Singer 8763 CURVY Manual de usuario

Service Manual

8763

8770

104 72 90-26

4 March 2008

Page 2/47

Original issue

Dec.2007

Service Manual

COSMO-II series

Model

INDEX

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. Clearance between needle and shuttle

9. Needle timing to feed dog

10. Needle timing to shuttle hook

11. Adjustment of take-up lever timing to needle

12. Adjustment of meshing position of gears for thread take-up lever

13. Adjustment of thread tension

14. Tension of timing belt

15. Motor belt tension

16. Retaining bracket for bobbin case

17. Origin point positioning of zigzag bight

18. Stitch length (Full-step version)

19. Needle stop at highest position

20. Electronic component area

*AC Power board

*CPU board-1

*Switch board-1

21. Wiring diagram

22. Part list for feed control unit

Page 3/47

Original issue

Dec.2007

Service Manual

COSMO-II series

Model

1. Disassembling of covers

(1) Face cover side

Remove screw A.

Remove screw Ｂ.

(2) Bottom side

Loosen three screws.

Page 4/47

Original issue

Dec.2007

Service Manual

COSMO-II series

Model

1. Disassembling of covers –continued--

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.

微調整用（生産用）キャップを

Page 5/47

Original issue

Dec.2007

Service Manual

COSMO-II series

Model

1. Disassembling of covers –continued--

(3) Back cover side

Remove two self-tapping screws.

Remove two screws

Remove self-tapping screw.

Page 6/47

Original issue

Dec.2007

Service Manual

COSMO-II series

Model

1. Disassembling of covers –continued--

Pre-tension unit is removed.

(4) Front cover side

Loosen screw A.

Remove screws (A & B) on pre-tension unit.

Page 7/47

Original issue

Dec.2007

Service Manual

COSMO-II series

Model

1. Disassembling of covers –continued--

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.

Open

front cover with

smallscrewdriver.

Lift up front cover.

Page 8/47

Original issue

Dec.2007

Service Manual

COSMO-II series

Model

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.

Page 9/47

Original issue

Dec.2007

Service Manual

COSMO-II series

Model

2. Test mode -- continued --

(A) Model 8763

Mode 1 : zero feed, three needle positions (L/C/R)

Mode 2 : zero feed, center needle position

Mode 3 : 2 mm feed, center position, sews 11 stitches forward and backward.

5. Select key 1 by pushing switch at

right

Release bobbin winder by the time when LED is lit at extreme right line.

Key 1 is mode 1.

Take the same procedures for further

modes up to 3.

Page 10/47

Original issue

Dec.2007

Service Manual

COSMO-II series

Model

2. Test mode -- continued --

(B) Model 8763

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.

(b) Push one of direct selection buttons to select test mode 1 to 6. Modes 4, 5 and 6 are

for factory use only.

Mode 1 : zero feed, three needle positions (L/C/R)

Mode 2 : zero feed, center needle position

Mode 3 : 2 mm feed, center position, sews 11 stitches forward and backward.

Release bobbin winder while keeping pushing reverse stitch button.

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