Brother International DB2-B773 Service Manual

Brother International DB2-B773 Manual

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  • Brother International DB2-B773 | Service Manual - Page 1
    SERVICE MANUAL FOR DB2-B773 DB2-B774 DB2-B7740 SINGLE NEEDLE ADJUSTABLE TOP AND BOTTOM FEED LOCK STITCH MACHINE
  • Brother International DB2-B773 | Service Manual - Page 2
  • Brother International DB2-B773 | Service Manual - Page 3
    CONTENTS NAMES OF MAIN PARTS 1 SPECIFICATIONS 3 MECHANICAL DESCRIPTIONS 5 O Upper shaft and needle bar mechanism 5 O Lower shaft and rotary hook mechanism 5 M Upper feed mechanism 6 0 Feed mechanism 7 E Feed adjusting mechanism and quick
  • Brother International DB2-B773 | Service Manual - Page 4
    trimmer 38 0 Adjusting tension release 39 111Adjusting thread tension 40 D Adjusting synchronizer (DB2-B774) 41 III Adjusting thread wiper 42 M Adjusting potentio-meter (B7740) 43 EQUIPMENT 54 M Thread wiper 54 M Presser foot lifting solenoid set 55 TROUBLESHOOTING GUIDE 59
  • Brother International DB2-B773 | Service Manual - Page 5
    retainer @ Presser regulating screw O Tension nut [DB2-B7741 @ Machine pulley @ Reverse lever [DB2-B7740] a a !zi 6 O Needle bar @ Presser regulating screw @ Pre-tension O Tension nut © Machine pulley @ Reverse lever Control panel (B7740) C3 EXEDRA• brother srO i O ._J 2 O6 'M WI Vf s'In
  • Brother International DB2-B773 | Service Manual - Page 6
    Base [DB2-B774] I [DB2-677401 is n WA Li , tl bother ass Motor . • 0 NI . €. CZ:li • Thread wiper MI _(:), Power switch , • t ti - 4Z2) OD Quick reverse Compensation sewing -2- -------- 14/6 • • a a/ %iI - \ --
  • Brother International DB2-B773 | Service Manual - Page 7
    SPECIFICATIONS INDUSTRIES, DB2-B773-00q MADE IN JAPAN [ BROTHER LTD. When the upper feed amount is 6 Assembly B Shirring device Included The specifications of DB2-B774 with automatic thread trimmer are shown below. BROTHER INDUSTRIES, LTD. DB2-B774-III•• MADE IN JAPAN '-'------s til -
  • Brother International DB2-B773 | Service Manual - Page 8
    panel E -20 CIin avai4r -7, g ig E - 40 ° 270 OD DO NMR,,C1t/ a4Pgig E - 500 UZLUIUzJUI U ,CL.F MM OM Dug aLam r =-• Ply sensor brother LLPT >c illeig1O51214 141 Piece counter F PUSH P.COUNTER SENBOR11 The control panels are optional. Use one that suits your operation. Perspective IMI Ir
  • Brother International DB2-B773 | Service Manual - Page 9
    attached to the thread take-up crank 0. 3) The needle bar 0, attached to the needle bar clamp O, moves up and down. 4) The needle bar is guided by the needle bar bushings (upper) Co and (lower) O. El Lower shaft and rotary hook mechanism 0 O O 1) Rotation of the machine pulley 0 is transferred from
  • Brother International DB2-B773 | Service Manual - Page 10
    El Upper feed mechanism 0 ae O • C;) 1) When the machine pulley 0 rotates in the direction of the arrow, the eccentric wheel attached to the upper shaft @ moves the upper feed rock arm 0 up and down. 2) The feed regulator shaft assembly ® moves the horizontal feed connector attached to the upper
  • Brother International DB2-B773 | Service Manual - Page 11
    DI Feed mechanism tat O O 0 131 1) When the machine pulley 0 rotates in the direction of the arrow, the level feed eccentric wheel @ attached to the upper shaft @ moves the level feed connecting dog 0 up and down. 2) The level feed connecting dog 0 moves the level feed arm link assembly @,
  • Brother International DB2-B773 | Service Manual - Page 12
    Feed adjusting mechanism and quick reverse mechanism The upper feed regulating plate assembly 1) When the upper feed regulating plate assembly 0 rotates, the upper feed regulator cam rotates, moving the upper feed regulator assembly 0. 2) The angle of the feed regulator shaft assembly 0 attached to
  • Brother International DB2-B773 | Service Manual - Page 13
    El Upper feed mechanism and shirring mechanism (subclass -006) 0 0 0 0 O 0 Upper feed amount 1) When the upper feed regulating plate assembly (left) 0 rotates, the upper feed regulator cam @ rotates, moving the shirring lever 0 linked with the upper feed regulator shaft ©. 2) The shirring lever
  • Brother International DB2-B773 | Service Manual - Page 14
    Thread trimmer 1. Thread trimmer The thread trimmer consists of the movable knife 0, the fixed knife @, the lower thread finger ®, the movable knife holder 0, the knife holder presser 0 , the forked shaft 0, the thread trimmer cam lever assembly 0, the thread trimmer clutch @ , and the thread
  • Brother International DB2-B773 | Service Manual - Page 15
    (3) Movable knife holder action 0 k e ® fj 5mm By the rotation of the lower shaft, the thread trimmer clutch O pushes the roller bearing up. The motion of the roller bearing is transmitted to the forked shaft @ via the thread trimmer cam lever assembly 0. The motion is then relayed to the thread
  • Brother International DB2-B773 | Service Manual - Page 16
    3. Needle and bobbin threads trimming • (1) When the needle rises 1.8 mm above its lowest position, the rotary hook point catches the loop formed by the needle. (2) When the thread trimming signal is received, the thread trimmer clutch drives the movable knife. The needle thread is caught by the
  • Brother International DB2-B773 | Service Manual - Page 17
    0 El Tension release O O O fl 1) The thread trimmer solenoid 0 operates when the thread trimming signal is received. 2) The solenoid lever @, attached to the end of the thread trimmer solenoid 0, pushes the tension releasing lever @. 3) The tension releasing wire 0 relays the motion of the
  • Brother International DB2-B773 | Service Manual - Page 18
    to Automatic presser bar lifter mechanism (subclass -900) O O N- 1) The presser foot lifting solenoid 0 moves the link joint ® and the presser foot lifter regulating rod ® when the knee switch is pressed. 2) The presser foot lifter regulating rod © pushes up the knee lifter complying bar ® via the
  • Brother International DB2-B773 | Service Manual - Page 19
    II Lubrication mechanism 1. Upper shaft lubrication { Upper shaft 0 1) Oil fed by the pump body 0 flows into the upper shaft through the upper shaft bushing (middle) to lubricate the upper shaft bushings (left) and (right) 0. The oil sprayed inside the vertical portion of the body lubricates the
  • Brother International DB2-B773 | Service Manual - Page 20
    2. Lower shaft lubrication Lower shaft Arm channel Lower shaft 1) The oil fed by the pump 0 lubricates the lower shaft and the lower shaft bushing (left) 6). 2) Some of the oil at the lower shaft bushing (left) 6) flows through the lower shaft to lubricate the rotary hook. 0. The oil shed from
  • Brother International DB2-B773 | Service Manual - Page 21
    DISASSEMBLY El Machine covers • • I • I S., 0 • O 1) Remove the screw 0 and the needle 61. 2) Remove the three screws ®, then remove the face plate 0 and the face plate packing ®. 3) Remove the four screws O, then remove the upper cover 0 and the upper cover packing O. 4) Remove the six
  • Brother International DB2-B773 | Service Manual - Page 22
    foot, upper feed dog and upper feed crank). 4) Remove the the pin and the spring 0. 5) Remove the screw @ and the presser bar bracket thread guide m . 6) Loosen the screw m . Remove the presser bar clamp 0 by lowering the presser bar . 7) Remove the presser bar 0 from the arm top. ID Upper feed
  • Brother International DB2-B773 | Service Manual - Page 23
    El Rotary hook mechanism - 1) Tilt the machine head until it stops. 2) Remove the screw 0 and the bobbin case holder position bracket 6). 3) Loosen the three screws ® and remove the rotary hook assembly 0. ❑5 Thread trimmer CD 0 a a Washer 0 0 0 00 ® ©0 1) Remove the screw 0 and the fixed knife
  • Brother International DB2-B773 | Service Manual - Page 24
    E Feed mechanism ® 0 0 0 • CD 0 ® 0 0 B;EI-T r - J 0 S 0 O 0 0 1) Loosen the nut 0 and remove the stud screw 0. 2) Remove the wick © from the feed lifting rock shaft 0. 3) Loosen the two screws ® and remove the set collar O. 4) Loosen the screw 0 securing the feed lifting crank O. Loosen
  • Brother International DB2-B773 | Service Manual - Page 25
    LI Needle bar mechanism 0 00 000 0 1) Raise the machine head. 2) Remove the needle bar thread guide 0. 3) Remove the oil caps 0, p and 0. 4) Remove the wick from the top of the needle bar bushing (upper) ®. 5) Loosen the screw 0 then remove the needle bar
  • Brother International DB2-B773 | Service Manual - Page 26
    , put all of them into the arm. Then secure them with the screw 0. 4) Slide the slide block ® into the channel, then slide the needle bar guide clamp ® into the thread take-up lever and the slide block ®. (Be sure the chamfered side of the slide block ® is facing the inside.) 5) Pass
  • Brother International DB2-B773 | Service Manual - Page 27
    ID Feed mechanism 0 0 ® eomee B1).- b 0 'Jo arnm e e 0 1) Secure the needle plate 0 with the two screws 0. 2) Tilt the machine head until it stops. 3) Secure the feed dog @ to the feed bracket assembly 0 with the two screws ® 4) Insert the feed rock shaft O into the horizontal feed bracket
  • Brother International DB2-B773 | Service Manual - Page 28
    2) Pull the wick to the upper cover, then dangle the wick without touching any parts. NOTE: The wick length: approx. 110 mm 1) Pass the wick @ from the wick from the needle bar bushing 0 side. 2) Turn the machine pulley manually to raise the thread take-up to its highest position. 3) As shown in the
  • Brother International DB2-B773 | Service Manual - Page 29
    El Thread trimmer 0 ®mm CD 0000 9 r- p I I i © @ tt, 1) Attach the forked shaft 0 to the collar @, and attach them to the arm bed. 2) Attach the slide block O of the thread trimmer cam lever assembly 0 to the forked shaft 0 branch. Set the collar ©,the thread trimmer cam lever spring 0,
  • Brother International DB2-B773 | Service Manual - Page 30
    clutch position Turn the machine pulley until the needle bar is raised 5 mm above its lowest position. When pressing the e thread trimmer solenoid @ manually, loosen the screw @ and adjust the thread trimmer clutch so that its indent contacts the roller bearing, and so that the space between the
  • Brother International DB2-B773 | Service Manual - Page 31
    case holder position bracket 0 with the screw ®. 3) Place the needle bar thread guide ® and secure the needle 0 with the screw ®. 4) Adjust the timing between wheel 0 and the screw ® of the wheel ®. NOTE: In model DB2-87740, attach the needle plate after putting the reflector through the sensor hole
  • Brother International DB2-B773 | Service Manual - Page 32
    S Presser foot mechanism 0 0 Chamfered 15° 0 ti 0-0.5Imm 1) Raise the machine head. 2) Insert the presser bar from the top of the arm. 3) Put the presser bar clamp @ on the arm channel, insert the presser bar 0 into the presser bar clamp @, and tighten the screw @ temporarily. 4) Put the spring
  • Brother International DB2-B773 | Service Manual - Page 33
    El Upper feed mechanism 0 9 0 0 O 0 O 0 O 1) Attach the upper feed rock shaft 0 and the upper feed rock arm (upper) @ to the machine head. Then attach the upper feed rock shaft Oto the collar ©, the upper feed rock shaft 0, and the collar in that order with the screws O. 2) Tighten the
  • Brother International DB2-B773 | Service Manual - Page 34
    L7 Machine covers a • 00d_,at. I I • 1) Secure the upper tension regulator bracket 0 with the screw ®. Align the screw ® with the screw stop of the upper tension regulator bracket 0. 2) Secure the oil stopper plate ® with the two screws 0. 3) Secure the thread take-up cover @ with the screw ®. 4)
  • Brother International DB2-B773 | Service Manual - Page 35
    ADJUSTMENT ❑t Adjusting the timing between needle and rotary hook Proper timing between the needle and the rotary hook is required for the needle to rise from its down position, then to form a loop which is caught by the rotary hook point. 1. Needle bar rise Rotary hook point w Reference line
  • Brother International DB2-B773 | Service Manual - Page 36
    Adjusting the timing between needle and feed 1. Adjusting the feed dog height and angle O (D. 0 O `zrf j Q Standard r 11 2= • 0 CM= ig. A @ Front lowered Fig. A 3=112 e== 02227021 Fig. B Front raised • 2=20 Fig. Emma Feed dog height 1) When the feed dog 0 is fully raised, the standard
  • Brother International DB2-B773 | Service Manual - Page 37
    111 Adjusting the forward and backward stitch lengths [DB 2-B 773-003] Forward l; a 1 11 stitches Backward 1 • [DB241773-006] 1) Set the length control assembly 0 to mark 3. 2) Sew 11 stitches forward and backward at the inching speed (215 spm). 3) Adjust as follows when the forward and
  • Brother International DB2-B773 | Service Manual - Page 38
    LI Zeroing feed regulator and adjusting reverse lever 0 0 0 0 0 O 0.5-1 mm 1) Screw in the length control assembly 0 in the direction of the arrow so that the feed regulator is secured. NOTE: If the feed regulator 0 is still not secured, loosen the screw 0, unscrew the length control assembly
  • Brother International DB2-B773 | Service Manual - Page 39
    Adjusting the timing of upper feed horizontal movement 0 0 e I) 0 O co Upper feed dog L=E I Feed dog 1 mm 1.5 mm [DB-B774-0031 When the presser foot is positioned back [DB-B774-006] When the presser foot is aligned with the reference line 1) Maximize the upper feed amount by turning the
  • Brother International DB2-B773 | Service Manual - Page 40
    El Adjusting the timing of the upper feed vertical movement When the tips of the feed dog are raised from its lowest point to the needle plate's upper surface, the tips of the upper feed dog should touch the needle plate's upper surface. Make the following adjustment. 0 aa e Fig.A 0 0 0.5mm 0
  • Brother International DB2-B773 | Service Manual - Page 41
    [I] Adjusting presser foot brother O-\ Backward Reference line 0 O 0 6mm (I) Adjusting the clearance of the presser foot 1) The standard amount that the presser foot 0 rises, when being raised by pulling up
  • Brother International DB2-B773 | Service Manual - Page 42
    screw ® and the needle plate CI. 3) Turn the machine pulley until the needle bar is at its highest position. 4) Press the thread trimmer rod 0 manually in the direction of the arrow until the screws ® become visible. 5) Remove the screws ® and the movable knife ®. NOTE: Before removing the needle
  • Brother International DB2-B773 | Service Manual - Page 43
    Adjusting tension release 0.5 - 1 mm ( 0 Open 2 mm Begin to open e After thread trimming, if the needle thread escapes from the needle hole or if the tension discs do not close , make the following adjustment. A. If the thread escapes from the needle hole (Tension release does not function
  • Brother International DB2-B773 | Service Manual - Page 44
    CI Adjusting thread tension Decrease Shorten Lengthen 0 Increase Insufficient needle thread tension AVIV4r, / ," '74 ea. a.`ILI. Excessive needle thread tension Proper tension Decrease Increase After thread trimming, adjust the thread leader to 35-40 mm by turning the screw 0. Adjust the
  • Brother International DB2-B773 | Service Manual - Page 45
    n Adjusting synchronizer (DB2-6774) kt- Needle down position a Needle up position 19-25 mm 0-12.5 mm s O Higher • needle bar @, rotate the screws 0 in the opposite direction. Adjusting the needle down position (DB2-B774) 1) Press the pedal then release it. (The needle will stop at its down
  • Brother International DB2-B773 | Service Manual - Page 46
    I l I O1 e brother 0 • • 0 o Q) 0 O Solenoid down oid up 1) Loosen the four screws 0. Move the thread wiper solenoid @ up and down and adjust its position so that the tip of thread wiper @ does not strike the upper feed dog, presser foot, needle, and any other part. 2) After adjustment
  • Brother International DB2-B773 | Service Manual - Page 47
    13 Adjusting potentio-meter (B7740) The feed dog height is set 0.8mm prior to shipping from the factory. If the feed dog height is not 0.8 mm, the indicated pitch will be inaccurate. O 1 511At O 2 PLY mat O 6 - SEElta SEW lf,euT I a C 3 PROGRAMME O O 4 4O NO. OF MARC-: PR c. STITCH NO.
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    toI Checking feed mechanism weight (B7740) • • O O O O 0 0 a O O O Il • eC Raise the presser foot and then set the feed regulating dial to its maximum. Check that the reverse lever returns to its original position by itself after pushing the reverse lever down slowly. If it does not,
  • Brother International DB2-B773 | Service Manual - Page 49
    El Adjusting sensor position The photo-cell position needs to be adjusted when the reflector position is changed. 0 0 0 O e 0 O 0 1 SET SUET 2 06 PLY IMPIR 3 PROGRA 0EI El El
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    machine does not stop at a material edge without this adjustment. The distance is measured when the feed amount is 0. El EXEDRA • brother o,° L° 0 6 2 SET r- PLY STAN SENSOR IMVT 0 7 6 3 PROGRAMME O 4 El El El 0 1 NEXT NO. OF STM:N Innrn rsl5Lsawl TN= o 4O +0.5 MARGIN WM. X NO OTT
  • Brother International DB2-B773 | Service Manual - Page 51
    REPLACEMENTS El Replacing Solenoids Remember where the solenoid cords are attached when disconnecting them. Attachment is done in the reverse order of the removal. 1. Thread trimmer solenoid oe / 1) Disconnect the terminal pin (male) from pins 4 and 5 of the nylon connector 12P. 2) Tilt the machine
  • Brother International DB2-B773 | Service Manual - Page 52
    , the washer @ and the plunger O. 5) Remove the reverse solenoid 0 by removing the two screws O. 6) Replace the reverse solenoid assembly (code: 154727-001). [DB2-B7440] 1111 0 0 we) O 1) Disconnect the terminal pin (male) from pins 10 and 11 of the nylon connector 12P. 2) Remove the three screws
  • Brother International DB2-B773 | Service Manual - Page 53
    3. Thread wiper solenoid, thread wiper switch O r T ac® ef_/ 2c11 0 00 Thread wiper solenoid 1) Disconnect the terminal pin (male) from pins 7 and 8 of the nylon connector UP. 2) Remove the cords from the two cord holders ® by loosening the two screws 0. 3) Remove the solenoid cover ® by removing
  • Brother International DB2-B773 | Service Manual - Page 54
    7 Replacing tension release wire .4 0 0® O o O 0 Approx. 5 mm Removal 1) Remove the nut 0. 2) Remove the rear cover 0. 3) Remove the face plate ®. 4) Loosen the screws 0 and ®. 5) Remove stop ring E ®. Remove the tension release wire 0 and the tension release link assembly ®. 6) Remove stop ring E
  • Brother International DB2-B773 | Service Manual - Page 55
    Replacing photo-cell and reflector (B7740) Cautions for replacing the sensor 45. 8trim 18Thm 25.in CO 4, 2111N The distance between the needle hole and the sensor can be changed within the range of 18-25 mm. Be sure to change the photo-cell and reflector together. Do not damage the cover when
  • Brother International DB2-B773 | Service Manual - Page 56
    2. Replacing reflector Pass the cord as shown in the figure below. 0 ...---- _--- 0 N. .. Nylon connector 6p 1) Remove the needle by loosening the screw. 2) Remove the sensor guard and the presser foot by loosening the screw. 3) Remove the slide plate. 4) Remove the needle plate by removing
  • Brother International DB2-B773 | Service Manual - Page 57
    packing O and the synchronizer assembly @ on the upper shaft bushing (right) O. 2) Secure the synchronizer supporter 0 and the packing with the two screws @. (Make sure the synchronizer assembly 0 can be moved manually.) 3) Tighten the screw and washer 0 temporarily at the middle of the long hole in
  • Brother International DB2-B773 | Service Manual - Page 58
    Thread wiper The code of the thread wiper set is 183554-001. Attaching the thread wiper O e • e brother 0 0 0 0 4 0 em No 7 No8 1) Attach the thread wiper solenoid assembly 0 to the machine dog, presser foot, needle, and any other part. 2) After adjustment, tighten the screw O . -54-
  • Brother International DB2-B773 | Service Manual - Page 59
    attach the screw @ , the knee lifter lever spring wand stop ring E 9) Pinch the knee lifter lever spring 0 between the knee lifter lever 0 and the upper part of the arm. 10) Replace the knee lifter complying bar with the knee lifter complying bar assembly @ . 11) Fasten the knee lifter complying bar
  • Brother International DB2-B773 | Service Manual - Page 60
    0, the knee lifter lever spring ® and the stop ring 0. ® 10) Pinch the knee lifter lever spring © between the knee lifter lever and the upper part of the arm. 11) Replace the knee lifter complying bar ® with the knee lifter complying bar assembly ©. 12) Fasten the knee lifter complying bar assembly
  • Brother International DB2-B773 | Service Manual - Page 61
    8 mm t 1 -2 mm a to 15.2mm 15 mm Adjusting the presser foot height Loosen the nut a Adjust the presser foot lifter regulating rod @ so that the maximum rise of the presser foot is 8 mm when the presser foot lifting link t is functioning. (The play between the presser foot lifting link @ and the
  • Brother International DB2-B773 | Service Manual - Page 62
    Attaching the knee lifter switch @ Black Black White Red White No. 2 Black No. 5 White 1) Attach the knee lifter switch 0 to the table with the screw €1. (Refer to the figure in page 55 or 56.) 2) Connect the tips of the knee lifter switch code @ with the terminal pins 2 (black) and 5 (white)
  • Brother International DB2-B773 | Service Manual - Page 63
    TROUBLESHOOTING GUIDE III Machine head Problem Cause Check Solution Page Needle breakage Improper needle reattachment Bent needle. Blunt needle tip, jammed eye. Needle facing, height Needle Reattach needle. Replace needle. Improper
  • Brother International DB2-B773 | Service Manual - Page 64
    Problem Cause Check Solution Page Thread breaks --I Burr in thread path frays, dBlunt needle tip Improper needle instal lation Wrong needle for application Bent needle , blunt
  • Brother International DB2-B773 | Service Manual - Page 65
    Problem Cause Check Solution Page Needle thread does not tighten. Bobbin thread does not tighten. Insufficient needle thread tension Excessive needle thread tension Excessive needle thread
  • Brother International DB2-B773 | Service Manual - Page 66
    Problem Cause Check Solution Page Needle thread escapes at sewing start. Thread 41 stop position. Replace thread 47 trimming solenoid. Check circuits. Refer to motor adjustment manual. Adjust pretension. 40 Replace with presser foot have back channel. Adjust operating time. Adjust
  • Brother International DB2-B773 | Service Manual - Page 67
    Problem Cause dImproper thread wiper facing Thread wiper does not wipe thread. Thread wiper strikes needle dThread wiper does not operate. ._]Thread wiper operation is too
  • Brother International DB2-B773 | Service Manual - Page 68
  • Brother International DB2-B773 | Service Manual - Page 69
  • Brother International DB2-B773 | Service Manual - Page 70
    BROTHER INDUSTRIES, LTD. HEAD OFFICE: No. 35, 9-CHOME, HORITA-DORI, MIZUHO-KU, NAGOYA, JAPAN 461 CABLE: BROTHER NAGOYA, TELEX: 4473696 BROS J I9030354H 0 Printed in Japai
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SERVICE
MANUAL
FOR
DB2-B773
DB2-B774
DB2-B7740
SINGLE
NEEDLE
ADJUSTABLE
TOP
AND
BOTTOM
FEED
LOCK
STITCH
MACHINE