Singer Curvy 8763 Service Manual
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Singer Curvy 8763 Service Manual

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8763
8770
Service Manual
104 72 90-26
4 March 2008

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Summary of Contents for Singer Curvy 8763

  • Page 1 8763 8770 Service Manual 104 72 90-26 4 March 2008...
  • Page 2 Original issue Service Manual Dec.2007 Page 2/47 Model INDEX COSMO-II series 1. Disassembling of covers 2. Test mode 3. Adjustment of feed dog height 4. Needle bar height 5. Needle threader height 6. Presser foot height and direction 7. Needle position at zigzag stitching 8.
  • Page 3 Original issue Service Manual Dec.2007 Page 3/47 Model 1. Disassembling of covers COSMO-II series (1) Face cover side Remove screw A. Remove screw Ｂ. (2) Bottom side Loosen three screws.
  • Page 4 Original issue Service Manual Dec.2007 Page 4/47 Model 1. Disassembling of covers –continued-- COSMO-II series Remove a screw on front cover. 外す。 Remove a screw inside of access hole of front cover. Don’t remove screws above and Below the access hole Remove cap for fine adjustment on assembly.
  • Page 5 Original issue Service Manual Dec.2007 Page 5/47 Model 1. Disassembling of covers –continued-- COSMO-II series (3) Back cover side Remove two self-tapping screws. Remove two screws Remove self-tapping screw.
  • Page 6 Original issue Service Manual Dec.2007 Page 6/47 Model 1. Disassembling of covers –continued-- COSMO-II series Remove screws (A & B) on pre-tension unit. Pre-tension unit is removed. (4) Front cover side Loosen screw A.
  • Page 7 Original issue Service Manual Dec.2007 Page 7/47 Model 1. Disassembling of covers –continued-- COSMO-II series Open back and front covers. Push up front cover to open by inserting small screw driver between front and back covers. Open mating portion of front and back covers by pushing back cover with small screw driver.

  • Page 8: Test Mode

    Original issue Service Manual Dec.2007 Page 8/47 Model 2. Test mode COSMO-II series 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.
  • Page 9 Original issue Service Manual Dec.2007 Page 9/47 Model 2. Test mode -- continued -- COSMO-II series (A) Model 8763 Release bobbin winder by the time when LED is lit at extreme right line. 5. Select key 1 by pushing switch at right Key 1 is mode 1.
  • Page 10 Original issue Service Manual Dec.2007 Page 10/47 Model 2. Test mode -- continued -- COSMO-II series (B) Model 8763 Release bobbin winder while keeping pushing reverse stitch button. Selecting test mode (a) Push one of 5 buttons below LCD display to select test mode 1 to 5. Modes 4 and 5 are for factory use only.

  • Page 11: Adjustment Of Feed Dog Height

    Original issue Service Manual Dec.2007 Page 11/47 Model Adjustment of feed dog height COSMO-II series 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 – 1.1 mm Adjustment: 1.

  • Page 12: Needle Bar Height

    4. Needle bar height COSMO-II series Note: Make this checking before checking “Needle timing to shuttle” and ”Feed-dog timing (vertical motion)”. Use needle Singer 90/14. Checking: 1. Select straight stitch at center needle position. 2. Remove presser foot and needle plate, and then remove bobbin case.
  • Page 13 Original issue Service Manual Dec.2007 Page 13/47 Model 4. Needle bar height –continued-- COSMO-II series 3. Tighten the screw (A) securely after adjustment. Replace needle gauge with normal needle #90/14. 4. Check to see if needle threader operates correctly and there is not interference in vertical movement of needle bar.

  • Page 14: Needle Threader Height

    Model 5. Needle threader height COSMO-II series 1. Use needle Singer 90/14. 2. Select straight stitch at center needle position. 3. Raise needle to its highest position by turning hand wheel toward you. 4. Lowering needle threader lever, check and see if hook is inserted into needle hole.
  • Page 15 Original issue Service Manual Dec.2007 Page 15/47 Model 5. Needle threader height --continued-- COSMO-II series 90/14 80/11 70/9 Insert the hook into the upper side of needle hole. Hook 7. If the direction of insert hook is deviated from correct position, adjust the hook position with the small screw driver in the accessory.
  • Page 16 Original issue Service Manual Dec.2007 Page 16/47 Model 5. Needle threader height -- continued -- COSMO-II series Hook protrudes Hook protrudes Hook protrudes too much. correctly. too little. Needle Hook Hook holder 9. If twin thread guide (H) is located much higher or lower than hook portion, needle is not threaded as shown in Fig.
  • Page 17 Original issue Service Manual Dec.2007 Page 17/47 Model 5. Needle threader height -- continued -- COSMO-II series If it doesn’t work correctly yet, adjust position of root (L) of twin thread guide (H) vertically with threading lever lowered. Position of twin thread guide and hook is shown below with threading lever lowered.
  • Page 18 Original issue Service Manual Dec.2007 Page 18/47 Model 6. Presser foot height and direction COSMO-II series Checking 5.6 mm 1. Lower the feed dog below the needle plate. 2. Raise the presser foot lever. 3. Check and see if clearance between needle plate and presser foot is about 5.6 mm. Adjustment 1.
  • Page 19 Original issue Service Manual Dec.2007 Page 19/47 Model 7. Needle position at zigzag stitching COSMO-II series 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.

  • Page 20: Clearance Between Needle And Shuttle

    Original issue Service Manual Dec.2007 Page 20/47 Model 8. Clearance between needle and shuttle COSMO-II series Note: Set machine at test mode and select mode 1 for needle at L/C/R positions. Make this checking before checking “Needle timing to shuttle”. Checking: 1.
  • Page 21 Original issue Service Manual Dec.2007 Page 21/47 Model 8. Clearance between needle and shuttle --continued-- COSMO-II series 2. If needle clearance to shuttle at right and left position is not same, adjust position of fulcrum (B) for needle swing support. Loosen bolt (C) located under bottom of support plate and adjust position of fulcrum.
  • Page 22 Original issue Service Manual Dec.2007 Page 22/47 Model 9. Needle timing to feed dog COSMO-II series Note: After adjustment, be sure to follow “Needle timing to shuttle”. As horizontal and vertical feed motion is unitized on this model, adjustment of feed timing is as follows: Checking: 1.
  • Page 23 Original issue Service Manual Dec.2007 Page 23/47 Model 10. Needle timing to shuttle hook COSMO-II series Check “Feed timing (vertical movement)” and “Needle height” beforehand. Checking 1. Set machine at test mode and select mode 1. 2. Remove needle plate. Check to see if needle is not bent. 3.
  • Page 24 Original issue Service Manual Dec.2007 Page 24/47 Model 10. Needle timing to shuttle hook --continued-- COSMO-II series 2．Tighten screws securely after adjustment. Meshing condition of shuttle race gear and lower shaft gear 1. Check meshing condition of gears after adjustment. Check play of the gear at 4 positions –each 90 degree angle of 1 rotation of shuttle race.
  • Page 25 Original issue Service Manual Dec.2007 Page 25/47 Model 11. Adjustment of timing of take-up lever to needle COSMO-II series Checking 1. Bring needle bar to its lowest position. 2. Check to see if arm of take-up lever (A) is located at position (C) where one of 3 screws on take-up operating gear plate (B) is hidden by the arm, Adjustment 1.
  • Page 26 Original issue Service Manual Dec.2007 Page 26/47 12. Adjustment of meshing position of gears for Model take-up lever COSMO-II series Checking 1. If excessive noise is generated from take-up lever, there should be a problem in meshing of take-up operating gear (A) with main shaft gear. 2.

  • Page 27: Adjustment Of Thread Tension

    Original issue Service Manual Dec.2007 Page 27/47 Model 13. Adjustment of thread tension COSMO-II series Checking: 1. Set thread tension at the center of “AUTO” position. 2. Pull thread between tension discs and check thread tension value with two twisted Polyester #50 thread.

  • Page 28: Tension Of Timing Belt

    Original issue Service Manual Dec.2007 Page 28/47 Model 14. Tension of timing belt COSMO-II series Note: This checking is needed before and after adjusting “Needle timing to shuttle”. 1. Timing belt is engaged with gears on main and lower shafts. Too weak tension may result in slippage between shuttle gear and lower shaft gear due to thread jamming, bunching and fabric snagging.

  • Page 29: Motor Belt Tension

    Original issue Service Manual Dec.2007 Page 29/47 Model 15. Motor belt tension COSMO-II series Adjustment: 1. Remove the front cover. 2. Loosen two nuts (A) and adjust belt tension so that belt may be bent about 5 mm when it is pushed by pressure of 100g between upper shaft and motor.

  • Page 30: Retaining Bracket For Bobbin Case

    Original issue Service Manual Dec.2007 Page 30/47 Model 16. Retaining bracket for bobbin case COSMO-II series 1. Remove needle plate and bobbin case. 2. Check to see if corner of plate spring aligns with inside of wall (A) of shuttle race as illustrated below.
  • Page 31 Original issue Service Manual Dec.2007 Page 31/47 Model 16. Retaining bracket for bobbin case –continued -- COSMO-II series 6. Loosen screw (C) and 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.
  • Page 32 Original issue Service Manual Dec.2007 Page 32/47 Model 17. Origin point positioning of zigzag bight COSMO-II series Checking meshing position of gears This procedure is needed only when disassembling and re-assembling cams. Checking 1. Remove face cover and turn off power switch. 2.
  • Page 33 Original issue Service Manual Dec.2007 Page 33/47 Model Origin point positioning of zigzag bight --continued-- COSMO-II series *Setting is OK if there is a room for long projection (concealed) of gear (a) to rotate. *Setting is not good if the projection has collided with zigzag cam and doesn’t move. Adjustment 1.

  • Page 34: Stitch Length

    Original issue Service Manual Dec.2007 Page 34/47 Model 18. Stitch length COSMO-II series (A) Checking meshing position of gears This procedure is needed only when disassembling and re-assembling cams. Rotate motor gear clockwise to touch it with stopper pin and mesh these gears so that feed regulator gear may be positioned with full two gears below line from feed regulator to motor gear Stopper pin...
  • Page 35 Original issue Service Manual Dec.2007 Page 35/47 Model 18. Stitch length --continued-- COSMO-II series Stopper pin Projection (1) Switch Switch is turned on. In case of large deviation, adjust as follows: Setting 1. Turn off power switch. 2. Loosen one of two screws on motor gear. 3.
  • Page 36 Original issue Service Manual Dec.2007 Page 36/47 Model 18. Stitch length --continued-- COSMO-II series Adjustment 1. Set machine at mode 2. [Zero feed] 2. Loosen fixing bolt (A) on motor bracket using 2.5 mm hex driver. 3. Turn position adjusting bolt (B) on motor bracket in either direction using 3.0 mm hex driver. running machine with a little thick paper placed under presser foot.
  • Page 37 Original issue Service Manual Dec.2007 Page 37/47 Model 18. Stitch length (Full-step version) --continued-- COSMO-II series Adjustment without removing front and rear covers 1. Lay machine on its back and remove cap with small screw driver. 2. Loosen screw (A) with L-shaped 5 mm hex driver. Turn screw (B) in either direction with minus screw driver and confirm whether adjustment is correctly done after setting up machine in position.
  • Page 38 Original issue Service Manual Dec.2007 Page 38/47 Model 19. Needle stops at highest position COSMO-II series Needle always stops at high position. This is controlled by sensor cam and sensor located on main shaft. Adjustment: 1. Raise needle to its highest position. 2.
  • Page 39 Original issue Service Manual Dec.2007 Page 39/47 Model 20. Electronic component area COSMO-II series AC Power Board 87625 is for 120V spec. and is for 230V spec. 87629 Be sure to check number printed on board. 87625 & 87629 Transformer Secondary 5P Connector cord Connect with CPU...

  • Page 40: Cpu Board

    Original issue Service Manual Dec.2007 Page 40/47 Model 20. Electronic component area -- continued -- COSMO-II series CPU Board Model 8763 Be sure to check number printed on board. 87594 Motor for needle swing Motor for material feeding Cam sensor harness Bobbin winding switch 5P connector cable Connected with AC...
  • Page 41 Original issue Service Manual Dec.2007 Page 41/47 Model 20. Electronic component area -- continued -- COSMO-II series CPU Board Model 8770 Be sure to check number printed on board. 84071 Motor for needle zigzag Motor for material feeding 84071 Not use Cam sensor harness Bobbin winding switch 5P connector cable...
  • Page 42 Original issue Service Manual Dec.2007 Page 42/47 Model 20. Electronic component area -- continued -- COSMO-II series Switch Board Model 8763 Check number printed on board. 87526 13P Connector Connect with CPU 4P Connector Connect with CPU...
  • Page 43 Original issue Service Manual Dec.2007 Page 43/47 Model 20. Electronic component area -- continued -- COSMO-II series Switch Board Model 8770 Check number printed on board. 87615 13P Connector Connect with CPU 4P Connector Connect with CPU...
  • Page 44 Original issue Service Manual Dec.2007 Page 44/47 Model 20. Electronic component area -- continued -- COSMO-II series LCD unit 87628 10P connector connect with CPU 9P connector connect with CPU...
  • Page 45 Original issue Service Manual Dec.2007 Page 45/47 Model 21. Wiring diagram COSMO-II series Model 8763...
  • Page 46 Original issue Service Manual Dec.2007 Page 46/47 Model 21. Wiring diagram – continued -- COSMO-II series Model 8770...
  • Page 47 Original issue Service Manual Dec.2007 Page 47/47 Model 22. PART LIST FOR FEED CONTROL UNIT COSMO-II series Name Part no. 1 Motor bracket 87148 2 Metal bush 87178 3 Feed regulator 87254 4 Pinion gear 87253 5 Pulse motor 87600 6 Compression spring 87191 7 M4 Phillips screw...

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