Brother PC6000 Service Manual
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Brother PC6000 Service Manual

Brother PC6000 Service Manual

Computerized sewing machine
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SERVICE MANUAL FOR
COMPUTERIZED SEWING MACHINE
PC6000
SUPER ACE I
9. 1997.

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  • Page 1 SERVICE MANUAL FOR COMPUTERIZED SEWING MACHINE PC6000 SUPER ACE I 9. 1997.

  • Page 2: Principal Mechanisms

    GENERAL INFORMATION This service manual has been compiled for explaining repair procedures of the model PC6000 and SUPER ACE I. This was produced based on up-to-date product specifications at the time of issue, but there may have been changes of specifications for the purpose of improvements.

  • Page 3: Table Of Contents

    PRINCIPAL MECHANISMS 1. MECHANICAL CHART....................2 2. POWER TRANSMISSION CHART................3 3. ELECTRONIC PARTS ARRANGEMENT CHART..........4 4. CONTROL SYSTEM BLOCK DIAGRAM..............4 5. MAIN MOTOR CONTROL ..................5 6. PATTERN GENERATOR..................5 7. AUTOMATIC THREAD TENSION................5 8. OTHER ELECTRONIC COMPONENT FUNCTIONS..........6...

  • Page 4: Mechanical Chart

    MECHANICAL CHART...

  • Page 5: Power Transmission Chart

    POWER TRANSMISSION CHART Generating mechanism of needle bar, thread take-up lever and zigzag movements Mechanism of feed dog and rotary hook movement...

  • Page 6: Electronic Parts Arrangement Chart

    ELECTRONIC PARTS ARRANGEMENT CHART CONTROL SYSTEM BLOCK DIAGRAM Control system block diagram...

  • Page 7: Main Motor Control

    MAIN MOTOR CONTROL The main motor for the sewing machine is required to smoothly change from low speed to high speed without any fluctuations due to load or temperature changes. To fully comply with this requirement, this model adopts PWM control using FET.

  • Page 8: Other Electronic Component Functions

    OTHER ELECTRONIC COMPONENT FUNCTIONS Start/stop switch used to start and stop (SS) the machine. If you want to start sewing at low speed, keep this switch depressed and start sewing. Backstitch switch used for backstitching and lockstitching. Backstitching is performed at low speed in the reverse direction while the switch is pressed.
  • Page 9 II. DISASSEMBLING AND REASSEMBLING THE SEWING MACHINE 1. DISASSEMBLING AND REASSEMBLING THE OUTER PARTS AND MAIN PARTS ...............8 2. LEAD WIRE ARRANGEMENT ................16...
  • Page 10 DISASSEMBLING AND REASSEMBLING THE OUTER PARTS AND MAIN PARTS Remove the screw securing the face plate, and the face plate by sliding it to the left. Remove the screw securing the free arm cover, and the free arm cover by sliding it to the left. Remove the blind cap on the belt cover, the screw securing the belt cover, and the belt cover from below by sliding it to the right.
  • Page 11 8. Remove the presser holder and needle. 9. Remove the 11 connectors, the two screws, and the main PC board. 10. Remove the two screws and handle holder assembly. 11. Remove the screw and thread winding assembly. 12. Remove the motor belt and pull out the motor connector. Remove the two screws and the main motor. 13.
  • Page 12 19. Remove the two screws and the thread cutter unit. 20. Remove the screw and the inner rotary hook bracket. 21. Remove the presser bar clamp screw. 22. Remove the presser bar by lifting it from above, and the presser bar clamp. 23.
  • Page 13 27. Remove the two screws securing the upper shaft metal, and the upper shaft assembly. 28. Remove the screw and the N.P. board assembly. 29. Remove the screw and the tension pulley holder. 30. Remove the two feed rod tension springs. 31.
  • Page 14 37. Attach the base plate using the three screws. 38. Attach the power supply unit assembly using the two screws, and insert the inlet connector. 39. While attaching the timing belt, assembly the lower shaft assembly using the metal presser and screw. 40.
  • Page 15 47. Attach the thread take-up shaft using the screw. 48. Insert the tension releaser plate. 49. Attach the presser spring using the collar and screw. 50. Insert and attach the presser foot lifter using the presser lifter shaft. 51. Insert and attach the presser bar into the presser bar clamp. 52.
  • Page 16 55. Attach the ZPM holder assembly using the two screws. 56. Attach the needle bar block assembly using the three springs. (Insert the needle bar clamp into needle bar crank rod) 57. Attach the H block shaft holder using the screw. (Insert the needle bar block arm into the pin on the needle bar block.) 58.
  • Page 17 66. Attach the rear cover using the three screws. 67. Attach the needle plate assembly using the two screws. 68. Connect the four connectors, and attach the front cover using the three screws. 69. Insert the base cover into the base plate and attach using the two screws. 70.
  • Page 18 LEAD WIRE ARRANGEMENT -16-...
  • Page 19 III. HOW TO ADJUST MECHANICAL ELEMENTS 1. SETTING THE TEST MODE..................18 2. TENSION OF MOTOR BELT AND TIMING BELT..........18 3. NEEDLE DOWN POSITION ADJUSTMENT............19 4. TIMING OF NEEDLE AND ROTARY HOOK (CLEARANCE BETWEEN THE NEEDLE AND THE ROTARY HOOK POINT) ..19 5.

  • Page 20: Setting The Test Mode

    SEETING THE TEST MODE BASIC TEST MODES To set the test mode, turn on the power switch while holding down the start/stop button and backtack button simultaneously. Numerals will appear on the touch panel. The respective test mode will be entered when the numeral is pressed.

  • Page 21: Needle Down Position Adjustment

    NEEDLE DOWN POSITION ADJUSTMENT STANDARD When test mode "4" is selected, the needle should be exactly at the middle of the needle plate hole in the needle down position. ADJUSTMENT Select test mode "4". Turn the balance wheel to move the needle to the needle down position. Loosen the screw securing the zigzag adjusting nut.

  • Page 22: Needle Bar Height

    NEEDLE BAR HEIGHT STANDARD When test mode "5" is selected, turn the balance wheel so that the needle meets the rotary hook point. At this time, the clearance between the upper end of the needle eye and the bottom of the rotary hook point should be 1.0-1.4 ADJUSTMENT Select test mode "5".

  • Page 23: Front/Back, Left/Right Position Of Feed Dog

    FRONT/BACK, LEFT/RIGHT POSITION OF FEED DOG STANDARD When test mode "6" is selected, move the feed dog front/back and left/right. At this time, the feed dog should not contact the needle plate. When the front/back position is the maximum feed amount, the clearance between the feed dog and needle plate at the feed start position (when feed dog is at very front) should be 0.5 to 1.0.

  • Page 24: Presser Bar Height

    PRESSER BAR HEIGHT STANDARD The clearance from the needle plate top to the bottom of the presser bar should be 7.0-7.5 mm. ADJUSTMENT Raise the presser foot lifter. Loosen the screw of the presser bar guide bracket. Adjust the height of the presser bar by moving it vertically. Tighten the screw of the presser bar guide bracket.

  • Page 25: Position Of Buttonhole Switch Lever

    POSITION OF BUTTONHOLE SWITCH LEVER STANDARD When the buttonhole lever is lowered, the clearance of front part of buttonhole foot is 1.5 mm and the presser foot lever is lowered BH 0 should touch BH 1. ADJUSTMENT Turn on power switch and select pattern Fit the buttonhole foot (A).

  • Page 26: Inner Rotary Hook Bracket Position

    INNER ROTARY HOOK BRACKET POSITION STANDARD When the inner rotary hook bracket and the rotary hook meet, the spring of the inner rotary hook bracket and the inner rotary hook should overlap each other by 1.9-2.1 mm. ADJUSTMENT Loosen the screw securing the inner rotary hook bracket. Adjust the position of the inner rotary hook bracket by moving it vertically and/or horizontally.

  • Page 27: Feed Adjustment (Vertical Feed)

    FEED ADJUSTMENT (VERTICAL FEED) STANDARD Adjustment of the pattern should be possible in test mode "3". ADJUSTMENT Loosen the screw securing the pulse motor. Rotate the pulse motor and adjust the pattern. * Make sure not to contact the main PC board during the adjustment.

  • Page 28: Needle Threader

    NEEDLE THREADER #14-16. USING THE NEEDLE THREADER 5. Do not turn the balance wheel when using needle There are a wide variety of different needles and threader. sewing machine threads available. The right ones 6. Do not lower the needle threader lever while the should be selected in accordance with the sewing machine is running.

  • Page 29: Needle Threader (Exchange)

    NEEDLE THREADER (EXCHANGE) HOW TO EXCHANGE NEEDLE THREADER Remove the needle and lower the presser foot. Push down the needle threader and take it out. Place a new one so that the guide is immediately under the groove as shown in figure A . Push the needle threader all the way up so that the guide is fits into the groove.

  • Page 30: Needle Threader

    NEEDLE THREADER (CHECKING THE HOOK POSITION IN VERTICAL DIRECTION) Case A Adjust needle threader position setter slightly down and check that the clearance between the top of hook and top of needle eye is 0 mm. Case B (Hook point is too low) Adjust needle threader position setter slightly up and check the clearance between the top of hook and top of needle eye is 0 mm.
  • Page 31 IV. HOW TO ADJUST ELECTRONIC ELEMENTS 1. When power is turned on, buzzer does not sound and nothing appears on display ....................30 2. After the power is turned on, pulse motors do not return to their home positions with respect to the needle position........30 3.
  • Page 32 HOW TO ADJUST ELECTRONIC ELEMENT * You must turn off the power and remove connectors from printed circuit boards before measuring resistance. PROBLEM CHECK REMEDY 1. When power is turned 1) Has the display contrast been adjusted? 1) Adjust the contrast. on, buzzer does not 2) If the voltage between both inlet terminals is 2) Replace the power cord.
  • Page 33 5. Operation of main 1) When turning on power and moving speed slide, does 1) Replace VR board assembly. motor is not stable, voltage between pins 3 and 2 of connector CN10 (for maximum speed speed slide) change from 0 to 5 VDC? operation is not 2) When turning balance wheel, do voltages between 2) Replace NP board assembly.
  • Page 34 11. Thread tension is not 1) Is thread route correct? 1) Check thread route. correct. 2) Are the 0 mm and 3 mm fabric thickness adjustments 2) Check. correct? 3) Adjust or replace ATPM holder 3) Turn off power and lower presser foot. When turning complete.
  • Page 35 Main PC board Power supply unit -33-...
  • Page 36 LCD unit Other PC boards (985) -34-...
  • Page 37 PC6000 SUPER ACE I H7060087 -35-...

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Super ace i

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