Brother BAS-326G Service Manual

Direct drive programmable electronuc pattern sewer
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BAS-311G
SERVICE MANUAL
BAS-326G
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-326G

  • Page 1 BAS-311G SERVICE MANUAL BAS-326G Please read this manual before making any adjustments. DIRECT DRIVE PROGRAMMABLE ELECTRONIC PATTERN SEWER...
  • Page 2 This service manual is intended for BAS-311G, BAS-326G; be sure to read the BAS-311G, BAS-326G 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.
  • Page 3 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 4 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 5 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. Be careful not to get your hand caught when...
  • Page 6: Table Of Contents

    CF card .......... 33 5-14. Thread trimmer mechanism....... 56 3-16. Writing extended option output data to CF cards..........34 5-15. Shuttle hook mechanism ......57 3-17. Reading extended option output data from floppy disks ........34 BAS-311G, BAS-326G...
  • Page 7 7-6. Adjusting the needle clearance ....92 TABLE OF ERROR CODES ....7-7. Adjusting the shuttle race thread guide ..92 TROUBLESHOOTING ...... 7-8. Rotary hook lubrication amount....92 7-9. Adjusting the position of the movable 7-SEGMENT DISPLAY ..... knife ............93 BAS-311G, BAS-326G...
  • Page 8: Specifications

    Stitch formation Single needle lock stitch Max. sewing speed 2,700 rpm Sewing area (XxY) BAS-311G: Max. 130 x 100 mm, BAS-326G: Max. 220 x 100 mm Feed mechanism Intermittent feed, pulse motor drive 0.05 − 12.7 mm Stitch length No. of stitches 500,000-stitch internal memory (*) Maximum no.
  • Page 9: Function Settings

    Refer to “2-7. Error history checking method”. Refer to “7-20. Adjusting the home position”. Input checking function Needle up stop position adjustment mode 4545Q 4549Q Refer to “7-22. Adjusting the needle up stop position”. Refer to “2-8. Input checking method”. BAS-311G, BAS-326G...
  • Page 10: List Of Advanced Functions

    Refer to the Instruction Manual. Refer to “2-6. Stitch counter checking method”. Production counter temporary display function CF data read/write mode When SPEED indicator is illuminated 4553Q 4492Q Refer to “3-4. Data read/write mode”. Refer to the Instruction Manual. BAS-311G, BAS-326G...
  • Page 11: Memory Switch Setting Method (Advanced)

    RESET key while the number for that memory switch is displayed. • To return the settings for all memory switches to the default settings, keep pressing the RESET key for two or more seconds until the buzzer makes a long beep. BAS-311G, BAS-326G...
  • Page 12: List Of Memory Switch Settings

    Displayed as %. Displayed as mm. Split mode selection Continuous split (split menu is disabled before split detection) Continuous split (split menu is always enabled) Independent split *1 The mm display may differ slightly from the actual sewing size. BAS-311G, BAS-326G...
  • Page 13 *2 Allowable setting values by specification Pedal specifications Solenoid specifications Pneumatic specifications 1 pedal 1, 2, 8 1, 2 2 pedal 3, 4 3, 4, 5, 6, 7, 8 3 pedal 9, 10, 11 *3 Solenoid specifications: 1, Pneumatic specifications: 3 BAS-311G, BAS-326G...
  • Page 14 * Disabled when memory switch No. 050 = 2 or 4. Work clamp operation at sewing end Work clamp lifts automatically at the sewing end * Disabled when memory switch No. 050 = 2 or 4. Work clamp does not lift automatically at the sewing end BAS-311G, BAS-326G...
  • Page 15 0: Normal needle up position: Needle bar height increases for values in the -15 − 0 negative direction. *4 If the setting value becomes to large in the negative direction, error “E110” may be generated at the first sewing start after the power is turned on. BAS-311G, BAS-326G...
  • Page 16 [Feed end reference] Makes the timing uniform at the end of feed. [Linked to speed] Feed timing is uniform even if the sewing speed changes. Adjusts the feed motor output -5 − 5 -5: Low← 0: Standard → 5: High BAS-311G, BAS-326G...
  • Page 17 Feed moves to the start point after starting and switching. Feed moves to the next sewing start point at the same time as the user program switches. Limitations on changing settings for user programs No limit User program contents cannot be changed. BAS-311G, BAS-326G...
  • Page 18 Tension release timing during thread trimming [Units 8 degree steps] -10 − 1 -10: Early ← 0: Standard → 1: Late Thread nipping timing (*5) 1 − 4 1: Early ← 2: Standard → 4: Late *5 Not used for the BAS-311G and BAS-326G. BAS-311G, BAS-326G...
  • Page 19 1 minute.) Thread nipper device (*6) Disabled Thread nipper device installed (Memory switch No. 500 must also be set to ON or OFF.) *6 Not used for the BAS-311G and BAS-326G. BAS-311G, BAS-326G...
  • Page 20 (This memory switch does not return to the initial value when all settings are reset.) Specifications at the time of shipment from the factory (Specifications shown on the model plate on the machine head) Heavy-weight material specifications Medium-weight material specifications Extra heavy-weight material specifications BAS-311G, BAS-326G...
  • Page 21: Setting The Work Clamp Mode

    Automatic lift Automatic lift Dropped (*) 1st step drop Automatic lift Dropped (*) Dropped (*) Automatic lift Automatic lift Dropped (*) 2nd step drop Automatic lift Dropped (*) Dropped (*) (*) Work clamp lifts when pedal is depressed backward. BAS-311G, BAS-326G...
  • Page 22: Stitch Counter Checking Method

    2. Press the RESET key (7) for two seconds or more. (The cumulative number of stitches “0000” will stop flashing and illuminate, and the setting will be cleared. ) 3. When the TEST key (1) is pressed, the display will 5058Q return to the normal display. BAS-311G, BAS-326G...
  • Page 23: Error History Checking Method

    (6) is being pressed, the COUNTER indicator will illuminate and the stitch number counter value at the point where the error occurred will be displayed in the PROGRAM No. display (2) and the menu display (3) in units of 100 stitches. BAS-311G, BAS-326G...
  • Page 24: Input Checking Method

    Raise the work clamp by hand. Work clamp motor encoder counter value [-999] − [999] [ 6] [EnP] Raise the work clamp by hand. Upper shaft 180 degree rotation signal [ 0] − [180] [ 7] [Enn] Turn the pulley by hand. BAS-311G, BAS-326G...
  • Page 25 [ on] / [ oFF] Option input (IN5) [ 26] [rot] [ on] / [ oFF] Option input (IN11) [ 27] [Fib] [ on] / [ oFF] Fiber-type thread breakage detection [Option compatibility] *1 Not used for the BAS-311G and BAS-326G. BAS-311G, BAS-326G...
  • Page 26 [ on] / [ oFF] Option input (IN7) [ 33] [in8] [ on] / [ oFF] Option input (IN8) [ 34] [in9] [ on] / [ oFF] Option input (IN9) [ 35] [in10] [ on] / [ oFF] Option input (IN10) BAS-311G, BAS-326G...
  • Page 27: Output Checking Method

    Needle cooler valve turns on. (OUT12) (*1) The panel LEDs illuminate in order, and then the seven segments of the [ 60] PROGRAM No. display and the menu display illuminate one by one. *1 Applies for pneumatic specifications when corresponding devices are installed. BAS-311G, BAS-326G...
  • Page 28 Turns on option output 17. [ 77] [oP18] Turns on option output 18. [ 78] [oP19] Turns on option output 19. [ 79] [oP20] Turns on option output 20. *2 Can be determined automatically using a connector shorting pin. BAS-311G, BAS-326G...
  • Page 29: Software Version Checking Method

    Main CPU [2.Mt] Motor CPU [3.PL] Panel CPU [4.iP] Main CPU (IPL) [5.PG] Programmer When the TEST key (5) is pressed, the display will return to the normal display and the sewing machine will change to home position standby. BAS-311G, BAS-326G...
  • Page 30: Reading / Writing Data

    0 − 99 100 − 999 r1 mode r9 mode 0 − 99 100 − 999 Old model series data range BAS-311G, BAS-326G data range (BAS***.SEW) ISM***.SEW Sewing machine internal memory When memory switch r1 mode No. 755 = ON...
  • Page 31: Notes On Handling Cf Cards (Sold Separately)

    : Sewing data P No. = 102 The underlined portion of the name of the \BROTHER\ISM\SMDB00 folder for sewing data can be changed by changing the setting for memory switch No. 752 in order to change the folder name. Change the folder name if you would like to store sewing data for different sewing machines on a single CF card.
  • Page 32: Data Read/Write Mode

    Extended option output data is read from the floppy disk. (*2) The sewing data that can be use with this sewing machine is data that has been created for the BAS-311G/BAS-326G. Only valid when using an optional floppy disk drive.
  • Page 33: Reading Sewing Data From Cf Cards

    If you then press the RESET key, the display will change back to [ ALL]. 4976Q Loading End data read/write mode Press the TEST key. Turn off the power switch, remove the CF card, and then close the cover of the CF slot. TEST indicator switches off BAS-311G, BAS-326G...
  • Page 34: Writing Sewing Data To Cf Cards

    STOP switch. If you then press the RESET key, the display will change back to [ ALL]. 4977Q Writing End data read/write mode Press the TEST key. Turn off the power switch, remove the CF card, and then close the cover of the CF slot. TEST indicator switches off BAS-311G, BAS-326G...
  • Page 35: Reading Memory Switch Data From Cf Cards

    CF card. 4579Q Writing End data read/write mode Press the TEST key. Turn off the power switch, remove the CF card, and then close the cover of the CF slot. TEST indicator switches off BAS-311G, BAS-326G...
  • Page 36: Reading User Program Data From Cf Cards

    CF card. 4579Q Writing End data read/write mode Press the TEST key. Turn off the power switch, remove the CF card, and then close the cover of the CF slot. TEST indicator switches off BAS-311G, BAS-326G...
  • Page 37: Updating The Control Program

    Turn on the power switch. The operation panel will switch off and the version updating will be carried out. When the initial screen turns back on, the updating is complete. Turn off the power switch, remove the CF card, and then close the cover of the CF slot. BAS-311G, BAS-326G...
  • Page 38: Writing Error Log Data To Cf Card

    * Program numbers that contain no data will also be displayed at this time. * If [ ALL] is selected, all sewing data will be read at once. 4577Q BAS-311G, BAS-326G...
  • Page 39: Writing Sewing Data To Floppy Disks

    5064Q Press the R/W key. • [Fdd-] will change to [ ALL]. Press the key to select the program number to be written. * If [ ALL] is selected, all sewing data will be written at once. 4577Q BAS-311G, BAS-326G...
  • Page 40: Reading Extended Option Output Data From A Cf Card

    CF card and copied into the sewing machine's internal memory. 4498Q Loading When [ End] is displayed, the process is complete. Turn off the power switch, remove the CF card, and then close the cover of the CF slot. 4581Q BAS-311G, BAS-326G...
  • Page 41: Writing Extended Option Output Data To Cf Cards

    • The buzzer will sound and the extended option output data will be loaded from the floppy disk and copied into the sewing machine's internal memory. 5069Q Loading When [ End] is displayed, the process is complete. Turn off the power and remove the floppy disk. 5070Q BAS-311G, BAS-326G...
  • Page 42: Mechanical Descriptions

    <6> Thread take-up support 7. Needle bar 4-2. Lower shaft and shuttle race mechanisms 5042Q 1. Motor assy 2. Upper shaft 3. Crank rod assy 4. Rock gear 5. Lower gear 6. Lower shaft 7. Driver 8. Shuttle hook BAS-311G, BAS-326G...
  • Page 43: Work Clamp Lifter Mechanism (Solenoid Specifications)

    6. Work clamp lifter link 7. Work clamp lifter lever 8. Work clamp lifter plate assy 5043Q 9. Slider 10. Work clamp lifter lever 11. Connecting rod 12. Connecting link 5044Q 13. Work clamp lifter lever 14. Work clamp BAS-311G, BAS-326G...
  • Page 44: Work Clamp Lifter Mechanism (Pneumatic Specifications)

    4. Stepping foot driving lever 5. Stepping clamp lifter rod 5046Q 6. Stepping clamp lifter 7. Stepping clamp lifter link 8. Stepping clamp link 9. Stepping clamp link B 10. Presser bar clamp 11. Presser bar 12. Presser foot BAS-311G, BAS-326G...
  • Page 45: Intermittent Presser Foot Stroke Mechanism

    4. Stepping clamp connecting rod 5. Stepping clamp arm R 6. Stepping clamp arm F 7. Stepping clamp link A 8. Stepping clamp link A 9. Stepping clamp link B 10. Presser bar clamp 11. Presser bar 12. Presser foot BAS-311G, BAS-326G...
  • Page 46: Feed Mechanism

    1. X-feed motor assy 2. Gear 3. X-feed gear 4. Y-ball spline 5. X-GT belt 6. Feed bracket X Y direction 5053Q 1. Y-feed motor L assy 2. Gear 3. Y-feed gear 4. Y-GT belt 5. Feed bracket assy BAS-311G, BAS-326G...
  • Page 47: Thread Trimmer Mechanism

    6. Thread trimmer cam 7. Thread trimmer rod V 8. Thread trimmer lever V 9. Thread trimmer lever H 10. Thread trimmer rod H 11. Movable knife lever 12. Movable knife connecting plate 13. Movable knife 14. Fixed knife BAS-311G, BAS-326G...
  • Page 48: Tension Release Mechanism

    4. Tension release pin 4-10. Thread wiper mechanism 5050Q 1. Thread wiper solenoid assy 2. Thread wiper rod 3. Thread wiper crank assy 4. Wiper When the thread wiper solenoid assembly is turned off, the wiper operates in the opposite direction. BAS-311G, BAS-326G...
  • Page 49: Disassembly

    Keep the oil out of the reach of children. Disassemble each part in order of the numbers. 5-1. Covers 1. Top cover 5. Eye guard 2. Motor cover 6. Face plate 5051Q 3. Motor cover R 7. Shuttle race cover assy 4. Motor cover L BAS-311G, BAS-326G...
  • Page 50: Thread Wiper Mechanism

    5-2. Thread wiper mechanism 5090Q 1. Thread wiper solenoid harness (Pull out) 2. STOP switch harness (Pull out) 3. Bolt 4. Plain washer 5. Removed washer (Assemble) 6. Removed bolt (Assemble) 7. Bolts with washer [2 pcs] 8. Thread wiper unit BAS-311G, BAS-326G...
  • Page 51: Work Clamp Arm Mechanism

    5. DISASSEMBLY 5-3. Work clamp arm mechanism Pneumatic specifications 5054Q 5055Q 1. Set screw 2. Needle 3. Needle bar thread guide 4. Bolts [4 pcs] 5. Work clamp assy 6. Bolts with washer [2pcs] 7. Feed plate BAS-311G, BAS-326G...
  • Page 52: Intermittent Presser Foot Lifter Mechanism (1)

    15. Link shaft (Pull out) 6. Screw 16. Washer 7. Shoulder screw 17. Stepping clamp lifter link (Remove as unit) 8. Screw 18. Presser bar 9. Plain washers [2 pcs] 19. Bolt (Loosen) 10. Finger guard 20. Stepping clamp arm F BAS-311G, BAS-326G...
  • Page 53: Needle Bar Mechanism

    6. Rubber caps [2 pcs] 16. Needle bearing 7. Set screws [2 pcs] (Loosen) 17. Thread take-up lever assy 8. Thread take-up support shaft assy 18. Washer 9. Thread take-up support 19. Bolts [2 pcs] 10. Screw (Loosen) 20. Slide block guide BAS-311G, BAS-326G...
  • Page 54: Upper Shaft Mechanism

    12. Set screws [2 pcs] (Loosen) 27. Bobbin winder driving wheel 13. Set screws [2 pcs] (Loosen) 28. Stepping clamp cam assy 14. Set screws [2 pcs] (Loosen) 29. Set screw (Loosen) 15. Set screws [2 pcs] (Loosen) 30. Pulley assy BAS-311G, BAS-326G...
  • Page 55: Lower Shaft Mechanism

    12. Set screw (Loosen) 13. Set screw collar, R 14. Set screws [2 pcs] (Loosen) 15. Set screw collar, B 16. Rock gear shaft [Pull out from the rear of the machine] 17. Rock gear 18. Crank rod [Lower part] 5098Q BAS-311G, BAS-326G...
  • Page 56: Feed Covers

    3. Screws [4 pcs] 4. Bellow assy 5. Screws [2 pcs] 6. Cover connecting plate 7. Screws [16 pcs] 8. Cover rails [2 pcs] 9. Inside covers [2 pcs] 10. Outside covers [2 pcs] 11. Fixed covers [2 pcs] 5102Q BAS-311G, BAS-326G...
  • Page 57: Feed Mechanism

    17. Bolts [4 pcs] 18. Y-belt presser plate 19. Y-belt support plate 20. Set screws [2 pcs] (Loosen) 21. Y-pulley bracket 22. Y-pulley fulcrum shaft 23. Y-pulley assy 24. Y-GT belt 25. Ball bearings [2 pcs] 5104Q 5105Q BAS-311G, BAS-326G...
  • Page 58 36. Bolts [4 pcs] 37. Washers [4 pcs] 38. Bolts [8 pcs] 39. Spring washers [8 pcs] 40. Plain washers [8 pcs] 5117Q 41. Y-LM guides [2 pcs] 42. Flat screws [16 pcs] 43. Y-LM spacers [2 pcs] 5106Q 5107Q BAS-311G, BAS-326G...
  • Page 59 50. X-belt holder 51. X-belt holder plate 52. Bolts [2 pcs] 53. Plain washers [2 pcs] 54. Set screws [2 pcs] (Loosen) 55. X-pulley fulcrum shaft 56. X-pulley bracket 57. X-right pulley assy 58. Plain washer 59. X-GT belt BAS-311G, BAS-326G...
  • Page 60: Work Clamp Lifter Mechanism (Solenoid Specifications)

    22. Work clamp fulcrum shaft 9. Work clamp driving gear 23. Work clamp cam gear 10. Bolts [2 pcs] 24. Work clamp cam 11. Work clamp motor plate 25. Ball bearings [2 pcs] 12. Set screw (Loosen) 13. Work clamp lever shaft BAS-311G, BAS-326G...
  • Page 61: Work Clamp Lifter Mechanism (Pneumatic Specifications)

    12. Stepping foot driving lever 13. Set screw (Loosen) 14. Set screw (Loosen) 15. Screw 16. Plain washer 17. Retaining ring C 18. Work clamp fulcrum shaft 19. Work clamp cam gear 20. Ball bearings [2 pcs] 5110Q BAS-311G, BAS-326G...
  • Page 62: Tension Release Mechanism

    19. Retaining ring E 9. Spring washers [2 pcs] 5111Q 5-13. Intermittent presser foot lifter mechanism (2) 1. Flat screw 2. Set screw (Loosen) 5112Q 3. Stepping clamp lifter shaft (Pull out) 4. Stepping clamp lifter (Pull forward) BAS-311G, BAS-326G...
  • Page 63: Thread Trimmer Mechanism

    29. Thread trimmer collar 8. Washer 19. Set screw 30. Screws [2 pcs] 9. Solenoid cushion 20. Guide shaft 31. Flat screws [2 pcs] 10. Bolts [2 pcs] 21. Spring 32. Needle plate 11. Spring washers [2 pcs] 22. Cushion BAS-311G, BAS-326G...
  • Page 64: Shuttle Hook Mechanism

    56. Retaining ring, C 63. Thread trimmer rod H 49. Shoulder screw B 5-15. Shuttle hook mechanism 5116Q 1. Bobbin case assy 2. Shuttle race base setting claw [Open to right and left] 3. Shuttle race base 4. Shuttle hook BAS-311G, BAS-326G...
  • Page 65: Assembly

    Apply grease to the required places when reassembling the parts and once every two years. 6-1. Thread trimmer mechanism (1) Apply grease <GREASE BZL-301 (SA2694-001)> specified by Brother to the portions indicated by the white arrows. When the ball joint assembly of thread trimmer rod H has been disassembled, assemble it so that the distance between the centers of the holes is 376 ±...
  • Page 66 27. Set screw 44. Shoulder screw B 28. Thread trimmer solenoid 45. Nut 29. Solenoid setting plate 46. Plain washer 30. Plain washers [2 pcs] 47. Spring washer 31. Spring washers [2 pcs] 48. Bolt 32. Bolts [2 pcs] 4615Q BAS-311G, BAS-326G...
  • Page 67: Intermittent Presser Foot Lifter Mechanism (1)

    11. Plain washers [2 pcs] 12. Spring washers [2 pcs] 13. Bolts [2 pcs] 14. Solenoid cover 15. O rings [2 pcs] 16. Shoulder screws [2 pcs] 17. Tension release pin 18. Tension bracket 19. Set screw 5139Q BAS-311G, BAS-326G...
  • Page 68: Work Clamp Lifter Mechanism (Solenoid Specifications)

    6. ASSEMBLY 6-4. Work clamp lifter mechanism (Solenoid specifications) Apply grease <GREASE BZL-301 (SA2694-001)> specified by Brother to the portions indicated by the white arrows. 5159Q Ball bearings [2 pcs] Work clamp cam Work clamp cam gear Work clamp fulcrum shaft...
  • Page 69 B through the work clamp lifter lever. NOTE: When the work clamp lifter plate assembly is lowered, the slide block moves away, so hold the work clamp lifter plate assembly in place until the link shoulder screw is tightened. Align 5163Q BAS-311G, BAS-326G...
  • Page 70 Align the index marks on the work clamp cam gear and the work clamp driving gear, and then install the work clamp motor plate with the two bolts so that there is no backlash. BAS-311G, BAS-326G...
  • Page 71: Work Clamp Lifter Mechanism (Pneumatic Specifications)

    6. ASSEMBLY 6-5. Work clamp lifter mechanism (Pneumatic specifications) Apply grease <GREASE BZL-301 (SA2694-001)> specified by Brother to the portions indicated by the white arrows. Set the work clamp cam gear so that there is no clearance between it and the ball bearing in the shaft...
  • Page 72 Align the index marks on the work clamp cam gear and the work clamp driving gear, and then install the work clamp motor plate with the two bolts so that there is no backlash. BAS-311G, BAS-326G...
  • Page 73: Feed Mechanism

    If they are not aligned, the steel balls inside the nut will fall out. 5174Q 15. Retaining rings C [2 pcs] 5175Q 16. Plain washers [2 pcs] 17. Bolts [2 pcs] (Temporarily tighten) BAS-311G, BAS-326G...
  • Page 74 21. Plain washers [8 pcs] 29. Flat screws [8 pcs] 22. Spring washers [8 pcs] 30. X-belt holder 23. Bolts [8 pcs] 31. X-belt holder plate 24. X-LM guide [2 pcs] 32. Bolts [2 pcs] 25. Bolts [8 pcs] 5215Q BAS-311G, BAS-326G...
  • Page 75 Place the Y-LM guide against the wall of the bed, and then tighten the bolts. 49. Washers [4 pcs] 50. Bolts [4 pcs] 51. Bolts [4 pcs] 5179Q 52. Bolts with washers [2 pcs] (Temporarily tighten) BAS-311G, BAS-326G...
  • Page 76 54. Bolts with washer [3 pcs] (Temporarily tighten) 55. Y-feed motor L assy 56. Bolts with washer [3 pcs] (Temporarily tighten) 57. Y belt cover 58. Screws with washer [4 pcs] 59. Oil cover 60. Screws [5 pcs] 61. Flat screws [3 pcs] 5181Q BAS-311G, BAS-326G...
  • Page 77 The belt tension gauge should be set to measure a unit weight of 0.04 kg/m, a belt width of 30 mm and a span length of 370 mm. The recommended belt tension gauge to use is the Dr. TENSION TYPE-ll manufactured by MITSUBOSHI BELTING LTD. BAS-311G, BAS-326G...
  • Page 78 The belt tension gauge should be set to measure a unit weight of 0.04 kg/m, a belt width of 30 mm and a span length of 370 mm. The recommended belt tension gauge to use is the Dr. TENSION TYPE-ll manufactured by MITSUBOSHI BELTING LTD. BAS-311G, BAS-326G...
  • Page 79 X feed bracket (1) from one edge to the other in the Y direction. Tighten the two bolts (2) at the place where the load is 39 – 78 N (variation within 20 N). 5186Q BAS-311G, BAS-326G...
  • Page 80: Feed Covers

    8. Outside cover assemblies [2 pcs] (Place into cover rail.) 9. Cover connecting plate 10. Screws [2 pcs] 11. Cover rail 12. Screws M4X10 [6 pcs] 13. Screws M4X4 [2 pcs] 14. Bellow assy 15. Screws [4 pcs] 5190Q BAS-311G, BAS-326G...
  • Page 81 20. Auxiliary plate cushions [10 pcs] · 21. Screws [10 pcs] (Tighten to 0.5 N 22. Nuts [10 pcs] 23. Bolts with washer [4 pcs] After installing, carry out the adjustments in "7-20-2. X-Y feed home position ". BAS-311G, BAS-326G...
  • Page 82: Upper Shaft Mechanism

    Apply adhesive (Threebond 1401 or similar) to the thread 6. Screw section of the screw. 7. Set screw 8. Set screws [2 pcs] 9. Set screws [2 pcs] 10. Rubber cap 11. Set screws [2 pcs] 12. Joint assy 13. Set screws [2 pcs] BAS-311G, BAS-326G...
  • Page 83 16. Fries wheels [2 pcs] 17. Screws [3 pcs] 18. Set screws [2 pcs] 19. Thread trimmer cam 20. Set screws [2 pcs] 21. Set screws [2 pcs] 22. Set screws [2 pcs] (Temporarily tighten) 23. Pulley assy 24. Set screw 5182Q BAS-311G, BAS-326G...
  • Page 84: Needle Bar Mechanism

    6. ASSEMBLY 6-9. Needle bar mechanism Apply grease <GREASE BZL-301 (SA2694-001)> 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 screw to install.
  • Page 85 Needle bar machine pulley is turned to raise the needle bar from its lowest bush position, and then set the cut section so that it is facing forward and tighten the screw. 4647Q BAS-311G, BAS-326G...
  • Page 86: Intermittent Presser Foot Lifter Mechanism (2)

    19. Adjusting screw nut 20. Presser adjusting screw 21. Presser foot 22. Plain washers [2 pcs] 23. Finger guard 24. Screw (Temporarily tighten) Tighten the set screw on the screw flat while lightly pressing the link shaft. 5194Q BAS-311G, BAS-326G...
  • Page 87 Turn the work clamp cam gear (1) to move the stepping foot driving lever (2) to the dotted line position shown in the illustration. Set the needle bar to the timing position. Loosen the nut (10) and turn the bolt (11) to set the height of the presser foot (7) to 0.5 mm above the needle plate. BAS-311G, BAS-326G...
  • Page 88: Lower Shaft Mechanism

    (Insert from the rear of the machine head) 6. Rock gear 7. Set screw collar, B 8. Set screws [2 pcs] 9. Set screw collar, R 10. Set screw (Temporarily tighten) 11. Set screws [2 pcs] (Temporarily tighten) BAS-311G, BAS-326G...
  • Page 89 16. Adjusting stud 17. Set screw 18. Crank rod [Lower part] (Insert into upper shaft crank) 19. Needle bearing 20. Crank rod [Upper part] (Align the mating mark) 21. Bolts [2 pcs] 22. Crank cover 5148Q 23. Screws [3 pcs] BAS-311G, BAS-326G...
  • Page 90: Shuttle Hook Mechanism

    5. Shuttle race base 6. Shuttle race base setting claw (Close) 7. Bobbin 8. Bobbin case 6-13. Thread trimmer mechanism (2) Apply grease <GREASE BZL-301 (SA2694-001)> specified by Brother to the portions indicated by the white arrows. 5151Q 5152Q Movable knife connecting plate 1.
  • Page 91: Work Clamp Arm Mechanism

    After installing, carry out test feeding and check that the needle hole is inside the work clamp and the feed plate frame. If the needle hole is not inside the frame, adjust the position of the work clamp arm assembly and feed plate. BAS-311G, BAS-326G...
  • Page 92: Adjustments After Work Clamp Arm Installation

    <Work clamp pressure adjustment> Loosen the nut (13), and tighten the set screw (14). (Up to a maximum of 0.3 mm) When the work clamp pressure is even at the front and back of the work clamp, tighten the nut (13). BAS-311G, BAS-326G...
  • Page 93: Thread Wiper Mechanism

    2. Bolts with washer [2 pcs] 3. Bolt (Remove) 4. Plain washer (Remove) 5. Removed plain washer 6. Removed bolt 7. STOP switch harness 8. Thread wiper solenoid harness Adjust the thread wiper after installing. (Refer to “7-11. Adjusting the thread wiper”.) BAS-311G, BAS-326G...
  • Page 94: Covers

    Face plate assy 10. Motor cover R Screws [3 pcs] 11. Screws [4 pcs] Eye guard assy 12. Motor cover Plain washers [2 pcs] 13. Screws [4 pcs] Screws [2 pcs] 14. Top cover 15. Screws [6 pcs] BAS-311G, BAS-326G...
  • Page 95: Adjustment

    In addition, do not apply excessive force when tilting back the machine head. The sewing machine may Ask your Brother dealer or a qualified electrician to become unbalanced and fall down, and serious injury carry out any maintenance and inspection of the or damage to the sewing machine may result.
  • Page 96: Standard Thread Tension

    0.6 − 1.2 0.2 − 0.5 tension (N) 0.1 − 0.6 0.1 − 0.3 Pre-tension (N) Needle DP x 17 #19 DP x 5 #16 Normal sewing speed 2,000 rpm 2,000 rpm 7-2-1. Upper and lower thread tension 4661Q 5155Q BAS-311G, BAS-326G...
  • Page 97: Thread Take-Up Spring

    More thread Less thread (1) to the left. (The thread take-up amount will become greater.) * When sewing light material, move arm thread guide R (1) to the right. (The thread take-up amount will become less.) Index mark 5030Q BAS-311G, BAS-326G...
  • Page 98: Adjusting The Needle Bar Height

    If it crosses the needle more than necessary, it will place a load on the needle, or it may cause poor thread tension. Furthermore, if it does not cross the needle at all, the tip of the rotary hook will interfere with the needle and skipped stitches may occur. BAS-311G, BAS-326G...
  • Page 99: Adjusting The Needle Clearance

    • If the set screw (1) is turned clockwise, the lubrication amount becomes smaller. • If the set screw (1) is turned counterclockwise, the lubrication amount becomes greater. Aligned 4996Q BAS-311G, BAS-326G...
  • Page 100: Adjusting The Position Of The Movable Knife

    5. Move the thread trimming rod H (9) forward or back to adjust so that the distance from the ridge line on the right side of the needle plate to the ridge line on the movable knife (8) is 9.5 − 9.9 mm. 6. After tightening the bolt (7), check the above position once more. BAS-311G, BAS-326G...
  • Page 101: Bas-311G, Bas-326G

    10. Check that there is a gap of about 0 - 1 mm between the outside of the hole in the movable knife (8) and the ridge line on the shuttle race thread guide (12) when there is still play between the parts. BAS-311G, BAS-326G...
  • Page 102: Replacing The Movable And Fixed Knives

    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-311G, BAS-326G...
  • Page 103: Installing The Feed Plate

    Use a 2 mm diameter pin to align the holes in the X feed bracket (1) and the needle plate (2) with the two holes in the feed plate (3), and then tighten the two bolts (4). NOTE: Install the feed plate so that the surface with the index mark is facing upward. 5006Q End feed plate installation mode Turn off the power. BAS-311G, BAS-326G...
  • Page 104: Adjusting The Thread Wiper

    Install the presser foot (1) with the screw (2) so that the distance from the bottom of the presser foot 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-311G, BAS-326G...
  • Page 105: Changing The Intermittent Stroke

    If the position of the stepping clamp connecting rod is adjusted as described in the following at any one of the installation positions, the adjustment range for the intermittent stroke will as given in the following table. Installation position Intermittent stroke range 2 − 4.5mm 4.5 − 10mm 0 mm (Presser foot does not move up and down) 5012Q BAS-311G, BAS-326G...
  • Page 106 <If they are touching> Remove the motor cover (4). Loosen the nut (5), and turn the bolt (6) until it is pressing against the intermittent drive lever (7), and then adjust until the two points mentioned above are not touching. BAS-311G, BAS-326G...
  • Page 107: Adjusting The Work Clamp Lift Amount

    If water has collected in the bottle of the regulator (1), turn the drain cock (3) in the direction indicated by an arrow to drain the water. NOTE: Open the air cock (4) slowly. 5020Q BAS-311G, BAS-326G...
  • Page 108: Adjusting The Thread Trimmer Cam Position

    The belt tension gauge should be set to measure a unit weight of 0.04 kg/m, a belt width of 30 mm and a span length of 370 mm. The recommended belt tension gauge to use is the Dr. TENSION TYPE-ll manufactured by MITSUBOSHI BELTING LTD. BAS-311G, BAS-326G...
  • Page 109: Adjusting The Tension Release Amount

    If memory switch No. 552 has been set so that the tension release timing is early, you can increase the trailing length for the upper thread. BAS-311G, BAS-326G...
  • Page 110: Adjusting The Backlash Of The Lower Shaft Gear

    At the position where the pulley moves freely, place set screw collar R (7) against the edge of the bed and tighten the set screw (8). Turn the rock gear shaft (10) to adjust the play at the end of the driver (11) to 0.05 – 0.15 mm, and tighten the set screws (6). BAS-311G, BAS-326G...
  • Page 111: Adjusting The Home Position

    (2) and the work clamp driving gear (3) to the center line, and then press the key to change the offset value (-999 – 999). • The work clamp driving gear (3) will move in Index mark conjunction with the setting value. 5207Q 5208Q BAS-311G, BAS-326G...
  • Page 112: X-Y Feed Home Position

    • Home position detection will be carried out, and the feed mechanism will stop at the currently-registered home position. * If you press the RESET key for 2 seconds or more at this time, the offset value will be reset to “ 0 ”. BAS-311G, BAS-326G...
  • Page 113 TEST indicator switches off NOTE: Always be sure to press the RESET key and check the home position before ending adjustment mode. If you end adjustment mode without checking the home position, error "E202" may be generated. BAS-311G, BAS-326G...
  • Page 114: Adjusting The Needle Up Stop Home Position

    Remove the fries wheels and loosen the bolt (7) of the magnet (6) by 1/4 of a turn. 10. Move the magnet (6) to the precise point where the menu display switches from “ on” to “ oFF”, and then tighten the bolt (7). BAS-311G, BAS-326G...
  • Page 115: Adjusting The Needle Up Stop Position

    Depress the foot switch to the 2nd step. (If using a two-pedal foot switch, lower the work clamp before depressing the start switch.) • X-Y home position detection will be carried out and the "orG" will 2nd step stop flashing and illuminate steadily. 4441Q BAS-311G, BAS-326G...
  • Page 116 • The upper shaft will move and stop at the offset value that has been 2nd step set. 4441Q End adjustment mode. Press the TEST key. • The offset value will be memorized and the sewing machine will switch to home position detection standby. TEST indicator switches off BAS-311G, BAS-326G...
  • Page 117: Electrical Mechanism

    The fan inside the control box turns while the power is turned on, so be careful not to get anything caught in it. Be careful not to touch metallic objects such as the heat sink and cover when connecting and disconnecting connectors and making measurements. BAS-311G, BAS-326G...
  • Page 118: Inside The Control Box And Operation Panel Structure

    Secured to the inside of the operation panel. This P.C. board is used for displaying the sewing machine status and for input operations. Control box Operation panel DC fan motor Panel P.C. board NF P.C. board Power supply motor P.C. board Main P.C. board Conversion PMD P.C. board transformer 4588Q 5071Q BAS-311G, BAS-326G...
  • Page 119: Description Of Fuses

    Fuse 3AFB DC fan motor does not operate and [E740] is 616167-001 (Glass tube fuse 3A-250V) displayed. Fuse 15AFB Power indicator does not illuminate and nothing SA3794-001 (Glass tube fuse 15A-250V) operates. Power supply motor P.C. board 4590Q BAS-311G, BAS-326G...
  • Page 120: Description Of Connectors

    A large number of problems are often caused by connectors that are not inserted correctly or which are contacting poorly. As a result, check that all connectors are inserted correctly and that the pins and wires are crimped properly before carrying out problem diagnosis. 8-4-1. Connector positions Main P.C. board 5072Q BAS-311G, BAS-326G...
  • Page 121 8. ELECTRICAL MECHANISM PMD P.C. board 4592Q Power supply motor P.C. board 4593Q BAS-311G, BAS-326G...
  • Page 122 8. ELECTRICAL MECHANISM Panel P.C. board 4594Q BAS-311G, BAS-326G...
  • Page 123: Symptoms When There Are Poor Connections

    Connector No. and position • The work clamp pulse motor operates, but the home position is not detected correctly. • [E300] is displayed. 5242Q • The work clamp pulse motor does not operate. • [E300] or [E301] is displayed. 4712Q BAS-311G, BAS-326G...
  • Page 124 Connector No. and position • Power indicator does not illuminate and sewing machine does not operate. • Operation is unstable. 5244Q • [E403] is displayed when the power is turned on and the sewing machine does not start. 4717Q BAS-311G, BAS-326G...
  • Page 125 Work clamp drops when work clamp switch (left) is depressed Home position is detected and sewing machine starts when start switch (right) is depressed 5247Q • After the power is turned on, [E055] is displayed. 5248Q • After the power is turned on, [E452] is displayed. 5249Q BAS-311G, BAS-326G...
  • Page 126: Troubleshooting

    8. ELECTRICAL MECHANISM 8-5. Troubleshooting 8-5-1. Diagnosis flowchart Description of symbols Manual procedure Setting and status Switch operation Continued on previous/next page Judgment Power switch OFF “Problem” symbol in the “8-5-2. Remedy” lists 5250Q BAS-311G, BAS-326G...
  • Page 127 8. ELECTRICAL MECHANISM 5251Q BAS-311G, BAS-326G...
  • Page 128 8. ELECTRICAL MECHANISM 5252Q BAS-311G, BAS-326G...
  • Page 129 8. ELECTRICAL MECHANISM 5253Q BAS-311G, BAS-326G...
  • Page 130: Remedy

    1. With the power turned off, check that all of the connectors are securely connected by referring to “8-4. Description of connectors”. 2. Use the flowchart to check what sort of conditions the problem occurs under (#*). 3. Carry out the inspections for the problems in the order of the numbers in the “Cause” column. BAS-311G, BAS-326G...
  • Page 131 1-2, 3-4 and 5-6 of the 6-pin connector coming out from the transformer. [Fig. C] 3) OK if there is continuity between pins 4878Q 1-2 and 4-5 of the 5-pin connector coming out from the transformer. [Fig. D] 4879Q BAS-311G, BAS-326G...
  • Page 132 After measuring, turn off the power. 5085Q 7. Malfunction of panel P.C. board Check that connector P1 (PANEL) is inserted Panel P.C. board into the main P.C. board, and that connector Panel harness CN2 (MAIN) is inserted into the panel P.C. board. BAS-311G, BAS-326G...
  • Page 133 9. If [E740] is displayed, there is a 1) Check if there are any thread scraps blocking DC fan motor assembly malfunction of the cooling fan. the cooling fan. 2) Check that connector P22 (FAN) is inserted into the main P.C. board. BAS-311G, BAS-326G...
  • Page 134 Problem #6 Home position is incorrect. Cause Inspection/Remedy/Adjustment Replacement if a malfunction Incorrect home position adjustment Switch to home position adjustment mode, and adjust the position of the home position dog. (Refer to “7-20. Adjusting the home position”.) BAS-311G, BAS-326G...
  • Page 135 4) If it illuminates, the home position dog is incorrectly adjusted. Switch to home position adjustment mode, and adjust the position of the home position dog. (Refer to “7-20. Adjusting the home position”.) BAS-311G, BAS-326G...
  • Page 136 1-2 of the cord-side connector. OK if approx. +16 V After measuring, turn off the power, wait 5 minutes or more and then insert P2. 5) Check that connector P1 (MAIN) is inserted into the PMD P.C. board. 4884Q BAS-311G, BAS-326G...
  • Page 137 1. Incorrect work clamp home Adjust the home position while referring to “7-20. position adjustment Adjusting the home position”. 2. Incorrect mechanism adjustment Check if the movement of the work clamp arm is Work clamp arm assembly stiff. BAS-311G, BAS-326G...
  • Page 138 Remove fuse F2 from the power supply motor Fuse operate and [E300] is displayed, P.C. board and check the continuity. 6A-250V there is a blown fuse. OK if continuity (If there is no continuity, carry out the inspections in 2.) BAS-311G, BAS-326G...
  • Page 139 4) If it illuminates, the home position dog is incorrectly adjusted. Switch to home position adjustment mode, and adjust the position of the home position dog. Refer to “7-20. Adjusting the home position”. BAS-311G, BAS-326G...
  • Page 140 30 minutes. motor operates when the sewing 2) Turn the power back on; OK if operation is machine is operated at short normal. cycle. Avoid repeated sewing of sewing data that is less than 15 stitches. BAS-311G, BAS-326G...
  • Page 141 “7-14. Adjusting the work clamp lift amount”. 3) If there is play in the feed mechanism, adjust the feed mechanism. BAS-311G, BAS-326G...
  • Page 142 2) With connector P7 (SOL2) connected to the PMD P.C. board, turn on the power and carry out sewing, and measure the voltage between pins 1-2 of connector P7 (SOL2). OK if voltage is output momentarily at the sewing end. 4891Q BAS-311G, BAS-326G...
  • Page 143 P.C. motor P.C. board board PMD P.C. board, measure the voltage at the cord. OK if approximately 30 V DC between pins 3-4 4892Q 5. Malfunction of main P.C. board Main P.C. board 6. Malfunction of motor Motor BAS-311G, BAS-326G...
  • Page 144: Table Of Error Codes

    Check that connector P9 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-311G, BAS-326G...
  • Page 145 Work clamp raised or lowered position cannot be detected. E301 Turn off the power, and then check if there are any problems in the work clamp vertical direction. Problem with work clamp motor home position adjustment data. E303 Re-adjust the home position. BAS-311G, BAS-326G...
  • Page 146 Internal memory is full and copying is not possible. Clear the sewing data, or change the settings so that sewing data is not copied to internal memory when it is E474 loaded (memory switch No. 466 = ON). BAS-311G, BAS-326G...
  • Page 147 Turn off the power, and then check if the cooling fan is blocked with scraps of thread. E740 Check that connector P22 on the main P.C. board is properly connected. Check if the fuse (F6) is blown. If an error code that is not listed above appears, contact the place of purchase. BAS-311G, BAS-326G...
  • Page 148: Troubleshooting

    Refer to "Skipped stitches occur". P. 142 the needle. start. Instruction Upper thread length is irregular. Adjust the sub-tension. manual Position of shuttle race thread guide is Adjust the position of the shuttle race P. 92 incorrect thread guide. BAS-311G, BAS-326G...
  • Page 149 Needle and rotary hook timing is Adjust the needle bar lift amount. P. 91 incorrect. Shuttle race thread guide Adjust the position of the shuttle race P. 92 separating the threads. thread guide. BAS-311G, BAS-326G...
  • Page 150 Adjust the position of the machine head P. 88 Machine head switch does not work. depressed. switch. machine head switch malfunctioning, replace it with a new one. BAS-311G, BAS-326G...
  • Page 151: Segment Display

    11. 7-SEGMENT DISPLAY 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z BAS-311G, BAS-326G...
  • Page 152 SERVICE MANUAL http://www.brother.com/ 15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone: 81-52-824-2177 Printed in Japan BAS-311G, BAS-326G I5060885B 2005.07. B (1)

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