments of 1 Output time for lower thread detection operation command signal 1-99 None Units (×10 ms), Increments of 1 BAS-311H...
  • Page 29 None Mechanism steps back to the sewing start position along the sewing path without moving to the home position. Time from error occurring to buzzer stopping 0-30 Buzzer does not stop. None 2-30 Units (s), Increments of 2 BAS-311H...
  • Page 30 Not raised and lowered when memory switch No. 001 is set to "OFF". Run-in operation stop time 0-3000 None Units (ms), Increments of 10 Sewing machine ID code (Sewing data specified on SD card) 0-99 None Folder specified BAS-311H...
  • Page 31 Settings Setting details range value limits Program number output Disable ON/OFF None When the last two digits of the program number are 1 to 15, the program number is output in 4 bits to option output 4 − 7. BAS-311H...

  • Page 32: Setting The Work Clamp Mode

    After sewing start operation clamp lifting position detection Automatic lift Automatic lift Lowered Work clamp Enabled dropping in 1 step Automatic lift Lowered Lowered Automatic lift Automatic lift Work clamp Lowered dropping in 2 Enabled Automatic lift steps Lowered Lowered BAS-311H...
  • Page 33 Work clamp switch sequence selection lift Lowered 0 : Left and right Left (right) work clamp → simultaneously Right (left) work clamp → Automatic 1 : Left → Right Both work clamps lift lift Lowered 2 : Right → Left Lowered BAS-311H...

  • Page 34: Error History Checking Method

    The production counter when the error occurred will appear in the PROGRAM No. display (2) and the menu display (3) in units of 100 stitches while the ▲ key (6) is being pressed. 3. Press the TEST key (5) to return to the normal display. The sewing machine will switch to home position detection standby. BAS-311H...

  • Page 35: Input Checking Method

    Back = ON, Forward = OFF Y-feed motor encoder counter value Move the work clamp manually in the Y direction. ［ 4］ ［-999］-［ 999］ ［EnY］ Back = down, Forward = up When the power is turned on, the position will be “0”. BAS-311H...
  • Page 36 Work clamp switch 2nd step for two-pedal foot switch ［ 14］ ［ on］/［ oFF］ ［CL2］ Depress the work clamp switch to the 2nd step. Start switch for two-pedal foot switch ［ 15］ ［ on］/［ oFF］ ［Stt］ Depress the start switch. BAS-311H...
  • Page 37 Option input (IN7) ［ 29］ ［ on］/［ oFF］ ［in8］ Option input (IN8) ［ 30］ ［ on］/［ oFF］ ［in9］ Option input (IN9) ［ 31］ ［i10］ ［ on］/［ oFF］ Option input (IN10) ［ 32］ ［ on］/［ oFF］ ［i12］ Option input (IN12) BAS-311H...

  • Page 38: Output Checking Method

    (for motor-driven type). ［ 53］ ［PM－F］ When the ▲ key is pressed, only the intermittent presser foot is raised (pneumatic type). When the ▼ key is pressed, only the intermittent presser foot is lowered (pneumatic type). ［ 54］ Not used BAS-311H...
  • Page 39 Option output 18 turns ON. ［ 77］ ［oP19］ Option output 19 turns ON. ［ 78］ ［oP20］ Option output 20 turns ON. Applies for pneumatic work clamp specifications when corresponding devices are installed. Can be determined automatically using a connector shorting pin. BAS-311H...

  • Page 40: Confirming Software Version

    ［1.00 ］ ［4.in］ Main IPL ［1.00 ］ Motor IPL ［5.it］ ［1.00 ］ Panel IPL ［6.iL］ ［1.00 ］ 3. Press the TEST key (5) to return to the normal display. The sewing machine will switch to home position detection standby. BAS-311H...

  • Page 41: Protection Settings

    9. Repeat steps 6 to 8 above for each item, and then press the TEST key (2). The protect setting mode will be exited and the sewing machine will change to home position standby. If you would like to return to protection level setting (2 above), press the F1 key (8). BAS-311H...
  • Page 42 Protect setting mode can only be started using Method B. 3. Press the ENTER key (3) to store the starting method. 4. For the method of operation from this point onward, refer to steps 2 to 9 in “Method A” (previous page). BAS-311H...
  • Page 43 Sewing start after pause × Parallel movement mode × × × × × × Program copy mode The standard setting is that the tension settings during pattern editing and wait are not displayed because of to the digital tension option. BAS-311H...

  • Page 44: And Y Parallel Movement Of Sewing Patterns

    100 - : Increments of 1 mm 3205B Confirm the movement amount Press the ENTER key. ･ The amount of parallel movement in the horizontal direction will be confirmed, and the menu display will change to illuminated. 2414B (Continued on next page) BAS-311H...
  • Page 45 No. 465 is set to “2” or “3”, the movement amount will remain stored and will not be reset. ･ If memory switch No. 465 is set to “3”, the movement amount can be set for each program using parameters. The “Movement amount setting” parameter selection comes in between “Sewing speed” and “Counter”. BAS-311H...

  • Page 46: Using Sd Card

    SD card, change the folder name. Memory switch Same as above ISMMSW.SEW Parameter Same as above ISMUPG.SEW Cycle program Same as above ISMCYC.SEW Error log ¥BROTHER¥ISM¥ISMLDT¥ Stores the files which relate to error logs. BAS-311H...

  • Page 47: Preparation For Reading And Writing Data

    SD card. [LoG-] Error log data is written to the SD card. *1: The additional sewing data that can be used with this sewing machine is data which has been created for the BAS-311H. BAS-311H...

  • Page 48: R 1] Reading Additional Sewing Data

    △ or ▽ key to select the mode and then run it. 3101B Exit read/write mode Press the TEST key. TEST indicator switches off 2404B Contact the place of purchase for information on other reading and writing modes. BAS-311H...

  • Page 49: W 2] Writing Additional Sewing Data To

    ･ If you would like to use any other read/write modes, press the △ or ▽ key to select the mode and then run it. 2659B Exit read/write mode Press the TEST key. TEST indicator switches off 2404B BAS-311H...

  • Page 50: R 3] Reading Memory Switch Data

    ･ If you would like to use any other read/write modes, press the △ or ▽ key to select the mode and then run it. 2661B Exit read/write mode Press the TEST key. TEST indicator switches off 2404B BAS-311H...

  • Page 51: W 4] Writing Memory Switch Data To The Sd Card

    ･ If you would like to use any other read/write modes, press the △ or ▽ key to select the mode and then run it. 2664B Exit read/write mode Press the TEST key. TEST indicator switches off 2404B BAS-311H...

  • Page 52: R 5] Reading Program Data

    ･ If you would like to use any other read/write modes, press the △ or ▽ key to select the mode and then run it. 2665B Exit read/write mode Press the TEST key. TEST indicator switches off 2404B BAS-311H...

  • Page 53: W 6] Writing Program Data To An Sd

    ･ If you would like to use any other read/write modes, press the △ or ▽ key to select the mode and then run it. 2666B Exit read/write mode Press the TEST key. TEST indicator switches off 2404B BAS-311H...

  • Page 54: R 7] Reading Sewing Machine Data

    ･ If you would like to use any other read/write modes, press the △ or ▽ key to select the mode and then run it. 2669B Exit read/write mode Press the TEST key. TEST indicator switches off 2404B BAS-311H...

  • Page 55: W 8] Writing Sewing Machine Data To

    ･ If you would like to use any other read/write modes, press the △ or ▽ key to select the mode and then run it. 2671B Exit read/write mode Press the TEST key TEST indicator switches off 2404B BAS-311H...

  • Page 56: W 9] Writing Error Log Data And Memory

    ･ If you would like to use any other read/write modes, press the △ or ▽ key to select the mode and then run it. 2673B Exit read/write mode Press the TEST key TEST indicator switches off 2404B BAS-311H...

  • Page 57: Updating The Control Program Version

    When “End” appears in the menu display, updating is tension display will increment complete. while the program version is being ･ To continue updating another program, return to step updated. 5 and select the next program to be updated. 2680B 2681B Turn off the power switch. BAS-311H...

  • Page 58: Mechanical Descriptions

    6. Needle bar clamp <6>Thread take-up 7. Needle bar support 6-2. Lower shaft and shuttle race mechanisms 3247B 1. Motor assembly 2. Upper shaft 3. Crank rod assembly 4. Rock gear 5. Lower gear 6. Lower shaft 7. Driver 8. Shuttle hook BAS-311H...

  • Page 59: Work Clamp Lifter Mechanism

    6. Work clamp lifter link 7. Work clamp lifter lever 8. Work clamp lifter plate assembly 3248B 9. Slider 10. Work clamp lifter lever 11. Connecting rod 12. Connecting link 3249B 13. Work clamp lifter lever 14. Work clamp BAS-311H...

  • Page 60: Work Clamp Lifter Mechanism

    4. Stepping foot driving lever 5. Stepping clamp lifter rod 3251B 6. Stepping clamp lifter 7. Stepping clamp lifter link 8. Stepping clamp link 9. Stepping clamp connecting rod B 10. Presser bar clamp 11. Presser bar 12. Presser foot BAS-311H...

  • Page 61: Intermittent Presser Foot Stroke

    4. Stepping clamp connecting rod 5. Stepping clamp arm R 6. Stepping clamp arm F 7. Stepping clamp connecting rod A 8. Stepping clamp link 9. Stepping clamp connecting rod B 10. Presser bar clamp 11. Presser bar 12. Presser foot BAS-311H...

  • Page 62: Feed Mechanism

    5. Timing pulley 6. Timing belt 7. X-feed bracket assembly Y direction 1. Y-feed motor assembly 2. Gear 3. Y-feed rack shaft assembly 3254B 4. X-feed shaft support 5. X-feed shaft 6. Work clamp arm assembly 7. Y-feed bracket BAS-311H...

  • Page 63: Thread Trimmer Mechanism

    13. Movable knife connecting plate 4. Driving lever 14. Movable knife 5. Thread trimmer collar 15. Fixed knife 6. Thread trimmer cam 7. Thread trimmer rod V 8. Thread trimmer lever 9. Thread trimmer rod H 10. Movable knife lever BAS-311H...

  • Page 64: Tension Release Mechanism

    6-9. Tension release mechanism 1. Tension release solenoid 2. Bolt 3. Tension release bar 3320B 4. Tension release pin 6-10. Thread wiper mechanism 3345B 1. Thread wiper solenoid assembly 2. Thread wiper rod 3. Thread wiper crank assembly 4. Wiper BAS-311H...

  • Page 65: Assembly

    Apply adhesive (Threebond 1401N or similar) to the thread Thread take-up crank section of the screw (6). Screw Set screw Set screws [2 pcs.] Set screws [2 pcs.] 10. Rubber cap 11. Set screws [2 pcs.] 12. Joint assembly 13. Set screws [2 pcs.] BAS-311H...
  • Page 66 16. Set screws [2 pcs.] 17. Thread trimmer cam Apply the specified grease unit (SB1275-101) to the grooves. 18. Set screw 19. Set screw 20. Set screws [2 pcs.] 21. Set screws [2 pcs.] (Temporarily tighten) 22. Pulley assembly 3284B BAS-311H...

  • Page 67: Needle Bar Mechanism

    7. ASSEMBLY 7-2. Needle bar mechanism Apply grease <Grease unit (SB1275-101)> specified by Brother to the portions indicated by the white arrows. Set so that this hole faces upward, and then push in gently while tightening the set screws (14) to install.
  • Page 68 (19) from its lowest position, and then set the cut section so that it is facing forward and tighten the screw. 4647Q BAS-311H...

  • Page 69: Intermittent Presser Foot Lifter

    7. ASSEMBLY 7-3. Intermittent presser foot lifter mechanism Apply grease <Grease unit (SB1275-101)> specified by Brother to the portions indicated by the white arrows. Tighten the set screw (5) on the screw stop while lightly pressing the stepping clamp lifter 3325B <Stepping clamp lifter rod adjustment>...
  • Page 70 25. Adjusting screw nut 26. Presser adjusting screw 27. Presser foot 28. Plain washers [2 pcs.] Tighten the set screw (17) on the screw stop 29. Finger guard while lightly pressing the link shaft (16). 30. Screw (Temporarily tighten) 3373B BAS-311H...

  • Page 71: Work Clamp Lifter Mechanism

    7. ASSEMBLY 7-4. Work clamp lifter mechanism (Motor-driven work clamp specifications) Apply grease <Grease unit (SB1275-101)> specified by Brother to the portions indicated by the white arrows. 3327B Ball bearings [2 pcs.] Work clamp cam Work clamp cam gear Work clamp fulcrum shaft...
  • Page 72 B (24) through the work clamp lifter lever (23). NOTE: When the work clamp lifter plate assembly (21) is lowered, the slide block (22) moves away, so hold the work clamp lifter plate assembly (21) in place until the link shoulder screw (28) is tightened. 3328B BAS-311H...
  • Page 73 3) Align the index marks on the work clamp cam gear (3) and the work clamp driving gear (31), and then install the work clamp motor plate (33) with the two bolts (35) so that the backlash is 0.01 – 0.05 mm. BAS-311H...

  • Page 74: Work Clamp Lifter Mechanism

    7. ASSEMBLY 7-5. Work clamp lifter mechanism (pneumatic work clamp specifications) Apply grease <Grease unit (SB1275-101)> specified by Brother to the portions indicated by the white arrows. Set the work clamp cam gear (2) so that there is no clearance between it and the two ball bearings (1) in the...
  • Page 75 3) Align the index marks on the work clamp cam gear (2) and the work clamp driving gear (17), and then install the work clamp motor plate (19) with the two bolts (21) so that the backlash is 0.01 – 0.05 mm. BAS-311H...

  • Page 76: Feed Mechanism

    7. ASSEMBLY 7-6. Feed mechanism Apply grease <Grease unit (SB1275-101)> specified by Brother to the portions indicated by the white arrows. Apply adhesive (Threebond 1324N or similar) to the outer bearing surface of While pushing in the direction of the the ball bearing (1).
  • Page 77 (10). X-pulley bracket 10. Ball bearings [2 pcs.] 11. Timing pulley 12. X-pulley fulcrum shaft 13. Set screws [4 pcs.] 14. Bolts with washer [4 pcs.] 3271B After installing, carry out the adjustments in "8-19. Belt tension adjustment". BAS-311H...
  • Page 78 20. Y-feed guide 21. Set screws [3 pcs.] 45° 22. Bolts [5 pcs.] 23. Set screws [3 pcs.] 24. Y-feed guide covers [2 pcs.] 25. Flat screws [8 pcs.] 3419B 26. Ball bushings [4 pcs.] 27. Retaining rings C [8 pcs.] BAS-311H...
  • Page 79 30. Set screws [4 pcs.] 31. Belt work clamp plate 32. Screws [4 pcs.] Engage. 3272B 3374B 33. X-feed motor L assembly 34. Bolts with washer [3 pcs.] Install so that the backlash is 0.01 – 0.05 mm. 3273B BAS-311H...
  • Page 80 35. Y-rack shaft assembly 3274B 36. Bolts with washer [2 pcs.] (Temporarily tighten) 37. X-feed shaft support Install so that the backlash is 0.01 – 0.05 mm. 38. Y-feed motor L assembly 3275B 39. Bolts with washer [3 pcs.] BAS-311H...

  • Page 81: Work Clamp Arm Mechanism

    After installing, carry out test feeding and check that the needle hole is inside the work clamp arm assembly (3) and the feed plate (1) frame. If the needle hole is not inside the frame, adjust the position of the work clamp arm assembly (3) and feed plate (1). BAS-311H...

  • Page 82: Feed Covers

    Spring washers [4 pcs.] Nuts [4 pcs.] Outside covers [2 pcs.] (Place into cover rail) Inside cover R assembly 10. Inside cover L assembly 11. Screws 4X8 [4 pcs.] 12. Bellow assembly 13. Plain washers [4 pcs.] 14. Screws [4 pcs.] 3278B BAS-311H...

  • Page 83: Lower Shaft Mechanism

    7. ASSEMBLY 7-9. Lower shaft mechanism Apply grease <Grease unit (SB1275-101)> specified by Brother to the portions indicated by the white arrows. Tighten the set screw (2) until the head of the screw is flush with the edge of the bed. (Refer to “8-9.
  • Page 84 14. Driver 15. Bolt (Temporarily tighten) 16. Crank rod [Lower part] (Insert into upper shaft crank) 17. Needle bearing 18. Crank rod [Upper part] (Align the mating mark) 19. Bolts [2 pcs.] 20. Crank cover 21. Screws [3 pcs.] 3282B BAS-311H...

  • Page 85: Shuttle Hook Mechanism

    After installing the shuttle hook (4), carry out the adjustments in “8-6. Adjusting 3. Set screw the timing and the driver needle guard” and “8-7. Adjusting the needle 4. Shuttle hook clearance”. 5. Shuttle race base 6. Shuttle race base setting claw (Close) 7. Bobbin 8. Bobbin case BAS-311H...

  • Page 86: Thread Trimmer Mechanism

    7. ASSEMBLY 7-11. Thread trimmer mechanism Apply grease <Grease unit (SB1275-101)> specified by Brother to the portions indicated by the white arrows. When the ball joint assembly of thread trimmer rod assembly H (2) has been disassembled, assemble it so that the distance between the centers of the holes is 315.5 ±...
  • Page 87 28. Cushion 43. Nut 29. Set screw 44. Movable knife connecting plate 30. Thread trimmer solenoid 45. Shoulder screw Ball joint 258.5±0.5mm assembly 31. Solenoid setting plate 46. Shoulder screw B 32. Plain washers [2 pcs.] 47. Nut 3268B BAS-311H...
  • Page 88 (56) with the screws (57) and the flat screws (58) so that the 54. Thrust washer needle drops into the center of the needle hole. 55. Movable knife shoulder screw 56. Needle plate 57. Screws [2 pcs.] 58. Flat screws [2 pcs.] 59. Movable knife connecting plate BAS-311H...
  • Page 89 6. Set the needle bar to the timing position. 7. Loosen the nut (69) and turn the bolt (70) to set the height of the presser foot (66) to 0.5 mm above the needle plate. BAS-311H...

  • Page 90: Tension Release Mechanism

    10. Bolt 11. Plain washers [2 pcs.] 12. Spring washers [2 pcs.] 13. Bolts [2 pcs.] 14. Screws [2 pcs.] 15. Solenoid cover 16. Screws [2 pcs.] 17. Tension release pin 18. Tension bracket assembly 19. Set screw 3326B BAS-311H...

  • Page 91: Thread Wiper Mechanism

    Align the thread wiper shaft bracket and the bottom of the arm and then tighten the two bolts with washer (2). 3341B 1. Thread wiper unit 2. Bolts with washer [2 pcs.] 3. Plain washer 4. Bolt 5. STOP switch harness 6. Thread wiper solenoid harness BAS-311H...

  • Page 92: Auxiliary Plate

    Auxiliary plate brackets R Needle plate Bolts with washer [4 pcs.] Auxiliary plate 3337B Auxiliary plate cushions [8 pcs.] 10. Screws [8 pcs.] 11. Nuts [8 pcs.] After installing, carry out the adjustments in "8-22-2. X-Y feed home position ". BAS-311H...

  • Page 93: Covers

    Shuttle race cover assembly Side cover Screws [2 pcs.] Screws [4 pcs.] Face plate assembly 10. Rear cover Screws [3 pcs.] 11. Screws [4 pcs.] Eye guard assembly 12. Top cover Plain washers [2 pcs.] 13. Screws [6 pcs.] Screws [2 pcs.] BAS-311H...

  • Page 94: Adjustment

    Furthermore, after tilting back the machine head, do Ask your Brother dealer or a qualified electrician to not push the face plate side or the pulley side from carry out any maintenance and inspection of the above, as this may cause the machine head to electrical system.

  • Page 95: Standard Thread Tension

    0.1 − 0.3 0.1 − 0.6 0.3 − 0.6 Needle DP x 5 #16 DP x 17 #19 DP x 17 #25 Normal sewing speed 2,000 sti./min 2,000 sti./min 1,300 sti./min 8-2-1. Upper and lower thread tension 3317B 3318B BAS-311H...

  • Page 96: Thread Take-Up Spring

    When sewing heavy material, move arm thread guide R (1) to the left. (The thread take-up amount will become greater.) When sewing light material, move arm thread guide R Index mark (1) to the right. (The thread take-up amount will become less.) 3123B BAS-311H...

  • Page 97: Adjusting The Needle Bar Height

    (4) back and forth so that it is touching the needle. Then tighten the bolt (3). NOTE: If the driver (4) crosses the needle more than necessary, it will cause problems with the thread tension. Furthermore, if it does not cross the needle, skipped stitches or needle breakages may occur. BAS-311H...

  • Page 98: Adjusting The Needle Clearance

    ･ If the set screw (1) is turned clockwise, the lubrication amount becomes smaller. More oil ･ If the set screw (1) is turned counterclockwise, the Less oil lubrication amount becomes greater. Aligned 3127B BAS-311H...

  • Page 99: Adjusting The Thread Trimmer Cam

    6. With the collar (3) inserted into the groove of the thread trimmer cam (4), turn the pulley (1) by hand to set the driving lever (6) to the reverse position and so that the driving lever (6) is at its lowest point (when the thread take-up (8) is close to its lowest position). BAS-311H...
  • Page 100 12. Check that there is a gap of about 0 - 1 mm between the outside of the hole in the movable knife (12) and the ridge line on the shuttle race thread guide (14) when there is still play between the parts. BAS-311H...

  • Page 101: Replacing The Movable And Fixed

    If the knife pressure is too strong and the movable knife (6) turns stiffly, use a thicker movable knife spacer. 7. Apply grease to the pin (12), place it into the movable knife connecting plate (13), and install it to the needle plate (5). 8. Check that the needle is aligned with the center of the needle hole. BAS-311H...

  • Page 102: Installing The Feed Plate

    Place the rear edge of the feed plate (1) against the stepped part of base plate Y (2) (shaded section (A)) and use a 2 mm diameter pin (such as a needle) to align the hole in the feed plate (1) with the hole in base plate Y (2); then tighten the two socket bolts (3). BAS-311H...

  • Page 103: Adjusting The Thread Wiper

    Install the presser foot (1) with the screw (2) so that the distance from the bottom of the presser foot (1) to the top of the needle plate is 22 mm when the sewing machine is stopped and the presser foot (1) is raised. 5031Q BAS-311H...

  • Page 104: Adjusting The Intermittent Work Clamp

    Installation position Intermittent stroke range 2 - 4.5 mm 4.5 - 10 mm 0 mm (Intermittent presser foot does not move up and down) 5012Q BAS-311H...
  • Page 105 (If using a DP x 5 needle, align with the second reference line from the top (reference line b).) 4. Open the top cover and loosen the two set screws (7). 5. Align the index marks on the stepping clamp cam (8) and the stepping clamp connecting rod (4), and then tighten the two set screws (7). BAS-311H...
  • Page 106 <If they are touching> Remove the motor cover (5). Loosen the nut (6), and turn the bolt (7) until it is pressing against the intermittent drive lever (8), and then adjust until the two points mentioned above are not touching. BAS-311H...

  • Page 107: Adjusting The Work Clamp Lift Amount

    After adjustment is complete, push the handle (2) downward to lock it. If water has collected in the bottle of the regulator (1), turn the drain cock (3) in the direction indicated by the arrow to drain the water. NOTE: Open the air cock (4) slowly. 1912B BAS-311H...

  • Page 108: Belt Tension Adjustment

    The belt tension gauge should be set to measure a unit weight of 4 g/mm･m , a belt width of 30 mm and a span length of 310 mm. It is recommended that you use the Yunitta U-505 tension gauge. BAS-311H...

  • Page 109: Adjusting The Tension Release Amount

    2. Check that the tension disc opening amount is 1.0 - 1.5 mm when the tension release solenoid (1) is installed to the arm and the plunger is pushed with a screwdriver or similar tool through the hole in the solenoid cover. BAS-311H...

  • Page 110: Adjusting The Backlash Of The Lower

    R (6) against the edge of the bed and tighten the set screw (4). 5. Turn the rock gear shaft (7) to adjust the play at the end of the driver (8) to 0.05 – 0.15 mm, and tighten the three set screws(3). BAS-311H...

  • Page 111: Adjusting The Home Position

    If you would like to reset, press the RESET key for 2 seconds or more at this time. Then the offset value will be 2nd step reset to “0” and home position detection for the work clamp lift motor will be carried out. 4441Q 2634B (Continued on next page) BAS-311H...
  • Page 112 Press the ▲ key once to reduce the offset value by 1. For example, if the offset value is -2. ･ The work clamp driving gear (3) will move in conjunction with the setting value. 5207Q 2800B 2801B 2899B BAS-311H...
  • Page 113 2414B Press the TEST key. Exit adjustment mode ･ The display will return to the normal display and the sewing machine will switch to home position detection standby. TEST indicator switches off 2404B Turn off the power switch. BAS-311H...

  • Page 114: X-Y Feed Home Position

    If you would like to reset, press the RESET key for 2 seconds or more at this time. Then the offset value will be reset to “0” and home position detection for the X-feed or Y-feed motor will be carried out. 4441Q 2791B 2634B BAS-311H...
  • Page 115 The X-feed or Y-feed motor will operate according to the offset value. ･ The offset value in the menu display will flash, and For example, if the offset “JoG” will illuminate in the TENSION display. value is 5. 3258B 2793B 2794B 2795B (Continued on next page) BAS-311H...
  • Page 116 (if “JoG” is illuminated), the invalid buzzer will sound. 2414B Exit adjustment mode Press the TEST key. ･ The display will return to the normal display and the sewing machine will switch to home position detection standby. TEST indicator switches off 2404B BAS-311H...

  • Page 117: Adjusting The Motor Standard Position

    The display will return to the normal display and the sewing machine will switch to home position detection standby. TEST indicator switches off 2404B Turn off the power switch, and install the needle and the needle bar thread guide. BAS-311H...

  • Page 118: Adjusting The Needle Up Stop Position

    The upper shaft will move and stop at the offset value that has been set. 4441Q Press the TEST key. Exit adjustment mode ･ The offset value will be memorized and the sewing machine will switch to home position detection standby. TEST indicator switches off 2404B BAS-311H...

  • Page 119: Setting Method For Standard Depression

    If the foot switch operations are not carried out correctly, “END” will not be displayed and the buzzer will sound. After “1.Frt” is displayed in the menu display, repeat the operation from step 2. 3400B Turn off the power. BAS-311H...

  • Page 120: Applying Grease (Feed Mechanism)

    <Applying grease> Use Brother-specified “Grease unit (SB1275-101)”. Ask the place of purchase for details on obtaining these items. 1. Using the tube 3220B 2.
  • Page 121 Push the work clamp arm (3) all the way to the front edge, lift up the bellows (4), and then apply grease to groove B. 4. Install the feed plate. (Refer to the CD Instruction Manual “10-11. Installing the feed plate”.) BAS-311H...

  • Page 122: Electric Mechanism

    In such a case, be careful no to touch any place other than that for the measurement. In addition, always keep in mind that a high voltage remains for about 5 minutes after power is turned off. Injury When separating or rejoining connectors, and measuring something, be careful not to cut your fingers on metal parts such as heat sinks and covers. BAS-311H...

  • Page 123: Components Inside And Outside The Control Box And In The Operation

    Eliminates electrical noise that is transmitted along the power supply line. Panel PCB Secured inside the operation panel. This PCB controls indications of the machine status and the input operation. Control box Operation panel Main PCB Motor PCB Panel PCB Transformer box Power PCB NF box 3211B BAS-311H...

  • Page 124: Fuse Explanation

    If a component on a PCB is damaged, the fuses may blow again soon even after they have been replaced. Part name Part code When a fuse has blow G fuse 10A-250V The power indicator is not illuminated, and nothing J04417-001 (Glass tube fuse, 10A-250V) operates. Motor PCB 2930B BAS-311H...

  • Page 125: Description Of Connectors

    As a result, check that all connectors are inserted correctly and that the pins and wires are crimped properly before carrying out problem diagnosis. 10-4-1. Connector positions Main PCB 3421B Motor PCB (Refer to the diagram in “10-3. Fuse explanation”.) BAS-311H...
  • Page 126 10. ELECTRIC MECHANISM Power PCB 0831D Panel PCB 2687B BAS-311H...

  • Page 127: Symptoms When There Are Poor

    ･ The work clamp pulse motor rotates but the home position is not detected correctly. ･ Error [E300] is displayed. 3423B ･ The work clamp pulse motor does not rotate correctly. ･ Error [E300] or [E301] is displayed. 2938B BAS-311H...
  • Page 128 0838D Sewing operation Problem Connector No. and position ･ The power indicator is not illuminated, and nothing operates. ･ Machine operation is unstable. 2942B ･ The main shaft motor does not operate correctly. ･ Error [E130] is displayed. 2943B BAS-311H...
  • Page 129 Error [E055] is displayed after the power is turned on. 2946B ･ Error [E452] is displayed after the power is turned on. 2947B ･ The machine does not start up with the “brother” display appearing. 2948B (Continued on next page) BAS-311H...
  • Page 130 ･ The sewing machine does not operate when the foot switch is depressed. ･ Error [E130] is displayed. 0848D ･ Error [E131] is displayed. 0849D ･ Error [E015] or [E016] is displayed after the power is turned on. 0843D BAS-311H...

  • Page 131: Troubleshooting

    Set-up operation or condition Yes-or-no decision-making The procedure to follow process continues on the next page The error status number in the first column of the table of Turning-off of the power switch “10-5-2. Problem solution and measures” 2707B 2952B BAS-311H...
  • Page 132 Note: If you depress to the foot switch to the 2nd position, the machine will start. Depress the foot For a two-pedal foot switch, depress the start switch. switch to the first position, and release it. Does the work clamp rise after it has lowered? 3321B BAS-311H...
  • Page 133 Does the feed mechanism move quickly? Does the tension release operate? Release the foot switch. Does the machine operate correctly for the set program, and return to the swing start position? Press the TEST key to turn off its indicator. 3322B BAS-311H...
  • Page 134 Is the thread trimmer activated? Does the needle stop in the up position? Insert the SD card, and then turn on the power. While pressing the TEST key, press the ENTER key. Is the SD card read/write mode active? 3323B Normal BAS-311H...

  • Page 135: Problem Solution And Measures

    1. While the power is turned off, check each connector is securely plugged in by referring to “10-4. Description of connectors”. 2. Find the error status number in the troubleshooting flowchart. 3. From the applicable part of the flowchart, take the reference number to find the correspondingly number details of the problem in the following table. BAS-311H...
  • Page 136 LD2 (red) on the power PCB. OK if illuminated. After checking, turn off the power switch, wait for one minute or more, and then insert P1 into the main PCB and P4 and P6 into the motor PCB. (Continued on next page) BAS-311H...
  • Page 137 1 and 4 of OK if approximately 24 V DC. 2713B 10. Malfunction of operation panel Check that connector P3 (PANEL) of the motor Operation panel assembly PCB is inserted. Panel PCB assembly Panel harness BAS-311H...
  • Page 138 10%. b. See #1-2. a. Check that the power supply voltage at the 9. If “E705” is displayed, the power mains is at the specification voltage plus or supply voltage is abnormally low. minus 10%. b. See #1-2. BAS-311H...
  • Page 139 1-2 and 3-4 of connector P15 (PEDAL) of the main PCB. (Check between pins 5-6 if using a two-pedal foot switch.) (Touch the ohmmeter against the lead wires without disconnecting the connector.) OK if the resistance is normally ∞ ohms but 0 ohms when depressed. 2716B BAS-311H...
  • Page 140 “3-7. Input checking method”. the motor PCB. OK if the signal turns on and off. b. If step a (above) is OK, there is a Motor PCB assembly malfunction of the motor PCB. BAS-311H...
  • Page 141 1-2 and 3-4 of the cord connector. cord. OK if 2-3 ohms. b. If step a (above) is OK, there is a malfunction Main PCB assembly 311H of the main PCB. 2719B BAS-311H...
  • Page 142 1-2 and 3-4 of the cord connector. cord. OK if 2-3 ohms. b. If step a (above) is OK, there is a malfunction Main PCB assembly 311H of the main PCB. 2721B BAS-311H...
  • Page 143 1-2 and 3-4 of the cord connector. the pulse motor and cord. OK if 2-3 ohms. b. If step a (above) is OK, there is a malfunction Main PCB assembly 311H of the main PCB. 2723B BAS-311H...
  • Page 144 Parts to be replaced Malfunction of foot switch and cord See #4. Error status #14 The machine does not operate correctly for the set program test feeding. Probable causes Check/repair/adjust Parts to be replaced Malfunction of foot switch and cord See #4. BAS-311H...
  • Page 145 Error status #16 The machine does not operate during sewing, and the error code [E130], [E131] or [E132] appears on the display. Probable causes Check/repair/adjust Parts to be replaced Malfunction of synchronizer, upper Refer to steps 1 to 4 in #5. shaft motor, fuses or motor PCB. BAS-311H...
  • Page 146 Turn the power back on, and OK if Motor 430 assembly operation is normal. If the area around the motor is not hot, carry out steps 1 to 5 in #17. Avoid repeated sewing of sewing data that contains 15 stitches or less. BAS-311H...
  • Page 147 If the uneven seams are due to insufficient motor or the mechanism is work clamp pressure, adjust while referring incorrectly adjusted. to “8-17. Adjusting the work clamp lift amount”. If there is play in the feed mechanism, adjust the feed mechanism. BAS-311H...
  • Page 148 With main PCB connector P3 (SOL2) connected, turn on the power and carry out sewing, and measure the voltage between pins 1-2 of connector P3 (SOL2). OK if there is voltage output momentarily after sewing stops. 2728B BAS-311H...
  • Page 149 Remove the write protection for the SD card. 3. Malfunction of SD card Use a PC to check if the contents of the SD card can be read. 4. Malfunction of operation panel See #11. Panel PCB assembly Panel harness BAS-311H...

  • Page 150: List Of Error Codes

    Check that connector P14 on the main P.C. board is properly connected. An operation panel key was still being pressed when the power was turned on, or key is faulty. E065 Turn off the power and check the operation panel. BAS-311H...
  • Page 151 Turn off the power, and then check the upper shaft motor. E150 (When sewing data with a small number of stitches (15 stitches or less) is sewn repeatedly (short cycle operation), the upper shaft motor may overheat and the “E150” error code may be generated.) BAS-311H...
  • Page 152 Turn off the power, and then check that connectors P18 and P22 on the main P.C. board are properly connected. Feed motor stopped due to a problem. E230 Reduce the sewing speed or set memory switch No.059 = 1. BAS-311H...
  • Page 153 Turn off the power, and then check if there are any problems in the work clamp vertical direction. E301 Turn off the power, and then check that connectors P19 and P23 on the main P.C. board are properly connected. BAS-311H...
  • Page 154 Problem with data in machine head memory. E453 Turn off the power, and then turn it back on again. Internal memory is full and copying is not possible. E474 Press the RESET key to clear the error. Clear the sewing data. BAS-311H...
  • Page 155 Upper thread breakage occurred. Thread the upper thread. Re-sewing is then possible. E600 Turn off the power, and then check that connector P14 on the main P.C. board is properly connected. Problem with the lower thread detector. E670 Turn off the power, and then check the lower thread detector. BAS-311H...
  • Page 156 Version updating could not be carried out. Turn off the power, and then turn it back on again. E887 If an error code that is not listed above appears or if carrying out the specified remedy does not solve the problem, contact the place of purchase. BAS-311H...

  • Page 157: Troubleshooting

    The thread wiper is obstructing the needle. Adjust the operating stroke of the Thread wiper dose not P.94 thread wiper. operate correctly. Adjust the operating stroke of the Thread wiper position is incorrect. P.94 thread wiper. (Continued on next page) BAS-311H...
  • Page 158 Process the work clamps and the Material is flapping. CD Instruction feed plate into shapes that can hold manual the material near the seam. CD Instruction Adjust the intermittent height of the intermittent work clamp. manual (Continued on next page) BAS-311H...
  • Page 159 Movable knife is not picking up the needle thread because the last Refer to “Skipped stitches occur”. P.149 stitch is being skipped. CD Instruction Increase the lower thread tension. Lower thread is not cut. Lower thread tension is too weak. manual (Continued on next page) BAS-311H...
  • Page 160 If using a heavy work clamp and feed plate, change the operation Work clamp and feed plate are too settings to the settings for Pattern is distorted. heavy. heavy-weight materials. Ask the place of purchase for details on the setting method. BAS-311H...

  • Page 161: Segment Display List

    13. 7-SEGMENT DISPLAY LIST 13. 7-SEGMENT DISPLAY LIST 4268M BAS-311H...
  • Page 162 SERVICE MANUAL © 2014 Brother Industries, Ltd. All Rights Reserved. BAS-311H I4011019B 2014.07. B (1)

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