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

Remove screwA.

Remove screw B.

Loosen five screws.

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Original issue

May, 2014

Service Manual

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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

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

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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