Singer Confidence 7463 Service Manual
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Singer Confidence 7463 Service Manual

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Confidence
7463
7465
7467
7469
Service Manual
104 72 89-26
16 Oct 2007

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Summary of Contents for Singer Confidence 7463

  • Page 1 Confidence 7463 7465 7467 7469 Service Manual 104 72 89-26 16 Oct 2007...

  • Page 2: Table Of Contents

    INDEX Sec. 1 Disassembling of covers - - - - - - - - - - - - - - - - - - - - - - 4-9 Sec. 2 Test mode - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10-12 Sec.
  • Page 3 Sec. 19 Electrical parts area AC power board - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45 CPU board - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -46-48 Switch board - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49-53 Wiring harness - - - - - - - - - - - - - - - - - - - - - - - - - - - - -54-56 - 3 -...

  • Page 4: Sec.1 Disassembling Of Covers

    Sec.1 Disassembling of covers (1) Face cover side Remove screw A. Remove screw Ｂ. (2) Back cover side Remove two self-tapping screws. - 4 -...
  • Page 5 Remove two screws F & G. Remove screw H. Loosen screw J with washer. Remove screw K on bottom side. - 5 -...
  • Page 6 Remove screw L on bottom side. Remove needle plate by loosening two screws. Push up front cove to open inserting Small screw driver between front and back covers. Open back and front covers. - 6 -...
  • Page 7 Pull out front cover. Open mating portion of front and back covers using small screw driver. Push back cover by small screw driver. 40mm Force front cover open by small screw driver. - 7 -...
  • Page 8 Lift up front cover as illustrated. Lift up front cover as illustrated. Lower presser foot lever to remove back cover easily. - 8 -...
  • Page 9 Disassembling of covers for model 7422 An additional bottom cover is provided on model 7422. Remove screws S for front cover and then 5 screws on the bottom cover. Bottom cover Disassembling of covers for model 7424・7426・7428 *7436 An additional bottom cover is provided on model 7424, 7426 ,*7436 and 7428. Remove screws S for front cover and then 6 screws on the bottom cover.

  • Page 10: Sec.2 Test Mode

    Sec.2 Test mode 1. Push bobbin winder to the right 2. Push and hold reverse switch in place. 3. Turn on power switch. 4. Release bobbin winder while pushing reverse switch, just after power switch is turned on. 5. LED is lit at the top left corner. 7422, 7442, 7424, 7444, 7462...
  • Page 11 Note: Above operation is to be done in the following manner. Steps 1 to 3 Steps 4 to 5 Release bobbin winder by the time when LED is lit at extreme right line. - 11 -...
  • Page 12 Test mode; Mode 1: In case of model 7422, 7442 and 7462, push switch at top right corner after machine is under test mode as described above, and pattern LED will be lit at top left corner. In case of other models, push pattern switch at top left corner after machine is under test mode and the switch will be lit.

  • Page 13: Sec. 3 Adjustment Of Feed Dog Height

    Adjustment of feed dog height Sec. 3 Checking: 1. Move feed dog to its highest position by turning hand wheel. Check to see if feed dog height is as illustrated below. 0.9 – 1.0 mm Adjustment: 1. Remove needle plate. Loosen nut with wrench. 2.

  • Page 14: Sec. 4 Needle Bar Height

    Sec. 4 Needle bar height Note: Make this checking before checking “Needle timing to shuttle” Checking: 1. Remove needle plate and bobbin case. Select straight stitch (center needle position). Raise needle to its highest position by turning hand wheel. 2. Check to see if distance from needle point to the surface of needle plate is as illustrated below.

  • Page 15: Sec.5 Needle Threader Height

    Sec.5 Needle threader height Checking: 1. Select straight stitch at center needle position. 2. Raise needle to its highest position by rotating hand wheel towards you. 3. Lowering needle threader lever (A), check and see if hook is inserted into the needle hole. Adjustment: 1.
  • Page 16 ＊Insert the hook into the upper side of needle hole at all times as the smaller needle size, the shorter needle hole. Insert the hook into the Hook upper side of needle hole. 7. If the direction of insert hook is deviated from right position. ・Adjust the hook position with the attached small screw driver.

  • Page 17: Sec. 6 Presser Foot Height And Direction

    Sec. 6 Presser foot height and direction 5.6 mm Checking: 1. Lower the feed dog below the needle plate. 2. Raise the presser foot lever. 3. Check and see if clearance between the needle plate and the presser foot is about 5.6mm. Adjustment: 1.

  • Page 18: Sec. 7 Needle Position At Zigzag Stitching

    Sec. 7 Needle position at zigzag stitching Checking: 1. Set test mode at 1. 2. Turn hand wheel by hand and see if needle leaves the same clearance at both right and left end of needle plate hole. a＝b Adjustment: 1.

  • Page 19: Sec. 8 Clearance Between Needle And Shuttle

    Sec. 8 Clearance between needle and shuttle Note: Make this checking before checking “Needle timing to shuttle” Checking: 1. Remove needle plate, bobbin case and face cover. 2. Set test mode at 1. 3. Shift shuttle hook at the rear of needle by turning hand wheel. Check to see if needle clearance to shuttle is within 0.05 to 0.15 mm.
  • Page 20 2. If needle clearance to shuttle at right and left position is not same, adjust position of fulcrum for needle swing support . Loosen bolt located under bottom of support plate and adjust position of fulcrum. Do not loosen this screw. 3.

  • Page 21: Sec. 9 Needle Timing To Feed Dog

    Sec. 9 Needle timing to feed dog Note: After adjustment, be sure to follow “Needle timing to shuttle”. Checking: 1. Turning hand wheel, bring needle bar to it’s highest position. 2. Check to see if feed dog starts to move when needle starts to go down by turning hand wheel towards you.

  • Page 22: Sec. 10 Needle Timing To Shuttle Hook

    Sec. 10 Needle timing to shuttle hook Check “Needle timing to feed dog” and “Needle bar height” beforehand. Checking: 1. Set mode at 1. 2. Remove needle plate. Check to see if needle is not bent. 3. Move needle to left position by turning hand wheel. Raise needle from its lowest position slowly and check if distance is as illustrated below, when point of shuttle hook aligns with right side of needle.

  • Page 23: Sec. 11 Needle Stopper At Right Position

    Sec. 11 Needle stopper at right position Note: Before checking, follow section “Needle position at zigzag stitching“ Checking: 1. Set test mode at 1. Remove face cover. 2. Bring needle to right position. 3. With needle bar touched with stopper at right side, check to see if needle collides with presser foot and needle plate.

  • Page 24: Sec. 12 Adjustment Of Thread Tension

    Sec. 12 Adjustment of thread tension Checking: 1. Set thread tension at the center of “AUTO” position. 2. Pull thread between tension discs and check thread tension value using 100 gr. tension gauge. Measured value should be 40 to 50 g. *When tension gauge is not available, do actual sewing and check balance of upper and lower threads.

  • Page 25: Sec.13 Zigzag Bight & Stitch Balance

    Sec.13 Zigzag bight & stitch balance Zigzag bight Checking meshing position of gears This procedure is needed only when disassembling and re-assembling cams. (1) Checking Remove face cover and turn off power switch. Rotate gear (a) clockwise until it stops with long projection touched with shaft. Check to see if end (c) of zigzag cam (b) aligns with center of gear (a).
  • Page 26 Screw on motor gear Adjustment In case of small deviation from correct zero feed, adjust as follows: *It is recommended to use SINGER test needle when checking Zero feed. 1. Turn off power switch. 2. Loosen one of two screws on motor gear.
  • Page 27 3. Set machine at test mode 2 [Zero feed］. 4. Loosen other screw on motor gear for adjustment. 5. Adjust by moving the motor gear in either direction with 1.5 mm hex driver running machine with a little thick paper placed under presser foot. <Fine adjustment mechanism is available for stitch length according to models>...
  • Page 28 Origin point positioning of stitch length In case of large deviation, adjust as follows: Note: There are two stitch length mechanisms – half-step and full-step versions. (A) Stitch length (Half-step version) *Stitch length mechanism on half-step version Step motor rotates 7.5 degrees with one pulse and this amount of rotation makes feed regulator rotate 3 degrees under ratio of 1 : 2.5 of motor gear vs feed regulator gear.
  • Page 29 6. Temporarily tighten one screw which is located for easier access for adjustment. 7. Set machine at test mode 2 [Zero feed] again by turning on power switch. 8. A ctivate the origin point positioning of feed motor by turning hand wheel manually. 9.
  • Page 30 1. Turn off power switch. 2. Loosen one of two screws on motor gear. 3. Turn on power switch and set machine at test mode 2 [Zero feed] and motor shaft will be held at one of exciting position. 4. Loosen other screw on motor gear for adjustment and motor gear will become free from motor shaft.
  • Page 31 7428, 7448 and 7468 – zigzag stitch with stitch length at 0.25, honeycomb stitch #44 at default position and dog pattern #89. 5. Make fine adjustment to obtain feed balance for each pattern. Use fine adjustment mechanism, if available. 6. Tighten screws on motor gear securely after adjustment. NOTE: Check which is the machine serviced, half-step or full-step version following photographs below.
  • Page 32 Meshing motor gear with feed regulator gear When meshing motor gear with feed regulator gear again, follow procedures below: A. Half-step version Mesh these gears so that centers of feed regulator and motor gear and concave hole may be positioned in alignment Concave portion Almost straight line B.
  • Page 33 DETAILS OF TECHNICAL ASPECTS OF FEED CONTROL AND ZIGZAG BIGHT CONTROL UNITS FEED CONTROL UNIT - Half step version A. Position of pulse motor gear at origin point Rotational ratio of gear (A) vs pulse motor gear (B) is 1:2.5. Rotation of motor gear (A) is 1/2 step per 1 pulse and 3.75 (7.5 divided by 2) degrees resulting in the gear (B) rotated at 1.5 (3.75 divided by 2.5) degree.
  • Page 34 C. Position of feed regulator at zero feed Position of feed zero is shifted with 20 pulses from the origin point and motor gear (A) is rotated at 75 (20 multiplied by 3.75) degrees. Motor gear (B) is rotated at 30 (20 multiplied by 3.75 divided by 2.5) degrees.
  • Page 35 FEED CONTROL UNIT - Full step version A. Position of pulse motor gear at origin point Rotational ratio of gear (A) vs pulse motor gear (B) is 1:5. Rotation of motor gear (A) is 7.5 degrees (1 step per 1 pulse) resulting in the gear (B) rotated at 1.5 (7.5 divided by 5) degree. There are 48-step exciting positions (segments) with 7.5 degree rotation per 1 step on the pulse motor.
  • Page 36 C. Position of feed regulator at zero feed Position of feed zero is shifted with 20 pulses from the origin point and motor gear (A) is rotated at 150 (20 multiplied by 7.5) degrees. Motor gear is rotated at 30 (20 multiplied by 7.5 divided by 5) degrees. D.
  • Page 37 ZIGZAG BIGHT CONTROL UNIT A. Position of pulse motor gear at origin point Rotational ratio of Motor pinion gear (A) vs zigzag cam gear (B) is 1:1. Rotation of motor gear (A) 1/2 step per 1 pulse and 3.75 degrees (7.5 divided by 2) resulting in the gear (B) rotated at 3.75 degrees. There are 48-step exciting positions (segments) with 7.5 degree rotation per 1 pulse on the pulse motor.
  • Page 38 B. Needle at right position Needle at right position is the position with 2 pulses shifted from the origin point resulting in the gear (B) and gear (A) rotated at 7.5 (3/75 multiplied by 2) degrees. Needle position is located at 3.5 mm from center. C.

  • Page 39: Sec. 14 Needle Stops At Heighest Position

    Sec. 14 Needle stop at highest position Needle always stops at its highest position. This is controlled by sensor cam and sensor located on main shaft. Checking: 1. Raise needle to its highest position by turning hand wheel. 2. Push bobbin winder to the right. 3.

  • Page 40: Sec. 15 Bobbin Holder Stopper Spring

    Sec. 15 Bobbin holder stopper spring Remove needle plate, bobbin case and retaining bracket beforehand. 1. Place the retaining bracket aligning corner of plate spring with inside of wall (A) of shuttle race as illustrated below and tighten the fixing screw temporarily. 2.
  • Page 41 3. Adjust the position of reverse rotation stopper so that there may be a clearance of 1 to 1.5 mm between the projection and plate spring while turning the bobbin case back and forth. Tighten the fixing screw securely. 4. Place the bobbin cover plate into position. Added : November, 2006 - 41 -...

  • Page 42: Sec. 16 Motor Belt Tension

    Sec. 16 Motor belt tension Adjustment 1. Remove the front cover. 2. Loosen two nuts (A) and adjust belt tension so that belt maybe bent about 5 mm when it is pushed by pressure of 100g between upper shaft and motor. 3.

  • Page 43: Sec. 17 Timing Belt Tension

    Sec. 17 Timing Belt tension Adjustment 1. Remove face cover. 2. Loosen the screw (A) on idler pulley bracket. 3. Tighten the screw (A) after checking the belt tension. Note: Be sure to recheck “Needle Timing to shuttle” after adjustment. Added : November, 2006 - 43 -...

  • Page 44: Sec. 18 Bobbin Holder Thread Tension

    Sec. 18 Bobbin holder thread tension Do not adjust the screw as it is set in the factory. Standard tension: 16g (±1) Added : November, 2006 - 44 -...
  • Page 45 Sec. 19 Electronic component area AC Power Board Component number is for 120V spec. and for 230V spec. 87530 87553 Be sure to check number printed on board. Transformer Secondary 5P Connector cord Connect with CPU LED lamp harness Main motor DC 120v Transformer YM-45D Primary...
  • Page 46 CPU Board – 1 (for model 7422, 7442 and 7462) Component number for half-step version is 87520. Be sure to check number printed on board. 87520 Motor for needle swing Motor for material feeding Cam sensor harness 5P connector cable Bobbin winding switch Connected with...
  • Page 47 CPU Board – 2 (other models) Component number for half-step version is 87555 and for full-step version is 87585. Be sure to check number printed on board. 87555 Motor for needle zigzag Motor for material feeding Not use Cam sensor harness 5P connector cable Bobbin winding switch Connect with AC board...
  • Page 48 CPU Board – 3 (other models) Addition Component number for half-step version is 87555 and for full-step version is 87585. Be sure to check number printed on board. 87585 Motor for needle zigzag Motor for material feeding Not use Cam sensor harness 5P connector cable Bobbin winding switch Connect with AC board...
  • Page 49 Switch Board – 1 (for model 7422, 7442 and 7462) Component number is . Check number printed on board. 87526 13P Connector Connect with CPU 4P Connector Connect with CPU - 49 -...
  • Page 50 Switch Board – 2 (for 7446, 7466, 7444 and 7464) Component number for 7446 and 7466 is . for 7444 and 7464 is 87547 87533 87533 is the one where jumper wire is cut on 87547 Component number printed on board is on both boards.
  • Page 51 Switch Board – 3 (for 7426 and 7424) Component number for 7426 is and for 7424 is 87563 87562 87562 is the one where jumper wire is cut on 87563 Component number printed on board is on both boards. 87563 13P Connector Connect with CPU Twin needle select...
  • Page 52 Switch Board – 4 (for 7428 ＊7436) Component number is for 7428, * for *7436. 87564 87578 Be sure to check number printed on board. 13P Connector Connect with CPU Twin needle select SW & needle stop select SW 12 Switches 4P Connector Connect with CPU 4P Connector...
  • Page 53 Switch Board – 5 (for 7448 and 7468) Component number is 87548 Be sure to check number printed on board. 13P Connector Connect with CPU 4P Connector Connect with CPU 12 Switches 4P Connector Connect with CPU Twin needle Select SW Needle stop position select SW - 53 -...
  • Page 54 Wiring diagram - 54 -...
  • Page 55 ＊7436 - 55 -...
  • Page 56 - 56 -...
  • Page 57 Parts list for feed control unit of half-step version without fine adjustment mechanism for CB1 model to be used with circuit board #87520 Name Part no. 1 Motor bracket 87123 2 Metal bush 87176 3 Feed regulator 87229 4 Pinion gear 87246 5 Pulse motor 87600...
  • Page 58 Parts list for feed control unit of half-step version with fine adjustment mechanism for CB2/3/4 model to be used with circuit board #87555 Name Part no. 1 Motor bracket 87147 2 Metal bush 87178 3 Feed regulator 87229 4 Pinion gear 87246 5 Pulse motor 87600...
  • Page 59 Parts list for feed control unit of full-step version with fine adjustment mechanism for CB2/3/4 model to be used with circuit board #87585 Name Part no. 1 Motor bracket 87148 2 Metal bush 87178 3 Feed regulator 87254 4 Pinion gear 87253 5 Pulse motor 87600...

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