Horizon T-20 treadmill

Discussion in 'The Projects Forum' started by elrese, Oct 13, 2012.

  1. elrese

    Thread Starter New Member

    Aug 3, 2012
    2
    0
    Hi,
    I have a Horizon T-20 treadmill, it powers up but the motor has stopped turning. This had happened to me a couple of years ago and I found D6 to be shorted, i replaced it and that fixed the problem but I noticed the that diode was running hot, so I mounted the diode on the frame of the treadmill to act as a big heatsink, that worked for over a year with no problems. Recently D6 was shorted again and the motor was not turning, I replaced D6 again and that did not fix the problem, I checked Q5, IRFP250, its not shorted, I also checked Q2, FET, that reads around 40 ohms, I suspect that is shorted, also checked all the diodes, resistors and transistors they all read good. What I like to know if any one has some input on this controller board as to the direction I should be going or has a schematic that I may borrow. I have read all the threads pertaining to Horizon treadmills but his one has me pulling my hairs, the few that I have.
    [​IMG]
     
  2. elrese

    Thread Starter New Member

    Aug 3, 2012
    2
    0
    Can anyone on this forum have any ideas or schematic on this controller board? It would be a big help.
    Thank you.
     
  3. micpat

    New Member

    Sep 6, 2014
    3
    0
    I have the exact same board and situation. Pardon my beginner questions but with my OHM tester the q2 shows zero ohms no matter which way I test it. This is a nice challenge and hope my questions do not discourage help. Thanks
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,553
    2,375
    Remove it and test with the resistance range, if shows shorted, it probably is.
    Appears to be a Mosfet.
    Max.
     
  5. micpat

    New Member

    Sep 6, 2014
    3
    0
    Max, Thanks for the help and excuse me for my ignorance in this matter. So I should remove the q2 (s6025l) and check for the resistance range. Which in OHMS should be? Where can I find the range? Thanks so much. And is must be moved so to provide a real test, correct.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,553
    2,375
    It is more conclusive to remove the before checking.
    Check on the low ohm range.
    S6025 is an SCR, just that Q5 appears to be a Mosfet and unusual for a controller to mix the two?
    Max.
     
  7. micpat

    New Member

    Sep 6, 2014
    3
    0
    Max, I removed the Q6 MOSPEC u15A60 no reading on the OHM meter. cut the Q5 and no mater which of the three prongs I paired the OHM meter with they went to zero. So I need to replace both parts?

    Thanks for engaging me in this...
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,553
    2,375
    Last edited: Sep 8, 2014
  9. IamJatinah

    Member

    Oct 22, 2014
    70
    14
    Whoa folks....is this the famed Horizon SJED08011DG or Horizon Part Number 013674DG ? If so, there are a couple of other parts to check when repairing these animals. Repost if things didn't work out, with a pic or part number ;o)
     
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