Pfaff Creative 4874 Bedienungsanleitung

4874

SERVICE MANUAL

TABLE OF CONTENTS

A.  General directions and recommendations

B.  Recommendations

C.1-2. Mechanical sewing disorders

D.1-3. Test program - test of LCD display

E.1-2. Test program - tension settings - fine tuning

F.1-2. Error code

G.1-3. Gauge for the after - sales service

1. Removing back cover

2.  Removing front cover

3.a-e.  Removing LCD UNIT and connections for Main & LCDPCB

4.a-b. Angular position of balance weights and position of eccentrics

5.a-b. Height and alignment of cloth presser bar

6.a-b. Height and orientation of needle bar in relation to the needle plate holes

7.  Height - clearance - angular position of lower looper

8.  Clearance of needle guards

9.a-b.  Timing of lower looper

10.  Angular position of upper looper

11.  Clearance and timing of upper looper to lower looper

12.a-d. Chain looper : angular position - clearance - orbital timing - clearance of 

 chain needles guards

13. Chain looper thread take up rotary cam

14. Height of feed dog

15.a-b.  Moving cutter and vertical feed timing

16.a-b.  Horizontal feed timing against chainstitch needle

17. Adjustment for differential feed unit operated with stepping motor

18.  Position of fixed cutter and cutting width dial setting

19.  Position of loopers threads take up lever

20.  Position of the stitch width finger

21.  Lateral and front covers safety device

22.a-b.  Adjustment of setting position for en-sensor and slit-plate

23.  Adjustment for stitch length unit operated with step motor

24.  Timing adjustment for Top Cover Triangle Thread Guide and Top Cover 

 Hook

25.  Adjustment of threads take up lever for Top cover and Deco cover

26.  Installing of Deco unit

27.a-b.  Adjustment for Deco unit

28.  Cover hem stitch being pulled

TABLE OF CONTENTS 2

29.a-b.  Irregular loop formation on the chain needles (cover hems)

30.  Cover hem stitch formation (Narrow & Wide)

31.  Triple cover hem stitch formation

32.a-c.  Top cover stitch formation (Prog.21~23)

33.a-g.  Deco cover stitch formation (Prog.24~30)

GENERAL DIRECTIONS AND RECOMMENDATIONS A

Safety

For safety reasons, the sewing machine must be disconnected from the mains:

- Whenever the machine is left unattended

- Whenever preparing the machine for sewing

- Whenever servicing

- Whenever replacing mechanical or electrical parts or accessories

Needles

Usually needles of the system 130/705 H may be used. However, in certain cases stitch

quality may be improved by using type ELX 705 needles.

Choose needle size Nm 80 for sheer materials and Nm 90 for normal or thick materials.

Threads

Choose a good quality polyester thread or blended thread.

Lubrication

Besides the 2 oiling points marked in red, the machine is equipped with self-lubrication

bearings and parts. Lubricate the machine as follows: when using it for the first time - if it

has not been used for some time - when it has been intensively during 7 to 8 hours.

RECOMMENDATIONS B

1. Never connect the machine to a different voltage than tha t marked on the specification

plate.

2. For safety reasons, never perform any repairs on the powe r supply circuit without first

removing the mains lead from the machine.

3. Before replacing the LCD display PCB unit, check by means of the test program.

4. Never plug in or run the machine unless all the connections are correctly set.

5. After replacing the main control PCB unit, it is necessar y to recheck the speeds. Use a

small screwdriver with insulated blade to avoid short-circuits.

6. When changing the light bulb, it is neccessary to disconnect the mains lead.

MECHANICAL SEWING DISORDERS C1

First of all, please refer to the paragraph entitled "maintenance" in the instruction manual,

especially when machine does not turn freely by turning the flywheel by hand. If necessary,

check and adjust tightness of motor belt.

Given below are the most frequent disorders. In most cases, they can be remedied by

checking the adjustments in the following order. However, before checking the adjustments,

make sure that the threading is correct and that all the thread passages are okay.

1. Skipped overlock stitches

Check and adjust if necessary:

- Needle bent or with a dull point - replace needle

- Needle not set correctly - refer to "changing the needle" in the instruction manual

- Burrs on upper or lower looper - polish

- Burrs on stitch tongue - polish

- Excessive tension on the needle thread

- Height and orientation of needle bar

- Clearance between point of lower loopers and needle

- Clearance between upper and lower loopers

- Timing of upper and lower loopers against needle

- Feed timing

2. Skipped chainstitches - Cover hems

Check and adjust if necessary:

- Needle and chain looper thread tensions not balanced

- Needle bent or with a dull point - replace needle

- Needle not set correctly - refer to "changing the needle" in the instruction manual

- Burr on chain looper - replace or polish

- Dull blade edge on moving cutter - replace

- Chain looper needle clearance

- Chain needle guard clearance

- Angular position of chain looper

- Orbital timing of chain looper

- Chain thread take up lever timing

- Height and orientation of needle bar

- Needle plate spring plate bent

Clearance and position between back of chain looper and need le L0

Note: For more information, see pages 28-31.

MECHANICAL SEWING DISORDERS C2

3. Thread breakage

Before checking the adjustment, make sure of the good quality of the thread and the needle,

the correctness of threading and the smoothness of all the thread passages. Quite often, an

injury to thread passage is the cause of thread breakage. If all these points are in order, check

the following:

- Dull point of needle or bent needle - replace.

- Dull or burred point of looper - replace.

- Scratch or injury on stitch tongue of needle plate - replace.

- Too strong thread tension.

- Unsmooth or injured edge of needle hole on needle plate (thread breakage of chain stitches)

- replace.

4. Irregular stitches

- Inadequate setting of thread tensions - re-adjust.

- Unsmooth thread passage - polish.

- Height of feed dog.

- Position of looper thread take up levers and thread guides.

- Dull blade edge of moving cutter - replace.

- Injury on needle plate face or presser foot sole - replace.

- Incorrect alignment of pulled-up thread antenna with spool pins - reset it at correct position

to align to spool pins.

5. Breakage of needle

Check and adjust if necessary

- Dull point of needle or bent needle - replace.

- Incorrect placement of needle - refer to "changing the needle" in the instruction manual.

- Clearance of needle guard and (chain needle).

- Incorrect alignment of needle holes of presser foot and needle plate.

- Clearance from needle to lower looper.

- Clearance between the upper and lower loopers.

- Feed timing.

- Horizontal feed timing against chain-stitch needle.

TEST PROGRAM - TEST OF LCD DISPLAY D1

PROG.

1 2 3 45

Access to the test program

1. Switch off the machine.

2. While pressing key "2" and "3" simultaneously, switch on the machine.

3. The matrix pattern turns to "LCD test mode".

4. Press "1", the step motors will rotate to their minimum position and the number "12" will

appear on the display.

Tension value can be checked and adjusted as a manner shown in the page E1.

TEST PROGRAM - TEST OF LCD DISPLAY D2

5. Press "1" again, the step motors will rotate to their maximum position and the number "48"

will appear on the display.

Tension value can be checked and adjusted as a manner shown in the page E1.

6. Press "1" again, the display becomes

7. Press "1" again, the display becomes

8. Press "1" again, the display becomes

9. Press "1" again, the display becomes

TEST PROGRAM - TEST OF LCD DISPLAY D3

10. Press "1" again, the display becomes

11. Press "1" again, the display becomes

12.Press "1" again, nothing is displayed

13. Press "1" again, all symbols are displayed

14. Press "1" again, Program version number is displayed



Note: It is also possible to proceed with above tests in reverse sequence by pressing key "2"

instead of key "1".

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