Brother COMPAL GALAXIE Service Manual
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Brother COMPAL GALAXIE Service Manual

Brother COMPAL GALAXIE Service Manual

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SERVICE MANUAL FOR COMPUTERIZED SEWING MACHINE
"COMPAL GALAXIE"

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Summary of Contents for Brother COMPAL GALAXIE

  • Page 1 SERVICE MANUAL FOR COMPUTERIZED SEWING MACHINE "COMPAL GALAXIE"...
  • Page 2 GENERAL INFORM ATION SYMBOLS USED ARE: Th1s service manual is compiled for repa1ring service of COMPUTERIZED SEWING MACHINE "COMPAL GALAXIE" Move the part as this way (one way) (Factory code #114-870). Use this manual with Parts Catalogue (H3030294) for fault f1ndmgs when you make a repair.
  • Page 3 I. PRINCIPAL MECHANISMS 1. MECHANICAL CHART Balance wheel Eccentuc counter weoght Thread take-up lever assembly Needle bar supporter Needle bar crank Needle crank Needle bar clamp --� Clutch mechanosm Needle Linear actuator feed feed feed Lower Verucal Lower shah Horozontal Horozontal timong mechanism...
  • Page 4 2 . POWER TRANSMISSION CHART (A) G ene r a t ing mechan ism o f needle bar, t hread (B) Movemen t s o f feed dog and shutt le hook tak e-up lever and z igzag movemen t s ®...
  • Page 5 3. ELECTRONIC PARTS ARRANGEMENT CHART Sub-pronted corcuot Bobbin wonder swotch Ne.ctle (0ownt IAChCit+ng POI+Iton Buttonhole (BHI SWitCh Transformer Junction for foot controller Feed dog swotch Cord reel unot Speaker Common pronted circuot board Sode cutter swotch...
  • Page 6 4. CONTROL SYSTEM BY MICRO-COMPUTER The micro-computer being used in Compal Galaxie is 8-bit computer fabricated on a single chip using N-MOS (N­ channel silicon gate MOS process) in 40 pins dual-in-line package with built in 4 K byte mask ROM. 96 byte RAM.
  • Page 7 6. THE FUNCTION OF MICRO-COMPUTER (MAL-WARNING VOICE) CPU be1ng used in this machine i s supervising the k1nd of selected pattern. position of presser foot. feed dog and buttonhole lever. state of bobbin-winding. Start/stop switch. reverse switch. etc. If the customer operates the machine erroneously.
  • Page 8 A mam motor for sewing machine requ1red to have stable revolution from low speed to h1gh speed against load fluctuatiOn and temperature change. To fully comply with th1s requ1rement. th1s Compal Galaxie adopt1ng low­ motor and PWM ( P ulse W1dth Modulation) by transistors.

  • Page 9: Table Of Contents

    11. DISASSEMBLING REASSEMBLING Outer parts ............................2 . Cord reel unit .............................. 24 Printed circuit boards ........................ Lead wires ........

  • Page 10: Outer Parts

    OUTER PARTS 1 . Raise pressure regulating lever and remove face plate by loosening a screw. 2. Remove bobbm wmder cover by loosening a screw. 3 . Remove cover by front loosening three screws. 4. Remove bed cover by loosening two screws. 5 .
  • Page 11 base plate...
  • Page 12 8. Remove stop nng then remove zigzag connecting link. 9 . Loosen a screw on eccentric counter we1ght. 10. Lower pressure regulating lever. & 1 2 Remove pressure regulating mechanism by loosening two screws. - 1 0 -...
  • Page 13 Remove power supply base plate cover. Dtsconnect power supply swttch connector A and transformer connector B.
  • Page 14 1 5 . Remove plug case by loosenmg screw. Remove cord reel unet by looseneng three screws. - 1 2 -...
  • Page 15 Loosen a screw. Loosen a screw. Remove a eccentric shaft from lower shaft holder (Right Remove feed mechantsm untt by loosening five screws. --• �I Stud plate ® � � ® - 13 -...
  • Page 16 2 1. Remove ztgzag connecting lever by loosentng a stud screw. 22 .-a Remove stop nng then remove ztgzag connecting ltnk. as done at step 8. Remove transformer by loosentng two screws. Remove ftxtng plate by loosentng a screw. Remove supporttng plate by loosentng a screw Remove ltnear actuator by loosentng two screws.
  • Page 17 Reassembling 6 mm. 24. Determine the pos1tion to f1t feed mechan1sm unit by a pm, of which diameter Fit feed mechanism unit by using five screws. Change the pos1tion of red knob to left to lower feed dog and make sure the clearance between stud plate and vertical arm more than 0.
  • Page 18 3 0. Meet the convex portions of linear actuator gear and feed regulator gear to face each other then trghten i n two screws making sure the clearance between both gears is 0.0 3 "' 0.0 4 mm. 31.-a Fit the zigzag connecting l i n k to vertical arm by a stud screw. Attach supporting plate to the linear actuator.
  • Page 19 32. Fit the pressure mechanism unit to vertical arm incerting eccentric counter weight into upper shaft. Tighten pressure mechanism unit in two screws. At that time tighten upper screw slightly and after adjusting the top of needle drop to the center of needle hole. tighten two screws securely. 34.
  • Page 20 3 6. Lower the needle until 1ts lowest pos1t1on by turmng balance wheel. Turn the balance wheel so that the base line of lower t1mmg pulley IS nght under then make sure the clearance between eccentric counter we1ght and upper shaft bushmg IS 0 - 0.02 mm. T1ghten the screw of eccentriC counter we1ght securel Eccenuoc coun1er weoghl -18-...
  • Page 22 Needle On the way lowenng h 1gh needle bar Brake gum Screw the needle bar h1ghest po1 Measurement on • c =a+ 15.2...
  • Page 23 4 5. PositiOn rotation shutter so that it can cross rotat1on sensor when needle IS pos1t1oned at 22.9 mm lower than its h1ghest position. Then pos1t1on shutter so that can cross sensor when the clearance between thread take-up lever and the nb of thread guard IS about 0 mm. (Th1s 1s temporary adJUStment and make f1nal adJUStment later.
  • Page 24 Connect mam power sw1tch connector A and transformer connector B 4 7. Fit the power supply c1rcu1t board Fit cord reel unit by t1ghtemng three screws. 49. Fit plug case by t1ghten1ng a screw.
  • Page 25 50. Fit plug case by tightening a screw. Fit extension plate with two screws. 5 1 . Fit bed cover with two screws. Fit front cover with two screws. Fit bobbin winder then tighten a screw. Fit a face plate with a screw. Fit a manual stitch control switch cover.

  • Page 26: Cord Reel Unit

    2. CORD REEL UNIT (How remove) 1. Loosen 3 screws and remove those screws holdmg cord reel base so that it does not turn. Turn cord reel base counterclockwise about 4 - 5 times until it is free from the tension of spiral spring.

  • Page 27: Printed Circuit Boards

    3. REMOVING PRINTED CIRCUIT BOARDS...

  • Page 28: Lead Wires

    4. LEAD WIRES ARRANGEMENT •a...

  • Page 29: Transparency Display Plate

    5. REMOVING TRANSPARENCY DISPlAY PlATE (The order of di .. uembling) spring. Loosen a screw then remove a stop rsng and a Remove pattern change lever. screws. Loosen 2 Remove transparency display plate. (The order of reaaaembling) Proceed sn reverse order of disassembling. Make sure to f1t sprsng as Illustrated.
  • Page 30 Fitt ing position of micro-switch Make sure the micro-switch actuator i s in l1ne with micro­ switch body. Make sure LED is lighted when mi cro-switch connected t o printed circuit board and pattern lead wire Pattern dtsplay change lev change lever is moved to right.
  • Page 31 Ill. HOW TO ADJUST THE MECHANICAL ELEMENTS 1 . Position of shuttle hook ·········· · · · · · · · · · · · · · · · · · · ··········································· ··················································· Height of needle bar ..........................31 3 .

  • Page 32: Position Of Shuttle Hook

    1. POSITION OF SHUTTLE HOOK STANDARD When z1gzag stitch is selected and the width set at its maximum position. When needle raises from its lowest pos1tion by 4.0-4.3 mm. the hook point should meet with the side of the needle at left needle movement.

  • Page 33: Height Of Needle Bar

    2 . HEIGHT OF NEEDLE BAR STANDARD When the zigzag st1tch IS selected and the w1dth 1s set at 1ts max1mum position. The clearance between the upper top of needle eye and bottom top of hook IS 0.4- 1.0 mm when needle and hook meet at left needle POSitiOn.

  • Page 34: Height Of Presser Bar

    3. BOBBIN CASE HOLDER BRACKET 4. HEIGHT OF PRESSER BAR STANDARD STANDARD The clearance between presser foot and needle plate 1s 6 .0 The clearance between the bracket and hook 1s 0.5- 0 7 -6 .5 mm. ADJUSTMENT ADJUSTMENT Select zigzag pattern and set Z1gzag width at ··o··. Ra1se presser foot lever.
  • Page 35 5. HEIGHT OF FEED DOG STANDARD The feed dog is higher than needle plate by 0.9 - 1 . 1 when drop feed IS set at up posit1on and 1t reaches its h1ghest position. The clearance between the feed dog and needle plate 1s more than 0.
  • Page 36 POSITION OF ROTATION SHUTTER & N.P. (NEEDLE POSITION) SHUTTER STANDARD D1sappear the LED md1cat1ng ··w (horizontal) when needle 1 s reached at the position of mm lower than 1ts 22.9 h1ghest pos111on by turnmg balance wheel at test mode. In case that needle is set at 1ts up position. the top of needle IS stopped at the pos1t1on of 8 mm upper than needle plate also thread take-up lever is stopped at the position of 1 4 ±...
  • Page 37 22.9 Rotatoon shutter Needle lowest poont Upper face of needle plate...

  • Page 38: Brake Timing For Feed Regulator

    7. BRAKE TIMING FOR FEED REGULATOR STANDARD When balance wheel i s turned forward. feed regulator is released from the brake at the position that needle i s lowered mm from its highest pos1tion and brake operates again from the position that the need l e 1s raised at 15.2 m m 21.4 until its h1ghest posit1on through its lowest position.

  • Page 39: Tension Of Motor Belt

    8. TENSION OF MOTOR BELT STANDARD 6 mm) when the motor belt is JUSt pushed (about 200 g pressure.) There should be some slacks (4 ADJUSTMENT 1. Loosen two screws. Adjust belt tension by moving motor holder to meet with above standard.
  • Page 40 9. TENSION OF TIMING BELT STANDARD There should be some slacks 5 mm) when the timing belt is just pushed (abotu 200 g pressure.) ADJUSTMENT Loosen a screw. 2. Adjust the posit1on o f idle pulley to meet with above standard.
  • Page 42 VR9 VR10 <D D 00�, VR6 VR7 31\eil &� VR5 e VR4 D �VRB � (t}vRt NOTE Each speed s never exceed to the standard. The sewi ng speed is indicated by 2 digits in digita l display window. Ex. "1 2" means "1 20R .P.M:·.

  • Page 43: Needle Stopping Speed

    NEEDLE STOPPING SPEED STANDARD When needle stops at 1ts up pOSitiOn. needle threader can be usable and pass the thread to thread take-up lever �aslly. ADJUSTMENT 1 . Set the machine at test mode. Set the sew1ng speed at 1 40R.P.

  • Page 44: Centering Of The Needle

    12. CENTERING OF THE NEEDLE STANDARD 1. Needle should drop at the canter of needle hole when z1gzag pattern is selected w1th its mmimum stitch width ADJUSTMENT Set a machine at test mode. Select the zigzag st1tch. 3 . Turn the volume VR1 0 clockwise or counterclockw1se so that needle should drop at the center of needle hole. &...
  • Page 45 13. SETTING OF THE MAXIMUM NEEDLE SWING STANDARD Needle enters the needle hole balanced when zigzag stitch IS selected w1th ItS max1mum st1tch w 1dth ADJUSTMENT 1. Set a machme at test mode. Select z1gzag stitch Set the z1gzag w1dth at 1ts max1mum pos1110n 4.

  • Page 46: 4 . Forward Feeding At Straight Stitches

    FORWARD FEEDING AT STRAIGHT STITCHES STANDARD There should be no feeding when stitch length is set at its minimum position. stitches are sewn 1n 24 When setting at stra1ght st1tch. ADJUSTMENT 1. Set a machine at test mode. Set the speed control lever at 1ts maximum position.
  • Page 47 15. LENGTH OF FORWARD AND REVERSE STITCHES FOR SUPER AUTOMATIC PATTERNS STANDARD Make sure to obtain proper length of both forward and reverse stitches to make fine pattern. ADJUSTMENT Change to memory mode by moving pattern change lever to right. 2.

  • Page 48: 6 . Position Of Buttonh O L E Sw 1 Tch Lever

    POSITION OF BUTTONHOLE SWITCH LEVER STANDARD 1 . When buttonhole lever {Blue lever) and presser foot lever are lowered. BHO touches with BH 1. The legs of buttonhole should be d1ameter of button plus Bunonhole sw•tch body 2. 5 ADJUSTMENT 1.

  • Page 49: 7. Upper Tension Dial

    17. UPPER TENSION DIAL STANDARD The clearance between two discs should be 0 - 0.3 when presser foot i s lowered and tension dial is set at Spnng i s touched with spring holder and the top of thread release plate begins to depress on the tension disc when presser foot is lowered and tension dial rs set at ADJUSTMENT...

  • Page 50: Thread Tension Release

    THREAD TENSION RELEASE STANDARD The clearance between two discs should be more than 0.5 mm when presser foot IS ra1sed and tens1on d1al IS set at ADJUSTMENT Set upper tens1on d1al at and raise the presser foot lever. AdJuSt the position of thread tens1on release B to meet w1th above standard.

  • Page 51: Side-Cu Tter Adjustm Ent (Lock Lever Posi T I O

    19. SIDE-CUTTER ADJUSTMENT (LOCK LEVER POSITION) STANDARD When the lock lever IS fully pushed down (2.5- 3.0 kgs). the lower part of lock lever should be pos1t10ned w1thm the red mark. ADJUSTMENT Loosen two screws and take out the upper plate. Take out bracket case and attach the s1de-cutter on the tubular arm.
  • Page 52 20. SIDE-CUTTER ADJSUTMENT (LOWER UPPER KNIVES) STANDARD When Side-cutter IS out of machine and upper kn1fe holder Move the holder downward and loosen a set screw. Adjust IS at h1ghest pos1t1on. both knives meet each other by 0. 7- the clearance between guide axis and holder be 0 mm and then tighten the set screw.

  • Page 53: Side-Cutter Adjustment (Upper Knife Does Not Work)

    21. SIDE-CUTTER ADJUSTMENT (UPPER KNIFE DOES NOT WORK) STANDARD Upper kn1fe should work when 1t set to machane. ADJUSTMENT 1. Attach the s1de-cutter to tubular arm and set the needle bar at 1ts h1ghest pos1t1on. 2 Loosen a screw. By mov1ng the holder up and down. seek the pos1tion that the pan 1s fitted 1nto gu1de plate. T1ghten the screw.
  • Page 54 22. SIDE-CUTTER AD JUSTMETN (ATTACHING GUIDE PLATE A & STANDARD The clearance between gUide plate A and upper knife should be 0 mm. ADJUSTMENT S e t the holder at 1ts h1ghest pos111on. 2. Loosen the screws on gu1de plate A & B and adJUSt the clearance between the gu1de plate A and upper kn1fe to beO.

  • Page 55: Needle Threader

    23. NEEDLE THREADER Needle threader accept o nly circle marked needle and thread combmations. marked combination is not recommended since it might lead to the breakage of needle threader imperfect • performance. Lower the presser foot when you use needle threader. Do not use needle threader when you use twin needle.

  • Page 56: Needle Threader (Exchange)

    24. NEEDLE THREADER (EXCHANGE) How to exchange needle threader Remove needle and lower the presser foot. Push down needle threader to take out 3 Place new one so that gu1de IS 1mmed1ately under the gu1de p1n. Push needle threader all the way up so that gUide 1s placed 10 the pm.

  • Page 57: Needle Threader (Checking The Hook Position)

    26. NEEDLE THREADER (CHECKING THE HOOK POSITION) STANDARD The clearance between the top of hook and the top of needle eye 1s 0. located h1gher than 8 Threadmg is capable when needle mm from the needle plate. CHECK Case A Hook pos1t10n 1s too Case B Hook pos1t1on...

  • Page 58: Needle Threader (Adjustment Of Hook Position)

    NEEDLE THREADER (ADJUSTMENT OF HOOK POSITION) ADJUSTMENT Case A (Hook pomt 1S too h1gh) Remove face plate and loosen the screw. Adjust needle threader slightly down and check the clearance between the top of hook and top of needle eye 1 s zero. ®...
  • Page 59 IV. HOW TO ADJUST ELECTRONIC ELEMENTS Power supp l y ······················· ··············· · · · · ················ · · · · ··············· ··············· ························ ······················· ··· 2. When po wer supply is on . z1gzag st1tch is not indicated by LED ············································...
  • Page 60 CONNECTORS TABLE Length lonear actuator connector Sode-cuner swotch connector Feed dog switch connector ache-generator connector Maon motor connector Speaker connector Sub-pr.nted corcuot board Speaker connector...

  • Page 61: Power Suppl

    adjust -trHow to electric elements 1. POWER SUPPL Secondary voltage of transformer (P13) AC Voltage Terminals Notes about 1 5 1 - 7 for circu1t & 4 - 7 main motor Power 9- 1 1 about 1 3 .0V for lamp source Transfurmer Cord reel unit...
  • Page 62 Transformer (Secondary Voltage) • 1 . Connect transformer connector Band take out circuit board cover. Fit cord reel unit to the machine. 2. Take out face plate and front cover. D1sconnect transformer connector P1 3 from common c�rcu1t board. 4. Insert power supply plug to outlet and turn the power supply switch 5.

  • Page 65: When Po Wer Supply Is On . Z1Gzag St1Tch Is Not Indicated By Led

    2. WHEN POWER SUPPLY IS ON, ZIGZAG STITCH IS NOT INDICATED BY LED Check 1f the power supply normal. Refer to on page item 1 "POWER SUPPLY" ClfCUit board un1ts. Exchange mam 3. PATTERN SELECTION (Movement of machme when pattern selecting sw1tch is depressed) Flow chart Pattern selectong os depressed?
  • Page 66 3-1. Pattern display ia not moved when pattern selection switch ia depressed Turn the power supply switch off. D1sconnect connector from c1rcu1t board. Measure between terminal between termmal Exchange start/stop switch unit Disconnect connector P 1 4 Measure between terminal P 1 4 Exchange foot controller jack Exchange main c1rcuit board umts...

  • Page 67: Memory Mode Is Not Selected When Pattern Display Change Lever Is Moved To Right

    3-2. Memory mode is not selected when pattern display change lever is moved to right Check the f1tt1ng position of 1 . D1sconnect connector P1 0 for s1de-cuner m1cro-sw1tch. (Refer to page SWitCh. Turn power supply sw1tch on and shift pattern display change lever to nght.

  • Page 68: Other Patterns Than The Ones For Side-Cutter Are Selected When Side-Cutter Is Attached

    3-3. Other patterns than the ones for side-cutter are selected when side-cutter is attached Attach side-cutter to the tubular arm. Remove connector P 1 0. Measure R between terminal & 2 P 1 0 Exchange Side-cutter sw1tch R :ii lfl Exchange main circuit board units.

  • Page 70: Main Motor

    4-1. Main motor does not rotate when stop switch is depressed start/ Disconnect connector and measure the Warnong made by buzzer? resistance between terminal 4 & 7 on P 1 while start/stop button is depressed. Turn the balance wheel both clockwise and counterclockwise.

  • Page 71: Machine Stops With Warning Buzzer In A Second After It Runs

    4-2. Machine stops with warning buzzer in a second after it runs Make the check as same as on page ® & N.P. Rotation shutter Adjust the rotation/N.P. shutter. are properly pos111oned' (Refer to page Exchange N.P. circuit board. 4-3. Out of speed control Re-connect connected?

  • Page 72: Main Motor Stop

    MAIN MOTOR STOP (movement when stopping machine) 0 Flow chart Set the machine at its lowest speed. The relat1on of posit1on between N.P. sensor N.P. shutter. (Refer to page & When N.P. sensor 1s blocked by N.P. shutter Needle-up position ·...

  • Page 73: Main Motor Does Not Stop

    6-1. Main motor does not stop Adjust R.P.M. at the lowest speed by turmng VR1 (Refer to page 39) Adjust needle stop speed. (Refter to page 41) Finish Exchange main circuit board unets 6-2. Needle stop position (UP/DOWN) is incorrect Turn balance wheel by hand.

  • Page 74: Pattern Generation

    PATTERN GENERATION Flow chart Honzontal feed link moved. Needle bar is moved. Timing chart (Needle highest position 0°) shutte r (for detec ung needl e SlOP POS1t1 on) 160° 40" Needle-up pos1t1on pulse Needle-up pos1110n pulse W1dth dr�ve Non -bloc k Rota110n shutter (for detect1ng pattern pulse oulput pos1t1o Lock�ng Non-locking...

  • Page 75: Zigzag Width Is Not Correct

    Zigzag width is not correct Turn the power supply swttch off and move needle bar right and left by hand. AdJUSt rotauon shutter. (Refer to page 34 & 35) and measure the restst· isconnect connector ance between termmal 1 & 2. Exchange linear actuator unit.

  • Page 76: Stitch Length Is Not Correct

    6-2. Stitch length is not correct Check following points: 33 ) . height of feed dog (refer to page pressure lever. brake 36). timing for feed regulator (refer to page forward stitch (VR6 & VRB . refer to page 44). forward &...
  • Page 77 Flow chart (Buttonhole) Movement Movement Movement Movement Movement ® ® © -� -� -�...

  • Page 78: Buttonhole Is Not Obtained

    6-3. Butt o nhole is not obtained (Different length of nght and left leg) BHSW lever work by hand to make buttonhole. AdJUSt the posit1on of lever. (Refer to page D1sconnect connector Measure the resistance between termmal & 2 2 & 3 while lever is pushed back.

  • Page 79: Mal-Warning Voice Is Not Made

    7. MAL-WARNING VOICE IS NOT MADE Exchange sw1tches or sensors. 01sconnect connector Measure the res1stance between termmal 1 & 2 P 1 6. Exchange speaker Exchange ma.n circu1t board um - 77 -...
  • Page 80 Common Pnnted Circuit Board <Printed Circuit Board> 'tfCAUTION Take care following points when handling printed circu1t board: Do not touch the connecting portion of the connector. especially the pin for the plug with bare hands. for example. could be generated. causing bad connection. If the surface of the connecting portion is dirty.

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