Singer 7285Q Manuale utente
Page 1/38
Original issue
May, 2014
Service Manual
7285Q
Model
Original issue: May 2014
Jaguar International Corporation
Page 2/38
Original issue
May, 2014
Service Manual
7285Q
Model
INDEX
1. Disassembling of covers
2. Adjustment of feed dog height
3. Needle bar height
4. Needle threader height
5. Presser foot height and direction
6. Needle position at zigzag stitching
7. Clearance between needle and shuttle
8. Needle timing to feed dog
9. Needle timing to shuttle hook
10. Adjustment of thread tension
11. Tension of timing belt
12. Motor belt tension
13. Retaining bracket for bobbin case
14. Origin point positioning of zigzag bight
15. Stitch length
16. Needle stop at highest position
17. Electronic component area
*AC Power board
*CPU /switch board
18. Wiring diagram
19. Part list for feed control unit
20. Helpful messages (Supplement)*
Page 3/38
Original issue
May, 2014
Service Manual
7285Q
Model
1. Disassembling of covers
(1) Face cover side
(2) Bottom cover side
A
B
Remove screwA.
Remove screw B.
Loosen five screws.
Page 4/38
Original issue
May, 2014
Service Manual
7285Q
Model
1. Disassembling of covers –continued--
(3) Back cover side
Remove two self-tapping screws.
Remove two screws.
Remove self-tapping screw.
Page 5/38
Original issue
May, 2014
Service Manual
7285Q
Model
1. Disassembling of covers –continued--
(4) Front cover side
A
Push up front cover to open inserting
small screw driver between front and
back covers.
Loosen screw A.
Open back and front covers.
Page 6/38
Original issue
May, 2014
Service Manual
7285Q
Model
1. Disassembling of covers–continued--
.
Pull out front cover.
Open mating portion of front and back
covers using small screw driver.
Push back cover by small screw driver.
Force front cover open by small screw driver.
Page 7/38
Original issue
May, 2014
Service Manual
7285Q
Model
1. Disassembling of covers –continued--
Force front cover open by small screw driver.
Lift up front cover as below.
Page 8/38
Original issue
May, 2014
Service Manual
7285Q
Model
2. Adjustment of feed dog height
Checking:
1. Move feed dog to its highest position by turning hand wheel.
Check to see if feed dog height is as illustrated below.
Adjustment:
1. Remove needle plate. Loosen nut with wrench.
2. Adjust height by turning screw as illustrated. Tighten nut securely after adjustment.
0.9 – 1.1 mm
Page 9/38
Original issue
May, 2014
Service Manual
7285Q
Model
3. Needle bar height
Note: Make this checking before checking “Needle timing to shuttle” and
”Feed-dog timing (vertical motion)”.
Checking:
1. Select straight stitch at center needle position.
2. Remove presser foot and needle plate, and then remove bobbin case.
3. Replace needle with special needle gauge (L=29 mm).
4. Lower the needle gauge to its lowest position by turning hand wheel by hand.
Check to see if the bottom of the needle gauge aligns with shuttle race pushing
the needle lightly as shown by arrow mark.
Adjustment:
1. Remove face cover.
2. Loosen screw (A) of needle bar clamp using hex screw driver
and adjust the height of needle bar.
Lowest position of
Needle
Needle position
at center
A
Needle gauge L =29 mm
Shuttle race
Page 10/38
Original issue
May, 2014
Service Manual
7285Q
Model
3. Needle bar height –continued--
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.
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