Brother LK3-B430E Mark II Service Manual
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Brother LK3-B430E Mark II Service Manual

Brother LK3-B430E Mark II Service Manual

Electronic lockstitch bar tracker e series
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LK3-B430E
SERVICE MANUAL
Please read this manual before making any adjustments.
ELECTRONIC LOCKSTITCH BAR TACKER

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Summary of Contents for Brother LK3-B430E Mark II

  • Page 1 LK3-B430E SERVICE MANUAL Please read this manual before making any adjustments. ELECTRONIC LOCKSTITCH BAR TACKER...

  • Page 2: Safety Instructions

    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. If you have any questions regarding this product, please contact a Brother dealer. SAFETY INSTRUCTIONS 1.
  • Page 3 Furthermore, do not excessively bend the cords or secure them too firmly with staples, Contact your Brother dealer or a qualified electrician otherwise there is the danger that fire or electric shocks for any electrical work that may need to be done.

  • Page 4: Maintenance And Inspection

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

  • Page 5: Warning Labels

    The following warning labels appear on the sewing machine. Please follow the instructions on the labels at all times when using the machine. If the labels have been removed or are difficult to read, please contact your nearest Brother dealer. Hazardous voltage Hochspannung Un voltage non adapté...

  • Page 6: Table Of Contents

    5-3. Thread wiper mechanism (1) ......26 7. GAUGE PARTS LIST ACCORDING TO SUBCLASSES ........51 5-4. Thread take-up mechanism ......27 5-5. Presser mechanism ........28 8. OPTIONAL PARTS ........56 5-6. Feed mechanism .......... 30 LK3-B430E Mark II...
  • Page 7 10-10. Confirming software version ..... 74 10-11. Table of error codes ........75 10-12. Troubleshooting flowchart ......77 10-12-1. Troubleshooting flowchart ..... 77 10-12-2. Problem solution and measures .... 80 10-13. Control circuit block diagram ....91 LK3-B430E Mark II...

  • Page 8: Program List

    Specifica- No. of Standard bar Standard bar Program No. Sewing pattern tion stitches tacking length tacking width 16mm 16mm 10mm For ordinary materials 10mm 10mm 20mm 20mm 16mm 16mm For denim 16mm 24mm 24mm 24mm LK3-B430E Mark II...
  • Page 9 Program No. Sewing pattern stitches tacking length tacking width 10mm 0.3mm 10mm 0.3mm 20mm 0.3mm 25mm 0.3mm 25mm 0.3mm 25mm 0.3mm * Use the presser foot and feed plate for straight bar tacking when using the above programs. LK3-B430E Mark II...
  • Page 10 10mm Vertical bar tacking 10mm 0.3mm 10mm vertical 0.3mm 10mm straight bar tacking 0.3mm 10mm * Use the presser foot and feed plate for straight bar tacking when using the above programs. LK3-B430E Mark II...

  • Page 11: Standard Thread Tension

    * When the spring height (stroke) is great or the spring tension is insufficient, it may cause the thread end length to vary after thread trimming. LK3-B430E Mark II...

  • Page 12: Mechanical Descriptions

    5. The crank rod i moves the rock gear o back and forth. 6. The motion of the rock gear o causes the lower shaft gear !0 to oscillate. Resultantly, the driver !2 and the shuttle hook !3 in the shuttle hook mechanism oscillate. LK3-B430E Mark II...

  • Page 13: Work Clamp Lifter Mechanism

    ! 0 . 3. When the presser solenoid is turned off, the presser plate q rises, and work clamps R and L t lower. Simultaneously, the thread wiper !2 operates in the opposite direction. LK3-B430E Mark II...

  • Page 14: Feed Mechanism

    !5 . When feed cam X !2 moves, the feed bracket i oscillates, pivoting on the tack width lever shaft u. Sewing patterns are created through combinations of X and Y movements shown above. LK3-B430E Mark II...

  • Page 15: Thread Trimmer Mechanism

    4. The thread trimmer rod i moves the connecting rod lever ! 0 via the thread trimmer lever o. 5. The thread trimmer connecting rod !1 attached to the connecting rod lever !0 operates, and the movable knife !2 slides on the fixed knife !3 to trim the thread. LK3-B430E Mark II...

  • Page 16: Thread Nipper Mechanism

    4. The tension release lever (U) r moves the tension release lever y via the tension release rod assy t. 5. The tension release lever y pushes the tension release bar u. 6. The end of the tension release bar u pushes the pin i. LK3-B430E Mark II...

  • Page 17: Thread Take-Up Mechanism

    2. The crank shaft e engaged with the solenoid joint w turns in the direction of the arrow. 3. The thread take-up lever r engaged with the crank shaft e operates in the direction of the arrow. LK3-B430E Mark II...

  • Page 18: Disassembly

    4. Remove the stud screw u and the washer i on each side, and the shuttle race cover o. 5. Remove the bolt !0 , spring washer !1 , the washer !2 , and tension pulley !3 . LK3-B430E Mark II...

  • Page 19: Presser Arm Mechanism

    7. Remove the slide block @2 from the pin. 4-3. Shuttle hook mechanism 1. Remove the bobbin case q by pulling its release lever. 2. Open the setting claw w on each side, and remove the shuttle race e along with the shuttle hook r. LK3-B430E Mark II...

  • Page 20: Needle Bar Mechanism

    6. Remove the rubber cap ! 4 , the screw ! 5 , and the needle bar guide t. * Do not remove them if possible to prevent the machine from overheating due to needle bar rubbing. LK3-B430E Mark II...

  • Page 21: Upper Shaft Mechanism

    8. Remove the upper shaft r in the direction of the arrow. * After that, remove the thread take-up crank q, the washer ! 8 , the bobbin winder pulley ! 1 , and the thread trimmer cam ! 2 from the upper shaft r, in this order. LK3-B430E Mark II...

  • Page 22: Lower Shaft Mechanism

    6. Untie the wick i, loosen the set screw of the set screw collar o, and remove the rock gear shaft !0 from the rear of the machine. 7. Remove the set screw collar o, the rock gear ! 1 , and the crank rod ! 2 . LK3-B430E Mark II...

  • Page 23: Feed Mechanism

    6. Remove the X feed lever o by lifting it in the direction of the arrow. 7. Remove the screw ! 0 and home position sensor X ! 1 . 8. Remove the screw !2 , the cord support !3 , and home position sensors Y u and X !1 . LK3-B430E Mark II...
  • Page 24 5. For the X direction, remove the screw i, the feed cam bracket o, feed cam X ! 0 , coupling hub 8 ! 1 , and the feed home position dog !2 by lifting them from above. 6. Repeat step 5 for the Y direction. LK3-B430E Mark II...
  • Page 25 3. Loosen the set screw u and remove coupling hub 8 y from the cam shaft i. 4. Loosen the set screw o, and remove the cam shaft i. 5. Remove the feed cam ! 0 from the feed cam bracket ! 1 . LK3-B430E Mark II...

  • Page 26: Presser Mechanism

    7. Remove the two rubber caps ! 6 , and the two screws ! 8 of the solenoid setting plate, B ! 7 . 8. Remove the four screws @ 0 of the solenoid setting plate, A ! 9 , and the presser foot lifter solenoid @ 1 . LK3-B430E Mark II...

  • Page 27: Thread Wiper Mechanism

    5. Remove the thread wiper assembly !1 and the thread wiper driving lever !3 by lifting them upward. 6. Loosen the set screw ! 4 , and remove the thread wiper link ! 5 and the thread wiper arm ! 6 by pulling them downward. LK3-B430E Mark II...

  • Page 28: Thread Nipper Mechanism

    3. Loosen the set screw !2 , and remove the presser bar lifter lever shaft !3 , collar 13 !4 and tension release lever y. 4. Remove the screw !5 , the washer !6 , and the presser bar lifter lever !7 . 5. Remove the presser bar lifter crank !8 in the direction of the arrow. LK3-B430E Mark II...

  • Page 29: Thread Take-Up Mechanism

    5. Remove the two stud screws ! 2 , and the thread take-up lever ! 3 . 6. Remove the retaining ring ! 4 , the crankshaft ! 5 and the washer ! 6 . LK3-B430E Mark II...

  • Page 30: Thread Trimmer Mechanism

    7. Loosen the set screw ! 9 , and remove the lever shaft @ 0 and the thread trimmer lever @ 1 . 8. Return the machine head to its original position, and remove the connecting rod lever @ 2 and the thread trimmer driving lever @ 3 . LK3-B430E Mark II...

  • Page 31: Assembly

    @ 1 and the nut @ 3 . 9. Attach the spring hook @3 to the inside of the machine, and connect the thread trimmer return spring @4 to 10. Return the machine head to its original position. LK3-B430E Mark II...

  • Page 32: Thread Nipper Mechanism

    ! 2 to the driving lever stopper ! 3 using the stud screw ! 0 . *Apply grease to the engagement portion of the stud screw !0 . 4. Attach the rubber cap ! 4 . LK3-B430E Mark II...

  • Page 33: Thread Wiper Mechanism (1)

    If there is no thrust in the thread wiper rod assembly w or the thread wiper mechanism operation is sluggish, it may be due to the operation of the presser plate (shown on page 28), and error E-60 may be displayed. LK3-B430E Mark II...

  • Page 34: Thread Take-Up Mechanism

    If the movement is stiff, loosen the two screws ! 6 and make fine adjustments to the position of the solenoid setting plate y so that the thread take-up lever r can operate smoothly. LK3-B430E Mark II...

  • Page 35: Presser Mechanism

    11. Attach the two springs @ 5 to link shaft B r and the two pins @ 6 . * Press the presser lifter link-related parts e by hand to make sure that they can move easily. 12. Attach the rubber caps @ 7 and @ 8 . LK3-B430E Mark II...
  • Page 36 2. Sliding portions of the presser arm lever w and presser arm levers R and L e 3. Round portion of the presser arm lever plate r 4. Bearing ball of the presser arm support shaft t LK3-B430E Mark II...

  • Page 37: Feed Mechanism

    4. Fit the feed home position dog i on coupling hub 8 t, and tighten the screw o in the center of the slot. 5. Fit coupling hub 6.35 !1 on the shaft of the pulse motor !0 , and tighten the set screw !2 until the shaft is protruding 2.5 mm. LK3-B430E Mark II...
  • Page 38 5. Adjust the angle of coupling hub 6.35 !2 of the pulse motor, Y !1 to that of the coupling spacer q. Pass the former through the machine wall, and secure it using the screw !3 . 6. Return the machine head to its original position. 7. Apply grease to the circumference of the feed cam e. LK3-B430E Mark II...
  • Page 39 11. Insert the wicks @ 4 and @ 5 of the X feed lever q and the Y feed lever o into the hole @ 6 for lubrication. * Do not allow the wicks to make contact with the connecting rod lever @ 7 . LK3-B430E Mark II...

  • Page 40: Upper Shaft Mechanism

    5. Attach the synchronizer ! 0 to the machine using the screw ! 1 . 6. Attach the pulley !2 leaving a 0.5 mm clearance from the protrusion of the synchronizer !0 , tighten the set screw ! 3 that comes later when rotating to the screw flat. LK3-B430E Mark II...

  • Page 41: Needle Bar Mechanism

    8. Attach the oil cap ! 6 and the rubber caps ! 7 , ! 8 , and ! 9 . 9. Insert the wick @0 extending from the thread take-up support stud e into the lubrication hole @1 . LK3-B430E Mark II...

  • Page 42: Lower Shaft Mechanism

    0.05 - 0.12 mm play of the driver !0 . 10. Pass the wick ! 7 through the rock gear shaft q, and knot it on the end. 11. Return the machine head to its original position. LK3-B430E Mark II...

  • Page 43: Thread Trimmer Mechanism (2)

    B on the needle plate when the sewing machine in the stopped position and the movable knife !3 is moved toward the index mark. 7. Return the machine head to its original position. LK3-B430E Mark II...

  • Page 44: Thread Wiper Mechanism (2)

    2. Make sure that the thread wiper w is positioned 30 mm to the left from the center of the needle bar when link C q is fully pressed. If it is not, remove the rubber cap y, loosen the set screw u, and adjust the thread wiper position. LK3-B430E Mark II...

  • Page 45: Shuttle Race Mechanism

    * Place it as shown in the illustration so as not to clamp the felt !8 , and then gently press the felt !8 and the wick !9 until they are at the same height as the rotary hook race. * Return the support @0 to its original position. LK3-B430E Mark II...

  • Page 46: Presser Arm Mechanism

    @ 2 and @ 3 little by little.Then tighten the screws @ 0 and @ 1 , and perform u for positioning. * At this time, the clearance between the feed home position dog and the sensor sensing surface should be 0.1 - 0.5 mm. 9. After adjustment is completed, turn off the power. LK3-B430E Mark II...

  • Page 47: Covers

    7. Attach the belt cover ! 7 while inserting part A into the top cover ! 1 , and tighten the screws ! 8 and ! 9 . 8. While lightly pressing the top of the belt cover !7 in the direction of the arrow, tighten the screw !2 . LK3-B430E Mark II...

  • Page 48: Adjustment

    * When returning the felt support e, place it as shown in the illustration so as not to clamp the felt t, and then gently press the felt t and the wick y until they are at the same height as the rotary hook race. * Return the support w to its original position. LK3-B430E Mark II...

  • Page 49: Adjusting The Driver Needle Guard

    2. While pushing the shuttle race thread guide ! 0 in the direction of the arrow, adjust the position of the shuttle race thread guide !0 so that the needle is central in the needle groove of the shuttle race thread guide ! 0 . LK3-B430E Mark II...

  • Page 50: Adjusting The Work Clamp Lift Amount

    4. Remove the rubber cap !1 , and loosen the set screw !2 to adjust the position of the thread wiper so that it is positioned to the right approximately 20 mm from the center of the needle bar. LK3-B430E Mark II...

  • Page 51: Adjusting The Thread Take-Up Amount

    Loosen the nut w and move the connecting rod lever e to the left or right to adjust so that the V section A is aligned with the index mark B on the needle plate when the sewing machine in the stopped position and the movable knife q is moved toward the index mark. LK3-B430E Mark II...

  • Page 52: Replacing The Movable And Fixed Knives

    D. Turn the movable knife (in the direction of the arrow) while the screw is still loosened. Repeat above steps A, B, C and D four or five times to maintain the cutting performance of the knife. LK3-B430E Mark II...

  • Page 53: Adjusting The Driving Lever Stopper Position

    2. Turn the pulley to place the thread trimmer cam e with its non-operating portion facing upward. 3. Loosen the nut t. Move the screw y so that the roller r of the thread trimmer driving lever will return smoothly when it is put into the groove of the thread trimmer cam e. LK3-B430E Mark II...

  • Page 54: Adjusting The Thread Trimming Solenoid Position

    1. Loosen the set screw q, and turn the rock gear shaft w to adjust the play at the end of the driver e to 0.05 - 0.12 mm 2. After adjustment, move the rock gear shaft w to the left and right so that the pulley can rotate easily, and tighten the set screw q. LK3-B430E Mark II...

  • Page 55: Adjusting The Positions Of The Presser Solenoid

    4. Press the link C assy r in the presser lifter mechanism. When the wiper t is 5 mm away toward the right from the needle y, the presser signal should be ON. Loosen the screw i of the sensor perceive plate u, and move the sensor perceive plate u back or forth to adjust it. LK3-B430E Mark II...

  • Page 56: Adjusting The Home Position

    * The screw y at the “D” mark is an adjusting screw for the needle down detection function and is ad- justed to match the feed timing, so it should not be loosened. * The screw u is a screw for detecting the machine stop position, and should not be loosened. LK3-B430E Mark II...

  • Page 57: Adjusting The V Belt Tension

    3. Adjust the right tension pulley so that there is a gap of about 1 mm between it and the V-belt. * When the belt tension is weak, the following problems will occur; • Noise & vibration become large. • Needle up stop position becomes unstable. • Error code [E-50] is displayed. LK3-B430E Mark II...

  • Page 58: Gauge Parts List According To Subclasses

    159612-001 A S15667-001 LA Bobbin 159613-051 159613-051 S15665-001 LA Shuttle hook book 152687-902 B 152685-903 A assy 152685-903 A S15663-991 LB S15662-992 LA Large shuttle hook 152686-101 B 152682-101 A Spring tension 107606-001 104525-001 Spring 144588-001 B 145519-001 LK3-B430E Mark II...
  • Page 59 (The actual sewing area has a 1.5 mm margin on every side; inside the lines which the dimensions indicate.) Spec. 153608-101 152777-001 152779-001 152779-001 154527-001 152778-001 152780-001 152780-001 Work clamp, U S49697-001 S49698-001 S49700-001 S49699-001 30.2 Feed plate LK3-B430E Mark II...
  • Page 60 S33747-001 (30mm) 153201-001 (For denim) 152777-001 (PM) S49695-001 (F) S33748-001 (30mm) 153202-001 (For denim) 152778-001 (PM) S49694-001 (F) Work clamp, U S49948-001 (30mm) S49949-001(For denim) S49943-001 (PL) S49696-001 (F) Feed plate 13.4 S49945-001(MS) 112.5 Feed plate LK3-B430E Mark II...
  • Page 61 Work clamp, U φ13 14.6 S49973-001 S49972-001 (For crescent bar (For circular stitching) tacking) Feed plate φ13 14.6 156006-001 017680-512 156006-001 017680-512 Work clamp, U Bolt * Separate programs must be created if using 14 or 15. LK3-B430E Mark II...
  • Page 62 S10212-101 S30925-001 φ1.6 φ4 φ10 φ1.6 φ2.6 φ2.2 φ2.6 φ3.4 -7 (For knitted φ2.6 -2 (For denim) materials) S10213-001 S30926-001 S49980-001 S30450-001 S25127-001 S34348-001 φ2.2 φ10 φ4.7 φ2.6 φ6.5 φ2.2 φ2.2 φ4 φ3.3 -1,-5 (For ordinary materials) LK3-B430E Mark II...

  • Page 63: Optional Parts

    Solenoid thread wiper ........... This wipes the thread independently of the work clamp operation. Thread take-up device ........... This ensures a longer upper thread trailing. (This thread take-up device is for denim material.) LK3-B430E Mark II...

  • Page 64: Troubleshooting

    Height of the tension Adjust the height of to one side sion stud stud the tension stud. Insufficient lower Improper position of Wound lower thread Adjust the height of thread wound bobbin presser amount. the bobbin presser. LK3-B430E Mark II...
  • Page 65 Skipped stitches occur. driver and needle needle guard. necessary. Replace needle Needle bent Needle curve with a new one. Reinstall the needle Needle improperly with its long groove Needle orientation installed facing the front. LK3-B430E Mark II...
  • Page 66 Adjust the position of Rotary hook thread guide does not separate the rotary hook thread guide position upper and lower threads. guide. Upper thread tension Turn the tension nut to Main tension is insufficient adjust the tension. LK3-B430E Mark II...
  • Page 67 V belt using the Tension pulley position of V-belt tension tension pulley. Unstable needle stop position See #18 "The machine ← does not stop with the Electrical trouble needle upper position after thread trimming" in the table in 10-12-2. LK3-B430E Mark II...

  • Page 68: Electric Mechanism

    Conversion transformer (depending on power supply voltage specification) The conversion transformer controls the power supply voltage to provide 220 V. Panel PCB DC fan motor Air inlet Power supply circuit board Main circuit board Operation panel Control box LK3-B430E Mark II...

  • Page 69: Fuse Explanation

    The power lamp is not lit, and nothing operates. (glass tube fuse, 6A-250V) Fuse 6A 153242-000 The power lamp is not lit, and nothing operates. (glass tube fuse, 6A-250V) Fuse Fuse No.1 No.3 Fuse No.2 Fuse No.4 Main circuit board mounting side Front panel LK3-B430E Mark II...

  • Page 70: Connectors

    Connector positions Outside of the control box For foot switch Main circuit board RSPORT P117 PANEL EXIN FOOT HEAD ORG1 ORG2 FAN2 SYNCHRO SELECT DC18 POWER FAN1 SOL2 DC300 LK3-B430E Mark II...
  • Page 71 10. ELECTRIC MECHANISM Power supply circuit board DC300 POWER ACIN DC18 Panel PCB LK3-B430E Mark II...
  • Page 72 • The work clamp does not operate. Main circuit board • Thread trimming is not performed. • Error E-61 is displayed. Sewing Thread clamp trimming solenoid solenoid • Thread take-up lever does not operate. Main circuit board Thread take- up solenoid LK3-B430E Mark II...
  • Page 73 Synchro- nizer • The machine motor does not run. • Motor operation is unstable. Main circuit board • Needle up stop position is not correct. • Error E-20 is displayed. • Error E-50 is displayed. Machine motor LK3-B430E Mark II...
  • Page 74 • Error E-F1 is displayed. Power supply circuit board Main circuit board • Indication is strange. • Any switch does not have any effect. Main circuit board • The power lamp is not lit. Panel PCB LK3-B430E Mark II...

  • Page 75: Explanation Of The Dip Switches

    Single pedal Presser is raised by pressing the pedal. — Single pedal — Presser is raised auddtomatically, then it is lowered by Two pedals pressing the pedal. Two pedals Presser is kept lifted while the pedal is pressed. LK3-B430E Mark II...

  • Page 76: Dip Switches Inside The Control Box

    Low speed sewing is not performed at the start of sewing. The motor operates in reverse when the upper shaft stops, to return the needle bar to DIPB-7 close to its highest position. DIPB-8 Area checking of the sewing data is not carried out. LK3-B430E Mark II...

  • Page 77: Explanation Of The Memory Switches

    Test feeding will be performed at the same speed as that for actual sewing. memo-0E (This is used for checking feeding operation.) After sewing is finished, the work clamp automatically opens and closes once (practice memo-0F operation). LK3-B430E Mark II...
  • Page 78 Changes the feed timing for the first stitch at the sewing start. memo-3c — — — — memo-3d — — — — memo-3E — — — — memo-3F — — — — memo-40 – — — — — memo-4F LK3-B430E Mark II...

  • Page 79: Checking The Input Sensor And Dip Switch Input

    The DIP switch can be changed at this time without turning off the power so that you can check the DIP switch input. However, you should normally always turn off the power when changing DIP switch set- tings. 3. Press the TEST switch w again to return the display to the normal condition. LK3-B430E Mark II...

  • Page 80: Checking The Input Voltage

    • This operation causes all settings stored in memory such as memory switch and user program settings to be cleared. • If the optional emergency stop switch has been installed, you should reset memory switch No. 10 to ON. LK3-B430E Mark II...

  • Page 81: Confirming Software Version

    2. Every time the SELECT switch e on the panel is pressed until the TEST switch q is pressed again, the indication will change as follows: Indication LED of Menu switch PROM X-SCALE Main PROM MN Y-SCALE Motor PROM MT Version number indication (example) PROM label Indication[A300] Indication[b403] LK3-B430E Mark II...

  • Page 82: Table Of Error Codes

    (Refer to "10-8. Checking the input was turned off. voltage".) Turn off the power and check the input voltage. (Refer to E-91 Abnormal rise in power supply voltage. "10-12. Checking the input voltage".) LK3-B430E Mark II...
  • Page 83 Turn the EMERGENCY STOP switch clockwise to release the lock, and then press the RESET switch to reset the E-14 Thread breakage detected. error. You can then press the STEP BACK switch to repeat the sewing. REFERENCE segment LED alphabet Panel display Text dispalay LK3-B430E Mark II...

  • Page 84: Troubleshooting Flowchart

    (Special): For machines with two pedal foot switches, press the start Press the foot switch to the pedal. second position, Note: If error code [E-50] appears on the display window, turn the pulley and release it. to raise the needle to its highest position. LK3-B430E Mark II...
  • Page 85 Turn off the Is the test lamp lit? power. Press the foot switch to the second position, (Special): For machines with two pedal foot switches, press the presser foot and release it. lifting pedal first, then the start pedal. LK3-B430E Mark II...
  • Page 86 Does the Turn off the work clamp move so as power. to form stitches? Turn off the Is the thread power. trimmer activated? LK3-B430E Mark II...

  • Page 87: Problem Solution And Measures

    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 numbered details of the problem in the following table. LK3-B430E Mark II...
  • Page 88 230 V specifications of wall socket For 100 V, 110 V, 240 V, 380 V, 400 V, and About 220 V 415 V specifications After checking, turn off the power, and rejoin P4 connectors. LK3-B430E Mark II...
  • Page 89 After measurement, turn off the power. 7. Panel circuit board defective Panel circuit board Check that P8 (PANEL) connectors of the main panel cord circuit board and P1 (PANEL) connectors of the panel circuit board are plugged in. LK3-B430E Mark II...
  • Page 90 11. Abnormal electricity supply is Main circuit board Power supply circuit board defective if the detected when error code and power supply error still appears after replacement of the E-F2 appears on the display circuit board main circuit board. window. LK3-B430E Mark II...
  • Page 91 If there is no continuity, the fuse is defective. mechanism does not move Error Proceed to #6-2. and error code E-A0 appears code appears on the display window. on the display window when the foot switch is LK3-B430E Mark II...
  • Page 92 5 and 7, in the connector on the cable. If the resistance is 2 - 3 Ω, it is not defective. Main circuit board After measurement, rejoin P6 and P7 connectors. If item b causes no problem, the main circuit board is defective. LK3-B430E Mark II...
  • Page 93 1. Work clamp is not raised when Same as #7-2. error code E-62 appears on the Work display window. clamp does not lower. 2. Work clamp is not lowered Same as #7-1. although attempted when error code E-63 appears on the display window. LK3-B430E Mark II...
  • Page 94 See #6. The feed mechan- ism does not move during test. See #5. Quick feeding cannot be per- formed during test. See #5. See #6. machine does not operate correctly for the set program during test sew- ing. LK3-B430E Mark II...
  • Page 95 If 550VA /machine is not allocated at the code E-90 appears after the power source, the voltage will drop as soon machine is started. as the machine is started, resulting in this error. LK3-B430E Mark II...
  • Page 96 Separate P4 (SOL2) connectors on the main defective circuit board, then measure resistance between pins 1 and 2 in the connector on the cable. If the resistance is 12 - 14 Ω, the solenoid is not defective. LK3-B430E Mark II...
  • Page 97 If the voltage across the following pairs of pins, pins 1 and 2, pins 4 and 5, and pins 10and 11 is DC 15 - 18 V, it is OK. 5. Main circuit board defective Main circuit board 6. Motor defective Motor LK3-B430E Mark II...

  • Page 98: Control Circuit Block Diagram

    Black Start B3B-PH 5219-03A -K-S B11B-PH-K-S B11B-PH-K-S Foot switch CLAMP1 Control box Green/ CLAMP2 Yellow EARTH Green/Yellow Green/Yellow START Power switch White Black White White Green/Yellow Black DCfan Yellow/ Yellow/ Green Green Machine motor Power supply plug LK3-B430E Mark II...
  • Page 99 SERVICE MANUAL BROTHER INDUSTRIES,LTD. NAGOYA,JAPAN Printed in Japan 118-V30 I9100769B 1999.11. (1)

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