Treadmill control board help

Discussion in 'General Electronics Chat' started by mikeraphone, Mar 7, 2015.

  1. mikeraphone

    Thread Starter New Member

    Mar 7, 2015
    4
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    IMG_20150307_140842_783.jpg IMG_20150307_162126_262.jpg IMG_20150307_172426_930.jpg IMG_20150307_162228_046.jpg IMG_20150307_162437_582.jpg IMG_20150307_172447_593.jpg IMG_20150307_152057_386.jpg
    Thanks in advance for any help or suggestions.

    I am an auto tech by trade and so have replaced a lot of electronic parts and some basic pcb solder repairs but a noob when it comes to electronics repair.

    I have an Alliance 880hr treadmill which is a Keys model EC880
    I have diagnosed the problem to be in the control board ... specifically the power supply to the DC motor.
    I have posted pics and pointed to a chip on the back of the board that seems to be damaged 'a chip with a chip'
    I don't know if this could be the problem or if and how to check this or other parts.

    Replacing the control board with something that will give me just the basics ...adjustable speed motor would also be an option.....I don't care about the elevation motor or the other bells and whistles. IMG_20150307_140842_783.jpg IMG_20150307_162126_262.jpg IMG_20150307_172426_930.jpg IMG_20150307_162228_046.jpg IMG_20150307_162437_582.jpg IMG_20150307_172447_593.jpg IMG_20150307_162126_262.jpg
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,969
    744
    looking at the pcb, the chip that has blown is a surface mount type, its possible the psu is at fault,there is another chip next to it, can you take closer pictures of them.
     
  3. mikeraphone

    Thread Starter New Member

    Mar 7, 2015
    4
    1
    Thanks Dodgydave
    Let me know if this pic shows what you wanted to see IMG_20150307_211442_266.jpg
     
    Dodgydave likes this.
  4. mikeraphone

    Thread Starter New Member

    Mar 7, 2015
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  5. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,505
    2,367
    Any of the DC motor controllers on ebay such as made by KB & Baldor would work, the problem comes if the original has a motor tach feedback to the board?
    Also the speed control input on many TM's is PWM control and the ones on ebay are mostly 0-10vdc analogue.
    I have Keys TM and the motor has a optical tach.
    Max.
     
  6. mikeraphone

    Thread Starter New Member

    Mar 7, 2015
    4
    1
    Thanks Max
    My motor also has the optical feedback but I thought I would eliminate the board completely and just use the DC motor controller. Would you see any issues with that.....also is there a specific DC controller you would recommend for this.?
    Thanks, Mike
     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,505
    2,367
    The problem going without the tach feedback with this application will be the lack of consistent rpm control WRT load.
    The KB series offer SCR bridge and PWM types with the PWM being quieter and smoother control, you can get an idea of the models from the KB web site, they frequently come up on ebay.
    Max.
     
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