Baby Lock Mid-Line Machines Technical Training Manual
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Baby Lock Mid-Line Machines Technical Training Manual

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Technical Training Manual for
the "Mid-Line Machines"

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Summary of Contents for Baby Lock Mid-Line Machines

  • Page 1 Technical Training Manual for the “Mid-Line Machines”...
  • Page 4 Outline of Mechanism Main mechanisms ............. 1 - 2 Driveline ..............1 - 3 Positions of electronic components......1 - 5 Control system block diagram........1 - 7 Layout for PCB connectors ........1 - 8 Operation of other electronic components ....1 - 10 1 - 1...
  • Page 5 Outline of Mechanism Main mechanisms Main body Bobbin winder mechanism Upper shaft mechanism Thread tension mechanism Needle bar / Presser foot mechanism Side feed mechanism Lower shaft mechanism Thread cutting mechanism Feed / Rotary hook mechanism Embroidery unit X driving gear & pulley Y guide shaft Y belt X guide shaft...
  • Page 6 Outline of Mechanism Driveline (A) Up and down movement of needle bar, movement of thread take-up lever and zigzag movement of needle bar mechanism Thread take-up Upper shaft Pulley counter weight Needle bar crank Thread take-up lever Needle bar crank rod Needle bar block Needle bar Needle bar...
  • Page 7 Outline of Mechanism Driveline (B) Movement of feed dog and rotary hook Timing pulley D Timing belt Upper shaft pulley Upper shaft Pulley Feed module Lower shaft gear Lower shaft Feed adjuster F pulse motor Outer rotary hook Feed arm B Feed arm A Vertical lever Vertical adjusting screw...
  • Page 8 Outline of Mechanism Positions of electronic components Main body Bobbin winder switch Main PCB SS-VR (Start/Stop switch and Variable Resistance) PCB Needle position sensor Presser foot pulse motor initial sensor PCB LCD module Presser foot pulse motor Touch panel LED pointer jack Static electricity switch PCB Cloth thickness...
  • Page 9 Machine Cover Removal...
  • Page 10 Top Cover and Face Plate Remove Top Cover. Remove 2 Screws “ A “ and slide faceplate to the left...
  • Page 11 Free Arm Cover and Tension Cover Remove screw “ B “ and Free Arm Cover Remove screw “ C “ and Tension Unit Cover...
  • Page 12 Free Arm Front Cover and Base Cover Remove screw “ D “ and loosen screw “ E ”. Pull forward and down to remove cover. Remove 2 Screws “ F “ and slide cover up and to the left.
  • Page 13 Front Panel Cover Remove 3 Screws “ G “ and slide faceplate to the left Loosen Screw “ H “...
  • Page 14 Front Panel Cover ( Continued ) Release Locking Hooks “ I “ Release Locking Hook “ J “...
  • Page 15 Front Cover Connectors Disconnect Cable “ K “ from the Main PC Board Disconnect Ground Cable “ L “ from the Main PC Board.
  • Page 16 Rear Cover Remove Screw “ M “ Remove Screw “ N “, and detach Tabs “ O “ from the Base Plate...
  • Page 17 Basic of Disassembly Lower driving mechanism Lower driving mechanism location diagram 2 - 21...
  • Page 18 Basic of Disassembly Main frame and Covers Removal of Base plate assembly 1. Unlock the lock to disconnect the inlet lead wire from the power unit lead wire.  Refer to 3 - 18 "Disassembly of Base plate assembly". 2. Remove the three screws (taptite, bind S M4x10) to remove the base plate assembly. 3.
  • Page 19 Basic of Disassembly Lower driving mechanism Removal of Tension pulley assembly and Belt supports 1. Remove the screw (screw, pan (S/P washer) M4x10) to remove the tension pulley assembly. 2. Remove the two screws (screw, pan (S/P washer) M3x6) to remove the belt support upper adjust from the belt support upper.
  • Page 20 Basic of Disassembly Lower driving mechanism Removal of Side feed assy 1. Remove the screw (screw, bind M3x6) to remove the spring plate B and the washer from the side feed adjust plate. 2. Remove the two screws (taptite, bind S M4x10) to remove the side feed assy. ...
  • Page 21 Basic of Disassembly Lower driving mechanism Removal of Feed module 1. Cut the band to release the lead wires from the securing fixtures of free arm front cover plate. 2. Remove the two screws (taptite, bind S M4x10) to remove the free arm front cover plate. 3.
  • Page 22 Basic of Disassembly Lower driving mechanism Removal of Thread cutter module 1. Remove the screw (screw, bind M3x4) to remove the feed unit insulation sheet. Release the lead wires from the feed unit insulation sheet, and release it from the securing fixtures. 2.
  • Page 23 Basic of Assembly Lower driving mechanism Lubrication Lubrication point Lubricating oil type Quantity of lubrication Felt 1 place FBK OIL RO 100 1 - 2 drops Lower shaft bushing R 1 place FBK OIL RO 100 1 - 2 drops Felt Lower shaft bushing R 2 - 34...
  • Page 24 Hook and Feed Module ( note ) When reinstalling the Hook and Feed Module, assure that the Timing dot on the Hook is facing to the front of machine ( 6:00 position ), and the Feed Dog’s are in the up position when the needle is at it’s Top Dead Center position.
  • Page 25 Basic of Assembly Lower driving mechanism Attachment of Feed module 1. Set the felt. 2. Hang the T belt on the timing pulley D. Set the feed module to the mounting position, and secure it with the two screws (stud screw M4) and screw (screw, pan (S/P washer) M3x12). ...
  • Page 26 Basic of Assembly Lower driving mechanism Attachment of Side feed assy 1. Attach the side feed assy with the two screws (taptite, bind S M4x10).  Refer to 3 - 163 "Side feed module". 2. Set the boss A of side feed assy to the side feed adjust plate, set the washer to the side feed adjust plate, align the notch of spring plate B with the boss B, and attach the spring plate B to the side feed adjust plate with the screw (screw, bind M3x6).
  • Page 27 Basic of Assembly Lower driving mechanism Attachment of Belt supports and Tension pulley assembly 1. Set the belt support upper adjust to the belt support upper, and tighten the two screws (screw, pan (S/P washer) M3x6) temporarily. *Key point • Fully tighten the screw after performing "Adjustment of Timing belt and belt support upper/lower clearance".
  • Page 28 Basic of Assembly Main frame and Covers Attachment of Base plate assembly 1. Attach the inlet assy to the base plate assembly with the screw (screw, bind M4x6). 2. Attach the base plate assembly with the three screws (taptite, bind S M4x10). 3.

  • Page 29: Table Of Contents

    Adjustment Inspection Needle point damage ..........4 - 2 Test Mode Start test mode ............4 - 3 Adjustment Touch panel............. 4 - 4 Timing belt tension ..........4 - 5 Timing belt and belt support upper/lower clearance ..4 - 6 Motor belt tension............

  • Page 30: Inspection Needle Point Damage

    Inspection Needle point damage 1. Put a needle on the level block, and check the needle is not bent. The gap with the block should be even. Level block 2. Slide a needle on your finger and check it moves smoothly. 4 - 2...
  • Page 31 Adjustment Touch panel [Standard] “SUCCESS” should be displayed after touching five “+” on touch panel setting screen by touch pen in numerical order. [Adjustment] 1. Turn off the machine. 2. Turn on the machine while touching screen by touch pen or fingers. *Key point •...

  • Page 32: Test Mode Start Test Mode

    Test Mode Start test mode Turn on the machine while pressing (Needle position button) and (Thread cutter button) to start (test mode selection screen appears). Thread cutter button Needle position button Test mode selection screen 4 - 3...
  • Page 33 Maintenance How to reset counter of the maintenance When the operating time of the machine reaches 500 hours, the maintenance message (MSG) will be displayed on the LCD. And then do the maintenance according to the instructions of 6-4 to 6-7, and finally reset the hour counter according to the following instructions.

  • Page 34: Timing Belt Tension

    Adjustment Timing belt tension [Standard] 3.5 ±0.5 mm (3 to 4 mm) slack should be made by pushing the timing belt at the middle of upper shaft pulley shaft and tension pulley shaft with a force of 1.96 N (200 gf). [Adjustment] 1.

  • Page 35: Timing Belt And Belt Support Upper/Lower Clearance

    Adjustment Timing belt and belt support upper/lower clearance [Standard] The clearance between the timing belt and the belt support upper adjust of belt support upper should be 0.1 to 0.3 mm. The clearance between the timing belt and the belt support lower adjust should be 0.1 to 0.3 mm.

  • Page 36: Motor Belt Tension

    Adjustment Motor belt tension [Standard] 4.5 ± 0.5 mm (4 to 5 mm) slack should be made by pushing the motor belt at the middle of timing pulley shaft and motor T-pulley shaft with a force of 0.98 N (100 gf). [Adjustment] 1.
  • Page 37 Adjustment Lower thread tension (standard inner rotary hook assy) The lower thread tension shown in this adjustment is factory set. Its optimum value may vary depending on conditions of use by user. [Standard] When the schappe spun thread #60 is pulled from the standard inner rotary hook assy* slowly with the tension gauge, the thread tension should be 0.1 to 0.12 N (10 to 12 gf).

  • Page 38: Fine Tension

    Adjustment Fine tension [Standard] Start test mode, pass the schappe spun thread #60 through tension plate from thread guide and pull it slowly by tension gauge. The tension should be adjusted in 0.06 to 0.09 N (6 to 9 gf). [Adjustment] 1.

  • Page 39: Upper Thread Tension

    Adjustment Upper thread tension [Standard] Start test mode, pass the schappe spun thread #60 through the thread guide, tension plate, tension disk A/B and plate assembly, and pull it slowly by tension gauge. The tension should be adjusted in 0.54 to 0.64 N (55 to 65 gf). [Adjustment] 1.
  • Page 40 Needle Presser/Feed Module Adjustment With the “ J ” foot attached, make sure the opening of the foot lines up with the opening of the Needle Plate. If not adjust the 6 mm adjusting nut to correct. Always make sure the Phillips screw remains tight.

  • Page 41: Left Base Line Needle Drop

    Adjustment Left base line needle drop [Standard] In the test mode #04, needle point (left base line) should be drop in the right side of “V” groove on needle plate A assy. [Adjustment] 1. Remove the face plate assy. (Refer to “2-6”.) 2.

  • Page 42: Needle Bar Rising

    Adjustment Needle bar rising [Standard] The right edge of the needle should be coincided with the outer rotary hook point when raising needle bar 3.1 ± 0.2 mm (2.9 to 3.3 mm) up from its lowest position at the left base line. [Adjustment] 1.

  • Page 43: Needle Bar Height

    Adjustment Needle bar height [Standard] The gap between the top of needle eye and the lower end of the outer rotary hook point should be 1.2 ±0.2 mm (1 to 1.4 mm) when the right edge of the needle is coincided with the outer rotary hook point at the left base line.

  • Page 44: Needle Clearance

    Needle / Hook Clearance In test mode 4, check needle clearance in all 3 needle points. Adjust screw “ P ”...
  • Page 45 Adjustment Needle clearance left/right [Standard] In the test mode #04, clearance between the needle point and the outer rotary hook point should be same at the base line of both left and right. [Adjustment] 1. Remove the face plate assy. (Refer to “2-6”.) 2.

  • Page 46: Needle Threader

    Application of Needle-presser module Disassembly Removal of Threader hook assy 1. Remove the retaining ring E2.5 from the needle threader shaft A of needle bar supporter assy, release the hook part of spring from the thread guide assy, and then pull out the threader hook assy. Disassemble the threader hook assy, link A assy, link B and thread guide assy, and remove the spring (XC9616) from the thread guide assy.

  • Page 47: Needle Bar Release

    Adjustment Needle threader [Standard] When passing the threader hook into the needle eye, clearance between the upper edge of the threader hook and the upper edge of the needle eye should be 0 mm. [Adjustment] 1. Remove the face plate assy. (Refer to “2-6”.) 2.
  • Page 48 Adjustment Inner rotary hook bracket position [Standard] The overlap between the spring plate of the inner rotary hook bracket assy and the protrusion A of the inner rotary hook assy in the front/back direction should be 1.7 ±0.1 mm (1.6 to 1.8 mm). [Adjustment] 1.

  • Page 49: Presser Bar Height

    Adjustment Presser bar height [Standard] When raising the presser foot, clearance between the upper surface of the needle plate A assy and bottom surface of the presser foot should be 6 to 6.5 mm. The presser foot should be in parallel with the feed dog hole of the needle plate A assy. [Adjustment] 1.

  • Page 50: Fabric Thickness Setting

    Adjustment Fabric thickness setting [Standard] In the test mode #02, set the fabric thickness: 0 mm and 3 mm. [Adjustment] 1. Remove the needle. 2. Attach the presser foot “J”. 3. Start the test mode, and then select the #02 (Fabric thickness setting mode). 4.

  • Page 51: Feed Dog Height And Parallelism

    Adjustment Feed dog height and parallelism [Standard] • When the feed dog is at its highest position, the feed dog height from the surface of the needle plate A assy should be 1 ±0.1 mm (0.9 to 1.1 mm). • When the feed dog is at its lowest position, the feed dog should be lowered more than 0.3 mm from the surface of the needle plate A assy.
  • Page 52 Adjustment Feed dog height and parallelism <From previous page> 6. Loosen the screw B of the feed dog correction plate. (Fig.2) 7. Turn the screw C of the feed bar assy to adjust the parallelism of the feed dog and the needle plate A assy surface. (Fig.3) *Key point •...

  • Page 53: Front/Back And Left/Right Position Of Feed Dog

    Adjustment Front/back and left/right position of feed dog [Standard] When the feed dog is located in the center position and the test mode #06 is operated: • The clearance (front to back) between the forward edge of the feed dog middle tooth and the needle plate A assy should be 3.3 ±0.3 mm (3.0 to 3.6 mm).
  • Page 54 Adjustment Feed forward/backward [Standard] The difference in length of 100 forward stitches and 100 backward stitches should be within ±5 mm when test mode #13 is operated. [Adjustment] 1. Remove the needle plate B assy, the free arm cover and the free arm front cover assy. (Refer to “2-5”.) 2.

  • Page 55: Feed Forward/Backward

    Adjustment Feed forward/backward <From previous page> If the difference in length of 100 forward stitching and 100 reverse stitching is not within  ±5 mm, adjust it by following the procedures below. 1. Insert the hex wrench (2.5 mm) into the hole of rear cover, and then loosen the screw A of the FPM holder. (Fig.1) Loosen the screw A of the FPM holder.

  • Page 56: Side Feed Straight Stitch

    Adjustment Side feed straight stitch [Standard] In the test mode #36, (1) Pattern should be horizontal and the sewing length at the upper section should be 26 to 31 mm. (Fig.1) (2) Right top margin of the pattern should be 4 to 6 mm. (Fig.2) (3) The deviation of sewing length for upper line and lower line should be less than 1 mm.

  • Page 57: One Point

    Adjustment One point [Standard] One point pattern sewn by the test mode #3 should not be overlapped, opened, or shifted. [Adjustment] 1. Attach the presser foot “N”. 2. Start the test mode, and then select the #03 (Pattern Adjustment mode). 3.

  • Page 58: Bh Lever Switch Position

    Adjustment BH lever switch position <From previous page> 9. Start the test mode, and then select the #16 (Switch monitoring mode). 10. Turn the BH eccentric shaft left to stop the buzzer sound. (Fig.3) 11. Turn the BH eccentric shaft right to return it to the position starts buzzer sound.

  • Page 59: Belt Tension (Embroidery Unit)

    Adjustment Belt tension (embroidery unit)  X timing belt [Standard] The pushing force to make 6 mm slack at the center of the X timing belt should be 2.36 to 2.54 N (240 to 260 gf). [Adjustment] 1. Loosen the 2 screws A of the tension pulley assy. 2.

  • Page 60: Carriage Height (Embroidery Unit)

    Adjustment X carriage height (embroidery unit) [Standard] The clearance between the ES main cover assy and the E hoop stay plate assy should be 3.5 ±0.2 mm (3.3 to 3.7 mm). [Adjustment] 1. Attach the embroidery unit to the machine. *Note •...
  • Page 61 Adjustment Embroidery center position (embroidery unit) [Standard] In the test mode #23, the needle point should drop into the center of embroidery sheet hole when the needle is lowered by pressing the button on the screen. [Adjustment] 1. Remove the presser foot. 2.

  • Page 62: Embroidery Center Position (Embroidery Unit)

    Adjustment Embroidery center position (embroidery unit) <From previous page>  If the needle point doesn't drop into the hole on the center of the embroidery sheet, adjust the needle point position according to procedures below. 1. Select the #08 (Embroidery Position Adjust mode). 2.

  • Page 63: F Pulse Motor Phase

    Adjustment F pulse motor phase This adjustment must be operated when: • Feed module is replaced. • F INIT PCB assy or F pulse motor is replaced or reassembled. [Standard] Press the button on the test mode #31 screen while the needle bar is lowered and the (presser foot lifter button) is pressed.
  • Page 64 Troubleshooting for Electronic Parts Error message list ............5 - 2 Error is displayed ............. 5 - 3 Replacement of main PCB assy or panel PCB assy ..5 - 7 Correspondence table of “Model” and “Printed-circuit board” ... 5 - 8 5 - 1...
  • Page 65 Troubleshooting for Error message list Electronic Parts If any message listed below is displayed on the screen of the machine, an error might have been occurred in the machine. Identify the location with the problem by following the procedures in the reference page and repair it. Error Message Refer to: MAIN MOTOR SPEED...
  • Page 66 Troubleshooting for Error is displayed Electronic Parts "F01" is displayed. After the power supply unit is replaced, does the main motor Replace the main PCB assy. correctly rotate in test mode "#14"? 5 - 3...
  • Page 67 Troubleshooting for Error is displayed Electronic Parts "F05" or "F06" is displayed. Is the NP PCB assy correctly connected to the main PCB assy Connect it properly. (CN22)? When the NP PCB assy is replaced with a new one, does it work Replace the main PCB assy.
  • Page 68 Troubleshooting for Error is displayed Electronic Parts "F07" is displayed. Is the SSVR PCB assy correctly connected to the panel PCB assy Connect it properly. (CN1)? Replace the SSVR PCB assy. 5 - 6...
  • Page 69 Troubleshooting for Replacement of main PCB assy or panel PCB assy Electronic Parts Do not replace the main PCB assy and panel PCB assy simultaneously. The setting data required to run the sewing machine correctly is stored in both the main PCB assy and panel PCB assy.
  • Page 70 © Tacony Corp 1/2016, all rights reserved...

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