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