Question about Janome Sewing Machines

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MC 7000 Er 3 (Dealer suggested; M/B, Fuse, or Servo issue) assumed the code 3 means that Servo/Sensor 3 is at issue (zig-zag control) Servo 3 (Blue connector) appears to be the same ohm check as Servo 2 (Black connector) (array test , pin1 -2, 1-3, 1-4 ... 2-3, 2-4 ....) Servo 3 sensor led has 1 Volt with Diode tester which matches Servo 2 sensor (sensors are clean and typically only fail if the sending led is blown) Mother board Servo controllers all have the same readings to ground on all pins with no overheating indicators P/S Fuses all check out ... now suspecting that there may be a P/S issue ... does anyone have the voltage levels that should be on the P/S cable to the motherboard?

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  • bxdobs Jul 27, 2009

    Totally disassembled the machine and found a transistor on the Power Supply board that had overheatted and basically pulled the solder pads off the board as well as disconnect itself from the circuit. I have repaired the Power supply and partially reverse engineered it. Suspect the Failure may have damaged the Mother board as this fix still hasn't cleared the Error code

    15 pin Power Supply connector:

    1) Sensor Left

    2) Sensor Middle

    3) Sensor Right (wheel)

    4) Analog 120 Hz (40 Volt Full Wave Bridge output)

    5-6) 24.2 V (from Emitter of TR1 ... Base is 24.2 V from Zener ... Collector is Filtered 40 Volt)

    7-8) Analog GND (split from Digital GND on the Motherboard)

    9-10) Digital GND (split from Analog GND on Mother board)

    11-12) 5 V (from P/S Regulator)

    13) Main Motor Control (input)

    14-15) 40 V (Filtered supply used for Servo controllers)

    There is a 10 pin encapsulated device on the mother board where the output of this transistor is connected to so wondering if there is some logic inside this that is testing the Power supply ... if the supply is out of spec perhaps this device is causing the error?

  • bxdobs Aug 05, 2009

    Janome has confirmed the boards for this machine are no longer available as it is too old plus have no technical information on this machine. I am certain I can fix this issue all I need is confirmation of the Transformer Secondary Voltage OR the Servo Voltage pins 14-15 of the Power Supply Board. I am reading + 40 Volts but thinking this may be High ... expecting a voltage somewhere between 25-40 Volts. If the transformer primary windings started shorting that would bump the secondary voltage and explain the Transistor failure from overheating due to having to drop more voltage. Its a long shot but if the question goes unanswered and the voltage is too high there is the potential to damage the servo controllers and or the servo's.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Husqvarna 2000 sl no zig zag movement

You might try oiling where the needlebar slides side to side (and everywhere else). More than likely it needs to be freed up somewhere.  Also there is a small piece called the cam follower that can pop off. Look inside near the cams and the piece with a finger that follows the cams may need to be reattached. They do come loose sometimes. Good luck.

Posted on Oct 18, 2007

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bargainbox
  • 1388 Answers

SOURCE: Elna Carina Zig'Zag Stitch Issue

Over time, and especially when not used, there is a likelihood of dust and old oil forming a sort of glue, or clag....

Remove the needle for safety, then, when you have the setting on Zig zag, gently push the needle arm to the opposite side of the zig stitch.......release the needle arm, and if it springs back quickly, it is fine, if it moves slowly, or almost not at all, then the clag needs removing with application of few drops of methylated spirit to start, at the sort of piston affair that shifts needle arm L & R .....move the needle arm back & forth until it frees up, a drop of oil to finish.........if almost seized, may require leaving overnight after using a penetrating lubricant if it is really resistant....I have had them on the bench for 3 days with manual manipulation a few times each day before they finally come good.

Bargain Box

Posted on Feb 01, 2008

  • 1 Answer

SOURCE: Kenmore 1560 Sewing Machine

Be sure TOP control shows zig-zag. Flip top right bar from red to black or black to red on side of machine facing you. You can then change the widths by changing the numbers on that same circle control.

Posted on Jul 17, 2008

RickE1
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SOURCE: Zig Zag Not working on my Bernina 830.

Basically it is a matter of a stuck part. Flip open the top by prying up on the front or ends of the lid. You already noticed the hinges on the back. When you get it open, exercise the right hand lever on top (marked ZZ at bottom and 1-20 at top. If you look just to the right of this lever against the back wall you will see that it moves a little part back and forth into triangle shaped grooves. The part is not going completely into the grooves so drop some oil in there and exercise it a few more times, using your fingers if necessary to make the part move into the triangle grooves at the front and back. After a while it will loosen up where it should operate by itself smoothly . Hope this helps.

Posted on Dec 12, 2008

  • 1 Answer

SOURCE: Zig Zag Stitch not working

THis problem occurred as I was sewing on Neoprene. I was using Gutterman all-purpose thread and a size 80 needle. Tried switching to a size 70, then to size 90. Still unable to zig zag. After inserting a test sample of cotton, the zig zag worked perfectly, so I knew it was not a mecahnical problem. I switched needles again. This time to size 90 for stretch fabric. Voila! Problem solved.

Posted on May 24, 2009

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