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I have a Pfaff Creative 7550. It powers up but won't stitch. If you turn the hand wheel by hand it will try to go for a second but then stop. when the needle is in the upmost postition is when it tries to run. It doesn't seem to respond when you push buttons to change the settings all the time either. Is there a reset button that needs to be reset or something? The machine was working fine when i last put it away, but it has sat for a while. What could be causing this?

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  • wysseguys Feb 07, 2010

    I have already checked the battery and its fine...that only powers the backlite anyway i think.

  • wysseguys Feb 07, 2010

    I have already checked the battery in the bottom.

  • wysseguys Feb 07, 2010

    The machine powers up- therefore there is juice/connection. The foot pedal has been tested and has power also.

  • wysseguys Feb 07, 2010

    Thanks but there is no friction, the wheel turns freely. All the linkage seems to be connected and spinning correctly. The motor only seems to engage when the handwheel is given a spin. But it only goes for a couple seconds.

  • wysseguys Feb 08, 2010

    We have come to the same conclusion that probly the brushes are bad. we can also check out your other ideas as they all sound viable....Thank you so much for all this input!! Very useful info!!

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Hi usually when there is a physical stop encountered while rotation of the wheel there is a linkage problem inside the unit.

The causes can be:

1. Worn / failed connecting rod pin(s)
2. A linkage pin retaining clip came off allowing the pin to float up and bind against something
3. Tooth drive for cloth advance linkage failure
4. Foreign object inside the machine

Your going to have to find the binding point inside your machine. If a linkage pin has floated out of position you MUST also find the lost retaining clip or risk future damage to your machine.

What ever you do DO NOT force the wheel if can be a very costly error.

Posted on Feb 07, 2010

  • Kelly
    Kelly Feb 08, 2010

    Hi again.



    From what you have said being that there is known power, the unit spins freely and that the motor starts but then stops after a few seconds it sounds as if the brushes in the electric drive motor are weak or not touching the armature completly. As far as I know you can not get just the brushes and that it requires complete replacement in kit form See below: (price lised in Euros)



    Description: DIY type complete Motor, Belt, Lead & Foot control kit
    Category: Motors
    Manufacture: Singer, Pfaff, Bernina, Brother, Janome, Jones, Newhome, Elna, Toyota, Silver, Riccar, Fister Rossman
    To fit Models: Most other sewing machines where you can see the motor unit and bolts on under the hand wheel.
    Price: £ 45.00
    -->







    Something to note... you can have power from a source that reads correctly but if there is just one little piece of wire that is conducting that power when any load is introduced can not carry enough amperage for the demand and in your case the motor will stop working. I suspect you have this situation with your machine. There is a pratially broken wire either from the power cord... inside the foot pedal or on the wire from the foot pedal to the motor. If you good with a meter you can connect a set of "tap" leads from the meter to the cord while you initially start running the motor (load testing) and watch for the voltage loss. If the voltage drops off you know you have cord / pedal wiring problem



    You can get just the foot pedal at 50 percent of the cost above. (fror me not a good choice)



    If you can not perform or have someone do the load voltage tests described above with wire taps, I would purchase and replace all items in the kit above and save myself the agony later.

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  • Expert
  • 290 Answers

I am not familiar with machine but, from your descriptionm your problem could be either due to a faulty power supply or a slipping belt, if there is one. If not the control board could be faulty,
Hope these help, sorry I do not have access to a manual for this machine.

Posted on Feb 07, 2010

  • Kiri Amarakoon Feb 07, 2010

    I doubt it is the battery, as you say that is probaly to keep the memory alive.



    There would be another power supply that needs power from the wall to power the drive motor and the control electronics, it could be that or the motor or other drive mechnism parts.



    If you hear a hum as if the motor is trying to run, it could well be a jammed up or part with dried up lublricant specially if it was sitting idle in a warm cupboard.

  • Kiri Amarakoon Feb 08, 2010

    You are very welcome, one more comment, that may or may not help.



    Generally speaking if the brushes are bad in a DC motor, once you get it going it will keep going and cannot handle the load, but I could be wrong. It is also possible that you may have a brushless motor depending on the age and sophistication of the machine . If that is the case I would suspect the control board. It may just be a bad connection to the motor or the power supply from the control board. Your coment about no resonse to the buttons also points to a control problem.



    Also your comment about the position of the needle affecting the running makes me think that motor cannot handle the load when the needle is down, may be some clue there.

    Good luck.

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The pfaff models with computers have batteries that need to be replaced. After sitting, they probably just wore down. Look on the bottom of your machine. There is a little door you can open to change the 2 AA batteries. This is the easiest thing to try first.

Posted on Feb 07, 2010

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